Dual-frequency power capture performance and harvesting source identification of a spring pendulum buoy wave energy converter

Shuting Huang, Mingyu Yang, Xingyao Wang, Changdong Wei, Jingran Ma and Yanjun Liu

Energy, 2025, vol. 322, issue C

Abstract: The contradiction between the narrow power capture bandwidth and the wave energy spectral distribution leads to the suboptimal generating efficiency of wave energy buoys in real sea. A novel spring pendulum buoy was proposed to use its dual-frequency performance, stemming from two motion degrees of freedom, for efficient harvesting in bimodal Ochi-Hubble spectral seas with wind wave and swell. A novel energy harvesting source identification method was proposed to assess its power capture performance from wind wave and swell respectively. Validation was conducted through a wave tank experiment. Dual-frequency power capture performance was analyzed, with a particular focus on perspectives from the degree of freedom and the frequency distribution. Effects of structure coefficients were analyzed. Results showed that the spring pendulum buoy has a significant dual-frequency power capture characteristic and a significant broader high-efficiency frequency bandwidth. The combination of two degrees of freedom is the main reason for the dual-frequency power performance. The spring swing arm only enhances the dual-frequency power capture of rotation. The PTO damping's effect becomes more complicated because of the shifting motion balance position. This dual-frequency characteristic effectively enhances its power capture in bimodal Ochi-Hubble waves, particularly improving the power capture from high-frequency wind waves.

Keywords: Wave energy; Oscillating buoy; Spring pendulum; Nonlinear hydrodynamic response; Power capture (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:322:y:2025:i:c:s0360544225013507

DOI: 10.1016/j.energy.2025.135708

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