A Control System for Anti Typhoon Blade Locking Device
Wind turbines in coastal areas are hit by typhoons every year,and wind turbines need to have the ability to survive in typhoons.When a typhoon occurs,the wind turbine stops and the blades retract to a feathered state.The electromagnetic brake at the tail of the pitch motor locks the blades.However,as the electromagnetic brake wears out for a long time,the holding torque of the electromagnetic brake decreases,which cannot guarantee that the blades will be locked under extreme load conditions such as typhoons.The blades will be blown away from the safe position of the feathered blade,causing displacement or even rotation.Moreover,the early developed blade locking device required entry into the hub and manual operation to lock the blades.If the number of units is large,it is not only necessary to start locking the blades early,but also time-consuming and laborious,reducing power generation.The new blade locking device is an electrically controlled mechanical action for locking,which is safe and reliable.It can also be remotely controlled by PLC to lock the blades.This article describes a blade locking device that is easy to install and can be remotely and automatically controlled.
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