Volume 8 Number 2 (Apr. 2016)
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IJCEE 2016 Vol.8(2): 84-103 ISSN: 1793-8163
DOI: 10.17706/IJCEE.2016.8.2.84-103

Available Fault Protection Methods of Ungrounded AC Microgrids Evaluated by Transient Simulation Results

Keng-Yu Lien, Duong Minh Bui, Yung-Ruei Chang, Yih-Der Lee, Jheng-Lun Jiang, Ching-Chih Lin
Abstract—This paper evaluates fault protection methods of ungrounded low-voltage (LV) AC microgrids (MGs) based on transient simulation results of a typical ungrounded LVAC microgrid. By considering operation characteristics of ungrounded MGs and a literature review on existing MG fault protection solutions in recent years, possible fault protection methods are proposed for an ungrounded AC MG. Transient simulation results of an ungrounded AC MG are obtained by line-to-line (LL) and line-to-ground (LG) faults, and operation transition tests of the microgrid between autonomous and grid-connected operation modes. Based on the simulation results, advantages and disadvantages of each ungrounded microgrid protection solution are highlighted. In order to get the optimal fault protection, combinations among some or all of possible fault protection solutions of an ungrounded LVAC microgrid are found out. As a result, main contributions of the paper contain: (i) proposing and analysing available fault protection solutions of ungrounded LVAC MGs, (ii) doing the transient simulations of a typical ungrounded microgrid under different disturbance cases, and (iii) suggesting the necessary combinations among proposed fault protection solutions of ungrounded MGs.

Index Terms—Fault analysis and protection, microgrid transient simulations, microgrid operation, and ungrounded microgrids.

Keng-Yu Lien is with the Department of Avionics, China University of Science and Technology, Hsinchu, Taiwan.
Duong Minh Bui and Ching-Chih Lin are with the Department of Electrical Engineering, Chung Yuan Christian University, Chungli, Taiwan.
Yung-Ruei Chang, Yih-Der Lee, and Jheng-Lun Jiang are with the Institute of Nuclear Energy Research, Atomic Energy Council, Taoyuan, Taiwan.

Cite:Keng-Yu Lien, Duong Minh Bui, Yung-Ruei Chang, Yih-Der Lee, Jheng-Lun Jiang, Ching-Chih Lin, "Available Fault Protection Methods of Ungrounded AC Microgrids Evaluated by Transient Simulation Results," International Journal of Computer and Electrical Engineering vol. 8, no. 2, pp. 84-103, 2016.

General Information

ISSN: 1793-8163
Frequency: Semiyearly
Editor-in-Chief: Prof. Yucong Duan
Abstracting/ Indexing: EI (INSPEC, IET), Ulrich's Periodicals Directory, Google Scholar, EBSCO, Engineering & Technology Digital Library, ProQuest, and Electronic Journals Library
E-mail: ijcee@iap.org

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