ANALYSIS OF THREE PHASE SIGNAL USING WIGNER SPECTRUM

Z. Leonowicz, T. Lobos

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 spacephasor. 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.

Keywords

spectral estimation, Wigner-Ville distribution, space-phasor

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IMEKO-WC-2000-TC10-P267.pdf

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IMEKO TC

TC10 - Measurement for Diagnostics, Optimization and Control

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