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Control to structure pathways in the upstream TetraSpar floating wind turbine

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  • Shokati, Moosarreza
  • Lee, Sang

Abstract

Active wake control strategies for floating offshore wind turbines are less well characterized, despite their potential to improve farm-level performance. This study presents an investigation into the local structural and motion response of the single upstream turbine. Fully coupled aero-hydro-servo-elastic simulations of a DTU 10 MW turbine on a TetraSpar floating platform are performed using FAST-to-AQWA coupling under realistic conditions. Two dynamic blade pitch based control strategies are investigated: dynamic induction control (DIC), and dynamic individual-pitch control (DIPC), including 1st and 2nd order schemes. Simulations combine frequency domain diagnostics with time domain load metrics to reveal control-motion-load coupling pathways. DIC imposes axisymmetric, low-frequency thrust oscillations that couple strongly into platform pitch, heave, surge and substantially increase tower base fatigue (up to ≈12%–21%). DIPC reorganizes 1P loading into amplitude modulated sidebands that raise blade root fatigue (up to ≈13%–22%) while reducing tower base fatigue (≈2%); 2nd order DIPC further increases blade root fatigue by ≈1% of 1st order DIPC on average but provides slightly more tower base load relief. These results identify clear, component specific trade-offs, confirming that rigorous upstream structural assessment is essential for deployment feasibility. For the TetraSpar DTU 10 MW system, DIPC is the more balanced option when tower endurance is critical.

Suggested Citation

  • Shokati, Moosarreza & Lee, Sang, 2026. "Control to structure pathways in the upstream TetraSpar floating wind turbine," Renewable Energy, Elsevier, vol. 266(C).
    • Handle: RePEc:eee:renene:v:266:y:2026:i:c:s0960148126004489
    DOI: 10.1016/j.renene.2026.125623
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