关键词: 永磁同步电机, 三相四开关容错逆变器, 模型预测控制, 有限控制集模型预测控制, 离散滑模控制, 离散扰动观测器

Abstract: In order to improve the performance of permanent magnet synchronous motor fed by three-phase four-switch fault-tolerant inverter, a dual closed-loop predictive control strategy is developed. A model predictive control method with disturbance compensation is designed in the speed loop. The discrete disturbance observer is used as the estimation of load disturbance to make feedforward compensation of speed loop. The expected value of the [q] axis current loop is obtained by combining with the output of model predictive speed control and disturbance compensation value. A finite control set model predictive control method based on discrete sliding mode control is designed in the current loop. Compared with traditional PI and FCS-MPC method, the simulation results show that the proposed method has better dynamic response performance and strong robustness, when the speed regulation system of permanent magnet synchronous motor fed by fault-tolerant inverter starts without load and is affected by sudden change of given speed, load disturbance and parameter variation.

Key words: permanent magnet synchronous motor, three-phase four-switch fault-tolerant inverter, model predictive control, finite control set model predictive control, discrete sliding mode control, discrete disturbance observer