限流电抗器对输电线路工频过电压的影响  

Effects of Current-Limiting Inductor on Power Frequency Overvoltages in Transmission Line

作　　者：陈水明[1] 王威[1] 杨鹏程[1] 

机构地区：[1]电力系统及发电设备控制和仿真国家重点实验室(清华大学),北京市海淀区100084

出　　处：《电网技术》2010年第3期193-196,共4页Power System Technology

基　　金：国家自然科学基金资助项目(50737001)~~

摘　　要：接入限流电抗器,可有效解决电力系统短路电流过大的问题,但同时也会影响断路器暂态恢复电压、输电线路工频过电压以及操作过电压的大小。利用电磁暂态计算软件PSCAD/EMTDC,研究了限流电抗器对输电线路工频过电压的影响。仿真结果表明:限流电抗器的引入,使得由空载输电长线路的电容效应、不对称短路以及甩负荷引起的工频过电压增大至1.29pu,略低于行业标准限值1.3pu。建议在安装限流电抗器之前,对线路工频过电压进行校核,以保证运行安全。Current-Limiting Inductor （CLI） is used to limit the magnitude of fault current in power systems. Meanwhile, the introducing of CLI will change the transient recovery voltage （TRV） of circuit breaker, power frequency overvoltage and switching overvoltage of transmission line. Simulations by PSCAD/EMTDC are carried out to get the effect of CLI on power frequency overvoltages. Simulation results show that configuring CLI will make power frequency overvoltage, caused by capacitance effects of long distance transmission line, asymmetry grounding faults and load rejection of line, rising up to 1.29 pu, namely slightly lower than the limit 1.3 pu specified in industrial standard. It is recommended that check of line overvoltage should be done before CLI is installed in transmission line.

关 键 词：工频过电压 电容效应 不对称短路 甩负荷 限流电抗器 

分 类 号：TM726.3[电气工程—电力系统及自动化]