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Efficiency analysis of a 3-DOF wave energy converter (SJTU-WEC) based on modeling, simulation and experiment

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  • Chen, Weixing
  • Wu, Zheng
  • Liu, Jimu
  • Jin, Zhenlin
  • Zhang, Xiantao
  • Gao, Feng

Abstract

Wave energy is one of the most remarkable energy in the ocean, which bears attractive characteristics including inexhaustible, renewable and more predictable. Nowadays, the development of the wave energy converter (WEC) is still in the research stage; improving the efficiency is one of the key steps to promote the application process of WECs. This paper proposes a novel 3-degree-of-freedom (3-DOF) WEC called SJTU-WEC; moreover, methods to obtain the conversion efficiency for the each part are proposed. First, the principle of the SJTU-WEC is introduced, and the dynamic model of the SJTU-WEC is established; Next, the capture width ratios (CWRs) of the SJTU-WEC under different waves are obtained based on the Simulink model, and the simulation results show that optimal CWR is above 80%. A 1:80 scaled prototype of the 3-DOF mechanism is built, and the mechanical efficiency for the mechanism is tested to be about 90%. Moreover, a 1:4 scaled prototype of the energy conversion device (ECD) is built, and the efficiency of the ECD based on the power recovery method is tested to be about 80%. Finally, based on the modeling, simulation and experiment, the optimal conversion efficiency from the wave energy to the hydraulic energy of the SJTU-WEC is predicted to be more than 57.6%.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:220:y:2021:i:c:s0360544220328255
    DOI: 10.1016/j.energy.2020.119718
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    References listed on IDEAS

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