A Transient Current Waveform Feature Based Novel High-speed Differential Protection

被引：0
|
作者：
Lyu Z. [1 ]
Wang Z. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Changping District, Beijing
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2020年 / 40卷 / 05期
基金：
国家重点研发计划; 中国国家自然科学基金;
关键词：
Differential current; Fault transient; Least square fitting; Relay protection; Waveform feature;
D O I：
10.13334/j.0258-8013.pcsee.190520
中图分类号：
学科分类号：
摘要：
With the development of large-scale AC/DC hybrid systems, the problems caused by system faults become more and more serious. So higher requirements are placed on the performance of the relay protection. The line fault transients contain a wealth of fault information. Through the research on the transient differential current of the fault component, it is found that the fault phase appears as a power frequency under internal fault. The non-fault phase of internal fault and each phase of the external fault appear as a high-frequency, and there is a theoretical minimum frequency. Therefore, a new pilot protection principle based on transient current waveform was proposed. The least squares fitting method is used to extract the frequency information and the corresponding protection criterion was constructed. Through simulation verification, the proposed protection can reliably and sensitively identify various internal and external faults, effectively improve the protection action speed, and has strong resistance to transition resistance and high frequency noise interference. The proposed protection has low requirements on sampling frequency, which has certain practical value. © 2020 Chin. Soc. for Elec. Eng.
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收藏
页码：1534 / 1544
页数：10
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