Model Predictive Control Strategy for MMC Under Low Frequency

被引：0
|
作者：
Zhang L. [1 ]
Xiong Y. [1 ]
Wang L. [1 ]
Kang Z. [1 ]
Ma R. [1 ]
机构：
[1] College of Electric Engineering, Dalian University of Technology, Liaoning Province, Dalian
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 04期
关键词：
arm-voltage difference control; low-frequency control; model predictive control (MPC); modular multilevel converter (MMC); sub-module voltage balancing;
D O I：
10.13334/j.0258-8013.pcsee.212644
中图分类号：
学科分类号：
摘要：
Modular multilevel converter (MMC) has broad application prospects in marine electric propulsion systems, electric traction systems and variable frequency drives. However, the sub-module (SM) capacitor voltage fluctuates sharply when MMC is started or running at low frequency, which endangers the safe operation of the modular multilevel converter system seriously. In this paper, a model predictive control strategy with low-frequency SM capacitor voltage fluctuation suppression is proposed for MMC. The current prediction model containing high-frequency common-mode voltage and the arm-voltage difference prediction model are built. A unified control cost function is constructed to evaluate the error between the reference value and measured value. In the optimization process, the 2N+1-level output mode is used to provide more choice freedom of the optimal control for MMC at low frequency. In order to verify the feasibility and effectiveness of the proposed control strategy, simulation and experimental researches are carried out. The results show that the proposed control strategy can suppress the SM capacitor voltage fluctuation effectively, reduce the harmonic content of the output currents and enhance the safe operation capability of the MMC system. ©2023 Chin.Soc.for Elec.Eng.
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页码：1547 / 1555
页数：8
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