WO2012003940A1 - Procédé et dispositif permettant de produire un signal de correction d'angle d'incidence pour au moins une pale de rotor d'une éolienne - Google Patents

Procédé et dispositif permettant de produire un signal de correction d'angle d'incidence pour au moins une pale de rotor d'une éolienne Download PDF

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Publication number
WO2012003940A1
WO2012003940A1 PCT/EP2011/003244 EP2011003244W WO2012003940A1 WO 2012003940 A1 WO2012003940 A1 WO 2012003940A1 EP 2011003244 W EP2011003244 W EP 2011003244W WO 2012003940 A1 WO2012003940 A1 WO 2012003940A1
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WO
WIPO (PCT)
Prior art keywords
rotor
deflection
rotor blade
blade
pitch
Prior art date
Application number
PCT/EP2011/003244
Other languages
German (de)
English (en)
Inventor
Felix Hess
Martin Voss
Boris Buchtala
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2012003940A1 publication Critical patent/WO2012003940A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/022—Adjusting aerodynamic properties of the blades
    • F03D7/0224—Adjusting blade pitch
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/80—Diagnostics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2270/00—Control
    • F05B2270/80—Devices generating input signals, e.g. transducers, sensors, cameras or strain gauges
    • F05B2270/804—Optical devices
    • F05B2270/8041—Cameras
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the present invention relates to a method and a device for providing a pitch correction signal for a rotor blade of a wind turbine according to the independent claims.
  • the circle of rotor blades of a wind rotor is usually unevenly traversed by wind during its operation. This results in the course of a rotor rotation variable wind forces on the rotor blades of a wind turbine.
  • the speed above the nominal wind speed is controlled by synchronous adjustment of the blade angle, that is changed by changing the angle of attack of the aerodynamic lift and thus the drive torque in such a way that the system held in the range of rated speed can be.
  • pitch and yaw moments on the nacelle arise due to asymmetric aerodynamic loads.
  • the asymmetric loads are caused, for example, by wind shear in the vertical direction, such as boundary layers, yaw angle errors, gusts and turbulence or impoundment of the flow at the tower.
  • One approach to reducing these asymmetric aerodynamic loads is to individually adjust the pitch of the blades (Individual Pitch Control, IPC).
  • IPC Intelligent Pitch Control
  • sensors are mounted in or on the rotor blades to measure the blade bending moments.
  • the bending moments then serve as a control variable for the individual Blattver- position.
  • Other methods determine the pitch and yaw moments by measuring the gondola acceleration via gyrometer. For this regulation, the sheet bending moments are very well suited as a controlled variable. However, it has not yet been possible to find suitable measuring technology for continuous use.
  • Fiber Bragg sensors for measuring moments laminated to the blades can not be replaced in the event of a defect; bonded strain gage sensors have a very short service life. Both methods additionally have the problem that the measurement takes place only locally on the sheet. Local inhomogeneities in the laminate therefore lead to measurement errors. A conclusion on the global state of tension in the blade root and thus the moment acting there is always fraught with errors.
  • the document WO 2008 041066 A I describes such a regulation, which uses measured moments for a regulation of the individual angles of incidence of the blades of a wind rotor of a wind turbine as a controlled variable.
  • the document DE 197 39 164 A I describes a wind power plant, which individually adjusts the rotor blades for a compensation of the yawing and pitching moments of the rotor of the wind turbine and used in the individual rotor blade introduced strain gauges to determine the acting moments. It is the object of the present invention to provide an improved method and apparatus for providing a pitch correction signal for a rotor blade of a wind turbine.
  • the present invention is based on the finding that a rotor blade reacts to the variable wind forces with a deflection that is influenced by the material characteristics of the rotor blade. This deflection is directly related to the resulting momentum at the leaf root.
  • a measurement of the current deflection about an axis at a known, predefined location of a rotor blade allows conclusions to be drawn about the moment at the blade root currently acting around this axis. For this reason, from the easy and reliable deflection to be determined, a conclusion can be drawn about the moment at the blade root or the pitch correction signal can be determined on the basis of the deflection.
  • the invention comprises a method for correcting a desired angle of attack signal of a rotor blade of a wind turbine, wherein the desired pitch signal represents a common angle of attack, which was determined for a plurality of rotor blades, the method comprising the following steps:
  • the signals representing the desired angle of attack are additively superimposed on the signals representing the pitch correction component for the respective blade in order to obtain a corrected desired angle of attack or a corresponding signal.
  • the invention provides an apparatus for providing a Anstellwinkelkorrektursignals for at least one rotor blade of a wind turbine, wherein the wind power plant at least one, about a rotor axis and 'a blade longitudinal axis rotatable rotor blade, with a structure rotor plane spans as imaginary auxiliary plane substantially perpendicular to the rotor axis
  • the apparatus comprising comprising: means for providing a displacement signal representative of a current deflection of the rotor blade from the design plane of the rotor, the rotor blade experiencing variable deflections from the construction rotor plane during one revolution around the rotor axis; and means for determining a pitch correction signal based on the sweep signal, the pitch correction signal being adapted to achieve deflection of the at least one rotor blade when coupled to a common launch signal for a plurality of rotor blades of the wind turbine, opposite to a previous deflection of that rotor during one revolution about the rotor axis
  • Another advantage is a computer program product with program code for carrying out the presented method, when the program is executed on an information system, a control device or generally speaking on a device.
  • This device may be a computer, a microcontroller or a similar electronic circuit, which is designed for the execution of programs.
  • a wind turbine as used herein also abbreviated as WKA, includes a tower or mast, a generator nacelle, and a rotor.
  • WKA wind turbine
  • the rotor rotates about its axis of rotation, the rotor sweeps over a surface, the circle of revolution.
  • the rotor blades are at an approximately right angle to the axis of rotation of the rotor. Therefore, the blades of the wind turbine move in an ideal state without any force approximately in a construction rotor plane. If the rotor deviates from its ideal shape due to the application of forces such as weight, wind force, acceleration and inertia force, there will be a deviation or deflection on the blades from the design rotor plane. This deviation is measurable.
  • the information about the deviation of a single sheet, multiple sheets or all blades of the rotor can be reproduced in a displacement signal.
  • the pitch correction signal thereby represents the positive or negative angle for a particular rotor blade about which the collective target pitch determined for multiple or all rotor blades of a wind rotor is to be adjusted to match the resulting deflection of the rotor blade to an average multiple blade pitch ,
  • the deflections which are directly related to the resulting moments on the blade root, represent the moment load for the respective rotor blade.
  • the Anstellwinkelkorrektursignal can be determined such that acts on all rotor blades an equal and constant as possible torque, so that the fatigue load of the rotor blades is minimal.
  • Disturbing moments about pitch and yaw axis can be suppressed or at least reduced in this way by the individual adjustment of angles of attack of the different rotor blades.
  • in the step of determining the pitch correction signal is determined from a difference of an average of the variable deflections of the rotor blades represented by the deflection signal and the actual deflection of the one rotor blade.
  • step of providing a signal of a cable sensor can be used to determine the Aüslenkungssignal.
  • a draw wire sensor provides a cost effective way to determine the deflection of a sheet.
  • Optical detection makes it possible to measure the blade deflection free of transmission errors due to irregularities in the material, such as local inhomogeneities on the blade, ie local defects in the laminate.
  • An optical sensor has a much longer life and robustness than conventional strain and strain sensors, since no moving parts can fail due to fatigue.
  • local material defects have no influence on the measurement result, since the measurement takes place over a large portion of the sheet. A global deformation of the sheet is measured.
  • Material properties of the blade are irrelevant, so that aging or stiffness changes due to moisture need not be taken into account. There are no high demands placed on a positioning accuracy. Temperature compensation is unnecessary and there is no drift in the measurement signal.
  • the components for such an embodiment are easy to maintain, calibrate, and recalibrate.
  • a plurality of predefined points of the rotor are detected and detected At least one uniquely identifiable pattern is recognized, wherein the deflection signal is determined using the recognized pattern. Detecting multiple points or a pattern increases the achievable accuracy of the method, since the information content in the jointly detected points is higher by an additional possibility of determining the distances of the points to each other. If one of the points should not be recognizable due to a defect or harmful influences, then in some cases enough points are still detected to be able to provide precise deflection information.
  • the step of providing a camera is used to detect the predefined points and the deflection of the rotor blade is determined due to an arrangement of a plurality of pixels of a pixel image of the camera.
  • a camera for obtaining information can be used cost-effectively and simply.
  • Optically uniform interrelations make it possible to use different camera models. As a result, there is no danger of a spare part shortage if a camera needs to be replaced.
  • the components can be accommodated within a rotor blade, where they are protected against the effects of the weather. Reflective material can be easily retrofitted in or on a rotor blade, so that only a small effort must be operated to allow retrofitting.
  • At least one optical fiber introduced into the rotor blade or attached to the rotor blade is used in the step of providing, which is adapted to move light from a light emitting light source close to the rotor axis to the at least one predefined point .
  • Fiber optic fibers are generally non-conductive for electricity.
  • the method comprises an additional step of determining at least one additional pitch correction signal for a further rotor blade of the wind turbine based on a further deflection signal, influencing an angle of attack about the blade longitudinal axis of at least one further of the rotor blades taking into account the further pitch correction signal, such that a subsequent deflection of the at least one further rotor blade during a rotation about the rotor axis is approximately constant.
  • Such an embodiment of the present invention offers the advantage that by providing angle of attack correcting signals for a plurality of rotor blades, a further improved compensation of the yawing and pitching moments of the wind turbine can be achieved.
  • the pitch correction signal is generated by a pitch yaw
  • Transformation of the deflection signal into a pitch deflection portion and a yaw deflection portion converted.
  • the pitch deflection component is converted to a pitch pitch component and the yaw deflection component is converted to a yaw pitch component.
  • a pitch-yaw inverse transformation of the pitch pitch component and the yaw pitch component into the pitch correction signal is performed.
  • a correction angle for the pitch and yaw axes can be determined in each case via suitable control parameters in order to reduce these yaw and pitch angles.
  • the pitch correction signals for the individual rotor blades can be determined.
  • Such a control does not require a high control speed. Rather, slowly varying deflection differences arise, which are very well suited to adapt a system with high moments of inertia, such as a wind turbine, to an inhomogeneous distribution of the wind power over the circle of flight of the rotor blades.
  • FIG. 1 is a block diagram of an embodiment according to the approach proposed here;
  • FIG. 2a block diagrams of another embodiment according to the here and 2b proposed approach
  • FIG. 3 shows a schematic representation of a front or rear view of an exemplary embodiment of a rotor blade according to the approach proposed here;
  • FIG. 4 shows a diagram for explaining a bending angle detection according to an exemplary embodiment of the approach proposed here
  • FIG. 5 shows a diagram for explaining a deflection detection according to an embodiment of the approach proposed here
  • FIG. 6 is a schematic representation of a side view of an embodiment of a rotor blade according to the approach proposed here;
  • Fig. 7a is a schematic representation of a side view of another and 7b exemplary embodiment of a rotor blade according to the approach proposed here;
  • FIG. 9 is a flowchart of an embodiment of the present invention as a method.
  • FIG. 1 shows a first block diagram of an embodiment according to the approach proposed here.
  • a unit 100 for operation determines depending on a current speed n and load of a wind turbine 102 a common setpoint angle ⁇ for all rotor blades of the wind turbine 102.
  • the target angle of attack ⁇ or a corresponding signal is a base size for influencing a blade angle adjustment by a Journal longitudinal axis of each rotor blade of the wind turbine 102 used.
  • the wind turbine 102 comprises a device for providing information xj, x 2 , x 3 via a deflection of the individual of the three rotor blades by attacking wind forces, which passes this information on to a device 104 for determining.
  • a device 104 for determining In the means for determining 104 for each rotor blade to compensate for the different deflections depending Anstellwinkelkorrektursignal ⁇ , ⁇ 2 , ⁇ 3 determined.
  • the Anstellwinkelkorrektursignal ⁇ , ⁇ 2 , ⁇ 3 is outputted by the means for determining 104 and added to the respectively belonging to the rotor blade signal for the Sollanstellwinkel ⁇ and gives the resulting angle of attack ⁇ , ⁇ p 2 , ⁇ 3 , that is one for each one the three rotor blades of the wind turbine 102.
  • the operational management 100 determines the necessary collective setpoint angle ⁇ for all rotor blades of the wind turbine 102 due to a current load situation for the wind turbine 102 in order to maintain a required setpoint speed of the wind turbine 102 within a narrow tolerance range. At the same time, the management 100 influences the current load situation via a torque input corresponding to a current wind speed.
  • Wind attack power causes an oscillating deflection xi, x 2 , x 3 of each individual rotor blade during one revolution.
  • This deflection during one revolution is forwarded to the means 104 for determining 104 as the actual deflection ⁇ ⁇ , x 2 , x 3 of each individual rotor blade by means for providing as a deflection signal xi, x 2 , x 3 .
  • Anstellwinkelkorrektursignale ⁇ , ⁇ 2 , ⁇ 3 are determined in the means for determining 104, an approximation of the individual deflections X
  • the object of the means for determining 104 is to keep the deviations of the rotor blades from a constant and uniform AutomatlenklenkSh small (ideally close to zero) in order to reduce fatigue in the material of the rotor blades by changing loads.
  • the load is reduced for all other components of the wind turbine 102, which support the torque resulting from the variable forces during a revolution.
  • the service life of all components involved increases.
  • the approach presented here has the advantage that the blade deflection is much easier to measure than the blade bending moment. It is sufficient to measure the deflection of any point from the rotor plane, ie the design rotor plane.
  • the blade deflection at the blade tip can be used as a control signal.
  • a certain minimum distance to the blade foot should be maintained in order to obtain sufficiently large and therefore precisely measurable blade deflections.
  • the deflection directly on the blade foot is always zero, so a measurement there meaningless.
  • Sheet deflection measurement methods can be implemented via acceleration sensors in the sheet, or realized by distance measurements such as wire draw sensors or optical range finding.
  • FIGS. 2a and 2b each show a block diagram of a further embodiment according to the approach proposed here.
  • an operating control 100 forwards a desired angle of attack ⁇ according to a current rotational speed n or ⁇ and a current load situation P depending on a current wind speed to a wind turbine 102, as corresponds to a standard control 200.
  • the wind turbine 102 is, as described in Fig. 1, subject to aerodynamic phenomena. This results in different deflections x 1 , x 2 , x 3 on the rotor blades of the wind power plant during one revolution. These are forwarded in a device for providing to a device 201 for transformation.
  • the device 201 for transformation accesses a rotor rotational position ⁇ , which is also output by the wind turbine and which denotes a current angular position of the rotor during one revolution.
  • the different deflections xj, x 2 , x 3 of the rotor blades are converted into values XD and XQ in coordinates of a wind turbine fixed coordinate system.
  • a pitch deflection xo is processed in a controller 202 for the pitch component to a pitch correction portion ⁇ o ⁇ the pitch component.
  • a yaw deflection XQ is processed in a controller 204 (for the yaw component to a Anstellwinkelkorrektursignal A p Q for the yaw component.
  • a device 206 to the inverse transformation then the correction signals for
  • Yaw component Acp Q and pitch component ⁇ again transformed into a rotor-related, ie circulating coordinate system.
  • the means 206 for rearrangement again accesses the signal representing the rotor rotational position or angular position ⁇ .
  • This results in the Anstellwinkelkorrektursignale ⁇ , ⁇ 2 , ⁇ 3 for the individual rotor blades of the rotor, the respective signal for the target Incident angle ⁇ are superimposed and give the resulting signals representing the individual angles of incidence ⁇ , ⁇ 2 , ⁇ 3 .
  • the goal is to minimize asymmetric loads on the rotor.
  • the sheet bending moments in the direction of impact are measured and the asymmetries in the three measured moments are reduced by the IPC controller.
  • the idea of the proposed approach is that sheet bending moments associated with a deflection of the sheet so a deflection in the pan and impact direction.
  • the direction of impact is mainly relevant.
  • the deflection can be used as a control variable for the IPC control. Whether the actual relationship between displacement and load is linear or involves nonlinearities is irrelevant to the goal of reducing asymmetric loads.
  • the only assumption for the method presented here is that the leaves show the same deflection under the same load.
  • the aim of the regulation presented here is that asymmetric deformations are corrected, which means that the deformations of all blades of the wind turbine should be the same.
  • the bending moments measured at the blade root are transformed by the DQ transformation into a stationary coordinate system.
  • the D component, the pitching moment of the rotor, and the Q component, the yaw moment are regulated to zero by a respective controller.
  • the goal is therefore to get the rotor at the hub nick- and yaw moment free.
  • the controllers generate a pitch angle component in the stationary coordinate system.
  • the DQ transformation calculates a deflection in the D direction and a deflection in the Q direction.
  • the two controls now try to settle these two deflections to zero.
  • the D and Q pitch components generated for this purpose are transformed back into the rotating coordinate system by the inverse DQ transformation, ie a DQ "1 transformation, analogously to the method described above, thereby producing individual pitch angles or individual pitch angle correction signals for all three sheets ,
  • a rotor blade 300 has an optical detection device 304 in the region of a blade root or a blade root 302.
  • the optical detection device 304 may detect parts of the rotor blade 300 or on a surface of the rotor blade 300 in a detection area (indicated by dashed lines).
  • the rotor blade 300 has a series of predefined points or dot patterns 306, 308, 310 that are distinguishable by an individual pattern.
  • the predetermined points 306, 308, 310 are located in the detection range of the optical detector 304.
  • the optical detector 304 may be, for example, a camera.
  • the optical detector 304 provides information representing the optical information about the detection area.
  • Information about the predefined points 306, 308, 310 is also contained in the optical information. Leaves the rotor blade 300 by a force of its rest position, so change the optical information that provides the optical detection device 304.
  • a dot pattern representing the information about the predetermined points 306, 308, 310 changes its position within the optical information according to a change in the position of the predefined points 306, 308, 310 with the rotor blade. This change can now be evaluated for providing a deflection information. If a lack of illuminance makes detection of the predetermined points by the optical detection means impractical or impossible, sufficient illumination can be provided by means of a light source 312. It is particularly advantageous if the predefined points 306, 308, 310 have increased visibility.
  • FIG. 4 shows a diagram of a bending angle detection or rotation measurement according to the approach proposed here.
  • An array of predetermined points is shown in two different states 410 and 420.
  • the first state 410 the multiple points 412, 414, 416 and 41 8 are arranged without deflection in a row.
  • the second state 420 the deflection of the points 412, 414, 416 and 41 changes, for example when the row changes its relative angle ot to an initial state.
  • the optically detectable distances of the points 412, 414, 416 and 418 from one another change as a result of the tilting, deflection or rotation of the row according to the relationship I-cosa.
  • the distance 1 of the points is thus shortened by l-cosa.
  • a rotor blade When a rotor blade is exposed to aerodynamic or other forces, it responds to these forces with an evasive movement. Since the rotor blade is firmly clamped to his foot, it can not escape there. As a result of the attacking forces, the rotor blade deforms more and more with increasing distance from the leaf foot. This results in an increasing deviation of the angle of the blade longitudinal axis from the rest position of the blade longitudinal axis. This angular deviation can be determined by evaluating the measurable distances of points 412, 414, 416 and 418 in the image of camera 400 in state 420. The distance of the points is shortened by cos a.
  • a measurement of the blade deflection of a wind turbine by means of a camera, which observed an artificial starry sky in the rotor blade is also possible.
  • the deflection can now be measured by the displacement of the dot pattern by the camera.
  • a simple monochrome fixed focus camera can be used as the camera.
  • the resolution of the camera can be in the range of 1000 x 1000 pixels.
  • the measurement resolution is then determined by the zoom factor of the camera. If, for example, it has an image area of 1 mx 1 m, the measurement resolution for the deflection is 1 mm.
  • Modern image processing algorithms are even subpixel-accurate, so that the resolution can be further increased.
  • the available camera technology is proven and robust. 5 shows a diagram of a deflection detection according to the approach proposed here using a camera.
  • Two pictures sections 500 and 502 of a camera are arranged one above the other, wherein the camera image 500 is recorded in the undeflected state and the camera image 502 is recorded in the deflected state of the rotor blade.
  • the detail 500 shows a group of predefined points 306.
  • the detail 502 shows two groups of predetermined points 306, 308.
  • the group of points 306 has in the detail 502 a displacement 504 in relation to the detail 500.
  • the point group 308 is not visible in the cutout 500, but is visible in the cutout 502 due to the displacement of the groups 306 and 308 and the common arrangement of the points on the rotor blade.
  • this actual shift can be determined.
  • the arrangement of the point groups at different distances from the leaf root results in different shifts of the groups of points.
  • the camera can reproduce these differences and in the step of providing it can output a deflection signal for different distances from the blade root. If one or more of the point groups with the rotor blade should be displaced beyond a detection range of the camera, the distribution of the point groups over the length of the rotor blade ensures that at least one group of points remains detectable in the detection area.
  • FIG. 6 shows a schematic representation of a side view of an exemplary embodiment of a rotor blade according to the approach proposed here.
  • the rotor blade 300 has an optical detection device 304 on its blade foot 302.
  • a plurality of groups of points 306, 308, 310 are distributed over the length of the rotor blade and are located in a detection range of the optical detection device 304.
  • At the foot 302 of the rotor blade 300 there is a light source 600 which via light guides 602 the light from the light source 600 to the point groups 306, 308, 310 directs.
  • the points of the groups of points form free ends of the light guide, from which the light can escape from the light guide into the environment.
  • the emerging light from the ends of the optical fibers 602 forms the distinguishable patterns of the dot groups 306, 308, 310 and is detected by the detector 304.
  • the blade 300 Under the influence of, for example, wind force and gravity, the blade 300 increasingly deforms from the blade foot 302 to the blade tip.
  • the point groups 306, 308, 310 are also progressively changing their position from the blade foot 302 to the tip. This is registered by the optical detection device 304 and from the optical information the deflection signal can be generated in the step of providing.
  • the use of light conductors 602 reduces the sensitivity of the rotor blade 300 to lightning damage, since no electrical lines have to be introduced inside or outside the blade 300.
  • a rotor blade 300 extends in the z direction and has a camera 304 within its blade foot 302.
  • the camera 304 is directed to point groups 306, 308, 310 and can detect them.
  • the leaf foot or blade root 302 also contains a light source 600, for example an LED, which guides the light of the light source 600 to the points 306, 308, 310 via optical fibers 700, for example made of glass fiber.
  • a light source 600 for example an LED, which guides the light of the light source 600 to the points 306, 308, 310 via optical fibers 700, for example made of glass fiber.
  • frames 702 for reinforcing the rotor blade 300.
  • Pan and direction of impact at the point of interest By measuring the star distances, it is also possible to calculate the local bending angle of the rotor blade at the point of interest. If frames in the rotor blade restrict the field of view of the camera, the optical sensor can still measure the deflection, if the starry sky consists of distinguishable groups of points. The twist of the Starry sky can be measured as shown by the shortening of the point distances. This also works for 2-dimensional deflections or twists in the direction of impact and pivoting. The measuring range of the deflection can be considerably larger than 1 m, if the starry sky is correspondingly larger and consists of distinguishable dot patterns.
  • the core of the presented concept is the measurement of the blade deflection of a wind turbine by means of a camera, which observes an artificial starry sky in the rotor blade.
  • a measuring device for this method can be constructed so that all electronic components are mounted directly in the blade base. This allows a protected against lightning installation and easy replacement in case of failure.
  • the light for the dot pattern of the starry sky is generated by a light source, such as a light emitting diode LED, an incandescent lamp or a gas discharge lamp in the leaf root, from which leads one or more optical fibers to the individual luminous points. So there is no need to lay electrical lines in the rotor blade, which can be prone to failure in lightning strikes.
  • the artificial starry sky should be mounted far enough in the rotor blade, so that the deflection of the rotor blade at the measuring point is sufficiently large, so that a shift can be measured.
  • FIG. 8 shows a simplified illustration of the resulting deformation of a wind rotor from the design rotor plane under wind load.
  • a wind turbine 800 with a rotor 802 is acted upon by wind.
  • the rotor 802 is deflected by the wind pressure about a deflection 804 from the design rotor plane 806.
  • the deflection 804 at the blade tip of the rotor 802 is a measure of a moment acting on the blade root. If the distribution of the deflection 804 via the rotor is not uniform, for example higher at the top than at the bottom, a resulting moment acts on the wind power plant 800.
  • the resulting moment disappears on the wind turbine 800.
  • FIG. 9 shows a flow chart of an embodiment of the present invention as a method for providing a pitch correction signal for at least a rotor blade of a wind turbine.
  • the wind turbine on at least two, about a rotor axis and one blade longitudinal axis rotatable rotor blades, as well as a, spanned substantially perpendicular to the rotor axis construction rotor plane.
  • the method includes a step of providing 900 a displacement signal representative of a plurality of actual deflections of the rotor blades from the design rotor plane, the rotor blades experiencing variable deflections from the construction rotor plane during rotation of the rotor blades about the rotor axis.
  • the method comprises a step of determining 902 a Anstellwinkelkorrektursignals starting from the deflection signal, the Anstellwinkelkorrektur- signal is suitable to achieve when linked to a common pitch signal for a plurality of rotor blades deflection of at least one rotor blade, compared to a preceding deflection of this rotor blade is reduced.
  • the exemplary embodiments shown are chosen only by way of example and can be combined with one another.

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  • Wind Motors (AREA)

Abstract

L'invention concerne un procédé permettant de produire un signal de correction d'angle d'incidence pour au moins une pale de rotor (300) d'une éolienne (102), l'éolienne comportant au moins une pale de rotor tournant autour d'un axe de rotor et d'un axe longitudinal de pale, un plan de rotor conceptuel (806) s'étendant en tant que plan auxiliaire imaginaire sensiblement perpendiculairement à l'axe du rotor. Le procédé comprend une étape de lecture (900) d'un signal de déviation (x1) qui représente une déviation réelle de la pale de rotor relativement au plan de rotor conceptuel, la pale de rotor effectuant, lors d'une rotation autour de l'axe du rotor, des déviations variables relativement au plan de rotor conceptuel. Le procédé (900) comprend également une étape de détermination (902) d'un signal de correction d'angle d'incidence (Δφ1) sur la base du signal de déviation, le signal de correction d'angle d'incidence (Δφ1) étant apte, en liaison avec un signal d'angle d'incidence (φ) commun à plusieurs pales de rotor de l'éolienne, à atteindre une déviation d'au moins une pale de rotor qui soit presque constante pendant une rotation autour de l'axe du rotor.
PCT/EP2011/003244 2010-07-07 2011-06-30 Procédé et dispositif permettant de produire un signal de correction d'angle d'incidence pour au moins une pale de rotor d'une éolienne WO2012003940A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010026371.0 2010-07-07
DE102010026371A DE102010026371A1 (de) 2010-07-07 2010-07-07 Verfahren und Vorrichtung zum Bereitstellen eines Anstellwinkelkorrektursignals für zumindest ein Rotorblatt einer Windkraftanlage

Publications (1)

Publication Number Publication Date
WO2012003940A1 true WO2012003940A1 (fr) 2012-01-12

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Application Number Title Priority Date Filing Date
PCT/EP2011/003244 WO2012003940A1 (fr) 2010-07-07 2011-06-30 Procédé et dispositif permettant de produire un signal de correction d'angle d'incidence pour au moins une pale de rotor d'une éolienne

Country Status (2)

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DE (1) DE102010026371A1 (fr)
WO (1) WO2012003940A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19739164A1 (de) 1997-08-25 1999-03-04 Inst Solare Energieversorgungstechnik Iset Windenergieanlage
US20030127862A1 (en) * 2000-03-09 2003-07-10 Roland Weitkamp Control system for a wind power plant
US20060078193A1 (en) * 2004-10-08 2006-04-13 Siemens Westinghouse Power Corporation Method of visually inspecting turbine blades and optical inspection system therefor
WO2008041066A1 (fr) 2006-10-02 2008-04-10 Clipper Windpower Technology, Inc. Éolienne avec commande de pas de pale afin de compenser le cisaillement du vent et le désalignement du vent
WO2009037271A1 (fr) * 2007-09-17 2009-03-26 Schleifring Und Apparatebau Gmbh Capteur à fibres optiques pour mesurer les déformations sur les éoliennes
EP2112373A2 (fr) * 2008-04-22 2009-10-28 REpower Systems AG Procédé de contrôle du fonctionnement d'une éolienne

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19739164A1 (de) 1997-08-25 1999-03-04 Inst Solare Energieversorgungstechnik Iset Windenergieanlage
US20030127862A1 (en) * 2000-03-09 2003-07-10 Roland Weitkamp Control system for a wind power plant
US20060078193A1 (en) * 2004-10-08 2006-04-13 Siemens Westinghouse Power Corporation Method of visually inspecting turbine blades and optical inspection system therefor
WO2008041066A1 (fr) 2006-10-02 2008-04-10 Clipper Windpower Technology, Inc. Éolienne avec commande de pas de pale afin de compenser le cisaillement du vent et le désalignement du vent
WO2009037271A1 (fr) * 2007-09-17 2009-03-26 Schleifring Und Apparatebau Gmbh Capteur à fibres optiques pour mesurer les déformations sur les éoliennes
EP2112373A2 (fr) * 2008-04-22 2009-10-28 REpower Systems AG Procédé de contrôle du fonctionnement d'une éolienne

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