Finite control set model predictive direct torque control of surface permanent magnet synchronous motor

Aiming at the problem of weight factor design of cost function in model predictive direct torque control (MP-DTC), cost function without weight factor is proposed. The control of stator flux and torque was converted to the control of stator flux and error rates. Based on MP-DTC model of surface permanent magnet synchronous motor (SPMSM), 7 basic voltage vectors of inverter were used as candidate vectors. Simulation results testify the effectiveness of the proposed strategy. Simulation results show that, due to limitation of candidate vectors, stator flux has high ripples at dynamic state. Based on effects of voltage vectors on stator flux and torque, candidate voltage vectors set was given to satisfy the control of stator flux and torque at the same time. Simulation results show the proposed candidate vectors set can suppress stator flux ripple. In order to improve real-time performance of MP-DTC system, candidate vectors set and predictive model were simplified. And MP-DTC using different candidate voltage vectors sets and predictive models were carried out using STC89C51chip. Simulation and experimental results show the simplified candidate voltage vectors sets and predictive models can decrease calculation burden and has equivalent control performance. © 2020, Harbin University of Science and Technology Publication. All right reserved.