Abstract：In this paper, a detailed theoretical analysis of thyristor latch-up when capacitor banks of low-voltage TSC switched repeatedly is presented and the probability of the latch-up is calculated. The effect of capacitor losses, discharge resistance and residual voltage of the capacitors on response time is analyzed in practical application. A control strategy is proposed to avoid the thyristor latch-up, and the response speed and reliability of the device are increased. Simulation and experimental results verify the theoretical analysis and show that the control strategy is feasible and efficient.
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2012, Vol. 27 
