Numerical Simulation Of Fatigue Loads And Vibration Control Of Wind Turbines Operating In Wakes

With the increasing depletion of fossil fuels and the gradual deterioration of the global environment,wind energy has been widely concerned.For the characteristics of high efficiency and cleanness,it has been greatly developed in recent years,and its size has gradually increased,which cause the wake effect more and more significant.However,the wake effect of wind turbine seriously restricts the characteristics of the downstream wind turbine,which result in the reduction of power generation and the increase of fatigue load.Therefore,it is of great significance to carry out numerical simulation of fatigue loads and vibration control of wind turbines operating in wakes on the layout optimization of wind farms.There are only few researches on this aspect now,and there are many drawback of those researches,such as the inaccuracy of wake flow,the limitation of wind induced response analysis program,and the large mass and space of tuned mass damper.In this paper,the method of ALM is used to simulate of the wake flow of the wind turbine,so as to obtain the data of the wake flow field.Then,according to the generalized coordinate theory,the program of AOWT is compiled with C++ language,to realize the wind induced response analysis of the whole onshore wind turbine,which can read arbitrary wind field and consider the coupling structure system of the rotating blade and the tower body.Then,the characteristics of the equivalent fatigue load of the downstream wind turbine under different conditions of the wake field are compared and analyzed;At last,TMD and TIDTMD dampers are used to control the vibration of the downstream wind turbine.The numerical simulation results of the wake flow field agree with the experimental data,which verifies the reliability of the wake flow.The calculation results of the selfprogramming AOWT are consistent with the commercial program GH Bladed,which verifies the reliability of the program.The wake effect causes the fatigue load of the downstream wind turbine to increase.When the wind turbine is arranged in staggered way,the spatial difference of the wake flow field is the main factor for the increase of the fatigue load.The TMD damper can greatly reduce the fatigue load of the downstream wind turbine.Without changing the total mass of the damper,the RIDTMD damper composed of rotating inertia mass is used to improve the original TMD damper,which further reduces the fatigue load of the downstream wind turbine.