开绕组永磁同步电机四桥臂控制系统预测电流策略研究

ompared to conventional open-winding synchronous motor systems employing dual inverters, the four-leg converter system significantly reduces cost while maintaining the same utilization of the DC bus voltage. In this paper, a method based on optimal voltage vector fast selection and deadbeat predictive current control is presented for suppressing zero-sequence current in the four-leg converter open-winding permanent magnet synchronous motor control system. Firstly, the mathematical model of the common DC bus four-leg converter system and the voltage vector distribution in the αβ plane are analyzed; secondly, the model predictive current algorithm is employed for control. On this basis, a spatial voltage vector distribution system in the abc coordinate system is established, and the geometric spatial relationship is analyzed to provide a method for selecting the optimal voltage vector; finally, a zero-axis voltage prediction equation is established, and the mid-vector modulation method is adopted to present a zero-sequence current suppression strategy based on deadbeat predictive current control. Research results demonstrate that the proposed control strategy can significantly suppress zero-sequence current and improve the dynamic and steady-state performance of the system without requiring complex value function calculations, significantly reducing computation. Simulation validates the correctness of the proposed control method.