基于主特征量的全并联AT牵引网故障定位方法  

Fault Localization Method for All-parallel AT Traction Network Based on Dominant Eigenquantities

作　　者：刘国胜 李泽文[1] 夏翊翔 吴国瑞 冯译萱 LIU Guosheng;LI Zewen;XIA Yixiang;WU Guorui;FENG Yixuan(School of Electrical and Information Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410114

出　　处：《高电压技术》2024年第12期5357-5367,I0003,共12页High Voltage Engineering

基　　金：国家自然科学基金(51877012);湖南省科技创新人才计划科技创新团队项目(2021RC4061)。

摘　　要：针对现有全并联AT牵引网单端故障定位方法存在故障区段识别灵敏度低、单端定位第二波头辨识难的问题,提出了一种基于主特征量的全并联AT牵引网故障定位方法。首先,分析了自耦变压器的边界特性,论证了利用主频差异度判据识别故障区段的可行性。然后,基于全并联AT牵引网上下行线路并联的结构,分析了电流行波突变幅值与两端母线出线数的关系,并根据突变幅值最大原则识别上下线路各自的行波主波头。最后,提出了一种基于主波头时差的全并联AT牵引网故障定位方法,利用主波头时差与故障距离的固定映射关系实现故障点的精确定位。仿真结果表明,所提方法无须识别易受过渡电阻影响的行波第二波头,能灵敏识别故障区段并精准定位故障点。To address the issues of low sensitivity in fault section identification and difficulty in identifying the second traveling wave head in single-ended fault location in existing all-parallel AT traction network(APATTN),a new fault lo-cation method based on the dominant characteristic quantities is proposed.Firstly,the boundary characteristics of the auto-transformer are analyzed,demonstrating the feasibility of using the dominant frequency difference criterion to iden-tify fault sections.Then,based on the parallel structure of the up-and-down lines in the APATTN,the relationship between the current traveling wave mutation amplitude and the number of outgoing lines at both ends of the bus is analyzed.The dominant traveling wave head on each of the up-and-down lines is identified according to the principle of maximum mu-tation amplitude.Finally,a fault location method based on the dominant traveling wave head time difference in the APATTN is proposed.The precise fault point location can be achieved by utilizing the fixed mapping relationship be-tween the dominant traveling wave head time difference and the fault distance.Simulation results show that the proposed method can be adopted to sensitively identify fault sections and accurately locate fault points without needing to identify the second traveling wave head,which is easily affected by transition resistance.

关 键 词：全并联AT牵引网 自耦变压器 主频量 故障主波头 行波故障定位 

分 类 号：U226[交通运输工程—道路与铁道工程]