Model Predictive Full-Torque Control for the Open-Winding PMSM System Driven by Dual Inverter With a Common DC Bus
Xiaoguang Zhang, Wenhan Zhang
Abstract
To eliminate the weighting factor, suppress the zero-sequence current, and reduce the computation burden in the conventional model predictive torque control (MPTC) of the open-winding permanent magnet synchronous motor (OW-PMSM) system with a common dc bus, a vector partition selection-based full-torque control is proposed. The instantaneous power theory is introduced to make the control of the torque, the flux linkage, and the zero-sequence current, which is equivalent to the control of the real torque, the virtual torque, and the zero torque. Then, the full-torque-based cost function is designed to avoid the weighting factor in the proposed method. In addition, to reduce the calculation burden caused by the large number of candidate voltage vectors, a vector partition selection strategy in 3-D space is presented. Then, the candidate vectors are reduced from 27 to 6 or 7 in every control period. Finally, the experimental results verify the effectiveness of the proposed method.