T型三电平单相逆变器有限开关状态模型预测控制方法

Finite switching state model predictive control for T-type three-level single-phase inverters

针对单相逆变器的特点,提出一种基于T型三电平单相逆变器有限开关状态模型预测控制方法。在静止坐标系下建立T型三电平单相逆变器基于期望电压矢量的预测模型,大大减少有限开关状态模型预测控制中预测模型的计算量。在目标函数中构造电流跟踪和T型三电平中性点电压平衡目标项,实现给定电流快速、精确跟踪以及中性点电压平衡控制。最后,建立起基于T型三电平单相逆变器实验平台,对所提的有限开关状态模型预测控制进行测试。实验结果表明:所提出模型预测方法使系统具有良好的静、动态性能。

For the characteristic of a single-phase inverter,a finite switching state model predictive control(FSS-MPC)based on T-type single-phase inverters is proposed in this paper.The predictive model was established based on expected voltage vectors for T-type three-level single-phase inverters in the stationary coordinate reference,which greatly reduced the calculation burden for the predictive model of the FSS-MPC.The target items of current tracking and T-type three-level neutral-point voltage balancing are constructed in the cost function,which can achieve rapid given currents,accurate tracking and balancing neutral-point voltage.Finally,a T-type three-level single-phase inverter experimental platform was established.The steady-state and dynamic experiments were carried out for the proposed FSS-MPC.The experimental results show that the proposed MPC algorithm has good steady-state and dynamic performance.