In this paper, a new Lyapunov-based model predictive controller is proposed for a 7-level packed U-cell (PUC7) grid-connected inverter. A cost function of the proposed model predictive controller is designed from the system stability point of view, inspired by the Lyapunov control theory. The proposed controller eliminates the need for gains that are associated with cost function coefficients, as seen in classical model predictive control based controllers. Therefore, the control design problem is significantly simplified. In addition, the average switching frequency is also reduced, as shown in both simulation and experimental results, leading to a reduction in switching losses. Simulation and experimental tests, on a PUC7 lab prototype, demonstrate the excellent performance of the proposed control system, in terms of high disturbance rejection, robustness to parameter mismatches, and fast dynamic response. Such features qualify the proposed control strategy as a good candidate for grid-tied applications.

中文翻译：

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PUC7并网多电平逆变器基于Lyapunov的模型预测控制


本文针对 7 级封装 U 单元（PUC7）并网逆变器提出了一种新的基于 Lyapunov 的模型预测控制器。受李亚普诺夫控制理论的启发，从系统稳定性的角度设计了模型预测控制器的成本函数。所提出的控制器消除了对与成本函数系数相关的增益的需要，如基于经典模型预测控制的控制器中所见。因此，控制设计问题得到了显着简化。此外，如仿真和实验结果所示，平均开关频率也降低了，从而降低了开关损耗。在 PUC7 实验室原型上进行的仿真和实验测试证明了所提出的控制系统在高抗扰性、对参数失配的鲁棒性和快速动态响应方面的出色性能。这些特性使所提出的控制策略成为并网应用的良好候选者。