Efficient control strategy for four-level Asymmetrical dual inverter fed induction motor drive

Abstract

This paper presents modified control strategy for four-level Asymmetrical dual inverter fed induction motor drive. In this paper a modified control strategy for the dual inverter fed induction motor drive to improve performance in all the aspects at different modulation index when compared to the exiting control strategy. With the modulation index less than 0.3 the drive is operated such that minimum switching losses take place. With the modulation index in the range 0.3 to 0.6 common mode voltage is reduced. At modulation index greater than 0.6 both control strategies have same similarities. The total harmonic distortion is also reduced with modified control strategies at low modulation indices. The simulation based analysis is carried on scalar controlled dual inverter fed induction motor drive.