Article | Proceedings of the 10<sup>th</sup> International Modelica Conference; March 10-12; 2014; Lund; Sweden | Modelling the system dynamics of islanding asynchronous generators
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Title:
Modelling the system dynamics of islanding asynchronous generators
Author:
Håkon Molland Edvardsen: Oslo, Norway Dietmar Winkler: Telemark University College, Norway
DOI:
10.3384/ecp14096969
Download:
Full text (pdf)
Year:
2014
Conference:
Proceedings of the 10th International Modelica Conference; March 10-12; 2014; Lund; Sweden
Issue:
096
Article no.:
101
Pages:
969-978
No. of pages:
10
Publication type:
Abstract and Fulltext
Published:
2014-03-10
ISBN:
978-91-7519-380-9
Series:
Linköping Electronic Conference Proceedings
ISSN (print):
1650-3686
ISSN (online):
1650-3740
Publisher:
Linköping University Electronic Press; Linköpings universitet


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Asynchronous generators are often used for small hydro power stations with an installed power capacity of under 1MW. The reason for this is their robustness and low cost. In order do be able to produce active electrical power with an asynchronous generator once needs to provide enough excitation by means of reactive power provided by either the electrical grid or additional capacitors.

But in asynchronous generators we can also find the phenomenon of self-excitation which allows the asynchronous generator to operate as a standalone unit. Investigation of the self-excitation process shows that significant over-voltages can occur if a generator with sufficient capacitors is suddenly disconnected from the utility grid. The precondition for a successive voltage build-up is that the generator is left with enough capacitive power and a low load after the disconnection.

The L√łnnestad radial in Seljord; Norway; is a distribution radial with both asynchronous and synchronous generators connected. In order to investigate the system dynamics in the radial after it is disconnected from the rest of the 22kV distribution grid; the radial was modelled and simulated using Modelica as modelling language.

Keywords: Modelica; asynchronous generators; self-excitation; islanding; electric power library

Proceedings of the 10th International Modelica Conference; March 10-12; 2014; Lund; Sweden

Author:
Håkon Molland Edvardsen, Dietmar Winkler
Title:
Modelling the system dynamics of islanding asynchronous generators
DOI:
http://dx.doi.org/10.3384/ecp14096969
References:

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[12] H√•kon Molland Edvardsen. ‚ÄúSystem dynamics of asynchronous generators at islanded grid operation‚ÄĚ. MA thesis. Telemark University College, 2013. DOI: 2282/2125. URL: https://teora.hit.no/handle/2282/2125.

Proceedings of the 10th International Modelica Conference; March 10-12; 2014; Lund; Sweden

Author:
Håkon Molland Edvardsen, Dietmar Winkler
Title:
Modelling the system dynamics of islanding asynchronous generators
DOI:
http://dx.doi.org/10.3384/ecp14096969
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