Research On Structure Analysis And Control Performance Of Special Lifting Devices For Wind Turbine Hub And Nacelle

The hub and nacelle are both important parts of the wind turbine,because in the lifting process,the hub and nacelle are interfered by the wind and other factors,and the nacelle is required to be in a horizontal position when it is installed at the top of the tower,so the lifting of the hub and the nacelle has always been a technical problem in the lifting process of the wind turbine.In recent years,with the depletion of non-renewable energy,countries in the world pay more and more attention to the use of wind energy,which is a renewable energy,and put forward higher requirements for hoisting technology.In order to meet this requirement,it is an imperative step to develop a kind of special lifting devices for hub and nacelle with strong versatility and highly automatic control.At first,this thesis researches and analyzes the mechanical structure of all kinds of special lifting devices for hub and nacelle at home and abroad,and design the important components of the special lifting devices for hub and nacelle in detail.And in this thesis,a finite element analysis model of the special lifting devices for the wind turbine hub and nacelle is established,and the static analysis of the special lifting devices for the wind turbine hub and nacelle and the fatigue analysis of the key components of the special lifting devices are carried out.According to the results of static analysis,the rationality of the design of the special spreader is verified.According to the results of fatigue analysis,the dangerous parts should be inspected regularly,to reduce the probability of dangerous situation in the hoisting process caused by fatigue damage of components,which lays the foundation for future maintenance and optimization.Then,according to the actual needs of the project,this thesis has designed the hydraulic system of the special spreader,calculated the main parameters of the hydraulic system,select the main hydraulic system components.In order to research the control performance of the special lifting devices for the wind turbine hub and nacelle,this thesis establishes the mathematical model of each part according to the characteristics of each part of the electro-hydraulic servo system,and analyzes the electro-hydraulic servo system in response performance and stability performance by the simulation software.At last,this thesis optimizes the control method of the special lifting devices for the wind turbine hub and nacelle electro-hydraulic servo system,which is different from the present situation that the special lifting devices for the wind turbine hub and nacelle depends on the remote control of the operator.Two control methods are used in the thesis,PID control and single neuron PID control,respectively,to realize the automatic control ability of the lifting devices.By using simulation software,the simulation models of the two control methods are established.Based on the simulation results,it is concluded that the single neuron PID control effectively improves the control performance of the system.In this thesis,the research on the special lifting devices for the wind turbine hub and nacelle provides a new idea for the future design and control mode selection of the special lifting devices for the wind turbine hub and nacelle.