a novel protection method for single line-to-ground faults in ungrounded low-inertia microgrids

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ID: 149494
2016
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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).
Reference Key
jing2016energiesa Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Liuming Jing;Dae-Hee Son;Sang-Hee Kang;Soon-Ryul Nam
Journal acs combinatorial science
Year 2016
DOI
10.3390/en9060459
URL
http://www.mdpi.com/1996-1073/9/6/459
Keywords
distributed energy resources ungrounded low-inertia microgridtechnology

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