Current Control of a Three-Leg Inverter in the Stationary Frame for a Two-Phase Induction Motor

Abstract

This paper investigates current control of a three-leg voltage source inverter (VSI) supplying a two-phase induction motor (TPIM). First, the mathematical model of this system is established and two conventional current control strategies for conventional three-leg VSI in the stationary frame are presented. Then a novel control method using two closed loops with an optimized proportional and resonant (PR) controller and a novel algorithm modulating the potential of neutral leg middle point based on its average switching state equations is proposed. Also, a comparison between these three methods is presented. Both computer simulation and experiment results show the effectiveness of the proposed method in achieving better performance in terms of THD, peak overshoot value.