A Weighting-Factorless Predictive Torque Control Method for Open-End Winding PMSM with Common DC Bus

Abstract

The weighting factors (WFs) of conventional predictive torque control (PTC) are difficult to tune, which limits its practical application. When the conventional PTC is applied to the open-end winding permanent magnet synchronous motor (OEW-PMSM) with a common DC bus, there are three different units of variables that require prediction and control. Therefore, it is necessary to introduce two WFs to construct the cost function (CF), which increases the difficulty of realizing the control strategy. Sequential PTC adopts the idea of hierarchical optimization to avoid the introduction of WFs directly. In this paper, the sequential PTC structure is constructed to avoid the introduction of WFs. Then, the number of elements in the finite control set (FCS) of each layer is optimized to reduce torque and zero sequences current (ZSC) ripple, so as to achieve a better control effect. Finally, the effectiveness of the proposed sequential control strategy is proved by simulation.