Model Predictive Control With Duty Ratio Modulation for Open-Winding PMSM Drives With Common DC Bus

Finite control set model predictive current control (FCS-MPCC) has attracted increasing attention in recent years. However, large current ripples, torque ripples, and computational effort limit its widespread application. To address aforementioned problems, an improved MPCC method is proposed for open-winding permanent magnet synchronous motors herein. First, FCS-MPCC method based on deadbeat principle (FCS-MPCC-DB) is presented to reduce the computational effort. During the process, zero-sequence voltage is considered separately, avoiding enumerating all feasible voltage vectors (VVs). Second, an optimization strategy is proposed to reduce current ripples, torque ripples, and suppress zero-sequence current simultaneously. The switching state of one of two voltage-source inverters (VSIs) system is fixed, and the optimal vector duration ratios of the other VSI are obtained from a novel cost function. In other words, only one VSI system applies a fixed switching state, and a zero VV and an active VV are applied in the other VSI, so we name it half-FCS-MPCC-DB. Finally, several simulation and experimental results are presented to prove the effectiveness of proposed method.