Analysis of power and power spectral density in PWM inverters with randomized switching frequency

Author

Kirlin, R. Lynn ; Bech, Michael M. ; Trzynadlowski, Andrzej M.

Author_Institution

Dept. of Electr. & Comput. Eng., Victoria Univ., BC, Canada

Volume

49

Issue

2

fYear

2002

fDate

4/1/2002 12:00:00 AM

Firstpage

486

Lastpage

499

Abstract

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

Keywords

DC-AC power convertors; PWM invertors; harmonic analysis; harmonic distortion; power conversion harmonics; spectral analysis; switching circuits; PWM inverters; harmonics; limited-pool RPWM; power analysis; power spectral density analysis; pure power spectral components; random PWM; randomized switching frequency; switching frequencies; voltage-source inverter; Acoustic noise; Acoustic pulses; Electromagnetic interference; Power system harmonics; Pulse inverters; Pulse width modulation; Pulse width modulation inverters; Space vector pulse width modulation; Switching frequency; Voltage;

fLanguage

English

Journal_Title

Industrial Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0278-0046

Type

jour

DOI

10.1109/41.993282

Filename

993282