Finite Control Set Model Predictive Control for Switched Reluctance Motor Drives with Reduced Torque Tracking Error

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In this paper, a new method to reduce the steady state torque tracking error of finite control set model predictive torque control for switched reluctance motor drives is proposed. The steady state tracking error is considered as one of the main shortcomings of the conventional Finite Control Set Model Predictive Control (FCS-MPC). This can happen due to parameter uncertainties or when the multiple objectives are achieved by a single function with weighting factors. In the conventional model predictive torque control for SRM, the control action is obtained by a multi-objective cost function designed to track a reference torque while minimizing the phase currents over the prediction horizon. The optimal switching state which minimizes the cost function is selected and applied at each switching instant, which results in the steady state torque tracking error. In this paper, a compensation term is added to the reference torque at each sample instant to minimize the torque tracking error. The compensation term is calculated based on the estimated average torque tracking error in the previous sample times. Simulations on a three phase, 12/8, 2.3 kW SRM show promising results with the proposed method as compared to the conventional FCS-MPC.