Model-Free Predictive Current Control of PMSM Using Modified Extended State Observer

This article proposes a modified model-free predictive current control (M-MFPCC) integrated with a modified extended state observer (MESO). The goal is to reduce torque ripple and improving current distortion caused by inverter nonlinearity and other system disturbances. The disturbances are precisely observed with unity gain and zero phase delay. Adaptive gain updating of the proposed observer is implemented to track the frequency of the disturbance and sustain the noise suppression performance under various operating conditions. The proposed M-MFPCC can eliminate the high frequency harmonic disturbances without requiring additional information about inverter nonlinearity or necessitating extra parameter tuning. Experimental results confirm the proposed method's efficacy in suppressing current Total Harmonic Distortion (THD) and torque ripple under a variety of load conditions.