Analysis of non‐stationary electric signals using the S‐transform

• Zbigniew Leonowicz ^[1] ; Tadeusz Lobos ^[1] ; Krzysztof Wozniak ^[1]
  1. [1] Wrocław University of Technology

     Wrocław University of Technology

     Breslavia, Polonia

     
• Localización: Compel: International journal for computation and mathematics in electrical and electronic engineering, ISSN 0332-1649, Vol. 28, Nº Extra 1 (Special Issue: Selected Papers from ISTET 2007), 2009, págs. 204-210
• Idioma: inglés
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• Resumen

  • 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 the 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 of 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 are investigated in this paper.