Model Predictive Flux Control of Semicontrolled Open-Winding PMSG With Circulating Current Elimination

Abstract

In this article, an improved finite-control-set model predictive flux control (FCS-MPFC) is developed and implemented to eliminate the circulating current in the semicontrolled open-winding permanent magnet synchronous generator supplied by a single dc power. First, the references of torque, flux, and zero-sequence current are combined into the stator flux vector reference along with the implementation of maximum torque per ampere control to eliminate the weighting factors of the cost function in the conventional finite-control-set model predictive torque control. Then, to further improve the steady-state performance, a developed double-vector method based on the uncontrollable side voltage vector adjustment is conducted, which has the advantage of low computation burden. Moreover, a modified duty cycle control strategy is presented, in a manner where the reference value of flux is superseded with the measurement one to effectively calculate the duration of the optimal vector. Finally, experimental results verify the effectiveness and superiority of the proposed FCS-MPFC scheme.