Abstract: Purpose – The purpose of this paper is to compare the accuracy of tracking the amplitude and frequency changes of non-stationary electric signals. Design/methodology/approach – Short-time fourier transform (STFT) and S-transform algorithms were applied to analyze non-stationary signals originating from switching of capacitor banks in a power system. Findings – The S-transform showed possibilities of sharp localization of basic component, and allowed improvement of tracking dynamism the transient components in comparison to STFT. Practical implications – S-transform is a better tool for the analysis non-stationary waveforms in power systems and its properties can be used for diagnostic and power quality applications. Originality/value – The dynamic tracking of the changes in time and frequency of real-like signals originating from a power system were investigated in this paper.

Keyword(s): Electric power transmission ; Fourier transforms ; Electric power systems ; S-transform
Note: Compel, Vol. 28, No. 1, 2009


Fulltext : http://zet10.ipee.pwr.wroc.pl/record/314/files/

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