Study On The Yaw Control Method Of Wind Turbine Based On Wind Direction Prediction

With the development of wind power technology,the capacity of wind turbine is increasing,and the yaw control system of wind turbines is becoming more and more crucial.The excellent yaw control can not only ensure that the wind turbine is facing the inflow to improve output power,but also reduce the load of wind turbine to prolong the life.Therefore,the yaw control method is divided into the yaw restart control method and the yaw execution control method and optimized separately.The main research contents are as follows:(1)Establish the 1.5MW wind turbine model in GH-Bladed,and study the wind turbine output power,the key component load and vibration under the different wind speed and yaw error;Write the traditional yaw control program,according to the simulation results,the effects of yaw angle threshold and yaw delay time on output power and yaw times are analyzed.By analyzing the yaw comprehensive characteristics,the corresponding yaw control parameters are set for different wind speed ranges.The simulation results show that the yaw control method based on the yaw comprehensive characteristics can improve the wind turbine output power of the wind turbine under rated wind speed,and reduce the load of the effectively above the rated wind speed.(2)To solve the problem of frequent yaw of wind turbine caused by yaw lag,the yaw execution control method based on average wind direction prediction is proposed.Establish the ARIMA model,differentiate the raw unsteady wind direction data,and the best prediction mode is used to predict the average wind direction according to the minimum Akaike information criterion.The yaw control system performing yaw control based on the predicted average wind direction can avoid the frequent yaw due to the frequently changing wind direction.The simulation results show that,compared with the traditional yaw control methods,the yaw control method based on the average wind direction prediction can effectively reduce the yaw times under guaranteeing the output power of wind turbines.