CN116576076A - Wind turbine generator tower clearance monitoring system and monitoring method - Google Patents
Wind turbine generator tower clearance monitoring system and monitoring method Download PDFInfo
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- CN116576076A CN116576076A CN202310438068.7A CN202310438068A CN116576076A CN 116576076 A CN116576076 A CN 116576076A CN 202310438068 A CN202310438068 A CN 202310438068A CN 116576076 A CN116576076 A CN 116576076A
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- 238000009434 installation Methods 0.000 claims description 57
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Classifications
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/20—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only
- H04N23/23—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from infrared radiation only from thermal infrared radiation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/695—Control of camera direction for changing a field of view, e.g. pan, tilt or based on tracking of objects
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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
- 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
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Abstract
The invention provides a wind turbine generator tower clearance monitoring system, which comprises a high-definition camera, a data acquisition and transmission module and a central processor, wherein the high-definition camera is arranged at the bottom of a cabin; the bottom of the tower is provided with a laser spot lamp; the invention also provides a monitoring method of the monitoring system, which combines video clearance monitoring and infrared thermal imaging monitoring technology to monitor tower clearance, can ensure effective monitoring of the tower clearance when the light intensity is low, and has high monitoring precision and accuracy.
Description
Technical Field
The invention relates to the technical field of wind turbine generator tower clearance monitoring, in particular to a wind turbine generator tower clearance monitoring system and a wind turbine generator tower clearance monitoring method.
Background
The clearance of the wind turbine generator tower refers to the minimum distance between the blade tip and the tower frame when the blade passes through the tower frame in the rotation process of the impeller. If the tower clearance is insufficient, the risk of collision between the blades and the tower may exist, so that in order to ensure safe operation of the wind turbine generator, the tower clearance of the wind turbine generator needs to be monitored, and how to monitor the tower clearance in real time becomes a technology which is important in the industry.
The current method for monitoring the clearance comprises video monitoring (such as patent CN115830484A, CN111336073A and CN 111911364A), laser radar monitoring (such as patent CN112267980A, CN113586367A and CN 115807741A) and infrared thermal imaging monitoring (such as CN112539143A and CN 217002157U), wherein the video clearance monitoring is a mainstream technology, has the advantages of mature technology and high monitoring precision, but has the problems of insufficient definition of imaging of blade tips and large error of monitoring precision under the condition of low light intensity such as dark light, windy sand, haze and the like at night; the laser radar monitoring is also greatly influenced by weather and atmosphere, and the monitoring accuracy is greatly influenced in heavy rain, dense smoke and dense fog morning weather; the infrared thermal imaging monitoring technology has the problems that when an infrared thermal imaging lens points to a tower and a blade, the ground is inevitably shot in, the ground temperature is high, and the difference of the temperatures of different positions of the ground is large, so that the brightness of the ground position in an image is high, and the monitoring precision is greatly influenced by the difference of the brightness.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides a wind turbine tower clearance monitoring system, which combines video clearance monitoring and infrared thermal imaging monitoring technologies to monitor the tower clearance, and can ensure effective monitoring of the tower clearance when the light intensity is low, and has high monitoring precision and good accuracy.
The technical scheme adopted for achieving the purposes of the invention is as follows:
the system for monitoring the clearance of the wind turbine generator tower comprises a high-definition camera, a data acquisition and transmission module and a central processing unit which are connected in sequence, wherein the high-definition camera is arranged at the bottom of a cabin at a position between the tower and a blade and faces the lower tower and the blade tip; the data acquisition and transmission module is also connected with an infrared thermal imager and a control module, the infrared thermal imager is also arranged at the bottom of the engine room and positioned between the tower and the blade, the installation surface of the infrared thermal imager on the engine room and the installation surface of the high-definition camera on the engine room are positioned on the same plane, the included angle lambda between the installation surface of the infrared thermal imager on the engine room and the installation surface of the high-definition camera on the engine room is 90 degrees, when the blade is seen from the tower, the infrared thermal imager is positioned at the left side of the high-definition camera, the infrared thermal imager faces the blade and turns to the direction of the tower from the high position, and the installation angles of the high-definition camera and the infrared thermal imager are adjustable; the bottom of the tower is provided with a laser spotlight, and the laser spotlight irradiates the tower and the blade tip;
the control module is connected with the infrared thermal imager and the laser spotlight, a light sensor is arranged in the control module, monitors the intensity of ambient light, transmits the monitored data to the control module and the data acquisition and transmission module, and controls the opening or closing of the infrared thermal imager and the laser spotlight according to the intensity of the light intensity data.
Under the windless condition, the included angle theta between the central line of the lens of the infrared thermal imager and the horizontal plane is more than or equal to-5 degrees and less than or equal to 15 degrees.
The high-definition camera is mounted at the bottom of the engine room through a first mounting bracket, the first mounting bracket comprises a first mounting plate, a first upper adjusting plate, a first lower adjusting plate and a camera mounting plate, the first mounting plate and the first upper adjusting plate are fixedly connected into a T-shaped structure, the first lower adjusting plate and the camera mounting plate are also fixedly connected into a T-shaped structure, a first fixing hole and a first adjusting hole are formed in the side edge of the first upper adjusting plate, the first adjusting hole is of an arc-shaped hole structure and takes the first fixing hole as a center, two first mounting holes are correspondingly formed in one side, far away from the camera mounting plate, of the first lower adjusting plate, the two first mounting holes are fixedly connected with the first fixing hole and the first adjusting hole through bolts, and the mounting angle between the first upper adjusting plate and the first lower adjusting plate is adjusted by changing the position of the bolts in the first adjusting holes; the high-definition camera is fixed on one face of keeping away from the first lower regulating plate on the camera mounting plate, and one face of keeping away from the first upper regulating plate on the first mounting plate is fixed in the cabin bottom to install the high-definition camera in the cabin bottom.
The first mounting plate is mounted at the bottom of the cabin in a bolting or bonding mode, and the camera mounting plate is connected with the high-definition camera in a bolting or bonding mode.
The infrared thermal imager is mounted at the bottom of the engine room through a second mounting bracket, the second mounting bracket comprises a second mounting plate, a second upper adjusting plate, a second lower adjusting plate and an infrared thermal imager mounting plate, the second mounting plate and the second upper adjusting plate are fixedly connected into a T-shaped structure, the second lower adjusting plate and the infrared thermal imager mounting plate are also fixedly connected into a T-shaped structure, a second fixing hole and a second adjusting hole are formed in one side, far away from the second mounting plate, of the second upper adjusting plate, the second adjusting hole is of an arc-shaped hole structure and takes the second fixing hole as a circle center, two second mounting holes are correspondingly formed in one side, far away from the infrared thermal imager mounting plate, of the second lower adjusting plate, the two second mounting holes are respectively fixedly connected with the second fixing hole and the second adjusting hole through bolts, and the mounting angle between the second upper adjusting plate and the second lower adjusting plate is adjusted by changing the positions of the bolts in the second adjusting holes; the infrared thermal imager is fixed on one surface, far away from the second lower adjusting plate, of the infrared thermal imager mounting plate, and one surface, far away from the second upper adjusting plate, of the second mounting plate is fixed on the bottom of the cabin, so that the infrared thermal imager is mounted on the bottom of the cabin.
The second mounting plate is mounted at the bottom of the cabin in a bolting or bonding mode, and the infrared thermal imager mounting plate is connected with the infrared thermal imager in a bolting or bonding mode.
The invention also provides a monitoring method of the wind turbine tower clearance monitoring system, which comprises the following steps: (1) Installing a high-definition camera and adjusting the installation angle of the high-definition camera, so that the high-definition camera shoots images of a tower and a blade tip below in real time, and an included angle alpha between the center line of a lens of the high-definition camera and an installation surface of the high-definition camera on a cabin is recorded;
(2) Installing an infrared thermal imager and adjusting the installation angle of the infrared thermal imager to enable the installation surface of the infrared thermal imager on the engine room and the installation surface of the high-definition camera on the engine room to be positioned on the same plane, wherein the included angle lambda between the installation surface of the infrared thermal imager on the engine room and the installation surface of the high-definition camera on the engine room is 90 degrees, the infrared thermal imager shoots images of the tip parts of the blades, and the included angle theta between the central line of a lens of the infrared thermal imager and the horizontal plane and the included angle beta between the central line of the lens of the infrared thermal imager and the installation surface of the infrared thermal imager on the engine room are recorded; recording the front-back distance L1 and the left-right distance L2 between the mounting surface of the high-definition camera on the engine room and the mounting surface of the infrared thermal imager on the engine room;
(3) Determining the relative position and the relative shooting angle of a lens of the high-definition camera and a lens of the infrared thermal imager in a three-dimensional space according to the structural size parameters of the high-definition camera and the mounting component thereof, the infrared thermal imager and the mounting component thereof and the parameters L1, L2, alpha and beta;
(4) The infrared thermal imaging device and the laser spotlight are connected with the control module, the high-definition camera, the infrared thermal imaging device and the control module are connected with the data acquisition and transmission module, and the data acquisition and transmission module is connected with the central processing unit;
in the running process of the wind turbine generator, a light sensor in a control module monitors the intensity of ambient light, and a data acquisition and transmission module receives image information shot by a high-definition camera and shot by an infrared thermal imager and an ambient light intensity signal monitored by the light sensor;
(5) When the intensity of the ambient light is greater than a set threshold, the control module does not start the infrared thermal imager and the laser spotlight, the central processing unit judges the position and the relative distance of the tower and the blade tip in the image according to the shape characteristics and gray scale contrast of the tower and the blade tip based on the image of the tower and the blade tip shot by the high-definition camera, and then calculates the minimum distance between the tower and the blade tip, namely the tower clearance value according to the proportion of the image size and the physical size;
(6) When the intensity of the ambient light is smaller than or equal to a set threshold value, the control module starts the infrared thermal imager and the laser spotlight, images of the blade tips are shot through the infrared thermal imager, images of the towers are shot through the high-definition camera, and image data are transmitted to the central processing unit through the data acquisition and transmission module; the central processing unit image processing software synthesizes the blade tip image shot by the infrared thermal imager and the tower image shot by the high-definition camera based on the relative positions and the relative shooting angles of the lens of the high-definition camera and the lens of the infrared thermal imager in the three-dimensional space; the method comprises the steps that in the process of rotating an impeller for one circle, blade tip images of the same blade at different positions are connected into a line, the line is prolonged to the position of a tower in a composite image, the distance between the extension line and the tower in the composite image is the representation of a tower clearance value in the image, and the actual tower clearance value can be calculated according to the proportion of the image size to the real size;
(7) And when the tower clearance value reaches a set threshold value, sending out early warning information.
Compared with the prior art, the technical scheme provided by the invention has the following advantages:
1. according to the wind turbine generator tower clearance monitoring system provided by the invention, under the condition of dark light such as at night, the high-definition camera is used for shooting images of the tower, the infrared thermal imager is used for shooting images of the blade tip, and according to the relative position and the relative shooting angle of the lens of the high-definition camera and the lens of the infrared thermal imager in the three-dimensional space, high-precision image synthesis is performed through the image processing software of the central processing unit, so that the tower clearance value is accurately identified and calculated, and the effective accuracy of tower clearance monitoring in the low light degree is ensured.
2. In the wind turbine tower clearance monitoring system provided by the invention, the high-definition camera is arranged at the bottom of the engine room through the first mounting bracket, the infrared thermal imager is arranged at the bottom of the engine room through the second mounting bracket, and the installation is stable and reliable; and the first installing support and the second installing support are simple in structure, and can conveniently and rapidly adjust the installation angles of the high-definition camera and the infrared thermal imager, so that the shooting directions of the high-definition camera and the infrared thermal imager are adjusted.
3. According to the invention, the included angle theta between the central line of the lens of the infrared thermal imager and the horizontal plane is more than or equal to-5 degrees and less than or equal to 15 degrees, and when the light is low at night, the infrared thermal imager takes the sky as the background when shooting the blade tip, the background temperature is relatively balanced, the difference is small, and the blade shape characteristics can be clearly compared and displayed, so that the blade tip can be effectively identified. The problems that in the prior art, the lens of the infrared thermal imager points to the ground, the ground temperature is high, and the brightness of the ground position in an image is high due to large temperature difference at different positions of the ground, so that the monitoring precision is greatly affected are effectively avoided.
4. According to the invention, under the condition that the light is dark at night, the high-definition camera can clearly shoot the image of the tower, and the accuracy of tower clearance monitoring is further improved when the light intensity is low.
5. In the invention, the laser spot lamp and the infrared thermal imaging device are both connected with the control module, the control module is internally provided with the light sensor, the light sensor monitors the intensity of ambient light and transmits the monitored data to the control module and the data acquisition and transmission module, and the control module controls the opening or closing of the infrared thermal imaging device and the laser spot lamp according to the intensity of the light intensity data.
Drawings
FIG. 1 is a schematic diagram of the installation of a high-definition camera and a thermal infrared imager on a wind turbine;
FIG. 2 is a schematic illustration of the connection of a first mounting plate of a first mounting bracket to a first upper adjustment plate of the present invention;
FIG. 3 is a schematic view of the connection of the first lower adjustment plate of the first mounting bracket and the camera mounting plate of the present invention;
fig. 4 is a schematic diagram of a connection structure between a first mounting bracket and a high-definition camera in the present invention;
FIG. 5 is a schematic illustration of the connection of a second mounting plate of a second mounting bracket to a second upper adjustment plate of the present invention;
FIG. 6 is a schematic illustration of the connection of a second lower adjustment plate of a second mounting bracket to a thermal infrared imager mounting plate of the present invention;
FIG. 7 is a schematic illustration of the connection of a second mounting bracket to a thermal infrared imager in accordance with the present invention;
FIG. 8 is a schematic diagram of the relative position of the high definition camera and the thermal infrared imager of FIG. 1;
FIG. 9 is a side view of the installation of the high definition camera of the present invention;
FIG. 10 is an elevation view of the infrared thermal imager of the present invention;
FIG. 11 is a top view of the relative positions of a high definition camera and a thermal infrared imager in accordance with the present invention;
FIG. 12 is a schematic representation of tower clearance D in a composite image;
in the figure: the blade tip imaging device comprises a 1-high-definition camera, a 2-infrared thermal imaging camera, a 31-tower, 32-blades, a 33-cabin, a 4-first mounting bracket, a 41-first mounting plate, a 42-first upper adjusting plate, 421-first fixing holes, 422-first adjusting holes, 43-first lower adjusting plate, 431-first mounting holes, 44-camera mounting plates, 5-second mounting brackets, 51-second mounting plates, 52-second upper adjusting plates, 521-second fixing holes, 522-second adjusting holes, 53-second lower adjusting plates, 531-second mounting holes, 54-infrared thermal imaging camera mounting plates, 6-high-definition camera mounting surfaces on the cabin, 7-infrared thermal imaging camera mounting surfaces on the cabin, 8-high-definition camera shooting tower images, and blade tip images of the same blade at different positions in the 9-impeller rotating process.
Detailed Description
The invention will now be described in more detail with reference to the drawings and examples.
The invention provides a wind turbine tower clearance monitoring system which comprises a high-definition camera 1, an infrared thermal imager 2, a laser spotlight, a control module, a data acquisition and transmission module and a central processing unit (the laser spotlight, the control module, the data acquisition and transmission module and the central processing unit are not shown in the figure).
The high-definition camera is installed at the bottom of the nacelle 33 at a position between the tower 31 and the blade 32 and faces the tower and the blade tip below, and captures image information of the tower and the blade tip below, and in this embodiment, the installation angle of the high-definition camera is adjustable. Specifically, the high definition digtal camera is installed in the cabin bottom through first installing support 4, and first installing support includes first mounting panel 41, first upper adjusting plate 42, first regulating plate 43 and camera mounting panel 44 down, and first mounting panel and first upper adjusting plate fixed connection become T font structure, and first regulating plate and camera mounting panel also fixed connection become T font structure down, in order to ensure to connect firmly, army's connection is fixed with the floor between first mounting panel and first upper adjusting plate and between first lower regulating plate and the camera mounting panel. Be provided with first fixed orifices 421 and first regulation hole 422 on the side of first regulation board, first regulation hole is the arc hole structure and uses first fixed orifices as the centre of a circle, the first regulation board that goes away from on the side of camera mounting panel corresponds and is provided with two first mounting holes 431, two first mounting holes pass through bolt fixed connection with first fixed orifices and first regulation hole respectively, through the position of change bolt in first regulation hole, adjust the installation angle between first regulation board and the first regulation board down. The high definition camera is fixed in the camera mounting panel through bolt or bonding's mode one side of keeping away from first regulating plate down, and the one side of first mounting panel of keeping away from first regulating plate is fixed in the cabin bottom through bolt or bonding's mode to install the high definition camera in the cabin bottom, here the mode of bolted connection, when the installation angle between first upper regulating plate and the first regulating plate was adjusted, the installation angle of high definition camera was adjusted thereupon, as shown in fig. 2-4.
The infrared thermal imager is also arranged at the bottom of the engine room and positioned between the tower and the blades, the installation surface 7 of the infrared thermal imager on the engine room and the installation surface 6 of the high-definition camera on the engine room are positioned on the same plane, and the included angle lambda between the installation surface of the infrared thermal imager on the engine room and the installation surface of the high-definition camera on the engine room is 90 degrees, as shown in fig. 11. In the embodiment, the installation angle of the infrared thermal imager is adjustable. Specifically, the infrared thermal imaging system is installed in the cabin bottom through the second installing support 5, the structure of second installing support is similar with the structure of first installing support, including second mounting panel 51, second upper adjusting plate 52, second lower adjusting plate 53 and infrared thermal imaging system mounting panel 54, second mounting panel and second upper adjusting plate fixed connection become T font structure, second lower adjusting plate and infrared thermal imaging system mounting panel also fixed connection become T font structure, in order to ensure that the connection is firm, armful be connected fixedly with the floor between first mounting panel and first upper adjusting plate and between first lower adjusting plate and the camera mounting panel. A second fixing hole 521 and a second adjusting hole 522 are formed in one side, far away from the second mounting plate, of the second upper adjusting plate, the second adjusting hole is of an arc-shaped hole structure and takes the second fixing hole as a circle center, two second mounting holes 531 are correspondingly formed in one side, far away from the mounting plate of the thermal infrared imager, of the second lower adjusting plate, the two second mounting holes are fixedly connected with the second fixing hole and the second adjusting hole through bolts respectively, and the mounting angle between the second upper adjusting plate and the second lower adjusting plate is adjusted by changing the position of the bolts in the second adjusting hole; the infrared thermal imager is fixed on one surface, far away from the second lower adjusting plate, of the infrared thermal imager mounting plate in a bolting or bonding mode, and one surface, far away from the second upper adjusting plate, of the second mounting plate is fixed on the bottom of the cabin in a bolting or bonding mode, so that the infrared thermal imager is mounted on the bottom of the cabin, and the infrared thermal imager is connected in a bolting mode. When the installation angle between the second upper adjusting plate and the second lower adjusting plate is adjusted, the installation angle of the infrared thermal imager is adjusted accordingly, as shown in fig. 5 to 7. When looking at the blade from the tower, the infrared thermal imager is located to the left of the high definition camera and the infrared thermal imager is turned from high to the tower orientation toward the blade, as shown in fig. 1 and 8.
Specifically, under the windless condition, the included angle theta between the central line of the lens of the infrared thermal imager and the horizontal plane is more than or equal to-5 degrees and less than or equal to 15 degrees, and under the condition of low light rays such as night, the infrared thermal imager takes the sky as the background when shooting the blade tip, the background temperature is more balanced and the difference is small, and the blade shape characteristics can be clearly compared and displayed, so that the blade tip can be effectively identified. The problems that in the prior art, the lens of the infrared thermal imager points to the ground, the ground temperature is high, and the brightness of the ground position in an image is high due to large temperature difference at different positions of the ground, so that the monitoring precision is greatly affected are effectively avoided.
The laser shot-light is installed in the bottom of pylon, and laser shot-light shines to pylon and blade tip. The control module is connected with the infrared thermal imaging instrument and the laser spotlight, a light sensor is arranged in the control module, monitors the intensity of ambient light, transmits the monitored data to the control module, and controls the opening or closing of the infrared thermal imaging instrument and the laser spotlight according to the intensity of the light.
The high-definition camera, the infrared thermal imager and the control module are all connected with the data acquisition and transmission module, the data acquisition and transmission module receives image data shot by the high-definition camera and the infrared thermal imager and an ambient light intensity signal monitored by the light sensor, and the data acquisition and transmission module is connected with the central processing unit in a wired or wireless mode, so that the received data are transmitted to the central processing unit, the central processing unit can analyze the image, and the positions of the tower and the blade tip can be identified according to the shape characteristics and the gray level characteristics.
The invention provides a monitoring method of a wind turbine tower clearance monitoring system, which comprises the following steps: (1) Installing a high-definition camera and adjusting the installation angle of the high-definition camera, so that the high-definition camera shoots images of a tower and a blade tip below in real time, and recording an included angle alpha between the center line of a lens of the high-definition camera and an installation surface (namely an installation surface of a first installation plate) of the high-definition camera on a cabin, as shown in fig. 9;
(2) The method comprises the steps of installing an infrared thermal imager and adjusting the installation angle of the infrared thermal imager, enabling an installation surface of the infrared thermal imager on a cabin (namely an installation surface of a second installation plate) to be on the same plane with an installation surface of a high-definition camera on the cabin (namely an installation surface of a first installation plate), enabling an included angle lambda between the installation surface of the infrared thermal imager on the cabin and the installation surface of the high-definition camera on the cabin to be 90 degrees, namely an included angle between the length direction of the second installation plate and the length direction of the first installation plate to be 90 degrees, enabling the infrared thermal imager to shoot images of blade tips, and recording an included angle theta between a lens center line of the infrared thermal imager and a horizontal plane and an included angle beta between the lens center line of the infrared thermal imager and the installation surface of the infrared thermal imager on the cabin; recording the front-back distance L1 and the left-right distance L2 between the mounting surface of the high-definition camera on the engine room and the mounting surface of the infrared thermal imager on the engine room, as shown in fig. 11;
(3) Determining the relative positions and the relative shooting angles of the lens of the high-definition camera and the lens of the infrared thermal imager in a three-dimensional space according to the structural dimensional parameters of the high-definition camera and the mounting component (a first mounting bracket) thereof, the infrared thermal imager and the mounting component (a second mounting bracket) thereof and the parameters L1, L2, alpha, theta and beta;
(4) The infrared thermal imaging device and the laser spotlight are connected with the control module, the high-definition camera, the infrared thermal imaging device and the control module are connected with the data acquisition and transmission module, and the data acquisition and transmission module is connected with the central processing unit;
in the running process of the wind turbine generator, a light sensor in a control module monitors the intensity of ambient light, and a data acquisition and transmission module receives image information shot by a high-definition camera and shot by an infrared thermal imager and an ambient light intensity signal monitored by the light sensor;
(5) When the intensity of the ambient light is greater than a set threshold, the control module does not start the infrared thermal imager and the laser spotlight, the central processing unit judges the position and the relative distance of the tower and the blade tip in the image according to the shape characteristics and gray scale contrast of the tower and the blade tip based on the image of the tower and the blade tip shot by the high-definition camera, and then calculates the minimum distance between the tower and the blade tip, namely the tower clearance value according to the proportion of the image size and the physical size;
(6) When the intensity of the ambient light is smaller than or equal to a set threshold value, the control module starts the infrared thermal imager and the laser spotlight, images of the blade tips are shot through the infrared thermal imager, images of the towers are shot through the high-definition camera, and image data are transmitted to the central processing unit through the data acquisition and transmission module; the CPU image processing software synthesizes the blade tip image shot by the infrared thermal imager and the tower image 8 shot by the high-definition camera based on the relative positions and the relative shooting angles of the lens of the high-definition camera and the lens of the infrared thermal imager in the three-dimensional space; connecting blade tip images 9 of the same blade at different positions in the process of rotating the impeller for one circle into a line, extending the line to the position of a tower in the composite image, wherein the distance D between the extension line and the tower in the composite image is the representation of a tower clearance value in the image, and according to the ratio of the image size to the physical size, the actual tower clearance value can be calculated as shown in FIG. 12;
(7) And when the tower clearance value reaches a set threshold value, sending out early warning information.
Claims (7)
1. The utility model provides a wind turbine tower clearance monitoring system, includes high definition digtal camera, data acquisition and transmission module and the central processing unit that connects gradually at least, its characterized in that: the high-definition camera is arranged at the bottom of the engine room at a position between the tower and the blade and faces the tower and the blade tip downwards; the data acquisition and transmission module is also connected with an infrared thermal imager and a control module, the infrared thermal imager is also arranged at the bottom of the engine room and positioned between the tower and the blade, the installation surface of the infrared thermal imager on the engine room and the installation surface of the high-definition camera on the engine room are positioned on the same plane, the included angle lambda between the installation surface of the infrared thermal imager on the engine room and the installation surface of the high-definition camera on the engine room is 90 degrees, when the blade is seen from the tower, the infrared thermal imager is positioned at the left side of the high-definition camera, the infrared thermal imager faces the blade and turns to the direction of the tower from the high position, and the installation angles of the high-definition camera and the infrared thermal imager are adjustable; the bottom of the tower is provided with a laser spotlight, and the laser spotlight irradiates the tower and the blade tip;
the control module is connected with the infrared thermal imager and the laser spotlight, a light sensor is arranged in the control module, monitors the intensity of ambient light, transmits the monitored data to the control module and the data acquisition and transmission module, and controls the opening or closing of the infrared thermal imager and the laser spotlight according to the intensity of the light intensity data.
2. The wind turbine tower clearance monitoring system of claim 1, wherein: under the windless condition, the included angle theta between the central line of the lens of the infrared thermal imager and the horizontal plane is more than or equal to-5 degrees and less than or equal to 15 degrees.
3. The wind turbine tower clearance monitoring system of claim 1, wherein: the high-definition camera is mounted at the bottom of the engine room through a first mounting bracket, the first mounting bracket comprises a first mounting plate, a first upper adjusting plate, a first lower adjusting plate and a camera mounting plate, the first mounting plate and the first upper adjusting plate are fixedly connected into a T-shaped structure, the first lower adjusting plate and the camera mounting plate are also fixedly connected into a T-shaped structure, a first fixing hole and a first adjusting hole are formed in the side edge of the first upper adjusting plate, the first adjusting hole is of an arc-shaped hole structure and takes the first fixing hole as a center, two first mounting holes are correspondingly formed in one side, far away from the camera mounting plate, of the first lower adjusting plate, the two first mounting holes are fixedly connected with the first fixing hole and the first adjusting hole through bolts, and the mounting angle between the first upper adjusting plate and the first lower adjusting plate is adjusted by changing the position of the bolts in the first adjusting holes; the high-definition camera is fixed on one face of keeping away from the first lower regulating plate on the camera mounting plate, and one face of keeping away from the first upper regulating plate on the first mounting plate is fixed in the cabin bottom to install the high-definition camera in the cabin bottom.
4. A wind turbine tower clearance monitoring system according to claim 3, wherein: the first mounting plate is mounted at the bottom of the cabin in a bolting or bonding mode, and the camera mounting plate is connected with the high-definition camera in a bolting or bonding mode.
5. The wind turbine tower clearance monitoring system of claim 1, wherein: the infrared thermal imager is mounted at the bottom of the engine room through a second mounting bracket, the second mounting bracket comprises a second mounting plate, a second upper adjusting plate, a second lower adjusting plate and an infrared thermal imager mounting plate, the second mounting plate and the second upper adjusting plate are fixedly connected into a T-shaped structure, the second lower adjusting plate and the infrared thermal imager mounting plate are also fixedly connected into a T-shaped structure, a second fixing hole and a second adjusting hole are formed in one side, far away from the second mounting plate, of the second upper adjusting plate, the second adjusting hole is of an arc-shaped hole structure and takes the second fixing hole as a circle center, two second mounting holes are correspondingly formed in one side, far away from the infrared thermal imager mounting plate, of the second lower adjusting plate, the two second mounting holes are respectively fixedly connected with the second fixing hole and the second adjusting hole through bolts, and the mounting angle between the second upper adjusting plate and the second lower adjusting plate is adjusted by changing the positions of the bolts in the second adjusting holes; the infrared thermal imager is fixed on one surface, far away from the second lower adjusting plate, of the infrared thermal imager mounting plate, and one surface, far away from the second upper adjusting plate, of the second mounting plate is fixed on the bottom of the cabin, so that the infrared thermal imager is mounted on the bottom of the cabin.
6. The wind turbine tower clearance monitoring system of claim 5, wherein: the second mounting plate is mounted at the bottom of the cabin in a bolting or bonding mode, and the infrared thermal imager mounting plate is connected with the infrared thermal imager in a bolting or bonding mode.
7. A method of monitoring a wind turbine tower clearance monitoring system according to claim 2, comprising the steps of: (1) Installing a high-definition camera and adjusting the installation angle of the high-definition camera, so that the high-definition camera shoots images of a tower and a blade tip below in real time, and an included angle alpha between the center line of a lens of the high-definition camera and an installation surface of the high-definition camera on a cabin is recorded;
(2) Installing an infrared thermal imager and adjusting the installation angle of the infrared thermal imager to enable the installation surface of the infrared thermal imager on the engine room and the installation surface of the high-definition camera on the engine room to be positioned on the same plane, wherein the included angle lambda between the installation surface of the infrared thermal imager on the engine room and the installation surface of the high-definition camera on the engine room is 90 degrees, the infrared thermal imager shoots images of the tip parts of the blades, and the included angle theta between the central line of a lens of the infrared thermal imager and the horizontal plane and the included angle beta between the central line of the lens of the infrared thermal imager and the installation surface of the infrared thermal imager on the engine room are recorded; recording the front-back distance L1 and the left-right distance L2 between the mounting surface of the high-definition camera on the engine room and the mounting surface of the infrared thermal imager on the engine room;
(3) Determining the relative position and the relative shooting angle of a lens of the high-definition camera and a lens of the infrared thermal imager in a three-dimensional space according to the structural size parameters of the high-definition camera and the mounting component thereof, the infrared thermal imager and the mounting component thereof and the parameters L1, L2, alpha and beta;
(4) The infrared thermal imaging device and the laser spotlight are connected with the control module, the high-definition camera, the infrared thermal imaging device and the control module are connected with the data acquisition and transmission module, and the data acquisition and transmission module is connected with the central processing unit;
in the running process of the wind turbine generator, a light sensor in a control module monitors the intensity of ambient light, and a data acquisition and transmission module receives image information shot by a high-definition camera and shot by an infrared thermal imager and an ambient light intensity signal monitored by the light sensor;
(5) When the intensity of the ambient light is greater than a set threshold, the control module does not start the infrared thermal imager and the laser spotlight, the central processing unit judges the position and the relative distance of the tower and the blade tip in the image according to the shape characteristics and gray scale contrast of the tower and the blade tip based on the image of the tower and the blade tip shot by the high-definition camera, and then calculates the minimum distance between the tower and the blade tip, namely the tower clearance value according to the proportion of the image size and the physical size;
(6) When the intensity of the ambient light is smaller than or equal to a set threshold value, the control module starts the infrared thermal imager and the laser spotlight, images of the blade tips are shot through the infrared thermal imager, images of the towers are shot through the high-definition camera, and image data are transmitted to the central processing unit through the data acquisition and transmission module; the central processing unit image processing software synthesizes the blade tip image shot by the infrared thermal imager and the tower image shot by the high-definition camera based on the relative positions and the relative shooting angles of the lens of the high-definition camera and the lens of the infrared thermal imager in the three-dimensional space; the method comprises the steps that in the process of rotating an impeller for one circle, blade tip images of the same blade at different positions are connected into a line, the line is prolonged to the position of a tower in a composite image, the distance between the extension line and the tower in the composite image is the representation of a tower clearance value in the image, and the actual tower clearance value can be calculated according to the proportion of the image size to the real size;
(7) And when the tower clearance value reaches a set threshold value, sending out early warning information.
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| CN118423238A (en) * | 2024-05-21 | 2024-08-02 | 济南银华信息技术有限公司 | Cabin thermal imaging monitoring device and method |
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| CN118423238A (en) * | 2024-05-21 | 2024-08-02 | 济南银华信息技术有限公司 | Cabin thermal imaging monitoring device and method |
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