基于小波变换的电力系统间谐波分析与检测  

Analysis and Detection of Power System Inter-harmonic Based on Wavelet Transform

作　　者：张严[1] 吕伟杰 

机构地区：[1]西南交通大学电气工程学院,四川成都610031 [2]中铁第二勘测设计院电化处

出　　处：《电气开关》2009年第2期46-47,71,共3页Electric Switchgear

摘　　要：间谐波是电力系统中一种特殊的谐波,它大量存在于电网中。间谐波对电网危害极大,所以对它进行分析和检测具有重要的科学与工程意义。传统的经典傅立叶变换(DFT)在对间谐波的分析上有易受噪声干扰和分辨率低的缺点。提出一种基于小波变换的间谐波分析方法,在MATLAB环境下,针对电力系统中循环变流器产生的间谐波进行消噪、检测,仿真结果表明,这种方法不仅具有高分辨率特性,可以很好地分析间谐波,而且能实时跟踪检测间谐波。Inter-harmonics are special harmonies in power system, they widely exist in power grids. Because the interharmonies being severe harm to power grids, detecting and analyzing inter-harmonics has significant scientific and engineering significance. The conventional classical DFT method has shortcomings such as sensitive to noise and inaccurate performance in inter-harmonics analysis. A new method to analyze inter-harmonics by using wavelet transform is proposed to overcome those shortcomings by this paper. In MATLAB environment,focusing on the noise elimination and detecting for inter-harmonics generated by sycloconverter, the simulation results show that the proposed method provides super-resolution ability ,with analyzing and tracking inter-harmonics in real time.

关 键 词：小波变换 电力系统 间谐波 谐波分析 MATLAB 

分 类 号：TM71[电气工程—电力系统及自动化]