Analysis and Comparison of Basic Schemes of Synchronized PWM for Dual Inverter-Fed Drives

Two basic schemes of synchronized pulsewidth modulation (PWM) have been disseminated for control of dual inverter-fed open-end winding induction motor drives with full elimination of the common-mode voltages. The algorithms of synchronized PWM provide symmetry of the phase voltage of the system during the whole control range including the zone of overmodulation. Spectra of the motor phase voltage of dual inverter-fed drives do not contain even harmonics and sub-harmonics (combined harmonics), which is especially important for the systems with increased power rating. Analysis of processes in drive systems with two schemes of synchronized PWM, based on the modelling and simulations, has been done