Dual Four-stage-vector Model Predictive Control for OW-PMSM Drives

A novel dual four-stage-vector model predictive control (MPC) strategy for open-winding permanent magnet synchronous motor (OW-PMSM) drives is put forward in this article. In each control period, four vectors, including two non-zero vectors and two zero vectors, are applied to the dual-inverter. According to the principle of minimum number of switches, two non-zero vectors are applied in the middle of the control period, while the two zero vectors are distributed at the beginning and the ending of the control period, significantly reducing the control frequency. In addition, two zero vectors of inverter2 (INV2) are optimally distributed to inhibit the flow of zero-sequence current (ZSC). Therefore, the ZSC of the system is well-suppressed. Finally, compared to the conventional strategy, the control performance of the proposed strategy is proved by an experimental platform with a 1.25kW OW-PMSM.