准Z源逆变器驱动永磁同步电机的有限集模型预测控制

针对准Z源逆变器(qZSI)驱动永磁同步电机(PMSM)系统的特点,在两相静止坐标系下,提出一种有限集模型预测控制策略。由准Z源网络电容电压闭环与PMSM电磁功率前馈生成电感电流参考值,通过预测电感电流值并引入子代价函数来确定是否选择直通(ST)状态,以实现qZSI的升压控制。在非直通(NST)状态下,分别对8种开关状态下的PMSM定子电流进行预测,并与转速闭环控制生成的参考电流进行比较,选择最优的开关状态,以实现对PMSM的控制。仿真结果表明,所提控制策略可实现对qZSI的升压及PMSM转速的控制,系统具有良好的稳态及动态性能。

Finite Control Set Model Predictive Control for Permanent MagnetSynchronous Motor Using QuasiZSource Inverter

According to the characteristics of permanent magnet synchronous motor (PMSM) system using quasiZsource inverter (qZSI), a finite control set model predictive control strategy was proposed in twophase stationary coordinate system. The reference value of inductance current was generated by controlling the capacitance voltage of quasiZsource network, and combining with the electromagnetic power feedforward value of PMSM. By predicting the inductance current value and introducing the subcost function, either the shootthrough (ST) case or nonST (NST) case was determined to realize the boost control of qZSI. In the NST case, the stator current of PMSM was predicted in eight switching states, and compared with the reference current generated by the speed closedloop control. The optimal switching state was selected to achieve the control of PMSM. The simulation results showed that the proposed control strategy could realize the boost control of qZSI and the speed control of PMSM. The system had good steadystate and dynamic performance.