基于Hausdorff距离的配电网单相接地故障选线方法

Single-phase Grounding Fault Line Selection Method for Distribution Network Based on Hausdorff Distance

现有的暂态量选线法易受复杂故障条件影响。提出了一种以故障暂态零序电流差异程度为判据的选线方法,利用Hausdorff距离算法,对线路零序电流间的不匹配度进行求解。构造了不匹配度矩阵,进而得到线路的不匹配度和与不匹配度商,以表征线路零序电流间的差异程度。当不匹配度商低于阈值时,判定母线故障;反之,则判定不匹配度和的最大值对应的线路故障。仿真及实例验证结果表明,该方法能够准确地对母线故障与馈线故障进行区分,且不受复杂故障因素的影响。

The existing transient line selection methods are vulnerable to complex fault conditions. In this paper,a fault line selection method is proposed based on the criterion of difference degree between zero-sequence currents in the fault transient state. Hausdorff distance algorithm is used to calculate the mismatch degree between zero-sequence currents.A matrix of mismatch degree is constructed,so that the mismatch degree of lines and the quotient of mismatch can be obtained to characterize the difference between zero-sequence currents. When the quotient of mismatch is lower than the threshold,the bus fault can be judged;otherwise,the line corresponding to the maximum value of sum of mismatch degrees can be judged to be under a fault condition. Simulation results of a practical example show that this method can accurately distinguish bus fault from feeder fault,and it is not affected by complex fault factors.