A Novel Protection Method for Single Line-to-Ground Faults in Ungrounded Low-Inertia Microgrids

Liuming Jing, Dae-Hee Son, Sang-Hee Kang and Soon-Ryul Nam
Additional contact information
Liuming Jing: Department of Electrical Engineering, Myongji University, Yongin 449-728, Korea
Dae-Hee Son: Department of Electrical Engineering, Myongji University, Yongin 449-728, Korea
Sang-Hee Kang: Department of Electrical Engineering, Myongji University, Yongin 449-728, Korea
Soon-Ryul Nam: Department of Electrical Engineering, Myongji University, Yongin 449-728, Korea

Energies, 2016, vol. 9, issue 6, 1-16

Abstract: This paper proposes a novel protection method for single line-to-ground (SLG) faults in ungrounded low-inertia microgrids. The proposed method includes microgrid interface protection and unit protection. The microgrid interface protection is based on the difference between the zero-sequence voltage angle and the zero-sequence current angle at the microgrid interconnection transformer for fast selection of the faulty feeder. The microgrid unit protection is based on a comparison of the three zero-sequence current phase directions at each junction point of load or distributed energy resources. Methods are also included to locate the minimum fault section. The fault section location technology operates according to the coordination of microgrid unit protection. The proposed method responds to SLG faults that may occur in both the grid and the microgrid. Simulations of an ungrounded low-inertia microgrid with a relay model were carried out using Power System Computer Aided Design (PSCAD)/Electromagnetic Transients including DC (EMTDC).

Keywords: distributed energy resources; microgrid protection; single line-to-ground (SLG) fault; ungrounded low-inertia microgrid (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2016
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

Downloads: (external link)
https://www.mdpi.com/1996-1073/9/6/459/pdf (application/pdf)
https://www.mdpi.com/1996-1073/9/6/459/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:9:y:2016:i:6:p:459-:d:72127

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().