Topology and Control Strategy of Novel Series Hybrid Modular Multilevel Converter

被引：0
|
作者：
Gong Z. [1 ]
Zhao C. [1 ]
Wu X. [1 ]
机构：
[1] School of Electrical Engineering, China University of Mining and Technology, Jiangsu Province, Xuzhou
来源：
Dianwang Jishu/Power System Technology | 2023年 / 47卷 / 11期
基金：
中国国家自然科学基金;
关键词：
capacitor voltage balance; energy release current control; modular multilevel converter; structure simplification; voltage source converter-based high voltage direct current;
D O I：
10.13335/j.1000-3673.pst.2022.1774
中图分类号：
学科分类号：
摘要：
In recent years, the modular multilevel converter (MMC) has drawn lots of interests in the voltage source converter-based high voltage direct current transmission applications due to its modular structure. The increasing the voltage level of the MMC requires more sub-modules and then leads to greater cost and bigger volumes. In order to realize the lightweight design of the MMC, a series hybrid modular multilevel converter (SHMMC) topology is proposed in this paper. The working principle is introduced and the mathematical model is deduced. Meantime, the energy release overcurrent problem in phase unit is discussed. In addition, to address the overcurrent problem, a control strategy suitable for the SHMMC topology is designed. The correctness and feasibility are verified by the Matlab/Simulink simulations and the prototype experiment. The great output and internal characteristics are also shown. Compared to the traditional MMC topology, the proposed SHMMC topology requires less sub-modules and removes the arm inductors under the same DC voltage, which helps reduce the device volume and realize the lightweight design. On the premise of ensuring good output characteristics, the SHMMC has a lower power loss. © 2023 Power System Technology Press. All rights reserved.
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页码：4688 / 4697
页数：9
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