A Novel MPC-SVM Strategy for Direct Torque Flux Control of an Induction Motor Drive System Using a Matrix Converter

This paper proposes a model predictive control space vector modulation (MPC-SVM) method for the torque and flux controls of an induction motor. The method to synthesize the reference voltage vectors according to pulse width modulation strategy and the model predictive control method that directly uses the space vector modulation method of the conventional matrix converter are described. Hence, the reference voltage vector that minimizes the cost function of the torque and flux error within the control period is selected and applied to the actual system. As a result, it is possible to perform the torque and flux control of the induction motor using only the MPC controller without a proportional-integral (PI) or hysteresis controller. Even though the proposed control algorithm is more complicated and has numerous computations compare to the conventional MPC, it can predict output voltages of the matrix converter of the SVM method and synthesize the reference voltage vectors. This feature provides the reduction in amount of calculations and the change of the control performance through the adjustment of prediction horizon N. The proposed method confirms the validity using the PSIM simulation.