An Improved Sensorless control strategy for SynRM Model Predictive Current Control Based on High-Frequency Square-wave Voltage Injection

Synchronous reluctance motors (SynRM) have been widely used in multiple fields. For SynRM, model predictive current control (MPCC) is one of the popular control methods nowadays. However, due to the current ripple caused by MPCC characteristics, sensorless control strategies cannot perform satisfactorily, which limits the application of MPC when sensorless control is required. The proposed method uses current prediction value to reduce the error of calculated high-frequency (HF) response, and estimates the rotor position and speed via compensated HF signal. This method can greatly improve the dynamic and static position estimation accuracy. Finally, the effectiveness of the improved strategy is proved by MATLAB/Simulink software.