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Energies 2017, 10(4), 526; doi:10.3390/en10040526

Unsynchronized Phasor-Based Protection Method for Single Line-to-Ground Faults in an Ungrounded Offshore Wind Farm with Fully-Rated Converters-Based Wind Turbines

Department of Electrical Engineering, Myongji University, Yongin 449-728, Korea
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Author to whom correspondence should be addressed.
Academic Editor: Ying-Yi Hong
Received: 12 December 2016 / Revised: 14 March 2017 / Accepted: 10 April 2017 / Published: 13 April 2017
(This article belongs to the Special Issue Electric Power Systems Research 2017)
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Abstract

This paper proposes a protection method for single line-to-ground (SLG) faults in an ungrounded offshore wind farm with fully-rated converter-based wind turbines. The proposed method uses the unsynchronized current phasors measured by unit protections installed at the connection point of the fully-rated converter (FRC)-based wind turbines (WTs). Each unit protection collects the unsynchronized current phasors from two adjacent nodes and synchronizes them by aligning the positive-sequence current to the same phase angle. The faulted section is identified by comparing the phase angles of the synchronized zero-sequence currents from adjacent nodes. Simulations of an ungrounded offshore wind farm with relay models were carried out using power system computer-aided design (PSCAD)/ electromagnetic transients including direct current (EMTDC). View Full-Text
Keywords: fully-rated converter-based wind turbines; offshore wind farm; single line-to-ground fault; unit protection fully-rated converter-based wind turbines; offshore wind farm; single line-to-ground fault; unit protection
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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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Jing, L.; Son, D.-H.; Kang, S.-H.; Nam, S.-R. Unsynchronized Phasor-Based Protection Method for Single Line-to-Ground Faults in an Ungrounded Offshore Wind Farm with Fully-Rated Converters-Based Wind Turbines. Energies 2017, 10, 526.

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