OPTIMIZATION DESIGN AND DC FAULT TRAVERSAL STRATEGY OF SUBMODULE HYBRID MMC DC TRANSMISSION SYSTEM

Ma Wenzhong; Wang Hao; Wang Yusheng; Jiao Lixin; Jin Qiongting; Zhang Jingshun

doi:10.19912/j.0254-0096.tynxb.2023-0669

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Acta Energiae Solaris Sinica ›› 2024, Vol. 45 ›› Issue (9) : 80-90. DOI: 10.19912/j.0254-0096.tynxb.2023-0669

OPTIMIZATION DESIGN AND DC FAULT TRAVERSAL STRATEGY OF SUBMODULE HYBRID MMC DC TRANSMISSION SYSTEM

Ma Wenzhong¹, Wang Hao¹, Wang Yusheng², Jiao Lixin¹, Jin Qiongting¹, Zhang Jingshun¹

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Abstract

Short circuit fault is one of the main issues affecting the safe operation of flexible DC transmission systems. This paper focuses on the pole-to-pole DC fault. Firstly, a hybrid MMC structure based on series double capacitor submodule （SDSM） and half bridge submodule （HBSM） is studied. Compared with traditional half bridge full bridge submodule hybrid MMC, this structure has lower cost and loss. The configuration ratio design requirements of SDSM and HBSM under transient operation of DC side short circuit are analyzed; Secondly, considering the lack of autonomous negative level output capability of SDSM, a fault crossing strategy based on current phase is proposed. The idea of hierarchical control is adopted to construct a phase current state matrix and combine it with its phase difference to ensure that the converter station can operate with reduced voltage during faults and maintain stable system operation; Finally, the above analysis and the feasibility of the proposed fault traversal strategy were verified through simulation in Matlab/Simulink.

Key words

HVDC power transmission / multilevel modular converter / DC side faults / fault ride through / ratio design

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Ma Wenzhong, Wang Hao, Wang Yusheng, Jiao Lixin, Jin Qiongting, Zhang Jingshun. OPTIMIZATION DESIGN AND DC FAULT TRAVERSAL STRATEGY OF SUBMODULE HYBRID MMC DC TRANSMISSION SYSTEM[J]. Acta Energiae Solaris Sinica. 2024, 45(9): 80-90 https://doi.org/10.19912/j.0254-0096.tynxb.2023-0669

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