基于电流有效值实时算法的限流器快速故障辨识方法

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摘要故障限流器（FCL）能够有效限制电网短路电流,成为提高电网运行可靠性的重要方法之一。本文在分析电网短路电流特征和一种含有分裂电抗器的经济型限流器限流性能的基础上,根据电抗器的瞬时电流-电压关系和有效值概念,建立线路电流有效值实时算法。基于10kV/300A电网实例,研究故障发生后电流、电压变化特征,采用电流瞬时值、电流变化率、常规有效值算法、有效值实时算法等进行快速故障辨识时间的研究和对比分析。最后设计短路故障限流实验,对所提算法进行验证。研究结果表明,有效值实时算法在各种故障相位下均能可靠实现快速故障辨识,实现限流器快速投入电网,提高了经济型限流器的限流性能和运行可靠性。

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	张志丰
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关键词 ：有效值, 实时算法, 快速故障辨识方法, 限流器（FCL）, 短路故障

Abstract：Fault current limiter (FCL) can effectively limit the short-circuit current of power system, which is one of the important methods to improve the reliability of power system. In this paper, short-circuit current characteristics and current limiting performance of an economical FCL with a split reactor are studied. According to instantaneous current-voltage relationship of a reactor and the concept of the current effective value, a kind of real-time algorithm of the current effective value is established. Based on a 10kV/300A power system example, the characteristics of current’s and voltage’s changes after a short-circuit fault are studied. And the fast fault identification methods are studied and analyzed contrastively by using different signals, such as current instantaneous value, rate of current’s change, conventional RMS (root mean square) algorithm, real-time algorithm. Finally, a short-circuit fault current limiting experiment is designed and the algorithm has been verified. The research results show that the real-time algorithm of current effective value can reliably realize fast fault identification at every fault phase-angle, and the limiting reactor of the FCL can be put into the power line to limit short-circuit current in time, which improves the current limiting performance and operational reliability of the economical FCL.

Key words： root mean square (RMS) real-time algorithm fast fault identification method fault current limiter (FCL) short-circuit fault

收稿日期: 2022-01-11

基金资助:国网河南省电力公司科技项目（52170220009K）; 国家自然科学基金创新研究群体项目（51721005）

作者简介: 张志丰（1966—）,男,甘肃省庆阳市人,博士,研究员,主要从事电力系统限流保护技术和新型电网技术方面的研究工作。

引用本文:

张志丰, 张凯, 董轩, 池腾, 谢芮芮. 基于电流有效值实时算法的限流器快速故障辨识方法[J]. 电气技术, 2022, 23(7): 81-88. ZHANG Zhifeng, ZHANG Kai, DONG Xuan, CHI Teng, XIE Ruirui. Fast fault identification method based on real-time algorithm of current root mean square value for fault current limiter. Electrical Engineering, 2022, 23(7): 81-88.

链接本文:

http://dqjs.cesmedia.cn/CN/Y2022/V23/I7/81

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