摘要
在中性点接地系统中,为抑制机械与电气系统之间可能发生的次同步谐振,在变压器高压绕组中性点与地之间接入阻塞滤波器。由于阻塞滤波器的接入,变压器中性点对地电压发生变化,尤其在发生故障时,变压器中性点电压的剧增可能对绝缘产生影响。文中基于托克托电厂500 kV升压站以及阻塞滤波器的实际数据,建立了PSCAD/EMTDC仿真模型。仿真发现了阻塞滤波器零阶电抗器不同补偿度及不同接地故障时阻塞滤波器的过电压规律,提出了通过零阶电抗器来抑制流过变压器中性点电流的方法,获得了零阶电抗器补偿度的设计值,并指出了阻塞滤波器绝缘保护的配置方法。
In the neutral point grounding system,in order to suppress the subsynchronous resonance that may occur between the mechanical and electrical systems,a blocking filter is connected between the neutral point of the transformer high voltage winding and the ground.Due to the connection of the blocking filter,the voltage of the transformer's neutral point to ground changes.Especially when a fault occurs,the surge in the voltage of the transformer's neutral point may affect the insulation.Based on the actual data of the 500 kV booster station and blocking filter of the Tuoketuo Power Plant,a PSCAD/EMTDC simulation model is established.The simulation discovers the over-voltage law of the blocking filter zero-order reactor at different compensation levels and different ground faults.A method of suppressing the current flowing through the transformer neutral point through a zero-order reactor is proposed,and the zero-order reactor is obtained.The design value of the compensation degree of the filter and the configuration method of the insulation protection of the blocking filter are pointed out.
作者
詹花茂
刘春江
ZHAN Huamao;LIU Chunjiang(North China Electric Power University,Beijing 102206,China)
出处
《南方电网技术》
CSCD
北大核心
2020年第9期24-28,共5页
Southern Power System Technology
