Research on circulating current suppression strategy of modular multilevel converter

Qili Shu; Guochu Chen

doi:10.1117/12.2623874

6 February 2022 Research on circulating current suppression strategy of modular multilevel converter

Qili Shu, Guochu Chen

Proceedings Volume 12081, Sixth International Conference on Electromechanical Control Technology and Transportation (ICECTT 2021); 1208106 (2022) https://doi.org/10.1117/12.2623874
Event: Sixth International Conference on Electromechanical Control Technology and Transportation (ICECTT 2021), 2021, Chongqing, China

Abstract

Modular multilevel converter MMC has been extensively studied in recent years because of its unique adaptability to meet high-voltage and large-capacity scenarios. However, the fluctuation of the capacitor voltage of the MMC sub-module causes circulating currents between the three-phase units, which affects the working characteristics of the converter, increases system losses, and causes excessive economic costs. After comparing various circulating current suppression methods, an improved traditional PI control circulating current suppression strategy is proposed. The fuzzy PI control strategy controls the voltage and the inner loop quasi-proportional control strategy controls the current to achieve the circulating current suppression effect.

Citation Download Citation

Qili Shu and Guochu Chen "Research on circulating current suppression strategy of modular multilevel converter", Proc. SPIE 12081, Sixth International Conference on Electromechanical Control Technology and Transportation (ICECTT 2021), 1208106 (6 February 2022); https://doi.org/10.1117/12.2623874

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