基于模量幅值比的高压交流输电线不对称接地故障单端定位  

Single end location of asymmetric grounding fault for high voltage transmission lines based on modulus amplitude ratio

作　　者：王勇棋 谢佳伟[1] 陈仕龙[1] 赵鑫 WANG Yongqi;XIE Jiawei;CHEN Shilong;ZHAO Xin(School of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学电力工程学院,云南昆明650500

出　　处：《电机与控制学报》2024年第12期129-147,共19页Electric Machines and Control

基　　金：国家自然科学基金(52067009)。

摘　　要：针对高压交流输电线路不对称接地故障单端行波测距法中高阻接地故障不灵敏、反射波波头识别困难等问题,提出一种基于模量幅值比的高压交流输电线不对称接地故障单端定位方法。首先,基于行波色散特性,推导出高压交流输电线路故障距离与测距处初始暂态电压行波1模、2模分量之和与0模分量的幅值比的近似公式,公式表明两者存在着确定的非线性映射关系;使用初始暂态电压行波1模、2模分量之和与0模分量的多尺度小波模极大值比表征幅值比,输入小波模极大值比到天鹰算法优化核极限学习机(AO-KELM)神经网络,拟合故障距离与幅值比映射关系得到AO-KELM神经网络测距模型,算出故障距离。本文仿真结果表明,该方法测距能力不受故障类型、故障位置、过渡电阻、故障初相角影响,测距精度高。Aiming at the problems of high resistance ground fault insensitivity and difficulty in identifying reflected wave head in single-ended traveling wave location method,a single-ended location method for high voltage direct current(HVDC)transmission lines based on the sum of 1-mode and 2-mode components and the amplitude ratio of 0-mode components of initial transient voltage traveling wave was proposed.Firstly,based on the dispersion characteristics of traveling wave,the approximate formula of the fault distance and the sum of 1-mode and 2-mode components and the amplitude ratio of 0-mode components of the initial transient voltage traveling wave of HVDC transmission line was derived.The sum of 1-mode and 2-mode components of initial transient voltage traveling wave and the multi-scale wavelet mode maximum ratio of 0-mode component were used to characterize the amplitude ratio,and the multi-scale wavelet mode maximum ratio was input into aquila optimizer-extreme learning machine with kernel(AO-KELM)neural network.The AO-KELM neural network ranging model was obtained by fitting the fault distance,the sum of the 1-mode and 2-mode components of the initial transient voltage traveling wave,and the maximum ratio of the 0-mode multiscale wavelet modes.The simulation results show that the performance of this method is not affected by the fault type,fault location,transition resistance,fault initial phase angle,and the positioning accuracy is high.

关 键 词：高压交流输电线路 行波色散 单端测距 模量幅值比 AO-KELM神经网络 

分 类 号：TM771[电气工程—电力系统及自动化]