volume | PIER Journals

Abstract

Aiming at the problems of adjusting the weighting factor, significant torque ripple, and insufficient robustness against load disturbances in conventional model predictive torque control (MPTC) for PMSM, an improved model predictive torque control (IMPTC) strategy incorporating a decoupled sliding mode disturbance observer (DSMDO) is proposed. Firstly, the cost function is divided into two components, and both of them are evaluated sequentially to eliminate the need for weighting factors. Secondly, the set of candidate voltage vectors (VVs) is expanded by the VVs modulation technique to reduce the torque ripple, and a low-complexity method is introduced to determine the sector. Subsequently, the action time of the optimal VV is further corrected, which enhances the control of flux while reducing computational complexity. Additionally, a novel sliding mode disturbance observer with decoupling capability is introduced, which offers feedforward compensation to the speed loop and improves system robustness against disturbances. Finally, the correctness and effectiveness of the proposed IMPTC strategy with DSMDO are proved by the experimental results.

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Dr. Yang Zhang

Mr. Ping Yang

Dr. Kun Cao

Dr. Yang Gao

Dr. Gao Tang

Dr. Qing Chen