Direct Torque Control Technique for Drive System Fed on Three-Level Inverter

Direct Torque Control (DTC) has the characters such as combined simplicity and robustness with excellent performance of torque control for the drive system. A DTC technique for drive system fed on three-level inverter and induction motor is presented, which means to select and compose right voltage vectors varying from speed working in constant torque area. The mathematic and simulation models of this style drive system were presented and analyzed. The simulation results confirm that the control method is very effective in optimizing the frequency of switching devices, balancing the neutral point voltage of three-level inverter, and improving drive system performance.