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Regular Paper | Open Access

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

Zexin Zhao1, Weijiang Chen2, Zhichang Yang3, Guoliang Zhao4, Bin Han1( ), Yunfei Xu4, Nianwen Xiang5, Shulai Wang5
China Electric Power Research Institute, Beijing 100192, China
State Grid Corporation of China, Beijing 100031, China
State Grid Smart Grid Research Institute, Beijing 102209, China
State Key Laboratory of Advanced Power Transmission Technology, Global Energy Interconnection Research Institute, Beijing 102211, China
Hefei University of Technology, Hefei 230009, China
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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.

Keywords

Branch energy balancing controldecoupled controllow-frequency AC transmissionmodular multilevel matrix converter (M3C)sequence circulating components

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CSEE Journal of Power and Energy Systems
Volume 10 Issue 1,
January 2024
Pages 235-247
DOI: 10.17775/CSEEJPES.2023.01280
Cite this article:
Zhao Z, Chen W, Yang Z, et al. Fully Decoupled Branch Energy Balancing Control Method for Modular Multilevel Matrix Converter Based on Sequence Circulating Components. CSEE Journal of Power and Energy Systems, 2024, 10(1): 235-247. https://doi.org/10.17775/CSEEJPES.2023.01280

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Received: 23 February 2023
Revised: 31 July 2023
Accepted: 14 November 2023
Published: 28 December 2023
© 2023 CSEE.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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