基于10 kV高压自取能光电触发TSC装置的延时触发角谐波分析

Harmonic Analysis of Firing Angle Delay Based on Self-power Supply Optical Trigger 10 kV High-voltage TSC Device

高压晶闸管投切电容器(TSC)无功补偿装置作为传统高压无功补偿装置在高压领域应用较为广泛,但因其晶闸管全导通时阀组端电压为0,无法从阻尼回路中取能用于晶闸管触发,故自取能光电触发电路一直是研究攻克的难点。为解决这一难题,自主研制了一套基于自取能光电触发10 kV高压TSC装置,通过延迟一定的触发角度实现晶闸管触发电路的自取能。但TSC与TCR不同,当存在延迟角时必然会因du_c/dt的影响引起冲击电流,造成触发脉冲的紊乱。因此,为了抑制冲击电流,在实际使用中必须配置电抗器。通过理论和仿真分析了TSC触发脉冲延迟角及电抗器与谐波含量的关系。

Taking high-voltage thyristor switched capacitor（TSC） reactive power compensation device as a conventional high-voltage reactive power compensation device is widely used in high-voltage areas. but because the thyristor is turned on completely,valve terminal voltage is zero, which can not be taken from the damping circuit and be used to trigger thyristors,so self-power supply optoelectronics trigger circuit has been a hot research to overcome the difficulties. In order to solve this problem, our research group independently developed a set device based on self-power supply photoelectric trigger 10 kV high-voltage TSC to achieve self-power supplying of the thyristor trigger circuit through delaying a certain angle. But TSC is different from TCR when there is bound to cause a surge current due to the impact of the firing angle delay according to duc/dt,causing the trigger pulse disorder. Therefore,in order to reduce surge current,it must be configured reactor in actual use. This paper analyzes the relationship between TSC trigger pulse delay angle and reactor and the harmonic content through the theoretical and simulation.