Soft Power Limitation Control for Floating Offshore Wind Turbines

Kwansoo Kim (), Hyun-Gyu Kim, Joong-Hyeok Lee and Jaehoon Son
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Kwansoo Kim: Center for Green Systems Integration, Institute for Advanced Engineering, Yong-in 17180, Republic of Korea
Hyun-Gyu Kim: Center for Green Systems Integration, Institute for Advanced Engineering, Yong-in 17180, Republic of Korea
Joong-Hyeok Lee: Center for Green Systems Integration, Institute for Advanced Engineering, Yong-in 17180, Republic of Korea
Jaehoon Son: Center for Green Systems Integration, Institute for Advanced Engineering, Yong-in 17180, Republic of Korea

Energies, 2025, vol. 18, issue 21, 1-21

Abstract: Floating offshore wind turbines (FOWTs) face significant challenges in maintaining reliable power generation while mitigating structural loads, which are critical for reducing maintenance costs and extending service life. To address these issues, this study evaluates the effectiveness of a Soft Power Limitation Control (SPLC) strategy through numerical simulations in DNV Bladed. Two representative design load cases were considered, with design load case (DLC) 1.1 representing normal turbulence and DLC 2.3 representing an extreme operating gust. Under DLC 1.1, SPLC substantially reduced tower fatigue loads, lowering the damage equivalent loads (DELs) of side-to-side and fore–aft bending moments by 21 percent and 15.2 percent, respectively, while blade and mooring loads remained nearly unchanged. Platform motions exhibited modest improvements, including a 6.5 percent reduction in surge peak-to-peak, 2.2 percent in surge RMS, and 2.6 percent in pitch peak-to-peak. Under DLC 2.3, SPLC effectively alleviated extreme responses, decreasing the maximum tower side-to-side bending moment by 30.7 percent and the blade flap-wise bending moment by 15.6 percent, without adverse effects on six-degrees-of-freedom (6-DOFs) platform motions. Overall, the results confirm that SPLC enhances both fatigue and extreme load performance while maintaining stability, highlighting its potential as a practical and cost-effective control strategy to improve the reliability, durability, and commercial viability of FOWTs.

Keywords: soft power limitation control; floating offshore wind turbine; feedback control algorithm; structural load reduction (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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