Multi-step predictive control with three-level SVPWM technique in direct torque controlled three-phase induction motor

Abstract

The simple idea of predictive control is to predict the next step of the variables behaviour of a system, then a controller is used to predict values for predefined an optimization process in order to estimate the optimum control commands. In recent years, the predictive control was used to control different drives in order to improve the performance of the controlled machines. This paper employs the Model Predictive Torque Control (MPTC) to implement multi-step prediction for stator current, stator flux in Direct Torque Control (DTC) strategy of three-phase induction motor to predict the more efficient voltage vector that drive a three-level Space Vector Pulse Width Modulation (SVPWM) inverter. The Matlab/Simulink software is used to carry the performance characteristic of a high power, 1250hp three-phase induction motor. The results reflect 12.7% reduction in torque ripple for three prediction steps compared with single.