SIMPLE AND EFFICIENT HIGH-PERFORMANCE PWM ALGORITHM FOR INDUCTION MOTOR DRIVES

Abstract

This paper presents a simple generalized pulse width modulation algorithm (GPWM) for induction motor drives. The conventional space vector approach requires the angle information to calculate the actual gating times of the inverter, which increases the complexity of the PWM algorithm. Hence to reduce the complexity, the proposed approach generates the actual gating times from the instantaneous sampled reference phase voltages only. Moreover, the proposed GPWM algorithm uses a unified expression for offset time from which by varying a parameter various PWM algorithms cam be generated. The current ripple characteristics of various PWM algorithms are analytically modelled. With the aid of these characteristics, high performance PWM algorithm has been developed. To verify the proposed high performance PWM algorithm, numerical simulation studies have been carried out and results have been presented.