基于复域暂态解析的柔性直流输电线路单端故障测距方法  

Single-ended Fault Location Method for Flexible DC Transmission Lines Based on Complex-domain Transient Analysis

作　　者：梁远升[1] 徐征 丁佳彦 陈浩泳 李海锋[1] 王钢[1] LIANG Yuansheng;XU Zheng;DING Jiayan;CHEN Haoyong;LI Haifeng;WANG Gang(School of Electric Power Engineering,South China University of Technology,Guangzhou 510641,China;Shantou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Shantou 515031,China)

机构地区：[1]华南理工大学电力学院,广东省广州市510641 [2]广东电网有限责任公司汕头供电局,广东省汕头市515031

出　　处：《电力系统自动化》2024年第24期155-165,共11页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(52077082)。

摘　　要：输电线路的精确故障测距能降低巡线的难度、缩短修复时间,提升柔性直流输电线路单端故障测距方法的精度具有重要意义。文中基于故障时域暂态波形相似度特征模型,以柔性直流输电系统复域故障暂态解析计算模型作为特征拟合工具,通过故障录波与解析结果的波形相似性评价特征拟合程度,将故障测距问题转化为余弦相似度、平均绝对差两个评估指标的优化问题进行求解;提出了基于复域暂态解析拟合的柔性直流输电线路故障测距方法。最后,通过PSCAD/EMTDC仿真验证了所提故障测距方法的有效性。所提方法耐受过渡电阻能力强,无须依赖大量仿真与训练来提高测距精度。The accurate fault location for transmission lines can reduce the difficulty of line inspection,shorten the repair time,and it is of great significance to enhance the accuracy of the single-ended fault location method for flexible direct current(DC)transmission lines.In this paper,based on the similarity characteristic model of the fault time-domain transient waveform,using the complex-domain fault transient analytical calculation model of the flexible DC transmission system as the feature fitting tool,the degree of feature fitting is evaluated through the waveform similarity between the fault recording and the analytical results,and the fault location problem is transformed into the optimization problem of two evaluation indicators,namely cosine similarity and average absolute deviation for solution.A fault location method for flexible DC transmission lines based on complex-domain transient analytical fitting is proposed.Finally,the effectiveness of the proposed fault location method is verified through PSCAD/EMTDC simulation.The proposed method has strong resistance to transition resistance and does not rely on a large number of simulations and trainings to improve the location accuracy.

关 键 词：柔性直流输电 模块化多电平换流器 暂态解析 故障测距 特征拟合 波形相似度 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM75