Adaptable safety status of wind turbine blades

Abstract

An arrangement (1) for controlling the inflow (57) and outflow (47) of a fluid into and from an expandable container (5) is described, the expandable container (5) being arranged to change the state of an adaptable flow regulating device (15) mounted at a wind turbine rotor blade (12), the arrangement comprising: an inflow valve (3) arranged to control the inflow (57) of a fluid into the container (5); an outflow valve (7) arranged to control the outflow (47) of a fluid from the container (5); wherein the inflow valve (3) and the outflow valve (3') are configured to: inhibit the inflow of a fluid into and / or outflow of a fluid from the container (5) in the event of a safety stop event.

Description

Technical Field

[0001] The present invention relates to an arrangement and method for controlling the inflow and outflow of a fluid into and from an expandable container, the expandable container being arranged to change the state of an adaptable flow regulating device mounted at a wind turbine rotor blade. Furthermore, the present invention relates to a flow regulating system for regulating air flow to a wind turbine rotor blade and further to an adaptable wind turbine rotor blade. Background Art

[0002] A wind turbine rotor blade may be mounted on its surface with an adaptable flow conditioning device, such as a spoiler or a flap. The spoiler may be adjusted in different states of the spoiler. The state of the spoiler may relate to a protrusion height and / or an inclination angle at which the spoiler extends from or is angularly inclined relative to other surface portions of the rotor blade. In general, a flow conditioning device may be considered to include a device that is capable of enhancing the lift coefficient of an airfoil section under certain conditions, for example by increasing the energy level of a boundary layer of the rotor blade.

[0003] EP 1 623 111 B1 discloses a wind turbine blade comprising an adjustable lift adjustment component, which is arranged on or at the surface of the wind turbine blade and extends in the longitudinal direction of the blade, and an actuation component, by which the lift adjustment component can be adjusted and thereby the aerodynamic properties of the blade can be modified. The lift adjustment component comprises one or more flexible flaps.

[0004] US 8 851 840 B2 discloses a wind turbine blade comprising a blade body, and a device for changing the aerodynamic surface or shape of the blade, wherein a pneumatic actuator controls the position and / or movement of the device, wherein there is a pressure chamber positioned within the blade body. The pressure chamber can be pressurized to change the state of the device, thereby changing the aerodynamic surface or shape of the blade.

[0005] US 5 106 265 discloses a wind turbine wing comprising a pneumatically actuated spoiler movable perpendicular to the airflow.

[0006] WO 2018 / 041420 discloses a rotor blade comprising an aerodynamic device for influencing an air flow flowing from a leading edge portion of the rotor blade to a trailing edge portion of the rotor blade, wherein the aerodynamic device is mounted at a surface of the rotor blade and comprises a pneumatic or hydraulic actuator, such as a hose or a cavity, the volume of which depends on the pressure of a fluid present inside the pneumatic or hydraulic actuator.

[0007] When a wind turbine rotor blade is equipped with an adaptable flow conditioning device, such as a spoiler or a flap, in the event of a power failure at the flow conditioning device, the risk of damage to components of the wind turbine may develop. Therefore, an arrangement and a method for controlling the inflow and outflow of a fluid into and from an expandable container, which is arranged to change the state of an adaptable flow conditioning device mounted at a wind turbine rotor blade, wherein in an emergency or in particular in the event of a power failure, a safe state of the flow conditioning device may be ensured.

[0008] In particular, when one or more devices are introduced at a wind turbine rotor blade that may affect the air flow at or near the rotor blade (involving air stall), it may be necessary to define a safe state of the adaptable rotor blade. Otherwise, a worst-case state would need to be considered, such as a complete shutdown in the event of an over speed or a grid drop. Traditionally, active add-ons on the rotor blades, such as spoilers or flaps, may not have been considered with respect to defining a safe state for a wind turbine.

[0009] This need is met by the subject matter of the independent claims. The dependent claims specify particular embodiments of the invention. Summary of the invention

[0010] According to an embodiment of the present invention, an arrangement is provided for controlling the inflow of fluid into and outflow of fluid from an expandable container, the expandable container being arranged to change the state of an adaptable flow regulating device mounted at a wind turbine rotor blade, the arrangement comprising: an inflow valve arranged to control the inflow of fluid into the container; an outflow valve arranged to control the outflow of fluid from the container; wherein the inflow valve and the outflow valve are configured to prohibit the inflow of fluid into and / or outflow of fluid from the container in the event of a safety stop event, in particular including a failure of the power supply to the inflow valve and / or the outflow valve.

[0011] The fail-safe state may be used as a safety critical function. The safe state (or safety stop event) may be triggered, for example, in case of critical operating situations, such as rotor overspeed and / or controller runaway situations where standard controllers cannot be trusted, in particular in order to stop the operation of the wind turbine, including stopping the rotor.

[0012] The arrangement may be implemented, for example, partly in software and / or hardware. The fluid may in particular comprise air, in particular compressed air.

[0013] The expandable container may be configured as a hose or bag, for example having a substantially cylindrical shape. The cross-sectional area of ​​the expandable container may change when the container is expanded or contracted. The expandable container may contact the rear surface or at least a portion of the adaptable flow conditioning device so as to change the position and / or orientation and / or inclination of the airfoil-shaped surface of the adaptable flow conditioning device exposed to the air flow. By expanding / contracting the expandable container, the flow conditioning device may be adapted, i.e. adjusted or changed with respect to its air flow influencing effect.

[0014] The adaptable flow conditioning device may be adapted to deflect the air flow to different extents depending on the state of the flow conditioning device.Thus, the expandable container may be used to adjust the state of the flow conditioning device by expanding / contracting the expandable container to different extents.

[0015] The inflow valve and the outflow valve may include a lumen through which a fluid may flow. The inflow valve and the outflow valve may be arranged to close the lumen or to such an extent that the fluid is prohibited from flowing through the lumen. In the event of a failure in the power supply to the respective valves, the closing of the lumen and thereby prohibiting the fluid from flowing through the respective valves, i.e. the inflow valve and the outflow valve, may be automatically adopted. Thus, in an emergency, in particular in the event of a power supply failure, the expandable container may be maintained in its current state, which is related to the filling degree or pressure or size of the expandable container. Thus, for example, it may be ensured that the adaptable flow regulating device may be maintained in its current state. The current state of the flow regulating device may be particularly associated with an air flow influencing property, such as a driving impact or torque acting on the wind turbine rotor. Thus, by maintaining the state of the flow regulating device in an emergency, in particular in the event of a power supply failure, the effect of the flow regulating device is predictable and defined. Thus, further processes for placing the wind turbine in a safe state may be performed more easily.

[0016] Thus, embodiments of the present invention introduce a safe state for the adaptable flow regulating device in the event of a power outage.

[0017] The adaptable flow conditioning device may for example comprise a spoiler mounted for example at the leading edge or leading edge of the rotor blade, in particular at the suction side. The adaptable flow conditioning device may additionally or alternatively comprise a flap mounted at the trailing edge, in particular at the suction side, of the rotor blade.

[0018] The arrangement may be adapted for controlling more than one adaptable flow conditioning device.In particular, the flow conditioning device may comprise several parts which are mounted along the longitudinal axis of the rotor blade and which may be independently controlled by the arrangement.

[0019] The inflow valve and the outflow valve may be connected directly or indirectly to the (outlet / inlet or generally the opening) of the expandable container. For example, one or more conduits may be between the opening of the container and the corresponding valve.

[0020] In the event of a power failure, the inflow valve and / or the outflow valve may both close (thus inhibiting fluid flow through them). A power supply failure may exist if, for example, the voltage of the power supply drops by, for example, 10% to 100%, or generally when the power supply does not meet the ratings of the respective valves.

[0021] During normal operation the inflow valve and / or outflow valve may be supplied with electrical energy from the local power supply of the wind turbine or from a utility grid to which the wind turbine is connected. A power supply failure may for example be due to a short circuit, to a utility grid failure, or generally to any failure of the wind turbine.

[0022] According to an embodiment of the present invention, the arrangement further includes an inflow conduit connectable to the expandable container; and an outflow conduit connectable to the expandable container, wherein the inflow valve is arranged to control the inflow of fluid into the expandable container via the inflow conduit, and wherein the outflow valve is arranged to control the outflow of fluid from the expandable container via the outflow conduit.

[0023] Inflow conduit and outflow conduit can be directly or via one or more other conduits and can be connected or connected to the expandable container. Inflow valve can be arranged in the inflow conduit or connected to the inflow conduit, and outflow valve can be arranged in the outflow conduit or connected to the outflow conduit. There can be one or more inflow conduits and one or more outflow conduits, which can be equipped with corresponding valves. Providing inflow conduit and outflow conduit can allow for the separate path for expanding the container and for shrinking the container. During the expansion of the container, fluid can flow into the lumen of the container through at least the inflow conduit and the inflow valve. During the shrinkage of the container, fluid can flow out of the lumen of the container at least through the outflow conduit and the outflow valve. Thus, the controlled expansion and contraction of the container is achievable or can be achievable.

[0024] According to an embodiment of the present invention, the arrangement further comprises: an inflow-outflow conduit portion, which can be connected to an inflow-outflow port of the container, the inflow-outflow port allowing inflow and outflow of fluid; and a conduit connector, which is connected to the inflow-outflow conduit portion at one end, wherein the inflow conduit and the outflow conduit are joined at the other end of the conduit connector.

[0025] This container can have a single opening, and this opening can be connected to the inflow-outflow conduit portion.Therefore, this container can only comprise a single inflow-outflow port, thereby simplified this container.At the conduit connector, the lumen of the inflow-outflow conduit portion and the lumen of the inflow conduit and the outflow conduit can be fluidically communicated with each other.Connector can be configured as a T-shaped connector for example, thereby is configured to make three conduit ends engage with each other.Therefore, during the inflow and outflow of fluid in this container or from this container, the inflow-outflow conduit portion can be used collaboratively.Therefore, can simplify this layout.

[0026] According to an embodiment of the invention, the inflow valve and / or the outflow valve comprises a spring element and an electromagnet, wherein the spring element sets the respective valve into a closed state prohibiting a fluid flow unless the electromagnet is actuated by electricity.

[0027] Spring element and electromagnet can contact with blocking element or can change the position of blocking element, and this blocking element can be movably arranged in the tubular cavity of corresponding valve.When blocking element is displaced or moved, the tubular cavity of corresponding valve can be closed or opened, or be arranged in the intermediate state between fully open and fully closed.Electromagnet can be actuated by providing voltage or generally providing electric energy.Spring element can not need any electric energy for operation, but can comprise elastic spring element, and this elastic spring element applies force to blocking element in one direction, so that blocking element is displaced or moves to the position of the tubular cavity of prohibiting fluid flow through corresponding valve.Therefore, safety system can be provided.

[0028] According to an embodiment of the invention, the arrangement further comprises: at least one further inlet valve arranged in series with the inlet valve; and / or at least one further outlet valve arranged in series with the outlet valve.

[0029] When one or more additional inlet valves are arranged in series with the inlet valve, redundancy can be provided to ensure reliable operation in the event of a power outage, because when one of the inlet valves fails, one or more other inlet valves arranged in series can still operate, thereby ensuring that fluid flow is prohibited in the event of a power failure.

[0030] According to an embodiment of the invention, the arrangement further comprises: at least one still further inlet valve arranged in parallel with the inlet valve; and / or at least one still further outlet valve arranged in parallel with the outlet valve.

[0031] When one or more inlet devices or outlet devices are arranged in parallel, filling or emptying of the container can be ensured since redundancy for filling or emptying the container can be provided.

[0032] According to an embodiment of the invention, the arrangement further comprises at least one pressure sensor, in particular arranged between the expandable container and the inflow valve and / or the outflow valve, further in particular arranged to measure the fluid pressure at the catheter connector.

[0033] The pressure sensor may allow for a suitable control of the valve. In particular, the state of the adaptable flow regulating device may be related to the pressure within the expandable container or may even be defined by the pressure within the expandable container. Thus, by taking into account the measured values ​​of the pressure sensor, the state of the adaptable or expandable container and thereby the state of the flow regulating device may be inferred. Furthermore, one or more leaks in one or more conduits may be detected.

[0034] According to an embodiment of the invention, the arrangement further comprises a fluid supply system adapted to generate pressurized fluid, supply the pressurized fluid to the inlet valve, and receive fluid from the container via the outlet valve.

[0035] The fluid supply system may be adapted to provide pressurized fluid for inflating the expandable container, and also to receive fluid expelled from the container while deflated.

[0036] According to an embodiment of the present invention, the arrangement further includes: a first fluid control volume (e.g., a first fluid reservoir) (e.g., for high-pressure fluid); a second fluid control volume (e.g., a second fluid reservoir) (e.g., for low-pressure fluid); for example a catheter system; a fluid pump, which is arranged between the first control volume and the second control volume, wherein the fluid received from the container via the outlet valve is directed to the second control volume, wherein the fluid pump is arranged to pump the fluid from the second control volume to the first control volume, thereby increasing the pressure of the fluid.

[0037] The first and second reservoirs are optional features and therefore may not be included in the arrangement according to the embodiment.

[0038] Advantageously, when the expandable container is deflated, the expelled fluid may be recirculated by storing it in a second fluid reservoir. The pump may advantageously pressurize or pump the fluid from the second reservoir to the first reservoir, which may then be used later to inflate the expandable container. The fluid supply system may be partially or fully located in a hub of the wind turbine to which a plurality of rotor blades are mounted.

[0039] According to an embodiment of the invention, the arrangement further comprises at least one further fluid supply system which is configured similarly or identically to the fluid supply system and which is connected in parallel to the fluid supply system.

[0040] In case of a failure of the (first) fluid supply system, the further fluid supply system may serve as a redundant fluid supply system.

[0041] According to an embodiment of the present invention, a flow conditioning system for regulating the air flow at a wind turbine rotor blade is provided, comprising: an adaptable flow conditioning device, in particular a spoiler or a flap, which has an airfoil-shaped surface exposed to the air flow and can be installed at the wind turbine rotor blade; an expandable container, which is arranged to change the position and / or orientation and / or inclination of the airfoil-shaped surface; and an arrangement according to one of the aforementioned embodiments connected to the expandable container.

[0042] Thus, in the event of a fault, in particular a power fault, a safe state of the flow regulating system can be defined and implemented.

[0043] The expandable container may be arranged in the rotor blade. For example, the inflow-outflow conduit portion may be connected to the inflow conduit and the outflow conduit at one end via a conduit connector which may be located in the hub. At the other end, the inflow-outflow conduit portion may be connected to the inflow-outflow port of the container located in or at the rotor blade in order to change the state of the flow conditioning device.

[0044] According to an embodiment of the present invention, there is provided an adaptable wind turbine rotor blade, comprising: a rotor blade; and a flow conditioning system according to the above-mentioned embodiment.

[0045] It should be understood that the features described, disclosed, explained or provided, alone or in any combination, for an arrangement for controlling the inflow and outflow of fluid into and from an expandable container, wherein the expandable container is arranged to change the state of an adaptable flow regulating device and is stored at a wind turbine rotor blade, may also be applied, alone or in any combination, to the corresponding methods mentioned below.

[0046] According to an embodiment of the present invention, a method for controlling the inflow of fluid into and outflow of fluid from an expandable container is provided, wherein the expandable container is arranged to change the state of an adaptable flow regulating device installed at a wind turbine rotor blade, the method comprising: controlling the inflow of fluid into the container by an inflow valve; controlling the outflow of fluid from the container by an outflow valve; and prohibiting the inflow of fluid into and / or outflow of fluid from the container in the event of a failure in the power supply to the inflow valve and / or the outflow valve.

[0047] The present invention is not limited to the described or illustrated embodiments. From the examples of embodiments to be described hereinafter, the above defined aspects and further aspects of the present invention are apparent and will be explained with reference to the examples of embodiments. The present invention will be described in more detail hereinafter with reference to the examples of embodiments, but the present invention is not limited to these examples. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 schematically illustrates an arrangement for controlling the inflow and outflow of a fluid into and from an expandable container according to an embodiment of the invention, the expandable container being arranged to change the state of an adaptable flow conditioning device mounted at a wind turbine rotor blade, the arrangement being adapted to perform a method according to an embodiment of the invention; and

[0049] Figure 2 An adaptable wind turbine rotor blade according to an embodiment of the invention is schematically illustrated, comprising a flow conditioning system according to an embodiment of the invention. DETAILED DESCRIPTION

[0050] Figure 1Schematically illustrated is an arrangement 1 for controlling the inflow and outflow of a fluid into and from an expandable container 5, which is arranged to change the state of an adaptable flow regulating device mounted at a wind turbine rotor blade, according to an embodiment of the present invention. Thus, the arrangement 1 comprises an inflow valve 3, which is arranged to control the inflow of a fluid into the expandable container 5. Furthermore, the arrangement 1 comprises an outflow valve 7, which is arranged to control the outflow of a fluid from the expandable container 5.

[0051] The inflow valve 3 and the outflow valve 7 are configured to inhibit the flow of fluid into and / or out of the container 5 in the event of a failure in the power supply to the inflow valve 3 and / or the outflow valve 7 .

[0052] Arrangement 1 is included in Figure 2 In the adaptable wind turbine rotor blade 10 schematically illustrated in FIG. 1 , the arrangement 1 is actually arranged in a hub 11 to which the adaptable wind turbine rotor blade 10 is connected.

[0053] The adaptable wind turbine rotor blade 10 comprises a bare rotor blade 12 having a rotor blade surface 13 at which an adaptable flow conditioning device 15 is mounted. In particular, the rotor blade 10 comprises a leading edge 17 and a trailing edge 19 relative to a flow direction of an air flow 21. The rotor blade 10 is mounted with an adaptable flow conditioning device 15 at the surface 13 or generally at the rotor blade 10. In the illustrated embodiment, the flow conditioning device 15 comprises or is a spoiler mounted at or near the leading edge 17, in particular at the suction surface 13 of the rotor blade 10.

[0054] The adaptable flow conditioning device 15 can be set in different states by expanding or contracting the expandable container 5 mounted below the airfoil-shaped surface 23 of the flow conditioning device 15. When expanding or contracting the expandable container 5, the airfoil-shaped surface 23 of the flow conditioning device 15 changes inclination and / or position and / or orientation so as to deflect the air to different degrees. Thereby, the aerodynamic properties of the rotor blade 10 are changeable or adaptable.

[0055] The bare rotor blade is marked with reference 12. The flow conditioning system 25 comprised in the adaptable rotor blade 10 comprises an adaptable flow conditioning device 15, an expandable container 5 and an arrangement 1 for controlling the inflow of fluid into and outflow of fluid from the expandable container 5.

[0056] refer to Figure 1The arrangement 1 which can be mounted in the hub 11 comprises in the illustrated embodiment an inflow conduit 27 which can be connected to the container 5. Furthermore, the arrangement 1 comprises an outflow conduit 29 which can be connected to the expandable container 5.

[0057] In particular, the inflow valve 3 is arranged to control the inflow of fluid into the expandable container 5 via the inflow conduit 27, and the outflow valve 7 is arranged to control the outflow of fluid from the expandable container 5 via the outflow conduit 29. In the illustrated embodiment, the arrangement 1 further comprises an inflow-outflow conduit portion 31, 33, from which a section 33 is connected to an inflow-outflow port 35 of the container 5, the inflow-outflow port 35 allowing the inflow and outflow of fluid. Another section 31 of the inflow-outflow conduit portion is connected at one end to a conduit connector 37, wherein the inflow conduit 27 and the outflow conduit 29 are joined at the other end at the conduit connector 37.

[0058] In particular, in the illustrated embodiment, the further inlet valve 3' is connected in parallel with the inlet valve 3, i.e. in the further inlet conduit 27'. In the illustrated embodiment, the outlet conduit 29 is connected or joined at a further conduit connector 37', to which the further inlet conduit 27' is also connected.

[0059] In the illustrated embodiment, the arrangement 1 further comprises a still further outlet valve 7' connected in series with the outlet valve 7, ie arranged in the outlet conduit 29. The still further outlet valve 7' connected in series may provide redundancy and thus safety in case the outlet valve 7 fails.

[0060] The arrangement 1 comprises at least one pressure sensor 39, in particular several pressure sensors 39, which can be mounted on catheter at different locations in the system.

[0061] The illustrated embodiment of the arrangement 1 further comprises a fluid supply system 40 adapted to generate pressurized fluid, supply the pressurized fluid to the inlet valves 3, 3', and receive fluid from the container 5 via the outlet valves 7, 7'. In particular, the fluid supply system 40 comprises a first fluid reservoir 41 for storing high-pressure fluid, a second fluid reservoir 43 for storing low-pressure fluid, and a pump 45 arranged between the first reservoir 41 and the second reservoir 43.

[0062] Fluid 47 received from the container 5 via the outlet valve 7, 7' is directed towards the second reservoir 43. The fluid pump 45 is arranged to pump fluid 49 from the second reservoir 43 to the first reservoir 41, thereby increasing the pressure of the fluid.

[0063] In the illustrated embodiment, the arrangement 1 further comprises a further fluid supply system 40 ′, which may be configured similarly or identically to the fluid supply system 40 , and therefore will not be described in detail again.

[0064] The fluid supply system 40 comprises a valve 51 which allows, for example, venting of the exhausted fluid 49 to the environment 53. The supply system 40 comprises an overpressure valve 55. To inflate the expandable container, a pressurized fluid 57 from the first reservoir 41 can be directed to the fluid port 35 of the container and into the container 5 via the valve 59 and via at least one inlet valve 3, 3', via the inlet conduit 27, 27' and via the inflow-outflow conduit portions 31, 33.

[0065] The inflow valves 3 , 3 ′ and the outflow valves 7 , 7 ′ each comprise a spring element 61 and an electromagnet 63 , wherein the spring element 61 sets the corresponding valve into a closed state prohibiting fluid flow unless the electromagnet 63 is actuated by electricity.

[0066] exist Figure 1 In the embodiment illustrated in , a situation during a power failure is illustrated, wherein all valves 3, 3', 7, 7' are in a closed state prohibiting fluid flow. According to an embodiment of the present invention, valves are provided that block air flow when they are de-energized. In this case, during an emergency shutdown or power-down event, the adaptable flow regulating device 15 will remain in its current position (activated position or state).

[0067] An embodiment of the present invention introduces a defined safety state for an adaptable flow regulating device. The valves, in particular the inflow valves 3, 3' and the outflow valves 7, 7', can put the system into a safe state when they are de-energized. Different kinds of redundancy of valves and ducts can be provided, such as a parallel connection or a series connection of several valves. According to an embodiment of the present invention, the safety pitch and the safety state of the adaptable flow regulating device can be combined to realize a safe stop function of a wind turbine. As an advantage, the defined or predictable loads in the event of an emergency stop or power failure can be reduced, as they do not need to be considered as activation of the worst case.

[0068] Thus, embodiments of the present invention may enable that when an emergency stop is actuated, the actuator system (for an adaptable flow regulating device) may switch into a specific state, or it may maintain the state it currently has.

[0069] It should be noted that the term "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality. Moreover, elements described in association with different embodiments may be combined. It should also be noted that the reference numerals in the claims should not be interpreted as limiting the scope of the claims.

Claims

1. An arrangement (1) for controlling the inflow (57) and outflow (47) of a fluid into and from an expandable container (5), the expandable container (5) being arranged to change the state of an adaptable flow conditioning device (15) mounted at a wind turbine rotor blade, the arrangement comprising: an inflow valve (3) arranged to control an inflow (57) of fluid into the container (5); an outflow valve (7) arranged to control the outflow (47) of fluid from the container (5); The inlet valve (3) and the outlet valve (7) are configured to prohibit the fluid from flowing into and out of the container (5) in the event of a safety stop event so that the adaptable flow regulating device remains in a corresponding state.

2. The arrangement according to claim 1, further comprising: an inflow catheter connectable to the expandable container (5); as well as an outflow conduit (29) connectable to said expandable container (5), wherein the inflow valve (3) is arranged to control the inflow (57) of fluid into the expandable container (5) via the inflow conduit, The outflow valve (7) is arranged to control the outflow (47) of fluid from the expandable container (5) via the outflow conduit (29).

3. The arrangement according to claim 2, further comprising: an inflow-outflow conduit portion connectable to an inflow-outflow port (35) of the container (5) to allow inflow and outflow of fluid; as well as a conduit connector (37) connected at one end to the inflow-outflow conduit portion, The inflow conduit and the outflow conduit (29) are joined at the other end of the conduit connector (37).

4. An arrangement according to any one of claims 1 to 3, wherein the inlet valve (3) and / or the outlet valve comprises a spring element (61) and an electromagnet (63), wherein the spring element sets the corresponding valve to a closed state prohibiting fluid flow unless the electromagnet is actuated by electricity.

5. The arrangement according to any one of claims 1 to 3, further comprising: at least one further inlet valve arranged in series with the inlet valve; and / or At least one further outlet valve (7') is arranged in series with the outflow valve.

6. The arrangement according to any one of claims 1 to 3, further comprising: at least one further inlet valve arranged in parallel with the inlet valve (3); and / or At least one further outlet valve is arranged in parallel with the outflow valve.

7. The arrangement according to any one of claims 1 to 3, further comprising: At least one pressure sensor (39), arranged between the expandable container (5) and the inflow valve (3) and / or the outflow valve (7), is further arranged to measure the fluid pressure at the catheter connector.

8. The arrangement according to any one of claims 1 to 3, further comprising: A fluid supply system (40) adapted to: Generates pressurized fluid, supplying pressurized fluid to the inlet valve, Fluid is received from the container via the outflow valve.

9. The arrangement of claim 8, wherein the fluid supply system comprises: a first fluid control volume (41); a second fluid control volume (43); a fluid pump (45) arranged between the first fluid control volume and the second fluid control volume, wherein the fluid received from the container via the outflow valve is directed to the second fluid control volume (43), Wherein, the fluid pump (45) is arranged to pump the fluid from the second fluid control volume (43) to the first fluid control volume (41), thereby increasing the pressure of the fluid.

10. The arrangement of claim 8, further comprising: At least one further fluid supply system (40') is connected in parallel to the fluid supply system (40).

11. An arrangement according to any one of claims 1 to 3, which can be arranged in a hub (11) of a wind turbine.

12. A flow conditioning system (25) for conditioning air flow at a wind turbine rotor blade, comprising: An adaptable flow conditioning device (15) having an airfoil-shaped surface (23) exposed to an air flow (21) and mountable at a wind turbine rotor blade; an expandable container (5) arranged to change the position and / or orientation and / or inclination of said airfoil shaped surface (23); as well as An arrangement (1) according to any one of the preceding claims connected to the expandable container.

13. The flow conditioning system according to claim 12, wherein the expandable container (5) is arranged within a rotor blade.

14. The flow regulation system of claim 12, wherein: The adaptable flow conditioning device (15) is a spoiler or a flap.

15. An adaptable wind turbine rotor blade comprising: Rotor blades; as well as A flow regulating system (25) according to any one of claims 12 to 14.

16. A method of controlling the inflow and outflow of a fluid into and from an expandable container (5), the expandable container (5) being arranged to change the state of an adaptable flow conditioning device (15) mounted at a wind turbine rotor blade, the method comprising: Controlling the inflow (57) of fluid into the container (5) by means of an inflow valve (3); Controlling the outflow (47) of fluid from the container (5) by means of an outflow valve (7); In the event of a safety stop event, fluid is prohibited from flowing into and out of the container (5) so that the adaptable flow regulating device remains in a corresponding state.

Images