低压TSC切除时承压分析和防同极性迭加控制  

The Withstand Voltage Analysis and Same Polarity Anti-superposition Control during LV TSC Removal

作　　者：曾亚波[1] 

机构地区：[1]中南大学交通运输工程学院,湖南长沙410075

出　　处：《电力电容器与无功补偿》2009年第5期22-25,共4页Power Capacitor & Reactive Power Compensation

摘　　要：为解决晶闸管切除电容器组时易产生过压击穿问题,根据三相电路特性分析了晶闸管切除电容器组时的工作过程。结果表明,两次换流过程可在电容器上形成同极性或异极性剩余电压迭加。同极性迭加时剩余电压高达1.366倍电网峰值电压,使先切除的晶闸管承受2.366倍电网峰值电压,而异极性迭加电容器上只有0.366倍电网峰值电压。据此得出在正序和负序连接下的TSC切除电压异极性迭加的控制算法,分析和应用都证明了控制算法的有效性。To solve SCR over voltage breakdown problem, this paper analyzes process of switching capacitor bank by thyristors in 3-phase power lines. The analysis results show that through two times current alternating the same polarity or reversed polarity voltage superposition on capacitor bank could be formed. If the same polarity voltage added the capacitor bank＇s residual voltage up to 1. 366 times of peak voltage of power network , thus will cause 2. 366 times peak voltage of power network on first off thyristor. While reversed polarity voltage is added, the capacitor bankg residual voltage is 0.366 times of peak voltage of power network. So, the reversed polarity control method of TSC switching off for positive-sequence or negative-sequence connecting is obtained. Analysis and application verify its validity.

关 键 词：低压TSC 晶闸管投切电容器 防迭加控制 复合开关 

分 类 号：TM761[电气工程—电力系统及自动化]