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Cost estimation of wind farms' internal grids
KTH, School of Electrical Engineering (EES), Electric Power Systems.
2011 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

When establishing new wind farms there are a lot of different stakeholders that have different demands and ambitions.The local grid in a wind farm constitutes of about 10% of the total investment cost and therefore it is of importance that it is optimized both regarding losses and costs. In a wind farm project a system analysis is ordered thatsummarizes information such as cable layout, electric data and losses. A drawback is that this analysis is given in a later part of the project, when most decisions already have been made due to permits. If the analysis shows that there are unnecessarily high losses in the system it can be too late to make changes.The aim of this Master’s thesis project is to develop a method that makes the essential calculations so that an estimation of losses and its costs together with the investment costs can be made at an early stage. The first part of the thesis consisted of developing a program using this method with the requests above to, in the next stage, compare the results the method acquires with a reference system analysis of an existing wind farm. From this comparison conclusions were made whether the method is usable and in which ways it resembles and differs from the more advanced method used in a program today.The results show that the method makes a good estimation of losses. Deviations between the developed method and the reference analysis are due to that different approaches are made when calculating certain losses and also the depth of the calculations. Furthermore there is no description of how precise the calculations in the reference report were made so approximations can be a source of error.The conclusion is that this method can be used to get an early estimation of the losses and the corresponding costs of the local grid.

Place, publisher, year, edition, pages
2011. , 56 p.
EES Examensarbete / Master Thesis, XR-EE-ES 2011:017
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-47831OAI: diva2:456427
Available from: 2011-11-15 Created: 2011-11-14 Last updated: 2013-04-03

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