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Island Operation of the Induction Generator - Fault Currents and Protection

Författare:
Publiceringsår: 2007
Språk: Engelska
Publikation/Tidskrift/Serie: TEIE
Dokumenttyp: Rapport
Förlag: Dept. of Industrial Electrical Engineering and Automation, Lund Institute of Technology

Sammanfattning

During the last years, costs for power interruptions to customers have increased and
from 2011 a new legislation will not allow power interruptions longer than 24 hours.
Electric power utilities are facing important costs to decrease the likelihood of power
interruption in the future.
Island operation of distribution systems is not commonly employed in Sweden, also
for safety reasons. The penetration of distributed generation into distribution
networks is expected to grow in the next years; induction generators will represent a
large amount of distributed generation and may dominate in local areas.
In this scenario, island operation of distribution networks with distributed generation
can be regarded as a means to reduce power interruptions to final customers and
improve power supply security. There are still many barriers to be removed before
island operation of distribution networks can be accepted. Beside safety reasons, the
quality of the delivered power may be a concern.
With induction generators operating in an island system, voltage and frequency
control issues must be addressed; moreover safe operation requires that the protection
system be adequately adapted so that any fault in the distribution system operating in
island is promptly detected and cleared.
In this report, the behaviour of the induction generator in island operation under
faulted conditions is investigated through simulations and some protection issues are
addressed. But first a brief overview on earthing practices of distribution networks in
Sweden is performed.

Disputation

Nyckelord

  • Technology and Engineering

Övriga

Published
7220
  • CODEN:LUTEDX/(TEIE-7220)/1-069/(2007)

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