含逆变型分布式电源的配电网馈线终端告警信息校正及故障定位方法  

Method of Alarm Information Correction and Fault Location for Distribution Network with Inverter-Interfaced Distributed Generation

作　　者：李宗博 崔一嘉 王昊晴 郗乙搏 Li Zongbo;Cui Yijia;Wang Haoqing;Xi Yibo(Key Laboratory of Modern Power System Simulation and control&Renewable Energy Technology Ministry of Education Northeast Electric Power University,Jilin 132012 China;China Electric Power Research Institute,Beijing 100192 China;Ultra High Voltage Company State Grid Ningxia Electric Power Co.Ltd,Yinchuan 750000 China)

机构地区：[1]东北电力大学现代电力系统仿真控制与绿色电能新技术教育部重点实验室,吉林132012 [2]中国电力科学研究院有限公司,北京100192 [3]国网宁夏电力有限公司超高压公司,银川750000

出　　处：《电工技术学报》2025年第4期1268-1286,共19页Transactions of China Electrotechnical Society

基　　金：国家电网公司科技项目(5108-202218280A-2-367-XG);东北电力大学博士科研启动基金项目(BSJXM-2022102)资助。

摘　　要：逆变型分布式电源(IIDG)使配电网存量馈线终端(FTU)存在漏误告警问题,同时外部环境也会使告警信息不正确上报,难以准确定位故障区段。该文考虑IIDG和环境因素的耦合影响,提出一种FTU告警信息校正及故障定位方法。首先,根据各馈线首端电流特征,提出单双重故障及故障类别的检测方法。其次,考虑不可测IIDG和分支负荷的影响,利用正序电流幅值比和相邻区段电流相似性分别提出对称/不对称短路的识别方法,进而校验初始定位结果的准确性。再次,若定位结果未包含全部故障区段,以分支线路和IIDG的接入点为边界,利用短路电流特征提出疑似故障发生区域的筛选方法,并根据短路识别方法研判故障区段,实现告警信息的校验与修正。最后,在PSCAD中搭建IEEE 33节点标准算例和某县实际配电网的仿真模型,验证了单双重故障检测、短路识别判据及故障区域划分等告警信息校正和故障定位方法的有效性。The integration of inverter-interfaced distributed generation(IIDG)into distribution networks introduces issues of missing or false alarms at the existing feeder terminal unit(FTU).Simultaneously,external environmental factors can distort the reported fault information of FTUs,making it challenging to locate faults accurately.Considering the coupled impact of IIDG and environmental factors,this paper proposes a method for correcting FTU fault information and fault location by fusing alarm information and partial telemetry.Firstly,the fault type is judged according to the comparison of the number of lines,current mutation time,and amplitude of the short-circuit current characteristic at the switch.Then,the verification method of initial positioning results and the verification and correction method of alarm information are proposed.Based on the ratio of positive-sequence current amplitudes,a symmetric short circuit identification method is proposed by using the positive sequence current at the exit of the circuit and two adjacent sections.The effect of undetectable IIDGs is eliminated by rotating the leading phase current by 120°and subtracting the lagging phase current.Considering the type of unmeasured load,an asymmetric short circuit identification method based on the current similarity in adjacent sections is proposed.Then,the accuracy of the initial fault location results is judged.If the initial fault location result contains the real fault section,the location is considered accurate,and only the location result needs to be modified.If the real fault section is not included,a hierarchical analysis method of short-circuit characteristics of the distribution network is proposed.The distribution network is divided into several regions using the access points of branch lines or IIDG as boundaries.Short-circuit current characteristics are used to assess the fault occurrence area,and the short-circuit identification method filters fault sections,achieving the validation and correction of fault information.Finally

关 键 词：逆变型分布式电源 故障区段定位 告警信息校正 正序电流幅值比 电流相似性 分析 

分 类 号：TM721[电气工程—电力系统及自动化]