Control strategies for dual inverter fed vector controlled induction motor drive

This paper presents a comparative study of various control strategies for dual inverter configuration–based vector controlled drive. The proposed inverter is able to operate as two–level inverter and three–level inverter at different modulation index (M). At high modulating index both inverters are in operation and produce three–level output voltage which produces less current ripple. At low modulation index two–level output voltage is obtained by operating one inverter or two inverters. At lower modulation index, the operation of a single inverter results in reduced current ripple, switching losses, common mode voltage, and voltage stress on switching devices when compared with the two inverter operation. To validate the proposed work numerical simulation has been carried out in MALAB/Simulink environment.