摘要
文章研究了直流输电系统中针对换相失败的阀控策略,指出现有控制策略在临界条件下存在极控系统检测不到交流低电压信号,VBE无法闭锁回检信号的检测而造成跳闸的隐患。通过详细分析网内交流系统故障导致换流站直流换相失败而闭锁的故障过程,进一步验证现有阀控策略的隐患。文章最后针对采样回路进行优化。
This paper analyses End of Current Failure corresponding valve control strategy in HVDC. It is pointed out that a potential risk existed which can causes check-back signal can＇t be decteted by VBE and causes HVDC tripping in existing control strategy when low AC voltage cannot be detected by pole control systems under some critical conditions. Then this paper analyzes a HVDC tripping accident caused by AC system fault in order to validate this control strategy risk. In the last part of this paper, optimization of sampling circuit is proposed.
出处
《电气技术》
2016年第7期96-100,共5页
Electrical Engineering
关键词
换相失败
低电压检测
回检信号
采样回路
阀控策略
end of current failure
low voltage detection
check-back signal
sampling circuit
valve control strategy
