Current based Distance Protection in Closed-Ring Grids with Distributed Generation
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Paper number
1141
Working Group Number
Conference name
CIRED 2019
Conference date
3-6 June 2019
Conference location
Madrid, Spain
Peer-reviewed
Yes
Short title
Convener
Authors
Biller, Martin, Friedrich-Alexander University Erlangen-Nuremberg (FAU), Germany
Jaeger, Johann, Friedrich-Alexander University Erlangen-Nuremberg (FAU), Germany
Jaeger, Johann, Friedrich-Alexander University Erlangen-Nuremberg (FAU), Germany
Abstract
Conventional methods of distance protection relays measure an impedance. Based on voltages and currents, the relay determines the distance between relay and fault location and enables selective fault clearing. Closed-ring structures increase the grid capacity for connecting distributed energy resources as inter infeeds. However, closed-ring structures and inter infeeds can cause malfunctions of conventional distance protection and disturb the proper operation of non-directional short-circuit current indicators particularly. This paper proposes a voltage-less distance protection method which complies with closed loop structures and inter infeeds properly in case of unbalanced faults. The proposed approach is based on current comparison and negative-sequence system quantities. Thus, it remains unaffected from inter infeeds and fault resistances. The approach serves as a supplement to conventional distance protection methods which are applied for symmetrical faults and if the closed-ring structure is dissolved. Finally, the paper presents a protection grading strategy that significantly reduces the average fault clearing time.
Table of content
Keywords
Publisher
AIM
Date
2019-06-03
Published in
Permanent link to this record
https://cired-repository.org/handle/20.500.12455/316
http://dx.doi.org/10.34890/544
http://dx.doi.org/10.34890/544
ISSN
2032-9644
ISBN
978-2-9602415-0-1