The cascaded H‐bridge (CHB) converter can achieve rich functions, such as active rectification, active power filtering, distributed energy storage, etc. The control of the CHB converter is a multiobjective optimization problem. Finite control set model predictive control (FCS‐MPC) is an effective method developed in recent years to solve this problem. However, because of the large amount of calculation, traditional FCS‐MPC cannot be directly used to control the multilevel CHB converter. It is also difficult to tune the weighting factors in traditional FCS‐MPC. To solve these problems, this paper proposes an improved sequential MPC (IS‐MPC) method for the CHB converter. The proposed method divides the control objectives of the CHB converter into different layers according to their priorities and the control degrees of freedom of each layer can be adjusted according to the system state. Simulation and hardware‐in‐the‐loop (HIL) implementation on a three‐phase 7‐level CHB converter shows that the proposed method can effectively control the ac current and submodule voltage of the CHB converter and reduce the switching loss. Moreover, it significantly reduced the calculation burden of traditional FCS‐MPC, and the use of the weighting factors is also avoided. © 2024 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

中文翻译：

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级联H桥多电平变换器的改进序列模型预测控制

级联H桥(CHB)变换器可以实现丰富的功能，如有源整流、有源滤波、分布式储能等。CHB变换器的控制是一个多目标优化问题。有限控制集模型预测控制（FCS-MPC）是近年来发展起来的解决这一问题的有效方法。然而，由于计算量较大，传统的FCS-MPC无法直接用于控制多电平CHB变换器。传统 FCS-MPC 中的权重因子调整也很困难。为了解决这些问题，本文提出了一种改进的CHB转换器顺序MPC（IS-MPC）方法。该方法将CHB变换器的控制目标按照优先级划分为不同的层，并且每层的控制自由度可以根据系统状态进行调整。在三相七电平CHB变换器上的仿真和硬件在环（HIL）实现表明，该方法可以有效控制CHB变换器的交流电流和子模块电压，并降低开关损耗。此外，它显着减轻了传统FCS-MPC的计算负担，并且也避免了权重因子的使用。© 2024 日本电气工程师协会和 Wiley periodicals LLC。