基于综合位置峰值检测的微网高阻故障检测方法  

A Microgrid High Impedance Fault Detection Based on Integrated Position Peak

作　　者：雷莱 王晓卫 田影 屈新宇 王雪[2] 岳阳 LEI Lai;WANG Xiaowei;TIAN Ying;QU Xinyu;WANG Xue;YUE Yang(School of Energy and Power Engineering,Zhengzhou Electric Power College,Zhengzhou 450000,Henan,China;School of Electrical Engineering,Xi’an University of Technology,Xi’an 710054,Shaanxi,China)

机构地区：[1]郑州电力高等专科学校能源与动力工程学院,河南郑州450000 [2]西安理工大学电气工程学院,陕西西安710054

出　　处：《电网与清洁能源》2025年第3期60-66,共7页Power System and Clean Energy

基　　金：国家自然科学基金项目(52177114)。

摘　　要：针对微电网灵活的运行方式及其高阻故障不易与正常扰动有效区分等问题,提出了一种基于经验小波变换和综合位置峰值的微电网高阻接地故障检测方法。通过差分运算和归一化运算来获取归一化差分零序电流;利用经验小波变换对归一化差分零序电流进行分解,并根据极值变化率指标来自适应地选取故障特征分量;利用采样点数编号和故障特征分量峰值来构建综合位置峰值量化指标,进而通过综合位置峰值的不同取值来实现微电网高阻接地故障。大量仿真实验表明,所提方法能够准确检测出微电网高阻故障,并不受微电网正常扰动、运行状态的影响。Considering the challenges of traditional disturbance detection methods in effectively distinguishing normal disturbances from weak fault disturbances,such as high impedance faults,during the flexible operation of microgrids,this paper proposes a high-impedance grounding fault detection method for microgrids based on empirical wavelet transform(EWT)and an integrated position peak value.Initially,the normalized differential zero sequence current is obtained through differential and normalization operations.Subsequently,the normalized differential zero sequence current is decomposed using EWT,and the faulty feature component is adaptively selected based on the change rate of extreme values.Then,an integrated location peak quantization index is constructed using the sampling point number and the peak value of the faulty feature component,which is then employed to detect high impedance faults in microgrids by setting an appropriate threshold.Finally,extensive simulation experiments demonstrate that the proposed method can accurately detect high-impedance faults in microgrids and is unaffected by normal disturbances or operational states of the microgrid.

关 键 词：高阻接地故障 经验小波变换 差分零序电流 极值变化率 综合位置峰值 

分 类 号：TM77[电气工程—电力系统及自动化]