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Developments in the design of the PS Frog MK5 Wave Energy Converter.

Aggidis, George A. and Bradshaw, A. and McCabe, A. and Meadowcroft, J. (2006) Developments in the design of the PS Frog MK5 Wave Energy Converter. Renewable Energy, 31 (2). pp. 141-151. ISSN 0960-1481

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Abstract

This paper describes one of the innovative wave energy converters under development by the Lancaster University Renewable Energy Group. An offshore point-absorber wave energy converter, PS Frog Mk 5 consists of a large buoyant paddle with an integral ballasted ‘handle’ hanging below it. The waves act on the blade of the paddle and the ballast beneath provides the necessary reaction. When the WEC is pitching, power is extracted by partially resisting the sliding of a power-take-off mass, which moves in guides above sea level. Totally enclosed in a steel hull, with no external moving parts, PS Frog Mk. 5 is at least as robust as a ship and the survivability of the device is currently under investigation, though such work is beyond the scope of this paper. Such a device could be very economic in terms of power output per unit of capital cost. New inventive steps with experimental results and computer studies have led to promising improvements to the hull shape. The WEC is maintained in a resonant state by the use of special means to maintain a high dynamic magnifier in irregular seas. A robust feedback control system has been developed to ensure stability and maintain efficient power take-off. Some of these developments are described and illustrated with the results of computer simulations that show power outputs and device motion over a range of conditions. It is shown that useful advances have been made, with the power capture bordering on 2 MW in an increasing proportion of sea states.

Item Type: Article
Journal or Publication Title: Renewable Energy
Additional Information: This paper presents an innovative wave energy converter PS Frog Mark 5 that was selected and invited by the Carbon Trust to participate in its Marine Energy Challenge (CTC 601 report 2006 ""Future Marine Energy). This involved eight International wave energy device developers (four UK, two from EU and two from USA). PS Frog was the only University based participant to be invited from this worldwide selection. RAE_import_type : Journal article RAE_uoa_type : General Engineering
Uncontrolled Keywords: Wave energy converter ; Point absorber ; Power estimation.
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: Faculty of Science and Technology > Engineering
ID Code: 2661
Deposited By: ep_importer
Deposited On: 27 Mar 2008 13:22
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:16
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/2661

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