基于动态时间弯曲距离的主动配电网故障定位研究  

Research on Active Distribution Network Fault Location Based on Dynamic Time Warping Distance

作　　者：宋文宇 徐艳春[2] 左豪杰 席磊 MI Lu SONG Wenyu;XU Yanchun;ZUO Haojie;XI Lei;MI Lu(Hongshan Power Supply Center of State Grid Wuhan Power Supply Company,Wuhan,Hubei 430064,China;Electric and New Energy Institute,China Three Gorges University,Yichang,Hubei 443002,China;Department of Electrical and Computer Engineering,Texas A&M University,Texas 77840,USA)

机构地区：[1]国网武汉供电公司洪山供电中心,湖北武汉430064 [2]三峡大学电气与新能源学院,湖北宜昌443002 [3]德克萨斯农工大学电气与计算机工程学院,美国德克萨斯州77840

出　　处：《东北电力技术》2024年第10期26-33,共8页Northeast Electric Power Technology

基　　金：国家自然科学基金(52277108)。

摘　　要：针对含分布式电源(distributed generation,DG)的配电网发生小电流接地故障后,故障电流比较小、电气量特征不明显的特点,采用一种动态时间弯曲(DTW)距离算法对含DG的小电流接地系统进行故障定位。首先,分析系统发生单相接地故障后,故障线路与非故障线路暂态零序电流的特征,以及DG接入后暂态零序电流的影响;其次,通过引入DTW距离算法,测算线路两侧暂态零序电流的相似程度,计算DTW值,通过与设定的阈值进行比较可以准确识别出故障区段;最后,仿真结果表明,该方法在不同合闸角、不同接地方式、不同过渡电阻及不同容量DG的加入下,都能准确定位出故障区段。In view of the small current grounding fault in distribution network with distributed generation(DG),the amplitude of fault current is relatively small and the electrical characteristics are not obvious.It adopts the algorithm of dynamic time warping(DTW)distance to locate the fault in small current grounding system with DG.Firstly,after single-phase ground fault in the system,it analyzes the characteristics of transient zero sequence current of fault line and non fault line,as well as the influence of transient zero sequence current after DG connection.Secondly,it introduces the algorithm of DTW distance algorithm to measure the similarity degree of transient zero sequence current on both sides of the line,calculates and the DTW value.It can distinguishes the fault section accurately by comparing with the set threshold value.Finally,the simulations show that the proposed method can locate the fault section accurately with the different closing angles,the different grounding modes,the different transition resistances and the different capacities of DG.

关 键 词：配电网 小电流接地系统 分布式电源 暂态零序电流 动态时间弯曲距离 

分 类 号：TM714.3[电气工程—电力系统及自动化]