Modular inverter topology with full-bridge sub-modules for open-end split winding three-phase induction motor drive

In this paper, a new full-bridge modular inverter topology for open-end split winding induction motor drive is presented. All bus capacitor related to a specific phase is connected in series to reach the desired voltage level required in high power and high input-voltage applications requirements. The number of inverters per phase is related to the number of pole-pairs in the machine. Single input dc bus enables flexibility between the front-end rectifier and the inverter. Three-level modulation with phase-shift is applied with carriers synchronization. A three-phase prototype featuring a multiple-winding transformer with unitary transform ratio, 1200 V dc input source and 220 V / 60 Hz ac output voltage was built in order to verify the proposed topology.