Investigation on three-inverter fed two OEWIM drives

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 $V_{dc}$ whereas the other two inverters are rated for $V_{dc}/2$, 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.