Predictive Control of Permanent Magnet Synchronous Motor based on the Circular Current Error Boundary

The traditional high-performance speed control system of permanent magnet synchronous motor (PMSM) mostly adopts the field-oriented control strategy based on SVPWM (SVPWM-based FOC), but its excellent control performance depends on high switching frequency. The current distortion will increase significantly along with the decline of switching frequency. Therefore, this paper proposes a predictive control strategy of PMSM based on the boundary of the circular current error. This strategy is based on the idea of predictive control and uses the circular boundary to restrain the current distortion. The strategy predicts all the possible current trajectories under the action of different voltage vectors, and switches the switching state of the inverter only when the current vector exceeds the boundary. It can reduce the switching frequency effectively while maintaining low current distortion. Through simulation tests, it shows that this strategy can obtain satisfactory dynamic and static characteristics at a low switching frequency.