CN114718819A - Fan blade clearance monitoring method and system based on tower-based millimeter wave range finder - Google Patents
Fan blade clearance monitoring method and system based on tower-based millimeter wave range finder Download PDFInfo
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- CN114718819A CN114718819A CN202210343392.6A CN202210343392A CN114718819A CN 114718819 A CN114718819 A CN 114718819A CN 202210343392 A CN202210343392 A CN 202210343392A CN 114718819 A CN114718819 A CN 114718819A
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- 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
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- 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
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- 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
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Abstract
The invention discloses a tower-based millimeter wave distance meter-based fan blade clearance monitoring method and system, which are used for reading fault codes and clearance value L of the millimeter wave distance meter in real timeMeasured in factAnd transmitting the distance measurement value to a PLC control system of the fan, judging whether the blade runs in a safe clearance area or a non-safe clearance area according to the distance measurement value under the normal condition of the distance measurement value, and comparing the safe clearance value L1Low speed variable blade clearance value L2Medium speed variable pitch clearance value L3And a shutdown clearance value L4The size of the pitch control device is determined, so that how to change the pitch or stop the wind turbine is determined, and the safe operation of the wind turbine is ensured; when finding that the range finding value data is unusual, judge concrete millimeter wave distancer behavior through millimeter wave distancer's fault code to promote the reliability. The invention can meet the requirement of high-adaptability monitoring of various severe weather and complex environments, has high reliability and accuracy, simple and convenient calibration, low cost and convenient installation and later maintenance, and has great practical significance.
Description
Technical Field
The invention relates to the technical field of wind power generation, in particular to a fan blade clearance monitoring method and system based on a tower-based millimeter wave range finder.
Background
With the development of wind power generation technology, the blades of the wind turbine are longer and longer, which means that the blades are softer and softer, and the blades are very large in deformation in the rotation process and may cause danger when hitting a tower drum, so that it is necessary to monitor the distance between the wind turbine blades and the tower drum in real time, that is, the clearance between the lower blade tips of the blades and the outer wall of the tower drum.
At present, a common method for monitoring clearance between blades and a tower barrel in the industry is to install a laser range finder at a cabin position and dynamically monitor the clearance of the blades along with real-time yawing of the cabin. However, the laser wavelength is short, the penetrability is poor, the interference capability of resisting severe weather such as rain, snow, fog and the like is poor, and the normal weather monitoring can only be met. Compare laser, the wavelength of millimeter wave is longer, and the penetrability ability is strong, and is strong to the interference ability of bad weather such as anti sleet fog, can satisfy the headroom monitoring of various bad weather.
If arrange clearance monitoring sensor in tower section of thick bamboo outer wall and blade lower lobe tip equidistance position, because millimeter wave distancer mounting height is lower lobe tip height, apart from ground 20 meters at least, installation and later maintenance need equipment such as professional crane and hanging flower basket, very inconvenient, and installation cost and maintenance cost are very high.
In addition, other clearance monitoring methods are studied as follows:
if the clearance monitoring sensor is arranged on the blade tip, firstly, the installation and later maintenance are inconvenient, and the cost is high; secondly, because the linear velocity of the blade is very large, which is comparable to high-speed rails, the sensor is extremely easy to be thrown out due to huge centrifugal force, so that the sensor is damaged and the safety of people around the fan is endangered; again, sensors mounted to the blade tip can affect blade aerodynamics. If the clearance monitoring sensor is arranged at the position of a blade root in the blade, the clearance of the blade is indirectly measured by measuring the deformation of the blade, firstly, only the middle position of the blade can be monitored, and the blade tip cannot be monitored; secondly, the relation between the blade deformation and the load needs to be accurately obtained, and the blade clearance is further obtained through the calibration relation between the load and the blade clearance, so that the field reality is very difficult, the monitoring method is indirect, the error is very large and is difficult to be accurate, and the requirement on monitoring the blade clearance is relatively accurate. If the method such as camera or video monitoring is adopted, even normal weather exists, the night monitoring effect is poor, the blade cannot be accurately identified, the monitoring effect is influenced by strong sunlight at noon in the daytime, and the effect is worse if the weather is severe such as rain, snow, fog and the like.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the existing fan blade clearance monitoring technology, provides a fan blade clearance monitoring method based on a tower-based millimeter wave range finder, can meet the requirements of high-adaptability monitoring of various severe weather and complex environments, is high in reliability and accuracy, simple and convenient to calibrate, low in cost, convenient to install and maintain at a later stage, and has great practical significance.
The invention provides a fan blade clearance monitoring system based on a tower-based millimeter wave range finder.
The first purpose of the invention is realized by the following technical scheme: firstly, determining a safe clearance value L from the lower blade tip of a blade operated by a fan to the outer wall of a tower barrel through simulation calculation1Lower, lowerClearance value L of variable-speed propeller2Medium speed variable pitch clearance value L3And a shutdown clearance value L4(ii) a Secondly, according to the triangle pythagorean theorem, calculating the elevation angle of the installation tool of the millimeter wave range finder through the height of the lower blade tip of the blade, the clearance value from the lower blade tip to the outer wall of the tower barrel and the distance between the installation position of the millimeter wave range finder and the lower blade tip; finally, the millimeter wave range finder is installed at a position near a tower footing, the millimeter wave range finder is adjusted to a pre-calculated elevation angle position through an inclination angle sensor integrated in the millimeter wave range finder, the millimeter wave range finder is adjusted to a clearance monitoring area near a lower leaf tip, and installation and positioning of the range finder are completed; in addition, because the monitoring range of the millimeter wave range finder is a sector area, a section of the blade from the lower blade tip of the blade to the blade root can be monitored, clearance misinformation caused by non-blade behaviors can be avoided, and therefore the accuracy of clearance alarming is improved;
after the installation is finished, when the fan runs, the blade clearance is monitored and controlled in real time according to the following method:
if clearance value L measured by millimeter wave range finderMeasured in factGreater than safe clear value L1At the moment, the blades operate in a safe clearance area without any treatment, and the fan continues to operate normally;
if clearance value L measured by millimeter wave range finderMeasured in factLess than or equal to safe clear space value L1At the moment, the blade is acted by strong wind and operates in a non-safety clearance area, and the clearance value L measured by the millimeter wave distance meter is further comparedMeasured in factSimulated low-speed variable-pitch net empty value L2Medium speed variable pitch clearance value L3Shutdown clearance value L4The size is determined according to the following method:
if the clearance value L of the low-speed variable propeller2Clearance L < measured by millimeter wave range finderMeasured in factLess than or equal to safe clear space value L1The fan changes the pitch angle to increase through low-speed pitch variationThe operation safety of the fan is ensured by increasing the clearance value;
if the clearance value L of the medium-speed variable propeller is L3Clearance L < measured by millimeter wave range finderMeasured in factLess than or equal to the low-speed variable-pitch net empty value L2If the wind turbine is in the middle speed variable pitch mode, increasing the pitch angle to increase the clearance value to ensure the running safety of the wind turbine;
if the machine is stopped, the net empty value L4Clearance L < measured by millimeter wave range finderMeasured in factClearance value L of variable pitch at medium speed or less3The fan increases the pitch angle through high-speed variable pitch to increase the clearance value to ensure the safe operation of the fan;
if clearance value L measured by millimeter wave range finderMeasured in factShutdown clearance value L or less4And the fan is ensured to run safely by stopping the fan to stop rotating.
Further, the millimeter wave range finder is integrated with a start-stop code and a fault code; the clearance is large when the fan is in a shutdown state and in a low-power operation state, so that the problem of unsafe clearance does not exist, and the start-stop code is added to control the millimeter wave distance meter to be turned on and off, so that the millimeter wave distance meter can be controlled to be automatically turned off by the start-stop code when the fan is in the shutdown state and in the low-power operation state, and the service life of the millimeter wave distance meter is prolonged; the fault code is used for feeding back whether the millimeter wave distance measuring instrument normally operates or not, the operation condition of the millimeter wave distance measuring instrument can be known in real time, and the fault conditions of different millimeter wave distance measuring instruments can be fed back in time when data abnormity occurs.
Furthermore, an inclination angle sensor is arranged in the millimeter wave range finder and used for determining the elevation angle of the millimeter wave range finder, the millimeter wave range finder is adjusted to a clearance monitoring area near the lower blade tip, and the millimeter wave range finder is located through the inclination angle sensor during later maintenance and verification of the elevation angle deviation.
The second purpose of the invention is realized by the following technical scheme: the system reads the parameters related to clearance of the fan from a PLC control system of the fan, carries out logic judgment on the read parameters, and when the read parameters meet the requirement of blade clearance monitoring, the system reads the parameters related to clearanceWhen the clearance monitoring access condition, blade clearance monitoring mode can be cut into automatically to whole blade clearance monitoring system, and the start-stop code of control millimeter wave distancer is opened, makes the millimeter wave distancer be in operating condition, otherwise, then controls the start-stop code of millimeter wave distancer and continues to close, can let the fan when shut down state and miniwatt operation do not have the unsafe problem of clearance like this, and millimeter wave distancer is out of work, prolongs millimeter wave distancer's life: wherein, under the blade clearance monitoring mode, the system reads the fault code and clearance value L of the millimeter wave distance meter in real timeMeasured in factAnd the PLC control system transmits the distance measurement value to the fan, judges whether the blade runs in a safe clearance area or a non-safe clearance area according to the distance measurement value under the normal condition of the distance measurement value, and compares the safe clearance value L1Low speed variable blade clearance value L2Medium speed variable pitch clearance value L3Shutdown clearance value L4The size of the pitch control device is determined, so that how to change the pitch or stop the wind turbine is determined, and the safe operation of the wind turbine is ensured; when finding that the range finding value data is unusual, this system judges concrete millimeter wave distancer behavior through the fault code of millimeter wave distancer to promote the reliability of whole set of blade headroom monitoring system.
Further, the clearance-related parameters include an operating state, power, wind speed, wind wheel speed, pitch angle, and wind wheel azimuth of the wind turbine.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. compared with laser, the millimeter wave range finder has longer wavelength, stronger penetrability, stronger anti-interference performance in severe weather such as rain, snow, fog and the like and better complex environment adaptability.
2. Millimeter wave distancer compares the laser and can only monitor a point, several points or face, can monitor certain fan-shaped region, consequently can monitor the blade tip and to the longer section blade of blade root direction, and the accuracy of test result is higher.
3. The millimeter wave range finder compares and shoots and video monitoring, can not arrive evening or the effect variation poor when light is darker, can reach same effect daytime and evening.
4. Compared with a method of mounting the millimeter wave range finder on a lower blade tip, the millimeter wave range finder is mounted at the position of a tower footing, and the mounting and maintenance difficulty and cost are reduced.
5. Compared with some indirect measurement methods (such as inferring load change through blade deformation and then inferring clearance change) by adopting a direct monitoring method, the method has the advantages that the acquired data can be directly judged without conversion and calibration of various physical quantities, the method is simple, the result is accurate, and the operation burden of the acquisition device is reduced.
6. The invention is directed to a safe clearance value L1Low speed variable blade clearance value L2Medium speed variable pitch clearance value L3Shutdown clearance value L4Different clearance areas adopt different control means, so that the safety of the fan is ensured, and the generating capacity is improved to the maximum extent;
7. the millimeter wave distance meter integrates the start-stop code, and the fan is disconnected when the millimeter wave distance meter is shut down or runs at low power, so that the service life of the millimeter wave distance meter is prolonged, and the cost is reduced.
8. The millimeter wave range finder integrates the tilt angle sensor, is simple and convenient to install, later maintains, adjusts and verifies the tilt angle, and is integrated, so that the accuracy of tilt angle adjustment is higher.
9. The millimeter wave range finder can output fault codes, know the running state of the millimeter wave range finder in real time and feed back the working condition of a clearance monitoring system in time.
Drawings
FIG. 1 is a schematic view of a fan blade clearance monitoring apparatus.
FIG. 2 is a schematic view of monitoring a plurality of millimeter wave distance meters around the tower footing.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.
Example 1
As shown in figure 1, a cabin 3 of a fan is installed at the top of a tower 5, a PLC control system 1 of the fan is installed in a tower footing control cabinet of the tower 5, and a wind wheel consisting of three blades 4 rotates clockwise after absorbing wind energy.
The embodiment provides a fan blade clearance monitoring method based on a tower-based millimeter wave range finder, which has the following specific conditions:
firstly, determining a safe clearance value L from the lower tip of a blade 4 operated by a fan to the outer wall of a tower 5 through simulation calculation1Low speed variable blade clearance value L2Medium-speed variable pitch clearance value L3And a shutdown clearance value L4(ii) a Secondly, according to the triangle pythagorean theorem, the elevation angle of the installation tool of the millimeter wave range finder is calculated through the height of the lower blade tip of the blade 4, the clearance value from the lower blade tip to the outer wall of the tower tube 5 and the distance between the installation position of the millimeter wave range finder 2 and the lower blade tip; finally, the millimeter wave range finder 2 is installed at a height position of 2-3 meters near a tower footing, a plurality of millimeter wave range finders 2 are installed along the periphery of the tower 5 at 360 degrees, as shown in fig. 2, the millimeter wave range finders 2 are adjusted to a pre-calculated elevation angle position through tilt sensors integrated in the millimeter wave range finders 2, the millimeter wave range finders 2 are guaranteed to be adjusted to a clearance monitoring area near the lower blade tip, and installation and positioning of the range finders are completed; in addition, because the monitoring range of the millimeter wave range finder 2 is a sector area, a section of the blade from the lower tip of the blade 4 to the root of the blade can be monitored, clearance misinformation caused by non-blade behaviors can be avoided, and therefore the accuracy of clearance alarm is improved.
After the installation is finished, when the fan runs, the blade clearance is monitored and controlled in real time according to the following method:
if clearance value L measured by millimeter wave range finderMeasured in factGreater than safe clearance value L1At the moment, the blades operate in a safe clearance area without any treatment, and the fan continues to operate normally;
if clearance value L measured by millimeter wave range finderMeasured in factLess than or equal to safe clear space value L1At the moment, the blade is acted by strong wind and operates in a non-safety clearance area, and the millimeter wave distance measurement is further comparedMeasured clearance value LMeasured in factSimulated low-speed variable-pitch net empty value L2Medium speed variable pitch clearance value L3Shutdown clearance value L4The size is determined according to the following method:
if the clearance value L of the low-speed variable propeller2Clearance L < measured by millimeter wave range finderMeasured actuallyLess than or equal to safe clear value L1The fan increases the pitch angle through low-speed variable pitch to increase the clearance value to ensure the safe operation of the fan;
if the clearance value L of the medium-speed variable propeller is L3Clearance L < measured by millimeter wave range finderMeasured actuallyLow speed variable propeller clear value L2If the wind turbine is in the middle speed variable pitch mode, increasing the pitch angle to increase the clearance value to ensure the running safety of the wind turbine;
if the machine is stopped, the net empty value L4Clearance L < measured by millimeter wave range finderMeasured in factClearance value L of variable pitch at medium speed or less3The fan increases the pitch angle through high-speed pitch variation to increase the clearance value so as to ensure the safe operation of the fan;
if clearance value L measured by millimeter wave range finderMeasured in factShutdown clearance value L or less4And the fan is ensured to run safely by stopping the fan to stop rotating.
Further, the millimeter wave distance meter 2 is integrated with a start-stop code and a fault code; because the clearance of the fan is large when the fan is in a shutdown state and runs at low power, the problem of unsafe clearance does not exist, and the start-stop code is added to control the millimeter wave distance meter 2 to be opened and closed, so that the millimeter wave distance meter 2 can be controlled to be automatically shut down through the start-stop code when the fan is in the shutdown state and runs at low power, and the service life of the millimeter wave distance meter 2 is prolonged; the fault code is used for feeding back whether the millimeter wave distance measuring instrument 2 normally operates, the operation condition of the millimeter wave distance measuring instrument 2 can be known in real time, and the fault condition of different millimeter wave distance measuring instruments 2 can be fed back in time when data abnormity occurs.
Further, 2 internal configuration inclination sensors of millimeter wave distancer for confirm 2 elevation angles of millimeter wave distancer, guarantee that 2 adjustment of millimeter wave distancer are to near the lower lobe tip headroom monitoring area, compare and adopt outside inclination sensor to adjust the angle, both saved plenty of time and work load, more accurate than outside inclination sensor when adjusting millimeter wave distancer angle, promote the accuracy of millimeter wave distancer angle modulation better. And the later maintenance and the location of the angle deviation can be realized through the tilt angle sensor, and the method is simpler and more convenient.
Example 2
The embodiment provides a fan blade clearance monitoring system based on a tower-based millimeter wave range finder, which can realize the fan blade clearance monitoring method based on the tower-based millimeter wave range finder described in embodiment 1, the system can be integrated into a PLC control system 1 of a fan, and can also be separated out independently, the system mainly reads the parameters related to clearance of the fan from the PLC control system 1 of the fan, including the running state, power, wind speed, wind wheel rotating speed, pitch angle, wind wheel azimuth angle and the like of the fan, and carries out logic judgment on the read parameters, when the read parameters meet the blade clearance monitoring access condition, the whole blade clearance monitoring system can automatically switch into a blade clearance monitoring mode, controls the start and stop codes of the millimeter wave range finder 2 to be opened, enables the millimeter wave range finder 2 to be in a working state, otherwise, controls the start and stop codes of the millimeter wave range finder 2 to be continuously closed, so can let the fan when the clearance is not dangerous problem in the shut down state and miniwatt operation, millimeter wave distancer 2 is out of work, prolongs millimeter wave distancer 2's life: wherein, in the blade clearance monitoring mode, the system reads the fault code and clearance value L of the millimeter wave distance meter 2 in real timeMeasured in factAnd the PLC control system 1 transmits the distance measurement value to the fan, judges whether the blade runs in a safe clearance area or a non-safe clearance area according to the distance measurement value under the normal condition of the distance measurement value, and compares the safe clearance value L1Low speed variable blade clearance value L2Medium speed variable pitch clearance value L3Shutdown clearance value L4The size of the pitch control device is larger than that of the pitch control device, so that how to change the pitch or stop the wind turbine is determined, and the safe operation of the wind turbine is ensured; when finding that the range finding value data is unusual, this system judges concrete millimeter wave distancer 2 behavior through the fault code of millimeter wave distancer 2 to promote the reliability of whole set of blade headroom monitoring system.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so that the changes in the shape and principle of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. A fan blade clearance monitoring method based on a tower-based millimeter wave range finder is characterized by comprising the following steps: firstly, determining a safe clearance value L from the lower blade tip of a blade operated by a fan to the outer wall of a tower barrel through simulation calculation1Low speed variable blade clearance value L2Medium speed variable pitch clearance value L3And a shutdown clearance value L4(ii) a Secondly, according to the triangle pythagorean theorem, calculating the elevation angle of the installation tool of the millimeter wave range finder through the height of the lower blade tip of the blade, the clearance value from the lower blade tip to the outer wall of the tower barrel and the distance between the installation position of the millimeter wave range finder and the lower blade tip; finally, the millimeter wave range finder is installed at a position near a tower footing, the millimeter wave range finder is adjusted to a pre-calculated elevation angle position through an inclination angle sensor integrated in the millimeter wave range finder, the millimeter wave range finder is adjusted to a clearance monitoring area near a lower blade tip, and installation and positioning of the range finder are completed; in addition, because the monitoring range of the millimeter wave range finder is a sector area, a section of the blade from the lower blade tip to the blade root can be monitored, clearance misinformation caused by non-blade behaviors can be avoided, and therefore the accuracy of clearance alarming is improved;
after the installation is finished, when the fan runs, the blade clearance is monitored and controlled in real time according to the following method:
if clearance value L measured by millimeter wave range finderMeasured actuallyGreater than safe clearance value L1At the moment, the blades operate in a safe clearance area without any treatment, and the fan continues to operate normally;
if clearance value L measured by millimeter wave range finderMeasured in factLess than or equal to safe clear value L1When the blade is receivedThe strong wind acts on the non-safety clearance area to operate, and the clearance value L measured by the millimeter wave distance meter is further comparedMeasured in factSimulated low-speed variable-pitch net empty value L2Medium speed variable pitch clearance value L3Shutdown clearance value L4The size is determined according to the following method:
if the clearance value L of the low-speed variable propeller2Clearance L < measured by millimeter wave range finderMeasured in factLess than or equal to safe clear space value L1The fan increases the pitch angle through low-speed variable pitch to increase the clearance value to ensure the safe operation of the fan;
if the clearance value L of the medium-speed variable propeller is L3Clearance L < measured by millimeter wave range finderMeasured in factLess than or equal to the low-speed variable-pitch net empty value L2If the wind turbine is in the middle speed variable pitch mode, increasing the pitch angle to increase the clearance value to ensure the running safety of the wind turbine;
if the machine is stopped, the net empty value L4Clearance L < measured by millimeter wave range finderMeasured in factClearance value L of variable pitch at medium speed or less3The fan increases the pitch angle through high-speed variable pitch to increase the clearance value to ensure the safe operation of the fan;
if clearance value L measured by millimeter wave range finderMeasured in factShutdown clearance value L or less4And the fan is ensured to run safely by stopping the fan to stop rotating.
2. The tower-based millimeter wave range finder based fan blade clearance monitoring method of claim 1, wherein: the millimeter wave range finder is integrated with a start-stop code and a fault code; the clearance is large when the fan is in a shutdown state and in a low-power operation state, so that the problem of unsafe clearance does not exist, and the start-stop code is added to control the millimeter wave distance meter to be turned on and off, so that the millimeter wave distance meter can be controlled to be automatically turned off by the start-stop code when the fan is in the shutdown state and in the low-power operation state, and the service life of the millimeter wave distance meter is prolonged; the fault code is used for feeding back whether the millimeter wave distance measuring instrument normally operates or not, the operation condition of the millimeter wave distance measuring instrument can be known in real time, and the fault conditions of different millimeter wave distance measuring instruments can be fed back in time when data abnormity occurs.
3. The tower-based millimeter wave range finder based fan blade clearance monitoring method of claim 1, wherein: the millimeter wave range finder is internally provided with the tilt sensor and used for determining the elevation angle of the millimeter wave range finder, ensuring that the millimeter wave range finder is adjusted to a clearance monitoring area near a lower blade tip, and positioning through the tilt sensor during later maintenance and verification of elevation angle deviation.
4. The fan blade clearance monitoring system based on the tower-based millimeter wave range finder is characterized in that the fan blade clearance monitoring method based on the tower-based millimeter wave range finder is applied to any one of claims 1 to 3, the system reads the parameters of the fan related to the clearance from a PLC control system of the fan and carries out logic judgment on the read parameters, when the read parameters meet the blade clearance monitoring access conditions, the whole blade clearance monitoring system can automatically switch into a blade clearance monitoring mode to control the start-stop code of the millimeter wave range finder to be opened so that the millimeter wave range finder is in a working state, otherwise, the start-stop code of the millimeter wave distance meter is controlled to be continuously closed, so that the millimeter wave distance meter does not work when the fan is in a shutdown state and runs in a low power state without the problem of unsafe clearance, and the service life of the millimeter wave distance meter is prolonged: under the blade clearance monitoring mode, the system reads the fault code and the clearance value L of the millimeter wave distance meter in real timeMeasured in factAnd the PLC control system transmits the distance measurement value to the fan, judges whether the blade runs in a safe clearance area or a non-safe clearance area according to the distance measurement value under the normal condition of the distance measurement value, and compares the safe clearance value L1Low speed variable blade clearance value L2Medium speed variable pitch clearance value L3Shutdown clearance value L4The size of the pitch control device is larger than that of the pitch control device, so that how to change the pitch or stop the wind turbine is determined, and the safe operation of the wind turbine is ensured; when finding that the range finding value data is unusual, this system judges concrete millimeter wave distancer behavior through the fault code of millimeter wave distancer to promote the reliability of whole set of blade headroom monitoring system.
5. The tower-based millimeter wave range finder based fan blade clearance monitoring system of claim 4, wherein: the clearance related parameters comprise the running state, the power, the wind speed, the rotating speed of the wind wheel, the pitch angle and the azimuth angle of the wind wheel of the wind turbine.
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115199483A (en) * | 2022-07-11 | 2022-10-18 | 南京牧镭激光科技有限公司 | Health state monitoring method based on laser clearance radar |
CN116008970A (en) * | 2023-03-27 | 2023-04-25 | 南京牧镭激光科技股份有限公司 | Method for verifying radar null value inversion accuracy based on video image |
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2022
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115199483A (en) * | 2022-07-11 | 2022-10-18 | 南京牧镭激光科技有限公司 | Health state monitoring method based on laser clearance radar |
CN115199483B (en) * | 2022-07-11 | 2023-11-10 | 南京牧镭激光科技股份有限公司 | Health state monitoring method based on laser clearance radar |
CN116008970A (en) * | 2023-03-27 | 2023-04-25 | 南京牧镭激光科技股份有限公司 | Method for verifying radar null value inversion accuracy based on video image |
CN116008970B (en) * | 2023-03-27 | 2024-01-05 | 南京牧镭激光科技股份有限公司 | Method for verifying radar null value inversion accuracy based on video image |
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