基于小波包变换的电力系统谐波分析  

The Harmonic Andlysis in Power system Based on Wavelet Transform

作　　者：刘平英[1] 刘国海[1] 

机构地区：[1]江苏大学电气信息工程学院,江苏镇江212013

出　　处：《微计算机信息》2008年第4期276-278,共3页Control & Automation

基　　金：江苏省高新技术项目(BG2004024);(GY2005006);(04CX02)

摘　　要：传统的基于傅立叶变换的谐波检测方法不具有时间分辨能力,小波和小波包变换因其良好的时频局部化特性,成为电力系统谐波分析的有力工具。本文分别用小波变换和小波包变换对电网谐波信号进行了检测,小波包变换建立在小波变换的基础上,可以实现信号频带的均匀划分,能更好地提取信号的时频特性。仿真结果显示两种方法均能有效地分离基波和谐波,小波包变换能根据要求分离任意次谐波,仿真分析中指出了两种分析方法的优缺点。Traditional Fourier transform has large limitation in time domain when it analyzes harmonics. Because of their excellent time-frequency characteristics, wavelet transform(WT) and wavelet packet transform(WPT) have become powerful tool for power system harmonic analysis. The methods for detecting harmonics are introduced in power system by means of WT and WPT. WPT constructed on the basis of WT, the frequency band of signals can be uniformly divided and the signal features in time domain and frequency domain...

关 键 词：小波变换 小波包变换 电力系统 谐波分析 

分 类 号：TM711[电气工程—电力系统及自动化]