The Conceptual Design And Research Of Semisubmersible Offshore Floating Wind Turbine Platform

With global warming and the depletion of traditional fossil fuels,wordwide countries are seeking sustainable clean renewable energy.Offshore wind energy,as an important part of offshore renewable energy,has the advantages of high wind speed,small turbulence and stable wind direction.Development of offshore wind farms currently being built in China are mainly offshore fixed-base wind turbines.However,the offshore areas suitable for offshore wind power development are limited in China.In order to use offshore wind energy more effectively in the future,we should promote national energy transformation and deal with climate change.The trend of China's offshore wind power toward the deep sea is inevitable.This paper takes the national wind power wind power industry development and the promotion of energy consumption revolution as the background.Based on the aerodynamics and hydrodynamic theory in the actual sea area of the East China Sea region,a method combining theoretical derivation,base design and numerical simulation is proposed.A type of semi-submersible floating wind turbine suitable for deep-sea wind energy development in the East China Sea is proposed.Firstly,based on the basic principles of floating platform design and the target sea area environmental conditions,a semi-submersible floating wind turbine foundation suitable for the deep sea area of southeast China was designed.Then based on the theory of three-dimensional potential flow theroy,the hydrodynamic characteristics of the semisubmersible floating wind turbine foundation in the regular wave are analyzed in the frequency domain,and the hydrodynamic software AQWA is quadratic based on the numerical simulation of turbulent wind.Developed to load real-time changing wind wheel loads on the basis of timedomain coupling calculations.Based on this,based on the catenary theory,a composite mooring system with elastic cables was designed.Finally,two different anchorage design schemes were designed for semi-submersible floating wind turbines.The platform displacements and mooring line tensions under design and survival conditions were compared and analyzed,and the ultimate survival conditions were compared.The next floating wind turbine was checked and the check results showed that the combined mooring system design can effictively reduce the tension of the mooring line and reduce the fatigue of the anchor chain on the basis of meeting the positioning requirements.This paper can provide reference for the prediction of base motion of semi-submersible floating wind turbines and the design of combined mooring system,and provides some ideas for the development of deep-sea floating wind farms in East China Sea.