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Simulation of unstable oscillations in PWM variable-speed drives

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1 Author(s)
Lockwood, M. ; ERA Technol. Ltd., Leatherhead, UK

In several recent technical papers, limit-cycle instabilities of voltage source inverter-fed drives at low speeds have been attributed to the switching effects of the inverter or slight jitter in the output waveform of a proprietary LSI pulsewidth-modulated device. A study of such limit-cycle instabilities using two simulation techniques is presented. One is full simulation including the effects of inverter harmonics, anti-overlap delays, open-circuit voltages and output waveform jitter, the other is a reduced-order simulation that neglects inverter output harmonics and other output waveform defects. These simulations form part of a commercial software package under development. The simulation results indicate that the instabilities are inherent in the inverter source impedance/induction motor combination and are relatively independent of inverter output waveform harmonics, jitter, and other defects

Published in:

Industry Applications, IEEE Transactions on  (Volume:24 ,  Issue: 1 )

Date of Publication:

Jan/Feb 1988

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