The wind power has to be controlled by means of the
aerodynamic system and has to react based on a setpoint
given by a dispatched center or locally with the
goal to maximize the power production based on the
available wind power. The power controller should also
be able to limit the output power.
Below maximum power production the wind turbine
will typically vary the speed proportional with the wind
speed and keep the pitch angle fixed. A pitch angle
controller limits the power when the turbine reaches its
rated power as described in §III.