Model Predictive Current Control of Open-winding PMSM Based on Zero Sequence Current Suppression

Abstract:
A hybrid three-vector model predictive current control (MPCC) for open winding permanent magnet synchronous motor (OW-PMSM) is proposed in this paper. The fast voltage-vector selection method is used to select one non-zero voltage vector to act on inverter1 (INV1) in each control period. Then, inverter2 (INV2) adopts the voltage vectors selection method that considers the zero sequence voltage layering, according to the layering of the zero sequence voltage reference value and the magnitude of the plane reference voltage of the alphabeta-axes, the range of candidate voltage vectors can be narrowed and the calculation amount of the control process can be reduced. At the same time, the action time of voltage vector (VV) is calculated by using the deadbeat of the dqaxes current, and the optimal voltage vectors of inverter2 (INV2) are selected by adding the value function of the zero sequence current (ZSC) error term, which effectively suppresses the zero sequence current (ZSC), and improves the steadystate control effect of the system. The experimental results verify the effectiveness of the proposed method.