基于双端电气量的配电线路故障定位方法

配电线路的故障定位技术对维护电力系统的稳定运行起到了重要作用。文章以R-L线路模型为基础,提出了一种基于电压、电流正序分量的配电线路故障定位方法,该方法首先对配电线路两端测量点的电压、电流相量进行检测,得到正序电压、电流相量矩阵,然后结合线路故障系数矩阵及线路阻抗参数建立定位函数,实现故障定位。仿真实验表明,该方法计算量小,受故障电阻、故障位置等因素影响较小,鲁棒性好,对配电网线路故障定位的精度较高,具有广泛的应用前景。

Fault location of distribution line method based on two-terminal electrical power quantities

Fault location technology of distribution lines plays an important role in maintaining the stable operation of power system. In this paper, based on the R-L circuit model, a fault location method based on voltage and current positive sequence components is proposed .Firstly, the voltage and current phasors of the measurement points at both ends of the distribution line are detected, and the positive sequence voltage and current phasors matrix are obtained, and then combined with the line fault coefficient matrix and line impedance parameters to establish the positioning function to achieve fault location. The simulation results show that the proposed method has the advantages of small computation, little influence by fault resistance and fault location, good robustness, high accuracy for fault location of distribution network and it has a good application prospect in fault location of distribution network.