This paper presents design studies of the gravity-based foundation for a linear generator wave energy converter. The wave energy converter is based on a direct driven generator mounted on the gravity-based foundation located at the seabed. The linear generator is connected to a point absorbing buoy on the sea surface via a connection rope. Such a device, developed at Uppsala University, has been in operation on the Swedish west coast since 2006. Study is focused on the analysis of the impact from undesirable motions of the gravity-based foundation, particularly the study of the tip and lifts phenomena with regard to the heave and surge forces. Long-term extreme significant wave heights are extrapolated from the statistical analysis of the measured wave climate data in the test site where the wave energy converter is deployed. The joint distribution of the significant wave height and the zero-crossing period from the measured wave climate is also analyzed to estimate the associated periods with respect to the long-term extreme significant wave height. The 25 years return extreme significant wave height 4.8 m which is associated with its mean zero-crossing period 8.25 s from the joint distribution is chosen to determine the characteristics of the possible maximum wave for the Lysekil test site. The estimated maximum wave 9.2 m is used to estimate the extreme values of the heave and surge forces on the wave energy converter and the gravity-based foundation. The results with respect to the foundation of a new generation wave energy converter about 35 tons with the presented methodology indicate that a heavier foundation which is about 70 tons needs to be designed in terms of considering the stability of the mooring foundation for long term real sea operation. The purpose of this paper is to propose a reliable approach to estimate the appropriate dimensions for gravity-based foundation of the linear generator wave energy converter and provides a theoretical reference to the construction of the gravity-based foundation.
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November 2015
Research Article|
November 25 2015
Study of the foundation design for a linear generator wave energy converter using stochastic methods
Wei Li
;
Wei Li
a)
1Division of Electricity, Department of Engineering Sciences, Swedish Centre for Electricity Energy Conversion,
Uppsala University
, Box 534, SE-751 21 Uppsala, Sweden
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Jan Isberg
;
Jan Isberg
1Division of Electricity, Department of Engineering Sciences, Swedish Centre for Electricity Energy Conversion,
Uppsala University
, Box 534, SE-751 21 Uppsala, Sweden
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Jens Engström;
Jens Engström
1Division of Electricity, Department of Engineering Sciences, Swedish Centre for Electricity Energy Conversion,
Uppsala University
, Box 534, SE-751 21 Uppsala, Sweden
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Rafael Waters;
Rafael Waters
1Division of Electricity, Department of Engineering Sciences, Swedish Centre for Electricity Energy Conversion,
Uppsala University
, Box 534, SE-751 21 Uppsala, Sweden
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Mats Leijon
Mats Leijon
1Division of Electricity, Department of Engineering Sciences, Swedish Centre for Electricity Energy Conversion,
Uppsala University
, Box 534, SE-751 21 Uppsala, Sweden
2Engineering and the Environment,
University of Southampton
, Highfield Campus, Southampton SO17 1BJ, United Kingdom
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]. Tel./fax: +46184715849.
J. Renewable Sustainable Energy 7, 063112 (2015)
Article history
Received:
November 18 2014
Accepted:
November 09 2015
Citation
Wei Li, Jan Isberg, Jens Engström, Rafael Waters, Mats Leijon; Study of the foundation design for a linear generator wave energy converter using stochastic methods. J. Renewable Sustainable Energy 1 November 2015; 7 (6): 063112. https://doi.org/10.1063/1.4936420
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