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

Author

Listed:
  • Simon Thomas

    (Lägerhyddsvägen 1, Division of Electricity, Angströmlaboratoriet, Uppsala University, 75237 Uppsala, Sweden)

  • Marianna Giassi

    (Lägerhyddsvägen 1, Division of Electricity, Angströmlaboratoriet, Uppsala University, 75237 Uppsala, Sweden)

  • Malin Göteman

    (Lägerhyddsvägen 1, Division of Electricity, Angströmlaboratoriet, Uppsala University, 75237 Uppsala, Sweden)

  • Martyn Hann

    (School of Engineering, University of Plymouth, Drake Circuit, Plymouth PL4 8AA, UK)

  • Edward Ransley

    (School of Engineering, University of Plymouth, Drake Circuit, Plymouth PL4 8AA, UK)

  • Jan Isberg

    (Lägerhyddsvägen 1, Division of Electricity, Angströmlaboratoriet, Uppsala University, 75237 Uppsala, Sweden)

  • Jens Engström

    (Lägerhyddsvägen 1, Division of Electricity, Angströmlaboratoriet, Uppsala University, 75237 Uppsala, Sweden)

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.

Suggested Citation

  • Simon Thomas & Marianna Giassi & Malin Göteman & Martyn Hann & Edward Ransley & Jan Isberg & Jens Engström, 2018. "Performance of a Direct-Driven Wave Energy Point Absorber with High Inertia Rotatory Power Take-off," Energies, MDPI, vol. 11(9), pages 1-17, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2332-:d:167697
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    References listed on IDEAS

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    Cited by:

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    2. Xiaohui Zeng & Qi Wang & Yuanshun Kang & Fajun Yu, 2022. "A Novel Type of Wave Energy Converter with Five Degrees of Freedom and Preliminary Investigations on Power-Generating Capacity," Energies, MDPI, vol. 15(9), pages 1-20, April.
    3. Wang, Mangkuan & Shang, Jianzhong & Luo, Zirong & Lu, Zhongyue & Yao, Ganzhou, 2023. "Theoretical and numerical studies on improving absorption power of multi-body wave energy convert device with nonlinear bistable structure," Energy, Elsevier, vol. 282(C).
    4. Li, Xiaofan & Liang, Changwei & Chen, Chien-An & Xiong, Qiuchi & Parker, Robert G. & Zuo, Lei, 2020. "Optimum power analysis of a self-reactive wave energy point absorber with mechanically-driven power take-offs," Energy, Elsevier, vol. 195(C).
    5. Stavropoulou, Charitini & Goude, Anders & Katsidoniotaki, Eirini & Göteman, Malin, 2023. "Fast time-domain model for the preliminary design of a wave power farm," Renewable Energy, Elsevier, vol. 219(P2).
    6. Simon Thomas & Mikael Eriksson & Malin Göteman & Martyn Hann & Jan Isberg & Jens Engström, 2018. "Experimental and Numerical Collaborative Latching Control of Wave Energy Converter Arrays," Energies, MDPI, vol. 11(11), pages 1-16, November.

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