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Protection of microgrids using differential relays

Dewadasa, Manjula, Ghosh, Arindam, & Ledwich, Gerard (2011) Protection of microgrids using differential relays. In Proceedings from AUPEC 2011 : Integrating Renewables into the Grid, IEEE, Queensland University of Technology , Brisbane, QLD.

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Abstract

A microgrid provides economical and reliable power to customers by integrating distributed resources more effectively. Islanded operation enables a continuous power supply for loads during a major grid disturbance. Reliability of a microgrid can be further increased by forming a mesh configuration. However, the protection of mesh microgrids is a challenging task. In this paper, protection schemes are discussed using current differential protection of a microgrid. The protection challenges associated with bi-directional power flow, meshed configuration, changing fault current level due to intermittent nature of DGs and reduced fault current level in an islanded mode are considered in proposing the protection solutions. Relay setting criterion and current transformer (CT) selection guidelines are also discussed. The results are verified using MATLAB calculations and PSCAD simulations.

Impact and interest:

4 citations in Scopus
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ID Code: 47434
Item Type: Conference Paper
Keywords: Microgrid Protection, Fault Isolation, Differential Relays, Current Transformer
ISBN: 9781921897078
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Electrical and Electronic Engineering not elsewhere classified (090699)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2011 IEEE
Copyright Statement: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Deposited On: 01 Dec 2011 21:45
Last Modified: 03 Dec 2011 04:37

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