Modelling of a wave energy converter array with a nonlinear power take-off system in the frequency domain

Yanji Wei, Alva Bechlenberg, Marijn van Rooij, Bayu Jayawardhana, Antonis I. Vakis

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9 Citations (Scopus)
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Abstract

This paper presents a nonlinear frequency domain model and uses this to assess the performance of a wave energy converter (WEC) array with a nonlinear power take-off (PTO). In this model, the nonlinear PTO forces are approximated by a truncated Fourier series, while the dynamics of the WEC array are described by a set of linear motion equations in the frequency domain, and the hydrodynamic coefficients are obtained with the boundary element method. A single heave absorber is firstly investigated to establish the accuracy of the new model in capturing the nonlinear behavior of the pumping system. Subsequently, simulations of a 2D array with 18 WECs and a pillar in the center (representing the tower of a wind turbine) are carried out to understand wave interference effects. Several optimization strategies are proposed to improve the overall performance of the WEC array. These results demonstrate a computationally effective method for accounting for nonlinear effects in large WEC arrays. The proposed approach may potentially be applied for developing control algorithms for the adaptability of a 2D array to incoming wave excitation.
Original languageEnglish
Article number101824
Number of pages11
JournalApplied Ocean Research
Volume90
Early online date21-Jun-2019
DOIs
Publication statusPublished - Sep-2019

Keywords

  • POINT ABSORBER
  • ABSORPTION
  • OPTIMIZATION
  • PERFORMANCE
  • EXTRACTION
  • CAPTURE
  • DESIGN
  • IMPACT

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