Harmonic Detection Of Wind Electric Field Based On Wavelet Transform

Wavelet transform technology in recent years in the field of harmonic detection technology has aroused widespread concern. As the number of China's wind electric field growing,Harmonic power grids have become more polluted. In order to guarantee electrical network's safe operation, that is necessary to carry on the examination to electrical network's harmonic, according to their results to take the necessary protective measures to strictly control its hazards.According to the internal and overseas actualities, and Wavelet transform's advantages and disadvantages are analyzed and compared, In this paper , combination wavelet and four types of wavelet functions and associated wavelet transform with multi-frequency bands.Wavelet transforms with multi-frequency bands can detect many harmonic parts of signal having good frequency characteristics. Moreover , in this paper wavelet transforms with multi-frequency bands are applied to power system harmonic analysis , it is shown that wavelet transforms with multi-frequency bands are effective methods in certain aspects , and obviously possessed of social and economic results. And methods of power system inter-harmonic detection in wind electric field based on wavelet transform.Main work and research results include:1. Methods of power system harmonic detection in wind electric field based on wavelet transform with Single bands.2. Methods of power system harmonic detection in wind electric field based on wavelet transform with multi-frequency bands.3. Methods of power system harmonic detection in wind electric field based on portfolio wavelet.4. Methods of power system inter-harmonic detection in wind electric field based on wavelet transform.This paper on the wavelet transform the theory of wind power system harmonics detection field of application of the study and exploration, Given the relevant harmonic detection example, and has been a relatively good results.