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Hull geometry optimisation of wave energy converters: On the choice of the objective functions and the optimisation formulation

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  • Garcia-Teruel, Anna
  • DuPont, Bryony
  • Forehand, David I.M.

Abstract

Wave Energy Converters (WECs) with optimised geometries and control systems have been developed in recent years to advance marine energy technologies towards commercialisation. In particular, a number of WEC hull geometry optimisation studies have been performed, due to the high cost reduction potential associated with the device structure. However, no standard and consistent method has been established for this purpose. For example, different optimisation formulations (single-objective and multi-objective), have been used, applying different optimisation algorithms. Additionally, a range of objective functions have been employed, where power maximisation has been represented through a variety of metrics, and cost minimisation expressed with diverse cost proxies. The goal of this study is to address the challenge of finding a suitable optimisation problem formulation with single-objective or multi-objective implementations, and the respective objective functions, that support the exploration of shapes that reduce the levelised cost of energy. Results show that submerged surface area cost proxies are more suitable for this purpose than volume-based cost proxies. Results from a multi-objective optimisation formulation can provide a good understanding of the solution space, whereas results from single-objective studies can be used for seeding these multi-objective optimisation approaches.

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  • Garcia-Teruel, Anna & DuPont, Bryony & Forehand, David I.M., 2021. "Hull geometry optimisation of wave energy converters: On the choice of the objective functions and the optimisation formulation," Applied Energy, Elsevier, vol. 298(C).
    • Handle: RePEc:eee:appene:v:298:y:2021:i:c:s0306261921005845
    DOI: 10.1016/j.apenergy.2021.117153
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    2. Tiesheng Liu & Yanjun Liu & Shuting Huang & Gang Xue, 2022. "Shape Optimization of Oscillating Buoy Wave Energy Converter Based on the Mean Annual Power Prediction Model," Energies, MDPI, vol. 15(20), pages 1-19, October.
    3. Garcia-Teruel, Anna & Forehand, David I.M., 2022. "Manufacturability considerations in design optimisation of wave energy converters," Renewable Energy, Elsevier, vol. 187(C), pages 857-873.
    4. Garcia-Teruel, Anna & Roberts, Owain & Noble, Donald R. & Henderson, Jillian Catherine & Jeffrey, Henry, 2022. "Design limits for wave energy converters based on the relationship of power and volume obtained through multi-objective optimisation," Renewable Energy, Elsevier, vol. 200(C), pages 492-504.
    5. Tagliafierro, Bonaventura & Martínez-Estévez, Iván & Domínguez, José M. & Crespo, Alejandro J.C. & Göteman, Malin & Engström, Jens & Gómez-Gesteira, Moncho, 2022. "A numerical study of a taut-moored point-absorber wave energy converter with a linear power take-off system under extreme wave conditions," Applied Energy, Elsevier, vol. 311(C).

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