Investigation Of Foundation Hydrodynamic Response Of TLP Wind Turbine In The South China Sea

Wind energy is an important part of the renewable energy sources,so development of wind energy has great significance to solve the energy crisis and to protect the environment.Offshore wind power will occupy an important position in the future development of wind power because of its unique advantages.With the development of offshore wind energy moving to deepwater,floating foundation will play a more important role in the future.Since floating foundation supports the wind turbine,it should have a sound dynamic response in order to ensure efficient power generation.Marine environment conditions are very complex.Accurate simulation of the environment loads and the motion characteristic of the floating foundation should be paid more attention when designing the structures.In addition,for some special foundation types(such as TLP),the effects of the second-order wave force and its impact on the fatigue life of the tendon are also the hot and difficult problems to be solved.To solve the problems above,the main work is presented as follows:(1)Based on the 5MW wind turbine of NREL,a type of TLP floating foundation for offshore wind turbine is designed in concept.The minimum diameter of the tendon is determined given that the foundation structure has adequate fatigue life.(2)The aerodynamic load is calculated with the blade-element method and the hydrodynamic load is calculated with the potential theory and Morison equation.In addition,the second-order wave force is calculated with QTF.(3)The dynamic response of the system is studied under the joint effect of wind,wave and current,and the effects of the aerodynamic load and the second-order wave force are studied,both in the frequency and time domain.(4)Based on the previous analysis,the fatigue life of the tendon is estimated and the effects of the wave parameters and the second-order wave force to the fatigue life are studied.