Unidirectional Finite Control Set-Predictive Torque Control of IPMSM Fed by Three-Level NPC Inverter with Simplified Voltage-Vector Lookup Table

This paper proposes a unidirectional finite control set-predictive toque (UFCS-PTC) method for three-level neutral-point-clamped (3L-NPC) inverter fed interior permanent magnet synchronous motor (IPMSM). The proposed algorithm can lower the complexity of PTC by 3L-NPC reducing number admissible voltage vectors (VVs) effectively. candidate VVs are restricted within 60° space diagram (VSVD), which is nearest to flux trajectory each sector. After segmentation VSVD and trajectory, keep in one direction during prediction process, result significant torque/flux reduction. Therefore, UFCS-PTC reduce from twenty-seven six while achieving excellent steady-state performance terms reduced torque ripples. Additionally, eliminates need weighting factor calculation neutral point associated with inverter. IPMSM also has other features, such as improved balancing capability DC-link capacitors’ voltage, small computation time due considered cost function, easy implementation. effectiveness verified through experimental results.