Fully Decoupled Branch Energy Balancing Control Method for Modular Multilevel Matrix Converter Based on Sequence Circulating Components

IF 6.9 2区工程技术 Q2 ENERGY & FUELS CSEE Journal of Power and Energy Systems Pub Date : 2023-12-28 DOI:10.17775/CSEEJPES.2023.01280

Zexin Zhao;Weijiang Chen;Zhichang Yang;Guoliang Zhao;Bin Han;Yunfei Xu;Nianwen Xiang;Shulai Wang

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Abstract

The modular multilevel matrix converter (M3C) is a potential frequency converter for low-frequency AC transmission. However, capacitor voltage control of high-voltage and large-capacity M3C is more difficult, especially for voltage balancing between branches. To solve this problem, this paper defines sequence circulating components and theoretically analyzes the influence mechanism of different sequence circulating components on branch capacitor voltage. A fully decoupled branch energy balancing control method based on four groups of sequence circulating components is proposed. This method can control capacitor voltages of nine branches in horizontal, vertical and diagonal directions. Considering influences of both circulating current and voltage, a cross decoupled control is designed to improve control precision. Simulation results are taken from a low-frequency transmission system based on PSCAD/EMTDC, and effectiveness and precision of the proposed branch energy balancing control method are verified in the case of nonuniform parameters and an unbalanced power system.

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基于序列循环组件的模块化多电平矩阵转换器全解耦支路能量平衡控制方法

模块化多电平矩阵变流器（M3C）是一种潜在的低频交流输电变频器。然而，高电压、大容量 M3C 的电容器电压控制较为困难，尤其是支路间的电压平衡。为解决这一问题，本文定义了序列环流分量，并从理论上分析了不同序列环流分量对分支电容器电压的影响机制。本文提出了一种基于四组序列循环元件的完全解耦分支能量平衡控制方法。该方法可控制水平、垂直和对角线方向上九个分支的电容器电压。考虑到环流和电压的影响，设计了交叉解耦控制，以提高控制精度。仿真结果取自基于 PSCAD/EMTDC 的低频输电系统，在参数不均匀和电力系统不平衡的情况下，验证了所提出的分支能量平衡控制方法的有效性和精确性。

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来源期刊

CSEE Journal of Power and Energy Systems Energy-Energy (all)

CiteScore

11.80

自引率

12.70%

发文量

389

审稿时长

26 weeks

期刊介绍： The CSEE Journal of Power and Energy Systems (JPES) is an international bimonthly journal published by the Chinese Society for Electrical Engineering (CSEE) in collaboration with CEPRI (China Electric Power Research Institute) and IEEE (The Institute of Electrical and Electronics Engineers) Inc. Indexed by SCI, Scopus, INSPEC, CSAD (Chinese Science Abstracts Database), DOAJ, and ProQuest, it serves as a platform for reporting cutting-edge theories, methods, technologies, and applications shaping the development of power systems in energy transition. The journal offers authors an international platform to enhance the reach and impact of their contributions.

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