Research On Flight Path Optimization Of Kite Generator

Wind energy is widely used in power generation because of its advantages of sustainable renewable and environmental protection.The traditional wind power system has high manufacturing cost,difficult installation and maintenance,and high requirements for installation location and environment.In recent years,high-altitude wind energy has attracted the attention of many researchers and companies.Compared with surface wind energy,high-altitude wind energy is stable and strong,which can generate stable electric energy.Moreover,the construction cost of high-altitude kite generator system is low,and the power generation efficiency is higher than the traditional land wind turbine.In this paper,the high altitude kite generator is taken as the research object,and its dynamic modeling and simulation are carried out.This paper analyzes and optimizes the trajectory of the kite device in the operation process,so that the kite can achieve the maximum power generation along the optimal trajectory.The main contents include the following aspects:1)The modules of kite generator system are analyzed,and its function and power generation process are studied.2)The system dynamics modeling based on Lagrange equation of motion is established.The kite generator system is simulated and the motion track of high altitude kite device is simulated.The corresponding parameters of kite motion track are measured in real time.3)On the basis of system simulation,the maximum power generation of kites is expressed as the design of key trajectory parameters of kites in high altitude,such as changing the length of tether,the angle of attack,the ratio of length to width of kite area,etc.The parameters that affect the trajectory of the kite in the process of running are analyzed with the traction of the tether as the reference standard.4)This paper analyzes the types of the running track of the kite device in the Kite generator system,selects the open eight shaped track as the research object,analyzes the objective function of the traction stage and the recovery stage,and establishes the running track control model.Radau pseudo spectrum method is used to optimize the control model,and the optimal trajectory and corresponding parameters are obtained.In this paper,the theoretical simulation method is used to simulate the model and motion process of the kite generator.Without considering the deformation of the kite turning process,it is concluded that the angle of attack and the aspect ratio of the kite area have a greater impact on the power of the power generation process,which provides a reference standard for the selection and control of kites and the optimization of the trajectory.A point mass model is introduced to design the flight path of kites,and Radau pseudospectral method is used to optimize the single open octagonal trajectory in the traction phase,so as to obtain the optimal reference trajectory of kites in high altitude.Flying kites along the optimal trajectory is helpful to improve the power efficiency of power generation cycle and maximize the economic benefits of high altitude wind power generation.