Power quality disturbances denoising using modified S-transform

This paper presents a new approach of power quality disturbances denoising using modified S-transform which mitigates the defect of S-transform that white noise power spectrum lineally increases with frequency. So it's more suited for analyzing noise signal than S-transform. The energy congrega...

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Bibliographic Details
Main Authors: Jiliang Yi, Jianchun Peng
Format: Conference Proceeding
Language:English
Subjects:
denoising
energy congregation level
Energy resolution
Filtering
modified S-transform
Noise level
Noise reduction
Power quality
power quality disturbances
Samarium
Signal analysis
Signal resolution
Time frequency analysis
White noise
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Summary:This paper presents a new approach of power quality disturbances denoising using modified S-transform which mitigates the defect of S-transform that white noise power spectrum lineally increases with frequency. So it's more suited for analyzing noise signal than S-transform. The energy congregation level (ECL) is defined for determining the parameter g which can adjust the time-frequency resolution. And the ECL is also utilized to determine the order of the specific element that its module use as the threshold to rectify the elements of time-frequency matrix. The quadratic change rate of ECL is defined to find the optimal iterative number used in iterating algorithm to obtain satisfactory denoising results. Inverse transform of modified S-transform is taken to get the disturbance waveform after denoising. In the end of the paper the simulations are made to illustrate the validity of the proposed method and the results comparison with wavelet-based method are given.
ISSN:2156-9681
DOI:10.1109/SUPERGEN.2009.5348266