A method and device for monitoring brake failure of a wind turbine generator based on thermal imaging technology

Abstract

The application provides a kind of method and device for monitoring brake failure of wind turbine based on thermal imaging technology, by equipment installation: install thermal imager at the position corresponding to the brake disc of wind turbine;Image acquisition: the data collected by thermal imager is transmitted to control system;Image preprocessing: image segmentation, feature extraction;Image analysis: preset each temperature value;Compare results: compare the actual monitoring temperature data with preset temperature data;Send alarm: send alarm according to result analysis;Solve the problem that prior art cannot detect fault reason, at the same time, through the effect of first-level alarm, second-level alarm and third-level alarm, eliminate the occurrence of high temperature problem of brake disc of motor set from the source, and then solve the problem of replacement, so that the wind turbine cannot work normally and cause loss, achieve the purpose of saving manpower and material resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of wind power generation technology, and particularly relates to a method and device for monitoring brake failure of a wind turbine generator based on thermal imaging technology. BACKGROUND

[0002] A wind turbine generator is used to convert the kinetic energy of wind into mechanical energy, and then convert the mechanical energy into electric energy, which is wind power generation. The principle of wind power generation is to use wind to drive the blades of a windmill to rotate, and then use a speed increaser to increase the rotation speed to promote the generation of electricity. According to the current windmill technology, a wind speed of about 3 meters per second (a degree of breeze) can start power generation. Wind power generation is becoming a hot trend in the world because it does not need to use fuel and does not produce radiation or air pollution. The device required for wind power generation is called a wind turbine generator set. The high-speed brake of the wind turbine generator set cooperates with the high-speed shaft brake disc to be used for emergency braking or temporary maintenance braking. The high-speed brake can be used to adopt a hydraulic way to hold or release the brake. When the brake is released, the brake pad of the high-speed brake does not contact the high-speed shaft brake disc. The prior art uses a thermistor protection circuit to protect the brake disc of the motor set from overheating, but this method cannot detect the cause of the failure. At the same time, when the thermistor protection circuit is used to solve the failure, since the thermistor is a one-time non-repairable temperature overheating fuse protection device, the circuit needs to be replaced after the thermistor is fused, and the wind turbine generator set cannot work during the replacement process. SUMMARY

[0003] The present application aims to provide a method and device for monitoring brake failure of a wind turbine generator based on thermal imaging technology, to solve the problem that the prior art cannot detect the cause of the failure and the wind turbine generator set cannot work during the replacement process.

[0004] In one aspect, the present application provides a method for monitoring brake failure of a wind turbine generator based on thermal imaging technology, comprising:

[0005] installing a thermal imager at a position corresponding to the brake disc of the wind turbine generator set;

[0006] transmitting the data collected by the thermal imager to a control system;

[0007] Image segmentation and feature extraction; the image segmentation and feature extraction comprises: gray processing of the wind turbine brake disc temperature image; gray conversion of the gray processed wind turbine brake disc temperature image, the gray conversion comprising: gray stretching of the wind turbine brake disc temperature image, so that the gray level occupies the entire region of pixel value 0-255; image segmentation of the wind turbine brake disc temperature image after the gray processing, the wind turbine brake disc temperature image after the gray processing is segmented into a plurality of specific regions with unique properties; feature extraction of the wind turbine brake disc temperature image after the image segmentation, the feature extraction of the specific region, i.e. the region of the wind turbine brake disc;

[0008] The preset temperature values are further included.

[0009] The actual monitoring temperature data is compared with the preset temperature data.

[0010] According to the result analysis, an alarm is issued.

[0011] Further, a thermal imager is installed at the position corresponding to the wind turbine brake disc, comprising:

[0012] A thermal imager is installed at the position corresponding to the wind turbine brake disc, the thermal imager has night vision function, and the thermal imager is connected to the control system through a transmission module.

[0013] Further, the data collected by the thermal imager is transmitted to the control system, comprising:

[0014] The thermal imager collects the data of the temperature of the wind turbine brake disc, and transmits the data collected by the thermal imager to the control system.

[0015] Further, the preset temperature values are included.

[0016] In the entire region of pixel value 0-255, each data represents a temperature data, wherein 0 is the minimum value and 255 is the maximum value, the preset normal working wind turbine brake disc temperature range is A, the actual monitoring wind turbine brake disc temperature is B, the wind turbine brake disc temperature range of the first level alarm is C, the wind turbine brake disc temperature range of the second level alarm is D, and the wind turbine brake disc temperature limit value is E, wherein the normal working wind turbine brake disc temperature range A, the actual monitoring wind turbine brake disc temperature B, the wind turbine brake disc temperature range C of the first level alarm, the wind turbine brake disc temperature range D of the second level alarm, and the wind turbine brake disc temperature limit value E are all in the entire region of pixel value 0-255.

[0017] Further, the actual monitoring temperature data is compared with the preset temperature data, comprising:

[0018] The actual monitored motor set brake disc temperature B is compared with the wind turbine brake disc temperature range A during normal operation, if the actual monitored motor set brake disc temperature B is within the wind turbine brake disc temperature range A during normal operation, no alarm is needed, if the actual monitored motor set brake disc temperature B is greater than the wind turbine brake disc temperature range A during normal operation, and is within the wind turbine brake disc temperature range C during the first alarm, the control system controls the alarm module to issue the first alarm, if the actual monitored motor set brake disc temperature B is greater than the wind turbine brake disc temperature range C during the first alarm, and is within the wind turbine brake disc temperature range D during the second alarm, the control system controls the alarm module to issue the second alarm, if the actual monitored motor set brake disc temperature B is greater than the wind turbine brake disc temperature range D during the second alarm, and reaches the wind turbine brake disc temperature limit value E, the overheat protection is started, and the third alarm is issued.

[0019] Further, according to the result analysis, an alarm is issued, including:

[0020] When the first alarm signal is received, the first alarm is issued, the time is recorded, the temperature is recorded, and the feedback is given to the control system, which is recorded to the display module by the control system;

[0021] When the second alarm signal is received, the second alarm is issued, the time is recorded, the temperature is recorded, and the feedback is given to the control system, which is recorded to the display module by the control system;

[0022] When the third alarm signal is received, the third alarm is issued, the time is recorded, the temperature is recorded, and the feedback is given to the control system, which is recorded to the display module by the control system.

[0023] In another aspect, the present application provides a device for monitoring the failure of wind turbine brake based on thermal imaging technology, comprising:

[0024] A thermal imager is used to collect temperature data of the wind turbine brake disc;

[0025] A transmission module is used to transmit the temperature data of the wind turbine brake disc collected by the thermal imager;

[0026] A control system is used to receive the temperature data of the wind turbine brake disc collected by the thermal imager, process the collected temperature data of the wind turbine brake disc, and make the alarm module issue an alarm according to the comparison result;

[0027] A display module is used to display the number of alarms, the alarm time, and the alarm temperature;

[0028] A comparison module is used to compare the collected temperature data of the wind turbine brake disc with the preset temperature data;

[0029] An alarm module is configured to issue an alarm according to the comparison result.

[0030] The present application provides a method and device for monitoring brake failure of a wind turbine based on thermal imaging technology, which is installed at a position corresponding to a brake disc of the wind turbine, and the data collected by the thermal imager is transmitted to a control system, image preprocessing is performed, including image segmentation and feature extraction, image analysis is performed by presetting temperature values, the actual monitored temperature data is compared with the preset temperature data, and an alarm is issued according to the result analysis. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0032] Fig. 1 A flowchart of a method for monitoring brake failure of a wind turbine based on thermal imaging technology provided by the present application is shown in the figure.

[0033] Fig. 2 A general diagram of the idea of a method for monitoring brake failure of a wind turbine based on thermal imaging technology provided by the present application is shown in the figure.

[0034] Fig. 3 A schematic diagram of a device for monitoring brake failure of a wind turbine based on thermal imaging technology provided by the present application is shown in the figure. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below in combination with specific embodiments of the present application and corresponding drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. The technical solutions provided by the embodiments of the present application will be described in detail below in combination with the drawings.

[0036] Please refer to Figs. 1-2 The present application provides a method for monitoring brake failure of a wind turbine based on thermal imaging technology, which comprises:

[0037] S101: Device installation: install the thermal imager at the position corresponding to the brake disc of the wind turbine generator.

[0038] The device installation in this embodiment: install the thermal imager at the position corresponding to the brake disc of the wind turbine generator, comprising:

[0039] Install the thermal imager at the position corresponding to the brake disc of the wind turbine generator. The thermal imager has night vision function. Everything in nature, whether it is the polar ice, flame, human body, or even the extremely cold deep space, will have infrared radiation as long as its temperature is higher than absolute zero-273℃, due to the thermal motion of the molecules inside the object. Its radiation energy is proportional to the fourth power of its own temperature, and the wavelength of the radiation is inversely proportional to its temperature. The infrared imaging technology is based on the detection of the radiation energy of the object. The thermal imaging has the advantages of fast response, no disturbance to the target temperature, long distance or non-contact target temperature measurement, and intuitive temperature distribution, which is perfectly matched with the application in the brake disc of the wind turbine generator, and prevents the temperature fluctuation from affecting the result;

[0040] The thermal imager is connected to the control system through the transmission module.

[0041] S102: Image acquisition: transmit the data collected by the thermal imager to the control system.

[0042] The image acquisition in this embodiment: transmit the data collected by the thermal imager to the control system, comprising:

[0043] The thermal imager collects the data of the temperature of the brake disc of the wind turbine generator, and transmits the data collected by the thermal imager to the control system.

[0044] S103: Image preprocessing: image segmentation and feature extraction.

[0045] The image preprocessing in this embodiment: image segmentation and feature extraction, comprising:

[0046] The temperature image of the brake disc of the wind turbine generator is subjected to grayscale processing.

[0047] The grayscale temperature image of the brake disc of the wind turbine generator is subjected to grayscale conversion, which includes: the grayscale of the temperature image of the brake disc of the wind turbine generator is stretched, so that the gray level occupies the entire region of pixel value 0-255.

[0048] Image segmentation is performed on the grayscale processed wind turbine brake disc temperature image. The image is segmented into several specific regions with unique properties. In each region to be segmented, a seed point is selected as the starting point for growth. Pixels with similarity features satisfying a specified growth criterion are searched within the seed point's neighborhood. These pixels are then merged with the region containing the seed point. The merged pixel is used as the new seed point, and the search and merging process continues until no new images can be merged. The basic idea of ​​region growing is to group pixels with similar properties to form regions. First, a seed point is selected as the starting point for growth in each region to be segmented. Then, pixels with similarity features satisfying a specified growth criterion are searched within the seed point's neighborhood and merged with the region containing the seed point. The newly merged pixel is then used as the new seed point, and the search and merging process continues until no more pixels can be merged. This paper uses a region growing algorithm to determine candidate character regions.

[0049] Feature extraction is performed on the segmented wind turbine brake disc temperature image. This involves extracting features from a specific region, namely the area around the wind turbine brake disc. Feature extraction transforms a set of measurements for a given pattern to highlight representative features. It utilizes image analysis and transformation to extract desired features. Points in the image are divided into subsets, which may consist of isolated points, continuous curves, or continuous regions. Each pixel is examined to determine if it represents a feature.

[0050] S104: Image Analysis: Preset various temperature values.

[0051] Image analysis in this embodiment: preset temperature values, including:

[0052] Within the pixel value range of 0-255, each data point represents a temperature value, with 0 being the lowest and 255 the highest. The preset normal operating temperature range for the wind turbine brake disc is A, the actual monitored brake disc temperature is B, the temperature range under a Level 1 alarm is C, the temperature range under a Level 2 alarm is D, and the extreme temperature range is E. Where A < C < D < E, the normal operating temperature range A, the actual monitored brake disc temperature B, the Level 1 alarm temperature range C, the Level 2 alarm temperature range D, and the extreme temperature value E all fall within the pixel value range of 0-255.

[0053] S105: Comparison Results: Compare the actual monitored temperature data with the preset temperature data.

[0054] The comparison result in this embodiment: compare the actually monitored temperature data with the preset temperature data, including:

[0055] Compare the actually monitored motor set brake disc temperature B with the wind turbine set brake disc temperature range A during normal operation. If the actually monitored motor set brake disc temperature B is within the wind turbine set brake disc temperature range A during normal operation, no alarm is needed. If the actually monitored motor set brake disc temperature B is greater than the wind turbine set brake disc temperature range A during normal operation and within the first-level alarm wind turbine set brake disc temperature range C, the control system controls the alarm module to issue a first-level alarm. If the actually monitored motor set brake disc temperature B is greater than the first-level alarm wind turbine set brake disc temperature range C and within the second-level alarm wind turbine set brake disc temperature range D, the control system controls the alarm module to issue a second-level alarm. If the actually monitored motor set brake disc temperature B is greater than the second-level alarm wind turbine set brake disc temperature range D and reaches the wind turbine set brake disc temperature limit value E, the overheat protection is started, and a third-level alarm is issued.

[0056] S106: issuing an alarm: issuing an alarm according to the result analysis.

[0057] When a first-level alarm signal is received, a first-level alarm is issued, the time is recorded, the temperature is recorded, and feedback is given to the control system, which is recorded on the display module.

[0058] When a second-level alarm signal is received, a second-level alarm is issued, the time is recorded, the temperature is recorded, and feedback is given to the control system, which is recorded on the display module.

[0059] When a third-level alarm signal is received, a third-level alarm is issued, the time is recorded, the temperature is recorded, and feedback is given to the control system, which is recorded on the display module.

[0060] The alarm issued in this embodiment: issuing an alarm according to the result analysis, including:

[0061] Please refer to Fig. 3 The present application provides a device for monitoring the failure of wind turbine brakes based on thermal imaging technology, comprising:

[0062] Thermal imager 601: collecting temperature condition data of the wind turbine brake disc;

[0063] Transmission module 602: transmitting the temperature condition data of the wind turbine brake disc collected by the thermal imager;

[0064] Control system 603: receiving the temperature condition data of the wind turbine brake disc collected by the thermal imager, processing the collected temperature condition data of the wind turbine brake disc, and causing the alarm module to issue an alarm according to the comparison result;

[0065] The display module 604 displays the number of alarms, the alarm time and the alarm temperature.

[0066] The comparison module 605 compares the collected temperature data of the wind turbine brake disc with preset temperature data.

[0067] The alarm module 606 issues an alarm according to the comparison result.

[0068] The application provides a method and device for monitoring the failure of a wind turbine brake based on thermal imaging technology. The use principle is as follows: firstly, the device is installed, the thermal imager collects temperature image data of the position corresponding to the wind turbine brake disc, the thermal imager collects the temperature image data of the position corresponding to the wind turbine brake disc, and the control system pre-processes the temperature image data of the position corresponding to the wind turbine brake disc collected by the thermal imager. The temperature range of the wind turbine brake disc during normal operation is A, the actual monitored temperature of the motor set brake disc is B, the temperature range of the wind turbine brake disc during the first level alarm is C, the temperature range of the wind turbine brake disc during the second level alarm is D, and the temperature range of the wind turbine brake disc during the limit value is E. The actual monitored temperature B of the motor set brake disc is compared with the temperature range A of the wind turbine brake disc during normal operation. If the actual monitored temperature B of the motor set brake disc is within the temperature range A of the wind turbine brake disc during normal operation, no alarm is needed. If the actual monitored temperature B of the motor set brake disc is greater than the temperature range A of the wind turbine brake disc during normal operation and within the temperature range C of the wind turbine brake disc during the first level alarm, the control system controls the alarm module to issue a first level alarm. If the actual monitored temperature B of the motor set brake disc is greater than the temperature range C of the wind turbine brake disc during the first level alarm and within the temperature range D of the wind turbine brake disc during the second level alarm, the control system controls the alarm module to issue a second level alarm. If the actual monitored temperature B of the motor set brake disc is greater than the temperature range D of the wind turbine brake disc during the second level alarm and reaches the limit value E of the wind turbine brake disc, the overheat protection is started, and a third level alarm is issued. Through the various levels of alarms, the problem of circuit replacement can be effectively reduced.

[0069] Those skilled in the art can clearly understand that the technology in the embodiments of the application can be realized by means of software and necessary general hardware platforms. Based on such understanding, the technical solutions in the embodiments of the application can be embodied in the form of a software product, which can be stored in a storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, etc., and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the method of the various embodiments or some parts of the embodiments of the application.

[0070] The above embodiments of the application do not constitute a limitation on the protection scope of the application.

Claims

1. A method of monitoring brake failure of a wind turbine generator based on thermography, characterized in that, The application relates to a wind turbine brake disc temperature monitoring system. The application comprises the following steps: installing a thermal imager at the position corresponding to the wind turbine brake disc; transmitting the data collected by the thermal imager to a control system; gray-scale processing the wind turbine brake disc temperature image; gray-scale conversion of the wind turbine brake disc temperature image, which comprises the following steps: gray-scale stretching the wind turbine brake disc temperature image so that the gray scale occupies the entire region of pixel value 0-255; image segmentation of the wind turbine brake disc temperature image after the gray-scale processing, which divides the wind turbine brake disc temperature image after the gray-scale processing into a plurality of specific regions with unique properties; feature extraction of the wind turbine brake disc temperature image after the image segmentation, which extracts the features of the specific regions, i.e. the regions at the wind turbine brake disc; presetting temperature values; comparing the actual monitoring temperature data with the preset temperature data; sending an alarm according to the result analysis; The preset temperature values comprise the following steps: in the entire region of pixel value 0-255, each data represents a temperature data, wherein 0 is the minimum value and 255 is the maximum value; the wind turbine brake disc temperature range during normal operation is A, the actual monitoring wind turbine brake disc temperature is B, the wind turbine brake disc temperature range during the first-level alarm is C, the wind turbine brake disc temperature range during the second-level alarm is D, and the wind turbine brake disc temperature limit value is E; wherein the wind turbine brake disc temperature range A during normal operation, the actual monitoring wind turbine brake disc temperature B, the wind turbine brake disc temperature range C during the first-level alarm, the wind turbine brake disc temperature range D during the second-level alarm and the wind turbine brake disc temperature limit value E are all in the entire region of pixel value 0-255; comparing the actual monitoring temperature data with the preset temperature data comprises the following steps: comparing the actual monitoring wind turbine brake disc temperature B with the wind turbine brake disc temperature range A during normal operation; if the actual monitoring wind turbine brake disc temperature B is within the wind turbine brake disc temperature range A during normal operation, no alarm is needed; if the actual monitoring wind turbine brake disc temperature B is greater than the wind turbine brake disc temperature range A during normal operation and within the wind turbine brake disc temperature range C during the first-level alarm, the control system controls the alarm module to send the first-level alarm; if the actual monitoring wind turbine brake disc temperature B is greater than the wind turbine brake disc temperature range C during the first-level alarm and within the wind turbine brake disc temperature range D during the second-level alarm, the control system controls the alarm module to send the second-level alarm; if the actual monitoring wind turbine brake disc temperature B is greater than the wind turbine brake disc temperature range D during the second-level alarm and reaches the wind turbine brake disc temperature limit value E, the overheat protection is started and the third-level alarm is sent; sending an alarm according to the result analysis comprises the following steps: sending the first-level alarm when the first-level alarm signal is received, recording the time and temperature and feeding back to the control system and recording on the display module of the control system; sending the second-level alarm when the second-level alarm signal is received, recording the time and temperature and feeding back to the control system and recording on the display module of the control system; When receiving the third level alarm signal, the third level alarm is sent, the time is recorded, the temperature is recorded, and the feedback is given to the control system, and the control system is recorded to the display module.

2. A method of monitoring brake failure of a wind turbine generator based on thermography according to claim 1, characterized in that, The thermal imager is installed at a position corresponding to the brake disc of the wind turbine generator set, and the thermal imager has a night vision function. The thermal imager is installed at a position corresponding to the brake disc of the wind turbine generator set, and the thermal imager has a night vision function.

3. A method of monitoring brake failure in a wind turbine generator based on thermography according to claim 1, characterized in that, The data collected by the thermal imager is transmitted to the control system, and the data collected by the thermal imager is transmitted to the control system. The thermal imager collects the temperature data of the brake disc of the wind turbine generator set, and transmits the data collected by the thermal imager to the control system.

4. A device for monitoring brake failure of a wind turbine generator based on thermal imaging technology, applied to the method for monitoring brake failure of a wind turbine generator based on thermal imaging technology according to any one of claims 1 to 3, characterized in that, The thermal imager collects the temperature data of the brake disc of the wind turbine generator set, and transmits the data collected by the thermal imager to the control system. The thermal imager is used to collect the temperature data of the brake disc of the wind turbine generator set. The transmission module is used to transmit the temperature data of the brake disc of the wind turbine generator set collected by the thermal imager. The control system is used to receive the temperature data of the brake disc of the wind turbine generator set collected by the thermal imager, process the collected temperature data of the brake disc of the wind turbine generator set, and send an alarm according to the comparison result. The display module is used to display the number of alarms, the alarm time, and the alarm temperature. The comparison module is used to compare the collected temperature data of the brake disc of the wind turbine generator set with the preset temperature data. The alarm module is used to send an alarm according to the comparison result.

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