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

Authors: Simon Thomas; Marianna Giassi; Malin Göteman; Martyn Hann; Edward Ransley; Jan Isberg; Jens Engström;

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

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.

Country
Sweden
Related Organizations
Keywords

Technology, Other Electrical Engineering, Electronic Engineering, Information Engineering, T, wave tank test, wave energy; power take-off; direct-driven; wave tank test; physical scale model; natural frequency tuning; floating point absorber, direct-driven, natural frequency tuning, wave energy; power take-off; direct-driven; wave tank test; physical scale model; natural frequency tuning; floating point absorber, floating point absorber, power take-off, physical scale model, Annan elektroteknik och elektronik, wave energy

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    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    12
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
12
Top 10%
Average
Top 10%
Green
gold
Related to Research communities
Energy Research