Aeroelastic Modeling And Vibration Control Of Wind Turbine Blades Based On Aerodynamic Analysis

With the continuous development of wind turbine technology and the increasing demand forclean energy,the protection and control of wind turbine blades has attracted more and more attention of researchers in the field.As a flexible body,wind turbine blades are mostly made of composite materials,which have low stiffness and show the dynamic characteristics of elastomers under the action of wind.The establishment of the mathematical model of wind turbine blade under wind load is particularly critical,especially for the expression of the force,which is related to whether the model can accurately and reasonably simulate the aeroelastic vibration of the blade under wind load.In this paper,a variety of aeroelastic models and aerodynamic expressions are selected to study aeroelastic stability of blades under aerodynamic loads from different angles.The ONERA model under the action of blade non-linear aerodynamic force after a small range of linear approximation is included.This model has a good effect on Simulation and prediction of two-dimensional cross-section vibration.In the aspect of control mode selection,the optimal PID control,model predictive control,sliding mode variable structure control and GAPID control are selected to control aeroelastic vibration of blades.After control,the aeroelastic vibration of the blade is greatly reduced,and the vibration can be attenuated in a relatively short time.The control effect is good.The physical realization of control mode includes electronic propeller,hydraulic propeller and skin built-in actuator.As for the linkage of aeroelastic models,accurate mathematical models of actuators can be constructed and controlled in parallel.In this paper,CFD analysis and research of blade trailing edge flaps are carried out from a three-dimensional perspective.The selected GURNEY fixed flaps have good lift characteristics and can reduce blade vibration when considering aerodynamic damping.In this method,the cross section analysis of two-dimensional airfoil and three-dimensional aerodynamic simulation are combined to simulate the aeroelastic behavior of blades in three-dimensional space more accurately and practically.