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Energies 2016, 9(6), 459; doi:10.3390/en9060459

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

Department of Electrical Engineering, Myongji University, Yongin 449-728, Korea
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Academic Editor: Paras Mandal
Received: 16 March 2016 / Revised: 8 June 2016 / Accepted: 8 June 2016 / Published: 16 June 2016
(This article belongs to the Special Issue Smart Microgrids: Developing the Intelligent Power Grid of Tomorrow)

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). View Full-Text
Keywords: distributed energy resources; microgrid protection; single line-to-ground (SLG) fault; ungrounded low-inertia microgrid distributed energy resources; microgrid protection; single line-to-ground (SLG) fault; ungrounded low-inertia microgrid
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jing, L.; Son, D.-H.; Kang, S.-H.; Nam, S.-R. A Novel Protection Method for Single Line-to-Ground Faults in Ungrounded Low-Inertia Microgrids. Energies 2016, 9, 459.

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