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Island Operation of the Induction Generator - Fault Currents and Protection

  • Francesco Sulla
Publiceringsår: 2007
Språk: Engelska
Publikation/Tidskrift/Serie: TEIE
Volym: 7220
Dokumenttyp: Rapport
Förlag: Department of Industrial Electrical Engineering and Automation, Lund Institute of Technology


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.


  • Other Electrical Engineering, Electronic Engineering, Information Engineering


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

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