Journal of Shanghai Jiao Tong University

Journal of Shanghai Jiaotong University >

2025 , Vol. 59 >Issue 2: 242 - 251

DOI: https://doi.org/10.16183/j.cnki.jsjtu.2023.193

New Type Power System and the Integrated Energy

Circulating Current Suppression Strategy of Modular Multilevel Matrix Converter Based on Quasi-Proportional Resonant Control

  • JIANG Yafeng ,
  • LI Yibo ,
  • WU Qiuwei ,
  • LIU Shenquan ,
  • WU Xiaodan ,
  • ZHOU Qian
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  • 1. School of Electrical Engineering, Shandong University, Jinan 250061, China
    2. Tsinghua Berkeley Shenzhen Institute, Tsinghua University, Shenzhen 518055, Guangdong, China
    3. Tsinghua Shenzhen International Graduate Institute, Tsinghua University, Shenzhen 518055, Guangdong, China
    4. School of Electrical Engineering, South China University of Technology, Guangzhou 510641, China
    5. NR Electric Co., Ltd., Nanjing 211102, China
    6. State Grid Jiangsu Electric Power Co., Ltd. Research Institute, Nanjing 211103, China

Received date: 2023-05-12

  Revised date: 2023-06-29

  Accepted date: 2023-08-09

  Online published: 2023-08-22

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Abstract

Modular multilevel matrix converter (M3C) is the core device of the fractional frequency transmission system. Due to the lack of direct current link, the electrical quantities of different frequencies are directly coupled inside the M3C, resulting in a complex harmonic condition, which makes it difficult to balance the capacitor voltage of the sub-module and affects the stable operation of the M3C. In this paper, a closed-loop control strategy based on quasi-proportional resonance (PR) controller is proposed to suppress the internal circulation of the M3C. First, the ripple voltage of the sub-module capacitor in steady state is studied. The mechanism of harmonic current generated by the coupling of sub-module ripple voltage and switching function is analyzed in detail. The analytical formula of harmonic circulating current is derived, and the necessity of suppressing the circulating current is pointed out. Then, a parallel quasi-PR circulation suppressor is designed for the harmonic circulation of four frequency components, which reduces the distortion of the bridge arm current while suppressing the circulating current, ensures the capacitor voltage balance between the bridge arms with a good dynamic performance. Finally, a simulation model is built in MATLAB / Simulink and the effectiveness of the control strategy is validated by simulation.

Key words： modular multilevel matrix converter (M3C); fractional frequency transmission system; capacitors ripple voltage; quasi-proportional resonance (PR) control; circulating current suppression

Cite this article

JIANG Yafeng , LI Yibo , WU Qiuwei , LIU Shenquan , WU Xiaodan , ZHOU Qian . Circulating Current Suppression Strategy of Modular Multilevel Matrix Converter Based on Quasi-Proportional Resonant Control[J]. Journal of Shanghai Jiaotong University, 2025 , 59(2) : 242 -251 . DOI: 10.16183/j.cnki.jsjtu.2023.193

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