基于Matlab的输电线路故障测距仿真分析

Simulation analysis of transmission line fault location based on Matlab

为提高电力系统中故障测距结果的准确性,以便在第一时间找到故障点进行修复,利用Matlab软件对输电线路故障测距算法进行改进分析。首先利用差分算法提高傅里叶算法在衰减直流分量影响下的计算精度,并结合模拟低通滤波器提高差分傅里叶算法的工作性能;进而分析单端测距算法的工作原理和误差来源,并采用测量电抗值的方法,在低压均匀的输电线路中进行仿真分析;最后针对高压双端供电系统,对双端测距算法的工作原理和误差来源进行了仿真分析。通过对比故障测距算法在改进前后的仿真结果,证实了所建输电线路模型及其故障测距模型的正确性,以及对故障测距算法所做改进工作的有效性。

In order to improve the accuracy of fault location in power system,so as to find the fault point in the first time for repair,the fault location algorithm of transmission line is improved and analyzed by using Matlab.Firstly,the difference algorithm is used to improve calculation accuracy of Fourier algorithm under the influence of decaying DC component,and the performance of difference Fourier algorithm is improved by combining with analog low-pass filter.Then,the working principle and error source of the single-terminal location algorithm are analyzed,and the method of measuring the reactance value is used to simulate the low-voltage uniform transmission line.Finally,the working principle and error sources of the two-terminal location algorithm are analyzed and simulated for the high-voltage two-terminal power supply system.By comparing the simulation results of fault location algorithm before and after the improvement,the correctness of the transmission line model and its fault location model is verified,and the effectiveness of the improvement of the fault location algorithm is verified.