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Published Article / ENY-ARTICLE-2008-028

Time-frequency analysis of non-stationary three phase signals

Leonowicz, Z (Wroclaw University of Technology Pl. Grunwaldzki 13, 50370 Wroclaw, Poland) ; Lobos, T (Wroclaw University of Technology Pl. Grunwaldzki 13, 50370 Wroclaw, Poland)


Abstract: New method of observation and diagnosis of inverter-fed induction motor drives is developed and tested. Unsymmetrical conditions concerning the machine impedances or valves operation are reflected in the spectrum of the current space- phasor. We estimate the spectrum of the space-phasor with the help of the Wigner-Ville distribution (WVD) and we obtain its time-frequency representation with excellent time and frequency resolution. The proposed method is tested with nonstationary multiple- component signals occurring during the fault operation of inverter-fed drives and transmission lines. Copyright © 2002 IFAC

Keyword(s): spectrum estimation ; frequency conversion ; power systems ; signal analysis ; time-frequency representation
Note: 15th Triennial World Congress of the International Federation of Automatic Control Barcelona, 21–26 July 2002 paper no 302

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Record created 2008-03-08, last modified 2008-03-09

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