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Energies 2012, 5(4), 1001-1017; doi:10.3390/en5041001

Design Specifications for the Hanstholm WEPTOS Wave Energy Converter

1,* , 1
1 Department of Civil Engineering, Aalborg University, Aalborg 9000, Denmark 2 WEPTOS A/S, Fredericia7000, Denmark
* Author to whom correspondence should be addressed.
Received: 14 February 2012 / Revised: 9 April 2012 / Accepted: 9 April 2012 / Published: 18 April 2012
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The WEPTOS wave energy converter (WEC) is a novel device that combines an established and efficient wave energy absorbing mechanism with a smart structure, which can regulate the amount of incoming wave energy and reduce loads in extreme wave conditions. This adjustable A-shaped slack-moored and floating structure absorbs the energy of the waves through a multitude of rotors. The shape of the rotors is based on the renowned Salter’s Duck. On each leg, the rotors pivot around a common axle, through which the rotors transfer the absorbed power to a common power take off system. The study investigates the required capacity of the power take off (PTO) system and the structural forces on a WEPTOS WEC prototype, intended for installation at Hanstholm (Denmark), based on large scale experimental tests using a highly realistic laboratory model of the complete device. The results hereof includes the rotational speed and transmitted torque (and hereby power) to the PTO system using different PTO control strategies, the impact of fluctuations of the available mechanical power and the effect of limiting the PTO capacity on the annual energy production. Acquisition of structural forces includes mooring forces and structural bending moments in both production and extreme wave conditions, illustrating that the regulation of the angle in the A shape ensures that extreme forces on the structure can be kept in the same order of magnitude as in production conditions.
Keywords: WEPTOS; wave energy; marine structure; generator capacity; structural forces; ocean technology; mooring force WEPTOS; wave energy; marine structure; generator capacity; structural forces; ocean technology; mooring force
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Pecher, A.; Kofoed, J.P.; Larsen, T. Design Specifications for the Hanstholm WEPTOS Wave Energy Converter. Energies 2012, 5, 1001-1017.

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