南方电网直流换相失败机理及判别方法*

换相失败是高压直流输电系统最常见的故障之一。对导致换相失败的因素进行了分析,指出交流系统故障、丢失触发脉冲或门极控制回路故障、阀发生误触发、逆变器发生阀短路等是导致换相失败的主要因素。介绍了西门子和ABB两种技术路线在南方电网直流工程中的控制保护的应用情况。最后,提出一种通过TFR故障录波判断是否发生换相失败的方法,为各直流工程运行维护人员提供参考。

The Mechanism and Discrimination Method of HVDC Commutation Failure in China Southern Power Grid

Commutation failure is one of the most common faults of HVDC transmisson system. This paper analyzes the factors that lead to commutation failure, pointing out that the main factors are the AC system fault, the loss of the trigger pulse or gate valve con- trol circuit fault, and error occurred in the inverter valve short circuit. The two technical routes from Siemens and ABB for control pro- tection in DC projects in CSG are introduced. Finaily, a recognition method of HVDC commutation failure with TFR is nronosed.