基于虚拟过渡电阻与DTW距离的有源配电网高阻故障区段定位方法  

High-impedance Fault Section Location Method for Active Distribution Networks Based on Virtual Fault Resistance and DTW Distance

作　　者：李海勇 郑新铖 郑茂然[3] 田君杨 黄鹏飞 LI Haiyong;ZHENG Xincheng;ZHENG Maoran;TIAN Junyang;HUANG Pengfei(Electric Power Dispatching and Control Center,Guangxi Power Grid Company,Nanning 530023,China;School of Electrical Engineering,Shandong University,Jinan 250061,China;Electric Power Dispatching and Control Center,China Southern Power Grid Company,Guangzhou 510623,China)

机构地区：[1]广西电网电力调度控制中心,南宁530023 [2]山东大学电气工程学院,济南250061 [3]中国南方电网电力调度控制中心,广州510623

出　　处：《电力系统及其自动化学报》2025年第3期139-148,共10页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(52077124);广西电网公司科技项目(046000KK52230003)。

摘　　要：针对有源配电网高阻接地故障检测难题,提出一种基于虚拟过渡电阻与动态时间弯曲距离的故障区段定位方法。首先分析高阻接地故障特征,正常运行时非故障线路三相虚拟过渡电阻均为无穷大,发生接地故障时故障区段的故障相虚拟过渡电阻减小为真实过渡电阻,而其他两相仍为无穷大,利用变异系数表征三相虚拟过渡电阻间的差异大小并构建了高阻接地故障区段定位判据;其次,针对低阻接地故障时三相线路耦合导致误判的情况,利用动态时间弯曲距离构造低阻接地故障辅助判据;最后,利用PSCAD搭建有源配电网仿真模型,仿真结果表明所提方法不受系统运行方式、分布式电源接入容量的影响,在系统中性点不接地、经消弧线圈接地、经小电阻接地及高渗透率分布式电源接入时均能正确识别故障区段,耐过渡电阻能力达5 kΩ。To address the problem of high-impedance grounding fault detection in active distribution networks(ADNs),a fault section location method based on virtual fault resistance(VFR)and dynamic time warping(DTW)distance is proposed.First,the fault characteristics of high-impedance grounding fault are analyzed,i.e.,the three-phase VFRs of healthy lines are infinite during the normal operation,and the VFR in the faulty phase of the faulty section decreases to the true fault resistance when a grounding fault occurs,with those in the other two phases remaining in-finite.The coefficient of variation is used to quantify the differences among VFRs in three phases,and a location criterion for high-impedance grounding fault section is established.Then,an auxiliary criterion based on DTW distance is for-mulated to address the misjudgment caused by coupling between three-phase lines under low-impedance grounding faults.Finally,a simulation model of active distribution network is built in PSCAD.Simulation results show that the pro-posed method is not affected by the system operation mode or the access capacity of distributed generations(DGs).It can correctly identify the fault section when the neutral point of the system is not grounded,or grounded through an arc suppression coil or a small resistance,and even in the case of high penetration of DGs.The capability to withstand the transition resistance is up to 5 kΩ.

关 键 词：有源配电网 高阻故障 故障区段定位 虚拟过渡电阻 动态时间弯曲距离 

分 类 号：TM77[电气工程—电力系统及自动化]