초록 ▼

A redundant and fail-safe blade system of a wind turbine includes at least one blade pitch drive (20, 21, 22) and at least two power control modules (60, 61, 62, 6′) for controlling the blade pitch drive (20, 21, 22). The power control modules (60, 61, 62, 6′) are connected to the blad

A redundant and fail-safe blade system of a wind turbine includes at least one blade pitch drive (20, 21, 22) and at least two power control modules (60, 61, 62, 6′) for controlling the blade pitch drive (20, 21, 22). The power control modules (60, 61, 62, 6′) are connected to the blade pitch drive (20, 21, 22) by a switching unit (10) which allows an alternative connection between the blade pitch drive (20, 21, 22) and any of the power control modules (60, 61, 62, 6′). In operation, the blade pitch drive (20, 21, 22) is controlled by only one of the power control modules (60, 61, 62, 6′). If a malfunction of the currently operating power control module (60, 61, 62, 6′) is detected, switching unit (10) provides a connection to the other power control module (60, 61, 62, 6′) to allow an ongoing operation of the wind turbine without an unplanned or forced shut-down.

대표청구항 ▼

The invention claimed is: 1. Blade pitch system for a wind turbine comprising at least one electrical blade pitch drive (20, 21, 22) for changing a rotor-blade's pitch angle, at least two power control modules (60, 61, 62, 6′) for controlling said blade pitch drive (20, 21, 22) in order to a

The invention claimed is: 1. Blade pitch system for a wind turbine comprising at least one electrical blade pitch drive (20, 21, 22) for changing a rotor-blade's pitch angle, at least two power control modules (60, 61, 62, 6′) for controlling said blade pitch drive (20, 21, 22) in order to adjust said rotor-blade's pitch angle, and at least one switching unit (10) for connecting said blade pitch drive (20, 21, 22) with each of said two power control modules (60, 61, 62, 6′). 2. Blade pitch system as claimed in claim 1, characterized in that said switching unit (10) allows an alternative connection between said blade pitch drive (20, 21, 22) and each of said two power control modules (60, 61, 62, 6′). 3. Blade pitch system as claimed in claim 1, characterized in that said blade pitch system comprises n blade pitch drives (20, 21, 22) and at least n power control modules (60, 61, 62, 6′), where n is a natural number greater than 1, and said n power control modules (60, 61, 62, 6′) are connected with said n blade pitch drives (20, 21, 22) by said switching unit (10). 4. Blade pitch system as claimed in claim 3, characterized in that said switching (10) unit allows a connection of any of said n power control modules (60, 61, 62, 6′) with any of said n blade pitch drives (20, 21, 22). 5. Blade pitch system as claimed in claim 3, characterized in that said blade pitch system comprises in addition to said n power control modules at least a further power control module (6′), and said switching unit allows a connection of said further power control module (6′) with each of said n blade pitch drives (20, 21, 22). 6. Blade pitch system as claimed in claim 1, characterized in that said blade pitch system comprises at least two rectifiers (12, 12′) and an optional switching unit (16) for connecting said rectifiers (12, 12′) with said power control modules (60, 61, 62, 6′). 7. Blade pitch system as claimed in claim 1, characterized in that said blade pitch system further comprises a management unit (18) for controlling said switching unit and/or said optional switching unit. 8. Method for operating of a wind turbine, said wind turbine comprises at least one electrical blade pitch drive (20, 21, 22) for changing a rotor-blade's pitch angle, at least two power control modules (60, 61, 62, 6′) for controlling said blade pitch drive (20, 21, 22) in order to adjust said rotor-blade's pitch angle, and at least one switching unit (10) for alternatively connecting said blade pitch drive (20, 21, 22) with each of said two power control modules (60, 61, 62, 6′), the method comprising the steps of: a) monitoring that power control module which is currently connected with said blade pitch drive for detecting a malfunction of said power control module, b) if detecting a malfunction then disconnecting said malfunctioned power control module from said blade pitch drive and connecting said blade pitch drive with the other of said two power control modules by said switching unit. 9. Method according to claim 8, characterized in that said wind turbine further comprises a management unit (18) for controlling said switching unit (10) and for monitoring said power control modules (60, 61, 62, 6′). 10. Method for emergency shut-down for a wind turbine, said wind turbine comprises at least two rotor-blades, at least two electrical blade pitch drives (20, 21, 22) for independently changing the pitch angle of said two rotor-blades, at least two power control modules (60, 61, 62, 6′) for controlling said two blade pitch drives (20, 21, 22) in order to adjust said pitch angles, and at least one switching unit (10) for alternatively connecting any of said two power control modules (60, 61, 62, 6′) with any of said two blade pitch drives (20, 21, 22), the method comprising the steps of: a) monitoring said two power control modules for detecting a malfunction of said two power control modules, b) if detecting a malfunction of one of said two power control modules then b1) adjusting the pitch angle of that rotor-blade having a functioning power control module to a parking position, b2) connecting the functioning power control module with that blade pitch drive whose power control module is malfunctioned by said switching unit, and b3) adjusting the pitch angle of the other rotor-blade to a parking position.