基于微型PMU的配电网多分支架空线路参数无关故障定位算法  

Parameter-free Fault Location Algorithm for Multi-terminal Overhead Transmission Line of Distribution Network Based on μMPMU

作　　者：王成斌 贠志皓[1] 张恒旭[1] 石访 凌平 谢邦鹏 WANG Chengbin;YUN Zhihao;ZHANG Hengxu;SHI Fang;LING Ping;XIE Bangpeng(Key Laboratory of Power System Intelligent Dispatch and Control(Shandong University),Ministry of Education,Jinan 250061,Shandong Province,China;State Grid Shanghai Electric Power Research Institute,Hongkou District,Shanghai 200437,China;State Grid Shanghai Municipal Electric Power Company,Pudong District,Shanghai 200233,China)

机构地区：[1]电网智能化调度与控制教育部重点实验室(山东大学),山东省济南市250061 [2]国网上海市电力公司电力科学研究院,上海市虹口区200437 [3]国网上海市电力公司,上海市浦东区200233

出　　处：《电网技术》2019年第9期3202-3209,共8页Power System Technology

基　　金：国家重点研发计划项目(2017YFB0902800);国家电网公司科技项目(SGTYHT/16-JS-198)~~

摘　　要：随着分布式电源以分支线形式大量接入配电网,多分支线故障定位算法在有效性和准确性上面临着重大的挑战。为减少线路参数不准确引起的定位误差,提出了一种新型线路参数无关故障定位算法。此方法仅利用故障后线路各端电压电流的同步测量值和线路长度,无需知道各条线路参数,根据故障点和分接点处由相邻节点电气量推算的电压相等的原理构建测距方程组。算法假设故障发生在各区段,分别列写相应测距方程组,并通过信赖域算法分别求解各组方程中的故障距离、分接点位置、各线路单位长度阻抗参数,最后根据各组解是否合理直接判断故障位置。MATLAB/Simulink仿真结果表明,此算法具有较高的精度,基本不受线路参数、故障位置、过渡电阻、非对称故障类型的影响。Fault location algorithms for multi-terminal transmission lines face significant challenges in terms of effectiveness and accuracy because of distributed generation in distribution network integrated with such kind of lines.In order to reduce the error caused by inaccurate line parameters,this paper proposes a novel parameter-free fault location algorithm.According to the principle that the voltages at fault point and junction points calculated with adjacent nodes are equal respectively,this method yields ranging equations,only utilizing the post-fault synchronous measurements of voltage and current at the terminals of lines without knowing the line impedance parameter values and the location of junction points.This algorithm assumes that fault occurs on each section and yields corresponding ranging equations to calculate the unknowns including fault distance,junction point distances and impedance per-unit length of line in each equation set with trust-region method.Then the fault position is identified directly based on reasonable solutions.This method is investigated with MATLAB/Simulink and the results indicate that the proposed algorithm has higher accuracy,basically unaffected by line parameters,fault position,fault resistances and unbalanced fault types.

关 键 词：配电网 故障定位 多分支线路 参数无关 

分 类 号：TM721[电气工程—电力系统及自动化]