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Open AccessArticle

Study on Operational Characteristics of Protection Relay with Fault Current Limiters in an LVDC System

1
Department of Electrical Engineering, Soongsil University, 369, Sangdo-ro, Dongjak-gu, Seoul 06978, Korea
2
Department of Electrical Engineering, Seoil University, 28, Yongmasan-ro 90-gil, Jungnang-gu, Seoul 02192, Korea
3
Department of Electrical Engineering, Chonnam National University, 77, Yongbong-ro, Buk-gu, Gwangju 61186, Korea
4
Korea Electric Power Research Institute (KEPRI), Korea Electric Power Company (KEPCO), 105, Munji-ro, Yuseong-gu, Daejeon 34056, Korea
*
Authors to whom correspondence should be addressed.
Electronics 2020, 9(2), 322; https://doi.org/10.3390/electronics9020322
Received: 20 January 2020 / Revised: 5 February 2020 / Accepted: 7 February 2020 / Published: 12 February 2020
(This article belongs to the Special Issue Emerging Technologies in Power Systems)
As the application of low-voltage-direct-current system increases, fault analysis in the low-voltage-direct-current system has essential because the fault response has different from the conventional AC distribution system. Especially, the fault current by the discharge current of the capacitor in the low-voltage-direct-current distribution system has very large compared with the conventional AC distribution system. Therefore, this paper proposed the application of the superconducting fault current limiter for limiting the fault current on the low-voltage-direct-current system. As one of the protected methods against fault current, the superconducting fault current limiter which could quickly limit the fault current has been noticed as an attractive method. However, the protection relay may malfunction such as over current relay, selective protection relay due to limiting fault current by applying superconducting fault current limiter. Therefore, in this paper proposed a solution to malfunction problem of the protection relay using the voltage components of the high temperature superconductivity. This paper verified the effect of the proposed method through test modelling and PSCAD/EMTDC .
Keywords: low voltage direct current (LVDC); micro-grid; superconducting fault current limiter (SFCL); protection relay; over current relay; selective protection relay low voltage direct current (LVDC); micro-grid; superconducting fault current limiter (SFCL); protection relay; over current relay; selective protection relay
MDPI and ACS Style

Hyeong-Jin, L.; Jin-Seok, K.; Jae-Chul, K.; Sang-Yun, Y.; Sung-Min, C. Study on Operational Characteristics of Protection Relay with Fault Current Limiters in an LVDC System. Electronics 2020, 9, 322.

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