SVPWM-based predictive current controller for four-quadrant induction motor drive system

This paper proposes an improved SVPWM-based digital predictive current controller for grid-side of motor energy feedback inverters. Firstly, a predictive current control strategy in the inner loop was adopted to minimize the system delay and improve the current response so that the grid-side current harmonics can be sharply reduced. Besides, load current feedforward compensation was added to reduce the dc-voltage ripples when the load was abruptly changed, so that dc bus voltage can be kept at a demand level during the regenerative feedback condition of the motor. MATLAB-based Simulation studies of a induction generation system were carried out to confirm the overall efficiency of the system and the superior dynamic performance. 1.5 kw experiment results also validate the correctness of proposed strategy.