A pitch system for a wind turbine installation having an electrically driven pitch drive associated with each rotor blade and an electric motor arranged in a rotating part of the wind turbine installation for blade adjustments. A power and control unit is associated with the motor and has line conne
A pitch system for a wind turbine installation having an electrically driven pitch drive associated with each rotor blade and an electric motor arranged in a rotating part of the wind turbine installation for blade adjustments. A power and control unit is associated with the motor and has line connections for the transmission of power and control data from the power and control unit to the motor and vice versa. The line connections are passed via a first rotating bushing arranged at a connecting point between the rotating part and an axially adjacent stationary region. The pitch system also includes second rotating bushing which operates mechanically and electrically separately from the first rotating bushing and is connectable to the power and control unit and to the motor for maintaining reliable transmission of the power and control data if the first rotating bushing fails.
대표청구항▼
1. A pitch system for a wind turbine comprising a plurality of rotor blades and an electrically-driven pitch drive associated with one of the rotor blades, said electrically-driven pitch drive having an electric motor arranged in a rotating portion of the wind turbine for blade adjustment, a power a
1. A pitch system for a wind turbine comprising a plurality of rotor blades and an electrically-driven pitch drive associated with one of the rotor blades, said electrically-driven pitch drive having an electric motor arranged in a rotating portion of the wind turbine for blade adjustment, a power and control unit associated with the electric motor, and all of a first plurality of line connections contained entirely within a first rigid tubular sleeve for transmitting energy and control data between the power and control unit and the motor, the first plurality of line connections being guided via a first rotary feedthrough arranged at a connection location between the rotating portion of the turbine and an axially adjacent fixed region, and a second rotary feedthrough functioning independently from the first rotary feedthrough which is selectively connectable to the power and control unit and the motor in order to maintain reliable transmission of the energy and control data in the event of a failure of the first rotary feedthrough, the second rotary feed through communicating with a second plurality of line connections extending within a second rigid tubular sleeve disposed coaxially with the first rigid tubular sleeve, such that all of the second plurality of line connections are contained within an interior area of the second rigid tubular sleeve and therefore isolated mechanically and electrically from the first plurality of line connections. 2. The pitch system of claim 1 wherein the first and second pluralities of line connections are associated with the first rigid tubular sleeve and the second rigid tubular sleeve, respectively, and wherein both of the first and second rigid tubular sleeves are disposed between the motor and the power and control unit, and the first and second rigid tubular sleeves are independent from one another. 3. The pitch system of claim 1 wherein the first and second rotary feedthroughs are arranged in a parallel manner beside each other. 4. The pitch system of claim 1 wherein the first and second rotary feedthroughs are arranged coaxially with spacing from each other. 5. The pitch system of claim 1 wherein the first and second feedthroughs are arranged axially one behind the other in series and with spacing from each other. 6. The pitch system of claim 1 wherein the first and second rotary feedthroughs are arranged in an adjacent manner axially one behind the other and are surrounded by a common housing. 7. The pitch system of claim 1 wherein each of the first and second rotary feedthroughs comprises a slip ring unit having an individual housing, a slip ring and a contact arm, and where the contact arm is operable to be pressed onto the slip ring in order to transmit the energy and control data. 8. The pitch system according to claim 7 wherein at least one of the slip ring units further comprises a pressure reduction device on the slip ring for adjusting a pressing force of the contact arm. 9. The pitch system according to claim 8 wherein the pressure reduction device is selected from the group consisting of a magnetic device and an electromagnetic device which, in the absence of at least one of an energy signal and a control signal, enables a contact pressure applied by the contact arm to be controlled for selectively forming and interrupting electrical contact between the contact arm and the slip ring. 10. The pitch system according to claim 9, wherein the pressure reduction device is constructed in such a manner that, in the event of a voltage drop or a magnetization drop in the line connection between the motor and the power and control unit, there is produced a contact pressure of the contact arm which produces the electrical contact. 11. The pitch system claim 1 wherein the first rotary feedthrough is supported on the first tubular sleeve and the second rotary feedthrough is supported on the second tubular sleeve, the latter being arranged coaxially with respect to the former, and wherein one of a line inlet and a line outlet of the first rotary feedthrough is carried out in a radially extending external annular space formed by a diameter difference between the first and second tubular sleeves, and the other of the line inlet and the line outlet is carried out in the radial inner space of second tubular sleeve. 12. The pitch system of claim 1 wherein the power and control unit further comprises an uninterruptible power supply. 13. The pitch system of claim 1 wherein a rotating portion of the pitch drive has only one electric motor and the associated power and control unit is arranged in the fixed region, and wherein a switching device connects the associated power and control unit to one of the two rotary feedthroughs. 14. The pitch system according to claim 13 further comprising an emergency power supply associated with the power and control device, which is connected to an independent energy source. 15. The pitch system of claim 1 wherein the power and control unit further comprises a convertor. 16. The pitch system of claim 15 wherein the convertor comprises at least a rectifier and a power control unit. 17. The pitch system of claim 16 wherein the power control unit is arranged directly on the motor, and wherein the rectifier and an emergency power supply device are arranged in the fixed region. 18. The pitch system of claim 1, wherein the power and control unit comprises a first power and control unit and a second power and control unit, and wherein in the event of failure of the first power and control unit, the second power and control unit is switchably connected to the motor of the power and control unit. 19. The pitch system according to claim 18 wherein the first power and control unit and the second power and control unit are each constructed as a convertor. 20. The pitch system of claim 1, wherein the power and control unit comprises first, second and third power and control units, and wherein the system further comprises second and third motors, such that the first plurality of line connections are guided via the first rotary feedthrough, and the second plurality of line connections includes three additional line connections which are guided via the second rotary feedthrough and which are switchably connected to each of the motor, the second motor and the third motor. 21. The pitch system according to claim 20 wherein the first, second and third power and control units are each constructed as an independent convertor. 22. A wind turbine having the plurality of rotor blades and a pitch system according to claim 1. 23. A pitch system for a wind turbine having a plurality of rotor blades and at least one electrically-driven pitch drive associated with one of the rotor blades, the electrically-driven pitch drive comprising: an electric motor arranged in a rotating portion of the wind turbine for blade adjustment;a power and control unit associated with the electric motor;line connections for transmitting energy and control data between the power and control unit and the motor;the line connections being guided via a first rotary feedthrough arranged at a connection location between the rotating portion of the wind turbine and an axially adjacent fixed region, and a second rotary feedthrough functioning mechanically and electrically separately independently from the first rotary feedthrough which is selectively connectable to the power and control unit and the motor in order to maintain reliable transmission of the energy and control data in the event of a failure of the first rotary feedthrough;wherein the power and control unit further comprises a convertor;wherein the convertor comprises at least a rectifier and a power control unit;wherein the power control unit is arranged directly on the motor; andwherein the rectifier and an emergency power supply device are arranged in the axially adjacent fixed region.
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이 특허에 인용된 특허 (3)
Janssen, Wilhelm; Luetze, Henning; Buecker, Andreas; Hoffmann, Till; Hagedorn, Ralf, Low voltage ride through for wind turbine generators.
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