基于距离矩阵与分支系数的配电网故障定位方法  

Fault Location Method for Distribution Networks Based on Distance Matrix and Branch Coefficient

作　　者：谢李为 李勇[1] 罗隆福[1] 陈春[1] 曹一家[1] XIE Liwei;LI Yong;LUO Longfu;CHEN Chun;CAO Yijia(College of Electrical and Information Engineering,Hunan University,Changsha 410082,Hunan Province,China)

机构地区：[1]湖南大学电气与信息工程学院,湖南省长沙市410082

出　　处：《中国电机工程学报》2020年第7期2180-2191,共12页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51822702);湖南省科技重大专项(2017GK2241);长沙市杰出青年创新项目(KQ1707003)。

摘　　要：针对现有配电网故障定位算法存在实现复杂、经济性差等方面的不足,提出一种基于距离矩阵与分支系数的配电网故障定位方法。通过分析配电网的拓扑和故障行波的传输路径,定义配电网的有效支路和参考节点,计算故障发生前后的固有距离矩阵和故障距离矩阵差值,建立故障分支判定矩阵,得到相应的故障分支判定原理与定位方法。考虑配电网运行经济性,在行波采集装置最优配置的原则下,构建分支系数函数W实现非有效支路故障的准确判定,并通过改进的行波定位方法定位故障点。仿真结果表明,相比于现有配电网故障行波定位方法,所提方法简单易行,在配置有限数量的行波采集装置时仍能准确判定故障支路,实现故障点的精确定位,且定位结果不受故障类型和过渡电阻的影响,有助于提高现有行波定位方法的经济性,促进行波定位方法在配电网的工程应用。To solve the shortcomings of existing distribution network fault location methods,which are difficult to implement due to the complex algorithms or high costs,a fault location algorithm based on distance matrix and branch coefficient was proposed.By analyzing the topology of distribution network and the transmission path characteristics of fault traveling wave,the effective branch and reference nodes of the distribution network were defined.Before and after fault occurs,an inherent distance matrix(IDM)and a fault distance matrix(FDM)were established,and then calculating the difference between IDM and FDM to obtain the fault branch decision matrix(FBDM).A corresponding fault branch determination principle and a location method were proposed.Furthermore,considering the economical operation of distribution network,fault traveling wave detection devices were configured optimally.A branch determination function W was defined to realize the accurate determination of fault non-effective branch,and an improved traveling wave method was proposed to locate the fault point.Simulation results show that the proposed algorithm is simple and can be easily realized.Compared with existing location method for distribution networks,with a limited number of traveling wave detection devices,the proposed method can accurately determine the fault lines,and the location results are not affected by fault types and transition resistances.It can help to improve the engineering application of traveling wave location methods in distribution networks.

关 键 词：配电网 行波 故障定位 距离矩阵 分支系数 

分 类 号：TM77[电气工程—电力系统及自动化]