This article proposes a simplified finite-set model predictive control (FS-MPC) algorithm for full-frequency operation of five-level nested neutral-point-clamped (5L-NNPC) inverters. Compared to the existing FS-MPC of 5L-NNPC inverters, the proposed algorithm substantially reduces the computational burden and simplifies the tuning of the weighting factor while ensuring low current harmonics and full-frequency capacitor voltage balance. The full-frequency operating conditions that the candidate sets should satisfy are first acquired considering the periodic characteristics of the capacitor voltages. On this basis, a computationally efficient varying candidate set selection method is proposed for high-frequency operation, while a simple compensation set is introduced for low-frequency operation. Besides, an online approach is proposed to calculate available switching states for different candidate sets, eliminating tedious offline preprocessing. Furthermore, a staged cost function evaluation method is presented to further simplify the computation. Experimental results validate the proposed algorithm.

中文翻译：

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五级嵌套中性点钳位逆变器全频运行的简化有限集模型预测控制


本文提出了一种用于五级嵌套中性点钳位（5L-NNPC）逆变器全频运行的简化有限集模型预测控制（FS-MPC）算法。与现有的5L-NNPC逆变器的FS-MPC相比，该算法大大减少了计算负担，简化了权重因子的调整，同时保证了低电流谐波和全频电容器电压平衡。首先考虑电容器电压的周期性特性，获取候选集应满足的全频工作条件。在此基础上，针对高频操作提出了一种计算高效的变化候选集选择方法，同时针对低频操作引入了简单的补偿集。此外，提出了一种在线方法来计算不同候选集的可用开关状态，消除了繁琐的离线预处理。此外，提出了分阶段成本函数评估方法以进一步简化计算。实验结果验证了所提出的算法。