A Novel FCS Model Predictive Speed Control Strategy for IPMSM Drives in Electric Vehicles

Interior permanent magnet synchronous motors (IPMSM) are widely used in electric vehicles (EV) because of its advantages of high-power density and compact structure, etc. However, EVs have placed intensive demands upon good performance of their traction drive systems. Therefore, high-performance control strategies are required to be developed. In order to obtain simple control structure and avoid tedious parameter tuning work for PI controllers, this paper proposes a novel single-loop based finite control set (FCS) model predictive speed control (MPSC) strategy. Firstly, two challenges of achieving an FCS-MPSC controller is discussed. On this ground, an FCS-MPSC controller by estimating d, q-axis currents firstly and then predicting the future speed information is developed to solve the problem that the optimal switching state cannot be determined by the current states. Then, a sliding mode load torque observer (SM-LTO) for load torque estimation is proposed to to calculate the future speed. Simulation results prove the effectiveness of the proposed FCS-MPSC controller and load torque observer.