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Ocean Engineering

Experimental Results From an Offshore Wave Energy Converter

[+] Author and Article Information
Cecilia Boström

Department of Engineering Sciences, Swedish Centre for Renewable Electric Energy Conversion, Division for Electricity, Uppsala University, P.O. Box 534, SE-75121 Uppsala, Swedencecilia.bostrom@angstrom.uu.se

Erik Lejerskog

 Seabased Industry AB, Dag Hammarskjölds väg 52B, SE-75183 Uppsala, Swedenerik.lejerskog@seabased.com

Simon Tyrberg

Department of Engineering Sciences, Swedish Centre for Renewable Electric Energy Conversion, Division for Electricity, Uppsala University, P.O. Box 534, SE-75121 Uppsala, Swedensimon.tyrberg@angstrom.uu.se

Olle Svensson

Department of Engineering Sciences, Swedish Centre for Renewable Electric Energy Conversion, Division for Electricity, Uppsala University, P.O. Box 534, SE-75121 Uppsala, Swedenolle.svensson@angstrom.uu.se

Rafael Waters

Department of Engineering Sciences, Swedish Centre for Renewable Electric Energy Conversion, Division for Electricity, Uppsala University, P.O. Box 534, SE-75121 Uppsala, Swedenrafael.waters@angstrom.uu.se

Andrej Savin

Department of Engineering Sciences, Swedish Centre for Renewable Electric Energy Conversion, Division for Electricity, Uppsala University, P.O. Box 534, SE-75121 Uppsala, Swedenandrej.savin@angstrom.uu.se

Björn Bolund

 Seabased Industry AB, Dag Hammarskjölds väg 52B, SE-75183 Uppsala, Swedenbjorn.bolund@seabased.com

Mikael Eriksson

 Seabased Industry AB, Dag Hammarskjölds väg 52B, SE-75183 Uppsala, Swedenmikael.eriksson@seabased.com

Mats Leijon

Department of Engineering Sciences, Swedish Centre for Renewable Electric Energy Conversion, Division for Electricity, Uppsala University, P.O. Box 534, SE-75121 Uppsala, Swedenmats.leijon@angstrom.uu.se

J. Offshore Mech. Arct. Eng 132(4), 041103 (Sep 24, 2010) (5 pages) doi:10.1115/1.4001443 History: Received September 30, 2009; Revised January 22, 2010; Published September 24, 2010; Online September 24, 2010

An offshore wave energy converter (WEC) was successfully launched at the Swedish west coast in the middle of March 2006. The WEC is based on a permanent magnet linear generator located on the sea floor driven by a point absorber. A measuring station has been installed on a nearby island where all measurements and experiments on the WEC have been carried out. The output voltage from the generator fluctuates both in amplitude and frequency and must therefore be converted to enable grid connection. In order to study the voltage conversion, the measuring station was fitted with a six pulse diode rectifier and a capacitive filter during the autumn of 2006. The object of this paper is to present a detailed description of the Lysekil research site. Special attention will be given to the power absorption by the generator when it is connected to a nonlinear load.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Map showing the location of the site

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Figure 2

A general figure over the Lysekil research site

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Figure 3

(a) Photo of the deployed WEC just before installation, (b) the observation tower for visual and weather studies, (c) picture of one of the new generators during the construction phase, and (d) the buoy field seen from the tower

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Figure 4

The installation of rectifier and ultracapacitors in the measuring station

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Figure 5

Circuit diagram of the electrical system

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Figure 6

Discharge curves for a 24.3 F capacitor connected to three different resistive loads

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Figure 7

The absorbed power A, in percent, by the buoy on the y-axis and the significant wave height on the x-axis. Every data point represents a mean value calculated over a 30 min period.

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Figure 8

The absorbed power in kilowatt as a function of significant wave height in meter

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Figure 9

Power produced by the generator; sea cable losses are included. The time series are sampled at a similar sea state. In (a) the resistive part of the load is 9.2 Ohm and in (b) the resistive part of the load is 27.5 Ohm.

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