Model Predictive Current Control for PMSM Drives With Calculation Delay Compensation

Finite control set model predictive current control (FCS-MPCC) requires a lot of calculation in the optimization process, which produced calculation delay. Calculation delay will lead to the system unable to choose the optimal control voltage at the current time, resulting in additional current ripple. To solve this problem, this paper presents a novel strategy of calculating delay estimation and compensation based on single sampling technique, which combines the reason of prediction error in permanent magnet synchronous motor (PMSM) system under delay. In the proposed strategy, the calculation delay is estimated by the difference between the predicted current and the measured current. By predicting the current changes within the calculation delay time, the measured current is compensated before predicting the future state. The proposed method is comparatively studied and compared to the conventional two-step prediction strategy. Simulation results show that the proposed compensation strategy can effectively lessen current ripple, which greatly improves the control current accuracy.