Research On Kite Power Generation System Based On Adaptive Control

High-altitude wind power is a new class of wind energy converters.The use of a tethered aircraft to connect the aircraft to the ground base station via one or more tethered cables is intended to capture wind energy at significantly increased altitudes,using on board equipment to convert mechanical energy into electrical energy to produce available power.Because it can obtain wind energy in the atmosphere that traditional wind turbines cannot enter,it has strong economic feasibility.The type of aircraft is at the heart of the high-altitude wind power system.In this paper,high-altitude wind power generation system is taken as the research object.Considering the different structural characteristics of different types of aircraft,there are problems such as excessive diameter,difficult to control during take-off and landing,and complicated mathematical model of multi-point quality kites.This paper has done the following research:First introduced the three main types of kites in the system: leading edge inflatable kites,Ram air traction kites,delta kites,comparing their advantages and disadvantages.A mathematical model of a single-line system kite was established and the kite movement was defined with appropriate assumptions.The simulation of the kite model proves that the single-line kite model can be effective and can be controlled by parameters such as heading angle and azimuth.It provides a reference for the selection and application of kite models in different control systems for high-altitude wind power generation.Secondly,the establishment of a single point quality kite model is introduced.Based on the single-point mass kite model,based on the consideration of all major system components:tether,kite and generator dynamics,an improved single-point mass model containing rotational inertia during flight is established.The variable constraints in the improved kite point quality model were analyzed.Since the electrical efficiency of the system affects the power output of the kite power system,the electrical efficiency of the system is also analyzed,and the electrical efficiency is modeled as a function of the speed and torque,so that the output power is more realistic,and then improved by simulation.The system was verified by simulation.Again,it is considered that the structure of the kite has characteristics that change with time and that the wind speed cannot be measured in real time.The flight path of the kite is predicted based on the system identification.The advantage of using system identification is that information about the system can be extracted from the data without iterating,even if the initial condition is zero,no singularities are obtained in the solver.A stochastic gradientalgorithm is cited,which can be used to estimate parameters quickly and smoothly.The case simulation analysis is carried out through the simulation software MATLAB.The improved single-point mass model proposed in this paper can effectively change the heading angle,elevation angle,etc.without affecting the influence of turbulent wind,and control the movement of the kite craft according to the established flight path.It shows that the improved single-point quality kite model is more realistic and can optimize the flight path.The system identification algorithm can be used for the time-varying characteristics of wind speed and other parameters in the kite power system,and can be effectively calculated without iteration.The output signal can be determined based on the input signal and the characteristics of the system.Suitable for any kite type and tether type system.Flight path adaptive control is easy to implement and simple to calculate.