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An Improved Direct Torque Control with Battery Power Management of Open-End Winding Induction Motor Drive for Electric Vehicles

A dual two-level inverter fed open-end winding induction motor (OEWIM) drive with isolated batteries for electric vehicle application is presented in this paper. For uniform state-of-charge (SOC) distribution, the power flow from each isolated batteries need to be balanced. The conventional direct torque control (DTC) includes torque and stator flux control objectives without taking care of dc-link power management. An improved DTC with proper vector selection based on state of charge of batteries is proposed to regulate the power shared by each dc-link. Proper tuning is essential for controlling the SOC level of both the battery. The superiority of the proposed method in terms of power sharing based on battery SOC is demonstrated by simulation and experimental verification, and the results are presented. An experimental validation of proposed method has been demonstrated and compared with that of the conventional DTC.