Current based Distance Protection in Closed-Ring Grids with Distributed Generation

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CIRED 2019 - 1141.pdf (281.93 KB)

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

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.

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Keywords

Publisher

AIM

Date

2019-06-03

Published in

CIRED 2019 Conference

Permanent link to this record

https://cired-repository.org/handle/20.500.12455/316
http://dx.doi.org/10.34890/544

ISSN

2032-9644

ISBN

978-2-9602415-0-1