Predictive torque control of a multi-drive system based on a two-stage six-leg matrix converter with unity input power factor

This paper proposes a predictive torque and flux control for a multi-motor drive system. The scheme is based on a six-leg indirect matrix converter used to drive two induction machines operating at the same speed even under different load torque conditions. By using the mathematical model of the converter (input filter and switches) and machines, the proposed control scheme selects the switching state that minimizes the error in the torque, flux and reactive power predictions, according to their reference values. Through simulation results it is shown that the predictive approach can be simply implemented with a good tracking of the controlled variables to their respective references. The results verify the fast dynamic response of the torque in both machines and demonstrate effective compensation of reactive power in transient and steady state.