带并联电抗器的双回线故障测距算法研究

超、特高压输电线路为了补偿线路的容性充电功率,控制无功潮流,稳定网络运行电压,限制潜供电流等,一般要安装并联电抗器。由于并联电抗器的安装,直接测取双回线两端母线处的电压及线路流过的电流进行测距,必然会引起误差。采用基于反序网的双端量算法进行故障测距,并根据并联电抗器的特点消除其影响。该测距方法在原理上不受线间互感、过渡电阻、分布电容、不同步角的影响。仿真结果表明其具有较高的计算精度。

Research on Accurate Fault Location Algorithm for Double Circuit Transmission Line with Shunt Reactors

In order to compensate for the capacitive charging power of transmission lines,control reactive power flow,stabilize operating voltage and restrict arc current,the shunt reactors are usually installed on EHV transmission lines,especially for UHV transmission lines.In fault state,a double circuit transmission line can be decoupled into common sequence component network and differential sequence component network.Considering the characteristics of shunt reactors,this paper proposes an accurate fault location algorithm based on differential sequence component network,which only uses the currents at two terminals of a transmission line.Its accuracy can not be affected by coupled inductance,fault resistance,distributed capacitance and asynchronous angle.Theory analysis and ATP simulation test show that the proposed method has high accuracy.