微电网
断层(地质)
故障检测与隔离
工程类
电阻抗
电子工程
高阻抗
电力系统保护
控制理论(社会学)
波形
分布式发电
电力系统
计算机科学
功率(物理)
电压
电气工程
控制(管理)
地震学
地质学
物理
人工智能
量子力学
执行机构
可再生能源
作者
Meysam Yadegar,Seyed Fariborz Zarei,Nader Meskin,Frede Blaabjerg
标识
DOI:10.1109/tpwrd.2023.3327307
摘要
This paper proposes a high-impedance fault (HIF) detection and protection scheme for DC microgrids. HIFs occur when a (live) conductor makes contact with a surface which restricts the flow of fault current to a level that cannot be reliably sensed/detected by the conventional relays. HIF detection is an important concern for the electric power grid since it may cause public safety hazards. In this paper, a distributed HIF detection and localization scheme is proposed which considers the inherent HIF arc-characteristics of very low fault current amplitude, nonlinearity, buildup, shoulder, intermittence, and high-frequency content. The proposed scheme effectively identifies the faulty section, and provides forward and reverse fault discrimination capability. To verify the effectiveness of the proposed method, different sets of test cases and experiments are analyzed and presented. In the test cases, the forward/reverse faults and the noise-induced signals are considered and evaluated. Furthermore, detection and localization of both ideal and non-ideal HIFs are evaluated on the test system. The non-ideal HIFs are modeled based on the experimental test waveforms of HIFs. Also, the functionality of the proposed scheme is verified under normal condition with operational changes in a DC microgrid.
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