Rigid-flexible Coupling Dynamic Simulation Of Floating Vertical Wind Turbine System Based On Kane Method

In the complex working environment,floating wind turbines will be affected by wind,wave,flow and other forces.As for large wind turbines,The flexible deformation of the blade and tower column cannot be ignored.Therefore,the conventional analysis method of considering the wind turbine as one or more rigid bodies needs to be further improved.5MW floating VAWT(vertical axis wind turbine)with ??type Darrieus rotorwerestudied in this paper.The surge,heave,pitch motion of floating foundation is considered,and the flexible deformation of tower column and blade is considered.The coupling dynamic equation of the system was established based on Kane method,and a program was written to solve the system motion.The mixed coordinate method is selected to describe the motion of rigid body and flexible body.Modal expansion and finite element method are used to discretize the tower column and blade respectively.The deformation of the flexible beam is described according to the theory of continuous medium mechanics.The upper rotor structure is designed for the 5MW floating Darrieuswind turbine system,and the rotor is aerodynamic designed.The related aerodynamic parameters and rotate speed control scheme of the wind turbine are given.The material and structure of the blade are designed,and the strength of each component is preliminarily checked.The dynamic response of the wind turbine system under different load conditions is calculated and the influence of different control parameters on structural motion is studied.The results show that the aerodynamic load at high frequency has little effect on the low frequency motion of the floating foundation.The bending deformation of the tower in both directions is coupled to each other.The vibrations of the column and the blade pass through each other.In the response frequency of blade,the coupling between wave frequency and 1P frequency is significant,while in the response frequency of tower column,the coupling between wave frequency and 2P frequency is significant.