摘要
电力系统的谐波是影响电能质量的重要因素,本文论述了基于小波变换的谐波检测方法,将含谐波的电信号进行基于多分辨思想的正交小波变换,解决了时频同时局部化的问题,并提出单子带重构算法,改善了Mallat算法中的频率折叠问题。由于小波分析在时、频域内良好的局部性,使之在谐波的跟踪检测、进而抑制谐波对电力系统的不良影响方面具有十分重要的意义。
Harmonic is an important influence of power quality in power system. The essay describes a method of harmonic detection based on wavelet transform, it transforms the signal with harmonic component based on orthogonal wavelet transform, which could solve the problem of local time-frequency domain. It also raises reconstruct arithmetic of single sub-band, which could improve the folding frequency in Mallat. Because of the good characteristic in time domain and frequency domain of wavelet analysis, there has important meaning in following the track of harmonic and keeping down the harmful influence in power system.
出处
《国外电子测量技术》
2008年第7期21-24,共4页
Foreign Electronic Measurement Technology
关键词
小波分析
谐波检测
单子带
频率折叠
wavelet analysis
harmonic detection
single sub-band
folding frequency
