针对两相短路故障的时间窗自动提取算法设计

Abstract

本文针对输电线路两相短路故障，提出了一种基于工频分量单端故障测距原理的时间窗提取算法。此算法利用故障电流的差值对时间窗进行定位。首先利用PSCAD/EMTDC仿真软件搭建输电线路分布参数模型，对输电线路发生两相短路故障进行仿真建模，然后将仿真结果导入MATLAB，最后利用所提时间窗自动提取算法对故障点进行定位。经过对测距结果的分析，本文所提时间窗自动提取算法在输电线路发生两相短路故障后能有效对时间窗进行提取，可以为微机保护装置时间窗的快速准确选取提供参考。 This paper proposes a new time window automatic extraction algorithm of two phase short circuit fault based on power frequency component of the single-ended ranging principle. The time window automatic extraction algorithm is based on the differences of the phase current of fault phase to locate the time window. First, the transmission line distributed parameter model is built by using PSCAD/EMTDC simulation software to simulate two-phase short circuit fault. Then, the results of the two-phase short circuit fault simulation are used to the input of MATLAB. Finally, the algorithm proposed in this paper is used to locate the fault point. The result of the fault location verifies that the algorithm is feasible. The algorithm proposed in this paper can effectively extract the time window of two phase short circuit fault which can provide reference to the microcomputer protection device.