TAILIEUCHUNG - Voltage flicker detecting based on improved HHT

This paper puts forward a new method based on Hilbert-Huang Transform (HHT) and Wavelet denoising for extracting feature information of voltage flicker signal. Firstly, envelope signal could be extracted by using HHT from original signal containing noises. | 38 The Open Electrical Electronic Engineering Journal 2017 11 38-47 Send Orders for Reprints to reprints@ BENTHAM OPEN CrossMark The Open Electrical Electronic Engineering Journal Content list available at TOEEJ DOI 1874129001711010038 RESEARCH ARTICLE Voltage Flicker Detecting Based on Improved HHT Xiyu Xu Zhenmei Li Rui Ma Haitao Li and Fuwei Zhang School of Electric and Electronic Engineering Shandong University of Technology Zibo 255049 China Received May 25 2016 Revised November 08 2016 Accepted December 08 2016 Abstract This paper puts forward a new method based on Hilbert-Huang Transform HHT and Wavelet denoising for extracting feature information of voltage flicker signal. Firstly envelope signal could be extracted by using HHT from original signal containing noises. Then the noises and higher harmonic components of envelope signal could be removed by using Wavelet denoising. Finally the noise-removing envelope signal could be decomposed by using Empirical Mode Decomposition EMD for getting accurate amplitude modulation wave. The new method was applied to virtual instrument by using the MATLAB script node in LabVIEW. Experimental results show that this new method is applicable for analyzing voltage flicker signal both in time domain and frequency domain. The accurate time amplitude and frequency of voltage flicker signal which is mutational and non-stationary can be obtained by using this new method. Keywords HHT EMD Envelope Flicker Wavelet denoising. 1. INTRODUCTION With the development of industrial technology a large number of high-power and variable loads have been incorporated into the power grid such as rolling mill electric locomotive electric arc furnace etc. 1 2 . When the reactive power and active power of these equipment change sharply a lot of voltage fluctuation and flicker will appear in the distribution system which brings great harm to normal production 3 4 . Therefore voltage fluctuation and .

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