Adaptive Duty-Cycle Adjustment Based Dual-Vector Model Predictive Current Control for High Speed PMSM

The fundamental frequency of high speed permanent magnet synchronous motor (HSPMSM) is relatively high (possibly exceeding 1 kHz), which can lead to low carrier ratio. Model predictive control (MPC) has the advantages of simple principles, easy implementation, and the ability to handle nonlinear systems. Therefore, adopting MPC in HSPMSM drivers can bring better control performance. Dual-vector model predictive current control (DV-MPCC) manipulates two voltage vectors in one control cycle, which can have higher control accuracy than that of single-vector model predictive current control (SV-MPCC). However, for HSPMSM, the stator inductance of HSPMSM is minimal (10-4 H). Therefore, during start-up and low-speed operation, the stator current ripple is relatively large, which would exacerbate torque ripple. Therefore, this paper proposes an adaptive duty-cycle adjustment-based dual-vector MPCC (AD-MPCC), which can reduce stator current and torque ripple during start-up and low-speed operation. Meanwhile, an improved error-correction Smith (IEC-Smith) structure compensator is adopted, providing better delay compensation characteristics and reducing the statice error. Finally, the experimental results validate the effectiveness and feasibility of the proposed method.