What is pitch control in wind turbines?

Pitch control is the technology used to operate and control the angle of the blades in a wind turbine. The system is in general either made up by electric motors and gears, or hydraulic cylinders and a power supply system.

How does it work?

The pitch system is a closed loop drive system. The turbine main controller calculates the required pitch angle from a set of conditions, such as wind speed, generator speed and power production.

The required pitch angle is transferred to the pitch system as a set point. If the actual angle is NOT the same as the set point, the system will direct power to the electric motor or fluid to the cylinder in order to make the actuator move the blade to the required angle.