EP3458713A1 - Method for determining vibration of a wind turbine tower - Google Patents
Method for determining vibration of a wind turbine towerInfo
- Publication number
- EP3458713A1 EP3458713A1 EP17724333.4A EP17724333A EP3458713A1 EP 3458713 A1 EP3458713 A1 EP 3458713A1 EP 17724333 A EP17724333 A EP 17724333A EP 3458713 A1 EP3458713 A1 EP 3458713A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- marker
- tower
- sensor
- movement
- vibration
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
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
- 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
- F05B2240/00—Components
- F05B2240/90—Mounting on supporting structures or systems
- F05B2240/91—Mounting on supporting structures or systems on a stationary structure
- F05B2240/912—Mounting on supporting structures or systems on a stationary structure on a tower
-
- 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
- F05B2260/00—Function
- F05B2260/96—Preventing, counteracting or reducing vibration or noise
-
- 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
- F05B2270/30—Control parameters, e.g. input parameters
- F05B2270/334—Vibration measurements
-
- 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
- Y02E10/728—Onshore wind turbines
Definitions
- the present invention relates to a method for determining a vibration of a tower of a wind turbine, a corresponding measuring device and a wind turbine with such a measuring device.
- wind loads act mainly on the rotor blades of a rotor.
- the loads are directed by the rotor via a connection to the machine housing or the nacelle in a tower or mast of the wind turbine.
- nacelle is used synonymously for machine housing.
- the vibration of the nacelle with the tower can be understood mechanically as a vibrating mass point on a firmly clamped beam. Vibrations per se are usually described by the frequency of vibration.
- a natural frequency describes a system property.
- the eigenfrequency of a mechanical vibrator includes a natural mode that reflects the deformation of the body during oscillation associated with the natural frequency.
- natural frequencies occur in pairs, so that, for example, the first and second natural frequencies are substantially identical, at least similar, and the third and fourth natural frequencies are substantially identical or similar.
- the first natural frequency is associated with a first axial natural vibration mode and the second natural frequency is associated with a first lateral natural vibration mode, wherein axially or laterally refers to the rotor axis in the nacelle.
- the third natural frequency is associated with a second axial natural vibration waveform and the fourth natural frequency is associated with a second lateral natural vibration waveform.
- the lateral natural vibration modes are shifted by 90 ° to the corresponding first axial natural vibration modes.
- the natural vibration modes, eigenmodes, vibration modes or vibration modes are also referred to as eigenmodes and these terms are used interchangeably in this application.
- Such a differential equation has a mass element consisting of mass and acceleration vector, an attenuation element consisting of attenuation matrix and velocity vector and a stiffness element consisting of stiffness matrix and motion vector, which, summed up, correspond to the exciter force.
- the exciter force can be determined, whereby then the load on the tower can be determined.
- At least one acceleration sensor for determining an acceleration and / or a position sensor for determining a deflection in the region of the nacelle are usually arranged. This can also determine a speed of the nacelle movement. From this an equation of motion of the tower in the area of the nacelle can be derived. From this, a tower's natural frequency of the tower can be determined. From the equation of motion in the area of the nacelle, in turn, it is possible to determine loads that act on the tower due to the vibration.
- the first and thus also the second natural frequency and at least the first natural oscillating shape of the tower oscillation in the axial direction can be determined with sufficient accuracy, which is shown as state of the art in FIG.
- the largest deflection occurs in the head area of the tower on the nacelle.
- higher natural vibration modes can exert a load on the tower.
- Higher natural vibration modes such as, for example, a second axial natural mode and a second lateral mode, usually have a maximum deflection not on the nacelle, but rather in the upper third to fifth or lower third of the tower, which can also stress the system and negative influences can have the life of the plant.
- a detection of such second axial and second lateral tower eigenschwingformen to which the third and fourth natural frequency belongs is hardly possible in operation with the known sensors in the nacelle.
- the German Patent and Trademark Office has in the priority application for the present application the following state of the art research: DE 101 13 038 A1, DE 196 41 035 A1, DE 10 201 1 01 1 392 A1 and US 2007/0182162 A1.
- the present invention is therefore based on the object to address at least one of the above-mentioned problems.
- a solution is to be proposed which facilitates monitoring of tower vibrations.
- At least an alternative solution to previous proposals should be proposed.
- the method according to the invention for determining an oscillation of a tower of a wind energy installation comprises the steps of recording a movement of at least one marker arranged on the tower by means of a measuring transducer. Determining at least one amount of vibration describing the vibration from the sensed motion, wherein the sensing of the motion is such as to detect movement of the marker relative to the sensor.
- at least one marker is arranged on the tower of the wind energy plant, which can be referred to here synonymously as a marking element.
- the one or more markers in particular one or more arranged on the tower plate or plates, moves with the tower with when the tower is caused by acting on the wind turbine loads vibrate. The movement of the marker is recorded by means of the sensor.
- the sensor remains at rest or moves itself only insignificantly, so that any movement of the sensor is negligible.
- the marker thus moves relative to the sensor. From the relative movement of the marker relative to the sensor, a vibration quantity is determined.
- the oscillation variable may be, for example, the frequency of the oscillation and / or in particular the amplitude or the deflection of the marker from its rest position.
- the vibration acceleration and / or the vibration velocity and the damping of the tower can be determined.
- the attenuation can be positive or negative.
- a positive damping the vibration amplitudes decrease after the excitation and the system is stable.
- a negative damping causes an unstable system in which the vibration amplitudes increase after the excitation.
- the above sizes are for the solution of the movement of the tower descriptive differential equation necessary.
- the determination of the vibration quantity takes place, for example, via a fast Fourier transformation or an order analysis.
- a horizontal movement of the marker is recorded.
- a horizontal movement of the marker is directed substantially transverse to a vertical axis of the tower of the wind turbine. Consequently, transversal vibrations of the tower are recorded. Therefore, the recording of the movement of the marker is free from effects that act in the direction of the vertical axis of the tower.
- Such transverse movements in the tower create a bending or compressive load in the tower. Therefore, a load on the tower can be derived from the horizontal or transverse movements of the marker.
- the at least one marker or a marker thereof is arranged in a region on the tower, in which a maximum deflection of a second natural oscillation shape of the oscillation to be determined is to be expected and / or the marker in a lower third of the tower or is placed in an upper third of the tower and / or in an upper fifth of the tower.
- the deflection is particularly large in the upper fifth, if the investigated tower is a hybrid tower, which is formed in the lower part as a concrete tower and in the upper part as a steel tower.
- the marker should not be located in the tower head, especially not in the nacelle, but at least 10% below the tower head.
- the second natural oscillation of the vibration of a tower of a wind turbine is characterized by the formation of a vibration in the region of the lower third or an upper third or an upper fifth of the tower.
- These areas of the tower have a large deflection in the second natural oscillation shape, be it axial or lateral, so that the movement can be well grasped here.
- the knowledge of the deflection is important for the determination of the loads acting on the tower and thus for the lifetime estimation.
- the position can be determined from empirical values or from simulations based on a model of finite elements. An analytical calculation is also possible.
- a position can be selected at which a large deflection of the third natural vibration mode is to be expected.
- the third natural mode and fifth and sixth natural frequency can be well determined.
- a position for arranging a mark on which the second and third natural modes have a large deflection there is a transition range between a maximum of both natural modes. Such a transition region may be particularly between a tower center and an upper or lower third of the tower.
- the senor is arranged in a head or foot region of the tower. It has been shown that the movement of the marker can be detected particularly well from these areas.
- the senor detects a direction in which the marker is located in relation to the sensor and the movement of the marker is determined from a change in the detected direction. This can be achieved in particular by the fact that the sensor is tracked to the marker.
- Another embodiment of the method according to the invention provides that light is emitted by the sensor, which is reflected by the at least one marker to the sensor and received by the sensor.
- This allows contactless recording of the movement of the marker.
- Contactless recording of the movement of the marker by means of light has a high sensitivity of the measurement, since minute changes in the position of the marker can cause a change in the reflection of the light from the marker.
- This makes it possible to record reliable measurements even with very small movements. Since such a measuring arrangement manages without mechanically movable elements, use of such a measuring arrangement has a long service life.
- sensors are used which emit a laser beam. This allows a particularly high measurement accuracy can be achieved.
- the method is characterized in that the marker has a reference pattern and the reference pattern is optically recognized by the sensor, so that movement of the marker is detected by the sensor as movement of the reference pattern, the reference pattern preferably being on or off two-dimensional bar code is formed. The method thus detects this movement of the reference pattern.
- the movement can also be detected quantitatively.
- the movement can be quantitatively detected by counting at a focussing point of passing strokes. Between two lines, the position can be detected by changing the brightness. If a two-dimensional barcode is used and it is coded differently in the two directions, that is, if it has, for example, different thicknesses of lines, the measuring sensor can detect the exact direction of movement of the marker over it.
- the movement of the marker is detected by the sensor via a change in a physical connection between the sensor and the marker.
- Such a physical connection could be, for example, a traction means stretched between the sensor and the marker, such as a rope, such as in a cable traction sensor.
- a movement of the marker will lead to a change in a distance between the sensor and marker. Accordingly, the traction means is pulled, which is detected by the sensor.
- a use of such a measuring arrangement could detect a movement of the marker even if a power supply of the light source of the sensor fails.
- the oscillation of a second natural oscillation shape and optionally also further natural oscillation modes including a first natural oscillation shape of the oscillation of the tower is determined.
- superposed natural vibration modes can be determined.
- the respective axial and lateral natural vibration modes can also overlap.
- the gondola and the tower swing forward and backward, but at the same time also the tower in itself, to give an illustrative example.
- the determination and monitoring of only the first natural oscillating shape could lead to the system stressing movements of further natural modes undetected and thus, for example, an overall higher load on the wind turbine, especially the tower, would remain unrecognized.
- An advantageous development of the method provides that detects a torsional vibration of the tower from the movement of the marker relative to the sensor becomes.
- a torsion of the tower occurs additional shear stresses arise in the tower, which lead to an additional burden.
- critical loads arising, for example, from a superposition of shear stresses and transverse stresses can be reliably detected.
- the movement of the marker can be detected and from this the torsional motion and therefrom the torsional vibration can be determined.
- a structural load of the wind energy plant is detected from the movement of the marker.
- at least one natural mode can be determined from the movement of the marker.
- an external exciter force can be determined with which the wind energy plant or the tower is excited, from which the load of the wind energy plant can be derived, in particular calculated. This also loads the rotor blades or imbalances of the rotor can be determined.
- u is the detected displacement at the marker.
- the relevant mass is taken into account as a point-like mass m in the region of the marker.
- An attenuation is taken into account via the damping constant d and a stiffness over the stiffness constant k.
- m - ü (t) can be used as a mass element, the term d - ü (t) as
- Damping member and the term k - u (t) are interpreted as a stiffness member. F err indicates the excitement in it.
- An embodiment of the method according to the invention provides that when a limit value of the load or a vibration variable is exceeded, the wind energy plant is set up to be put into a safe operating state, in particular that the wind energy plant is switched off or a load or the respective vibration variable reducing Control strategy is activated. If, therefore, a limit value violation is detected, the method is designed to convert the wind energy plant into a safe operating state and, if necessary, to switch off the wind energy plant.
- a load reducing control strategy suggests operating a pitch angle controller for the rotor blades to influence and to change the angle of attack of the rotor blades to the wind to reduce vibration excitation. In this way the burden could be reduced. Alternatively or additionally, the azimuth angle of the nacelle can be changed. Thus, safety measures can be taken when safety-relevant vibrations occur.
- a measuring device for determining a vibration of a tower of a wind power plant with a sensor arranged on the tower and at least one marker arranged on the tower is proposed, wherein the measuring device is configured to carry out a method according to at least one embodiment described above.
- a metrological means is provided which enables a simple consideration of the dynamic behavior of the tower or other wind turbine structure. This will also create a monitoring system for load estimation and regulatory control.
- the sensor and the at least one marker are arranged on a tower wall.
- the marker can be designed as a plate extending from the tower wall.
- the sensor is, for example, arranged above or below the plate on the tower wall, wherein the sensor is aligned with the plate. On the tower wall therefore a visual connection or a physical connection between the marker and the sensor is provided.
- An embodiment of the measuring device provides that the sensor and the at least one marker are arranged in an interior of the tower or in the center of the tower on an intermediate plate.
- An arrangement of the components of the measuring device in the tower protects them from the effects of the weather.
- the arrangement of the marker in the center of the tower on an intermediate plate it is easy to reach, both in the case of maintenance, as well as for the sensor.
- the marker has a reference pattern.
- the marker has a marker pattern such as a bar code.
- An optical tracking of the marking pattern allows its movement to be detected and evaluated.
- the sensor is not tracked to the marking pattern, but it will be from the sensor Changes in the pattern by its movement with respect to a focusing point on which the sensor optically focused recorded. According to this alternative, the sensor can thus be set up to detect a movement of the marker via a change in the position of the marker and thus of the marking pattern.
- a wind energy plant is proposed with a tower and a nacelle arranged on the tower, the nacelle having an aerodynamic rotor, further comprising a marker arranged on the tower, a sensor for detecting a movement of the at least one marker, a determining means for determining at least one the vibration descriptive vibration quantity from the recorded motion, wherein the sensor and the at least one marker are prepared to perform the recording of the movement so that a movement of the marker is recorded relative to the sensor.
- the wind turbine is thus particularly prepared to perform a method according to an embodiment.
- the sensor and the marker are thereby prepared to perform the recording of the movement so that a movement of the marker is recorded relative to the sensor, that they are arranged spaced from each other. In particular, they have an optical connection to each other, or a tension member that receives the relative movement.
- the wind turbine is prepared to carry out a method according to one of the embodiments described above.
- the explanations made above are applicable to the wind turbine.
- the wind turbine has a measuring device according to at least one embodiment described above.
- sensors and markers are those of the measuring device, if a measuring device is used.
- the wind turbine is characterized in that the sensor is arranged in a head or foot area of the tower. It has been shown that natural vibration modes of the second and higher natural frequencies can be recorded there particularly well.
- the invention thus proposes a solution that can detect deformations, natural frequencies and natural vibration modes of structures of a wind turbine for monitoring the vibrations of the structure.
- a contactless measuring method is preferably provided.
- structural load estimates can be extended as part of a load monitoring system.
- the determined measurement data can be used as inputs for load-reducing control strategies, such as, for example, active tower vibration damping.
- Fig. 1 shows schematically a wind turbine according to the invention.
- Fig. 2 shows schematically a swinging motion of the wind turbine in its first natural mode.
- Fig. 3 shows schematically a swinging motion of the wind turbine in its second natural mode.
- FIGS. 4a to 4c show different reference patterns of a marker of a measuring device according to the invention.
- FIG. 1 shows a wind energy plant 100 with a tower 102 and a nacelle 104.
- a rotor 106 with three rotor blades 108 and a spinner 110 is arranged on the nacelle 104.
- the rotor 106 is set in rotation by the wind in rotation and thereby drives a generator in the nacelle 104 at.
- a first natural mode of the wind turbine is shown in Fig. 2.
- the first natural oscillation shape is characterized by a kind of oscillating movement of the nacelle 104 around a rest position.
- the nacelle 104 of the wind turbine 100 oscillates substantially from left to right in the direction of the rotor axis.
- the left side of FIG. 2 shows the wind energy plant 100 in a first maximum deflection
- the right side shows the wind energy plant 100 in a second maximum deflection.
- the gondola oscillates back and forth, wherein the tower 102 experiences a bending load.
- This oscillatory movement can be detected by means of an acceleration measuring sensor 1 12 arranged in the nacelle 104.
- FIG. 1 A second natural mode of the wind turbine 100 is shown in FIG. In the second natural oscillating shape of the tower 102, the tower 102 essentially swings in the region of the upper fifth and in the region of the lower third, so that the tower 102 deforms wave-shaped or S-shaped and thus in the upper region, in particular in the upper fifth biggest deflections are to be expected. Such a natural mode is difficult to detect with an acceleration sensor 1 12.
- the wind energy plant 100 is shown only schematically in FIGS. 2 and 3, and for the sake of simplicity, the same reference numerals have been used for similar elements.
- the wind turbine 100 therefore has a measuring device 120.
- the measuring device 120 comprises a measuring sensor 122 and at least one marker 124 arranged on the tower 102.
- wind loads occur at the wind energy plant 100, causing the wind energy plant 100 or the pod 104 and / or the tower 102 to oscillate.
- the sensor 122 and the marker 124 move relative to each other.
- the sensor 122 receives the movement of the marker 124. From the recorded motion a vibration magnitude is determined, which describes the vibration.
- a variable describing the vibration may be a frequency and / or a displacement. From these quantities, a vibration velocity and / or a vibration acceleration and / or a damping of the system is determined.
- the marker 124 is arranged on a tower wall of the tower 102. As described, in the second natural vibration mode, the deflection in an upper portion of the tower 102 is greatest. In this area of the tower 102, where the largest deflection is expected in the second natural vibration mode, the marker 124 is arranged.
- the sensor 122 is arranged in a foot region of the tower 102 in the embodiment shown in FIG.
- the sensor 122 detects a direction in which the marker 124 is located with respect to the sensor 122, indicated by the connection line 126 between sensor 122 and marker 124. Accordingly, it is also possible to arrange the sensor 122, for example, in a head region of the tower 102. The sensor 122 would then be placed above the marker 124. It is provided, as indicated in Fig. 3, that the marker 124 is formed as a plate.
- the plate and the sensor 122 are, for example, arranged inside the tower 102.
- the plate and the sensor are each arranged on the tower wall or at least connected to the tower wall. Alternatively, the plate and the sensor 122 can also be arranged on an intermediate plate in each case in the center of the tower.
- the movement of the marker 124 is then determined from a change in the detected direction.
- the marker 124 is deflected to the right.
- the right half of Fig. 3 shows the wind turbine 10 with a deflected to the left marker 124.
- the area of the tower 102, in which the sensor 122 is arranged does not oscillate substantially in the second natural mode and remains largely undeflected. This results in a change in the direction of the marker 124 with respect to the sensor 122. From this change in the direction in which the marker 124 is located with respect to the sensor 122, the movement of the marker 124 is determined.
- Typical vibration paths or deflections for the second natural frequency are a few centimeters up to 0.5 meters. The measuring device 120 must therefore be designed to detect such vibration paths.
- the movement of the marker 124 is contactlessly received by the sensor 122. It is important in the contactless detection of the movement of the marker that a free line of sight between sensor 122 and marker 124 is present.
- the sensor 122 has a device for emitting light, such as a laser. The light emitted by the sensor 122 is reflected by the marker 124 and received by the sensor 122. If the marker 124 moves out of its rest position, the sensor 122 traces the laser beam to the marker 124. The laser beam thus changes its orientation. The movement of the marker 124 is then determined from the runtime variables.
- the movement of the marker 124 could also be coupled to the sensor 122 by a cable pull. This would require a physical connection between marker 124 and Sensor 122 are produced, which is not shown in Figure 3. A movement of the marker 124 would then cause a change in length of the rope, or other traction means, which could be detected, for example, via an incremental encoder of the sensor 122. It is provided that the marker 124 has a reference pattern 128, 130 (FIG. 4). The sensor 122 observes the reference pattern 128, 130 and determines the movement of the marker from the change of the observed reference pattern 128, 130.
- a vibration quantity is now determined which describes the second natural vibration shape of the vibration of the tower 102. If necessary, further natural vibration modes can be determined from the oscillation variable determined in this way. Furthermore, loads on the wind turbine 100 can be calculated with knowledge of the vibration. From the movement of the marker can be calculated directly structural loads of the wind turbine 100. With the help of the measuring device can be both transverse vibrations, both in the axial and in the lateral direction as well as torsional vibrations of the tower detect. In the case of a torsional vibration, the tower essentially ters around its vertical axis, as a result of which shear stresses in the tower and possibly also normal stresses in the direction of the tower vertical axis arise.
- FIG. 4a shows a reference pattern 128 for the marker 124 for a rectangular or round plate as a marker 124.
- the reference pattern has vertical and horizontal lines which are arranged crosswise one above the other.
- the sensor 122 can determine which direction the marker 124 is moving or in which directions it is oscillating.
- the lines are arranged at regular intervals. The distance between two lines represents an increment of a displacement of the marker 124.
- vibrations can also be detected whose center of oscillation is not exactly in the center of the tower. For example.
- the tower could oscillate forwards / backwards and laterally, ie left / right, so that a resulting direction of the oscillatory movement does not pass through the center of the tower.
- This type of reference pattern 128 is preferably used when the marker 124 is disposed on the tower wall.
- FIG. 4b shows another reference pattern 130 for the marker 124.
- the reference pattern 130 has a plurality of concentric lines that are spaced at regular intervals are arranged to each other. This type of reference pattern 130 is preferably used when the marker 124 is mounted in the center of the tower.
- the reference pattern 132 may also have a color gradient, as indicated in Fig. 4c. About a color meter, the exact deflection of the marker 124 can then be determined.
- the gradient is arbitrary and could, for example, from the center of light to dark.
- the gradient could also include several colors.
- the reference patterns are alternatively arranged on the outside of the tower, for example. With a paint on the tower outer wall. From a window of the nacelle is observed by a sensor, the migratory reference pattern and determined from the movement as described a vibration of the tower.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wind Motors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102016109122.7A DE102016109122A1 (en) | 2016-05-18 | 2016-05-18 | Method for determining a vibration of a wind turbine tower |
PCT/EP2017/060795 WO2017198481A1 (en) | 2016-05-18 | 2017-05-05 | Method for determining vibration of a wind turbine tower |
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Publication Number | Publication Date |
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EP3458713A1 true EP3458713A1 (en) | 2019-03-27 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP17724333.4A Withdrawn EP3458713A1 (en) | 2016-05-18 | 2017-05-05 | Method for determining vibration of a wind turbine tower |
Country Status (3)
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EP (1) | EP3458713A1 (en) |
DE (1) | DE102016109122A1 (en) |
WO (1) | WO2017198481A1 (en) |
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ES2739898A1 (en) * | 2018-08-03 | 2020-02-04 | Siemens Gamesa Renewable Energy Innovation & Technology SL | Wind turbine tower system for modifying the second natural frequency (Machine-translation by Google Translate, not legally binding) |
CN111852790A (en) * | 2020-07-28 | 2020-10-30 | 三一重能有限公司 | Tower drum monitoring method and system of wind driven generator and electronic equipment |
US11199175B1 (en) | 2020-11-09 | 2021-12-14 | General Electric Company | Method and system for determining and tracking the top pivot point of a wind turbine tower |
US11703033B2 (en) | 2021-04-13 | 2023-07-18 | General Electric Company | Method and system for determining yaw heading of a wind turbine |
US11536250B1 (en) | 2021-08-16 | 2022-12-27 | General Electric Company | System and method for controlling a wind turbine |
CN115539325B (en) * | 2022-09-27 | 2024-01-30 | 西安热工研究院有限公司 | Tower vibration early warning method based on wind turbine generator |
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DE10113038C2 (en) * | 2001-03-17 | 2003-04-10 | Aloys Wobben | Tower vibration monitoring |
US20070182162A1 (en) * | 2005-07-27 | 2007-08-09 | Mcclintic Frank | Methods and apparatus for advanced windmill design |
DE102011016868B4 (en) * | 2010-04-13 | 2013-05-16 | Baumer Innotec Ag | Measuring device for measuring deformations of elastically deformable objects |
DE102011011392B4 (en) * | 2011-02-17 | 2012-10-25 | Ssb Wind Systems Gmbh & Co. Kg | Optical measuring device for the deformation of a rotor blade of a wind turbine |
DE102011112627A1 (en) * | 2011-09-06 | 2013-03-07 | Robert Bosch Gmbh | Method for monitoring and operating wind energy plant within wind farm, involves determining mechanical load of energy plant by evaluating device, and providing control variables of energy plant to control device based on measured variables |
GB201222540D0 (en) * | 2012-12-14 | 2013-01-30 | Lm Wp Patent Holding As | A system and method for wind turbine sensor calibration |
-
2016
- 2016-05-18 DE DE102016109122.7A patent/DE102016109122A1/en not_active Withdrawn
-
2017
- 2017-05-05 WO PCT/EP2017/060795 patent/WO2017198481A1/en unknown
- 2017-05-05 EP EP17724333.4A patent/EP3458713A1/en not_active Withdrawn
Also Published As
Publication number | Publication date |
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WO2017198481A1 (en) | 2017-11-23 |
DE102016109122A1 (en) | 2017-11-23 |
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