矿井电网故障选线方法研究

摘要

针对矿井电网附加直流源系统发生单相接地故障时故障线路暂态零序电流的直流分量大于非故障支路的特征,提出了一种基于最小二乘矩阵束算法和Romanovsky准则的矿井电网故障选线方法.采用最小二乘矩阵束算法提取故障暂态零序电流中的直流分量,将各支路的直流分量组成矩阵;再采用Romanovsky准则进行判别:当绝对离差大于临界差时,判为支路故障,剔除数据支路即是故障支路,否则为母线故障.仿真结果表明,该选线方法准确、可靠,具有较强的适应性.%In view of characteristics of DC component of transient zero-sequence current in fault lines is larger than that of normal lines when additional DC source system of mine power network occurrs singlephase earth fault,a fault line selection method of mine power network based on least-square matrix pencil algorithm and Romanovsky criterion was presented.The method uses least-square matrix pencil algorithm to extract DC component of transient zero-sequence current,and the DC component of each line is formed matrix.Then,it uses Romanovsky criterion to judge fault.If the absolute dispersion is larger than the critical dispersion,it is the line fault,the rejected data branch is the fault line,otherwise it is the buses fault.Simulation results show that the method is accurate,reliable with high adaptability.