电力系统及其自动化学报2013，Vol.25Issue(3)：162-166,5.
小波包变换在风电场谐波分析中的应用
Application of Wavelet Packet in Harmonic Analysis for Wind Power Plants
解胜民 1杨秀媛1
作者信息
- 1. 北京信息科技大学自动化学院,北京100192
- 折叠
摘要
Abstract
The wind turbine containing the inverter under grid connected mode will inject time-varying harmonic current into the power system.The fast Fourier transform (FFT) is currently the main method for the electrical harmonic analysis while it is not suitable for analyzing time-varying signals.A novel method for analyzing the current signal based on the wavelet packet transform is proposed.Based on the db wavelet,this method makes use of appropriate sampling frequency and the tree of the wavelet packet decomposition.The harmonic frequency tested will locate in the frequency band and the harmonic is reconstructed by using the wavelet packet coefficient.Using wavelet packet transform,the frequency band of signal can be uniformly divided and the signal features in time domain and frequency domain are extracted better.WPT also has the ability to distinguish non-stationary time-varying harmonic possesses for harmonic analysis.The result of the simulation shows that the wavelet packet transform is more effective in the analysis of the harmonic.WPT can even extract any times of harmonics.关键词
双馈风力发电机组/傅里叶变换/小波包变换/谐波分析/频率Key words
doubly-fed wind turbine generator system / Fourier transform/ wavelet packet transform/ harmonic analysis/ frequency分类
信息技术与安全科学引用本文复制引用
解胜民,杨秀媛..小波包变换在风电场谐波分析中的应用[J].电力系统及其自动化学报,2013,25(3):162-166,5.
