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Application of Improved Wavelet Threshold De-noising to the Power Quality Detection
Author(s): 
Pages: 220-224
Year: Issue:  4
Journal: Journal of Liaoning Institute of Technology(Natural Science Edition)

Keyword:  de-noising3σ rulesoft-hard threshold function compromise methodμ-threshold method;
Abstract: According to the shortcomings that wavelet soft threshold de-noising has fixed deviation, hard threshold de-noising is discontinuous and characteristics of power system signal, this paper proposes an improved signal de-noising method. This method uses the “3σrules” to select the threshold, combines soft-hard threshold function compromise de-noising method with μ-threshold method to de-noise the signal. The improved de-noising method can eliminate the noise more efficiently, retains the useful signal better and improves the effect of signal de-noising. The results of MATLAB simulation verify that the method can present the characteristics of the signal better, make the signal smooth and achieves better results.
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