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

doi:10.16183/j.cnki.jsjtu.2023.193

Abstract

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

CLC Number:

TM461
TM464

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 Jiao Tong University, 2025, 59(2): 242-251.

Figures/Tables 13

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xy	θ₁	θ₂
au, bw, cv	2φ_s-α_l	α_s+φ_s-φ_l
av, bu, cw	2φ_s-α_l+2π/3	α_s+φ_s-φ_l+2π/3
aw, bv, cu	2φ_s-α_l-2π/3	α_s+φ_s-φ_l-2π/3

环流频率	电容纹波电压中耦合频率成分
2ω_s-ω_l	3ω_s-ω_l、ω_s-ω_l、2ω_s、2ω_s-2ω_l
2ω_s+ω_l	3ω_s+ω_l、ω_s+ω_l、2ω_s、2ω_s+2ω_l
ω_s-2ω_l	2ω_s-2ω_l、ω_s-ω_l、ω_s-3ω_l、2ω_l
ω_s+2ω_l	2ω_s+2ω_l、2ω_l、ω_s+ω_l、ω_s+3ω_l

参数	数值
M³C额定容量/MW	11
C/mF	12
额定电容电压/V	800
桥臂模块数/个	29
桥臂电感/mH	30
工频侧频率/Hz	50
分频侧频率/Hz	20
工频侧额定线电压/kV	12
分频侧额定线电压/kV	12