特高压换流站交流滤波电容器组不平衡保护故障研究

Study on Unbalance Protection Fault of AC Filter Capacitor Bank of UHV Converter Station

交流滤波器作为特高压直流输电工程关键组成部分,扮演着调节电压、提供无功补偿的角色,其安全稳定运行至关重要。针对某换流站交流滤波器组发生不平衡保护动作,通过介绍该站交流滤波器配置情况,结合故障电流的分布特点,对交流滤波器C1电容器不平衡异常进行了分析。为了提高现场运维人员处理故障效率,提出了一种故障电容器组定位方法,该方法可精确定位双H桥的1/6区域,解决了电容器组不平衡保护的故障定位难题,对特高压换流站可靠运行具有实际参考价值。

As a key component of UHVDC transmission engineering,AC filters play a role in regulating voltage and providing reactive power compensation,and their safe and stable operation is crucial.In view of the unbalance protection of the AC filter bank of a converter station,the unbalance abnormality of the AC filter C1 capacitor of the AC filter is analyzed by introducing the configuration of the AC filter of the station and combining the distribution characteristics of the fault current.In order to improve the fault handling efficiency of field operation and maintenance personnel,a kind of positioning method of fault capacitor bank is proposed,which can accurately locate the 1/6 area of the double H bridge,has solved the fault location problem of unbalance protection of the capacitor bank and has practical reference value for the reliable operation of the UHV converter station.