Improved Torque Performance of SynRM Based on Multiple Resonat and Cascade Extended State Observer Control

The control performance of synchronous reluctance motor (SynRM) deteriorates because of the non-uniform reluctance of motor, magnetic saturation and cross-coupling effect, leading to torque ripple. To improve the torque performance, a composite control method based on multi-resonant speed control and the ultra-local model-based deadbeat predictive current (ULM-DPCC) control is proposed. First, multi-resonant controller (MRC) is proposed to suppress torque harmonics. Second, the cascade extended state observer (CESO) is proposed to predict the currents and estimate the disturbances when inductance mismatch occurs. Then ULM-DPCC is used to improve the performance of conventional DPCC. On the whole, torque harmonics are significantly decreased while the anti-interference performance of the current loop is improved. Finally, torque performance is improved based on multiple resonat and cascade extended state observer control by the simulation.