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Published Article / I07/2007/I-009 ENY-ARTICLE-2008-111

Analysis of power quality disturbances using the S-Transform

Leonowicz, Z (Wroclaw University of Technology, Poland) ; Lobos, T (Wroclaw University of Technology, Poland) ; Wozniak, K (Wroclaw University of Technology, Poland)


Abstract: The method presented in this paper employs recently introduced S-transform which is an important development of STFT with improved properties. Proposed methods allow tracking changes in amplitude and frequency with better precision than STFT and Wigner-Ville transform. Possible applications in diagnosis and power quality problems are targeted. The S-transform outperforms the STFT in that it has a better resolution in phase space giving a fundamentally more sound time frequency representation. Investigations of the representation error show that optimally adjusted S-transform can also outperform the Wigner-Ville transform when dealing with time-frequency representations of the signal. The S- transform is also tested on nonstationary electric signals where it shows excellent tracking capability. These properties show that S-transform can be effectively used for analysis of electric signals, especially when dealing with multi-component time-varying waveforms.

Keyword(s): S-transform ; power quality ; spectral analysis
Note: XXX Międzynarodowa Konferencja z Podstaw Elektrotechniki i Teorii Obwodów. IC-SPETO 2007 , Gliwice-Ustroń, 23-26.05.2007.

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Cited by: try citation search for ENY-ARTICLE-2008-111; I07/2007/I-009

Record created 2008-03-23, last modified 2008-03-23

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