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Experimental and numerical analysis of power take-off control effects on the dynamic performance of a floating wind-wave combined system

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  • Chen, Zheng
  • Sun, Jili
  • Yang, Jingqing
  • Sun, Yong
  • Chen, Qian
  • Zhao, Hongyang
  • Qian, Peng
  • Si, Yulin
  • Zhang, Dahai

Abstract

The integration of wave energy converters (WEC) into floating offshore wind turbines (FOWT) is regarded as a promising approach for comprehensively harnessing deep-sea energy and reducing the levelized cost of energy. This study aims to investigate the WEC power take-off (PTO) control effects on the dynamic performance of a floating wind-wave combined system, wherein three heaving-type WECs are integrated into a semi-submersible FOWT. In particular, the hydraulic PTO is modelled as a Coulomb damping system to enable a more realistic analysis. The aero-hydro-servo-elastic-mooring coupled numerical simulations and 1:50 wave basin experimental data demonstrate good agreement. It is observed that wave power production varies significantly with different control settings, potentially reaching 24.0 % of the overall hybrid energy production with proper control parameters. Furthermore, platform pitch oscillation generally shows a decreasing trend with increasing damping forces under below-rated and rated conditions, while showing minimal influence when above-rated. Conversely, tower base damage equivalent load (DEL) tends to initially decrease and subsequently increase across all examined conditions. This consistent convexity indicates the potential use of DEL as a performance index for optimising PTO control. In summary, power increment, motion reduction, and load mitigation could be achieved concurrently with appropriate control design. For instance, an extra 0.48 MW wave power could be produced under the rated condition, while a 10.4 % reduction in tower base DEL and a 6.57 % mitigation in platform pitch oscillation could also be achieved at the same time.

Suggested Citation

  • Chen, Zheng & Sun, Jili & Yang, Jingqing & Sun, Yong & Chen, Qian & Zhao, Hongyang & Qian, Peng & Si, Yulin & Zhang, Dahai, 2024. "Experimental and numerical analysis of power take-off control effects on the dynamic performance of a floating wind-wave combined system," Renewable Energy, Elsevier, vol. 226(C).
    • Handle: RePEc:eee:renene:v:226:y:2024:i:c:s096014812400418x
    DOI: 10.1016/j.renene.2024.120353
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