Dynamic analysis of 10 MW monopile supported offshore wind turbine based on fully coupled model. (15th August 2021)

• Record Type: Journal Article
• Authors: Xi, Renqiang; Du, Xiuli; Wang, Piguang; Xu, Chengshun; Zhai, Endi; Wang, Suyu
• Is Part Of: Ocean engineering. Volume 234(2021)
• Publication Date: 2021-08-15
• Subjects: Dynamic response analysis -- 10 MW offshore Wind turbine -- Fully coupled model -- Controller -- Soil-structure interaction; Ocean engineering -- Periodicals; Ocean engineering; Periodicals; 620.4162
• DOI: 10.1016/j.oceaneng.2021.109346
• Languages: English
• ISSNs: 0029-8018

Abstract

Abstract: In this study, the monopile of a 10 MW offshore wind turbine (OWT) is designed for a specific ocean site, and a new soil-structure interaction (SSI) framework is developed for the aero-servo-hydro-elastic code FAST. Taking the DTU 10 MW OWT as the prototype, a Bladed-style controller is developed to regulate the rotor speed and blade-pitch angle, and its performance is evaluated by comparisons with the DTU original controller. Subsequently, an SSI analysis model is established for FAST using the nonlinear Winkler foundation model, and this module is verified by the analysis results obtained from GL-Bladed software. In addition, the monopile of this 10 MW OWT is designed for layered sand adopting the metocean data from the North Sea. The soft-stiff design philosophy is used in this task, and the 1st-order natural frequency of the system is 0.22 Hz lying in the middle of 1P and 3P frequency bands of OWT. Besides, the dynamic response and fatigue damage of this 10 MW monopile supported OWT are investigated using the fully coupled model. The results show that SSI effect and time-variant blade-pitch angle significantly influence the dynamic response of OWT and fatigue life of the monopile. Highlights: A robust controller is designed to regulate the rotor speed and blade-pitch angle. A reliable soil-structure interaction framework is developed for the FAST code. Monopile of 10 MW OWT is designed for layered sand with measured metocean data. Dynamic response and fatigue damage of OWT are investigated using fully coupled model.