Pilot circuitry for controlling the emergency feathering of a wind turbine
AssigneeVestas Wind Systems A/S
InventorsJesper Lykkegaard Andersen, Jens Bay Madsen
Life of this patent
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Abstract
A pilot circuitry is disclosed for controlling the activation of an emergency feathering system of a wind turbine by means of a pilot pressure, wherein the pilot circuitry comprises at least two parallel control circuits for providing a pilot pressure. Additionally, a selector may be provided for selectively preventing a control circuit from providing the pilot pressure to the emergency feathering system in case of malfunction of the control circuit.
Claims11
A pilot circuitry for controlling the activation of an emergency feathering system of a wind turbine by using a pilot pressure, the pilot circuitry comprising:
- a first control circuit for providing a pilot pressure;
- and
- a second control circuit for providing a pilot pressure, wherein the first and second control circuits are in parallel with each other;
- and
- a selector operatively coupled to the first and second control circuits and to the emergency feathering system, wherein the selector prevents the first control circuit from providing the pilot pressure to the emergency feathering system in case of malfunction of the first control circuit, and the selector prevents the second control circuit from providing the pilot pressure to the emergency feathering system in case of malfunction of the second control circuit.
A wind turbine, comprising:
- a rotor with at least two blades;
- and
- a blade pitch system for controlling the pitch angle of the blades, the blade pitch system comprising:
- at least one hydraulic actuator;
- an emergency feathering system for a case of an emergency stop to turn the blades to a feathering position using the at least one hydraulic actuator;
- and
- a pilot circuitry comprising a first control circuit for providing a pilot pressure, a second control circuit for providing a pilot pressure, wherein the first and second control circuits are in parallel with each other, and a selector operatively coupled to the first and second control circuits and to the emergency feathering system, wherein the selector prevents the first control circuit from providing the pilot pressure to the emergency feathering system in case of malfunction of the first control circuit, and the selector prevents the second control circuit from providing the pilot pressure to the emergency feathering system in case of malfunction of the second control circuit.
Dependencies are inferred from the claim text.