Power Signal De-noising Based on Wavelet Analysis

Power signal of some equipment is typically non-stationary and nonlinear,inevitably,there are kinds of yawp which need being disposed.The time frequency character of wavelet transform is perfect,and it is an effective tool of analyzing non-stationary signal.Threshold de-noising based on wavelet transform is introduced,in virtue of LabVIEW plate,by simulating test,soft threshold de-noising is compared to hard threshold de-noising,and different wavelet function are selected for de-noising,the validity of threshold de-noising based on wavelet transform is proved in the process of power signal de-noising.The electrical power signal by data acquisition card in the LabVIEW developing environment,the wavelet function in Matlab is called to make the study of de-noising analysis.The signal de-noising process and testing platform based on wavelet analysis theory and virtual equipment is completed.This study idea could found the base of pushing the de-noising process effect of all kinds of signal.