Control of an induction machine fed by an indirect matrix converter with unity displacement power factor operating with an unbalanced AC-supply

A predictive torque and flux control method for an induction machine fed by an indirect matrix converter is presented in this paper. The control scheme selects the switching state that minimizes the error in the torque and flux predictions according to their reference values. At the same time, the control scheme is enhanced by including an instantaneous reactive power minimization strategy with the goal of achieving unity displacement power factor on the input side of the converter. Through the simulation results it is shown that the predictive approach can be implemented simply with a good tracking of the torque and flux to their respective references and input currents with almost unity power factor. A behavior analysis for an unbalanced AC-supply is included, verifying the fast dynamic response of the torque and flux of the machine, where the effect of the unbalance in the AC-supply is naturally mitigated on the load side.