Simulation Analysis And Control Optimization Of Electric Hoist For Wind Power Drive System

With the proportion of clean energy in the energy system increasing year by year,wind power,as a very important part of clean energy,has also achieved significant growth in demand.At the same time,the demand for auxiliary equipment in wind power has also increased dramatically.The electric hoist for wind power is used as the equipment for lifting wind power maintenance tools and parts.The performance requirements of the hoist in the wind power scene are different from those of the traditional electric hoist.The working scene of the electric hoist for wind power is usually a field wind farm.The wind force often reaches level 7 to 8,and the working environment is bad.At the same time,the lifting height is usually as high as 100 meters.Therefore,the research on high intensity,The electric hoist with high stability for wind power is of great significance.This paper aims at improving the strength and stability of electric hoist for wind power,and studies and optimizes the transmission system of electric hoist for wind power.The specific research contents are as follows:1.The contact model of the circular chain drive system of wind turbine hoist based on Hertz contact theory is created,the calculation formula of the contact force between links and chain sprockets is obtained,and the maximum contact stress and stress distribution law between links and chain sprockets are solved,which provides a theoretical basis for checking the finite element simulation results;The kinematics and multi-body dynamics model of the wind turbine hoist is created,and the fluctuation law of speed and acceleration in the circular chain drive is obtained,which provides a theoretical basis for checking the multi-body dynamics simulation results.2.Based on virtual prototype technology,the multi-body dynamic simulation model of electric hoist for wind power is built;The dynamic simulation of the circular chain drive system of the wind turbine hoist is carried out to obtain the indirect contact force curve between the links,between the links and the chain wheel,as well as the speed and acceleration curve of the links during the transmission process,which is used as the basis for the finite element simulation and fatigue life simulation;Based on the results of multi-body dynamics simulation,the tensile breaking test is carried out on the circular link chain to check the reliability of the strength of the circular link chain.3.The finite element simulation model of the circular chain drive system of the wind turbine hoist is built according to the state of the inclined chain in the wind power scene.The static simulation analysis of the circular chain drive system is carried out according to the multi-body dynamics simulation results,and the performance test of the strength and stiffness of the circular chain drive system is completed;The simulation results are compared with the contact model to verify the rationality of the simulation results;By analyzing the simulation results of the circular chain drive system with different tilt angles,it is concluded that the maximum contact stress of the circular chain drive system will increase with the increase of the chain tilt angle in the wind power scenario.4.The material S-N curve of the circular chain drive system is fitted by the nominal stress method,and the fatigue life of the circular chain drive system is simulated and analyzed based on the multi-body dynamics simulation results.The fatigue life of the circular chain drive structure is obtained.The reliability of the fatigue life of the circular chain drive system is verified according to the mechanism work level verification table.5.Based on the results of fatigue life simulation and finite element simulation,combined with the approximate model of radial basis function and the multi-objective genetic algorithm NSGA-Ⅱ,the structure of the ring sprocket was optimized.While meeting the strength and rigidity requirements of the ring sprocket,the weight of the ring sprocket is reduced by 26.1%.6.Based on the analysis of the simulation results of the drive system of the wind turbine hoist and the actual working environment of the wind turbine hoist,a method of optimizing the operation stability of the wind turbine hoist based on the fuzzy control theory is proposed,and a two-dimensional fuzzy controller suitable for the wind turbine hoist is designed.The control effect of the fuzzy controller and the traditional PID controller is compared through Simulink simulation,The advantages of fuzzy controller over traditional PID controller are proved.