An Impedance Protection Scheme for Feeders of Active Distribution Networks

Distribution networks (DNs) gradually become more active and flexible with the massive integration of renewable resources. The conventional protection methods are unsuitable for the promising active DNs. This paper proposes a protection scheme on the basis of measured impedance, which includes an im...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2014-08, Vol.29 (4), p.1591-1602
Main Authors: Wentao Huang, Tai Nengling, Xiaodong Zheng, Chunju Fan, Xia Yang, Kirby, Brian J.
Format: Article
Language:English
Subjects:
Active distribution networks
Applied sciences
Automation
Backups
Connection and protection apparatus
Current measurement
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrical resistance measurement
Exact sciences and technology
Exchanging
fault resistance
Faults
Feeders
Impedance
impedance differential protection
Impedance measurement
inverse-time low-impedance protection
microgrids
Miscellaneous
Networks
Power networks and lines
protection coordination
Relays
Renewable resources
Resistance
Time measurement
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Summary:Distribution networks (DNs) gradually become more active and flexible with the massive integration of renewable resources. The conventional protection methods are unsuitable for the promising active DNs. This paper proposes a protection scheme on the basis of measured impedance, which includes an impedance differential method and an inverse-time low-impedance method. The former approach identifies fault instant and provides time reference for the exchanged data. As primary protection, it is able to clear different types of faults as soon as possible. The latter method operates in an automatic coordination way with inverse-time characteristic. It can be used as backup protection or provide protection for single-end lines alone. Both of the methods are independent of operation modes and are able to clear faults with high sensitivity. The efficiency of the protection scheme is validated by PSCAD/EMTDC.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2014.2322866