基于故障全电流相关性检验的柔性直流配电线路纵联保护

doi:10.19595/j.cnki.1000-6753.tces.190185

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Abstract Because the converter is fast blocking (2~5ms) when DC line fault occurs in flexible DC distribution system, limited time and data with time-varying are available for fault area estimation. Therefore, quick fault detection and isolation of faulty section are desired in DC distribution system, which can accelerate the process of clear fault and decrease the system restoration time. This paper proposed a new pilot protection for flexible-DC distribution line based on correlation test of DC current. Based on the fault current characteristics, the t-test was adopted to calculate the correlation of transient, and then the criterion was constructed. The method uniformly describes the magnitude, direction, polarity and abrupt characteristics of total current signals on both sides, avoiding the influence of transition resistance, distributed capacitance and noise on the protection of transient signals. Hardware test and simulation results show that the proposed protection can identify internal faults with good reliability and high sensitivity, which is feasible for industry application.

Key words： Flexible DC distribution line fault current characteristics correlation test t-test algorithm fault identification

Received: 25 February 2019 Published: 24 April 2020

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TM771

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	Articles by authors
	Wang Congbo
	Jia Ke
	Zhao Qijuan
	Feng Tao
	Bi Tianshu

Cite this article:

Wang Congbo,Jia Ke,Zhao Qijuan等. Pilot Protection for Flexible-DC Distribution Line Based on Correlation Test of DC Current[J]. Transactions of China Electrotechnical Society, 2020, 35(8): 1764-1775.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190185 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I8/1764

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