MULTI-LEVEL SVM FOR SIX-PHASE MULTI-LEVEL INVERTERS TO DRIVE DUAL STATOR INDUCTION MACHINE

This article proposes a new six-phase multi-level space vector modulation (SVM) method to control a six-phase induction machine (SPIM) driven by a multi-level separate direct current (DC) source (SDCS) inverter. The main idea is to control the six-phase multilevel inverter by extending the SVM algorithm developed for the three-phase multi-level inverters. This allows one to have a new modulation technique for a six-phase multi-level inverter and a great simplification of the classical six-phase SVM control algorithm. The Park's transformation is used to obtain two decoupled space vectors (d-q frame and x-y frame) of the six-phase inverter. The components (d-q) being responsible for the electromechanical energy conversion in the SPIM are employed to implement an appropriate SVM technique for six-phase inverters to obtain six-phase components of the output voltage vectors, so the components (x-y) are eliminated. For that, the d-q frame is used to obtain a simple and general algorithm for this six-phase multi-level inverter. Some appropriate numerical simulations that involve an SPIM drive with a multi-level SDCS inverter are conducted to highlight the performance of the proposed six-phase SVM and to verify the accuracy of the proposed algorithm. The simulation results show clearly that the proposed multi-level topologies can adequately reduce the total harmonic distortion (THD) distortion of the currents as well as the total losses of the semiconductors.