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Ny stamstation i Yttermalung för anslutning av vindkraft: Nätstudie av olika utföranden i normal- och reservdrift
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2014 (Swedish)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesisAlternative title
New Substation in Yttermalung to Connect Wind Farms : A Power System Analysis in Normal- and Emergency Operating Modes (English)
Abstract [en]

Since 2004, wind power has had the largest installation of new capacity compared to other energy sources in Sweden. Accommodating new wind power may require strengthening or rebuilding of the existing grid in areas where the grid is already loaded to maximum capacity. This master thesis examine the possibility of a new 400/130 kV substation in Yttermalung, Sweden, with a connection to the two neighboring regional grids in Dalarna and Värmland owned by Fortum. This substation would provide a new connection point to the Swedish transmission system as well as an interconnection of the two, currently separated, regional grids. Different expansion scenarios where a substation with and without series compensation or a phase shifting transformer (PST) to control active power flow were studied. A total of 650MW new wind power farms connected in six different locations were also included in the scenarios. Load flow, contingency studies and fault currents were calculated for the scenarios in the software tool Power System Simulator for Engineering. The study shows that the new substation would improve redundancy of the regional grids, decrease loading of many branches and only affect voltage marginally, however increased fault currents can be expected in stations located close to the new substation. It is possible to connect the modelled wind power farms, provided that power output is regulated at sensitive parts of the grid during critical operating conditions. Värmland’s regional grid experiences unwanted power flow through the system but only during uncritical loading conditions. The unwanted power flow can be prevented, most efficiently by connecting a PST to Värmland’s regional grid. This can also be installed later on after the substation has been commissioned, when the amount of wind power connections require it.

Place, publisher, year, edition, pages
2014. , 77 p.
UPTEC ES, ISSN 1650-8300 ; 14007
Keyword [sv]
Elnät, Nätstudie, Systemstudie, termisk belastning, vinkelvridande transformator, tvärreglerad transformator
National Category
Energy Systems
URN: urn:nbn:se:uu:diva-226929OAI: diva2:727824
External cooperation
Educational program
Master Programme in Energy Systems Engineering
Available from: 2014-07-02 Created: 2014-06-23 Last updated: 2014-07-02Bibliographically approved

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