Implementation of Wind- and Hydropower in Electrical Grids in Dalarna

Abstract: These days more renewable energy sources are beingintegrated into the power system, while nuclear power and otherconventional energy sources are being demounted. This comeswith some obstacles, e.g. the renewable energy sources do nothave the same ability to produce reactive power as conventionalenergy sources do. The purpose of this study is to investigate howthe voltage in a power grid would behave with only renewableenergy sources as generators. A fictive power grid was madeto represent a real power grid based in the region of Dalarna,Sweden. Maintain a stable voltage by only using wind andhydropower was the goal of the study, but also to have an self-sufficient grid that does not have to import power from nearbyregions. By using numerical analysis in Matlab with real data,the grid was simulated. The result was that the fictive grid wasnot able to be entirely self-sufficient as it had to import powerfrom nearby regions. In the constructed grid the voltage neverdeviated more than 1 % from the nominal voltage. In conclusion,the study fulfilled all the goals other than making it independent.