二控三型TSC快速重复投切晶闸管闭锁问题研究

摘要

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.%基于零过渡投切原则,对低压配电系统常用的二控三型TSC装置电容器组快速重复投切时出现晶闸管闭锁现象的发生过程进行了详细地分析,并对发生该现象的概率进行了计算。结合实际情况分析了电容器组损耗、放电电阻及残压等参数对重复投切时间响应的影响,并对防止出现晶闸管闭锁现象提出了解决方法,提高了TSC装置的响应速度和可靠性。通过仿真和实验对上述理论研究结果进行了验证,为设计快速响应的TSC装置提供了依据。