交流滤波器C1不平衡保护动作分析

Analysis of AC Filter C1 Unbalanced Protection

兴安直流输电工程小组交流滤波器保护主要采用计数方法来判断故障等级。结合换流站小组交流滤波器C1不平衡保护原理,对兴安直流输电工程宝安换流站多组小组交流滤波器C1不平衡保护相继动作的原因进行分析,并针对动作原因,对C1不平衡保护定值的大小和逻辑提出优化策略,最后采用多种方法开展现场试验,验证定值优化策略的正确性。

The method of counting to judge the fault level was adopted in Xing′an DC project AC filter protection.Combined with AC filter C1 unbalance protection principle of converter station,reasons for successive actions of C1 unbalanced protection of multi-group AC filters in Baoan Converter Station of Xing′an HVDC Project were analyzed.Aiming at the reason of action,the optimization strategy for the C1 unbalance protection value and logic of C1 unbalanced protection were proposed.A variety of methods were adopted to carry out field tests,which verified the correctness of value optimization strategy.