Research On Variable Speed Variable Propeller Control System Of Wind Turbine Based On ADRC Control

With the increasing penetration of wind energy into the power grid,the influence of wind power systems on the frequency and voltage stability of the power grid is becoming more and more significant.The variable pitch system is a complex nonlinear system that is disturbed by various uncertainties and is a key component of the wind power generation system.When the wind speed exceeds the rated cut-in wind speed,the pitch angle is changed to control the wind power conversion efficiency,thereby obtaining the rated power from the wind and protecting the wind turbine from damage.Therefore,from the perspective of grid integration,the power control technology of wind turbines has become increasingly important.When the wind speed is higher than the rated speed of variable pitch wind turbine,the output power and rotor speed are kept at their rated values by changing the pitch angle.For the wind turbine system with nonlinear and complex structure,the traditional pitch controller is difficult to achieve accurate control.This paper presents an improved pitch controller based on ADRC.A pitch controller is designed based on ADRC algorithm considering various uncertain disturbances and parameter changes of mechanical components in wind turbine.Combined with tracking differentiator,extended state observer(ESO)is used to observe the state and disturbance of the system.In addition,in order to compensate the ADRC,a nonlinear state error feedback control law is designed by configuring the nonlinear structure according to the state deviation between the extended state observer and the tracking differentiator.The simulation results show that the pitch control based on ADRC can effectively estimate the system state and disturbance.The proposed controller has good dynamic performance and strong robustness.First,this article introduces the important position of wind energy in the contemporary world energy structure,the composition and types of wind energy conversion systems and control strategies.Secondly,the wind energy acquisition,the working principle of the wind turbine,and the structure and classification of the wind turbine are explained.Then,the different functional models in the fan pitch control system are mathematically analyzed,the simulation model is built,and then the wind power generation based on the ADRC control is designed.The variable-speed variable-pitch control system is simulated,and finally the above system is verified through the experimental platform.