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Analys av mellanspänningsnätet i centrala delar av Västerås stad
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2015 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
Analysis of the Primary Power Distribution System Located in the City Centre of Västerås (English)
Abstract [en]

The dependency of continuous electricity supply is high in the Swedish society today, at the same time no one is willing to pay for a too costly or over dimensioned power distribution system. The owners of the distribution systems are the ones responsible for this balance act of maintaining a high quality of electricity delivery to customers at a reasonable cost.

In this master thesis a limited part of the primary distribution system (10 kV), owned by Mälarenergi Elnät AB and located in the city centre of Västerås, was chosen for a deeper analysis of its reliability. Its ability to handle outages of system components (N-1 and N-2 contingency analysis) was investigated to find out potential weak spots and parts of the grid that showed signs of being overdimensioned.

The results of the performed simulations showed that in 74 % of the studied N-1 contingencies cases, consisting of outages of a bus bar in a distribution substation, the system could handle this without causing outages in other parts of the grid. For the N-2 contingencies 61 % passed the test. It was also found that one of the two included high voltage substations could alone supply the investigated part of the grid. Some cables and transformers were found to be more or less unnecessary, whereas other components proved to be overloaded in several situations.

Place, publisher, year, edition, pages
2015. , 67 p.
UPTEC ES, ISSN 1650-8300 ; 15023
Keyword [sv]
Distributionsnät, Lokalnät, Lastflödesberäkningar, Effektfördelningsberäkningar, N-1
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Energy Systems
URN: urn:nbn:se:uu:diva-255640OAI: diva2:822944
External cooperation
Mälarenergi Elnät AB
Educational program
Master Programme in Energy Systems Engineering
Available from: 2015-06-25 Created: 2015-06-17 Last updated: 2015-06-25Bibliographically approved

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