Model predictive control has been wildly used in the modern power electronic converter with the advantages of the multi-objective optimization, no additional modulator is required and small grid current harmonic. However, the switching operation is not constant and higher sampling frequency must be required. A novel direct power control using model predictive control (DPC-MPC) strategy is presented in this paper, which achieve the optimal vector prediction scheme with constant switching frequency operation. The calculation process is greatly simplified due to the optimal voltage vector generated directly, then, it applied to the control of a three-phase three-level T-type grid converter. A cost function is first built to balance the neutral-point-potential voltage. After then, the cost function is updated by considering the delay caused by the calculation, sampling and gate driver. Finally, a comprehensive comparative study with the conventional DPC-MPC strategy is introduced to verify the superiority of the presented DPC-MPC. The simulation and experimental results show that the steady and the transient performance of the grid current with the proposed DPC-MPC control strategy are effectively improved. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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具有直接功率控制策略的 T 型整流器的改进有限控制集模型预测控制 (FCS-MPC) 策略研究

模型预测控制以多目标优化、无需附加调制器、电网电流谐波小等优点在现代电力电子变流器中得到广泛应用。然而，开关操作不是恒定的，必须要求更高的采样频率。本文提出了一种使用模型预测控制 (DPC-MPC) 策略的新型直接功率控制，实现了具有恒定开关频率操作的最优矢量预测方案。由于直接生成最优电压矢量，大大简化了计算过程，将其应用于三相三电平T型并网变流器的控制。首先建立成本函数来平衡中性点电位电压。然后，通过考虑由计算、采样和栅极驱动器引起的延迟来更新成本函数。最后，介绍了与传统 DPC-MPC 策略的综合比较研究，以验证所提出的 DPC-MPC 的优越性。仿真和实验结果表明，所提出的DPC-MPC控制策略有效地改善了电网电流的稳态和暂态性能。© 2021 日本电气工程师协会。由 Wiley Periodicals LLC 出版。仿真和实验结果表明，所提出的DPC-MPC控制策略有效地改善了电网电流的稳态和暂态性能。© 2021 日本电气工程师协会。由 Wiley Periodicals LLC 出版。仿真和实验结果表明，所提出的DPC-MPC控制策略有效地改善了电网电流的稳态和暂态性能。© 2021 日本电气工程师协会。由 Wiley Periodicals LLC 出版。