Torque and current enhancement based on dual open-end stator winding IM at 0° fed by two 2-level cascaded inverters

This paper aims to study the performances of the dual open-end stator winding asynchronous machine with 0 degrees shifting supplied by two 2-level cascaded inverters. To establish this study, the effects of shifting in both cases 0 degrees and 30 degrees are analyzed, when the machine is fed by four classical inverters (two 2-level inverters for each winding input). The obtained simulation results prove that with 30 degrees, the machine offers good torque quality but decreases the quality of phase current. To overcome this limitation, the dual open-end stator winding machine at 0 degrees is supplied by four multilevel converters. Each converter is constituted by two 2-level classical inverters in cascading. This structure allows to increase the number of levels of the voltage and to improve the electromagnetic torque while providing better current quality in the stator. The obtained simulation results for the two shifts and for the two used converters confirm the important advantage of the association of this machine at zero shift with two 2-level classical inverters in cascading.