CN114252497A - Wind generating set and detection device and detection method for variable pitch bearing - Google Patents
Wind generating set and detection device and detection method for variable pitch bearing Download PDFInfo
- Publication number
- CN114252497A CN114252497A CN202011020881.5A CN202011020881A CN114252497A CN 114252497 A CN114252497 A CN 114252497A CN 202011020881 A CN202011020881 A CN 202011020881A CN 114252497 A CN114252497 A CN 114252497A
- Authority
- CN
- China
- Prior art keywords
- pitch bearing
- bolts
- return
- signal
- current component
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 75
- 230000005284 excitation Effects 0.000 claims abstract description 74
- 230000004044 response Effects 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 238000010998 test method Methods 0.000 claims 1
- 238000005336 cracking Methods 0.000 abstract description 5
- 238000012544 monitoring process Methods 0.000 description 31
- 238000004891 communication Methods 0.000 description 13
- 230000002238 attenuated effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000005314 correlation function Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000006378 damage Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 238000010606 normalization Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/60—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrostatic variables, e.g. electrographic flaw testing
- G01N27/61—Investigating the presence of flaws
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The utility model provides a wind generating set and become detection device and detection method of oar bearing, the detection device who becomes the oar bearing includes: a signal generator configured to be electrically connected to two excitation bolts of a plurality of bolts for fixing a pitch bearing and to generate an electrical excitation signal; a signal acquisition unit configured to receive return signals received by return bolts other than the two excitation bolts among the plurality of bolts and obtain a direct current component based on the electric excitation signals and the return signals; a processor configured to determine whether a crack exists in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component. The detection device provided by the embodiment of the invention can be used for detecting the cracking condition of the variable-pitch bearing.
Description
Technical Field
The invention relates to the field of wind power generation, in particular to a wind generating set and a detection device and a detection method of a variable-pitch bearing.
Background
With the increasing severity of energy crisis, wind energy is gaining attention from countries in the world as clean energy. The wind generating set is expensive in manufacturing cost, severe in using environment and complex in working condition, and the variable pitch bearing is likely to crack under the comprehensive action of various loads such as vibration, torsion, shearing, extrusion, bending load and the like for a long time in the operation process.
If the fault of the variable-pitch bearing is not found timely, equipment of the wind generating set can be caused to have an accident, huge economic loss is caused, and personal injury accidents can happen seriously.
The blades of the wind generating set convert wind energy into kinetic energy, and a variable-pitch bearing connecting the blades and a hub can crack and break down, and the crack can be divided into early cracks, medium cracks and late cracks according to the development of the cracks.
After the variable-pitch bearing generates cracks, the stress is applied due to the constraint of the bolts, the cracks continue to expand to the reinforcing ring, the reinforcing ring cracks, grease leaks, the cracks continue to expand, and finally the blade may fall.
The existing strain gauge, conductive paint, tin foil paper and ultrasonic crack early warning have the problems of poor operability, poor running stability, contact damage, high labor cost and the like, and are inconvenient in the field test process.
Disclosure of Invention
One of the purposes of the invention is to provide a detection device capable of detecting the cracking condition of a variable-pitch bearing.
One of the objectives of the present invention is to provide a detection device which is easy to install and position.
According to an aspect of the invention, there is provided a detection apparatus for a pitch bearing, the detection apparatus comprising: a signal generator configured to be electrically connected to two excitation bolts of a plurality of bolts for fixing a pitch bearing and to generate an electrical excitation signal; a signal acquisition unit configured to receive return signals received by return bolts other than the two excitation bolts among the plurality of bolts, and obtain a direct current component based on the electric excitation signals and the return signals; a processor configured to determine whether a crack exists in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component.
Optionally, the signal acquisition unit may be further configured to: a correlation operation is performed on the electrical excitation signal and the return signal to obtain a direct current component.
Optionally, the signal acquisition unit may include: an amplifying circuit that amplifies the return signal to obtain an amplified signal; and the analog signal multiplier is used for performing correlation operation on the amplified signal and the electric excitation signal to obtain a direct current component.
Optionally, the detection device may further include: a filter circuit for filtering the DC component to obtain a DC signal; an analog-to-digital converter that converts the direct current signal to a digital signal, the processor being further configured to determine whether a crack exists in the plurality of bolts or the pitch bearing based on the digital signal.
Alternatively, the filter circuit may comprise two low-pass filters connected in series with each other.
Optionally, a plurality of bolts may be fixed to an edge of the pitch bearing in a circumferential direction of the pitch bearing, the processor being configured to determine the location of the crack based on the magnitude of the direct current component obtained for each of the return bolts.
Optionally, the processor may be further configured to: in response to the attenuation of the amplitude of the direct current component exceeding a predetermined value, it is determined that a crack is present in the return bolt or the pitch bearing near the return bolt at the respective location.
Alternatively, the two excitation bolts may be arranged in the diameter direction of the pitch bearing.
Optionally, the processor may be further configured to: determining that the first return bolt has a crack or that a portion of the pitch bearing close to the first return bolt has a crack in response to an attenuation of a direct current component obtained by a first return bolt of the two adjacent return bolts far from the ground point exceeding a first predetermined value and an attenuation of a direct current component obtained by a second return bolt of the two return bolts close to the ground point being lower than a second predetermined value, wherein the first predetermined value is larger than the second predetermined value.
Alternatively, the electrical excitation signal may comprise at least one of a sinusoidal signal, a square wave signal, and a triangular wave signal.
According to another aspect of the invention, a wind power plant comprises a detection device according to the above described pitch bearing.
According to another aspect of the invention, a method of detecting a pitch bearing may comprise: providing an electrical excitation signal to two excitation bolts of a plurality of bolts for fixing a pitch bearing; receiving return signals received by other return bolts except for the two excitation bolts in the plurality of bolts, and obtaining direct-current components based on the electric excitation signals and the return signals; determining whether cracks exist in the plurality of bolts or the pitch bearing based on the amplitude of the direct current component.
Optionally, the step of obtaining a direct current component based on the electrical excitation signal and the return signal may comprise: a correlation operation is performed on the electrical excitation signal and the return signal to obtain a direct current component.
Optionally, the step of determining whether there is a crack in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component may comprise: and determining that the bolt at the corresponding position or the pitch bearing near the bolt has a crack in response to the attenuation of the amplitude of the direct current component exceeding a predetermined value.
Alternatively, a plurality of bolts may be fixed to the edge of the pitch bearing in the circumferential direction of the pitch bearing, and two excitation bolts may be arranged in the diameter direction of the pitch bearing.
Optionally, the step of determining whether there is a crack in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component may comprise: determining that the first return bolt has a crack or that a portion of the pitch bearing close to the first return bolt has a crack in response to an attenuation of a direct current component obtained by a first return bolt of the two adjacent return bolts far from the ground point exceeding a first predetermined value and an attenuation of a direct current component obtained by a second return bolt of the two return bolts close to the ground point being lower than a second predetermined value, wherein the first predetermined value is larger than the second predetermined value.
The detection device and the detection method provided by the embodiment of the invention have strong compatibility, can detect and early warn the cracking condition of the variable-pitch bearings of different types, and only needs to reduce or increase the number of detection channels.
The detection device and the detection method according to the embodiment of the invention use wireless communication to adapt to the requirement that the existing model can not increase communication channels.
In addition, according to the detection device and the detection method provided by the embodiment of the invention, a large amount of work of maintenance personnel is avoided, and the maintenance efficiency is improved.
Drawings
The above and/or other objects and advantages of the present invention will become more apparent from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:
fig. 1 is a block diagram showing a detection circuit according to a first embodiment of the present disclosure;
FIG. 2 is a schematic diagram showing the detection points of a pitch bearing according to an embodiment of the present disclosure;
FIG. 3 is a block diagram illustrating a detection circuit according to a second embodiment of the present disclosure;
fig. 4 is a flowchart illustrating a detection method according to a first embodiment of the present disclosure; and
fig. 5 is a flowchart illustrating a detection method according to a second embodiment of the present disclosure.
Detailed Description
The embodiment of the disclosure utilizes the bolt of the pitch bearing as a receiving component of the electric excitation signal, and determines whether the pitch bearing or the bolt of the pitch bearing has cracks or not through the return signal of the electric excitation signal. The early warning effect on the cracks of the variable-pitch bearing or the bolt of the wind generating set is good.
The test process and the application result show that compared with the commonly adopted strain gauge, conductive paint, tin foil paper and ultrasonic crack detection technology, the detection technology has the advantages of small human interference factor, high engineering operability, low labor cost and strong compatibility. For variable-pitch bearings of different types, the number of detection channels is only required to be reduced or increased. In addition, the contact damage to the variable-pitch bearing of the wind generating set is small.
The detection device and the detection method of the pitch bearing of the invention are described in detail below with reference to the accompanying drawings. Like reference numerals refer to like elements throughout the detailed description.
Fig. 1 is a block diagram showing a detection circuit according to a first embodiment of the disclosure, fig. 2 is a schematic diagram showing a detection point of a pitch bearing according to an embodiment of the disclosure, and fig. 3 is a block diagram showing a detection circuit according to a second embodiment of the disclosure.
The detection device of the variable pitch bearing can be used for monitoring, early warning, alarming and the like of cracks of the variable pitch bearing and/or bolts on the variable pitch bearing of the wind generating set.
The detection apparatus according to an embodiment of the present disclosure may include a signal generator 11, a signal acquisition unit 30, and a processor 40.
The signal generator 11 may be electrically connected to a plurality of bolts 20 on the pitch bearing 22, for example, the signal generator 11 may be electrically connected to two excitation bolts of the plurality of bolts and may generate an electrical excitation signal.
Here, the electrical excitation signal may include a sinusoidal signal, a square wave signal, and a triangular wave signal, but embodiments of the present disclosure are not limited thereto.
According to the embodiment of the disclosure, the electric excitation signal is directly applied to the bolt to detect the crack, the man-made interference factor is small, the engineering operability is high, the labor cost is low, the compatibility is strong, and the contact damage to the variable pitch bearing of the wind generating set is small.
The signal generator 11 may provide the electrical excitation signal Vin autonomously, or may output a desired electrical excitation signal Vin under the control of the processor 40. Specifically, signal generator 11 may output a 5V 1MHz sine wave under the control of processor 40.
The signal pickup unit 30 may receive return signals received by the other bolts (return bolts) than the two excitation bolts among the plurality of bolts, and obtain a direct-current component based on the electric excitation signals and the return signals.
The return bolt herein refers to a bolt through which a return signal is received, and the return signal refers to a detection signal or a feedback signal received from the return bolt after an electric excitation signal is applied to the excitation bolt.
As shown in fig. 2, a positive signal and a negative signal are respectively supplied to a first excitation bolt 23 and a second excitation bolt 24, where "GND" is a reference zero potential of all detection signals, monitoring points (r) to (r) respectively correspond to bolts on the pitch bearing, and a signal acquisition line of a signal acquisition unit 30 is connected to the corresponding bolts.
As shown in FIG. 2, one end of the ten-way signal collection line is connected to the corresponding bolt, the other end of the ten-way signal collection line is connected to connector J1, and the positive and negative signals of the excitation signal are also electrically connected to connector J1.
Although the number of return bolts is shown in the drawings as 10, this is merely an example, and the number of bolts is not particularly limited, for example, the number of bolts may be in the range of 4 to 100 (e.g., 4, 8, or 20). Each return bolt may be encoded by the processor, and the processor 40 may determine whether a crack is present in the respective bolt or a pitch bearing in the vicinity thereof based on the return signal of the respective bolt, and may determine the position of the crack relative to the respective bolt.
For example, when it is determined that the amplitude of the return signal received from monitoring point (c) is below a predetermined value, it may be determined that there is a crack in the pitch bearing and/or bolts of monitoring point (c) near monitoring point (c).
The return bolt receives a return signal of lesser amplitude the further it is from the input point of the positive signal (the further it is from the excitation bolt 23), but of a significantly lesser degree than the attenuation due to the presence of cracks in the pitch bearing or bolt. The predetermined value here may be a predetermined percentage (e.g. 80%) of the amplitude of the electrical excitation signal. Further, the existence of the crack can be determined based on the phase change of the return signal, so that the crack monitoring accuracy is improved. For example, when it is determined that the amplitude of the return signal received from monitoring point (c) is below a predetermined value and the phase of the return signal is delayed by a predetermined phase compared to the electrical excitation signal, it may be determined that there is a crack in the pitch bearing and/or the bolt of monitoring point (c) near the monitoring point (c).
In addition, the return signals received by different monitoring points can be normalized, for example, in the case of no crack, the processor can normalize the return signals received by different monitoring points, so that the amplitudes of the return signals received by different monitoring points are the same. For example, the amplitude of the return signal received by the monitoring point (r) is M1, when the amplitude of the return signal actually received by the monitoring point (r) is 95% M1, the amplitude of the return signal actually received by the monitoring point (c) is 90% M1, the amplitude of the return signal actually received by the monitoring point (r) is 85% M1, and the amplitude of the return signal actually received by the monitoring point (c) is 80% M1, the processor can normalize the amplitudes to M1, and determine that no crack exists in the pitch bearing and the bolt. That is, the processor may convert the amplitudes of the return signals received by each monitoring point in different manners so as to be identical to each other in the case where no crack exists, and may judge that a crack exists at the monitoring point of the corresponding position if the amplitude after the conversion is smaller than the threshold value. Thereby, the influence of normal attenuation due to a normal increase in impedance on the signal transmission path can be reduced.
The processor 40 may determine that the first return bolt of the pitch bearing is cracked in response to attenuation of a direct current component obtained by a first return bolt of the two adjacent return bolts that is far from the ground point (e.g., the return bolt of the monitoring point (r)) exceeding a first predetermined value and attenuation of a direct current component obtained by a second return bolt of the two return bolts that is near to the ground point (e.g., the return bolt of the monitoring point (r)) being lower than a second predetermined value. Where the first predetermined value is greater than the second predetermined value. The attenuation of the dc component obtained by the second return bolt here may be zero if subjected to a normalization process. The attenuation of the dc component obtained by the second return bolt here may be a normal attenuation value, e.g. 5%, if not normalized.
In addition, the processor 40 may also determine that there is a crack in a portion of the pitch bearing between the first return bolt and the second return bolt in response to the attenuation of the direct-current component obtained by a first return bolt (e.g., the return bolt of the monitoring point (r)) that is far from the ground point, of the adjacent two return bolts, being in a normal range and the attenuation of the direct-current component obtained by a second return bolt (e.g., the return bolt of the monitoring point (r)) that is near the ground point, of the two return bolts being greater than a third predetermined value and less than a fourth predetermined value. The third predetermined value may be a normal attenuation value, and the fourth predetermined value may be greater than the normal attenuation value. In other words, if the return signal of the first return bolt is normally attenuated and the return signal of the second return bolt is abnormally attenuated but the degree of attenuation is not so large, it can be determined that the second return bolt itself has no crack but a portion between the first return bolt and the second return bolt has a crack. Due to the presence of this crack, the impedance of the path through which the signal travels increases, resulting in an increase in the attenuation amplitude of the second return bolt.
According to the embodiment of the invention, the bolts of the variable pitch bearing and the health condition of the variable pitch bearing can be dynamically monitored on line, and early warning can be carried out.
As shown in fig. 2, a plurality of bolts are fixed to the edge of the pitch bearing 22 along the circumferential direction of the pitch bearing 22, for example, they may be arranged at equal angles on the edge of the pitch bearing 22, where equal angles refer to the same angle formed by the connecting lines of two adjacent bolts and the axial center of the pitch bearing.
The first excitation bolt 23 and the second excitation bolt 24 may be arranged along the diameter direction of the pitch bearing, and the other bolts (return bolts) may be symmetrically arranged on both sides of the diameter direction, for example, the return bolts at monitoring points (r) to (c) may be arranged on the left side of the diameter direction, and the return bolts at monitoring points (c) to (r) may be arranged on the right side of the diameter direction.
The first excitation bolt 23 and the second excitation bolt 24 are arranged in the diameter direction of the pitch bearing, so that the collection of return signals is facilitated, and the position of a crack is judged.
Alternatively, the processor 40 may receive the analog-to-digital converted digital signal without conversion by an ADC therein, and the processor 40 may directly receive the direct current component and convert it into the digital signal, and then determine whether cracks exist in the plurality of bolts or the pitch bearing based on the digital signal.
As shown in fig. 3, the signal acquisition unit 30 may receive return signals from the respective monitoring points collected by the connector 21, that is, the signal acquisition unit 30 may receive return signals received by return bolts other than two excitation bolts among the plurality of bolts, and obtain a direct-current component based on the electric excitation signal and the return signals.
The signal acquisition unit 30 may perform a correlation operation on the electrical excitation signal and the return signal to obtain a direct current component. Since the noise is uncorrelated with the electrical excitation signal, the noise can be removed by a correlation operation.
For example, let s (t) be Vscos(ωmt + theta) is weak small signal to be detected, n (t) is noise signal, and r (t) is Vrcos(ωmt), the input signal x (t) mixed with noise is s (t) and n (t). The cross-correlation function of the input signal with the reference signal is:
in the formula, Rsr(t): cross correlation function of the signal to be measured and the reference signal; rnr(t): cross correlation functions of noise and electrical excitation signals. R since the noise is uncorrelated with the reference signalnr(t) is 0, thus obtaining Rxr(t)＝Rsr(t), the cross-correlation function of the input signal and the electrical excitation signal (i.e., the reference signal) is only the cross-correlation function of the signal to be measured and the electrical excitation signal, thereby filtering noise.
Alternatively, the signal acquisition unit 30 may not perform the correlation operation on the return signal, and determine whether there is a crack at the corresponding monitoring point directly based on the amplitude of the return signal. The correlation operation may be performed by hardware, for example, the signal acquisition unit 30 may include an amplifying circuit 31 and an analog multiplier 32, the amplifying circuit 31 may amplify the return signal to obtain an amplified signal, and the analog multiplier 32 may perform the correlation operation on the amplified signal and the electrical excitation signal to obtain a direct current component. The dc component here may still include a small amount of high frequency noise.
The processor may determine whether a crack is present at the corresponding monitoring point based on the magnitude of the direct current component. Optionally, the direct current component of the signal acquisition unit 30 may be further filtered via a filter.
The detection apparatus according to the embodiment of the present disclosure may further include a filter circuit 50 and an analog-to-digital converter 60, the filter circuit 50 may filter the direct current component to obtain a direct current signal, and the analog-to-digital converter 60 may convert the direct current signal into a digital signal. The digital signal may be further processed, such as by processor 40. That is, the filter circuit 50 may further filter out high frequency noise.
The filter circuit 50 may be composed of a dedicated low-pass filter chip and a peripheral auxiliary resistor-capacitor device, and is used for filtering high-frequency noise and preventing signal aliasing. For example, a butterworth second order low pass filter may be used, the amplitude frequency response of which is almost completely flat from zero to a cutoff frequency attenuated by 3dB, but with peaks near the cutoff frequency, with overshoot and ringing phenomena for the step response, the transition band decreasing at a moderate speed, with a rate of-6 ndB/decade, where n is the order of the filter.
According to embodiments of the present disclosure, a filter circuit may include an integrated filter chip that is an ultra-low noise, high frequency filter module for channel anti-aliasing or reconstruction applications. The integrated filter chip may include a matched second order filter, and cascading two internal second order filters (e.g., two low pass filters connected in series with each other) may simply achieve a fourth or higher order response. Furthermore, embodiments of the present disclosure are not so limited, and various low-pass or band-pass responses, such as butterworth, chebyshev, bessel, or elliptical responses, may be implemented very simply.
As shown in fig. 3, the detection apparatus according to the embodiment of the disclosure may further include a wireless communication interface 91 of the communication interface circuit 90, the communication interface circuit 90 may include an RS485 interface chip, an optical coupler, and the like, the warning signal may be output to the communication interface circuit 90 via a serial port of the processor, the wireless communication interface 91 converts the signal transmitted by the communication interface circuit 90 into a wireless signal, and the wireless signal may be received by another wireless communication interface 100 and further transmitted to the cabin control system 110 through another wireless communication interface 100. When the pitch bearing is abnormal (e.g. there is a crack in the pitch bearing or bolt), the nacelle control system 110 receives the warning signal and controls the wind turbine generator set to shut down and upload the data to the control room.
The detection device according to the embodiment of the present disclosure may further include a power supply unit 80 and a storage unit 70, the power supply unit 80 may be configured to supply power to the processor and all the subcomponents of the system, and the power supply unit 80 may be composed of a plurality of (e.g., four) lithium super-capacity cells connected in series. The storage unit 70 may be used to store the configuration of the system, initialization values, user settings, and the like. The detection device provided by the embodiment of the invention can be provided with a power supply system, so that the long-time standby requirement can be met.
In addition, the detection device according to the embodiment of the present disclosure may be included in a wind turbine generator set, thereby improving the safe operation of the wind turbine generator set.
Fig. 4 is a flowchart illustrating a detection method according to a first embodiment of the present disclosure, and fig. 5 is a flowchart illustrating a detection method according to a second embodiment of the present disclosure.
As shown in fig. 4, a detection method according to an embodiment of the present invention may include:
s410: the electrical excitation signal is provided to two of the plurality of bolts used for fixing the pitch bearing, where the electrical excitation signal may comprise a sinusoidal signal, a square wave signal, a triangular wave signal, etc. as described above. The electrode may be electrically connected to the bolt and an electrical excitation signal may then be applied to the electrode to provide the electrical excitation signal to the bolt. Of course, the electrical excitation signal may also be provided directly to the bolt.
S420: return signals received by return bolts other than the two excitation bolts in the plurality of bolts are received, and a direct-current component is obtained based on the electric excitation signals and the return signals.
Specifically, as shown in fig. 5, step S420 of the detection method according to the second embodiment of the present invention may include step S421: a correlation operation is performed on the electrical excitation signal and the return signal to obtain a direct current component. Most of the noise can be removed through the correlation operation.
S430: determining whether cracks exist in the plurality of bolts or the pitch bearing based on the amplitude of the direct current component.
Specifically, as shown in fig. 5, step S430 of the detection method according to the second embodiment of the present invention may include step S431: determining that there is a crack in the bolt or the pitch bearing near the bolt at the corresponding position in response to the attenuation of the amplitude of the direct current component exceeding a predetermined value.
For example, it may be determined that the first return bolt has a crack in response to attenuation of a direct current component obtained by a first return bolt, which is far from the ground point, of adjacent two return bolts among the return bolts exceeding a first predetermined value and attenuation of a direct current component obtained by a second return bolt, which is near the ground point, of the two return bolts being lower than a second predetermined value.
The first predetermined value may be greater than the second predetermined value. The attenuation of the dc component obtained by the second return bolt here may be zero if subjected to a normalization process. The attenuation of the dc component obtained by the second return bolt here may be a normal attenuation value, e.g. 5%, if not normalized.
In addition, it is also possible to determine that there is a crack in a portion of the pitch bearing located between the first return bolt and the second return bolt in response to the attenuation of the direct-current component obtained by a first return bolt (for example, the return bolt of monitoring point (r)) that is far from the ground point, of the adjacent two return bolts, being in the normal range and the attenuation of the direct-current component obtained by a second return bolt (for example, the return bolt of monitoring point (r)) that is near the ground point, of the two return bolts, being greater than a third predetermined value and less than a fourth predetermined value. The third predetermined value may be a normal attenuation value, and the fourth predetermined value may be greater than the normal attenuation value.
In other words, if the return signal of the first return bolt is normally attenuated and the return signal of the second return bolt is abnormally attenuated but not significantly attenuated, it can be determined that the second return bolt itself has no crack but a crack exists in a portion between the first return bolt and the second return bolt. Due to the presence of this crack, the impedance of the path that the signal needs to travel after passing the first return bolt increases, resulting in an increased attenuation of the second return bolt.
The wind generating set applying the detection technology can improve the safety of the whole set.
The detection device and the detection method provided by the embodiment of the invention have strong compatibility, can detect the variable-pitch bearings of different types, and only needs to delete or increase the number of detection channels.
The detection device and the detection method of the embodiment of the invention use wireless communication, thereby being suitable for the requirement that the prior model can not increase communication channels.
According to the detection device and the detection method provided by the embodiment of the invention, the problem of data exchange can be solved under the condition that the original unit cannot increase a communication channel.
According to the detection device and the detection method provided by the embodiment of the invention, the detection signal excitation source can be applied to the bolt of the variable-pitch bearing, and the health conditions of the bolt and the variable-pitch bearing can be monitored simultaneously.
In addition, according to the detection device and the detection method provided by the embodiment of the invention, a large amount of work of maintenance personnel can be avoided, and the maintenance efficiency is improved.
The above description is only a preferred embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions (e.g., combinations of features in different embodiments of the present disclosure) that can be easily conceived by a person skilled in the art within the technical scope of the present disclosure should be included in the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (16)
1. A detection device for a pitch bearing, comprising:
a signal generator configured to be electrically connected to two excitation bolts of a plurality of bolts for fixing the pitch bearing and to generate an electrical excitation signal;
a signal acquisition unit configured to receive return signals received by return bolts other than the two excitation bolts among the plurality of bolts, and obtain a direct-current component based on the electric excitation signals and the return signals;
a processor configured to determine whether there is a crack in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component.
2. The pitch bearing detection apparatus of claim 1, wherein the signal acquisition unit is further configured to: performing a correlation operation on the electrical excitation signal and the return signal to obtain the direct current component.
3. The pitch bearing detection apparatus of claim 2, wherein the signal acquisition unit comprises:
an amplification circuit that amplifies the return signal to obtain an amplified signal;
and the analog signal multiplier is used for performing correlation operation on the amplified signal and the electric excitation signal to obtain the direct current component.
4. A detection arrangement for a pitch bearing according to claim 3, wherein the detection arrangement further comprises:
a filter circuit that filters the DC component to obtain a DC signal;
an analog-to-digital converter converting the DC signal into a digital signal,
the processor is further configured to determine whether a crack is present in the plurality of bolts or the pitch bearing based on the digital signals.
5. A detection arrangement of a pitch bearing according to claim 4, wherein the filter circuit comprises two low pass filters connected in series with each other.
6. The apparatus according to claim 1, wherein the plurality of bolts are fixed to an edge of the pitch bearing in a circumferential direction of the pitch bearing,
the processor is configured to determine a location of the crack based on the magnitude of the direct current component obtained for each of the return bolts.
7. A detection arrangement for a pitch bearing according to claim 6, wherein the processor is further configured to: in response to the attenuation of the amplitude of the direct current component exceeding a predetermined value, determining that a crack exists in the return bolt at the corresponding position or in the pitch bearing near the return bolt.
8. A detection arrangement for a pitch bearing according to claim 6, wherein the two excitation bolts are arranged along a diameter of the pitch bearing.
9. A detection arrangement for a pitch bearing according to any of claims 1 to 8, wherein the processor is further configured to: determining that the first return bolt has a crack or that a portion of the pitch bearing close to the first return bolt has a crack in response to an attenuation of a direct current component obtained by a first return bolt of the two adjacent return bolts far from the ground point exceeding a first predetermined value and an attenuation of a direct current component obtained by a second return bolt of the two return bolts close to the ground point being lower than a second predetermined value, wherein the first predetermined value is larger than the second predetermined value.
10. A detection arrangement for a pitch bearing according to any of claims 1 to 8, wherein the electrical excitation signal comprises at least one of a sinusoidal signal, a square wave signal and a triangular wave signal.
11. A wind park comprising a detection device of a pitch bearing according to any of claims 1-10.
12. A detection method for a variable-pitch bearing is characterized by comprising the following steps:
providing an electrical excitation signal to two excitation bolts of a plurality of bolts for fixing the pitch bearing;
receiving return signals received by return bolts other than the two excitation bolts in the plurality of bolts, and obtaining direct-current components based on the electric excitation signals and the return signals;
determining whether there is a crack in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component.
13. A method of testing a pitch bearing according to claim 12, wherein the step of obtaining a dc component based on the electrical excitation signal and the return signal comprises: performing a correlation operation on the electrical excitation signal and the return signal to obtain the direct current component.
14. The method of detecting a pitch bearing of claim 13, wherein the step of determining whether a crack exists in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component comprises: in response to the attenuation of the amplitude of the direct current component exceeding a predetermined value, determining that a crack exists in the bolt at the corresponding position or in a pitch bearing near the bolt.
15. The method for detecting the pitch bearing of claim 13, wherein the plurality of bolts are fixed to the edge of the pitch bearing in the circumferential direction of the pitch bearing, and the two excitation bolts are arranged in the diameter direction of the pitch bearing.
16. The method of detecting a pitch bearing of claim 14, wherein the step of determining whether a crack exists in the plurality of bolts or the pitch bearing based on the magnitude of the direct current component comprises: determining that the first return bolt has a crack or that a portion of the pitch bearing close to the first return bolt has a crack in response to an attenuation of a direct current component obtained by a first return bolt of the two adjacent return bolts far from the ground point exceeding a first predetermined value and an attenuation of a direct current component obtained by a second return bolt of the two return bolts close to the ground point being lower than a second predetermined value, wherein the first predetermined value is larger than the second predetermined value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011020881.5A CN114252497B (en) | 2020-09-25 | 2020-09-25 | Wind generating set and detection device and detection method of variable pitch bearing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011020881.5A CN114252497B (en) | 2020-09-25 | 2020-09-25 | Wind generating set and detection device and detection method of variable pitch bearing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114252497A true CN114252497A (en) | 2022-03-29 |
| CN114252497B CN114252497B (en) | 2024-04-19 |
Family
ID=80790194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011020881.5A Active CN114252497B (en) | 2020-09-25 | 2020-09-25 | Wind generating set and detection device and detection method of variable pitch bearing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114252497B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183575A (en) * | 2011-02-21 | 2011-09-14 | 中国民航大学 | Composite sensor and composite-sensor-based aircraft engine gas circuit fault detection and diagnosis method |
| CN102520023A (en) * | 2011-11-09 | 2012-06-27 | 西安交通大学 | Crack monitoring device based on information intelligent coating and monitoring method of crack monitoring device |
| WO2018093882A1 (en) * | 2016-11-16 | 2018-05-24 | 3M Innovative Properties Company | Verifying structural integrity of materials using one or more current injection points and multiple current extraction points |
| CN108627551A (en) * | 2017-03-24 | 2018-10-09 | 东北林业大学 | Data collecting system and its hardware circuit for ERT standing tree failure detectors |
| US20190346395A1 (en) * | 2016-11-16 | 2019-11-14 | 3M Innovative Properties Company | Electrode placement for verifying structural intergrity of materials |
-
2020
- 2020-09-25 CN CN202011020881.5A patent/CN114252497B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183575A (en) * | 2011-02-21 | 2011-09-14 | 中国民航大学 | Composite sensor and composite-sensor-based aircraft engine gas circuit fault detection and diagnosis method |
| CN102520023A (en) * | 2011-11-09 | 2012-06-27 | 西安交通大学 | Crack monitoring device based on information intelligent coating and monitoring method of crack monitoring device |
| WO2018093882A1 (en) * | 2016-11-16 | 2018-05-24 | 3M Innovative Properties Company | Verifying structural integrity of materials using one or more current injection points and multiple current extraction points |
| US20190346395A1 (en) * | 2016-11-16 | 2019-11-14 | 3M Innovative Properties Company | Electrode placement for verifying structural intergrity of materials |
| CN108627551A (en) * | 2017-03-24 | 2018-10-09 | 东北林业大学 | Data collecting system and its hardware circuit for ERT standing tree failure detectors |
Non-Patent Citations (1)
| Title |
|---|
| 王承忠等: "用交流电位法测定疲劳裂纹扩展", 理化检验.物理分册, pages 12 - 15 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114252497B (en) | 2024-04-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105136435A (en) | Wind generating set blade fault diagnosis method and device | |
| CN104019000A (en) | Load spectrum determination and proactive maintenance system of wind generating set | |
| CN107781118B (en) | Blade of wind-driven generator health status monitoring system based on multi-sensor information | |
| CN102620807A (en) | System and method for monitoring state of wind generator | |
| CN105738806A (en) | Wind driven generator set fault diagnosis system and method | |
| CN202305007U (en) | Wind power generation motor and blade state on-line monitor | |
| CN1786721A (en) | On line detecting system with double Y connection wire power capacitor set | |
| CN103901111A (en) | Nondestructive detection system and method of blades of wind turbine generator system | |
| CN101876673A (en) | Extreme high voltage direct-current non-contact distance-measurement electricity-testing method | |
| GB2535583A (en) | Method and device for sub-synchronous oscillation protection in wind farms | |
| CN103575326A (en) | Compact-type wind turbine generator set signal detection device and method | |
| Jun et al. | An overview of condition monitoring and fault diagnostic for wind energy conversion system | |
| CN104296986A (en) | Bolt connecting state monitoring method and system based on addition substructure | |
| Yang et al. | Condition monitoring and fault diagnosis of a wind turbine with a synchronous generator using wavelet transforms | |
| CN106199428A (en) | High-power double feed wind power generator pilot system and TT&C system thereof | |
| CN203117391U (en) | Wind driven generator condition monitoring and intelligent analysis system | |
| CN204631187U (en) | A kind of buried high-tension cable partial discharge monitoring and positioning system | |
| CN114252497B (en) | Wind generating set and detection device and detection method of variable pitch bearing | |
| CN105332862A (en) | Method, device and system for detecting working state of wind turbine generator set | |
| CN111025096B (en) | XLPE cable aging state evaluation method based on leakage current characteristic factor | |
| CN107064673A (en) | Electric arc detecting device and double-fed wind power generator electric brush slip ring protection system | |
| CN108761297B (en) | Dry-type air-core reactor partial discharge fault on-line monitoring appearance based on high frequency signal | |
| CN116565816A (en) | Protection method and protection system for arc faults of high-voltage direct-current line | |
| CN107181460A (en) | A kind of photovoltaic system method for detecting arc | |
| CN114763784A (en) | On-line monitoring and fault early warning system for comprehensive health state of fan |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 830026 No. 107, Shanghai Road, Urumqi economic and Technological Development Zone, the Xinjiang Uygur Autonomous Region Applicant after: Jinfeng Technology Co.,Ltd. Address before: 830026 No. 107, Shanghai Road, Urumqi economic and Technological Development Zone, the Xinjiang Uygur Autonomous Region Applicant before: XINJIANG GOLDWIND SCIENCE & TECHNOLOGY Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |