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Impact of Generator Stroke Length on Energy Production for a Direct Drive Wave Energy Converter

Division for Electricity, Uppsala University, Uppsala 75121, Sweden
Seabased AB, Sylveniusgatan 5 D, Uppsala 75450, Sweden
Author to whom correspondence should be addressed.
Academic Editor: Stephen Nash
Energies 2016, 9(9), 730;
Received: 25 June 2016 / Revised: 29 August 2016 / Accepted: 31 August 2016 / Published: 9 September 2016
(This article belongs to the Special Issue Numerical Modelling of Wave and Tidal Energy)
PDF [2890 KB, uploaded 9 September 2016]


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. View Full-Text
Keywords: wave energy converter (WEC); electrical control; damping force; wave energy wave energy converter (WEC); electrical control; damping force; wave energy

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Hong, Y.; Eriksson, M.; Boström, C.; Waters, R. Impact of Generator Stroke Length on Energy Production for a Direct Drive Wave Energy Converter. Energies 2016, 9, 730.

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