Conventional PWM techniques give rise to considerable harmonics, at the switching frequency and its various multiples and sidebands. These elevated levels of harmonics are responsible for generating acoustic noise, vibrations, and conducted or radiated electromagnetic interference (EMI) that can adversely impact nearby systems. In this paper, a novel random PWM technique for variable frequency drives is proposed. The approach is based on having different random switching frequencies for each phase leg of the inverter. The objective is to spread the harmonic spectrum and reduce the power of the various undesired harmonics, which will help facilitate filtering for power quality, EMI, and other purposes. The performance of the proposed technique is evaluated with simulations in MATLAB/Simulink, experimentally, and is compared with other PWM techniques.
A Novel Random PWM Technique for Inverters and AC Drives
2024-06-19
1985307 byte
Conference paper
Electronic Resource
English
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