Analysis of power and power spectral density in PWM inverters withrandomized switching frequency
Kirlin, R.L.; Bech, M.M.; Trzynadlowski, A.M.
Industrial Electronics, IEEE Transactions on
Volume 49, Issue 2, Apr 2002 Page(s):486 - 499
Digital Object Identifier   10.1109/41.993282
Summary:A novel method for accurate calculation of power spectra of the pulsewidth modulation (PWM) voltage-source inverter with randomized switching frequency is presented. The case of a limited pool of switching frequencies, convenient and adequate for technical purposes, is considered, and a mathematical background for this type of random PWM (RPWM) is provided. It is shown that the limited-pool RPWM gives rise to not only a continuous spectrum, but, also, under certain circumstances, pure power spectral components (harmonics), typical for the deterministic PWM. Criteria for the existence of harmonics are given, and formulae for both the power and the power spectral density are derived and verified experimentally

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