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Power Absorption of A Two-Body Heaving Wave Energy Converter Considering Different Control and Power Take-off Systems

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Abstract

This study proposed a wave power system with two coaxial floating cylinders of different diameters and drafts. Wavebob’s conceptual design has been adopted in the wave power system. In this study, a basic analysis of the wave energy extraction by the relative motion between two floats is presented. The maximum power absorption was studied theoretically under regular wave conditions, and the effects of both linear and constant dam** forces on the power take-off (PTO) were investigated. A set of dynamic equations describing the floats’ displacement under regular waves and different PTOs are established. A time-domain numerical model is developed, considering the PTO parameter and viscous dam**, and the optimal PTO dam** and output power are obtained. With the analysis of estimating the maximum power absorption, a new estimation method called Power Capture Function (PCF) is proposed and constructed, which can be used to predict the power capture under both linear and constant PTO forces. Based on this, energy extraction is analyzed and optimized. Finally, the performance characteristics of the two-body power system are concluded.

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Authors and Affiliations

  1. Department of Ocean Engineering, College of Engineering, Ocean University of China, Qingdao, 266100, China

    **ao-chen Dong, De-min Li & Hong-da Shi

  2. Department of Marine Technology and Centre for Autonomous Marine Operations and Systems (AMOS), Norwegian University of Science and Technology (NTNU), Trondheim, 7491, Norway

    Zhen Gao

  3. Shandong Provincial Key Laboratory of Ocean Engineering, Ocean University of China, Qingdao, 266100, China

    Hong-da Shi

  4. Qingdao Municipal Key Laboratory of Ocean Renewable Energy, Ocean University of China, Qingdao, 266100, China

    Hong-da Shi

  5. Institute of Marine Science and Technology, Shandong University, Qingdao, 266237, China

    Shu-ting Huang

Authors
  1. **ao-chen Dong
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  2. Zhen Gao
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  3. De-min Li
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  4. Shu-ting Huang
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  5. Hong-da Shi
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Correspondence to Hong-da Shi.

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This work was financially supported by the National Key R&D Program of China (Grant No. 2018YFB1501904), the Shandong Provincial Key R&D Program (Grant No. 2019JZZY010902), the National Natural Science Foundation of China (Grant No. 52071303), the Joint Project of NSFC-SD (Grant No. U1906228), and the Taishan Scholars Program of Shandong Province (Grant No. ts20190914).

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Dong, Xc., Gao, Z., Li, Dm. et al. Power Absorption of A Two-Body Heaving Wave Energy Converter Considering Different Control and Power Take-off Systems. China Ocean Eng 36, 15–27 (2022). https://doi.org/10.1007/s13344-022-0001-3

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  • DOI: https://doi.org/10.1007/s13344-022-0001-3

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