改进式晶闸管串联调压电容无功补偿装置的断态过电压仿真  

Simulation of thyristor off-state over-voltage in improved capacitor var compensation device of thyristor series voltage regulation

作　　者：王世蓉[1] 李民族[1] 唐晓玲[1] 

机构地区：[1]贵州大学电气工程学院,贵州贵阳550003

出　　处：《电力自动化设备》2006年第9期34-38,共5页Electric Power Automation Equipment

基　　金：贵州省2005年度重点科学技术项目资助(黔科合GY字(2005)3019)

摘　　要：改进式晶闸管串联调压电容无功补偿装置的晶闸管开关带电断开时,要承受危险的断态过电压,为保证装置的安全运行,阐述了晶闸管断开时过电压产生的原理及状态。对装置投入、换级以及故障等各种工况下断态过电压的大小进行了理论分析,用电磁暂态分析PSCAD/EMTDC软件对典型工况的断态过电压进行了仿真分析。采用氧化锌压敏电阻过压保护后,重新对严重故障时的断态过电压进行了仿真。结果表明,装置投入、换级等正常操作时,晶闸管开关断态过电压不高;但在装置故障时,会出现严重过电压,若过压保护动作后,断路器在0.1s内跳闸,压敏电阻通流容量不很大。The thyristor in the improved capacitor var compensation device of thyristor series voltage regulation endures unsafe off-state over-voltage when it switches off on line. To ensure its safe operation,the principle and conditions of the over-voltage generated under off-state of thyristor are explained. States of off-state over-voltage is analyzed theoretically under different device working conditions,such as put-in,tap change and faults. Simulation results with PSCAD/EMTDC software are presented for typical working conditions. For serious fault conditions,the simulation is redone with ZnO varistor over-voltage protection being adopted. Results show that the off-state over-voltage of thyristor is not high for normal operations, such as put-in and tap change,but when there is fault in the device,serious off-state over-voltage will occur. If circuit breaker trips within 0.1 s after the over-voltage protection acted,the current passing ZnO varistor is not high.

关 键 词：串联调压 无功补偿装置 晶闸管开关 断态过电压 压敏电阻 EMTDC 

分 类 号：TM761.12[电气工程—电力系统及自动化]