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Theoretical study on the power take-off estimation of heaving buoy wave energy converter

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  • Shi, Hongda
  • Cao, Feifei
  • Liu, Zhen
  • Qu, Na

Abstract

Heaving buoy wave energy converter is applicable to small wave height and short wave period, which are the main characteristics of the China Sea. The device captures the wave power by buoy's heaving motion, transfers it by hydraulic system, and converts it into the electric power by generator. Power Take-Off (PTO) of the device is related to the resistance of the hydraulic system. However, effects of the hydraulic damping on the motion of buoy are often neglected and the study on the optimal hydraulic system is rare. In this paper, a new theoretical analysis has been developed, which is more applicable to the buoy considering hydraulic system. The paper establishes the governing equation considering buoyancy, wave dynamic force and hydraulic damping. The displacement and the velocity of the buoy are both obtained. The time-averaged power captured is calculated by integrating the square-velocity expression derived, and the existence of the maximum PTO is proved. Theoretical result is compared with the experimental result. The paper demonstrates the displacements and average output power of the buoy with different values of damping and inertia coefficients. The results of the study could be a guidance for the PTO design of the heaving buoy sets.

Suggested Citation

  • Shi, Hongda & Cao, Feifei & Liu, Zhen & Qu, Na, 2016. "Theoretical study on the power take-off estimation of heaving buoy wave energy converter," Renewable Energy, Elsevier, vol. 86(C), pages 441-448.
    • Handle: RePEc:eee:renene:v:86:y:2016:i:c:p:441-448
    DOI: 10.1016/j.renene.2015.08.027
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    Cited by:

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    3. Yadong Wen & Weijun Wang & Hua Liu & Longbo Mao & Hongju Mi & Wenqiang Wang & Guoping Zhang, 2018. "A Shape Optimization Method of a Specified Point Absorber Wave Energy Converter for the South China Sea," Energies, MDPI, vol. 11(10), pages 1-22, October.
    4. Jahangir, Mohammad Hossein & Hosseini, Seyed Sina & Mehrpooya, Mehdi, 2018. "A detailed theoretical modeling and parametric investigation of potential power in heaving buoys," Energy, Elsevier, vol. 154(C), pages 201-209.
    5. Mohd Afifi Jusoh & Mohd Zamri Ibrahim & Muhamad Zalani Daud & Aliashim Albani & Zulkifli Mohd Yusop, 2019. "Hydraulic Power Take-Off Concepts for Wave Energy Conversion System: A Review," Energies, MDPI, vol. 12(23), pages 1-23, November.
    6. Yu, Tongshun & Chen, Xingyu & Tang, Yuying & Wang, Junrong & Wang, Yuqiao & Huang, Shuting, 2023. "Numerical modelling of wave run-up heights and loads on multi-degree-of-freedom buoy wave energy converters," Applied Energy, Elsevier, vol. 344(C).
    7. Yu, Tongshun & Shi, Hongda & Song, Wenfu, 2018. "Rotational characteristics and capture efficiency of a variable guide vane wave energy converter," Renewable Energy, Elsevier, vol. 122(C), pages 275-290.
    8. Murai, Motohiko & Li, Qiao & Funada, Junki, 2021. "Study on power generation of single Point Absorber Wave Energy Converters (PA-WECs) and arrays of PA-WECs," Renewable Energy, Elsevier, vol. 164(C), pages 1121-1132.
    9. Chen, Weixing & Wu, Zheng & Liu, Jimu & Jin, Zhenlin & Zhang, Xiantao & Gao, Feng, 2021. "Efficiency analysis of a 3-DOF wave energy converter (SJTU-WEC) based on modeling, simulation and experiment," Energy, Elsevier, vol. 220(C).

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