Effective model predictive direct torque control for an induction motor drive

This paper proposes an effective model predictive direct torque control approach (MP DTC) for a three phase induction motor (IM) drive. With the proposed formulation, main features of new strategy as well as merits and drawbacks with respect to other control strategies developed for the three-phase IM like classic DTC, field oriented control, sliding mode control, and so on can be easily and promptly accomplished. Investigation of the speed effects on the operation methodology of the DTC procedure is presented. A sensorless speed estimation technique based on model reference adaptive system (MRAS) observer is adopted. At first, the paper gives a detailed description of theoretical approach of the proposed DTC formulation. Then the digital implementation and the sensorless technique are deeply described. Drive performance is validated by simulation using Matlab/Simulink software and experimentally using a fast control prototyping board. Results show the feasibility of the proposed technique, obtaining better speed control bandwidth while overcoming classic DTC drawbacks.