Stall Control

From Wind wiki

Stall control is the simplest and least expensive of all the control methods. Stall control, though it’s useful, poses many disadvantages such as energy loss, high stationary loads, and no assisted start.

The power coming from the turbine is controlled aerodynamically. Because of aerodynamic control, stall-controlled wind turbines do not experience fluctuating power as a result of pitch mechanism. They are also not assisted at the start, because the turbine’s power is not regulated during the connecting sequence.