Research On Vibration Control Strategy Of Wind Turbine Blades

With the continuous development of modern industry and the increasing energy consumption,the renewable energy represented by wind and solar energy will maintain stable growth in the long term.Wind turbines are devices that collect wind energy and generate electricity,blades are the core components.Unpredictable vibration will occur when blades which have high flexibility due to the influence of wind,blade weight,centrifugal force,bending moment and environmental factors,resulting in damage and failure of the blade structure,affecting the normal operation of generating units.Vibration can be effectively suppressed by various passive,active and active-passive hybrid actuators.In this study,piezoelectric plates are used as sensors and actuators,and the active,passive and active mixed vibration control strategies of blade vibration are studied by combining damping plates.Firstly,the aerodynamic theory of wind turbine blades is described,including the brake disc model,the influence of Bates limit,wake effect and leaf momentum theory.The coordinate system of the wind turbine is established and the blade of dynamic equation is derived based on the Hamilton principle,the wind turbine blade are designed and optimized,and the vibration equation of the blade was derived based on the Euler-Bernoulli theory.Then COMSOL was used for finite element analysis of the blade to study the vibration characteristics of the blade under its designed wind speed.Based on the above analysis results,seven different vibration control scheme is designed,and by using the method of numerical simulation for the respective suppression efficiency are analyzed.the results show that the vibration of the main central control node distribution in leaf area,and the main passive hybrid vibration control system of vibration suppression effect is superior to pure active and passive vibration control.Finally,an experimental platform for blade vibration analysis is designed and built.The passive vibration control experiment is taken as the focus to compare the three passive vibration suppression schemes and the vibration suppression effect of non-vibration control under different wind speeds.The simulation results show that the three vibration control modes have obvious suppression effects on the vibration of the blade.The vibration suppression rates of the three passive control schemes are 24.274%,22.039%and 43.077%,respectively.The rates of two active-passive hybrid control schemes are 35.294%and 30.769%.The rates of two active-passive hybrid control schemes are 74.354%and 69.812%.It can explain the active-passive hybrid control scheme is superior to the pure active and passive control schemes.The vibration suppression rate of the control scheme 1 is better than the scheme 2,and the vibration suppression rate of the scheme 4 is better than the scheme 5,it indicates that the vibration suppression effect of the first-order mode is better than the second-order mode.This results obtained by the experiment show that the vibration inhibition rate of the control scheme 1 is higher than that of the scheme 2,and the simulation results are verified.The research,the vibration control strategy of wind turbine blades,provides reference value for the vibration suppression of other complex structures.