Research On ADRC Independent Pitch Control Based On Intelligent Algorithm

Because of its non-renewability and environmental pollution,all countries are committed to the development of renewable energy.Green and environmentally friendly wind power is currently the most mature technology in the use of renewable energy,and it is one of the most promising clean energy sources in the 21 st century.With the increasing installed capacity of wind turbines,the structure of wind turbines has become more and more complex.When the length of the blades and the height of the hub become higher and higher,wind shear,tower shadow and turbulence effects will load wind turbine blades and other parts.The impact is also growing.Aiming at the problem of poor power stability and unbalanced load when large wind turbines are connected to the grid,this subject combines unified pitch and independent pitch,and proposes an ADRC independent pitch control based on intelligent algorithms.The main tasks are as follows :(1)Consult a large number of documents,understand the background and current situation of wind power generation,introduce the advantages and disadvantages of the existing pitch technology and the problems faced by pitch control,and clarify the significance of the subject research.(2)The composition of wind turbines and the structure and principle of pitch control are introduced.According to the aerodynamic principles of wind turbines,a calculation model of wind turbine blade load based on Matlab is established.(3)The wind speed model and the mathematical model of each part of the wind turbine are established,and the unified pitch control strategy based on PID is proposed and simulated.The simulation results show that the traditional PID uniform pitch control can make the wind turbine power stable but fluctuate greatly.(4)The basic principle of the azimuth weight coefficient is introduced,and the PID-based independent variable pitch control strategy of the azimuth weight coefficient is established and simulated in combination with the principle of unified pitch.In order to further reduce the unbalanced load of wind turbines and reduce the problem of large fluctuations in the power of wind turbines controlled by PID,an independent pitch control strategy based on active disturbance rejection is proposed.The simulation results show that the independent pitch control based on active disturbance rejection is better in reducing wind turbine load and stabilizing power.(5)The intelligent algorithm is introduced to solve the problem that the ADRC controller has many parameters and the adjustment is difficult,and the improved dragonfly algorithm is used to realize the self-tuning of ADRC parameters,and the auto disturbance rejection controller adjusted by the improved dragonfly algorithm is applied to wind power The unit is in an independent pitch system.The simulation results show that the independent pitch control strategy based on improved active disturbance rejection has better load reduction effect,and the power of wind turbines is more stable.