太阳能发电外文翻译文献
太阳能相关英文文献翻译
Solar Tracker for Solar Water Heater AbstractThe Solar Tracker team was formed in the fall of 2005 from five students in an ME design team, and a Smart House liaison. We continued the work of a previous solar tracker group. The task was to design a prototype tracking device to align solar panels optimally to the sun as it moves over the course of the day. The implementation of such a system dramatically increases the efficiency of solar panels used to power the Smart House. This report examines the process of designing and constructing the prototype, the experiences and problems encountered, and suggestions for continuing the project. 1.IntroductionSolar tracking is the process of varying the angle of solar panels and collectors to take advantage of the full amount of the sun’s energy. This is done by rotating panels to be perpendicular to the sun’s angle of incidence. Initial tests in industry suggest that this process can increase the efficiency of a solar power system by up to 50%. Given those gains, it is an attractive way to enhance an existing solar power system. The goal is to build a rig that will accomplish the solar tracking and realize the maximum increase in efficiency. The ultimate goal is that the project will be cost effective – that is, the gains received by increased efficiency will more than offset the one time cost of developing the rig over time. In addition to the functional goals, the Smart House set forth the other following goals for our project: it must not draw external power (self-sustaining), it must be aesthetically pleasing, and it must be weatherproof.The design of our solar tracker consists of three components: the frame, the sensor, and the drive system. Each was carefully reviewed and tested, instituting changes and improvements along the design process. The frame forthe tracker is an aluminum prismatic frame supplied by the previous solar tracking group. It utilizes an ‘A-frame’ design with the rotating axle in the middle. Attached to the bottom of this square channel axle is the platform which will house the main solar collecting panels. The frame itself is at an angle to direct the panels toward the sun (along with the inclination of the roof). Its rotation tracks the sun from east to west during the day.The sensor design for the system uses two small solar panels that lie on the same plane as the collecting panels. These sensor panels have mirrors vertically attached between them so that, unless the mirror faces do not receive any sun, they are shading one of the panels, while the other is receiving full sunlight. Our sensor relies on this difference in light, which results in a large impedance difference across the panels, to drive the motor in the proper direction until again, the mirrors are not seeing any sunlight, at which point both solar panels on the sensor receive equal sunlight and no power difference is seen.After evaluation of the previous direct drive system for the tracker, we designed a belt system that would be easier to maintain in the case of a failure. On one end of the frame is a motor that has the drive pulley attached to its output shaft. The motor rotates the drive belt which then rotates the pulley on the axle. This system is simple and easily disassembled. It is easy to interchange motors as needed for further testing and also allows for optimization of the final gear ratio for response of the tracker.As with any design process there were several setbacks to our progress. The first and foremost was inclement weather which denied us of valuable testing time. Despite the setbacks, we believe this design and prototype to be a very valuable proof-of-principle. During our testing we have eliminated many of the repetitive problems with the motorand wiring so that future work on the project will go more smoothly. We also have achieved our goal of tracking the sun in a ‘hands-off’demo. We were able to have the tracker rotate under its own power to the angle of the sun and stop without any assistance. This was the main goal set forth to us by the Smart House so we believe our sensed motion prototype for solar tracking will be the foundation as they move forward in the future development and implementation of this technology to the house.2. Defining the ProblemThe project was to complete the “REV 2” design phase of the solar tracker to be used on the Smart House. While the team was comprised of members from the ME160 senior design course, the customer for this project was to be the Smart House organization. Jeff Schwane, a representative from the Smart House, was our liaison and communicated to our group the direction Smart House leadership wished us to proceed.At our first meeting with Jeff and Tom Rose, the following needs were identified:1.Track the sun during the daye no external power source3.Weather proof4.Cost effective power gain5.Must look good6.Solar panel versatile i.e. can fit different types ofpanelsWith these needs in hand, we constructed a Quality Function Deployment chart. This chart can be found in Appendix A. The QFD showed the major areas of concern might have been: number of panels/size of panels, internal power requirements, motor torque required.At our first meeting we were also able to set up our goals for the semester. Having a working prototype capable oftracking the sun was to be the main goal for the end of the semester, but we soon found that in order to accomplish this, we would be forced to omit portions of the design criteria in hopes they would be worked out later. This would result in the optimization of platform space on the roof to be irrelevant, with our goal being to have one platform track. It also led to the assumption that our base would not need to be tested for stability or required to be fastened to the roof. With an idea of where we were to begin, from scratch with the possibility of using the frame from the “REV 1” design, and an idea of where we were to finish, with a moving prototype, we constructed the Gantt chart that can be found in Appendix B. Our group planned to meet with Jeff once a week to make sure we were on track with the needs of the Smart House. Jeff would also meet with Tom Rose, the director of Smart House, at least once a week in order to keep everyone on the same page. With our goals in mind we embarked on the process of idea generation.3. Concepts and Research3.1 Tracking TypeOur group used a brainstorming approach to concept generation. We thought of ideas for different solar tracking devices, which proved difficult at times due to the existing frame and concept presented to us by Smart House. Other concepts were generated through research of pre-existing solar tracking devices. Originally our concept generation was geared towards creating a completely new solar tracker outside of the constraints of the previous structure given to us by Smart House. This initial brainstorming generated many concepts. The first one was a uni-axial tracking system that would track the sun east to west across the sky during the course of a day and return at the end of the day. This concept presented the advantage of simplicity and presented us with the option to use materials from the previous structure (whichwas also intended to be a uni-axial tracker) in construction. Another more complex concept was to track the sun bi-axially which would involve tracking the sun both east to west and throughout the seasons. The advantage of this concept was a more efficient harvesting of solar energy. The third concept was to only track throughout the seasons. This would provide small efficiency gains but nowhere near the gain provided by tracking east to west.The different structures we came up with to accomplish tracking motion included a rotating center axle with attached panels, hydraulic or motorized lifts which would move the main panel in the direction of the sun, and a robotic arm which would turn to face the sun. The clear efficiency gains coupled with the simplicity of design of the uni-axial tracking system and the existence of usable parts (i.e. motor and axle) for the rotating center axle structure, led us to the choice of the East to West tracking, rotating center axle concept.3.2 StructureOnce the method of motion was chosen, it was necessary to generate concepts for the structural support of the axle. Support could be provided by the triangular prismatic structure which was attempted by the previous Smart House solar tracker group or through the use of columns which would support the axis on either side. While the prismatic structure presented the advantage of mobility and an existing frame, the columns would have provided us with ease of construction, simple geometric considerations, and ease of prospective mounting on the roof. Due to the heightened intensity of time considerations, the previous financial commitment to the prismatic structure by Smart House, and our limited budget, the presence of the pre-existing frame proved to be the most important factor in deciding on a structure. Due to these factors we decided to work within the frame which was provided to us from the previous SolarTracker group.3.2 Tracking MotionOnce the structural support was finalized we needed to decide on a means to actualize this motion. We decided between sensed motion, which would sense the sun’s position and move to follow it, and continuous clock type motion, which would track the sun based on its pre-determined position in the sky. We chose the concept of continuous motion based on its perceived accuracy and the existence of known timing technology. During the evaluation stage, however, we realized that continuous motion would prove difficult. One reason was the inability to draw constant voltage and current from the solar panels necessary to sustain consistent motion, resulting in the necessity for sensing the rotation position to compensate. Continuous motion also required nearly constant power throughout the day, which would require a mechanism to store power. Aside from these considerations, the implementation of a timing circuit and location sensing device seemed daunting. After consulting Dr. Rhett George, we decided on a device using two panels and shading for sensed motion.4. Analysis and Embodiment4.1 Structure GeometryThe geometry of the frame was created in order to allow the solar panels to absorb light efficiently. This was done by allowing rotation in the east-west direction for tracking the sun daily and a 36° inclination (Durham’s latitude) towards the south. Because this frame was designed to be placed on a roof with a slope of 25°, the actual incline of the frame was made to be 11°.The geometry of the existing platform structure was modified. This was done in order to incorporate the results from the Clear Day Model supplied to us by Dr. Knight. This model led to the conclusion that the platform should track toup to 60°in both directions of horizontal. Thus, the angle range of the frame had to be increased. The sides of the frame were brought in to increase the allowable angle of rotation, and they were brought in proportionally to maintain the inclination angle of 11°. Also, crosspieces were moved to the inside of the frame to allow greater rotation of the platform before it came into contact with the support structure.The panels used for sensing and powering rotation were placed on the plane of the platform. Mirrors were placed perpendicular to and in between the panels to shade one and amplify the other in order to produce a difference to power the motor. The sensing panels were placed outside the platform area to maintain the largest area possible for collecting panels. A third sensing panel was mounted nearly vertical and facing east to aid rotation back towards the sun in the morning. This panel was attached to the frame under the platform, so that during most of the day, it’s shaded with minimal effects on sensed rotation.Minimizing the torques on the motor was a main concern in order to minimize the motor power needed. The platform designed for the placement of the collecting solar panels was placed under the rotational shaft so that the panels would be aligned with it the rotational axis. Since the main panels comprise the majority of the weight putting these in the plane of the rotational axis reduces torque on the shaft. The sensing panels were placed symmetrically about the axis of rotation in order to prevent additional torque on the motor. The third panel was attached to the frame instead of the platform or rotational shaft so as to also avoid any torque.4.2 MaterialsMaterials selection for most of the frame was simple because it had already been constructed. The mirrors used for the amplification and shading of the sensing panels were also already purchased and available for use. Additional parts forattachment of the panels and mirrors to the frame were taken from the scrap pieces available in the machine shop. In our selection of sensing panels, size and power needed to be balanced effectively. The panels were to be as small as possible in order to add minimal stress and weight to the frame but also needed to be powerful enough to power the rotation of the platform. Therefore, the most powerful of the intermediate sized panels available were selected. The panels purchased also appeared to be the most reliable of our options.4.3 Drive MechanismAfter designing a prototype and testing it, the motor purchased and used by the previous solar tracker group was slipping. It was removed, and the installation of a gear system with another simple motor was suggested and attempted. Professor Knight supplied some gears as well as some belts and pulleys. One end of the shaft was lathed so that one of the pulleys could be set on it, and spacers were bought so that a 6V motor we had available could power another pulley. These pulleys were to be connected by a belt. This motor demonstrated insufficient strength to turn the rotational shaft. The original motor, once detached, was taken apart and examined. Itappeared to be working again so a new pulley was purchased to fit it and was attached in the place of the 6V motor.5. Detailed Design5.1 FrameThe frame was designed from one inch square aluminum tubing, and a five foot long, two inch square tube for the axle. It is constructed with a rigid base and triangular prismatic frame with side supporting bars that provide stability. The end of the axle is attached to a system of pulleys which are driven by the motor. It is easily transported by removing the sides of the base and folding the structure.5.2 SensorOur sensing panels are bolted to the bottom of the main solar panel frame and braced underneath with half inch L-brackets. The mirrors are attached to the inside of the sensing panels and braced by L-brackets as well. The whole structure attaches easily to the main panel frame which is attached to the main axle using four 2-inch U-bolts. A third panel is bolted to the structure to return the main panels direction towards the horizon of sunrise.5.3 How the Sensor WorksOur sensor creates movement of the motor by shading one of the panels and amplifying the other when the system is not directly facing the sun. The two sensing panels are mounted parallel to the main panels symmetrically about the center axle with two mirrors in between them. The shading on one of the panels creates high impedance, while the amplified panel powers the motor. This happens until the panels receive the same amount of sunlight and balance each other out (i.e. when the sensing panels and main panels are facing the sun.). We initially attempted using a series configuration to take advantage of the voltage difference when one of the panels was shaded (Appendix C). This difference, however, was not large enough to drive the motor. We subsequently attempted a parallel configuration which would take advantage of the impedance of the shaded panel (Appendix C) and provide the current needed to drive the motor. Once the sensing mechanism has rotated from sunrise to sunset, the third panel, which is usually shaded, uses sunlight from the sunrise of the next day to power the motor to return the panels towards the direction of the sun.6. Prototype TestingInitial testing was done using just the sensing component and a 6V motor. The panels were tilted by hand to create shading and amplification. A series configuration of the sensing panels was initially tested and proved ineffective. Dataacquisition showed a maximum of a 2V difference across the motor, which was insufficient to power it. Upon testing the panels individually, it was discovered that the open voltage across each individual panel would only vary between 21.5V and 19.5V when fully amplified and fully shaded, respectively. The current running through each panel, however, was seen to fluctuate between nearly 0 amps when shaded, up to 0.65 amps when fully amplified. Therefore, in order to take advantage of the increase in impedance of the solar panels due to shading, we chose to put our sensing panels in parallel with each other and the motor. Tests with this configuration turned the motor in one direction, stopped when the sensing panels were nearly perpendicular to the sun, and reversed direction as the panels rotated past perpendicular. We found the angle range necessary to stop the motor to be very small. It was also observed that the panels rotated to slightly past perpendicular when they ceased motion. This error may be due to a difference in the innate resistance in each individual sensing panel. When tested it was found that one panel had a resistance of 52 kΩ, and the other panel resistance was 53 kΩ. Other testing found the voltage and current provided by the sensing solar panels to the motor to be consistent at all points, excluding when the solar panels are directly facing the sun. Through testing it was concluded that resistance may need to be added to one of the panels to compensate for the differences in the internal resistances of the individual panels, and a voltage regulator needs to be added to decrease the voltage seen across the motor. The original motor was prone to failure as its slippage caused the breakdown of our initial prototype after testing. This led to the institution of the pulley and belt driven system which would allow for easier maintenance given motor failure or slippage. The success of our initial testing and prototype proved to us the efficacy of our solar tracker design.7. ConclusionThroughout this project we enlisted the support of multiple resources (i.e. ME and EE professors, previous Smart House teams). We learned early on that a clear problem definition was essential to efficient design and progress. We struggled initially as we tried to design a tracking device that was different from the previous solar tracker group’s attempt, without fully weighing the size of their investment and the advantages of using the existing frame for our purposes. As we worked with the fixed frame construction from the previous group we learned that variability of design is key, especially when in the initial phases of prototyping. After many setbacks in testing of the solar panels, we learned that when working with solar panels, much time needs to be set aside for testing due to the unpredictability of the weather.The actual implementation of using the prototype in its intended location on the Smart House roof requires weather-proofing to protect the wiring and electrical connections from the elements, housing for the motor, a bracing system to attach the structure to the roof, and possible redesign to eliminate excess height and simplify overall geometry. The efficiency of the sensor system could be improved by widening the mirrors or by placing blinders along the sides of the panels to decrease the effects of reflected and refracted light incident on the shaded sensing panel.适用于太阳能热水器的太阳能跟踪器摘要太阳能跟踪器设计团队成立于2005年秋季，设计团队由五名队员组成，我们还负责与智能家居的联络工作。
光伏发电中英对照文献
外文参考文献译文及原文目录外文文献译文 (1)1.中国光伏发电的战略地位 (1)2.世界光伏产业现状和发展预测 (2)3.中国光伏发电市场和产业现状 (3)4.中国光复发电的市场预测和规划建议 (5)5.结论 (6)外文文献原文 (7)1.China's strategic position PV (7)2.The world's current situation and development of photovoltaic industryforecast (9)3.The Chinese PV market and industry statu s (10)4.China's PV market forecasting and planning proposals (13)5.Conclusions (15)外文文献译文1、中国光伏发电的战略地位1.1 中国的能源资源和可再生能源现状和预测；无论从世界还是从中国来看，常规能源都是很有限的，中国的一次能源储量远远低于世界的平均水平，大约只有世界总储量的10％。
从长远来看，可再生能源将是未来人类的主要能源来源，因此世界上多数发达国家和部分发展中国家都十分重视可再生能源对未来能源供应的重要作用。
在新的可再生能源中，光伏发电和风力发电是发展最快的,世界各国都把太阳能光伏发电的商业化开发和利用作为重要的发展方向。
根据欧洲JRC 的预测，到2030年太阳能发电将在世界电力的供应中显现其重要作用，达到10%以上，可再生能源在总能源结构中占到30％；2050 年太阳能发电将占总能耗的20%，可再生能源占到50％以上，到本世纪末太阳能发电将在能源结构中起到主导作用。
我国政府重视可再生能源技术的发展，主要有水能、风能、生物质能、太阳能、地热能和海洋能等。
我国目前可再生能源的发展现状如下：水能：我国经济可开发的水能资源量为3.9 亿千瓦，年发电量1.7 万亿千瓦时，其中5 万千瓦及以下的小水电资源量为1.25 亿千瓦。
太阳能发电英文
Solar energySolar energy, radiant light and heat from the sun, has been harnessed by humans since ancient times using a range of ever-evolving technologies. Solar radiation, along with secondary solar-powered resources such as wind and wave power, hydroelectricity and biomass, account for most of the available renewable energy on earth. Only a minuscule fraction of the available solar energy is used.Solar powerSolar power is the generation of electricity from sunlight. This can be direct as with photovoltaics (PV), or indirect as with concentrating solar power (CSP), where the sun's energy is focused to boil water which is then used to provide power. Solar power has the potential to provide over 1,000 times total world energy consumption in 2008, though it provided only 0.02% of the total that year. If it continues to double in use every two to three years, or less, it would become the dominant energy source this century. The largest solar power plants, like the 354 MW SEGS, are concentrating solar thermal plants, but recently multi-megawatt photovoltaic plants have been built. Completed in 2008, the 46 MW Moura photovoltaic power station in Portugal and the 40 MW Waldpolenz Solar Park in Germany are characteristic of the trend toward larger photovoltaic power stations.Much larger ones are proposed, such as the 100 MW Fort Peck Solar Farm, the 550 MW Topaz Solar Farm, and the 600 MW Rancho Cielo Solar Farm.Solar power is amazing. On average, every square meter of Earth's surface receives 164 watts of solar energy. In other words, you could stand a really powerful (150 watt) table lamp on every square meter of Earth's surface and light up the whole planet with the Sun's energy! Or, to put it another way, if we covered just one percent of the Sahara desert with solar panels, we could generate enough electricity to power the whole world. That's the good thing about solar power: there's an awful lot of it—much more than we could ever use.But there's a downside too. The energy the Sun sends out arrives on Earth as a mixture of light and heat. Both of these are incredibly important—the light makes plants grow, providing us with food, while the heat keeps us warm enough to survive—but we can't use either the Sun's light or heat directly to run a television or a car. We have to find some way of converting solar energy into other forms of energy we can use more easily, such as electricity. And that's exactly what solar panels do.Solar cellA solar cell is a device that converts the energy of sunlight directly into electricity by the photovoltaic effect. Sometimes the term solar cell is reserved for devices intended specifically to capture energy from sunlight such as solar panels and solar cells, while the term photovoltaic cell is used when the light source is unspecified. Assemblies of cells are used to make solar panels, solar modules, or photovoltaic arrays. Photovoltaics is the field of technology andresearch related to the application of solar cells in producing electricity for practical use. The energy generated this way is an example of solar energy.History of solar cellsThe development of the solar cell stems from the work of the French physicist Antoine-César Becquerel in 1839. Becquerel discovered the photovoltaic effect while experimenting with a solid electrode in an electrolyte solution; he observed that voltage developed when light fell upon the electrode. About 50 years later, Charles Fritts constructed the first true solar cells using junctions formed by coating the semiconductor selenium with an ultrathin, nearly transparent layer of gold. Fritts's devices were very inefficient, transforming less than 1 percent of the absorbed light into electrical energy.By 1927 another metalÐsemiconductor-junction solar cell, in this case made of copper and the semiconductor copper oxide, had been demonstrated. By the 1930s both the selenium cell and the copper oxide cell were being employed in light-sensitive devices, such as photometers, for use in photography. These early solar cells, however, still had energy-conversion efficiencies of less than 1 percent. This impasse was finally overcome with the development of the silicon solar cell by Russell Ohl in 1941. In 1954, three other American researchers, G.L. Pearson, Daryl Chapin, and Calvin Fuller, demonstrated a silicon solar cell capable of a 6-percent energy-conversion efficiency when used in direct sunlight. By the late 1980s silicon cells, as well as those made of gallium arsenide, with efficiencies of more than 20 percent had been fabricated. In 1989 a concentrator solar cell, a type of device in which sunlight is concentrated onto the cell surface by means of lenses, achieved an efficiency of 37 percent due to the increased intensity of the collected energy. In general, solar cells of widely varying efficiencies and cost are now available.StructureModern solar cells are based on semiconductor physics -- they are basically just P-N junction photodiodes with a very large light-sensitive area. The photovoltaic effect, which causes the cell toconvert light directly into electrical energy, occurs in the three energy-conversion layers.The first of these three layers necessary for energy conversion in a solar cell is the top junction layer (made of N-type semiconductor ). The next layer in the structure is the core of the device; this is the absorber layer (the P-N junction). The last of the energy-conversion layers is the back junction layer (made of P-type semiconductor).As may be seen in the above diagram, there are two additional layers that must be present in a solar cell. These are the electrical contact layers. There must obviously be two such layers to allow electric current to flow out of and into the cell. The electrical contact layer on the face of the cell where light enters is generally present in some grid pattern and is composed of a good conductor such as a metal. The grid pattern does not cover the entire face of the cell since grid materials, though good electrical conductors, are generally not transparent to light. Hence, the grid pattern must be widely spaced toallow light to enter the solar cell but not to the extent that the electrical contact layer will have difficulty collecting the current produced by the cell. The back electrical contact layer has no such diametrically opposed restrictions. It need simply function as an electrical contact and thus covers the entire back surface of the cell structure. Because the back layer must be a very good electrical conductor, it is always made of metal.How do solar cells workA solar cell is a sandwich of n-type silicon (blue) and p-type silicon (red).1.When sunlight shines on the cell, photons (light particles)bombard the upper surface.2.The photons (yellow blobs) carry their energy down through thecell.3.The photons give up their energy to electrons (green blobs) inthe lower, p-type layer.4.The electrons use this energy to jump across the barrier into theupper, n-type layer and escape out into the circuit.5.Flowing around the circuit, the electrons make the lamp lightup.Solar Power - Advantages and Disadvantages Solar Power AdvantagesThere are many advantages of solar energy. Just consider the advantages of solar energy over that of oil:· Solar energy is a renewable resource. Although we cannot utilize the power of the sun at night or on stormy, cloudy days, etc., we can count on the sun being there the next day, ready to give us more energy and light. As long as we have the sun, we can have solar energy (and on the day that we no longer have the sun, you can believe that we will no longer have ourselves, either).· Oil, on the other hand, is not renewable. Once it is gone, it is gone. Yes, we may find another source to tap, but that source may run out, as well.· Solar cells are totally silent. They can extract energy from the sun without making a peep. Now imagine the noise that the giant machines used to drill for and pump oil make!· Solar energy is non-polluting. Of all advantages of solar energy over that of oil, this is, perhaps, the most important. The burning of oil releases carbon dioxide and other greenhouse gases and carcinogens into the air.·Solar cells require very little maintenance (they have no moving parts that will need to be fixed), and they last a long time.· Although solar panels or solar lights, etc., may be expensive to buy at the onset, you can save money in the long run. After all, you do not have to pay for energy from the sun. On the other hand, all of us are aware of the rising cost of oil.· Solar powered lights and other solar powered products are also very easy to install. You do not even need to worry about wires.Here are the disadvantages of solar energy:•The initial cost is the main disadvantage of installing a solar energy system, largely because of the high cost of thesemi-conducting materials used in building one.•The cost of solar energy is also high compared tonon-renewable utility-supplied electricity. As energy shortages are becoming more common, solar energy is becoming moreprice-competitive.•Solar panels require quite a large area for installation to achievea good level of efficiency.•The efficiency of the system also relies on the location of the sun, although this problem can be overcome with the installation of certain components.•The production of solar energy is influenced by the presence of clouds or pollution in the air.•Similarly, no solar energy will be produced during nighttime although a battery backup system and/or net metering willsolve this problem.Development, deployment and economicsBeginning with the surge in coal use which accompanied the Industrial Revolution, energy consumption has steadily transitioned from wood and biomass to fossil fuels. The early development of solar technologies starting in the 1860s was driven by an expectation that coal would soon become scarce. However development of solar technologies stagnated in the early 20th century in the face of the increasing availability, economy, and utility of coal and petroleum.The 1973 oil embargo and 1979 energy crisis caused a reorganization of energy policies around the world and brought renewed attention to developing solar technologies.Deployment strategies focused on incentive programs such as the Federal Photovoltaic Utilization Program in the US and the Sunshine Program in Japan. Other efforts included the formation of research facilities in the US (SERI, now NREL), Japan (NEDO), and Germany (Fraunhofer Institute for Solar Energy Systems ISE).Between 1970 and 1983 photovoltaic installations grew rapidly, but falling oil prices in the early 1980s moderated the growth of PV from 1984 to 1996.Photovoltaic production growth has averaged 40% per year since 2000 and installed capacity reached 10.6 GW at the end of 2007,and 14.73 GW in 2008.Since 2006 it has beeneconomical for investors to install photovoltaics for free in return for a long term power purchase agreement. 50% of commercial systems were installed in this manner in 2007 and it is expected that 90% will by 2009. Nellis Air Force Base is receiving photoelectric power for about 2.2 ¢/kWh and grid power for 9 ¢/kWh.Commercial concentrating solar thermal power (CSP) plants were first developed in the 1980s. CSP plants such as SEGS project in the United States have a levelized energy cost (LEC) of 12–14 ¢/kWh.The 11 MW PS10 power tower in Spain, completed in late 2005, is Europe's first commercial CSP system, and a total capacity of 300 MW is expected to be installed in the same area by 2013.In August 2009, First Solar announced plans to build a 2 GW photovoltaic system in Ordos City, Inner Mongolia, China in four phases consisting of 30 MW in 2010, 970 MW in 2014, and another 1000 MW by 2019. As of June 9, 2009, there is a new solar thermal power station being built in the Banaskantha district in North Gujarat. Once completed, it will be the world's largest.。
太阳发电英文作文初中
太阳发电英文作文初中英文回答：Solar power is a renewable source of energy that is generated by the sun's rays. It is a clean and sustainable form of energy that does not produce greenhouse gases. Solar power is generated by photovoltaic (PV) cells, which convert sunlight into electricity. PV cells are made of semiconductor materials, such as silicon, which absorb sunlight and create an electrical current.Solar power is becoming increasingly popular as a source of renewable energy. In 2020, solar power accounted for about 3% of global electricity generation, and this number is expected to grow to 10% by 2030. Solar power is particularly well-suited for use in remote areas, where it can provide electricity to communities that are not connected to the grid.There are many benefits to using solar power. Solarpower is a clean and sustainable source of energy that does not produce greenhouse gases. Solar power is also becoming increasingly cost-effective, as the cost of PV cells has declined in recent years. Solar power is a reliable source of energy, as it can be generated during the day and stored in batteries for use at night.However, there are also some challenges to using solar power. Solar power is intermittent, as it is only available when the sun is shining. Solar power can also be expensive to install, as PV cells are still relatively expensive.Overall, solar power is a promising source of renewable energy that has the potential to play a major role in the future of energy production. Solar power is clean, sustainable, and cost-effective, and it is becoming increasingly popular as a source of renewable energy.中文回答：太阳能是一种可再生能源，由太阳光线产生。
光伏发电系统外文翻译文献
文献信息：文献标题：A New Controller Scheme for Photovoltaics Power Generation Systems（光伏发电系统的一种新的控制方案）国外作者：Tamer T.N.Khatib，Azah Mohamed，Nowshad Amin文献出处：《European Journal of Scientific Research》,2009，Vol.33 No.3, pp515-524字数统计：英文1337单词，7006字符；中文2149汉字外文文献：A New Controller Scheme for Photovoltaics PowerGeneration SystemsAbstract:This paper presents a new controller scheme for photovoltaic (PV) power generation systems. The proposed PV controller scheme controls both the boost converter and the battery charger by using a microcontroller in order to extract maximum power from the PV array and control the charging process of the battery. The objective of the paper is to present a cost effective boost converter design and an improved maximum power point tracking algorithm for the PV system. A MATLAB based simulation model of the proposed standalone PV system has been developed to evaluate the feasibility of the system in ensuring maximum power point operation.1.IntroductionRecently, the installation of PV generation systems is rapidly growing due to concerns related to environment, global warming, energy security, technology improvements and decreasing costs. PV generation system is considered as a clean and environmentally-friendly source of energy. The main applications of PV systems are in either standalone or grid connected configurations. Standalone PV generationsystems are attractive as indispensable electricity source for remote areas. However, PV generation systems have two major problems which are related to low conversion efficiency of about 9 to 12 % especially in low irradiation conditions and the amount of electric power generated by PV arrays varies continuously with weather conditions. Therefore, many research works are done to increase the efficiency of the energy produced from the PV arrays.The solar cell V-I characteristics is nonlinear and varies with irradiation and temperature. But there is a unique point on the V-I and P-V curves, called as the maximum power point (MPP), at which at this point the PV system is said to operate with maximum efficiency and produces its maximum power output. The location of the MPP is not known but can be traced by either through calculation models or search algorithms. Thus, maximum power point tracking (MPPT) techniques are needed to maintain the PV array’s operating point at its MPP. Many MPPT techniques have been proposed in the literature in which the techniques vary in many aspects, including simplicity, convergence speed, hardware implementation and range of effectiveness. However, the most widely used MPPT technique is the perturbation and observation (P&O) method. This paper presents a simple MPPT algorithm which can be easily implemented and adopted for low cost PV applications. The objective of this paper is to design a novel PV controller scheme with improved MPPT method.The proposed standalone PV controller implementation takes into account mathematical model of each component as well as actual component specification. The dc–dc or boost converter is the front-end component connected between the PV array and the load. The conventional boost converter may cause serious reverse recovery problem and increase the rating of all devices. As a result, the conversion efficiency is degraded and the electromagnetic interference problem becomes severe under this situation. To increase the conversion efficiency, many modified step-up converter topologies have been investigated by several researchers. V oltage clamped techniques have been incorporated in the converter design to overcome the severe reverse-recovery problem of the output diodes. In this paper, focus is also given in the boost converter design. Another important component in the standalone PV systemsis the charge controller which is used to save the battery from possible damage due to over-charging and over-discharging. Studies showed that the life time of a battery can be degraded without using a charge controller.The proposed new controller scheme for the standalone PV system controls both the boost converter and the charge controller in two control steps. The first step is to control the boost converter so as to extract the maximum power point of the PV modules. Here, a high step-up converter is considered for the purpose of stepping up the PV voltage and consequently reducing the number of series-connected PV modules and to maintain a constant dc bus voltage. A microcontroller is used for data acquisition that gets PV module operating current and voltage and is also used to program the MPPT algorithm. The controller adopts the pulse width modulation (PWM) technique to increase the duty cycle of the generated pulses as the PV voltage decreases so as to obtain a stable output voltage and current close to the maximum power point. The second control step is to control the charge controller for the purpose of protecting the batteries. By controlling the charging current using the PWM technique and controlling the battery voltage during charging, voltages higher than the gassing voltage can be avoided.2.Design of the Proposed Photovoltaic SystemMost of the standalone PV systems operate in one mode only such that the PV system charges the battery which in turns supply power to the load. In this mode of operation, the life cycle time of the battery may be reduced due to continuous charging and discharging of the battery. The proposed standalone PV system as shown in terms of a block diagram in Figure 1 is designed to operate in two modes: PV system supplies power directly to loads and when the radiation goes down and the produced energy is not enough, the PV system will charge the battery which in turns supply power to the load. To manage these modes of operation, a controller is connected to the boost converter by observing the PV output power.3.MethodologyFor the purpose of estimating the mathematical models developed for the proposed standalone PV system, simulations were carried in terms of the MATLAB codes. Each PV module considered in the simulation has a rating of 80 Watt at 1000 W/m2, 21.2 V open circuit voltage, 5A short circuit current. The PV module is connected to a block of batteries with of sizing 60 Ah, 48 V.4.Results and DiscussionThe simulation results of the standalone PV system using a simple MPPT algorithm and an improved boost converter design are described in this section. Simulations were carried out for the PV system operating above 30o C ambient temperature and under different values of irradiation. Figure 9 shows the PV array I-V characteristic curve at various irradiation values. From the figure, it is observed that the PV current increase linearly as the irradiation value is increased. However, the PV voltage increases in logarithmic pattern as the irradiation increases. Figure 10 shows the PV array I-V characteristic curve at various temperature values. It is noted from the figure that, the PV voltage decreases as the ambient temperature is increased.Figure 4 compares the PV array P-V characteristics obtained from using the proposed MPPT algorithm and the classical MPPT P&O algorithm. From this figure, it can be seen that by using the proposed MPPT algorithm, the operating point of PV array is much closer to the MPP compared to the using the classical P&O algorithm.In addition, the proposed boost converter is able to give a stable output voltage as shown in Figure 5. In terms of PV array current, it can be seen from Figure 6 that the PV current is closer to the MPP current when using the improved MPPT algorithm. Thus, the track operating point is improved by using the proposed MPPT algorithm. In terms of efficiency of the standalone PV system which is calculated by dividing the load power with the maximum power of PV array, it is noted that the efficiency of the system is better with the proposed MPPT algorithm as compared to using the classical P&O algorithm as shown in Figure 7.5.ConclusionThis paper has presented an efficient standalone PV controller by incorporating an improved boost converter design and a new controller scheme which incorporates both a simple MPPT algorithm and a battery charging algorithm. The simulation results show that the PV controller using the simple MPPT algorithm has provided more power and better efficiency (91%) than the classical P&O algorithm. In addition, the proposed boost converter design gives a better converter efficiency of about 93%. Such a PV controller design can provide efficient and stable power supply for remote mobile applications.中文译文：光伏发电系统的一种新的控制方案摘要：本文提出了一种新的光伏（PV）发电系统控制器方案。
用太阳能发电的英语作文
用太阳能发电的英语作文Solar Energy: A Sustainable Solution for Power Generation。
Introduction。
In recent years, the world has witnessed an increasing demand for energy due to population growth and industrial development. As a result, traditional energy sources such as fossil fuels have been heavily relied upon, leading to environmental degradation and concerns about future energy security. In light of these challenges, solar energy has emerged as a promising alternative for power generation. Harnessing the power of the sun, solar energy offers numerous advantages, including sustainability, cost-effectiveness, and environmental friendliness. This essay will delve into the various aspects of solar energy, exploring its benefits, applications, and potential for the future.Harnessing the Power of the Sun。
Solar energy refers to the conversion of sunlight into electricity using photovoltaic (PV) cells or solar thermal collectors. PV cells, made of semiconductor materials, absorb photons from sunlight and convert them into direct current (DC) electricity. This electricity can either be used immediately or stored in batteries for later use. On the other hand, solar thermal collectors utilize the sun's heat to generate steam, which drives turbines to produce electricity.Advantages of Solar Energy。
太阳能发电-中英文翻译Solarelectricalenergygeneration文献翻译
文献翻译英文原文：Solar electrical energy generationAlong with economical development, society's progress, the people to the energy proposed that more and more high request, seeks for the new energy to become the urgent topic which the current humanity faces. The existing energy mainly has 3 kinds, namely thermal power, water and electricity and nuclear power.The thermal power needs to burn fossil fuels and so on bunker coal, petroleum. On the one hand the fossil fuel reserves limited, the fever are less, is facing the danger which dries up. It is estimated that the world oil resource will have 30 years then to dry up again. On the other hand the combustion fuel will discharge CO2 and the sulfur oxide compound, will therefore cause the greenhouse effect and the acid rain, will worsen the terrestrial environment.The water and electricity must submerge the massive lands, has the possibility to cause the ecological environment to destroy, moreover large reservoir, once collapses, the consequence will be inconceivable. Moreover, country's hydro-electric resources are also limited, moreover must receive the season influence.The nuclear power in the normal condition no doubt is clean, but has the nuclear leakage accidentally, the consequence is similarly fearful. The former Soviet Union Chernobyl Nuclear Power Station accident, has caused 9,000,000 people to receive the varying degree harm, moreover this influence has not terminated.These force the people to seek for the new energy. The new energy must simultaneously meet two conditions: First, the implication rich will not dry up; Second, is safe, is clean, will not threaten the humanity and the destruction environment. At present found the new energy mainly had two kinds：first, solar energy; second, fuel cell. Moreover, the wind power generation may also be the auxiliary new energy. And, the most ideal new energy is greatly positive energy.1. The solar electrical energy generation is the most ideal new energyShines is huge on Earth's solar energy, about 40 minutes shine on Earth's solar energy, then sufficiently supplies global humanity one year energy the expense. It can be said that the solar energy is true inexhaustible, the inexhaustible energy. Moreover the solar electrical energy generation is absolutely clean, does not have the environmental damage. Therefore the solar electrical energy generation is honored asis the ideal energy.Obtains the electric power from the solar energy, must carry on the electro-optical transformation through the greatly positive battery to realize. It completely was formerly different with other power source electricity generation principle, has the following characteristic: ①Non-depletion danger; ②Clean (does not have environmental damage) absolutely; ③It is not distributed the resources the region the limit; ④But is using electricity place nearby generates electricity; ⑤The energy quality is high; ⑥The user easy to accept from the sentiment; ⑦The gain energy expenditure's time is short. The deficiency is:①The illumination energy distribution density is small, namely must take the huge area; ②Obtains the energy with four seasons, the day and nights and cloudy clear and so on meteorological conditions concerns. But generally speaking, the flaw does not cover the fine jade, takes the new energy, the solar energy has the enormous merit, therefore receives various countries the value.Must enable the solar electrical energy generation to achieve the practical level truly; first, must raise the solar energy electro-optic conversion efficiency and reduce its cost; second, must realize the solar electrical energy generation with present's electrical network networking.At present, solar panels mainly has the mono-crystalline silicon, the polycrystalline silicon, the amorphous state silicon three kinds. The mono-crystalline silicon solar cell conversion efficiency is highest, has reached above 20%, but the price is also the most expensive. The amorphous state silicon solar cell conversion efficiency is lowest, but the price is the cheapest, from now on most will be hopeful uses in generally generating electricity will be this kind of battery. Once its big area module electro-optic conversion efficiency achieves 10%, each watt generating set price falls to 1-2 US dollars, then sufficiently compete with present's electricity generation way. It is estimated that at the end of this century it may achieve this level.Certainly, in the special use and the laboratory uses the solar cell efficiency must be much higher, if the US Boeing develops by the gallium arsenic semiconductor with the positive electricity place which too the stibium gallium semiconductor overlaps becomes, the electro-optic conversion efficiency may reach 36%, has caught up with the coal-burning electricity generation efficiency quickly. But because it is too expensive, at present can only be restricted on the satellite uses.2. Solar electrical energy generation applicationAlthough solar electrical energy generation day and nights, clear and rain, season influence, but may carry on scattered, therefore it is suitable for various each household minute to carry on the electricity generation severally, moreover must join in the power supply network, causes each family when the electric power is wealthy may sold it to the Electricity company, when the insufficiency be possible from the Electricity company to buy up. Realizes this point’s technology not to be difficult to solve, the key lies in must have the corresponding legal safeguard. Now the US, Japan and so on developed country has made the corresponding law, guaranteed that carries on the solar electrical energy generation the family benefit, encourages the family to carry on the solar electrical energy generation.Japan has realized the solar electrical energy generation system the same electricity company electrical network's networking in April, 1992, had some families to start to install the solar electrical energy generation equipment. The Japanese Ministry of International Trade and Industry started from 1994 take individual housing as an object, implemented to purchases the solar electrical energy generation equipment's expense to subsidize 2/3 systems. Requests the first year had 1000 households families, when 2000 to have 70,000 households families to install the solar electrical energy generation equipment.According to the Japanese Department concerned estimates in the Japanese 21,000,000 households individual housing, if has 80% to install the solar electrical energy generation equipment, then may satisfy 14% which the national total power needs, if units and so on factory and office building also carry on the solar electrical energy generation with the room, then the solar electrical energy generation will occupy the national electric power 30%-40%. The current hindrance solar electrical energy generation popular most primary factor is the expense is expensive In order to satisfy the general family power requirement 3 kilowatt generating system, needs 6,000,000 to 7,000,000 Japanese Yen, has not included the installment wages. The concerned expert believed that when must fall at least to 1,000,000 to 2,000,000 Japanese Yen, the solar electrical energy generation only then can popularize truly. The key to reduce the expense lie in the solar cell to raise the conversion efficiency and to reduce the cost.Some time ago, the US Texas Instruments Company and SCE Corporation announced that they develop one kind of new solar cell, each unit is the diameter less than 1 millimeter bead, they distribute regularly densely and numerously on the softaluminum foil, looks like many silkworm eggs to cling on the paper is the same. Then distributes in about 50 square centimeters area has 1,700 such units. This kind of new battery's characteristic is, although the conversion efficiency has 8%-10%, but the price is cheap. Moreover aluminum foil bottom bush soft solid, may look like the cloth to fold equally at will, and durable, hangs in toward the sun place then may generate electricity, is convenient. It is said that uses this kind of new solar cell, so long as each watt power capacity equipment 1.5 to 2 US dollars, moreover each round of once electricity's expense might also fall to 14 cents about, definitely may compete with the ordinary power plant. Each family hangs this kind of battery on the roof, the wall toward the sun, every year may obtain 1,000-2,000 degrees electric powers.3. Solar electrical energy generation prospectThe solar electrical energy generation has a more exciting plan. First, Japan proposes creates the century plan. Prepares the desert and the sea area carries on the electricity generation using the ground, and through superconducting cable whole world solar power station connection unification electrical network in order to global. According to reckoning, to 2000, in 2050, in 2100, even if all uses the solar electrical energy generation supplies the whole world energy, the occupying land area is also 651,100 square kilometer, 1,867,900 square kilometer, 8,291,900 square kilometers. 8,291,900 square kilometers only occupy the complete sea area 2.3% or the complete desert area 51.4%, even is the Sahara area 91.5%. Therefore this plan has the possibility to realize.Another one is the space electricity generation plan. As early as in 1980 the NASA and Department of Energy proposed that in the spatial construction solar power station tentative plan, prepares on the synchronous orbit to put one long 10 kilometers, to extend 5 kilometer big plates, above covers entirely the solar cell, like this then may provide 5,000,000 kilowatts electric powers. But this needs to solve to the ground wireless electric transmission question. Already proposed with the micro wave beam, the laser beam and so on each kind of plan. At present although has realized the short distance, the short time, the low power microwave wireless electric transmission with the mockup, but to true practical also has the long distance.Along with our country technology's development, in 2006, China had three enterprises to enter global first ten, symbolizes that China will become one of global new energy science and technology central, in the world the solar energy light bends down widespread application, what caused present to be deficient was raw materialsupply and the price rise, we needed dissemination of technology at the same time, to use the new technology, with the aim of reducing the cost large scale, was this new energy long-term development provides the driving force!The solar energy use mainly divides into several aspects: The family with the small solar energy power plant, the large-scale incorporation power plant, the building integration light bends down the glass curtain wall, the solar energy street light, the scenery supplementary street light, the scenery supplementary power supply system and so on, now main application way for construction integration and scenery supplementary system.The world present had the nearly 200 companies to produce the solar cell, but produces the plants mainly hand in the Japanese business.Recent years the South Korean Tri-star, LG expressed the positive participation's desire, China two sides across the Taiwan Strait are similarly very warm-hearted. It is reported that our country Taiwan in 2008 crystallizes the silicon solar cell productivity to reach 2.2GW, later will expand by every year 1GW productivity in the past and started to produce the thin film solar cell, this year will strengthen vigorously, Taiwan anticipated that “the solar cell great nation” emulated to Europe. in 2010 various countries and the area have above 1GW the productive plan solar cell manufacturer to have Japanese Sharp, German Q-Cells, Scho~Solar, turns 5 prestige RWE Solar, Chinese Suntech Power and so on 5 companies, above other 7 500MW productivity company.Recent years the world solar cell market advanced triumphantly, an excellence, but the rare financial storm brought the economic crisis, was similarly presses in solar cell market on dark clouds, the Major enterprise like Germany Q-Cells achievement declined accordingly, because pre-year the world too positive electricity market also the demand will be this year worn out, the petroleum price dropped, but the competitive power counter-promotion and so on disadvantage factor lowered But at the same time, the people also see the US. After the Obama comes on stage, soon applies the Green New Deal policy, may have 150,000,000,000 US dollar subsidy funds including the among them green energy program, Japan will also carry out the subsidy system to continue to popularize solar cell's application4. Solar cell electricity generation principle:The solar cell is pair of light has the response and can transform the energy of light the electric power the component. Many kinds of materials can produce the lightto bend down the effect, for example: Mono-crystalline silicon, polycrystalline silicon, amorphous silicon, gallium arsenic, selenium indium copper and so on. Their electricity generation principle basic same, presently take crystal as example description light electricity generation process. The P crystalline silicon may result in the N silicon after the doping phosphorus, forms the P-N knot.When light illumination solar cell surface, part of photons by silicon material absorption; The photon energy transfer has given the silicon atom, caused the electron to occur more moved, becomes the free electron to tie the both sides in P-N to gather has formed the potential difference, when exterior key-on, under this voltage's function, will have the electric current to wind through the exterior electric circuit to have certain output. This process's essence is: The photon energy transforms the electrical energy the process.5. Crystalline silicon solar cell's manufacture process:The silicon is on our star preserves one of most abundant quantity materials. Had discovered after the 19th century scientists crystalline silicon semiconductor characteristic, it changed all nearly, even humanity's thought. 20 century's ends, in our life everywhere obviously “silicon” the f orm and the function, the crystalline silicon solar cell is in the recent 15 years forms the industrial production to be quickest. The production process may divide into five steps approximately: a、depuration process.b、pulls good process.c、slice process.d、system battery process.e、and the seal process.6. Solar cell's application:In the 1960s, the scientists already applied the solar cells in the spatial technology-communication satellite power supply, on the century's end, in the human self-introspection's process, bends down unceasingly regarding the light generates electricity this kind so clean and the direct energy form already even more kind, not only in the spatial application, but also gives full play in the numerous domains.For example: The solar energy garden lamp, the solar electrical energy generation household with the system, the stockaded village power supply's independent system, the light bends down the water pump (potable water or irrigation), the correspondence power source, the petroleum oil pipeline cathodic protection, the fiber optic cable communications pumping station power source, in the seawater desalination system, the cities the guidepost, the highway guidepost and so on. Europe and America and so on advanced countries bend down the electricitygeneration the light to merge the city to use electricity the system and the remote border district nature village power supply system integrate the development direction. The solar cell and the building system's union already formed the industrial production tendency.参考译文：太阳能发电随着经济的发展、社会的进步，人们对能源提出越来越高的要求，寻找新能源成为当前人类面临的迫切课题。
太阳能相关英文文献翻译
Solar Tracker for Solar Water HeaterAbstractThe Solar Tracker team was formed in the fall of 2005 from five students in an ME design team, and a Smart House liaison. We continued the work of a previous solar tracker group. The task was to design a prototype tracking device to align solar panels optimally to the sun as it moves over the course of the day. The implementation of such a system dramatically increases the efficiency of solar panels used to power the Smart House. This report examines the process of designing and constructing the prototype, the experiences and problems encountered, and suggestions for continuing the project.1.IntroductionSolar tracking is the process of varying the angle of solar panels and collectors to take advantage o f the full amount of the sun’s energy. This is done by rotating panels to be perpendicular to the sun’s angle of incidence. Initial tests in industry suggest that this process can increase the efficiency of a solar power system by up to 50%. Given those gains, it is an attractive way to enhance an existing solar power system. The goal is to build a rig that will accomplish the solar tracking and realize the maximum increase in efficiency. The ultimate goal is that the project will be cost effective – that is, the gains received by increased efficiency will more than offset the one time cost of developing the rig over time. In addition to the functional goals, the Smart House set forth the other following goals for our project: it must not draw external power (self-sustaining), it must be aesthetically pleasing, and it must be weatherproof.The design of our solar tracker consists of three components: the frame, the sensor, and the drive system. Each was carefully reviewed and tested, instituting changes and improvements along the design process. The frame for the tracker is an aluminum prismatic frame supplied by the previous solar tracking group. It utilizes an ‘A-frame’ design with the rotating axle in the middle. Attached to the bottom of this square channel axle is the platform which will house the main solarcollecting panels. The frame itself is at an angle to direct the panels toward the sun (along with the inclination of the roof). Its rotation tracks the sun from east to west during the day.The sensor design for the system uses two small solar panels that lie on the same plane as the collecting panels. These sensor panels have mirrors vertically attached between them so that, unless the mirror faces do not receive any sun, they are shading one of the panels, while the other is receiving full sunlight. Our sensor relies on this difference in light, which results in a large impedance difference across the panels, to drive the motor in the proper direction until again, the mirrors are not seeing any sunlight, at which point both solar panels on the sensor receive equal sunlight and no power difference is seen.After evaluation of the previous direct drive system for the tracker, we designed a belt system that would be easier to maintain in the case of a failure. On one end of the frame is a motor that has the drive pulley attached to its output shaft. The motor rotates the drive belt which then rotates the pulley on the axle. This system is simple and easily disassembled. It is easy to interchange motors as needed for further testing and also allows for optimization of the final gear ratio for response of the tracker.As with any design process there were several setbacks to our progress. The first and foremost was inclement weather which denied us of valuable testing time. Despite the setbacks, we believe this design and prototype to be a very valuable proof-of-principle. During our testing we have eliminated many of the repetitive problems with the motor and wiring so that future work on the project will go more smoothly. We also have achieved our goal of tracking the sun in a ‘hands-off’ demo. We were able to have the tracker rotate under its own power to the angle of the sun and stop without any assistance. This was the main goal set forth to us by the Smart House so we believe our sensed motion prototype for solar tracking will be the foundation as they move forward in the future development and implementation of this technology to the house.2. Defining the ProblemThe project was to complete the “REV 2” design phase of the solar tracker to be used on the Smart House. While the team was comprised of members from the ME160 senior design course, the customer for this project was to be the Smart House organization. Jeff Schwane, a representative from the Smart House, was our liaison and communicated to our group the direction Smart House leadership wished us to proceed.At our first meeting with Jeff and Tom Rose, the following needs were identified:1.Track the sun during the daye no external power source3.Weather proof4.Cost effective power gain5.Must look good6.Solar panel versatile i.e. can fit different types of panelsWith these needs in hand, we constructed a Quality Function Deployment chart. This chart can be found in Appendix A. The QFD showed the major areas of concern might have been: number of panels/size of panels, internal power requirements, motor torque required.At our first meeting we were also able to set up our goals for the semester. Having a working prototype capable of tracking the sun was to be the main goal for the end of the semester, but we soon found that in order to accomplish this, we would be forced to omit portions of the design criteria in hopes they would be worked out later. This would result in the optimization of platform space on the roof to be irrelevant, with our goal being to have one platform track. It also led to the assumption that our base would not need to be tested for stability or required to be fastened to the roof. With an idea of where we were to begin, from scratch with the possibility of using the frame from the “REV 1” design, and an idea of where we were to finish, with a moving prototype, we constructed the Gantt chart that can be found in Appendix B. Our group planned to meet with Jeff once a week to make sure we were on track with the needs of the Smart House. Jeff would also meet with Tom Rose, the director of Smart House, at least once a week in order to keep everyone on the same page. With our goals in mind weembarked on the process of idea generation.3. Concepts and Research3.1 Tracking TypeOur group used a brainstorming approach to concept generation. We thought of ideas for different solar tracking devices, which proved difficult at times due to the existing frame and concept presented to us by Smart House. Other concepts were generated through research of pre-existing solar tracking devices. Originally our concept generation was geared towards creating a completely new solar tracker outside of the constraints of the previous structure given to us by Smart House. This initial brainstorming generated many concepts. The first one was a uni-axial tracking system that would track the sun east to west across the sky during the course of a day and return at the end of the day. This concept presented the advantage of simplicity and presented us with the option to use materials from the previous structure (which was also intended to be a uni-axial tracker) in construction. Another more complex concept was to track the sun bi-axially which would involve tracking the sun both east to west and throughout the seasons. The advantage of this concept was a more efficient harvesting of solar energy. The third concept was to only track throughout the seasons. This would provide small efficiency gains but nowhere near the gain provided by tracking east to west.The different structures we came up with to accomplish tracking motion included a rotating center axle with attached panels, hydraulic or motorized lifts which would move the main panel in the direction of the sun, and a robotic arm which would turn to face the sun. The clear efficiency gains coupled with the simplicity of design of the uni-axial tracking system and the existence of usable parts (i.e. motor and axle) for the rotating center axle structure, led us to the choice of the East to West tracking, rotating center axle concept.3.2 StructureOnce the method of motion was chosen, it was necessary to generate concepts for the structural support of the axle. Support could be provided by the triangular prismatic structure which was attempted by the previousSmart House solar tracker group or through the use of columns which would support the axis on either side. While the prismatic structure presented the advantage of mobility and an existing frame, the columns would have provided us with ease of construction, simple geometric considerations, and ease of prospective mounting on the roof. Due to the heightened intensity of time considerations, the previous financial commitment to the prismatic structure by Smart House, and our limited budget, the presence of the pre-existing frame proved to be the most important factor in deciding on a structure. Due to these factors we decided to work within the frame which was provided to us from the previous Solar Tracker group.3.2 Tracking MotionOnce the structural support was finalized we needed to decide on a means to actualize this motion. We decided between sensed motion, which would sense the sun’s position and move to follow it, and continuous clock type motion, which would track the sun based on its pre-determined position in the sky. We chose the concept of continuous motion based on its perceived accuracy and the existence of known timing technology. During the evaluation stage, however, we realized that continuous motion would prove difficult. One reason was the inability to draw constant voltage and current from the solar panels necessary to sustain consistent motion, resulting in the necessity for sensing the rotation position to compensate. Continuous motion also required nearly constant power throughout the day, which would require a mechanism to store power. Aside from these considerations, the implementation of a timing circuit and location sensing device seemed daunting. After consulting Dr. Rhett George, we decided on a device using two panels and shading for sensed motion.4. Analysis and Embodiment4.1 Structure GeometryThe geometry of the frame was created in order to allow the solar panels to absorb light efficiently. This was done by allowing rotation in the east-west direction for tracking the sun daily and a 36°inclination (Durham’s latitude) towards the south. Because this frame was designedto be placed on a roof with a slope of 25°, the actual incline of the frame was made to be 11°.The geometry of the existing platform structure was modified. This was done in order to incorporate the results from the Clear Day Model supplied to us by Dr. Knight. This model led to the conclusion that the platform should track to up to 60° in both directions of horizontal. Thus, the angle range of the frame had to be increased. The sides of the frame were brought in to increase the allowable angle of rotation, and they were brought in proportionally to maintain the inclination angle of 11°. Also, crosspieces were moved to the inside of the frame to allow greater rotation of the platform before it came into contact with the support structure.The panels used for sensing and powering rotation were placed on the plane of the platform. Mirrors were placed perpendicular to and in between the panels to shade one and amplify the other in order to produce a difference to power the motor. The sensing panels were placed outside the platform area to maintain the largest area possible for collecting panels. A third sensing panel was mounted nearly vertical and facing east to aid rotation back towards the sun in the morning. This panel was attached to the frame under the platform, so that during most of the day, it’s shaded with minimal effec ts on sensed rotation.Minimizing the torques on the motor was a main concern in order to minimize the motor power needed. The platform designed for the placement of the collecting solar panels was placed under the rotational shaft so that the panels would be aligned with it the rotational axis. Since the main panels comprise the majority of the weight putting these in the plane of the rotational axis reduces torque on the shaft. The sensing panels were placed symmetrically about the axis of rotation in order to prevent additional torque on the motor. The third panel was attached to the frame instead of the platform or rotational shaft so as to also avoid any torque.4.2 MaterialsMaterials selection for most of the frame was simple because it had already been constructed. The mirrors used for the amplification andshading of the sensing panels were also already purchased and available for use. Additional parts for attachment of the panels and mirrors to the frame were taken from the scrap pieces available in the machine shop. In our selection of sensing panels, size and power needed to be balanced effectively. The panels were to be as small as possible in order to add minimal stress and weight to the frame but also needed to be powerful enough to power the rotation of the platform. Therefore, the most powerful of the intermediate sized panels available were selected. The panels purchased also appeared to be the most reliable of our options. 4.3 Drive MechanismAfter designing a prototype and testing it, the motor purchased and used by the previous solar tracker group was slipping. It was removed, and the installation of a gear system with another simple motor was suggested and attempted. Professor Knight supplied some gears as well as some belts and pulleys. One end of the shaft was lathed so that one of the pulleys could be set on it, and spacers were bought so that a 6V motor we had available could power another pulley. These pulleys were to be connected by a belt. This motor demonstrated insufficient strength to turn the rotational shaft. The original motor, once detached, was taken apart and examined. Itappeared to be working again so a new pulley was purchased to fit it and was attached in the place of the 6V motor.5. Detailed Design5.1 FrameThe frame was designed from one inch square aluminum tubing, and a five foot long, two inch square tube for the axle. It is constructed with a rigid base and triangular prismatic frame with side supporting bars that provide stability. The end of the axle is attached to a system of pulleys which are driven by the motor. It is easily transported by removing the sides of the base and folding the structure.5.2 SensorOur sensing panels are bolted to the bottom of the main solar panel frame and braced underneath with half inch L-brackets. The mirrors are attached to the inside of the sensing panels and braced by L-brackets as well. The whole structure attaches easily to the main panel frame which isattached to the main axle using four 2-inch U-bolts. A third panel is bolted to the structure to return the main panels direction towards the horizon of sunrise.5.3 How the Sensor WorksOur sensor creates movement of the motor by shading one of the panels and amplifying the other when the system is not directly facing the sun. The two sensing panels are mounted parallel to the main panels symmetrically about the center axle with two mirrors in between them. The shading on one of the panels creates high impedance, while the amplified panel powers the motor. This happens until the panels receive the same amount of sunlight and balance each other out (i.e. when the sensing panels and main panels are facing the sun.). We initially attempted using a series configuration to take advantage of the voltage difference when one of the panels was shaded (Appendix C). This difference, however, was not large enough to drive the motor. We subsequently attempted a parallel configuration which would take advantage of the impedance of the shaded panel (Appendix C) and provide the current needed to drive the motor. Once the sensing mechanism has rotated from sunrise to sunset, the third panel, which is usually shaded, uses sunlight from the sunrise of the next day to power the motor to return the panels towards the direction of the sun.6. Prototype TestingInitial testing was done using just the sensing component and a 6V motor. The panels were tilted by hand to create shading and amplification.A series configuration of the sensing panels was initially tested and proved ineffective. Data acquisition showed a maximum of a 2V difference across the motor, which was insufficient to power it. Upon testing the panels individually, it was discovered that the open voltage across each individual panel would only vary between 21.5V and 19.5V when fully amplified and fully shaded, respectively. The current running through each panel, however, was seen to fluctuate between nearly 0 amps when shaded, up to 0.65 amps when fully amplified. Therefore, in order to take advantage of the increase in impedance of the solar panels due to shading, we chose to put our sensing panels in parallel with eachother and the motor. Tests with this configuration turned the motor in one direction, stopped when the sensing panels were nearly perpendicular to the sun, and reversed direction as the panels rotated past perpendicular. We found the angle range necessary to stop the motor to be very small. It was also observed that the panels rotated to slightly past perpendicular when they ceased motion. This error may be due to a difference in the innate resistance in each individual sensing panel. When tested it was found that one panel had a resistance of 52 kΩ, and the other panel resistance was 53 kΩ. Other testing found the voltage and current provided by the sensing solar panels to the motor to be consistent at all points, excluding when the solar panels are directly facing the sun. Through testing it was concluded that resistance may need to be added to one of the panels to compensate for the differences in the internal resistances of the individual panels, and a voltage regulator needs to be added to decrease the voltage seen across the motor. The original motor was prone to failure as its slippage caused the breakdown of our initial prototype after testing. This led to the institution of the pulley and belt driven system which would allow for easier maintenance given motor failure or slippage. The success of our initial testing and prototype proved to us the efficacy of our solar tracker design.7. ConclusionThroughout this project we enlisted the support of multiple resources (i.e. ME and EE professors, previous Smart House teams). We learned early on that a clear problem definition was essential to efficient design and progress. We struggled initially as we tried to design a tracking device that was diffe rent from the previous solar tracker group’s attempt, without fully weighing the size of their investment and the advantages of using the existing frame for our purposes. As we worked with the fixed frame construction from the previous group we learned that variability of design is key, especially when in the initial phases of prototyping. After many setbacks in testing of the solar panels, we learned that when working with solar panels, much time needs to be set aside for testing due to the unpredictability of the weather.The actual implementation of using the prototype in its intendedlocation on the Smart House roof requires weather-proofing to protect the wiring and electrical connections from the elements, housing for the motor, a bracing system to attach the structure to the roof, and possible redesign to eliminate excess height and simplify overall geometry. The efficiency of the sensor system could be improved by widening the mirrors or by placing blinders along the sides of the panels to decrease the effects of reflected and refracted light incident on the shaded sensing panel.适用于太阳能热水器的太阳能跟踪器摘要太阳能跟踪器设计团队成立于2005年秋季，设计团队由五名队员组成，我们还负责与智能家居的联络工作。
太阳能热光伏发电系统研究与仿真外文翻译本人版
一切论文免费Introduction1.1 Photovoltaic Energy Conversion1.2 solar Cells and Solar Energy Conversion1.3 solar Cell ApplicationsReferences1.1PHOTOVOLTAIC ENERGY CONVERSIONPhotovoltaic energy conversion is the direct production of electrical energy in the form of current and voltage from electromagnetic (i.e., light,including infrared, visible. and ultraviolet) energy. The basic four steps needed for photovoltaic energy conversion are:1. a light absorption process which causes a transition in a material(the absorber) from ground state to an excited state,2.the conversion of the excited state into (at least) a free negativeand free positive-charge carriers pair, and3. discriminating transport mechanism, which causes the resultingfree negative-charge carriers to move in one direction (to a con-tact that we will call the cathode) and the resulting free positive-charge carriers to move in another direction (to a contact that wewill call the anode).The energetic photogenerated negative-charge carriers arriving, at the cathode result in electrons which travel through an external path (an electric circuit). While traveling this path, they lose their energy doing something useful at an electrical "load," and finally they return to the anode of the cell. At the anode, every one of the returning electrons completes the fourth step of photovoltaic energy conversion, which is closing the circle by4. combining with an arriving positive-charge carrier, thereby returning theabsorber to the ground state.In some materials, the excited state may be a photogenerated free electron-free hole pair. In such a situation, step 1 and step 2 coalesce. In some materials, the excited state may be an exciton, In which case steps 1 and 2 are distinct.A study of the various man-made photovoltaic devices that carry out these four steps is the subject of this text. Our main interest is photovoltaic devices that can efficiently convert the energy in sunlight into usable electrical energy. Such devices are termed solar cells or solar photovoltaic devices. Photovoltaic devices can be designed to be effective for electromagnetic spectra other than sunlight. For example, devices can be designed to convert radiated heat (infrared light) into usable electrical energy. These are termed thermal photovoltaic devices. There are also devices which directly convert light into chemical energy. In these, the photogenerated excited state isused to drive chemical reactions rather than to drive electrons through an electric circuit. One example is the class of devices used for photolysis. While our emphasis is on solar cells for producing electrical energy, photolysis is briefly discussed later in the book .1.2 SOLAR CELLS AND SOLAR ENERGY CONVERSIONThe energy supply for a solar cell is photons coming from the sun .This input is distributed ,in ways that depend on variables like latitude, time of day, and atmospheric conditions ,over different wavelengths .the various distributions that are possible called solar spectra. The product of this light energy input, in the case of a solar cell, is usable electrical energy in the form of current and voltage. Some common "standard" energy supplies from the sun, which are available at or on the earth, are plot- ted against wavelength (λ) in W/㎡/nm spectra in Figure 1.l A. An alternative photons/㎡-s/nm spectrum is seen in Figure 1.1B.The spectra in Figure 1.1A give the power impinging per area(㎡)in a band of wavelengths 1 nm wide (the bandwitdth ∆λ)centered on each wavelength λ. In this figure, the AM0 spectrum is based on ASTM standard E 490FIGURE 1.1 Solar energy spectra.(a): Data expressed in watts per ㎡per nm bandwidth for()d hc λλλλΦ⎰AMO (from Ref .1 with permission) and for AM l.5G , and AW1.5D spectra(from Ref.2, with permission).(b): The AM l.5G data expressed in terms of impinging photons per second per cm² per 20 nm bandwidth.and is used for satellite applications. The AM1.5G spectrum, based on ASTM standard G173, is for terrestrial applications and includes direct and diffuse light .It integrates to 1000 W/㎡.the AM1.5D spectrum,also based on G173 ,is for terrestrial applications but includes direct light only. It integrates to 888 W/㎡. The spectrum in Figure 1.l B has been obtained from the AM1.5G spectrum of Figure 1.l A by converting power to photons per second per cm2 and by using a bandwidth of 20nm. Photon spectra Φ(λ), exemplified by that in Figure 1.l B, are more convenient for solar cell assessments, because optimally one photon translates into one free electron-free hole pair via steps 1 and 2 of the four steps needed for photovoltaic energy conversion.Standard spectra are needed in solar cell research, development, and marketing because the actual spectrum impinging on a cell in operation can vary due to weather, season, time of day, and location. Having standard spectra allows the experimental solar cell performance of one device to be compared to that of other devices and to be judged fairly, since the cens can be exposed to the same agreed-upon spectrum. The comparisons can be done even in the laboratory since standard distributions can be duplicated using solar simulators.The total power Pin per area impinging on a cell for a given photon spectrum Φ。
太阳能发电的影响英文作文
太阳能发电的影响英文作文1. Solar power has a significant impact on the environment. It is a renewable source of energy that doesnot emit any harmful pollutants or greenhouse gases that contribute to climate change. This means that solar power can help reduce the carbon footprint of a community or a country, and mitigate the negative effects of fossil fuel consumption on air quality, water quality, and biodiversity.2. Solar power also has economic benefits. It cancreate jobs in the manufacturing, installation, and maintenance of solar panels and related equipment. It can also reduce the dependence on imported fossil fuels, which can be subject to price volatility and geopolitical risks. Solar power can also provide electricity to remote or rural areas that are not connected to the grid, thereby improving access to energy and promoting economic development.3. Solar power has technological challenges as well. Solar panels require a large amount of space and sunlightto generate enough electricity to be cost-effective. They also require expensive materials and manufacturing processes, which can make them less affordable for low-income households or developing countries. In addition, solar power is intermittent, meaning that it depends on the availability of sunlight and cannot provide a consistent supply of electricity 24/7.4. Solar power also has social and cultural implications. It can change the way people think about energy and their relationship with the environment. It can promote a sense of empowerment and self-sufficiency among individuals and communities who generate their own electricity. It can also challenge the dominance of centralized power systems and the role of large energy corporations in shaping energy policies and practices.5. Solar power has policy implications as well. Governments can incentivize the adoption of solar power through tax credits, subsidies, and regulations that require utilities to integrate more renewable energy into their portfolios. They can also invest in research anddevelopment to improve the efficiency and affordability of solar panels and related technologies. However, policy decisions can also be influenced by political and economic interests, which can limit the potential of solar power to transform the energy landscape.。
光伏发电系统的建模英文参考文献
光伏发电系统的建模英文参考文献英文回答：Modeling of Photovoltaic Power Systems.Photovoltaic (PV) power systems convert sunlight into electricity using semiconductor devices called solar cells. These systems are becoming increasingly popular as a source of renewable energy due to their low operating costs, environmental benefits, and scalability.The modeling of PV power systems is essential for designing, optimizing, and evaluating their performance. Accurate models can help engineers predict the power output of a PV system under different operating conditions, assess the impact of system parameters on performance, and develop control strategies to maximize energy production.There are various approaches to modeling PV power systems, including:Equivalent circuit models: These models represent the electrical characteristics of a PV cell or module using an equivalent circuit consisting of resistors, diodes, and current sources.Mathematical models: These models use mathematical equations to describe the relationship between the input (solar irradiance) and output (electrical power) of a PV cell or module.Statistical models: These models use statistical techniques to estimate the probability distribution of the power output of a PV system based on historical data.The choice of modeling approach depends on the specific requirements of the analysis. For example, equivalentcircuit models are often used for detailed design and simulation of PV systems, while mathematical models are more suitable for performance analysis and optimization.中文回答：光伏发电系统的建模。
太阳能发电的基础中英文文献翻译
The Basics of Solar Power for Producing Electricity Using solar power to produce electricity is not the same as using solar to produce heat. Solar thermal principles are applied to produce hot fluids or air. Photovoltaic principles are used to produce electricity. A solar panel is made of the natural element, silicon, which becomes charged electrically when subjected to sun light.Solar panels are directed at solar south in the northern hemisphere and solar north in the southern hemisphere (these are slightly different than magnetic compass north-south directions) at an angle dictated by the geographic location and latitude of where they are to be installed. Typically, the angle of the solar array is set within a range of between site-latitude-plus 15 degrees and site-latitude-minus 15 degrees, depending on whether a slight winter or summer bias is desirable in the system. Many solar arrays are placed at an angle equal to the site latitude with no bias for seasonal periods.The intensity of the Sun's radiation changes with the hour of the day, time of the year and weather conditions. To be able to make calculations in planning a system, the total amount of solar radiation energy is expressed in hours of full sunlight perm, or Peak Sun Hours. This term, Peak Sun Hours, represents the average amount of sun available per day throughout the year.It is presumed that at "peak sun", 1000 W/m of power reaches the surface of the earth. One hour of full sun provides 1000 Wh perm = 1 kWh/m - representing the solar energy received in one hour on a cloudless summer day on a one-square meter surface directed towards the sun. To put this in some other perspective, the United States Department of Energy indicates the amount of solar energy that hits the surface of the earth every +/- hour is greater than the total amount of energy that the entire human population requires in a year. Another perspective is that roughly 100 square miles of solar panels placed in the southwestern . could power the country.The daily average of Peak Sun Hours, based on either full year statistics, or average worst month of the year statistics, for example, is used for calculation purposes in the design of the system. To see the average Peak Sun Hours for your area in the United States, Choose the area closest to your location for a good indication of your average Peak Sun Hours.For a view of global solar isolation values (peak sun-hours) use this link: , then, you can use [back] or [previous] on your browser to return right here if you want to.So it can be concluded that the power of a system varies, depending on the intended geographical location. Folks in the northeastern . will need more solar panels in their system to produce the same overall power as those living in Arizona. We can advise you on this if you have any doubts about your area.The four primary components for producing electricity using solar power, which provides common 120 volt AC power for daily use are: Solar panels, charge controller, battery and inverter. Solar panels charge the battery, and the charge regulator insures proper charging of the battery. The battery provides DC voltage to the inverter, and the inverter converts the DC voltage to normal AC voltage. If 240 volts AC is needed, then either a transformer is added or two identical inverters are series-stacked to produce the 240 volts.The output of a solar panel is usually stated in watts, and the wattage is determined by multiplying the rated voltage by the rated amperage. The formula for wattage is VOLTS times AMPS equals WATTS. So for example, a 12 volt 60 watt solar panel measuring about 20 ×44 inches has a rated voltage of and a rated amperage.V × A = Wvolts times amps equals 60 wattsIf an average of 6 hours of peak sun per day is available in an area, then the above solar panel can produce an average 360 watt hours of power per day; 60w times 6 hrs= 360 watt-hours. Since the intensity of sunlight contacting the solar panel varies throughout the day, we use the term "peak sun hours" as a method to smooth out the variations into a daily average. Early morning and late-in-the-day sunlight produces less power than the mid-day sun. Naturally, cloudy days will produce less power than bright sunny days as well. When planning a system your geographical area is rated in average peak sun hours per day based on yearly sun data. Average peak sun hours for various geographical areas is listed in the above section.Solar panels can be wired in series or in parallel to increase voltage or amperage respectively, and they can be wired both in series and in parallel to increase both volts and amps. Series wiring refers to connecting the positive terminal of one panel to the negative terminal of another. The resulting outer positive and negative terminals will produce voltage the sum of the two panels, but the amperage stays the same as one panel. So two 12 volt/ amp panels wired in series produces 24 volts at amps. Four of these wired in series would produce 48 volts at amps. Parallel wiring refers to connecting positive terminals to positive terminals and negative to negative. Theresult is that voltage stays the same, but amperage becomes the sum of the number of panels. So two 12 volt/ amp panels wired in parallel would produce 12 volts at 7 amps. Four panels would produce 12 volts at 14 amps.A charge controller monitors the battery's state-of-charge to insure that when the battery needs charge-current it gets it, and also insures the battery isn't over-charged. Connecting a solar panel to a battery without a regulator seriously risks damaging the battery and potentially causing a safety concern.Charge controllers (or often called charge regulator) are rated based on the amount of amperage they can process from a solar array. If a controller is rated at 20 amps it means that you can connect up to 20 amps of solar panel output current to this one controller. The most advanced charge controllers utilize a charging principal referred to as Pulse-Width-Modulation (PWM) - which insures the most efficient battery charging and extends the life of the battery. Even more advanced controllers also include Maximum Power Point Tracking (MPPT) which maximizes the amount of current going into the battery from the solar array by lowering the panel's output voltage, which increases the charging amps to the battery - because if a panel can produce 60 watts with volts and amps, then if the voltage is lowered to say 14 volts then the amperage increases to (14v ×amps = 60 watts) resulting in a 19% increase in charging amps for this example.Many charge controllers also offer Low Voltage Disconnect (LVD) and Battery Temperature Compensation (BTC) as an optional feature. The LVD feature permits connecting loads to the LVD terminals which are then voltage sensitive. If the battery voltage drops too far the loads are disconnected - preventing potential damage to both the battery and the loads. BTC adjusts the charge rate based on the temperature of the battery since batteries are sensitive to temperature variations above and below about 75F degrees.The Deep Cycle batteries used are designed to be discharged and then re-charged hundreds or thousands of times. These batteries are rated in Amp Hours (ah) - usually at 20 hours and 100 hours. Simply stated, amp hours refers to the amount of current - in amps - which can be supplied by the battery over the period of hours. For example, a 350ah battery could supply continuous amps over 20 hours or 35 continuous amps for 10 hours. To quickly express the total watts potentially available in a 6 volt 360ah battery; 360ah times the nominal 6 volts equals 2160 watts or (kilowatt-hours). Like solar panels, batteries are wired in series and/or parallel to increase voltage to the desired level and increase amp hours.The battery should have sufficient amp hour capacity to supply needed power during the longest expected period "no sun" or extremely cloudy conditions. A lead-acid battery should be sized at least 20% larger than this amount. If there is a source of back-up power, such as a standby generator along with a battery charger, the battery bank does not have to be sized for worst case weather conditions.The size of the battery bank required will depend on the storage capacity required, the maximum discharge rate, the maximum charge rate, and the minimum temperature at which the batteries will be used. During planning, all of these factors are looked at, and the one requiring the largest capacity will dictate the battery size.One of the biggest mistakes made by those just starting out does not understand the relationship between amps and amp-hour requirements of 120 volt AC items versus the effects on their DC low voltage batteries. For example, say you have a 24 volt nominal system and an inverter powering a load of 3 amps, 120VAC, which has a duty cycle of 4 hours per day. You would have a 12 amp hour load (3A × 4 hrs=12 ah). However, in order to determine the true drain on your batteries you have to divide your nominal battery voltage (24v) into the voltage of the load (120v), which is 5, and then multiply this times your 120vac amp hours (5 × 12 ah). So in this case the calculation would be 60 amp hours drained from your batteries - not the 12 ah. Another simple way is to take the total watt-hours of your 120VAC device and divide by nominal system voltage. Using the above example; 3 amps × 120 volts × 4 hours = 1440 watt-hours divided by 24 DC volts = 60 amp hours.Lead-acid batteries are the most common in PV systems because their initial cost is lower and because they are readily available nearly everywhere in the world. There are many different sizes and designs of lead-acid batteries, but the most important designation is that they are deep cycle batteries. Lead-acid batteries are available in both wet-cell (requires maintenance) and sealed no-maintenance versions. AGM and Gel-cell deep-cycle batteries are also popular because they are maintenance free and they last a lot longer.太阳能发电的基础太阳能发电板由天然成分的硅制成，受太阳光控制的电池板。
太阳能光伏发电外文翻译汇总
毕业设计(论文)外文资料翻译系：电气工程学院专业：电气工程及其自动化专业姓名：刘哲瑄外文出处：University of Technology, Mauritius University of Mauritius B SeetanahAJ Khadaroo学号： 2011316020526 ：附件：1.外文资料翻译译文；2.外文原文。
附件1：外文资料翻译译文太阳能发电技术——光伏发电系统控制器1 太阳能充放电控制器现状1.1太阳能光伏发电太阳能作为新能源有着巨大的优势，所以世界各国都在努力研发新技术进行获取比较成熟的是太阳能光伏发电技术。
太阳能光伏发电现已成为新能源和可再生能源的重要组成部分，也被认为是当前世界最有发展前景的新能源技术。
目前太阳能光伏发电装置已广泛应用于通讯、交通、电力等各个方面。
在进行太阳能光伏发电时，由于一般太阳能极板输出电压不稳定，不能直接将太阳能极板应用于负载，需要将太阳能转变为电能后存储到一定的储能设备中，如铅酸蓄电池。
但只有当太阳能光伏发电系统工作过程中保持蓄电池没有过充电，也没有过放电，才能使蓄电池的使用寿命延长，效率也得以提高，因此必须对工作过程加以研究分析而予以控制，这种情况下太阳能充电控制器应运而生。
1.2充电控制器的作用及现状太阳能充电控制器具备充电控制、过充保护、过放保护、防反接保护及短路保护等一系列功能，解决了这一难题，这样控制器在这个过程中起着枢纽作用，它控制太阳能极板对蓄电池的充电，加快蓄电池的充电速度，延长蓄电池的使用寿命。
同时太阳能充放电控制器还控制蓄电池对负载的供电，保护蓄电池和负载电路，避免蓄电池发生过放现象，由此可见，控制器具有举足轻重的作用。
目前市场上有各种各样的太阳能控制器，但这些控制器主要问题对于蓄电池的保护不够充分，不合适的充放电方式容易导致蓄电池的损坏，使蓄电池的使用寿命降低。
目前，控制器常用的蓄电池充电法包括三种;恒流充电法、阶段充电法和恒压充电法。
太阳能电池 英文文章
太阳能电池英文文章Solar Panels: Harnessing the Power of the SunSolar panels, also known as photovoltaic panels, are an essential part of renewable energy technology that harnesses the power of the sun to generate electricity. They play a crucial role in our efforts to transition towards cleaner and more sustainable energy sources.At their core, solar panels are composed of numerous solar cells made from semiconductor materials such as silicon. These cells absorb sunlight and convert its energy into direct current (DC) electricity through the photovoltaic effect. This electricity can then be used to power homes, businesses, and even entire communities.The advantages of solar panels are manifold. First and foremost, they are environmentally friendly, producing electricity without emitting greenhouse gases or other pollutants that contribute to climate change. This makes them a key player in reducing our reliance onfossil fuels and mitigating the harmful effects of global warming.Moreover, solar panels offer energy independence and resilience. By generating electricity onsite, individuals and communities can reduce their dependence on centralized power grids and insulate themselves from fluctuations in energy prices.From a financial perspective, solar panels can also provide long-term savings. While the initial investment in solar technology can be significant, it is often offset by reduced energy bills over time. Many governments and organizations also offer incentives, tax credits, and subsidies to encourage the adoption of solar energy, further enhancing its economic feasibility.However, challenges remain, including the intermittency of solar power (due to variations in sunlight availability) and the need for adequate storage solutions to store surplus energy for useduring periods of low sunlight.In conclusion, solar panels represent a cornerstone of sustainable energy infrastructure. Their ability to harness the abundant energy of the sun in a clean and efficient manner holds promise for a brighter, greener future. As technology advances and economies of scale improve, solar energy is poised to play an increasingly significant role in meeting our global energy needs while protecting the planet for future generations.。
太阳能电池中英文对照外文翻译文献
(文档含英文原文和中文翻译)中英文翻译英文原文Historical Review of Solar EnergySolar generally refers to the suns radiation energy. Carried out in the solar interior from H together into a helium the nuclear reaction, kept a huge release of energy, and continue to the space radiation energy, which is solar energy. This solar nuclear fusion reaction inside the can to maintain the hundreds of millions of first time. Solar radiation to space launch 3.8x10 ^ 23kW power of the radiation, of which 20 billionth of the Earths atmosphere to reach. Solar energy reaching the Earths atmosphere, 30% of the atmosphere reflectance, 23% of atmospheric absorption, and the rest to reach the Earths surface.Its power of 80 trillion kW, that is to say a second exposure to the suns energy on Earth is equivalent to five million tons of coal combustion heat release. The average per square meter in the atmosphere outside the area of energy per minute to receiveabout 1367w. A broad sense of the solar energy on earth many sources, such as w ind energy, chemical energy, potential energy of water and so on. The narrow sense is limited to solar radiation of solar light thermal, photovoltaic and photochemical conversion of the directly.At this stage, the worlds solar energy is still the focus of the study of solar energy power plant, but the diversification of the use of the condenser, and the introduction of flat-plate collector and a low boiling point working fluid, the device gradually expanded up to maximum output power 73.64kW, Objective To compare the clear and practical, cost remains high. The construction of a typical device are as follows: 1901, California built a solar-powered pumping devices, the use of truncated cone condenser power: 7.36kW; 1902 ~ 1908 years, built in the United States five sets of double-cycle solar-powered engines, the use of flat-panel collector and a low boiling point working fluid; in 1913,Human use of solar energy has a long history. China more than 2000 years ago, back in the Warring States period, one will find that the use of four steel mirror to focus sunlight ignition; use of solar energy to dry agricultural products. The development of modern, solar energy has become increasingly widespread use, it includes the use of solar energy solar thermal, solar photovoltaic and solar energy use, such as the photochemical use. The use of solar photochemical reaction, a passive use (photo-thermal conversion) and the photoelectric conversion in two ways. A new solar power and renewable sources of energy use.Silicon photovoltaic cells mainly in the absorption of solar light energy emitted by silicon photocell is mainly extracted from the sand by the development of Bell Labs. Solar energy is the internal or the surface of the sun sunspot continuous process of nuclear fusion reactions produce energy. Earths orbit on the average solar radiation intensity for the 1367w / ㎡. Circumference of the Earths equator to 40000km, and thus calculated the Earths energy can be obtained 173000TW. At sea level standard for peak intensity 1kw/m2, a point on the Earths surface 24h of the annual average radiation intensity 0.20kw / ㎡, which is equivalent to have 102000TW energy Human dependence on these energy to survive, including all other forms of renewable energy (except for geothermal energy resources), although the total amount of solar energy resources is the human equivalent of the energy used by ten thousand times, but low energy density of solar energy, and it vary from place to place, from time to time change, the development and utilization of solar energy which is facing a major problem. These features will make solar energy in the integrated energy systemof the role of subject to certain restrictions.The use of solar cells, through the photoelectric conversion to solar energy conversion is included in electricity, the use of solar water heaters, the use of solar heat hot water and use water for power generation, using solar energy for desalination. Now, the use of solar energy is not very popular, the use of solar power costs are h igh there, the problem of low conversion efficiency, but for satellite solar cells to provide energy has been applied.Although the Earths atmosphere solar radiation to the total energy only 22 billionths of a radiation energy, it has been as high as 173,000 TW, that is to say a second exposure to the suns energy on Earth is equivalent to five million tons of coal. Earth wind energy, hydropower, ocean thermal energy, wave energy and tidal energy as well as some comes from the sun; even in the face of the earths fossil fuels (such as coal, oil, natural gas, etc.) that is fundamentally Since ancient times the storage of solar energy down, so by including a broad range of solar energy is very large, he narrow sense is limited to solar radiation of solar light thermal, photovoltaic and photochemical conversion of the directly.Solar energy is the first time, but also renewable energy. It is rich in resources, can use free of charge, and without transportation, without any pollution to the environment. For mankind to create a new life, so that social and human energy into a era of reducing pollution.Solar cells have to respond to a light and convert solar energy to power the device. Photovoltaic effect can produce many kinds of materials, such as: single crystal silicon, polycrystalline silicon, amorphous silicon, gallium arsenide, copper indium selenium. They are basically the same principle of power generation is now crystal as an example to describe the process of light generation. P-type crystalline silicon available after phosphorus-doped N-type silicon, the formation of P-N junction.When the surface of solar light, the silicon material to be part of photon absorption; photon energy transfer to the silicon atom, electronic transitions have taken place, as a free-electron concentration in the PN junction formed on both sides of the potential difference, when the external circuit connected when the effects of the voltage, there will be a current flowing through the external circuit have a certain amount of output power. The substance of this process are: photon energy into electrical energy conversion process.Si is our planets abundance of storage materials. Since the 19th century,scientists discovered the properties of crystalline silicon semiconductor, it almo st changed everything, even human thought, end of the 20th century. Our lives can be seen everywhere, silicon figure and role of crystalline silicon solar cells is the formation of the past 15 years the fastest growing industry. Production process can be divided into five steps: a, purification process b, the process of pulling rod c, slicing the process of d, the process of system battery e, the course package.Solar photovoltaicIs a component of photovoltaic panels in the sun exposure will generate direct current power generation devices, from virtually all semiconductor materials (eg silicon) are made of thin photovoltaic cells composed of solid. Because there is no part of activity, and would thus be a long time operation would not lead to any loss. Simple photovoltaic cells for watches and computers to provide energy, and more complex PV systems to provide lighting for the housing and power supply. Photovoltaic panels can be made into components of different shapes, and components can be connected to generate more power. In recent years, the surface of the roof and building will be the use of photovoltaic panels components,Even be used as windows, skylights or sheltered part of devices, which are often called photovoltaic facilities with PV systems in buildings.Solar thermalModern technology solar thermal polymerization sunlight and use its energy produced hot water, steam and electricity. In addition to the use of appropriate technology to collect solar energy, the building can also make use of the su ns light and heat energy is added in the design of appropriate equipment, such as large windows or use of the south can absorb and slowly release the sun heat the building materials .According to records, human use of solar energy has more than 3,000 years of history. To solar energy as an energy and power use, only 300 years of history. The real solar as the near future to add much-needed energy, the basis of the future energy mix is the latest thing. Since the 20th century, 70s, solar technology has made rapid advances, solar energy use with each passing day. Solar energy utilization in modern history from the French engineers in 1615 in the Solomon and Germany Cox invented the worlds first solar-powered engines run. The invention is a use of solar energy heating the air to the expansion and pumping machines acting.In 1615 ~ 1900, between the developed world and more than one solar power plant and a number of other solar energy devices. Almost all of these power plantscollect the sun means the use of condenser, engine power is not, the working fluid is water vapor, which is very expensive, not practical value, the majority of individual studies for manufacturing solar enthusiasts. 100 years of the 20th century, the history of the development of solar energy technology in general can be divided into seven stages.1. The First Stage (1900---1920)In this stage, the research focus of solar energy in the world were still on the solar-powered device which variable photospot method were applied and flat plate heat collector and low boiling point actuating medium were started to use; the capacity of the device was gradually expanded with the max. output power of 73.46kW; device was utilized with the definite end-use and in higher cost.The typical built device included: one set of solar energy pumping device constructed in California of U.S in 1901 which employed truncation taper photospot with the power of 7.36kW; 5 sets of twin-circulated solar-powered engine built in U.S in 1902 to 1908 which employed the flat plate heat collector and low boiling point actuating medium; 1 set of solar energy pump comprised of 5 parabolic mirror in a length of 62.5m, width of 4m built in Cairo of Egypt in which the total light collecting area could reach 1250m2.2. The Second Stage (1920-1965)For these 20 years, the research of solar energy was implementing on the poor stage, which the mandate to participate in the development and the research projects had been widely declined due to the mass utilization of fossil fuels and the second world war (1935---1945) while the s olar energy couldn’t satisfy the urgent demand upon the energy. Therefore, the research and development of solar energy was due to be gradually deserted.3. The Third Stage (1945-1965)For these 20 years after the Second World War, some foresight person has noticed that the petroleum and natural gas resources had been rapidly decreased and called for attention on these issues in order to gradually promote the recovery and development of the solar energy research. Solar energy institutes were setup and academic exchanges and exhibitions were held which raised the research upsurge again on solar energy.In this period, great progress was achieved in the research of solar energy, in particular: the foundation theory of selective paints proposed in the First International Solar Thermal Academic Conference in 1955, which black nickel had been developedas the practical selective paints, contributing to development of high-effective heat collector; the practical silicon solar cells developed by Bell Lab in U.S in 1954 which laid the foundation for large scale utilization of photovoltaic generation.Furthermore, there were still other significant results, including:a. One set of 50kW solar stove was built by French National Research Center in 1952;b. The worldwide prototype ammonia-water absorbing air conditioning system heated by flat plate heat collector with the capacity of 5 tons was built in Florida of U.S in 1960;c. An engine equipped with silicon window was invented in 1961.In this stage, research on foundation theory and foundation material of solar energy was reinforced and academic breakthrough, i.e. selective paints and silicon solar cells were achieved. The flat plate had been well developed and ripe in technologies. Progress had been achieved in the research of solar energy absorbing air conditioners and a batch of pilot solar room was established. Preliminary research was conducted on the engine and tower type solar-powered generation technologies.4. The Fourth Stage (1965---1973)In the stage, the research work on solar energy was standstill due to the reason that the utilization technologies of solar energy had entered into the growing stage which was no ripe in process, heavy in investment and lower in effect. Thus it cannot compete with conventional energy, which resulted in the absence of attention and support from the public, enterprise and government.5. The Fifth Stage (1973---1980)After petroleum played a leading role in the worldwide energy structure, it has been a key factor to control the economic and determine the fatal, development and declining of a country. After the explosion of Middle East War at Oc., 1973, OPEC employed the method of declining the production and increasing the price to support the struggle and safeguard the national benefits which resulted in heavy economic attack for those countries that relied on importing large amount of inexpensive petroleum from the region of Middle East. Thus, some people in the western countries were frightened to call that the energy or petroleum crisis had been launched in the world. This crisis made people realized that the existing energy structure should be completely changed and transition to the future energy structure should be speed up.From that on, many countries, especially the industrialized countries turned their attention towards the support on the research and development of solar energy andother renewable energy technologies. The upsurge of developing and utilizing solar energy had been raised again in the world. In 1973, U.S drew up a government scale sunlight power generation program which the research budget for solar energy were increased in a large amount, and solar energy development bank was to established to facilitate the solar energy products to be commercialized. In 1974, Japan published the sunlight program made by the government, among which the solar energy development projects included solar room, industrial-use solar energy system, solar thermal generation, solar cells production system, scattered and large scale photovoltaic generation system. In order to implement this program, the government of Japan input large amount of manpower, material resources and financial resources.The upsurge on the utilization of solar energy raised in 1970s in the world also impacted on China. Some foresight technicians started to devote to the solar energy industry one after another and positively proposed to the relative department of the government and published books and periodicals to introduce the international trends on the utilization of solar energy. Solar stove was popularized and utilized in countryside; solar water heater was launched in the city; solar cells used in space have started to be applied in the ground. In 1975, the first national solar energy utilization working exchanges conference held in An yang, Henan Province further promoted the development of solar energy industry in China. After this meeting, the solar energy research and promotion had been brought into the government program and awarded support of specialized fund and material. In some universities and institutes, solar energy task team and research departments were established one after another. Solar energy research institutes were also launched in some places. At that time, an upsurge on utilization of solar energy was emerging in China.During this period, research and development of solar energy entered into an unprecedented well-developed stage with the following characteristics:a. Each country enhanced planning on solar energy research. Many countries worked out short term and long-term sunlight program. The utilization of solar energy had been a governmental action with intensive support. The international cooperation was very active which some developing countries had started to participate in the utilization of solar energy.b. The research field was expanding; research work was developed day by day and significant results achieved, for example, CPC, vacuum heat collecting pipe, non-crystal silicon solar cells, water-photolyzed hydrogen production and solar energy thermal power generation.c. The solar energy development program worked out by each country existed the problems that the requirement was too high and urgent and insufficient expectation on difficulty in implementation. They have thought to replace the mineral energy in the short time and to utilize the solar energy in large scale. For example, U.S has once scheduled to build a small size solar energy demonstration satellite power station in 1985 and one set of 5 million kW space solar energy power station in 1995. In fact, this program has been adjusted in later, and the space solar energy power station has not yet been realized.d. Products such as solar water heater and solar cells were started to commercialize. The solar energy sector has been preliminarily established with a small scale and ineffective economic effects.6. The Sixth Stage (1980-1992)The upsurge on utilization of solar energy emerged in 1970s was fallen into a stage of being developed in a low and slow step in 1980s. Many countries in the world declined the research budget for solar energy in successive in a large amount, in particular the U.S.The main reasons resulted in this situation were that the international oil price was corrected in a large range while solar energy product cost was still remaining as before which may be of no competitive capability; no any significant breakthrough on solar energy technologies to increase the efficiency and reduce the cost which led to break down people’s confidence to develop solar energy; increased development on nuclear power which may restrain on a certain degree on the development of solar energy.Influenced on the turndown of solar energy in the worldwide in 1980s, research work in China also declined in a certain degree. Due to the reason that the utilization of solar energy was heavy in investment, ineffective in results, difficult in energy storage and large in land covering, solar energy should be considered as the future energy. Some person even proposed that the technology could be introduced after it would be developed successfully. Only few people supported such viewpoint, but it was very harmful which will result in unfavorable influence on the development of solar energy industry.During this period, although the research budget has been mitigated in a large amount, the research work remained uninterruptedly, among which some projects achieved progress which facilitated people to investigate seriously on the program and goads worked out before and to adjust the research focus so that to strive for greatachievement by less input.7. The Seventh Stage (1992---Until Now)Excessive burning of fossil fuel led to worldwide environmental pollution and ecological destruction, which has been threatened the substance and development of human beings. Under such circumstance, UN held the international environment and development conference in Brazil in 1992. On this meeting, a series of importan t document were published including the Environment and Development Manifesto,Agenda of 21st century and UN Framework Pact on Climate Changing in which the environment and development were brought into the integrated framework, and sustainable model was established. After this conference, each country enhanced the development of clean energy technologies, and developed the solar energy in line with the environmental protection so as to make the utilization of solar energy be well developed.After this conference, Chinese government also turned their attention towards the environment and development and pointed out 10 pieces of tactic and measure definitely to develop and popularize the clean energy including solar energy, wind energy, thermal energy, tidal energy and biomass energy in accordance with the reality; worked out Agenda of 21st century in China and further focused the solar energy projects. In 1995, the State Planning, the State Economic and Trade Commission, the State Ministry of Science and Technology worked out the Outline for Development of New and Renewable Energy from 1996 to 2010, which definitely pointed out the goads, objectives and relative tactic and measure towards the development of new and renewable energy from 1996 to 2010 in China. The publishing and implementation of the document further promoted the development of solar energy industry in China.In 1996, UN held the worldwide solar energy summit conference in Zimbabwe. The Solar Energy and Sustainable Development Manifesto was published after the meeting. Important document, i.e.Worldwide Solar Energy 10-Year Action and Program (1996---2005), International Solar Energy Pact, Worldwide Solar Energy Strategic Planning were discussed during the meeting. This meeting further showed eac h country’s commitment to developing the solar energy. Worldwide joint action was required to extensively utilize the solar energy.After 1992, the worldwide utilization of solar energy has entered into a developing stage with the characteristic that:a. The utilization of solar energy can be consistent to the sustainable development and environment protection, and can be carried out jointly to realize thedevelopment strategy in the world;b. Definite development goals with focus projects and effective measure, which will be favorable to overcome the shortage to ensure the long-term development of solar energy industry;c. In the course of expanding the research of solar energy, attention was paid to convert the academic results into production, develop solar energy industry, speed up the progress to be commercialized, expand the utilization field and scale and increase the economic benefits;d. Active international cooperation in the field of solar energy with expanding scale and obvious effect.In view of the review, the development of solar energy in the 20th century was not so smooth. Generally speaking, low tide period was happened after every high tide period. The low tide period lasted for nearly 45 years. The development of solar energy differed with that of coal, petroleum and nuclear energy in understanding and development period, which could be demonstrated that it was very difficulty to develop the solar energy and it cannot be realized to large scale utilize in the short term. On the other hand, it was showed that the utilization of solar energy was also affected by the supply of mineral energy, politics and war. However, in a word, the solar energy has achieved greatly in academic results in 20th century than in any other century.英文翻译太阳能利用史太阳能一般指太阳光的辐射能量。
光伏发电技术中英文资料外文翻译文献
光伏发电技术中英文资料外文翻译文献Research Article 1: Title of the ArticleAbstractResearch Article 2: Title of the ArticleAbstractThis research article focuses on the environmental impact of PV technology. It explains how solar panels convert sunlight into electricity and highlights the role of PV systems in reducing greenhouse gas emissions. The article discusses the benefits and challenges associated with PV technology, including its dependence on sunlight, land requirements, and recyclability of materials. It also examines the life cycle assessment (LCA) of PV systems to evaluate their overall environmental performance. The research concludes by suggesting strategies to mitigate the environmental impact of PV technology, suchas improving panel efficiency and implementing responsible recycling practices.Research Article 3: Title of the ArticleAbstractThis article explores the economic aspects of PV technology. It analyzes the cost of installing and maintaining PV systems, including considerations for equipment, installation, and operation. The research discusses various financial incentives, such as government subsidies and tax credits, that promote the adoption of PV technology. It also highlights the economic benefits of PV systems, including job creation and energy independence. The article concludes by discussing the future potential of PV technology in reducing energy costs and stimulating economic growth.Research Article 4: Title of the ArticleAbstractThe focus of this research article is on the technical advancements in PV technology. It discusses the development of new materials and manufacturing processes to improve the efficiency and reliability of solar panels. The article explores the integration of PV systems with smart grid technology and how it enables better management of electricity generation and consumption. It also highlights the role of artificial intelligence and machine learning in optimizing PV system performance. The research concludes by suggesting future research directions in PV technology, such as exploring nanomaterials and enhancing the intelligence of PV systems.Conclusion总结这份文献收录了关于光伏发电技术的各个方面的研究，涵盖了与环境影响、经济考量和技术进展相关的主题。
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太阳能发电外文翻译文献(文档含中英文对照即英文原文和中文翻译)Design of a Lead-Acid Battery Charging and Protecting IC in Photovoltaic SystemZENG De-you,LING Chao-dong,LI Guo-gang1.IntroductionSolar energy as an inexhaustible, inexhaustible source of energy more and more attention. Solar power has become popular in many countries and regions, solar lighting has also been put into use in many cities in China. As a key part of the solar lighting, battery charging and protection is particularly important. Sealed maintenance-free lead-acid battery has a sealed, leak-free, pollution-free, maintenance-free, low-cost, reliable power supply during the entire life of the battery voltage is stable and no maintenance, the need for uninterrupted for the various typesof has wide application in power electronic equipment, and portable instrumentation. Appropriate float voltage, in normal use (to prevent over-discharge, overcharge, over-current), maintenance-free lead-acid battery float life of up to 12 ~ 16 years float voltage deviation of 5% shorten the life of 1/2. Thus, the charge has a major impact on this type of battery life. Photovoltaic, battery does not need regular maintenance, the correct charge and reasonable protection, can effectively extend battery life. Charging and protection IC is the separation of the occupied area and the peripheral circuit complexity. Currently, the market has not yet real, charged with the protection function is integrated on a single chip. For this problem, design a set of battery charging and protection functions in one IC is very necessary.2.System design and considerationsThe system mainly includes two parts: the battery charger module and the protection module. Of great significance for the battery as standby power use of the occasion, It can ensure that the external power supply to the battery-powered, but also in the battery overcharge, over-current and an external power supply is disconnected the battery is to put the state to provide protection, the charge and protection rolled into one to make the circuit to simplify and reduce valuable product waste of resources. Figure 1 is a specific application of this Ic in the photovoltaic power generation system, but also the source of this design.Figure1 Photovoltaic circuit system block diagramMaintenance-free lead-acid battery life is usually the cycle life and float life factors affecting the life of the battery charge rate, discharge rate, and float voltage. Some manufacturers said that if the overcharge protection circuit, the charging rate can be achieved even more than 2C (C is the rated capacity of the battery), battery manufacturers recommend charging rate of C/20 ~ C/3. Battery voltage and temperature, the temperature is increased by 1 °C, single cell battery voltage drops 4 mV , negative temperature coefficient of -4 mV / ° C means that the battery float voltage. Ordinary charger for the best working condition at 25 °C; charge less than the ambient temperature of 0 °C; at 45 °C may shorten the battery life due to severe overcharge. To make the battery to extend the working life, have a certain solar battery array Charge controllercontroller Dischargecontroller DC load accumulatorunderstanding and analysis of the working status of the battery, in order to achieve the purpose of protection of the battery. Battery, there are four states: normal state, over-current state over the state of charge, over discharge state. However, due to the impact of the different discharge current over-capacity and lifetime of the battery is not the same, so the battery over discharge current detection should be treated separately. When the battery is charging the state a long time, would severely reduce the capacity of the battery and shorten battery life. When the battery is the time of discharge status exceeds the allotted time, the battery, the battery voltage is too low may not be able to recharge, making the battery life is lower. Based on the above, the charge on the life of maintenance-free lead-acid batteries have a significant impact, while the battery is always in good working condition, battery protection circuit must be able to detect the normal working condition of the battery and make the action the battery can never normal working state back to normal operation, in order to achieve the protection of the battery.3.Units modular design3.1The charging moduleChip, charging module block diagram shown in Figure 2. The circuitry includes current limiting, current sensing comparator, reference voltage source, under-voltage detection circuit, voltage sampling circuit and logic control circuit.Figure2 Charging module block diagramdriverV oltage amplifierV oltage sampling comparatorStart amplifierState level control Charging indicator Logicalmodule Undervoltage detection circuitR- powerCurrent sampling comparator Limitingamplifier Power indicatorThe module contains a stand-alone limiting amplifier and voltage control circuit, it can control off-chip drive, 20 ~30 mA, provided by the drive output current can directly drive an external series of adjustment tube, so as to adjust the charger output voltage and current . V oltage and current detection comparator detects the battery charge status, and control the state of the input signal of the logic circuit. When the battery voltage or current is too low, the charge to start the comparator control the charging. Appliances into the trickle charge state when the cut-off of the drive, the comparator can output about 20 mA into the trickle charge current. Thus, when the battery short-circuit or reverse, the charger can only charge a small current, to avoid damage to the battery charging current is too large. This module constitutes a charging circuit charging process is divided into two charging status: high-current constant-current charge state, high-voltage charge status and low-voltage constant voltage floating state. The charging process from the constant current charging status, the constant charging current of the charger output in this state. And the charger continuously monitors the voltage across the battery pack, the battery power has been restored to 70% to 90% of the released capacity when the battery voltage reaches the switching voltage to charge conversion voltage Vsam charger moves to the state of charge. In this state, the charger output voltage is increased to overcharge pressure V oc is due to the charger output voltage remains constant, so the charging current is a continuous decline. Current down to charge and suspend the current Ioct, the battery capacity has reached 100% of rated capacity, the charger output voltage drops to a lower float voltage VF.3.2 Protection ModuleChip block diagram of the internal protection circuit shown in Figure 3. The circuit includes control logic circuit, sampling circuit, overcharge detection circuit, over-discharge detection comparator, overcurrent detection comparator, load short-circuit detection circuit, level-shifting circuit and reference circuit (BGR).Figure3 Block diagram of battery protectionThis module constitutes a protection circuit shown in Figure 4. Under the chip supply voltage within the normal scope of work, and the VM pin voltage at the overcurrent detection voltage, the battery is in normal operation, the charge and discharge control of the chip high power end of the CO and DO are level, when the chip is in normal working mode. Larger when the battery discharge current will cause voltage rise of the VM pin at the VM pin voltage at above the current detection voltage Viov, then the battery is the current status, if this state to maintain the tiov overcurrent delay time, the chip ban on battery discharge, then the charge to control the end of CO is high, the discharge control side DO is low, the chip is in the current mode, general in order to play on the battery safer and more reasonable protection, the chip will battery over-discharge current to take over the discharge current delay time protection. The general rule is that the over-discharge current is larger, over the shorter the discharge current delay time. Above Overcharge detection voltage, the chip supply voltage (Vdd> Vcu), the battery is in overcharge state, this state is to maintain the corresponding overcharge delay time tcu chip will be prohibited from charging the battery, then discharge control end DO is high, and charging control terminal CO is low, the chip is in charging mode. When the supply voltage of the chip under the overdischarge detection voltage (Vdd <Vdl,), then the battery is discharged state, this state remains the overdischarge delay time tdl chip will be prohibited to discharge the battery at this time The charge control side CO is high, while the discharge control terminal DO is low, the chip is in discharge mode. Sampling circuitOver discharge detection comparatorControl logic circuit Level conversion circuit Overcharge detection comparator Over-current detection comparator2 Over-current detection comparator1Over-current detection circuitLoad short detection circuitFigure4 Protection circuit application schematic diagram4.Circuit DesignTwo charge protection module structure diagram, the circuit can be divided into four parts: the power detection circuit (under-voltage detection circuit), part of the bias circuit (sampling circuit, the reference circuit and bias circuit), the comparator (including the overcharge detection /overdischarge detection comparator, over-current detection and load short-circuit detection circuit) and the logic control part.This paper describes the under-voltage detection circuit (Figure 5), and gives the bandgap reference circuit (Figure 6).Figure5 Under-voltage detection circuitProtectionmoduleBiasing circuit Reference circuit Bleeder circuit difference amplifier Output circuitAmplifierAmplifierFigure6 A reference power supply circuit diagramBattery charging, voltage stability is particularly important, undervoltage, overvoltage protection is essential, therefore integrated overvoltage, undervoltage protection circuit inside the chip, to improve power supply reliability and security. And protection circuit design should be simple, practical, here designed a CMOS process, the undervoltage protection circuit, this simple circuit structure, process and easy to implement and can be used as high-voltage power integrated circuits and other power protection circuit.Undervoltage protection circuit schematic shown in Figure 5, a total of five components: the bias circuit, reference voltage, the voltage divider circuit, differential amplifier, the output circuit. The circuit supply voltage is 10V; the M0, M1, M2, R0 is the offset portion of the circuit to provide bias to the post-stage circuit, the resistance, Ro, determine the circuit's operating point, the M0, M1, M2 form a current mirror; R1 M14 is the feedback loop of the undervoltage signal; the rest of the M3, M4 and M5, M6, M7, M8, M9, M10, M11, M12, M13, M14, composed of four amplification comparator; M15, DO, a reference voltage, the comparator input with the inverting input is fixed (V+), partial pressure of the resistance R1, R2, R3, the input to the inverting input of the comparator, when the normal working of the power supply voltage, the inverting terminal of the voltage detection is lost to the inverting terminal voltage of the comparator is greater than V+. Comparator output is low, M14 cutoff, feedback circuit does not work; undervoltage occurs, the voltage divider of R1, R2, R3, reaction is more sensitive, lost to the inverting input voltage is less than V when the resistor divider, the comparator the output voltage is high, this signal will be M14 open, the voltage across R into M at both ends of the saturation voltage close to 0V, thereby further driving down the R1> R2, the partial pressure of the output voltage, the formation of the undervoltage positive feedback. Output, undervoltage lockout, and plays a protective role.5. Simulation results and analysisThe design of the circuit in CSMC 0.6 μm in digital CMOS process simulation and analysis of the circuit. In the overall simulation of the circuit, the main observation is that the protection module on the battery charge and discharge process by monitoring Vdd potential and Vm potential leaving chip CO side and DO-side changes accordingly. The simulation waveform diagram shown in Figure 7, the overall protection module with the battery voltage changes from the usual mode conversion into overcharge mode, and then return to normal working mode, and then into the discharge mode, and finally back to normal working mode. As the design in the early stages of the various parameters to be optimized, but to provide a preliminary simulation results.Figure7 Overvoltage and under-voltage protection circuit simulation waveform6.ConclusionDesigned a set of battery charging and protection functions in one IC. This design not only can reduce the product, they can reduce the peripheral circuit components. The circuit uses the low-power design. This project is underway to design optimization stage, a complete simulation can not meet the requirements, but also need to optimize the design of each module circuit.光伏系统中蓄电池的充电保护IC电路设计曾德友，凌朝东，李国刚1.引言太阳能作为一种取之不尽、用之不竭的能源越来越受到重视。