As the WT reaches the rated wind speed, it transits into region 3. Region 3 is often regarded as the full load region. In this region the wind speed is between the rated and cut-out speed and the pitch angle controller controls the rotor rotation at nominal speed while the generator outputs rated power as shown in Fig. 2.
Pitch controlled WTs have an active control system which varies the pitch angle of the turbine blades to decrease torque and rotational speed in WTs. This type of control is usually employed in high wind speeds only where high rotational speeds and aerodynamic torques can damage the equipment.
The conventional controllers are the most commonly used in small wind energy conversion systems. These usually consists of a PID/PI controller for rotor speed and generated power control. These controllers are more suitable for small WT systems.
Variables such as rotor speed, output torque, wind speed, pitch angle and terminal voltage or a combination of these can be used as the input variable to the controller. ANN is suitable for WT control in situations where the aim is optimization of power at wind speeds above the rated wind speed.
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