Aerodynamic Coefficient Of Wave Motion Response Of Floating Wind Turbine

As the problems caused by traditional fossil energy become more and more serious,people are now beginning to vigorously develop clean and renewable energy.Wind energy is a kind of renewable and pollution-free energy.In recent years,people have paid more and more attention.With the gradual development and utilization of high-quality land-based wind energy resources,people have begun to turn their attention to the ocean with a wider area and richer resources.Because floating wind turbines have the advantages of stable operation,high power generation efficiency,large installed capacity,and high power utilization hours,they have attracted widespread attention from experts and scholars from all over the world.The first-order and second-order hydrodynamic forces of offshore floating structures are usually expressed in the form of hydrodynamic derivatives,while the aerodynamic forces of wind turbines are calculated using BEM theory.There is a strong coupling relationship between the aerodynamic load of floating wind turbines and the movement of wind turbines,which is difficult Expressed in the form of hydrodynamic derivative,therefore,the wave motion response analysis of floating wind turbines needs to adopt a time-domain coupling method,and the calculation time is relatively long.Based on the Ministry of Industry and Information Technology’s special project "Development of offshore floating wind power equipment",this thesis carried out a numerical simulation study of the coupled motion response of floating wind turbines in waves.The research found that: under certain typical conditions,wind aerodynamics There is a quasi-linear correlation between the load and the motion response speed.The least square method can be used to obtain the aerodynamic coefficient of the wind turbine motion response,which makes it possible to analyze the coupled motion of the frequency domain algorithm in the wave.The thesis is based on the integrated research project of floating wind turbines of China Shipbuilding Industry Corporation Haizhuang Wind Power Co.,Ltd.,and based on the fixed wind turbine parameters provided by Haizhuang Wind Power,numerical modeling is carried out in the FAST software,and the calculation is carried out.The results are compared with the calculation results of the Bladed software of Haizhuang Wind Power,and the two are in good agreement,which verifies the accuracy of the modeling work of the thesis.The thesis takes OC3 Hywind-NREL 5MW as the research object,and establishes the calculation model of floating wind turbine,floating platform,and mooring system in FAST software.According to certain specific working conditions under uniform flow and shear flow,the floating wind turbine,floating platform,and mooring system are established in FAST software.The coupled motion of the floating wind turbine is simplified,and the relationship between the motion response amplitude,wind turbine load,energy utilization and wave height,wave period,and impeller speed when the floating wind turbine is moving in a single degree of freedom is established.The aerodynamic coefficient of wind turbine motion response is obtained by multiplication,and the law of the aerodynamic coefficient changing with wave parameters is analyzed.The research work in this paper is expected to greatly improve the efficiency of the coupled motion response analysis of floating wind turbines in waves.It theoretically supported the research work of the "The Research of Offshore Floating Wind Power Equipment " project.