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A method for comparing wave energy converter conceptual designs based on potential power capture

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  • Bubbar, K.
  • Buckham, B.
  • Wild, P.

Abstract

The design space for ocean wave energy converters is notable for its divergence. To facilitate convergence, and thereby support commercialization, we present a new simple method for analysis and comparison of alternative device architectures at an early stage of the design process. Using Thévenin's theorem, Falnes crafted an ingenious solution for the monochromatic optimal power capture of heaving point absorber devices by forming a mechanical impedance matching problem between the device and the power take-off. However, his solutions are limited by device architecture complexity. In this paper, we use the mechanical circuit framework to extend Falnes' method to form and solve the impedance matching problem and calculate the optimal power capture for converter architectures of arbitrary complexity. The new technique is first applied to reprove Falnes' findings and then to assess a complex converter architecture, proposed by Korde. This work also provides insight into a master-slave relationship between the geometry and power take-off force control problems that are inherent to converter design, and it reveals a hierarchy of distinct design objectives unbeknownst to Korde for his device. Finally, we show how application of the master-slave principle leads to the reduction in the dimensionality of the associated design space.

Suggested Citation

  • Bubbar, K. & Buckham, B. & Wild, P., 2018. "A method for comparing wave energy converter conceptual designs based on potential power capture," Renewable Energy, Elsevier, vol. 115(C), pages 797-807.
    • Handle: RePEc:eee:renene:v:115:y:2018:i:c:p:797-807
    DOI: 10.1016/j.renene.2017.09.005
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    References listed on IDEAS

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    1. Babarit, A., 2015. "A database of capture width ratio of wave energy converters," Renewable Energy, Elsevier, vol. 80(C), pages 610-628.
    2. Markel Penalba & John V. Ringwood, 2016. "A Review of Wave-to-Wire Models for Wave Energy Converters," Energies, MDPI, vol. 9(7), pages 1-45, June.
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    1. 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).
    2. Bonovas, Markos I. & Anagnostopoulos, Ioannis S., 2020. "Modelling of operation and optimum design of a wave power take-off system with energy storage," Renewable Energy, Elsevier, vol. 147(P1), pages 502-514.

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