DIRECT TORQUE CONTROL BASED ON SPACE VECTOR MODULATION WITH BALANCING STRATEGY OF DUAL STAR INDUCTION MOTOR
Keywords:
Double star induction machine, Balancing strategy, Five-level inverter, Direct torque control, Space vector modulationAbstract
This paper concerns the study of direct torque control (DTC) based on space vector modulation for a double star induction machine fed by two five-level diode-clamped inverters. This control is proposed to solve the drawbacks of the conventional DTC based on electromagnetic torque and stator flux hysteresis controllers. In the case of multilevel inverters-based drive, the operation with unbalanced voltage in the dc-bus affects the drive performances due to the generation of uncharacteristic harmonics in each inverter output voltage as well as the presence of overvoltages across the semiconductors. For this reason, a DTC using capacitor voltage balancing strategy to maintain the neutral-point balance is presented. Simulation results, considering different work conditions, are presented to validate the good performance of the proposed control method.
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