Harmonic imbalance in asynchronous PWM schemes

TitleHarmonic imbalance in asynchronous PWM schemes
Publication TypeConference Paper
Year of Publication1991
AuthorsDunford, W. G., and J. D. Van Wyk
Conference NamePower Electronics Specialists Conference, 1991. PESC '91 Record., 22nd Annual IEEE
Pagination397 -401
Date Publishedjun.
Keywords3-phase invertor, asynchronous 3-phase PWM, blanking time, harmonic imbalance, harmonics, invertors, nonintegral harmonic line currents, pulse width modulation, quantization time

The harmonic content, both integral and non-integral, of an asynchronous three-phase PWM scheme is analyzed. The effects of both quantization and blanking time are included. It has been shown that in a three-phase inverter with asynchronous modulation the nonintegral harmonic line currents produced form unbalanced sets. The percentage imbalance for a particular order is a function of the harmonic order only. For practical frequency ratios, the absolute amplitude of the current imbalance is small due to the small amplitude of the nonintegral components


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