摘要
中性点不接地配网系统中,由单相接地故障引发低频振荡,进而导致电压互感器(potential transformer,PT)爆炸的事故时有发生,严重影响配网系统的安全运行。分析了低频振荡导致PT爆炸的机理,并利用电力系统仿真软件PSCAD-EMTDC对10 k V PT进行仿真。在此基础上提出了一种基于绝缘栅双极型晶体管(insulated gate bipolar transistor,IGBT)控制的复合式消谐措施,并通过仿真验证了此种消谐措施能够抑制过电压的产生,将励磁电流及零序电压控制在安全范围内,从而有效地解决了由低频振荡引起的电压互感器爆炸问题。
In power distribution system with ungrounded neutral, low frequency oscillation caused by single phase to ground fault frequently induces explosion of potential transformer（PT）, seriously threatening safe operation of distribution network. In this paper, PT explosion mechanism caused by low frequency oscillation was analyzed and PSCAD-EMTDC was used to simulate potential transformer. A compound resonance elimination method based on insulated gate bipolar transistor（IGBT）was proposed. Simulation results showed that the resonance elimination measures could restrain overvoltage generation, and exciting current and residual voltage could be controlled within a safe range, so that it could effectively solve the problem of potential transformer caused by low frequency oscillation.
出处
《电网技术》
EI
CSCD
北大核心
2016年第8期2451-2455,共5页
Power System Technology
基金
山东省中青年科学家奖励基金资助项目(BS2013DX012)~~
关键词
电压互感器
低频振荡
仿真
消谐
potential transformer
low frequency oscillation
simulation
resonance elimination
