WIND TURBINE BLADE PITCH CONTROL SYSTEM

摘要

The present invention provides an improvement for a wind turbine (20) having at least one blade (21 ) mounted on a hub (22) for controlled rotation about a blade axis (Yb-Yb) to vary the pitch of the blade relative to an airstream. The hub is mount ed on a nacelle (23) for rotation about a hub axis (Xh-Xh). The wind turbine includes a main pitch control system for selectively controlling the pitch of the blade, and/or a safety pitch control system for overriding the main blade pitch control system and for causing the blade to move toward a feathered position in the event of an overspeed or fault condition. The improvement includes: an energy storage device (26) mount ed on the nacelle and associated with the blade; a pitch-axis controller (25) mounted on the nacelle and associated with the blade and with the energy storage device; an electro-mechanical actuator (28) mounted on the hub and associated with the blade; and at least one slip ring (29) operatively arranged to transmit power and/or data signals between the pitch-axis controller and the electro-mechanical actuator; whereby the mass on the rotating hub may be reduced.