基于改进HHT的谐波电流检测方法  

A harmonic current detection method based on improved HHT

作　　者：张炜生 张国有 关富敏 刘友强 陈晓 柯威帆 郭成 ZHANG Weisheng;ZHANG Guoyou;GUAN Fumin;LIU Youqiang;CHEN Xiao;KE Weifan;GUO Cheng(Shanwei Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Shanwei,Guangdong 516044,China;School of Electric Power Engineering,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]广东电网有限责任公司汕尾供电局,广东汕尾516044 [2]昆明理工大学电力工程学院,昆明650500

出　　处：《浙江电力》2025年第2期95-102,共8页Zhejiang Electric Power

基　　金：云南省联合基金重点项目(202201BE070001-15)。

摘　　要：针对HHT(希尔伯特-黄变换)进行谐波电流检测时出现的端点效应与模态混叠问题,提出一种改进HHT的谐波电流检测方法。首先,采用改进的波形匹配端点延拓法与MEEMD(改进的集合经验模态分解)方法,对待检测谐波电流信号进行延拓并分解,得到一系列IMF(本征模态函数),然后对各IMF进行HT(希尔伯特变换),得到各IMF的瞬时频率与瞬时幅值,最后求平均值即可得到各次谐波电流幅值与频率信息。通过仿真分析,验证了该方法可解决HHT进行谐波电流检测时出现的端点效应与模态混叠问题。To resolve the endpoint effects and mode mixing(MM)that arise during harmonic current detection using Hilbert-Huang Transform(HHT),an improved harmonic current detection method based on HHT is proposed.First,the paper employs an enhanced waveform matching endpoint extension method along with the modified en⁃semble empirical mode decomposition(MEEMD)technique to extend and decompose the harmonic current signal under detection.This process yields a series of intrinsic mode functionality(IMF).Next,the Hilbert Transform(HT)is applied to each IMF to obtain their instantaneous frequencies and amplitudes.Finally,by averaging these results,the amplitude and frequency information for each harmonic current component are extracted.Simulation analyses confirm that this method effectively resolves the endpoint effects and mode mixing encountered in HHT-based harmonic current detection.

关 键 词：谐波电流检测 经验模态分解 模态混叠 端点效应 波形延拓 

分 类 号：TM7[电气工程—电力系统及自动化]