Multilevel Torque Hysteresis-Band Based Direct-Torque Control Strategy for a Three-Level Open-End Winding Induction Motor Drive for Electric Vehicle Applications

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Abstract
The number of levels present in the torque-hysteresis controller influence the performance of the Direct Torque Controlled (DTC) induction motor drives. In this paper, the effects of the number of levels in the Torque-Hysteresis-Band-Controllers (THBCs) on the performance of the conventional DTC based three-level open-end winding induction motor drives are reported. A power-loss evaluation model was employed to investigate the influence of the number of levels present in THBC on the switching and conduction losses occurring in the dual-inverter system. The performance indices considered in this study are: (i) the fluxripple (ii) the torque-ripple and (iii) the total power-loss in the dual-inverter system. Furthermore, these performance indices are evaluated with a newly emerging control strategy, namely, the Predictive Torque Control (PTC) and are compared with those obtained with the DTC. The simulation results are validated by showing the experimental results.

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