Influence of adjustable grille device on the stability of floating offshore wind turbine

Abstract

In order to improve the stability and safety of the floating wind turbine in the complex marine environment, an adjustable grille device was proposed. The shaking table test was carried out to verify the feasibility of the grille device. The finite element numerical analysis was used to establish the simulation model of the adjustable grille device and the floating wind turbine, and the dynamic response of the floating wind turbine under different wave conditions was analyzed. The results show that when there is no adjustable grille device, the maximum inclination of the floating wind turbine structure under the heavy wave load is 3.1°. When the grille device is added, under the same wave load, the sloshing amplitude and maximum inclination of the floating wind turbine structure will decrease, and the reduced amplitude is related to the opening angle of the grille plate. At the same time, the natural frequency of the wind turbine structure increases. When the grille plate is opened at 30°, the maximum inclination angle of the structure and the stress of the tower cylinder are reduced by 1.8° and 108.89 MPa, respectively, which indicates that the adjustable grille device can significantly improve the stability and safety of the floating offshore wind turbine.