Impact of Generator Stroke Length on Energy Production for a Direct Drive Wave Energy Converter
2016 (English)In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 9, no 9, 730Article in journal (Refereed) Published
The Lysekil wave energy converter (WEC), developed by the wave energy research group of Uppsala University, has evolved through a variety of mechanical designs since the first prototype was installed in 2006. The hundreds of engineering decisions made throughout the design processes have been based on a combination of theory, know-how from previous experiments, and educated guesses. One key parameter in the design of the WECs linear generator is the stroke length. A long stroke requires a taller WEC with associated economical and mechanical challenges, but a short stroke limits the power production. The 2-m stroke of the current WECs has been an educated guess for the Swedish wave climate, though the consequences of this choice on energy absorption have not been studied. When the WEC technology is considered for international waters, with larger waves and challenges of energy absorption and survivability, the subject of stroke length becomes even more relevant. This paper studies the impact of generator stroke length on energy absorption for three sites off the coasts of Sweden, Chile and Scotland. 2-m, 4-m, and unlimited stroke are considered. Power matrices for the studied WEC prototype are presented for each of the studied stroke lengths. Presented results quantify the losses incurred by a limited stroke. The results indicate that a 2-m stroke length is likely to be a good choice for Sweden, but 4-m is likely to be necessary in more energetic international waters.
Place, publisher, year, edition, pages
2016. Vol. 9, no 9, 730
wave energy converter (WEC); electrical control; damping force; wave energy
IdentifiersURN: urn:nbn:se:uu:diva-303356DOI: 10.3390/en9090730ISI: 000383547900067OAI: oai:DiVA.org:uu-303356DiVA: diva2:971633
FunderSweGRIDS - Swedish Centre for Smart Grids and Energy StorageSwedish Research Council, 621-2009-3417Swedish Energy AgencyVINNOVAGöran Gustafsson Foundation for promotion of scientific research at Uppala University and Royal Institute of Technology