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Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off

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      Abstract

      An alternating rotatory generator using an eddy current break is developed as a physical scale model of a direct-driven floating point absorber power take-off (PTO) for wave tank tests. It is shown that this design is a simple and cost-effective way to get an accurate linear damping PTO. The device shows some beneficial characteristics, making it an interesting option for full scale devices: For similar weights the inertia can be significantly higher than for linear generators, allowing it to operate with natural frequencies close to typical wave frequencies. The influence of the higher inertia on the power absorption is tested using both a numerical simulation and physical wave tank tests. With the increased inertia the PTO is able to absorb more than double the energy of a comparable direct-driven linear generator in some sea states. Moreover, the alternating rotatory generator allows the absorption characteristic to be tuned by changing the inertia and the generator damping.

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      Wave energy in Europe: current status and perspectives

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        Comparison of Direct-Drive and Geared Generator Concepts for Wind Turbines

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          The state of the art of wind energy conversion systems and technologies: A review

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            Author and article information

            Journal
            ENERGA
            Energies
            Energies
            MDPI AG
            1996-1073
            September 2018
            September 04 2018
            : 11
            : 9
            : 2332
            10.3390/en11092332
            © 2018

            https://creativecommons.org/licenses/by/4.0/

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            Self URI (article page): http://www.mdpi.com/1996-1073/11/9/2332

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