基于波前陡度的直流输电线路单端行波测距方法  

A Single-Ended Traveling Wave Location Method for DC Transmission Lines Based on Wavefront Steepness

作　　者：刘志栋 陈羽[1] 孙伶雁 丁锐 程钎 王玮[1] LIU Zhidong;CHEN Yu;SUN Lingyan;DING Rui;CHENG Qian;WANG Wei(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,Shandong,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255000

出　　处：《电网与清洁能源》2023年第6期70-79,共10页Power System and Clean Energy

基　　金：国家自然科学基金项目(52077221)。

摘　　要：针对直流输电线路单端行波测距故障点反射波波头识别困难,利用直流线路过电压吸收电容接地端互感器二次侧电流间接获取线路故障行波,基于直流线路故障初始行波波前陡度和故障距离的关系,结合EMD分解IMF1模极大值故障波头标记,提出了故障点反射波头的自动识别方法。对单端故障行波数据进行EMD分解,利用IMF1模极大值标记各波头到达测量端故障的时刻;根据线路故障初始波头波前陡度计算初步故障距离,从已标记的波头中筛选与该距离最接近的模极大值点,确定故障点反射波,实现单端行波自动测距。在PSCAD/EMTDC中建立了±500 kV直流线路仿真模型,结果表明,所提算法能有效识别故障点反射波,在不同故障条件下算法具有较好的适用性。When using single-ended traveling wave fault location method on DC transmission lines,it is difficult to identify the reflected wave at the fault point.In this paper,the secondary current of the transformer at the grounding end of the DC line overvoltage absorption capacitor is used to indirectly obtain the line fault traveling wave.Based on the relationship between the initial traveling wave distorted wavefront of the DC line fault and the fault distance,combined with EMD decomposition IMF1 modulus maximum fault wavefront marking,an automatic identification method of fault point reflected wavefront is proposed.First,EMD decomposition of single-ended fault traveling wave data is carried out,the IMF1 modulus maximum is used to mark the fault moment when each wave head reaches the measuring end;second,the initial fault distance is calculated by using the wavefront steepness of the initial wave head of the line fault.The modulus maximum point closest to the distance is screened from the marked wave head,and the reflected wave of the fault point is determined to realize the automatic fault location of the single-ended traveling wave.The simulation model of a±500 kV DC line is established in PSCAD/EMTDC,and the results of the example prove the effectiveness of the algorithm.

关 键 词：直流输电 单端行波测距 波前陡度 EMD分解 模极大值 

分 类 号：TM773[电气工程—电力系统及自动化]