基于时-频分析方法的具有时变特性电力系统谐波分析方法研究  

Analyzing for power system harmonics with time-varying characteristics based on time-frequency analysis method

作　　者：周强[1] 张瑞瑞 陈晗 ZHOU Qiang;ZHANG Rui rui;CHEN Han(College of Electrical and Information Engineering,Shaanxi University of Science ＆ Technology,Xi＇ an 710021,China)

机构地区：[1]陕西科技大学电气与信息工程学院,陕西西安710021

出　　处：《陕西科技大学学报》2018年第4期147-152,164,共7页Journal of Shaanxi University of Science & Technology

基　　金：陕西省科技厅科技攻关计划项目(2016GY-005);陕西省教育厅专项科研计划项目(16JK1105);陕西省大学生创新创业训练计划项目(201610708016)

摘　　要：针对传统傅里叶变换方法因不具有时间分辨率且抗噪能力弱,而无法实时有效的分析电网谐波成分的问题,本文利用小波变换、小波包变换和短时傅里叶变换等方法的强大时频分析能力,将含有噪声且具有时变性的电力谐波映射到"时间-频率-幅值"的三维空间进行分析,从这些方法的实时性、时分辨率、频分辨率和抗噪能力等几个方面展开研究,探索分析电力系统谐波的最佳方法.研究表明:短时傅里叶变换在分析电力系统谐波时具有优越性,可以成为实践中分析电力系统谐波的有效方法.In view of the traditional Fourier transform method,the problem of the harmonic components of the power grid cannot be analyzed in real time because of the lack of time resolution and the weak ability to resist noise.The powerful time-frequency method of wavelet transform,wavelet packet transform and short-time Fourier transform analysis is exploited to map the power harmonic with noise and time varying to the three-dimensional space of ＂time frequency amplitude＂.And studies are conducted from the aspects of real-time,time resolution,frequency resolution and noise immunity to explore the best method to analyze harmonic analysis in power system.The research shows that the advantage of short time Fourier transform in analyzing harmonic of power system can be an effective method to analyze harmonic in power system.

关 键 词：电力谐波分析 时-频分析 时变信号 

分 类 号：TM935[电气工程—电力电子与电力传动]