含边界元件的MMC-MTDC直流侧单端量故障辨识方法

doi:10.19595/j.cnki.1000-6753.tces.191704

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Abstract DC-side fault identification is the major scientific issue that needs to be solved urgently for multi-terminal DC transmission (MTDC) system based on modular multilevel converter(MMC). This paper proposed a fault identification method based on the single-ended transient energy by analyzing the boundary characteristic and inter-pole coupling characteristic of the DC line. The fault line selection criterion was constructed by the transient characteristic of the internal fault and external fault and the directional element. And the bus fault identification criterion was achieved by the directional element of the bus-connected lines and the transient characteristic of AC-side fault. Then, the fault pole discrimination criterion was designed by the low-frequency current difference between two poles. The proposed method could quickly identify the DC-side fault without communication, which could satisfy the speed and selectivity requirement of the MMC-MTDC system. At last, the Zhangbei four-port flexible DC system is built in PSCAD and the accuracy of the proposed method is verified by simulation results of different fault type, fault location and transition resistance, as well as proving that the method has certain ability resisting transition resistance.

Key words： Fault identification modular multilevel converter multi-terminal direct current transmission transient energy directional element

Received: 06 December 2019

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TM721

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	Fu Hua
	Chen Haoxuan
	Li Xiuju
	Chen Runjing

Cite this article:

Fu Hua,Chen Haoxuan,Li Xiuju等. MMC-MTDC DC Side Single-Ended Quantity Fault Identification Method with Boundary Elements[J]. Transactions of China Electrotechnical Society, 2021, 36(1): 215-226.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191704 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I1/215

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