基于时频谱相似度全并联AT牵引网行波测距方法  

Traveling Wave Ranging Method for All Parallel AT Traction Network Based on Time Spectrum Similarity

作　　者：舒新星 陈剑云[1] 华敏 傅钦翠[1] SHU Xinxing;CHEN Jianyun;HUA Min;FU Qincui(State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学省部共建轨道交通基础设施性能监测与保障国家重点实验室,江西南昌330013

出　　处：《铁道学报》2022年第6期37-45,共9页Journal of the China Railway Society

基　　金：国家自然科学基金(51467004)。

摘　　要：针对全并联AT牵引网线路参数不均匀,并由于AT自耦变压器连接上下行而改变线路拓扑结构,使线路电压、电流分布复杂而增加故障定位难度的问题,将行波法运用在牵引网故障测距中。根据故障发生后供电臂首末两端必有一端电流信号奇异性低难以检测的特点,提出一种基于时频谱相似度全并联AT牵引网行波测距方法。首先测量双端电流数据,计算牵引变电所端上下行电流行波的时频谱相似度矩阵识别故障点区段,最后选择与故障点同一区段量测端的电流行波识别反射波、电压行波标定波到时刻。仿真结果表明:该方法提高了检测和标定波头的准确性,测距结果不受过渡电阻、短路类型的影响,误差均在150 m之内,且不存在单端测距识别第2个反射波和双端测距数据对时的问题,并与基于吸上电流比的现场测距结果进行对比和实测数据验证,该方法准确有效且稳定。In response to the nonuniform line parameters of parallel AT traction network and the change of the topology structure of the line due to the connection of AT autotransformer that cause more complex distribution of line voltage and current and increase the difficulty in locating the fault,the traveling wave method was used in fault location of traction network.Due to the characteristics that upon the occurrence of a fault,the current signal will have a low singularity that is difficult to detect at either side of the feeding section,this paper proposed a new traveling wave fault location method based on time-frequency spectrum similarity for all parallel AT traction network.First,the current data at both ends were measured.Then,the time-frequency spectrum similarity matrix of the upline and downline current at the traction substation was calculated to identify the fault point section.Finally,the single terminal fault location was performed on the current traveling wave at the measurement end in the same section as the fault point is selected to identify the reflected wave,voltage traveling wave and the calibration wave to the time.The simulation results show that the proposed method can improve the accuracy of detection and calibration of the wavefront.The results are not affected by the transition resistance or short circuit types,with the numerical errors being within 150 m.It also avoids the problem of using a new single terminal fault location to identify the second reflected wave and two-terminal fault location data synchronization.Last,the verification of the measured data and the comparison with the on-site experimental results based on the current draw ratio show the accuracy,effectiveness and stability of the method.

关 键 词：全并联AT牵引网 行波 故障测距 小波变换 时频谱相似度 

分 类 号：U225[交通运输工程—道路与铁道工程]