Comparison of Dynamic Performance of Field Oriented Control and Model Predictive Control for Line Start Permanent Magnet Synchronous Machine

This paper presents a comparative analysis of the dynamic performance of Field-Oriented Control (FOC) and Finite Control-Set Model Predictive Torque Control (FCSMPTC) for Line-Start Permanent Magnet Synchronous Motors (LSPMSM) with a modified flux observer. The developed observer is based on a modified indirect current method that employs current measurements to improve induction and permanent magnet flux estimation at the stator, which is critical for optimizing the drive's dynamic response. The real-time experimental performances of both FOC and FCS-MPTC techniques are evaluated under the same operating conditions to assess their transient and steady-state responses. Additionally, investigating the results for FCS-MPTC demonstrates its advantages in terms of faster dynamic response and lower steady-state torque and flux ripples compared to FOC. Furthermore, the performance advantages of FCS-MPTC are realized without requiring extensive tuning of cascaded PI loops, which is necessary for FOC. Since PMSM requires a sophisticated startup mechanism while producing similar steady-state performance compared to LSPMSM, this research provides insights into the trade-offs between FOC and FCS-MPTC for LSPMSM with the modified flux observer.