Dynamic Response Of A 10 MW Spar-Type Wind Turbine And Research On Prediction Of Tower Vibration Response

With the gradual deepening of the wind power industry,wind turbines toward the trend of "from land to sea,from shallow water to deep water,from fixed foundation to floating foundation,from low power to high power".Large-scale offshore floating wind turbines withstand a wide range of loads,therefore the force and kinematic response are not the multiplication of small wind turbines,but a qualitative change.This paper calculates the dynamic response of a 10 MW SPAR-type wind turbine using numerical analysis to analyze the performance of the research object under different sea conditions.Compared with 5 MW SPAR-type wind turbine,which has been studied extensively,some advantages and problems are concluded.In addition,this paper takes the tower of a floating wind turbine as the research object,Bernoulli-Euler beam with variable axial forces and variable sections are modeled to give the general method of the natural frequencies and modal analytic solution of the transverse vibration of the tower of the floating wind turbine.The main work of this paper is summarized as follows:1.The research background of wind power and high power floating wind turbine is introduced in detail,and the related research methods and research status of this subject are summarized.2.The DTU 10 MW reference wind turbine and SPAR-type floating foundation are introduced in detail,and the main parameters of each structural module are given.The hydrodynamic coefficients of the SPAR are calculated by using the frequency-domain potential theory.The first-order wave excitation force,additional mass and potential flow damping are used to analyze the hydrodynamic performance primarily.3.Using FAST code,the dynamic response of a 10-MW SPAR-type floating wind turbine is calculated considering various environmental conditions,and the dynamic response characteristics in frequency domain is obtained by applying the Fourier transform method.4.Compared with the response of the 5 MW SPAR-type floating wind turbine under the typical load conditions,the optimization direction of a 10 MW-level offshore floating wind turbine is summarized.5.The semi-analytical solution of transverse vibration of the tower of a single-column floating-type wind turbine is derived by using the characteristic equation of transverse motion of Bernoulli-Euler beam with variable-axial forces and variable section under uniform boundary conditions.Based on this method,the MATLAB mathematic tool is used to develop the calculation program of the free vibration of the tower.