Delay Vibration Control Of Wind Turbine Blades

The world wind power industry is developing rapidly.In order to make full use of wind power resources and reduce the kilowatt-hour cost of wind power generation,large-scale and lightweight wind turbines have become an inevitable development trend.This trend makes blade vibration a problem that cannot be ignored.The blade control system usually contains the objective time delay,which affects the transmission of the swing instruction of the pneumatic device,forms the signal delay,thus exacerbates the vibration of the blade,and seriously affects the blade operation safety and power generation efficiency.However,there are few researches on the delay compensation of wind turbine blade vibration control system.Therefore,the study of delay vibration control of wind turbine blades is of great significance.In this paper,based on MATLAB platform,using Simulink modeling method,innovative design of the improved time delay compensation controller and the improved gray Wolf optimization algorithm,in a variety of time delay conditions,studied the delay vibration control of two types of wind turbine airfoil blades,and conducted effectiveness verification.The main research work and achievements of this paper are as follows:(1)Firstly,the vibration model of wind turbine blade under ideal condition is established.Considering the variability of aerodynamic data on blades in reality,the wind tunnel aerodynamic experimental data of the two types of airfoils are expanded by using mathematical formulas,and the expanded experimental data are replaced into the established model by using the module Lookup Table,so that the aerodynamic parameters modeled are more accurate and scientific,and the vibration of blades can be truly simulated.Ensure the reliability of design controller in practical engineering.(2)Innovatively put forward the improved Smith prediction theory.Abstract:The blade time-delay vibration control system is characterized by uncertain hour-delay,sensitive system parameters,and fast change of aeroelastic characteristics.Traditional PID and traditional Smith-PID controllers are designed,and an innovative Smith controller based on second-order robust filtering(improved Smith-PID)is designed.The core idea is to add a second-order robust filter at a specific position on the basis of the traditional Smith estimator.The stability proof and simulation tests show that the controller effectively overcomes the mismatch of the traditional Smith model in the blade delay vibration control system,and has strong delay compensation and vibration reduction capabilities.(3)The theory of bidirectional random gray Wolf optimization algorithm is innovatively proposed.Aiming at the difficulty of parameter setting of the designed time-delay compensation controller,this paper improved the traditional grey Wolf optimization algorithm and innovatively designed the two-way random grey Wolf optimization algorithm for the first time.The core idea is to introduce hunting strategy factor,and adopt bidirectional random mechanism based on hunting strategy factor vector and coefficient vector to improve the hunting way of grey wolves.Through the performance evaluation of the objective function,the innovative bidirectional random gray Wolf optimization algorithm proposed in this paper is superior to other traditional intelligent algorithms.It has the advantages of improving the ability of global search and local search and avoiding falling into the local optimal prematurely.(4)Under the conditions of 15m/s wind speed and a variety of time delays,through the control test,the conclusion is drawn:In the classical symmetrical NACA0018 airfoil vibration control system,the control effect of the improved Smith-PID controller based on BRGWO algorithm can be achieved under the condition of 0.01s delay.Compared with conventional PID,conventional Smith-PID and improved Smith-PID controllers based on GWO algorithm,the amplitude of flap-wave displacement and torsion Angle are improved by 64.9%,40.9%and 25.8%on average.Under the condition of 0.02s delay,the average improvement is 62.2%,41.9%and 26.9%,respectively.Under the condition of 0.05s delay,the average improvement is 53.9%,25%and 11%,respectively.In the vibration control system of asymmetric NACA64-618 tip airfoil blades with time delay,the control effect of the improved Smith-PID controller based on BRGWO algorithm is improved by 14%,8.1%and 3.1%,respectively,under the condition of time delay of 0.01s.Under the condition of 0.02s delay,the average improvement is 12.7%,7.6%and 1.4%,respectively.Under the condition of 0.05s delay,the average improvement is 19.3%,11.5%and 8,7%,respectively.