EP2501931A1 - Wind turbine - Google Patents

Abstract

The invention relates to a wind turbine comprising a machine support (5), a rotor (6) which can be driven by wind (13) to rotate about the rotor axis (7) and is mounted so that it can rotate on the machine support (5) about a rotor axis (7), said rotor comprising a rotor hub (8) and several rotor blades (9, 10) which extend respectively in the direction of a blade axis (11, 12) running transverse or essentially transverse to the rotor axis (7) and are mounted so that they can rotate on the rotor hub (8) about the respective blade axis (11, 12), blade angle adjustable drives (17, 18) are arranged on the rotor (6) and enable the rotor blades (9, 10) to rotate about the blade axes thereof (11, 12), at least one blade angle control device (24) is coupled to the blade angle adjusting drives (17, 18) and can control the blade angle adjusting drives (17, 18), and at least one electric generator (15) which is mechanically coupled to the rotor (6) and which can be driven by said rotor, said generator can generate electric energy. Said blade angle control device (24) comprises several control units (22, 23) which are respectively coupled to the blade angle adjusting drives (17, 18) enabling a first control unit (22) to be fixed to the rotor (6) and a second control unit (23) to be fixed to the machine support (5).

Description

 Wind turbine

description

The invention relates to a wind turbine with a

Machine carrier, one about a rotor axis rotatable on

Engine carrier stored and by wind to one

Rotary movement about the rotor axis drivable rotor comprising a rotor hub and a plurality of rotor blades, each in the direction of a transverse or substantially transversely to

Rotor axis extending blade axis extend and are mounted rotatably about their respective blade axis on the rotor hub, arranged on the rotor Blattwinkelverstellantrieben, by means of which the rotor blades are rotatable about their blade axes, at least one with the Blattwinkelverstellantrieben

coupled blade angle control device, by means of which the Blattwinkelverstellantriebe are controllable, and at least one mechanically coupled to the rotor and driven by this electric generator, by means of which

electrical energy can be generated.

Modern wind turbines include rotor blades rotatably mounted on a rotor, in which by individual change of the blade angle of the angle of attack of the wind can be varied. Such a pitch-controlled wind turbine is known for example from DE 103 38 127 B4. In these wind turbines is the pitch system for the adjustment of the rotor blades completely in the rotor, so arranged in the rotating part of the wind turbine. The pitch system is connected to an AC power grid and includes a rotor for each rotor blade, the control and regulating devices for

Adjustment of the rotor blade and a converter are assigned. In the event of mains faults or power failure, it must be ensured that the power supply to the motor is maintained for at least a short time. Therefore, the pitch system for each rotor blade has one arranged in the rotor

DC voltage source in the form of a battery or an electrical energy storage, which is connected directly to the respective engine in case of power disturbances. By the adjusting movement of the motor, the respective rotor blade is brought into the so-called. Fahnenstellung and thus turned off the wind turbine. In addition, in the known pitch system via switching devices is a connection each

DC voltage source with the respective motor via the arranged in the rotor blade angle control device possible, so that an indirect, controlled or regulated adjustment of the rotor blade can be done without the system

must be switched off.

EP 1 707 807 A2 shows another pitch system for a wind turbine with a DC drive for the

Blade adjustment. The voltage rectification for the motor is carried out by means of a bridge circuit, the active

electronic switching elements and at the same time serves as an energy source for the pitch system in case of power disturbances or power failure. Again, the pitch system

completely arranged in the rotating part of the wind turbine. The arrangement of the pitch system in the rotating part of the wind turbine is associated with considerable disadvantages. During rotation, the components of the pitch system are subject to a high number of fatigue processes caused by the movement of the rotor. The components must therefore be designed especially for their rotational movement both mechanically and electrically special, so that the manufacturing cost of the components are relatively high. The arrangement of the blade angle control device in the rotor is additionally associated with a considerable outlay and costs for the communication of the pitch system with a wind turbine control arranged outside the rotor.

The complete arrangement of the pitch system in the rotor is also associated with the maintenance of the wind turbine with disadvantages, as the access to the pitch system in the

rotating plant part very expensive and for the

Service staff is a hindrance. In addition, the cramped arrangement in the rotor requires additional means for controlling the temperature of this area.

Proceeding from this, the present invention seeks to be able to realize at least partially with simpler components in a wind turbine of the type mentioned, the Blattwinkelsteuereinrichtung.

This object is achieved with a wind turbine according to claim 1. Preferred embodiments of the invention are given in the dependent claims. The wind turbine according to the invention comprises a machine carrier, one about a rotor axis rotatable on

Engine carrier stored and by wind to one

Rotary movement about the rotor axis drivable rotor having a rotor hub and a plurality of rotor blades, each in the direction of a transverse or substantially transversely to

Rotor axis extending blade axis extend and are mounted rotatably about their respective blade axis on the rotor hub, arranged on the rotor Blattwinkelverstellantriebe, by means of which the rotor blades are rotatable about their blade axes, at least one with the Blattwinkelverstellantrieben

coupled blade angle control device, by means of which the Blattwinkelverstellantriebe are controllable, and at least one mechanically coupled to the rotor and driven by this electric generator, by means of which

electrical energy can be generated, wherein the

Blattwinkelsteuereinrichtung several, each with the

Blattwinkelverstellantrieben coupled control units comprises, of which a first control unit on the rotor and a second control unit is attached to the machine frame.

By dividing the blade angle control device into a plurality of control units, of which the first control unit is rotatable together with the rotor about the rotor axis relative to the second control unit arranged on the machine control unit, several components of the blade angle control device, in particular the components of the second control unit, on

Machine support provided so that the number of rotatable about the rotor axis components is reducible. Thus, fewer components for rotation about the rotor axis

interpreted, whereby costs can be saved. For example, in the second control unit simple electric contactors can be used, which are not rotationally fixed. In particular, the invention pursues the goal of

To keep the number of components arranged in the rotor as small as possible.

Furthermore, due to the reduced number

electrical components in the rotor the advantage that less heat is produced in the rotor, so the risk of

Overheating of components arranged in the rotor

is reducible. An additional advantage is that due to the reduced number of electrical components in the rotor in this more clearance is created so that more space for service staff is available in the rotor. Also, the cabling effort can be reduced.

The blade angle control device can preferably be supplied with electrical energy by an electrical power supply device. Further, that of the generator

producible electrical energy preferably deliverable in an electrical network. According to one embodiment of the invention, the electrical power supply device is electrically coupled to the network or formed by the network. In the first case, the power supply device is preferably supplied from the network with electrical energy. The

Power supply device preferably forms a

AC power source, in particular a multi-phase

AC power source, such as a three-phase source. The network is preferably an AC network, in particular a

multi-phase network, such as a three-phase network. The Blattwinkelverstellantriebe are preferably controllable and / or regulated by means of the first control unit.

In particular, the blade angle control device has one or more attached to the rotor and with the first

Control unit electrically coupled first electrical

Energy storage, by means of which, in particular in case of failure of the power supply device and / or the network, the Blattwinkelverstellantriebe and / or the first

Control unit at least temporarily with electrical

Energy can be supplied. The first electrical

Energy storage allow in particular an emergency exit, so that the rotor blades are rotatable by the first control means about their blade axes each in a defined position, which offers as little attack surface for the wind and is also referred to as a flag position.

Preferably, the Blattwinkelverstellantriebe include

Electric motors, which are designed in particular as DC motors or as AC motors. According to one

Embodiment of the invention, the electric motors by means of the first control unit directly or indirectly electrically connected to the one or more energy storage devices. The direct connection is particularly suitable for DC motors. According to a development of the invention

Auxiliary inverter or inverter attached to the rotor, wherein the electric motors by means of the first control unit with the first or the first electrical energy storage under

Intermediate circuit of the auxiliary converter or inverter are electrically connected. This indirect connection is particularly suitable for AC motors. The Blade angle control means may comprise the auxiliary inverters or inverters.

The one or more first energy storage devices are in each case designed in each case as a direct current source. Preferably, the first energy store or stores each comprise at least one

Accumulator, at least one battery or at least one capacitor. Batteries and / or accumulators that can provide the required for the Blattwinkelverstellantriebe electrical power are common

Energy storage. The capacitors include in particular double-layer capacitors, e.g. Ultracaps, where a very high energy density can be achieved. Every one of them

Blattwinkelverstellantriebe are preferably associated with one or more of the first energy storage.

The Blattwinkelverstellantriebe are preferably controllable and / or regulated by means of the second control unit.

In particular, the Blattwinkelverstellantriebe are controlled either by means of the first control unit or by means of the second control unit and / or regulated.

Preferably, the second control unit has one or more inverters, by means of which the

 Blattwinkelverstellantriebe are controllable. In particular, the inverters have one or more

 DC intermediate circuits on. According to one embodiment of the invention, the inverters each have one

DC link on. The inverter (s) are preferably electric with the pitch actuators connected. Furthermore, the converter (s) are preferably electrically connected to the power supply device.

According to one embodiment of the invention, the second control unit has an input stage, which is in particular electrically coupled to the power supply device, depending

Blattwinkelverstellantrieb one with this electrically

connected output stage and one connected between the input stage and the output stages

 DC link arrangement on. Compared to traditional solutions where ever

 Blattwinkelverstellantrieb a separate inverter is provided in this embodiment, a plurality of output stages are coupled to the same DC link arrangement, which is powered by only one input stage. This can save costs. The converter or inverters preferably comprise the input stage, the output stages and the DC link arrangement.

The input stage is preferably a rectifying input stage, so that it acts as a rectifier or can act. Preferably, the input stage comprises an inverter or a power converter, such as an inverter. one

Rectifier. The output stages are preferably controllable. In particular, the output stages each comprise a controllable power converter, e.g. in the form of a transistor stage. Preferably, each of the output stages comprises a plurality of controllable electrical switching elements, preferably to a

Bridge circuit are interconnected. The switching elements are formed for example by transistors, in particular by IGBTs. The second control unit preferably has one or several controls by means of which the output stages are controllable. In particular, one or at least one computer is provided which completely or partially encompasses or forms the controller or the controllers. An advantage over conventional solutions is that one

Realization with only a single computer is possible. The DC link arrangement preferably forms one

DC connection, in particular a DC bus. Each of the Blattwinkelverstellantriebe is preferably associated with one of the output stages, wherein each of the

Blattwinkelverstellantriebe with its associated

Output stage electrically connected and by means of this

controllable and / or controllable.

According to one embodiment of the invention, the

Blattwinkelsteuereinrichtung at least one on

Maschinenträger fastened and electrically coupled to the second control unit second electrical energy storage, by means of which, in particular in a temporary

Impairment of the power supply device and / or the voltage of the network, the Blattwinkelverstellantriebe and / or the second control unit at least temporarily with

electrical energy can be supplied. The second

Energy storage is used in particular at a

temporary break in the mains voltage

 Blattwinkelverstellantriebe continue to operate. Thus, the Blattwinkelverstellantriebe are preferably then controlled by the second control unit and / or

adjustable, if they are supplied by the second energy storage with electrical energy. This is a

Passing through the temporary mains voltage dip possible, which is also referred to as LVRT (low voltage ride through). The second control unit and / or the

Input stage includes in particular switching devices by means of which a temporary power failure, in particular the temporary mains voltage dip, without switching off the wind turbine and / or separation of the wind turbine can be traversed by the network.

Preferably, the second energy storage is electrically connected via the one or more inverters with the Blattwinkelverstellantrieben. In particular, the second energy store with the DC or DC intermediate circuits of or

Inverter electrically connected or connectable. According to one embodiment of the invention, the second energy store is electrically connected to the DC intermediate circuit arrangement

connected or connectable, so the

 Blattwinkelverstellantriebe of the second energy storage with the interposition of the output stages are supplied with electrical energy. The second energy store forms in particular one or at least one DC power source. The second energy store preferably comprises at least one battery, at least one accumulator or at least one capacitor.

The blade angle control device is connected in particular to a wind turbine control, preferably electrically. In particular, the first control unit and / or the second control unit is connected to the wind turbine control. Preferably, by means of the wind turbine control, the entire operation of the wind turbine can be monitored and

controllable. The blade angle control device and / or the second control unit preferably comprises a mains filter, which is fastened in particular to the machine carrier. Preferably, therefore, only a single mains filter is required, which is in particular connected to the wind turbine control. Thus, costs can be saved, since in conventional wind turbines usually each drive is assigned a arranged in the rotor line filter. Also, the

Mains filter are connected to the wind turbine control over relatively simple connections, as they do not have to be led out of the rotating rotor. Furthermore, additional space is created in the rotor.

According to one embodiment of the invention is the

Machine carrier rotatable about a yaw axis on a

Supported supporting structure and rotatable relative to the support structure about the yaw axis by means of at least one yaw drive coupled to a yaw angle control, wherein the second control unit is coupled in particular with the yaw angle control. The connection between the

 Blade angle control and the yaw angle control can be done via a simple interface, since the connection does not have to be led out of the rotating rotor. The yaw drive preferably comprises at least one

AC motor, in particular by the

Yaw angle control is controllable. The supporting structure is in particular a tower.

Preferably, the blade angle adjustment with the

Yaw angle control can be coordinated, in particular a synchronizable with the blade angle adjustment

Yaw angle control possible. According to one embodiment of Invention are the rotor blades in response to a yaw rate or one of these

influencing reference variable rotatable about their blade axes.

According to one embodiment of the invention, the second

Control unit with the Blattwinkelverstellantrieben via

Connected connecting elements, in particular

Include connecting cables. The connecting lines can comprise electrical and / or optical lines.

Preferably, the connection elements comprise one or more communication lines, one or more control lines and / or one or more power supply lines. The one or more control lines preferably comprise one or more electrical lines. The one or more power supply lines preferably comprise one or more electrical lines. The connecting elements preferably comprise a plurality of slip rings, over which the one or more of the connecting lines are guided. The

Slip rings are provided in particular at the separation point between the rotor and the machine carrier. Preferably, the slip rings are arranged on the rotor, in particular on the rotor shaft. The individual slip rings are preferably offset from one another in the direction of the rotor axis. In particular, the one or more control lines and / or the one or more power supply lines are guided over the slip rings. The one or more communication lines preferably comprise one or more optical

Message transmission lines, in particular

Optical fiber. Preferably, the

Connecting elements at least one optical

Coupling device, in particular at the separation point is provided between the rotor and the machine frame. Preferably, the optical coupling device is radially in the middle of

Rotor axis arranged. As optical lines many

Be able to transmit information simultaneously, the connection between the optical coupling device and the second control unit is preferably carried out by only one optical line. Between the optical coupling device and the Blattwinkelverstellantrieben preferably extend a plurality of optical lines.

According to one embodiment of the invention, the

Blattwinkelverstellantriebe preferred one each

Switching device, which is also referred to as a motor panel. The switching devices are in particular with the first control unit and / or with the second control unit

coupled and preferably each comprise one

Measuring device, by means of which at the respective

Blattwinkelverstellantrieb resulting measured values can be detected.

According to one embodiment of the invention include the

Blattwinkelverstellantriebe each at least one

Electric motor with a motor shaft. The electric motors are preferably the above-mentioned electric motors of

Blattwinkelverstellantriebe and can thus as

DC motors or be designed as AC motors. Preferably, the measuring devices each comprise a sensor for detecting the angular position and / or the

Angular velocity of the respective motor shaft. Furthermore, the measuring devices preferably each include one

Sensors for detecting the temperature of the respective The electric motor. According to a development of the invention, the switching devices each comprise one

 Braking device with a brake control for the respective Blattwinkelverstellantrieb and / or electric motor. The

Brake control is preferably coupled to the first control unit and / or to the second control unit. According to one embodiment of the invention, the switching devices are coupled to one another via the communication lines and / or the control lines, in particular directly. Furthermore, the switching devices can each at least one of the first

Energy storage to be assigned.

According to one embodiment of the invention, the first

Control unit associated with a control cabinet, which is preferably arranged radially centered or approximately radially centered in the rotor with respect to the rotor axis. Preferably, the

Control cabinet inner partitions, which divide the interior of the cabinet into several separate areas, which are preferably each bounded by an outer wall of the cabinet, wherein the number of areas corresponds in particular to the number of Blattwinkelverstellantriebe. The inner partitions may e.g. be made mechanically by folding, so that their training no

Welding work is required. The areas are

preferably electrically isolated from each other. Due to the radial central arrangement of the cabinet in the rotor space can be saved, so more space for

Service staff is available. The control cabinet preferably has the shape of a polygon. According to one embodiment of the invention, the control cabinet surrounds the rotor axis. Each of the first energy stores can be on the one

Blattwinkelverstellantrieb arranged and / or fixed, to which it is assigned. In particular, it is possible for each of the first energy stores directly on the respective engine and / or on the respective engine panel

(Switching device) to be flanged. However, the one or more first energy stores are preferably arranged in close spatial proximity to one another and at a distance from the pitch angle adjusting drives. Preferably, the first or the first

Energy storage arranged in the field of the cabinet. In particular, the first energy store (s) are arranged on or in the control cabinet. Preferably, the one or more first energy storage outside the cabinet are attached to the outer wall or outer walls. For the

Service personnel are the first or the first energy storage thus easier to maintain and / or exchange.

The first control unit is arranged in particular in the control cabinet. Preferably, the first control unit comprises a plurality of sub-control units, wherein each of the sub-control units is arranged in one of the areas. Preferably, each of the sub-control units is associated with one of the Blattwinkelverstellantriebe. In particular, the number corresponds to the

Partial control units of the number of

Blade angle adjustment drives.

According to a first variant of the invention, the one or more communication lines, the one or more control lines and the one or more

Supply lines from each of the switching devices or led from each of the Blattwinkelverstellantriebe to the first and / or second control unit. According to a second variant of the invention, the individual switching devices or Blattwinkelverstellanriebe via the one or more communication lines and / or via the one or more control lines in series with each other. In this case it is possible to have one or more

Communication lines and / or the one or more

Control lines of only one of the switching devices or only one of the Blattwinkelverstellantriebe to lead to the first and / or second control unit. However, the one or more supply lines are preferably led to the first and / or second control unit by each of the switching devices or by each of the blade angle adjusting drives.

The term "attached to the rotor" is to be understood in particular such that objects fastened to the rotor are rotatable together with the rotor about the rotor axis

Blattwinkelverstellantriebe. The attachment of the articles to the rotor can be done either directly or indirectly, e.g. over one or more brackets or other

Between elements. Furthermore, the expression "attached to the machine carrier" is to be understood in particular as meaning that

Machine carrier fixed objects are not rotatable together with the rotor about the rotor axis. These items include e.g. the second control unit, the second

Energy storage, the line filter and / or the

Yaw control. The attachment of the objects on Machine supports can each be directly or indirectly, for example via one or more brackets or other intermediate elements. In particular, are attached to the rotor

Objects thus together with the rotor relative to the

Machine carriers mounted objects rotatable about the rotor axis. For example, the first or the first

Energy storage together with the rotor relative to the second energy storage rotatable about the rotor axis.

The invention further relates to a method for adjusting a blade angle of at least one rotor blade of a wind turbine according to the invention by rotating the

Rotor blade about its blade axis, wherein the

 Adjusting the blade angle of the rotor blade selectively by means of the second control unit attached to the machine carrier or by means of the first control unit attached to the rotor. The wind turbine can be named after all

Be further developed refinements.

At the blade angle adjustment by means of the second

Control unit, the blade angle is preferably controlled. In the blade angle adjustment by means of the first control unit, the blade angle is preferably set to a defined

Angle set, which corresponds in particular to the flag position.

According to one embodiment of the invention in the

Blade angle adjustment by means of the first control unit, in particular in the case of a fault, such as in the case of a failure of the power supply device and / or the network, the Blattwinkelverstellantriebe of one or more on the rotor fixed and coupled to the first control unit supplied first electrical energy storage with electrical energy.

According to one embodiment of the invention in the

Pitch adjustment by means of the second control unit, in particular in the event of a fault, such as one

Impairment of the power supply and / or the voltage of the network, the Blattwinkelverstellantriebe of at least one coupled to the second control unit and on

Machine carrier attached second energy storage powered by electrical energy.

Preferably, the blade angle control device has a

Switching device, by means of which a switch from a power supply of the Blattwinkelverstellantriebe by an electrical network to the power supply of

Blattwinkelverstellantriebe by the or

Energy storage takes place.

The invention will be described below with reference to preferred

Embodiments with reference to the drawing

described. In the drawing show:

1 is a schematic representation of a wind turbine according to a first embodiment of the invention,

2 is a partial front view of FIG. 1

apparent rotor, a schematic representation of a

Blade angle control device according to the first

Embodiment, a schematic representation of a motor panel according to the first embodiment, a schematic representation of a

Leaf angle control device according to a second embodiment of the invention, a schematic representation of a

Leaf angle control device according to a third embodiment of the invention, a schematic representation of a

Blade angle control device according to a fourth embodiment of the invention, a perspective view of a

Cabinets according to the first embodiment in the open state, a perspective view of the cabinet of FIG. 8 with mounted batteries and a plan view of the cabinet of FIG. 8 in the closed state and with mounted

Accumulators. From Fig. 1, a wind turbine 1 according to a first embodiment of the invention can be seen, wherein the

Wind turbine 1 comprises a standing on a foundation 2 tower 3, at its end remote from the foundation 2 a nacelle 4 is arranged. The machine house 4 has a machine carrier 5 or is fixed thereto, on which a rotor 6 is rotatably mounted about a rotor axis 7, which has a rotor hub 8 and several connected thereto

Rotor blades 9, 10 and 67 (see Fig. 2) comprises, which are each mounted about a blade axis 11, 12 and 68 (see FIG. 2) rotatably mounted on the rotor hub 8. The rotor blades 9, 10 and 67 extend in the direction of their respective blade axis 11, 12 and 68 away from the rotor hub 8, wherein the blade axes 11, 12 and 68 extend transversely to the rotor axis 7. The rotor 6 is rotated by the wind 13 about the rotor axis 7 and is by means of a rotor shaft 14 with a on the machine frame fifth

fixed electric generator 15 mechanically driven, which is driven by the rotor 6. The generator 15 generates electrical energy and feeds it into an external electrical network 16. The rotor blades 9, 10 and 67 are each rotatable about their respective blade axis 11, 12 and 68 relative to the rotor hub 8 via a Blattwinkelverstellantrieb 17, 18 and 69 respectively. A partial front view of the rotor 6 is shown in FIG. 2.

The machine carrier 5 is rotatably mounted about a yaw axis 19 on the tower 3 and rotatable by means of a yaw drive 20 relative to the tower 3 about the yaw axis 19, which coincides here with the longitudinal axis of the tower 3. The yaw drive 20 is attached by means of a machine carrier 5

Yaw angle control 21 controllable. The Blattwinkelverstellantriebe 17, 18 and 69 are each arranged with a rotor 6 arranged in the first control unit 22 and a fixed to the machine frame 5 second

Control unit 23 connected. The two control units 22 and

23 are part of one of Fig. 3 apparent

Blattwinkelsteuereinrichtung 24. Further, the

Yaw angle control 21 and the blade angle control device

24 with a wind turbine controller 25 electrically

connected according to this embodiment on

Machine carrier 5 is attached. Radial center in the

Rotor hub 8 is attached to this fixed cabinet 26, in which the first control unit 22 is received.

From FIG. 3, the blade angle control device 24

can be seen, wherein the rotor 6 is schematically indicated as a dashed box. The Blattwinkelverstellantriebe 17, 18 and 69 each have an electric motor, wherein the

Electric motor 27 the Blattwinkelverstellantrieb 17, the

Electric motor 28 the Blattwinkelverstellantrieb 18 and the electric motor 29 is assigned to the Blattwinkelverstellantrieb 69. The electric motors 27, 28 and 29 are connected to both the first control unit 22 and the second control unit 23 via a switching device (motor panel) 30 and connecting lines 31, respectively. The connection lines include electrical power supply lines 32,

electrical control lines 33 and communication lines 34, the latter being designed as optical waveguides. The power supply lines 32 and the control lines 33 are about to seated on the rotor shaft 14 slip rings 35 to the second control unit 23 out. The

 On the other hand, communication lines 34 are connected to the second control unit 23 via an optical coupling device 36 (optical interface) arranged on the rotor axis 7. Furthermore, accumulators 37 are shown, which are fastened to the outside of the control cabinet 26 and are electrically connected to the first control unit 22.

The second control unit 23 comprises a rectifier 38, which is connected on the AC side via a mains filter 39 to a power supply device 40, which supplies the second control unit 23 with alternating current and is connected to the network 16. Alternatively, the line filter 39 may also be connected directly to the network 16, so that the

Power supply device 40 is omitted or formed by the network 16.

The rectifier 38 is DC side with a

DC bus 41 connected to the three output stages 42, 43 and 44 are connected. The output stage 42 is connected via the power supply lines 32 of the motor 27 with the associated switching device 30. The

Output stage 43 is connected via the power supply lines 32 of the motor 28 with the associated switching device 30. Further, the output stage 44 via the

Power supply lines 32 of the motor 29 connected to the associated switching device 30. The motor 27 is controllable by the output stage 42, the motor 28 is controllable by the output stage 43, and the motor 29 is controllable by the output stage 44. The rectifier 38 and the DC bus 41 form with each of the output stages, respectively an inverter. Otherwise, however, it could also be said that the rectifier 38, the DC bus 41 and the output stages 42, 43 and 44 form an inverter having three output stages.

The second control unit 23 comprises a controller 45, by means of which the output stages 42, 43 and 44 are controllable. Thus, it is possible to drive the motors 27, 28 and 29 of the pitch actuators 17, 18, and 69 by means of the second control unit 23. Furthermore, at the

DC bus 41 an accumulator 66 connected. Of the

Accumulator 66 may be permanently electrically connected to DC bus 41 or electrically connected to DC bus 41 by controller 45 and / or input stage 38.

With a temporary voltage dip of the network 16, the electrical supply of the DC bus 41 is carried by the accumulator 66. Thus, it is possible to

Blattwinkelverstellantriebe 17, 18, and 69 continue to operate until the voltage dip has passed and the full mains voltage is available again. This has the advantage that the wind turbine 1 during a temporary voltage dip not

must be switched off. Exceeds the duration of the

However, voltage drop for a predetermined period of time or falls below a predetermined threshold, the rotor blades 9, 10 and 67 by means of the first

Control unit 22 is rotated in the so-called flag position. In this case, the power is supplied to the motors 27, 28 and 29 via the accumulators 37. Since it is in the engines 27, 28 and 29 are DC motors, the

Accumulators 37 by means of the first control unit 22 directly to the motors 27, 28 and 29 electrically connected.

Alternatively, the motors 27, 28 and 29 may also be designed as AC motors, so that the connection of the accumulators 37 with the motors 27, 28 and 29 takes place with the interposition of inverters 70, the

are preferably provided in the switching devices 30 (see Fig. 4). Alternatively, however, the inverters may also be provided in the first control unit 22 or connected at a different location between the accumulators 37 and the motors 27, 28 and 29. Thus, the rotor blades can be turned into the flag position even if the second control unit 23 has failed and / or the accumulator 66 has been emptied.

From Fig. 4 is a schematic circuit diagram of the engine 27 associated switching device 30 can be seen, the one

Motor shaft 46 which can be braked and / or held by a braking device 47. The

Brake device 47 is supplied via supply lines 48 with electrical energy, wherein preferably the

Power supply lines 32 include the supply lines 48.

The switching device 30 has a temperature monitoring 49 with a sensor 50 for detecting the temperature of the motor 27, a sensor 51 for detecting the Winkelpositon and angular velocity of the motor shaft 46 and a

Brake control 52, by means of which the braking device 47 is controllable. The monitoring 49, the sensor 51 and the Controller 52 are each electrically connected to an optical communication device 53, which has a

Interface to the communication lines 34 forms.

Furthermore, the inverter 70 is shown, but can be omitted if the motor 27 is designed as a DC motor.

From Figs. 5 to 7 are further embodiments of

Invention, wherein identical or similar features to the first embodiment are denoted by the same reference numerals as in the first embodiment.

From Fig. 5, a Blattwinkelsteuereinrichtung 24 according to a second embodiment of the invention can be seen, wherein the yaw angle control 21 with the second

Control unit 23 is electrically connected. The yaw drive 20 comprises two electric motors 54 and 55 which are each connected to the yaw angle control 21 via an inverter 56 or 57. Furthermore, the yaw angle controller 21 includes a plurality of controllable output stages 58, each with the

DC bus 51 are connected. The output stages 58 are preferably connected to the Blattwinkelverstellantrieben so that they additionally by means of the yaw angle control 21, preferably in response to a yaw movement of

Machine carrier 5 about the yaw axis 19, are controllable.

Furthermore, 5 sensors 59 are shown in FIG

Switching devices 30 are assigned.

6, a blade angle control device 24 according to a third embodiment of the invention can be seen, wherein the accumulators 37 are not connected to the control cabinet 26, but are arranged in the region of or on the motors 27, 28 and 29. Each of the switching devices 30 is assigned to one of the accumulators 37.

From Fig. 7, a Blattwinkelsteuereinrichtung 24 according to a fourth embodiment of the invention can be seen, wherein the arrangement of the accumulators 37 of the third

Embodiment corresponds. Unlike the third

Embodiment is the first control unit 22 but in

Area of or provided on the motor 27, wherein the

Switching devices 30 are connected in series via the communication lines 34 and the control lines 33. With regard to the communication lines 34 and the control lines 33, the assembly effort can thus be reduced.

From Fig. 8 is a perspective view of the

Cabinet 26 according to the first embodiment in

opened state can be seen, wherein the interior of the cabinet is divided by internal partitions 60 into a plurality of areas 61, which further by outer walls 62 of the

Cabinets 26 are limited. Every one of them

Blattwinkelverstellantriebe 17, 18, and 69 is assigned to exactly one of the areas 61. The first control unit 22 comprises one pitch control unit 64 per pitch control (see FIG. 9), wherein each of the pitch units 64 is disposed in one of the areas 61. On the outer sides of the outer walls 62 brackets 63 are attached, to which the accumulators 37 can be mounted. A perspective view of the control cabinet 26 with mounted accumulators 37 is shown in FIG. 9, in which also the partial control units 64 arranged in the areas 61

are indicated schematically. Every one of them

Blattwinkelverstellantriebe are two of the

Accumulators 37 associated with which are arranged on the outer wall 62 of the respective region 61. A plan view of the control cabinet 26 with accumulators 37 mounted is shown in FIG. 10, wherein the control cabinet 26 is closed by a cover 65.

Reference sign list

1 wind turbine

 2 foundation

 3 tower

 4 machine house

 5 machine carriers

 6 rotor

 7 rotor axis

 8 rotor hub

 9 rotor blade

 10 rotor blade

 11 leaf axis

 12 leaf axis

 13 wind

 14 rotor shaft

 15 electric generator

 16 electrical network

 17 blade angle adjustment

18 blade angle adjustment

19 yaw axis / tower axis

 20 yaw drive

 21 yaw angle control

 22 first control unit

 23 second control unit

 24 leaf angle control device

25 wind turbine control

26 control cabinet

 27 electric motor

28 electric motor electric motor

Switching device / motor panel

interconnectors

Power lines

control lines

communication lines

slip rings

optical coupling device

accumulator

rectifier

Line filter

Power supply means

DC Bus / DC Link Circuit Output Stage

output stage

output stage

control

motor shaft

braking device

supply lines

temperature monitoring

temperature sensor

Position and speed sensors

brake control

optical communication device

electric motor

electric motor

inverter

inverter

output stage

Sensors of the switching device Inner partition of the control cabinet Area of the control cabinet interior Exterior of the control cabinet

Holder for accumulator

Part controller

Cover of the control cabinet

accumulator

rotor blade

blade axis

Blattwinkelverstellantrieb

inverter

Claims

Wind turbine claims 1st wind turbine with a machine carrier (5), a rotor (6) rotatably mounted on the machine carrier (5) and rotatable by wind (13) about the rotor axis (7) about a rotor axis (7), comprising a rotor hub (8) and a plurality of rotor blades (9, 10) each extending in the direction of a transverse or substantially transversely to the rotor axis (7) extending blade axis (11, 12) and about their respective blade axis (11, 12) rotatably mounted on the rotor hub (8), on the rotor (6) arranged Blattwinkelverstellantrieben (17, 18), by means of which the rotor blades (9, 10) to their Blade axes (11, 12) are rotatable, at least one blade angle control device (24), coupled to the blade angle adjustment drives (17, 18), by means of which the blade angle adjustment drives (17, 18) are controllable, at least one with the rotor (6) mechanically coupled and driven by this electric generator (15), by means of which electrical energy can be generated, characterized in that the blade angle control means (24) comprises a plurality of each coupled to the pitch control actuators (17, 18) Control units (22, 23), of which a first Control unit (22) on the rotor (6) and a second control unit (23) on the machine carrier (5) is attached. 2. Wind power plant according to claim 1, characterized in that the blade angle control device (24) comprises one or more first electrical energy stores (37) attached to the rotor (6) and electrically coupled to the first control unit (22), by means of which the blade angle adjustment drives (17, 18) at least temporarily with electrical energy are available. 3. Wind power plant according to claim 2, characterized in that the Blattwinkelverstellantriebe (17, 18) comprise electric motors (27, 28, 29) which are directly or indirectly electrically connected by means of the first control unit (22) with the one or more energy storage devices (37). 4. Wind power plant according to claim 3, characterized in that  Auxiliary converter or inverter (70) on the rotor (6) are fixed, wherein the electric motors (27, 28, 29) by means of the first control unit (22) with the or the first Energy storage (37) with the interposition of Auxiliary converter or inverter (70) are electrically connected. 5. Wind power plant according to one of claims 2 to 4, characterized in that the one or more first energy stores (37) each comprise at least one accumulator or at least one capacitor. 6. Wind power plant according to one of the preceding claims, characterized in that the Blattwinkelverstellantriebe (17, 18) optionally by means of the first control unit (22) or by means of the second Control unit (23) are controllable or controllable. 7. Wind turbine according to one of the preceding claims, characterized in that the second control unit (23) has one or more inverters, by means of which the Blattwinkelverstellantriebe (17, 18) are controllable. 8. Wind turbine according to one of the preceding claims, characterized in that the second control unit (23) is a rectifying one Input stage (38), each Blattwinkelverstellantrieb (17, 18) having an electrically connected thereto output stage (42, 43, 44) and one between the input stage and the Output stages switched DC link assembly (41). 9. Wind power plant according to one of the preceding claims, characterized in that the blade angle control device (24) at least one attached to the machine carrier (5) and with the second Control unit (23) electrically coupled second electrical energy store (66), by means of which the Blattwinkelverstellantriebe (17, 18) at least temporarily supplied with electrical energy. 10. Wind power plant according to claims 7 and 9, characterized in that the second energy store (66) can be electrically connected via the converter (s) to the blade angle adjustment drives (17, 18). 11. Wind power plant according to claims 8 and 9, characterized in that the second energy store (66) with the  DC link assembly (41) is electrically connected or connectable, so that the Blattwinkelverstellantriebe (17, 18) of the second energy storage (66) under Intermediate circuit of the output stages (42, 43, 44) can be supplied with electrical energy. 12. Wind power plant according to one of claims 9 to 11, characterized in that the second energy store (66) comprises at least one accumulator or at least one capacitor. 13. Wind turbine according to one of the preceding claims, characterized in that the blade angle control device (24) an on Machine carrier (5) fixed grid filter (39). 14. Wind power plant according to one of the preceding claims, characterized in that the machine carrier (5) is mounted rotatably about a yaw axis (19) on a support structure (3) and is coupled by means of at least one yaw angle control (21) Yaw drive (20) relative to the support structure (3) to the Yaw axis (19) is rotatable, wherein the second control unit (23) is coupled to the yaw angle control (21). 15. Wind turbine according to one of the preceding claims, characterized in that the second control unit (23) with the Blattwinkelverstellantrieben (17, 18) via Connecting elements (31) is connected, the Communication lines (34), electrical control lines (33) and electrical power supply lines (32). 16. Wind power plant according to claim 15, characterized in that the communication lines (34) optical Messaging lines include. 17. Wind turbine according to one of the preceding claims, characterized in that the Blattwinkelverstellantriebe (17, 18) each having a measuring device comprising switching means (30) which is coupled to both the first control unit (22) and with the second control unit (23). 18. Wind power plant according to claim 17, characterized in that the Blattwinkelverstellantriebe (17, 18) each comprise at least one electric motor with a motor shaft (46), wherein the measuring means each comprise a sensor (51) for Detection of the angular position and angular velocity of the respective motor shaft (46) and a sensor (50) for Recording the temperature of the respective electric motor include. 19. Wind power plant according to claim 17 or 18, characterized in that the switching devices (30) each have a braking device (47) with a brake control (52) for the respective Blattwinkelverstellantrieb (17, 18), which with both the first control unit (22) and the second Control unit (23) is coupled. 20. Wind power plant according to one of claims 17 to 19 and according to claim 15 or 16, characterized in that the switching devices (30) are coupled to one another via the communication lines (34) and the control lines (33). 21. Wind power plant according to one of claims 17 to 20 and according to one of claims 2 to 5, characterized in that the switching devices (30) is assigned in each case at least one of the first energy store (37). 22. Wind power plant according to one of the preceding claims, characterized in that the first control unit (22) a control cabinet (26) is assigned, which is arranged with respect to the rotor axis (7) radially in the middle of the rotor (6). 23. Wind power plant according to claim 22, characterized in that the control cabinet (26) has internal partitions (60) which divide the interior of the control cabinet (26) into a plurality of separate areas (61), each through an outer wall (62) of the control cabinet (26) are limited, wherein the number of areas (61) of the number of Blattwinkelverstellantriebe (17, 18). 24. Wind power plant according to claim 23, characterized in that the areas (61) are electrically isolated from each other. 25. Wind turbine according to one of claims 2 to 5, characterized in that the first or the first energy store (37) in close spatial proximity to each other and at a distance from the  Blattwinkelverstellantrieben (17, 18) are arranged. 26. Wind power plant according to one of claims 22 to 24 and according to claim 25, characterized in that the one or more first energy storage devices (37) are arranged on or in the control cabinet (26). 27. Wind power plant according to claim 26, characterized in that the first energy store (s) (37) outside of Cabinets (26) are attached to the outer walls (62). 28. A method for adjusting a blade angle of at least one rotor blade of a wind turbine according to one of preceding claims by rotating the rotor blade about its blade axis, characterized in that the blade angle adjustment of the rotor blade (9) optionally by means of the second on the machine carrier (5) attached Control unit (23) or by means of the rotor (6) attached to the first control unit (22). 29. The method according to claim 28, characterized in that at the blade angle adjustment by means of the first Control unit (22) the Blattwinkelverstellantriebe (17, 18) of one or more on the rotor (6) attached and with the first control unit (22) coupled to the first electrical energy storage (37) are supplied with electrical energy. 30. The method according to claim 28 or 29, characterized in that at the blade angle adjustment by means of the second Control unit (23) the Blattwinkelverstellantriebe (17, 18) of at least one with the second control unit (23) coupled to the machine carrier (5) fixed second energy storage (66) are supplied with electrical energy. 31. The method according to any one of claims 28 to 30, characterized in that the blade angle control device (24) a Switching device, by means of which a Switching from a power supply of Blattwinkelverstellantriebe (17) by an electrical network (16) on the power supply of the Blattwinkelverstellantriebe (17, 18) by the or the energy storage (37, 66) takes place