Investigation on three-inverter fed two OEWIM drives

Abstract

The AC drive configuration presented in this article consists of two open-end winding induction motors (OWEIM) fed by three two-level inverters for EVs. One end of both the OEWIMs are connected to the output terminals of an inverter whereas the other three-phase terminals of both the OEWIMs are connected to two other inverter outputs. This proposed configuration is capable of parallel operation where they are connected to a common shaft. This topology has several advantages such as redundant switching states, half-rated DC link capacitors and power semiconductor devices. Further this results in reduction in size of the overall size of the entire configuration. The common inverter is rated for Vdc whereas the other two inverters are rated for Vdc/2, resulting in only three inverters for the entire drive system, while the conventional OEWIM require four inverters for the same operation. A fuzzy logic based (field-oriented control) FOC is used for the implementation of the proposed drive system. First the simulation studies were carried out using MATLAB/Simulink and the same has been verified using OP5600 (Hardware-in-Loop) HIL system.