Switching on of group filters at the converter station may cause different levels of transient impact on the system and frequent action and aging of the arrester. Therefore,this paper builds a simulation model for Nuozhadu DC transmission project by using PSCAD software and makes analysis and simulation on overvoltage,current and energy of the AC filter,and discusses reasons for frequent action of the arrester of AC filter. Corresponding results indicate switching on of the AC filter may produce impact in its own group filters and other group filters. As the closing phase of C type filter is 12°,the arrester of the own group filters acts,while when the closing phase is 18°,the arrester of the other group filters acts. Meanwhile, leading closing of a certain phase has no effect on overvoltage of the other phases,which means it can be considered three phases are in mutual independence.%换流站小组交流滤波器投入时,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,为此建立糯扎渡直流工程 PSCAD仿真模型,对交流滤波器投入时的过电压、电流、能量进行分析、仿真,探讨交流滤波器避雷器频繁动作原因.结果表明:交流滤波器投入时会在本小组交流滤波器及其他小组交流滤波器中产生冲击,C型滤波器的合闸超前相位达到 12°时本组交流滤波器避雷器动作,合闸超前相位达到 18°时其他组交流滤波器避雷器将会动作;同时,三相中某一相超前合闸对其他两相的过电压无影响,三相之间可以认为相互独立.
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