stall 和active stall

v3905

stall被翻譯成失速，active stall 翻譯成主動失速
當風速超過一定值時，會在槳葉后緣形成漩渦，從而使功率曲線下降，發電量降低。這就是失速
主動失速是利用這個特性，當風過大時候，變動槳葉，使空氣在葉片后緣形成漩渦，降低發電量，從而避免超發，對系統造成損壞
active stall
ACTIVE STALL CONTROL (ASC)



The power control of the Turbowinds' wind turbines is based on the Active Stall Control (ASC) principle.

The ASC offers both the advantages of pitch-controlled blades and the stall effect, currently being used in the classic stall regulated wind turbines. Due to the pitch-controlled blades, the rated power level can be tuned precisely, eliminating effects of differences in air density, blade-surface contamination etc. This way, the uncertainties in the rated power level (typical for the passive stall control) can be avoided.

Consequently the ASC guarantees maximum power output for all environmental conditions without overloading the drive train of the turbine.


Besides providing power control, the blade pitch system is also used to accelerate the blades from idling to operational speed and bringing the rotor back to a safe idling situation in case of a grid loss or any other functional error (aero -braking).

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