A Frequency-Domain Linear ADR-Based Speed Control in Saddle-Shaped Model Predictive Current Control for PMSM

Abstract

A Linear-Active-Disturbance-Rejection-based Saddle-Shaped Model Predictive Current Control (LADR-SS-MPCC) strategy is proposed in this paper for a Permanent Magnet Synchronous Motor (PMSM) driving system. In the proposed method, a Linear-Active-Disturbance-Rejection-based (LADR-) structure compensates the unknown disturbances including predictive current errors and load torque fluctuations. Combined with the frequency-domain method of proportional-integral (PI) controller, the parameter sensitivities of Model Predictive Current Control (MPCC) and tuning method of the LADR-structure are analyzed in detail, and the influence and implementation of saddle-shaped and inserted harmonic waveforms for MPCC are also presented to improving current harmonics. Compared with the Proportional-integral MPCC (PI-MPCC) and the conventional LADR-MPCC strategies, the advantages including dynamics, robustness and stator current harmonic amplitudes are demonstrated by simulation and experimental results.