高压直流输电系统连续换相失败研究综述

Review of consecutive commutation failure research for HVDC transmission system

高压直流输电系统连续换相失败是引发交直流混联电网连锁故障的重要诱因,换相失败的本质原因是晶闸管没有自关断能力。因交流故障难以预测,首次换相失败难以避免,但首次换相失败演化为连续换相失败的过程受高压直流控制系统快速跳变和交流系统继电保护动作的影响。分析了高压直流连续换相失败的演化机理,介绍了判别连续换相失败的方法,归纳了连续换相失败的处理方式,并对其特点进行了分析。

The cascading fault caused by consecutive commutation failures of HVDC system is a serious problem in AC/DC hybrid power grid, and the lack of self-turn-off ability for thyristors is the essential reason causes commutation failure. AC fault is difficult to predict and the initial commutation failure is inevitable, while both the rapid hop of HVDC control system and relay protection action of AC system affect the initial commutation failure evolving into consecutive commutation failure. The evolution mechanism of HVDC consecutive commutation failure is analyzed, the method to distinguish the consecutive commutation failure is demonstrated, the mitigation methods of consecutive commutation failure are summarized, and the characteristics of above methods are analyzed.