This is directly from Langenscheidts Fachwoerterbuch Technik.

From the first link below (compensators used for blade pitch control):

The utility network must provide the power to initiate operation. The electrical power system for the wind turbine consists of the generator, the compensator, the utility interface switchgear and associated protective equipment. The generator is a 20kW, induction machine with a rated output voltage of 380 V, three phase, four wire, 60 Hz and a rated input of 1816 rpm.

The control system to accomplish the majority of the control functions can be divided into five distinct control systems. These five control systems consists of rotor blade pitch control, yaw control, microprocessor control, the safety system and monitoring system.

See second link for blade pitch control in helicopters.