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Wave-to-wire modelling and hydraulic PTO optimization of a dense point absorber WEC array

Author

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  • Asiikkis, Andreas T.
  • Grigoriadis, Dimokratis G.E.
  • Vakis, Antonis I.

Abstract

We investigate the hydrodynamic interactions and power extraction efficiency of a dense array of Point Absorber (PA) Wave Energy Converters (WECs) clustered around the fixed pillar of a wind turbine –the Ocean Grazer device– with a standard hydraulic Power Take-Off (PTO) system. Using potential flow theory, a detailed wave-to-wire model is developed in WEC-Sim with four distinct hydraulic PTO designs: i) Multi PTO-with individual hydraulic PTO systems for each buoy, ii) Shared PTO V1-with a unified PTO system for the entire array, iii) Shared PTO V2-with the accumulator volume split into two segments, and iv) Shared PTO V3-with four strategically distributed segments. Key parameters such as the diameter of the hydraulic pistons, volume and pre-charged pressure of the high-pressure accumulators, hydraulic motor displacement and the speed of the electric generator are optimized with a genetic algorithm and a parametric analysis across various sea states. The results highlight that strategically allocating the accumulators across the floaters of a dense WEC array can yield significantly higher power production and should be considered at the early design stages.

Suggested Citation

  • Asiikkis, Andreas T. & Grigoriadis, Dimokratis G.E. & Vakis, Antonis I., 2024. "Wave-to-wire modelling and hydraulic PTO optimization of a dense point absorber WEC array," Renewable Energy, Elsevier, vol. 237(PA).
    • Handle: RePEc:eee:renene:v:237:y:2024:i:pa:s0960148124016884
    DOI: 10.1016/j.renene.2024.121620
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