Extreme Loads on the Mooring Lines and Survivability Mode for the Wave Dragon Wave Energy Converter

Stefano Parmeggiani, Jens Peter Kofoed, E. Friis-Madsen

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Abstract

One of the main challenges Wave Energy Converters have to face on the road towards commercialization is to ensure survivability in extreme condition at a reasonable capital costs. For a floating device like the Wave Dragon, a reliable mooring system is essential. The control strategy of the Wave Dragon aims at optimizing the power production by adapting the floating level to the incoming waves and by activating the hydro-turbines and regulating their working speed. In extreme conditions though, the control strategy could be changed in order to reduce the forces in the mooring system, lowering the design requirements with almost no added cost. The paper presents the result of the tank testing of a 1:51.8 scale model of a North Sea Wave Dragon in extreme wave conditions of up to 100 years of return period. The results show that the extreme loads in the main mooring line can be reduced by approximately 20-30% by lowering the crest level and balancing the device to lean a little towards the front.
Original languageEnglish
Title of host publicationProceedings of the World Renewable Energy Congress 2011 : 8-11 May 2011, Linköping, Sweden
Number of pages8
PublisherLinköping University
Publication date2011
ChapterMarine and Ocean Technology (MO)
Publication statusPublished - 2011
EventWorld Renewable Energy Congress 2011 - Linköping, Sweden
Duration: 8 May 201113 May 2011

Conference

ConferenceWorld Renewable Energy Congress 2011
CountrySweden
CityLinköping
Period08/05/201113/05/2011

Keywords

  • Wave Dragon
  • Wave Energy Converters
  • Survivability
  • Mooring Systems
  • Control Strategies

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  • Projects

    Structural design of wave energy devices

    Kofoed, J. P., Frigaard, P., Sørensen, J. D., Pedersen, J. K., Lu, K., Sørensen, J. T., Bingham, H., Ferreira, C. B., Zanuttigh, B., Estefan, S. F., Nielsen, K., Brito-Melo, A., Sterndorff, M., Ingram, D. & Bard, J.

    01/01/201031/12/2014

    Project: Research

    Cite this

    Parmeggiani, S., Kofoed, J. P., & Friis-Madsen, E. (2011). Extreme Loads on the Mooring Lines and Survivability Mode for the Wave Dragon Wave Energy Converter. In Proceedings of the World Renewable Energy Congress 2011: 8-11 May 2011, Linköping, Sweden Linköping University.