Invention Grant
US08240990B2 Apparatus and method for reducing asymmetric rotor loads in wind turbines during shutdown 有权
关闭期间降低风力发电机不对称转子负载的装置和方法

Apparatus and method for reducing asymmetric rotor loads in wind turbines during shutdown
Abstract:
An apparatus and method for reducing asymmetric rotor load in a wind turbine includes calculating a time delay for pitching each blade toward feather upon initiation of a shutdown condition. The blades with the larger blade angle begin moving toward feather with an initial pitch rate, while the blade with the smallest blade angle begins moving toward feather with a final pitch rate. Once all the blades have reached approximately an identical blade angle, the blades move simultaneously together to feather at the final pitch rate. By introducing the time delay for pitching the blades having higher blade angles at the final pitch rate, a simple, time-based correction of initial conditions during shutdown reduces the extreme loads on turbine components.
Information query
Patent Agency Ranking
0/0