实验3(陈洛忠缩小版)

Figure 3. Wave of Triggering signal in the primary side of A phase pulse transformer
The insulated and strong triggering signal for each SCR can be given through the driving circuit seen in Figure 4.
Complete the experiment of three-phase Thyristor controllable converter operating in two-quadrant by oneself
Purpose：
Know the true circuits and connections, observe and analyse the main waveforms of circuit
Problems 1. How dose ac side inductance effect on the current commutation in this converter circuit? 2. How can this Thyristor controllable converter operate in inverter mode?Try to analyse the reasons. 3. If one Thyristor is fault,how can you choose this one?
Steps of the experiment (con.) 5. Modulate the voltage of second side in singlephase transformer near 200 V, then turn the controller of α respectively in 120º and 150º, observe and draw the waveforms of Ud, Id,UT and triggering signal too; 6. Turn off the utility power and modulate the transformers to zero after the teacher admitriving circuit A general control circuit board named CA6100, which composed of Large Scale Integration (PSI) is used in this experiment. The CA6100 is seen in Figure 1.
Request：
Step by step safely Do it by oneself Draw carefully waveforms Analyse rightly conclusion
Introduction of the experiment circuit
DC output
K
G
A
Understand the request of triggering signal for three-phase Thyristor Full-bridge controllable converter
See the attached《CA6100可控硅触发电路》
Content：
Figure 4. Driving circuit for A phase
Figure 5. Wave of Triggering signal in the second side of A phase pulse transformer
Steps of the experiment 1. Check the all equipments and connections in the circuit; 2. Modulate the single-phase transformer to zero voltage; 3. turn on the utility power, the three LED light in CA6100; 4. Modulate the voltage of second side in threephase transformer below 80 V, then turn the controller of α respectively in 0º,60º and 90º ,observe and draw the waveforms of Ud, Id,UT and triggering signal;
Figure 1. CA6100
Control part
Driving part
Output ports Six pulse transformers Power supply Power transformer Controler of a
LSI
One important feature of CA6100 is that a phase-lock-loop (PLL) is ability to provide the synchronous triggering signal with AC input voltage for SCR, instead of a synchronous transformer. The principle of triggering signal is seen in Figure 2.
Prepare this experiment
Draw the topology of three-phase Thyristor Full-bridge controllable converter Summarize the basic principle of three-phase Thyristor Full-bridge controllable converter when it operates in two-quadrant
Experiment 3. Three-phase Thyristors Converter
This experiment will begin from 2011-5-24 For the three-phase Thyristor Full-bridge circuit can operate in two-quadrant, i.e. rectifier mode and inverter mode, converter is called in this experiment, instead of rectifier.
Figure 2. principle of triggering signal
Two types of triggering signal can be provided in the primary side of every pulse transformer in CA6100, which can be seen in Figure 3. The double 30o of them is used in this experiment.