基于小波变换的含分布式电源配电网单相接地故障选线  

Single-phase Grounding Fault Line Selection in Distribution Network with Distributed Generation Based on Wavelet Transform

作　　者：吴璐子 WU Luzi(Office of Laboratory and Facility Management,Minjiang University,Fuzhou,Fujian 350108,China)

机构地区：[1]闽江学院实验室与设备管理处,福建福州350108

出　　处：《闽江学院学报》2023年第5期81-90,共10页Journal of Minjiang University

摘　　要：分布式电源(distributed generation,简称DG)接入导致传统配电网故障选线算法适用性受限,通过零序电流特征分析,利用小波包细节分解算法高阶细节分量DD5,提出基于首端零序电流突变量与突变极性比较的双重选线判据,在PSCAD/EMTDC上搭建含分布式电源配电网仿真模型,验证所述方法在单相接地故障时能够准确定位故障线路,具备一定的耐过渡电阻能力,且方法同样适用于无源配电网。The access of distributed generation(DG)leads to the limitation of the applicability of the traditional fault line selection algorithm for distribution network.Through the analysis of zero-sequence current characteristics,using the high-order detail component DD5 of wavelet packet detail decomposition algorithm,a double line selection criterion based on the comparison of the zero-sequence current mutation and the mutation polarity at the head end is proposed.The simulation model of distribution network with distributed generation is built on PSCAD/EMTDC.It is verified that the method described in this paper can accurately locate the fault line when single-phase ground fault occurs,and has a certain ability to withstand transition resistance,and the method is also suitable for passive distribution network.

关 键 词：分布式电源(DG) 小波分析 单相短路 故障选线 

分 类 号：TM773[电气工程—电力系统及自动化]