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Analysis and optimization of a tethered wave energy converter in irregular waves

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  • Bachynski, Erin E.
  • Young, Yin Lu
  • Yeung, Ronald W.

Abstract

An understanding of the fundamental system dynamics of wave energy converters (WECs) is required to safely and reliably benefit from the available wave energy resource to produce electricity. The effects of the geometry, mooring system, and mass distribution on the idealized power takeoff of a tethered wave energy absorber in irregular waves are examined. The effects on coupled pitch and sway motions are also considered using a linear frequency-domain method, based on potential flow theory, to obtain the hydrodynamic coefficients. Superposition is used to calculate the response in irregular waves. The objectives of this paper are to examine the characteristic system response of WECs, and to demonstrate the use of an efficient potential-based method for the optimization of a WEC to maximize the annual power takeoff while ensuring system safety at a given site. The analyses suggest that the idealized power takeoff damping increases with the size of the WEC, with the intensity of motion limited. A relatively light mooring system has little effect on the power takeoff, but it introduces a low-frequency coupled pitch-surge resonance that can cause system failure if subject to long-period swells. To mitigate the risk of coupled surge-pitch related failures, a low center of gravity and a low radius of gyration of the floater about the center of floatation are recommended. The results also demonstrate the importance of tuning the system for the site-specific probabilistic wave climate in order to maximize total energy capture and avoid potential failures.

Suggested Citation

  • Bachynski, Erin E. & Young, Yin Lu & Yeung, Ronald W., 2012. "Analysis and optimization of a tethered wave energy converter in irregular waves," Renewable Energy, Elsevier, vol. 48(C), pages 133-145.
  • Handle: RePEc:eee:renene:v:48:y:2012:i:c:p:133-145
    DOI: 10.1016/j.renene.2012.04.044
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    References listed on IDEAS

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    1. Agamloh, Emmanuel B. & Wallace, Alan K. & von Jouanne, Annette, 2008. "Application of fluid–structure interaction simulation of an ocean wave energy extraction device," Renewable Energy, Elsevier, vol. 33(4), pages 748-757.
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    Cited by:

    1. Vincenzo Piscopo & Guido Benassai & Renata Della Morte & Antonio Scamardella, 2018. "Cost-Based Design and Selection of Point Absorber Devices for the Mediterranean Sea," Energies, MDPI, vol. 11(4), pages 1-23, April.
    2. Sergiienko, N.Y. & Cazzolato, B.S. & Ding, B. & Arjomandi, M., 2016. "An optimal arrangement of mooring lines for the three-tether submerged point-absorbing wave energy converter," Renewable Energy, Elsevier, vol. 93(C), pages 27-37.
    3. Josh Davidson & John V. Ringwood, 2017. "Mathematical Modelling of Mooring Systems for Wave Energy Converters—A Review," Energies, MDPI, vol. 10(5), pages 1-46, May.
    4. Tunde Aderinto & Hua Li, 2020. "Conceptual Design and Simulation of a Self-Adjustable Heaving Point Absorber Based Wave Energy Converter," Energies, MDPI, vol. 13(8), pages 1-15, April.
    5. Xu, Sheng & Wang, Shan & Guedes Soares, C., 2019. "Review of mooring design for floating wave energy converters," Renewable and Sustainable Energy Reviews, Elsevier, vol. 111(C), pages 595-621.
    6. Gao, Hong & Yu, Yang, 2018. "The dynamics and power absorption of cone-cylinder wave energy converters with three degree of freedom in irregular waves," Energy, Elsevier, vol. 143(C), pages 833-845.
    7. Zhao, Yunpeng & Fan, Zhongqi & Bi, Chunwei & Wang, Hao & Mi, Jianchun & Xu, Minyi, 2022. "On hydrodynamic and electrical characteristics of a self-powered triboelectric nanogenerator based buoy under water ripples," Applied Energy, Elsevier, vol. 308(C).
    8. Piscopo, V. & Benassai, G. & Della Morte, R. & Scamardella, A., 2020. "Towards a unified formulation of time and frequency-domain models for point absorbers with single and double-body configuration," Renewable Energy, Elsevier, vol. 147(P1), pages 1525-1539.
    9. Chen, Zhongfei & Zhang, Liang & Yeung, Ronald W., 2019. "Analysis and optimization of a Dual Mass-Spring-Damper (DMSD) wave-energy convertor with variable resonance capability," Renewable Energy, Elsevier, vol. 131(C), pages 1060-1072.
    10. Guo, Bingyong & Ringwood, John V., 2021. "Geometric optimisation of wave energy conversion devices: A survey," Applied Energy, Elsevier, vol. 297(C).
    11. Gao, Hong & Xiao, Jie, 2021. "Effects of power take-off parameters and harvester shape on wave energy extraction and output of a hydraulic conversion system," Applied Energy, Elsevier, vol. 299(C).
    12. Tunde Aderinto & Hua Li, 2019. "Review on Power Performance and Efficiency of Wave Energy Converters," Energies, MDPI, vol. 12(22), pages 1-24, November.
    13. Zhang, Xiantao & Tian, XinLiang & Xiao, Longfei & Li, Xin & Lu, Wenyue, 2019. "Mechanism and sensitivity for broadband energy harvesting of an adaptive bistable point absorber wave energy converter," Energy, Elsevier, vol. 188(C).
    14. Ren, Junqing & Jin, Peng & Liu, Yingyi & Zang, Jun, 2021. "Wave attenuation and focusing by a parabolic arc pontoon breakwater," Energy, Elsevier, vol. 217(C).
    15. Gao, Hong & Xiao, Jie & Liang, Ruizhi, 2024. "Capture mechanism of a multi-dimensional wave energy converter with a strong coupling parallel drive," Applied Energy, Elsevier, vol. 361(C).
    16. Fadaeenejad, M. & Shamsipour, R. & Rokni, S.D. & Gomes, C., 2014. "New approaches in harnessing wave energy: With special attention to small islands," Renewable and Sustainable Energy Reviews, Elsevier, vol. 29(C), pages 345-354.
    17. Raju Ahamed & Kristoffer McKee & Ian Howard, 2022. "A Review of the Linear Generator Type of Wave Energy Converters’ Power Take-Off Systems," Sustainability, MDPI, vol. 14(16), pages 1-42, August.
    18. Zhang, Xiantao & Tian, Xinliang & Xiao, Longfei & Li, Xin & Chen, Lifen, 2018. "Application of an adaptive bistable power capture mechanism to a point absorber wave energy converter," Applied Energy, Elsevier, vol. 228(C), pages 450-467.
    19. Chen, Zhongfei & Zhou, Binzhen & Zhang, Liang & Li, Can & Zang, Jun & Zheng, Xiongbo & Xu, Jianan & Zhang, Wanchao, 2018. "Experimental and numerical study on a novel dual-resonance wave energy converter with a built-in power take-off system," Energy, Elsevier, vol. 165(PA), pages 1008-1020.
    20. Zang, Zhipeng & Zhang, Qinghe & Qi, Yue & Fu, Xiaoying, 2018. "Hydrodynamic responses and efficiency analyses of a heaving-buoy wave energy converter with PTO damping in regular and irregular waves," Renewable Energy, Elsevier, vol. 116(PA), pages 527-542.
    21. Elie Al Shami & Ran Zhang & Xu Wang, 2018. "Point Absorber Wave Energy Harvesters: A Review of Recent Developments," Energies, MDPI, vol. 12(1), pages 1-36, December.

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