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Preprint / ENY-PREPRINT-2008-005

Analysis of Non-Stationary Signals in Power Systems using Wigner Transform and Min-Norm Method

Leonowicz, Z (Wroclaw University of Technology, Poland)


Abstract: Time-varying spectra of non-stationary time-series commonly used are spectrograms from the Short-Time Fourier Transform (STFT). The most prominent limitation of the Fourier Transform is that of frequency resolution. To overcome the limitations the Wigner-Ville Distribution and the Min-Norm subspace method have been applied for spectrum estimation of non-stationary signals caused by switching on capacitor banks and by a short circuit at the output of a frequency converter. Investigation results confirm the advantages of the advanced methods.

Keyword(s): EEEIC
Note: Proceedings of the 7th Int. Conference EEEIC 2008, Cottbus, 5-11.05.2008, pp. 43-46

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Rekord stworzony 2008-03-16, ostatnia modyfikacja 2008-05-31

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