基于故障电流变化趋势的有源配网高阻故障检测  

High-Impedance Fault Detection Based on Arc Changing Tendency for Active Distribution Networks

作　　者：王毅钊 王晓卫 魏向向 田影 王雪[2] 岳阳 张志华 WANG Yizhao;WANG Xiaowei;WEI Xiangxiang;TIAN Ying;WANG Xue;YUE Yang;ZHANG Zhihua(Electric Power Research Institute of State Grid Shaanxi Electric Power Co.,Ltd.,Xi’an 710100,Shaanxi,China;School of Electrical Engineering,Xi’an University of Technology,Xi’an 710054,Shaanxi,China;School of Electrical Engineering and Computer Science,Technische Universität Berlin,Berlin 10623,Germany)

机构地区：[1]国网陕西省电力有限公司电力科学研究院,陕西西安710100 [2]西安理工大学电气工程学院,陕西西安710054 [3]柏林工业大学电气与计算机学院,德国柏林10623

出　　处：《电网与清洁能源》2025年第3期78-84,共7页Power System and Clean Energy

基　　金：国家自然科学基金项目(52177114,61403127);国网陕西省电力有限公司科技项目(5226KY230001)。

摘　　要：当有源配网中发生高阻故障时,电弧电流易与电容投切或负荷投切所产生的电流特征相混淆,且高阻故障电流特征微弱,易受到噪声和谐波的干扰,这将导致现有弧光高阻故障检测方法检测精度降低。为了准确检测高阻电弧故障,提出一种基于电弧变化趋势和非线性最小二乘法的高阻电弧故障检测方法。采用首先利用变分模态分解算法(variational mode decomposition,VMD)处理零序电流后,再进行加窗快速傅里叶变换(windowed fast fourier transform,WFFT)提取电流幅值;利用非线性最小二乘法定量表示电弧电流的变化趋势;依据非线性函数的系数差异判断是否发生高阻电弧故障。大量仿真验证表明,所提方法不受噪声影响,具有一定的鲁棒性。When a high resistance fault occurs in an active distribution network,the arc current can be easily mistaken for the current characteristics generated by capacitor switching or load switching.Additionally,the current characteristics of high resistance faults are weak and susceptible to noise and harmonic interference,which can lead to a decrease in the detection accuracy of existing arc high resistance fault detection methods.To accurately detect high resistance arc faults,a high resistance arc fault detection method based on arc variation trend and nonlinear least squares method is proposed in this paper.The method first employs Variational Mode Decomposition(VMD)to process the zero-sequence current,and then extracts the current amplitude using Windowed Fast Fourier Transform(WFFT).Subsequently,the nonlinear least squares method is used to quantify the trend of arc current variation.Finally,based on the coefficient difference of the nonlinear function,whether a high resistance arc fault has occurred is determined.Extensive simulation validations have demonstrated that the proposed method is immune to noise and exhibits a certain degree of robustness.

关 键 词：高阻故障 变分模态分解 加窗快速傅里叶变换 非线性最小二乘法 

分 类 号：TM77[电气工程—电力系统及自动化]