RANDOM PULSE-WIDTH MODULATION TECHNIQUES FOR CONVERTER-FED DRIVE SYSTEMS - A REVIEW

Random pulse width modulation (RPWM) techniques for voltage-controlled power electronic converters have been attracting an increasing intere st due to the unique effects of these techniques on the converter-supp lied drive systems. A number of RPWM strategies have been reported and a beneficial impact on the acoustic noise and vibration has been unan imously agreed upon. The paper presents a synthetic review of the stat e of the art in the RPWM theory and practice. Topics covered include p rinciples of RPWM, means of randomization, review of the existing RPWM techniques, power spectra, implementation issues, and documented effe cts of RPWM on electric drive systems.