Research On Control Strategy For Yaw System Of Wind Turbine

As a clean renewable energy source,wind energy has great advantages and utilization prospects.After decades of continuous development,wind power generation technology has developed into the wind energy utilization technology with the most development conditions and development prospects.In order to improve the utilization of wind energy,increase the generation efficiency of wind turbines,and reduce the cost of wind power generation,various countries have conducted in-depth research on the yaw system of wind turbines,and has made great progress.However,research on wind control for yaw restart is progressing slowly.From the perspective of energy saving and consumption reduction,this paper analyzes the yaw costs of wind turbines at low wind speeds,the influence of wind speed distribution on yaw,and adopts a fuzzy decision method to improve the traditional yaw control strategy.The main research content is as follows:(1)This paper first studies the yaw control system in a wind turbine,analyzes the factors that influence the yaw control,and introduces the structure of the yaw control system.The influence of changes in wind direction and wind speed on the yaw control system was studied.(2)We study and analyze the restart-to-wind strategy adopted by large-scale wind turbines,and improve the control strategy based on the yaw error angle θ and the delay threshold T to control the restart of the yaw motor.We analyze and calculate the yaw loss and operation and maintenance costs of wind turbines,construct a cost function based on yaw loss,and propose a restart-to-wind strategy that takes into account the yaw costs of wind turbines at low wind speeds.(3)Study and analyze the functions and principles of each part of the wind turbine,model the fan in the Matlab/Simulink platform,and design the main program of the climbing algorithm.We build a yaw-executed wind control simulation module based on the hill-climbing algorithm,and build a yaw-reset-to-wind simulation module based on the loss calculation.We simulate the above modules.The simulation results verify the feasibility and reliability of the algorithm.(4)Analyze and study the relationship between wind speed distribution and wind turbine power change rate,further improve the above-mentioned proposed restart wind strategy,and propose a fuzzy strategy-based yawing system restart wind strategy.The simulation results show that the new restart-to-wind strategy can achieve the shift of the number of operations of the yaw mechanism from the low wind speed zone where the power growth is slow to the mid-wind speed zone,and increase the yaw power generation efficiency of the wind turbine while prolonging the life of the yaw system.