Research On Control Strategy Of Direct-driven Permanent Magnet Synchronous Wind Power Generation System

Wind energy is the most widely used green and renewable energy in the world.Wind power generation is the most important way to use wind energy,and it is a mature energy utilization technology,which is suitable for industrial development.It has high power generation efficiency,clean and environmentally friendly characteristics and high energy output.However,the direct connection between the fan shaft and the generator rotor of the direct-drive permanent magnet synchronous generator does not take into account the role of the intermediate gearbox,which reduces the operation and maintenance costs.Therefore,the research on direct-drive permanent magnet synchronous wind generator has become the mainstream in the field of wind power generation.In this paper,the improvement of maximum power tracking technology of permanent magnet synchronous wind turbine and the improvement of rectifier control strategy of wind turbine are the main research contents.Firstly,the principle of the maximum power tracking technology of wind turbines is expounded.Then,aiming at the delay error caused by the randomness of wind speed in the process of capturing the maximum wind energy,based on the BP neural network model,this study puts forward a method of introducing genetic algorithm to optimize the data results.Finally,a model based on GA-BP neural network is built,and the wind speed in the future is predicted through the built model,and then the predicted results are input into MPPT model.This method can be effective.Then,the mathematical model of the generator side rectifier of the permanent magnet synchronous generator is analyzed in detail.The space vector pulse width modulation is taken as the main control strategy of the three-phase voltage source PWM rectifier,the grid-side inverter adopts the vector control strategy based on the grid voltage orientation,and the online PI parameter tuning method based on the improved sparrow search algorithm of the unit model is adopted,with the improved PI controller as the main controller of the unit.Compared with the standard sparrow search algorithm under different wind conditions,it can be concluded that this method can effectively reduce the fluctuation of system output power,adjust the active power quickly and smoothly,and has certain anti-disturbance ability,and finally improve the control effect of the controller.Finally,the maximum power tracking simulation model of permanent magnet synchronous generator and the simulation model of rectifier control system are built on MATLAB/SIMULINK simulation platform,and then the overall reliability of the improved control strategy of permanent magnet synchronous fan power generation system is verified by comparative analysis.