Adaptive Protection Coordination Method Design of Remote Microgrid for Three-Phase Short Circuit Fault

Wookyu Chae, Jung-Hun Lee, Woo-Hyun Kim, Sungwook Hwang, Jun-Oh Kim and Jae-Eon Kim
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Wookyu Chae: Smart Power Distribution Laboratory, Distribution Planning Group, KEPCO Research Institute, Daejeon 34056, Korea
Jung-Hun Lee: Smart Power Distribution Laboratory, Distribution Planning Group, KEPCO Research Institute, Daejeon 34056, Korea
Woo-Hyun Kim: Smart Power Distribution Laboratory, Distribution Planning Group, KEPCO Research Institute, Daejeon 34056, Korea
Sungwook Hwang: Smart Power Distribution Laboratory, Distribution Planning Group, KEPCO Research Institute, Daejeon 34056, Korea
Jun-Oh Kim: Korea Electric Power Corporation, Daegu 41590, Korea
Jae-Eon Kim: School of Electrical Engineering, Chungbuk National University, Cheongju 28644, Korea

Energies, 2021, vol. 14, issue 22, 1-20

Abstract: Generally, the fault current supplied by inverter-based renewable energy sources (IBRES) and electrical storage systems (ESS) is about 1.2 to 2 times their rated current and much lower than synchronous generators because the former acts as a current source and the latter acts as a voltage source. A conventional power system in a small island is composed of only synchronous generators and protected from short circuit faults using an overcurrent relay (OCR). However, in the remote microgrid with IBRES, ESS, and synchronous generators, the fault current varies depending on the configuration of generation sources. Namely, the fixed OCR protection method cannot protect microgrids from short circuit faults. This paper proposes an adaptive protection method to protect the microgrid from faults by actively changing the OCR setting according to the state of the generator source combination. A microgrid with ESS and a synchronous generator is modeled and simulated through PSCAD/EMTDC software to validate the proposed adaptive protection method.

Keywords: remote microgrid; adaptive protection; relay; ESS; renewable energy; short circuit fault (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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