基于VMD-SSDEO的全并联AT牵引网故障定位  

Fault localization of fully parallel AT traction network based on VMD-SSDEO

作　　者：李泽文[1] 冯译萱 夏翊翔 张一鸣 刘国胜 张灵芝[2] 罗姗姗 LI Zewen;FENG Yixuan;XIA Yixiang;ZHANG Yiming;LIU Guosheng;ZHANG Lingzhi;LUO Shanshan(School of Electrical&Information Engineering,Changsha University of Science&Technology,Changsha 410114,China;School of Railway Power Supply and Electrical Engineering,Hunan Vocational College of Railway Technology,Zhuzhou 412006,China;Periodical Press,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,湖南长沙410114 [2]湖南铁路科技职业技术学院铁道供电与电气学院,湖南株洲412006 [3]长沙理工大学期刊社,湖南长沙410114

出　　处：《电力科学与技术学报》2025年第1期55-66,共12页Journal of Electric Power Science And Technology

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：针对全并联自耦变压器(auto-transformer,AT)牵引网故障点反射波波头微弱难辨识,且线路并联结构导致故障行波折反射复杂而造成定位困难的问题,提出基于变分模态分解(variational mode decomposition,VMD)和改进能量算子的牵引网故障行波单端定位方法。首先,深入分析牵引网故障行波的传输特性,研究全并联结构对行波折反射的影响,确定不同故障类型和潮流特征,以此为依据提取故障特征量,将波头辨识转化为能量突变值提取;随后,利用VMD去噪提取电压行波真实分量,再针对第二反射波波头微弱难标定问题,在滑动时间窗口(sliding time window,STW)下,结合对称差分能量算子(symmetrical differencing energy operator,SDEO)构造故障信号的二次瞬时能量谱,效果良好。仿真结果表明:所提方法抗过渡电阻能力强,能够反应不同工况下故障牵引网电磁能量的变化,具有较高的定位精度。To address the issue of weakly discernible wave heads in the reflection waves of faults in the fully parallel auto transformer(AT)traction network,compounded by difficult localization caused by refraction and reflection complexity of fault traveling waves introduced by the parallel structure of the lines,a single-ended localization method for fault traveling waves in the traction network is proposed based on variational mode decomposition(VMD)and enhanced energy operator.Firstly,the transmission characteristics of fault traveling waves in the traction network are analyzed,with a focus on the impact of the fully parallel structure on the refraction and reflection of fault traveling waves.Features of different fault types and power flows are determined,facilitating the extraction of fault features.The process of wave head identification is transformed into the extraction of abrupt energy changes.Then,VMD is used for denoising and extracting the genuine voltage traveling wave component.In view of the challenging calibration of weak wave heads in the second reflection wave,a sliding time window(STW)combined with the symmetrical differencing energy operator(SDEO)is employed to construct the second instantaneous energy spectrum of the fault signal,yielding satisfactory results.Simulation outcomes demonstrate the method’s robust resistance to transient resistances,its ability to reflect variations in electromagnetic energy under different operating conditions in the fault traction network,and its high precision in fault localization.

关 键 词：全并联AT牵引网 故障测距 行波单端定位 对称差分能量算子 

分 类 号：TM77[电气工程—电力系统及自动化]