Simplified Control Strategy for Permanent Magnet Synchronous Motor Model Predictive Torque Control

Abstract

The predictive torque control of the traditional permanent magnet synchronous motor model traverses all 7 voltage vectors generated by the inverter, and the computational burden is relatively large. Three simplified control strategies are proposed through the combination of constraints such as torque error, flux linkage position and flux linkage error. Simplified strategy one adopts the torque error constraint. When the torque error is within the error range, the motor system directly outputs zero voltage vector, otherwise, it still traverses 7 voltage vectors. On the basis of simplified strategy I, the flux position and flux linkage error constraints are added, and simplified strategy II and simplified strategy III are proposed. The simulation and experimental results show that the permanent magnet synchronous motor system can operate normally under the control of the three simplified strategies. Compared with traditional model predictive torque control, the control effects of the three simplified strategies are basically the same. The average switching frequency is reduced to 76%, 74%, and 74%, and the average number of traverse voltage vectors is reduced to 57%, 32%, and 29, respectively. %, the total calculation time is reduced to 57.70%, 32.96%, and 29.48%. It is verified that the simplified strategy has less sacrifice to system performance, effectively reducing the computational burden of model predictive torque control and improving real-time performance.