两起双系统多次换相失败导致的闭锁事件分析

Analysis of Two Blocking Events Caused by Multiple Commutation Failures of Dual Systems

换相失败是影响直流工程受端电网安全稳定运行的重要因素。结合南桥站两起双系统多次换相失败导致的直流闭锁事件,对换相失败原理、换流阀触发脉冲误发全路径进行了详细分析,在此基础上排查了事故原因,并为相关直流换流站阀触发脉冲回路器件运行全周期提供了指导。

Commutation failure is an important factor affecting the safe and stable operation of the receiving-end power grid in DC projects.Combined with the DC blocking events caused by the repeated commutation failures of dual-systems in Nanqiao Substation,this paper analyzed the principle of commutation failures and the full path of the triggered pulse by the converter valve.Thereupon,the causes of the accident are investigated,which provides guidance for the full operation cycle of the valve-triggered pulse circuit devices in the corresponding DC converter stations.