Research On Wind Turbines Re-cut-in Control On Typhoon Conditions

Under the condition of typhoon,the wind load of the wind turbine may exceed the limit load,and then threaten the safety of the wind turbine.The wind turbine is provided with a cut-out wind speed of about 25m/s,and when the wind speed exceeds the cut-out wind speed,the brake is stopped,and when the wind speed is reduced,and then the normal operation is resumed,so as to ensure the safety of the wind turbine.But when the wind speed fluctuations in cut-out wind speed,the wind turbine may be due to repeated cut-out and then re-cut-in to start and stop frequently,which not only greatly accelerated mechanical components aging and fatigue,and may also be due to the frequent operation of circuit breaker,resulting in temperature increased significantly to improve the rate of wind turbines' fault.Aiming at this problem,using Hong Kong Cheung Chau weather station wind speed observation data,and then we will launches research on re-cut-in control under typhoon conditions.In order to avoid the frequent cutting out of the wind turbine during the typhoon,the paper puts forward that the wind turbine re-cut-in control after cutting out by the combined dead zone of wind speed and time.The re-cut-in wind speed and the delay dead zone time are seated lower than the cut-out wind speed,and the wind power generation unit can be restarted only when the time of the wind speed is continued lower than the re-cut-in wind speed is greater than the dead time.Based on the combination of various wind speeds and time,the numerical simulation is carried out.The simulation results show that using the appropriate selection of the combined dead zone of wind speed and time to conduct re-cut-in control,in the wind machine cut-out times and reduce the unit number of cut-out power loss were significantly superior to the existing single wind speed dead band control method,because of the simple and effective,with strong practicability.Other wind field can also be based on local wind conditions.Combined with the reduction of the number of units cut out of the acceptable loss of power loss,and then set the cup in again to wind speed and time dead zone.This paper also studied the based on ARIMA algorithm ultra-short term wind speed prediction to conduct wind generator re-cut-in control under typhoon.When the wind machine cut out,only when the wind speed less than re-cut-in wind speed and wind speed prediction in the future does not exceed the cut-out wind speed recovery wind turbine operation.Numerical simulation shows that because of wind speed rate of change under typhoon,based on ARIMA ultra short term wind speed prediction is difficult to achieve higher prediction accuracy,based on ARIMA ultra short term wind speed prediction to conduct re-cut-in control's effect is evidently inferior to control effect based on the combined deadzone,still need to be combined with typhoon characteristics to research applicable prediction method to reduce the threat of typhoon on the wind generator.