Comparison of Different Sampled PWM Strategies Applied to High-Speed Drives: A Predictive Time-Frequency Analysis

Abstract

Using the Predictive Time-Frequency Analysis, several different pulse width modulation (PWM) techniques are studied with naturally and regular sampled PWM. This study observes a dynamic trajectory modelling an electric drive chain with a constant acceleration of the machine to its nominal speed. This global method allows to observe different phenomena at the same time (resonance, sub-harmonics, and harmonic distortion) specific to the trajectory. The Predictive Time-Frequency Analysis applied to Electric Drive Systems (PreTiFEDS) highlights the reasons why a naturally sampled PWM is not necessarily the most appropriate when it comes to using other PWM strategies for high-speed applications.