Aero-hydro-mooring Coupled Analysis Of Novel Concept Of Spar Floating Offshore Wind Turbine

In order to realize the sustainable development of human society,the world have set their sights on the field of renewable energy.Wind energy is one of the most promising new energy sources among the mainstream renewable energy.Today,the use of wind energy is still dominated by onshore wind power,but offshore wind power has the advantages of not occupying land resources,huge reserves,convenient power transmission,and not affecting the living environment,and its advantages are more obvious as it is farther offshore.However,with the increase of offshore distance and water depth,the cost and difficulty of construction and installation of traditional fixed offshore wind turbines have soared.In this case,the floating wind turbine has emerged.The development of offshore floating wind turbine is a necessary step in the development of renewable energy.It is receiving more and more attention and has become a research hotspot in the energy field.This paper takes a novel concept of spar floating offshore wind turbine as the research object.Its dynamic characteristics are analyzed through aero-hydro-mooring coupled numerical simulation.The research contents are as follows:Firstly,the frequency domain hydrodynamic model of the novel concept of spar floating platform is established through ANSYS AQWA,and the hydrodynamic data of additional mass,radiation damping,first-order wave force and RAO are calculated.Its RAO is compared with the RAO of traditional spar floating platform,and the results show that the hydrodynamic performance,especially in the heave and pitch directions of the novel concept of spar floating platform is good.After that,the aero-hydro-mooring coupled time-domain analysis model of the novel concept of spar floating offshore wind turbine is established by FAST and OrcaFlex.The natural frequencies are calculated by decay motion.The six-degree-of-freedom motion response,nacelle acceleration response,mooring line tension response and load response in tower bottom and blade root under normal and severe conditions are calculated by the time-domain numerical simulation of the floating wind turbine.The law between wind and wave conditions and the dynamic response of the wind turbine is summarized based on the time domain and frequency domain analysis.The results show that the dynamic response of the novel concept of spar floating wind turbine is within a reasonable range,the power output is normal,and the safety requirements are met with good performance.Finally,the influence of the main structure size parameters of the novel concept of spar floating platform on its motion characteristics is analyzed.The results show that the sizes of the hull column are closely related to the motion performance.The relevant laws are briefly summarized,which provides references for the design of the novel concept of spar floating platform.