基于子系统划分和注入电流比的配电网故障定位方法  

Fault location method for a distribution network based on subsystem division and injection current ratio

作　　者：李浩[1] 张禄亮[1] 栾云飞 单海婷 莫春 LI Hao;ZHANG Luliang;LUAN Yunfei;SHAN Haiting;MO Chun(School of Electric Power Engineering,South China University of Technology,Guangzhou 510006,China)

机构地区：[1]华南理工大学电力学院,广东广州510006

出　　处：《电力系统保护与控制》2023年第8期63-72,共10页Power System Protection and Control

基　　金：广东省自然科学基金面上项目资助(2022A 1515011587);国家自然科学基金面上项目资助(52077081)。

摘　　要：针对配电网因结构复杂、分支众多而难以实现准确故障定位的问题,提出了一种基于子系统划分和注入电流比的配电网故障定位方法。首先,根据末端节点数将配电网划分成若干相互独立的子系统,并在任意子系统内计算首末端节点的等效虚拟注入电流,继而可得故障点的注入电流。然后,假设将该电流在各子系统的不同节点分别注入,根据末端节点电压计算值与实测值的误差大小确定故障子系统。最后,在故障子系统内,利用首末端节点注入电流比与真实故障点的位置关系进行故障定位。所提方法仅需在首末端节点配置微型同步相量测量单元,具有较好的经济性。经Matlab/Simulink仿真测试,所提方法不仅受故障类型、过渡电阻、故障位置、初相角的影响较小,而且对负荷变化和噪声不敏感。It is difficult for a distribution network to achieve accurate fault location because of its complex structure and many branches.Thus this paper proposes a distribution network fault location method based on subsystem division and injection current ratio.First,the network is divided into several independent subsystems according to the number of end nodes,and the equivalent virtual injection current of the head and end nodes is calculated according to any subsystem,and then the injection current of the fault point can be obtained.Then,assuming that the current is injected from different nodes of each subsystem,the fault subsystem is determined according to the error between the calculated value and the measured value of the end node voltage.Finally,in the fault subsystem,the relationship between the injection current ratio of the head and end nodes and the position of the real fault point is used to locate the fault.The proposed method only needs to configure a micro synchronous phasor measurement unit(μPMU)at the head and end nodes.This method has good economy.Through Matlab/Simulink simulation tests,the proposed method is not only less affected by fault type,transition resistance,fault position and fault initial phase angle,but is also insensitive to load variation and noise.

关 键 词：配电网 子系统划分 注入电流比 故障子系统 微型同步相量测量单元 故障定位 

分 类 号：TM73[电气工程—电力系统及自动化]