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Model predictive current control (MPCC) has become one of the most promising control strategies for synchronous reluctance motor (SynRM) drive system. However, the parameters sensitivity is still a bottleneck problem for MPC, and the existing methods are not suitable for sensorless control. This paper proposes a sensorless MPCC strategy based on alternative high-frequency square-wave voltage injection (AHFSVI). The proposed methods inject an alternative high-frequency signals on dq-axis of the stator voltage, estimating rotor position, rotor speed and inductance simultaneously. By updating the inductance used in MPC per injection cycle, the proposed method can effectively suppress the impact caused by parameter mismatches. Finally, the effectiveness of the proposed method is verified by Simulink.

Synchronous reluctance motors;high-frequency square-wave voltage injection;model predictive control