双极MMC-HVDC系统直流故障特性研究

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Abstract DC fault is one of the main fault types in modular multilevel converter based HVDC (MMC-HVDC). The current research has mainly focused on pseudo bipolar system, while the research of DC fault in bipolar system is still in the initial stage. Hence, this paper introduces the topology and working principle of MMC in bipolar system. For the bipolar and pseudo bipolar systems, the corresponding equivalent circuits of MMC-HVDC system during DC fault are built respectively according to electrical parameters of AC/DC system, the discharging mechanism of sub-module capacitance and inductor on bridge arms. The effects of fault current on bridge arm valve group in bipolar and pseudo bipolar systems are compared, and the relationship between three electrical parameters and fault current is described. Finally, a 51-level bipolar MMC-HVDC model is set up in RT-LAB. The simulation results validate the method of DC fault characteristics.

Key words： HVDC transmission modular multilevel converter (MMC) DC faults fault analysis

Received: 01 December 2016 Published: 26 May 2017

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TM721.1

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	Chen Jikai
	Sun Chuan
	Li Guoqing
	Li Yang
	Li Jiang

Cite this article:

Chen Jikai,Sun Chuan,Li Guoqing等. Study on Characteristics of DC Fault in Bipolar MMC-HVDC System[J]. Transactions of China Electrotechnical Society, 2017, 32(10): 53-60.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I10/53

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