文章翻译

河北师范大学本科生毕业论文（设计）翻译文章

能源来自可再生能源已成为非常重要，主要是因为温室气体产生的贡献可以忽略不计。然后出现的问题是如何将这些新的来源于一个传统的电网，以最大限度地提高效率，这种新的分布式发电（DG）系统的可靠性。硬件做，通常是一个电压源逆变器（VSI）提供一个共同的负载，如单相住宅和商业应用。过程优化的要求，当然，这样的权力分析。本文介绍了单相并网逆变器，包括用于控制实现现场可编程门阵列处理器的功耗分析的功率控制系统的实验评价发展（FPGA）电路。自适应线性神经网络的新的硬件结构（ADALINE）允许的功率控制算法的实现，也允许的高阶谐波实时分析不增加的FPGA电路实现地区。这些特点是理想的新的DG的电力电子接口，不仅可用于有源电力调度也为谐波功率补偿。所提出的固定和可变频率方案的仿真和实验结果验证其有效性。

与目前广泛使用的恒定开关频率的脉冲宽度调制（PWM）方法相比，可变开关频率PWM能获益更多，因为额外的自由。通过对三相变流器的电流纹波的解析表达式，提出了满足不同的可变开关纹波要求的频率控制方法。循环切换T-S更新每个中断期间基于DSP的纹波的要求。两种方法进行了讨论。第一种方法是设计来在一个特定值的电流纹波峰值和安排可以降低等效开关频率和电磁干扰（EMI）噪声；第二种方法的目的是让纹波电流有效值恒定，降低EMI噪声。仿真和实验结果表明，可变开关频率控制可以改善EMI性能和效率而不影响电能质量。

英文文献

Energy coming from renewable sources has become very important nowadays, mainly because of their negligible contribution to greenhouse gas generation. A problem that then arises is how to integrate these new sources into a traditional power grid, in such a manner as to maximize the efficiency and reliability of this new distributed generation (DG) system. The hardware to do that is generally a voltage source inverter (VSI) that supplies a common load, as in single-phase residential and commercial applications. The optimizing process requires, of course, the usual power analysis. This paper presents the development and the experimental evaluation of a power control system for a single-phase grid-connected VSI including the power analysis using as processor for the control implementation a field-programmable gate array (FPGA) circuit. New hardware structures of adaptive linear neural networks (ADALINE) allow the implementation of power control algorithms and have also permitted the real-time analysis of the high-order harmonics without increasing the implementation area of the FPGA circuit. These features are ideal for novel DG power electronics interfaces that could be used not only for active power dispatch but also for harmonics and reactive power compensation. Simulation and experimental results of the proposed fixed and variable frequency schemes are included to confirm their validity.

Compared with the widely used constant switching frequency pulse-width-modulation (PWM) method, variable switching frequency PWM can benefit more because of the extra freedom. Based on the analytical expression of current ripple of three-phase converters, variable switching frequency control methods are proposed to satisfy different ripple requirements. Switching cycle T-s is updated in DSP in every interruption period based on the ripple requirement. Two methods are discussed in this paper. The first method is designed to arrange the current ripple peak value within a certain value and can reduce the