Research On Maximum Power Tracking Backstepping Control Of Vertical Axis Permanent Magnet Direct Drive Wind Turbine

Wind energy is one of the most commercially valuable and promising new energy sources.In our country,the annual average wind speed in 3~5m/ s low-speed wind field accounted for 76% of the national land wind farms,the characteristics of the wind field is small wind and instability,the solution is vigorously develop small and medium-sized power off grid wind turbine generator.Therefore,in-depth study of small and medium power grid wind power generation technology in line with China's existing national conditions,has a very high practical value.In this context,the 200 W direct drive type vertical shaft wind power generation system as the research object,comprehensive involves various disciplines in the forefront of the knowledge,to carry out the following a series of research work: first of all,a comprehensive exposition of the vertical axis of the permanent magnet synchronous wind power generation system the principle and basic structure.At the same time,it also introduces the principle of the maximum power tracking of the wind turbine,and the vector control strategy of the generator is introduced.Secondly,in the grasp of the principle of wind power generation based on using MATLAB / Simulink as a simulation tool,to two kinds of topological structure of system modeling,the permanent magnet synchronous generator speed control and maximum power tracking control method are carried on the simulation,and analyze its characteristics,do some basic work for the in-depth study of wind power generation system control strategies.A maximum power control algorithm based on the extended state observer and backstepping control is used to solve the problem that wind turbine torque is not measurable,speed tracking effect is not ideal in the process that the vertical axis direct drive permanent magnet synchronous wind power generation system capture the maximum wind in this paper.According to the Back-stepping design method,the Lyapunov function of each subsystem is constructed,and the virtual control function is derived by step by step,and the actual control function is obtained.According to the Barbalat inference,it is proved that the actual control function derived from the Lyapunov function can ensure the global consistency and stability.Using MATLAB/Simulink modeling and Simulation of vertical axis wind power generation system based on back stepping,system verification in order jump speed and dynamic speed controller to complete the MPPT control effect,and compared with PID control.The simulation results show that the MPPT controller based on Back-stepping has a certain effectiveness and superiority.Finally,the electric control system of vertical axis wind power generation is designed.To include the main control chip,the storage system,power conversion system and other subsystems were introduction and analysis,selected parameters,finally to design and production to complete the digital controller is tested,and the analysis of the phenomenon,and selected parameters compare with standard,to draw a conclusion: The completed design of digital controller parameters correctly,can finish imparts its wind power generation control function.