基于直流滤波环节暂态能量比的高压直流线路纵联保护

doi:10.19595/j.cnki.1000-6753.tces.190375

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Abstract Traditional current differential protection for high voltage direct current (HVDC) transmission lines has the disadvantages such as low tripping speed and limited ability to withstand high-impedance faults. Therefore, a novel pilot protection scheme based on the ratio of transient energy within the specific frequency band on both sides of the line boundary is proposed. Based on the impedance-frequency characteristic of the DC filter, the theoretical analysis on the fault-component networks corresponding to internal and external faults on the DC transmission line shows that, under an internal fault, for either terminal of the dc line, the transient energy within a specific frequency band on the line side of the boundary is much greater than that on the valve side of the boundary, and their ratio is large. Nevertheless, for rectifier-terminal (inverter-terminal) external faults, the transient energy on the line side of the rectifier-terminal (inverter-terminal) boundary is much less than that on the valve side of the boundary, and their ratio is small. Thus, it can be utilized to discriminate internal faults from external ones. Simulation results show that the proposed protection scheme with low computational complexity can identify the internal and external faults quickly, and can protect the entire line reliably. Besides, it can identify high-impedance internal faults and is not subject to the distributed capacitor of dc lines.

Key words： High voltage direct current (HVDC) pilot protection line boundary fault component transient energy

Received: 04 April 2019 Published: 12 May 2020

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TM773

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	Articles by authors
	Dai Zhihui
	Liu Ningning
	He Yongxing
	Lu Hao
	Liu Yuan

Cite this article:

Dai Zhihui,Liu Ningning,He Yongxing等. A Pilot Protection for HVDC Transmission Lines Based on the Ratio of DC Filter Link Transient Energy[J]. Transactions of China Electrotechnical Society, 2020, 35(9): 1985-1998.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190375 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I9/1985

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