MMC-MTDC系统直流单极对地短路故障保护策略

doi:10.19595/j.cnki.1000-6753.tces.L70428

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Abstract DC fault protection is a key issue of modular multilevel converter (MMC) based multi-terminal high voltage direct current (MTDC) transmission systems. Most of the existing literatures focus on the pole-to-pole DC short circuit fault. But the pole-to-ground fault also threatens the system security in some conditions. The fault characteristics of the half-bridge MMC-MTDC system is analyzed, adopting with AC and DC grounding modes, respectively. The grounding resistance is also discussed in this paper. Then, based on the capability of the fault current clearance of the full-bridge MMC, this paper proposed a pole-to-ground DC fault protection strategy to restore power transmission quickly. This method can avoid cutting off the AC and DC systems. The theory analysis and the proposed strategy are demonstrated by the PSCAD/EMTDC simulation.

Key words： Modular multilevel converter (MMC) multi-terminal high voltage direct current (MTDC) pole-to-ground DC fault protection strategy

Received: 19 August 2016 Published: 14 September 2017

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TM721

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	Luo Yongjie
	Xu Luona
	Xiong Xiaofu
	Li Yaohua

Cite this article:

Luo Yongjie,Xu Luona,Xiong Xiaofu等. Pole-to-Ground DC Fault Protection of MMC-MTDC Systems[J]. Transactions of China Electrotechnical Society, 2017, 32(增刊1): 98-106.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L70428 OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I增刊1/98

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