换流站交流滤波器用避雷器频繁动作原因分析

换流站小组交流滤波器投入时,由于不可能准确在电压过零点时刻合闸,会对系统造成不同程度的暂态冲击,引起避雷器的频繁动作、老化。通过现场监测、录波分析、PSCAD仿真等手段对交流滤波器用避雷器频繁动作原因进行分析。结果表明,实际工程中避雷器频繁动作是由于滤波器合闸时刻与过零点偏差较大所致。某小组交流滤波器的合闸冲击会导致本小组避雷器动作,同时引起同类型其他组避雷器动作,过电压的大小随合闸偏离角度及直流输送功率的变化而变化。

Analysis of Reasons for the Frequent Action of Arrester in AC Filter in Converter Station

The power system is affected by different levels of transient shock caused by the different switching angle the AC filter switching on. The shock cause frequent action and aging of lightning arrester. The causes of frequent action of lightning arrester are analyzed by means of field monitoring, recording wave analysis and PSCAD simulation. The results show that the frequent action of the arrester is caused by the large deviation of the filter closing time. The closing impact of one group AC filter will lead to the action of the arrester in this group, and the other arrester in groups of the same type AC filter. The amplitude of overvoltage varies with the switching Angle and the transmission power of HVDC.