摘要
某高压直流输电(HVDC)换流站发生闭锁事故,事故是由于阀冷系统循环水泵变频器不具备高低电压穿越能力造成的。根据循环水泵的启动运行方式及变频器AC/DC/AC的特性,从变频器的直流环节入手,提出基于直流支撑技术的低电压穿越改进技术,通过直流支撑系统和变频器直流环节的改造还可以实现变频器的高电压穿越。
The causes of a HVDC converter station forced blocking accident are found out,which are the frequency converter of water circulating pump in valve cooling system without the capability of high and low voltage ride through capabilities. According to the starting and operation modes of water circulating pumps and AC/DC/AC characteristics of frequency converter,measures to improve the low voltage ride through capability of frequency converter based on DC support technology is put forward.Meanwhile,high voltage ride through capability could be achieved by the reconstruction of the DC support system and the DC link of frequency converter.
出处
《供用电》
2016年第3期25-28,33,共5页
Distribution & Utilization
关键词
换流站
闭锁
变频器
直流支撑技术
高电压穿越
低电压穿越
converter station
blocking
frequency converter
DC support technology
high voltage ride through
low voltage ride through
