Wind turbine generator cabin three-dimensional temperature field monitoring device

Abstract

The utility model discloses a wind turbine generator cabin three-dimensional temperature field monitoring device comprising a data acquisition module used for sensing and measuring the temperature in a wind turbine generator cabin; the acquisition synchronization module is used for carrying out initialization operation on the sensors and realizing same-frequency acquisition of all sensor signals; the temperature correction module is used for fusing the thermal imaging and the thermal signal to realize calculation and correction of the temperature of the digital thermal infrared imager; the image processing module is used for fusing and correcting the thermal image and the three-dimensional space information of the binocular visible light imaging equipment to obtain the real distribution of a three-dimensional temperature field in the cabin of the wind turbine generator; the micro-control unit is used for coordinating and controlling the whole device; according to the utility model, through MCU control, data fusion of the thermal resistance sensor and the digital thermal infrared imager and combination of three-dimensional space information of the binocular camera, high-precision and real-time three-dimensional temperature field monitoring is realized, the measurement precision and the fan safety are improved, and interference to the fan is reduced at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of cabin environment monitoring, in particular to a three-dimensional temperature field monitoring device for a wind turbine cabin. Background Art

[0002] In wind turbine design, the nacelle is typically enclosed to protect the internal equipment. Although cooling systems are installed for the main heat-generating components, some heat is inevitably transferred to the air inside the nacelle through the component surfaces. Due to the closed structure of the nacelle, air convection is minimal and the airflow heat exchange efficiency is low. If the cooling system is overloaded or fails, it will pose a significant safety hazard to the wind turbine. Therefore, understanding the actual temperature distribution within the nacelle is crucial for optimizing the heat dissipation structure.

[0003] Existing spatial three-dimensional temperature field measurement devices are mainly divided into two types: contact and non-contact. Contact temperature measurement methods, such as thermocouple arrays, can provide accurate point temperature data, but cannot directly measure continuous spatial temperature distribution. In addition, too few measurement points will lead to large errors in the results, while too many measurement points will interfere with the temperature distribution in the cabin and even increase the burden on the wind turbine. Non-contact temperature measurement methods, such as infrared thermal imaging and acoustic temperature measurement, can directly measure the continuous temperature distribution in the field of view, but still have limitations in high-precision three-dimensional temperature field reconstruction. Infrared thermal imaging cannot provide geometric information of the object to be measured, making it difficult to distinguish the temperatures of different objects in the image; the acoustic temperature measurement device has complex point layout and measurement process, requires a large amount of interpolation calculations, and is also not suitable for temperature distribution measurement inside the wind turbine cabin.

[0004] In summary, the main problems of these existing technologies include: traditional methods are difficult to obtain high-precision three-dimensional temperature field distribution, and temperature distribution measurement is inaccurate; a large amount of interpolation calculations and software fitting are required, which increases the complexity and time cost of data processing, and data processing is complicated; too many measuring points require a lot of installation and maintenance work, and are likely to interfere with the temperature distribution in the cabin, making installation and maintenance difficult; infrared thermal imaging is easily affected by factors such as the environment, radiation and reflection on the surface of objects, resulting in unstable measurement results and significant environmental impact; existing non-contact temperature measurement methods cannot provide geometric information of the object to be measured, making it difficult to fully understand the temperature distribution.

[0005] Therefore, there is an urgent need for a device that can monitor the three-dimensional temperature field inside the wind turbine nacelle in real time and accurately, so as to provide a direct basis for optimizing the heat dissipation structure inside the nacelle. Utility Model Content

[0006] The purpose of the utility model is to provide a three-dimensional temperature field monitoring device for a wind turbine cabin. The device realizes high-precision, real-time three-dimensional temperature field monitoring through MCU control, data fusion of thermal resistor sensors and digital infrared thermal imagers, and three-dimensional spatial information of binocular cameras, thereby improving measurement accuracy and wind turbine safety, reducing interference to the wind turbine, and solving problems in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A three-dimensional temperature field monitoring device for a wind turbine nacelle, comprising:

[0009] The data acquisition module is used to sense and measure the temperature inside the wind turbine cabin and transmit the signal to the microcontroller unit; the data acquisition module includes a digital infrared thermal imager, a thermal resistance sensor, and a binocular visible light imaging device;

[0010] The acquisition synchronization module is used to initialize the digital infrared thermal imager, thermal resistance sensor and binocular visible light imaging device to achieve the same frequency acquisition of all sensor signals;

[0011] The temperature correction module is used to fuse the thermal images collected by the digital infrared thermal imager and the thermal signals collected by the thermal resistance sensor to calculate and correct the temperature of the digital infrared thermal imager;

[0012] The image processing module is used to fuse and correct the three-dimensional spatial information of the thermal image and the binocular visible light imaging device, carry out the three-dimensional stereo construction process of the temperature field, and ultimately obtain the true three-dimensional temperature field distribution inside the wind turbine nacelle;

[0013] The microcontroller unit is used to coordinate and control the initialization, data acquisition synchronization, temperature correction, image processing and display process of the entire device; the microcontroller unit includes an arithmetic unit, a controller and a memory.

[0014] Preferably, the digital infrared thermal imager is used to obtain continuous temperature distribution within the field of view; the thermistor sensor is used to perform precise temperature measurement at specific points to provide a reference value for correcting the temperature measurement results of the infrared thermal imager; the binocular visible light imaging device is used to obtain three-dimensional spatial information inside the wind turbine cabin and generate a three-dimensional model through a stereo matching algorithm.

[0015] Preferably, the micro control unit is also connected to the display module signal, and the display module is used to display the three-dimensional temperature field distribution inside the wind turbine cabin in real time, so as to facilitate operators to monitor and analyze temperature data and ensure timely detection and handling of temperature anomalies.

[0016] Preferably, the micro control unit is connected to a power supply, and the power supply is used to supply power to the micro control unit.

[0017] Preferably, the digital infrared thermal imager is installed on the inner top of the wind turbine cabin, the binocular visible light imaging device is installed on an adjacent side of the digital infrared thermal imager, the field of view of the digital infrared thermal imager and the field of view of the binocular visible light imaging device overlap, and the thermistor sensor is fixed on the surface of the measuring component within the field of view of the digital infrared thermal imager.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. Compared with the method using only thermocouple resistors, the present invention has simpler measuring equipment, less interference with the fan itself, and will not affect the temperature distribution in the cabin or increase the burden on the fan due to too many measuring points. Compared with the method using only a thermal imager + binocular camera, the present invention ensures high-precision measurement and rapid correction. The microcontroller unit realizes the fusion of data in three different states, providing real-time three-dimensional temperature field distribution, facilitating the timely detection and treatment of temperature anomalies.

[0020] 2. The utility model obtains three-dimensional spatial information through binocular visible light imaging equipment, and combines it with the corrected thermal image to generate a highly restored three-dimensional temperature field model, providing a direct basis for the optimization of the heat dissipation structure.

[0021] 3. The utility model has a simple installation process and can be fixed in the cabin after calibration. No manual work is required beside the equipment during operation. The internal temperature of the cabin can be observed and monitored through the display module, which reduces maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a location diagram of the three-dimensional temperature field monitoring device of the present utility model;

[0023] Figure 2 For the utility model Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This is a schematic structural diagram of the monitoring device of the present utility model.

[0025] In the picture: 1. Digital infrared thermal imager; 2. Thermistor sensor; 3. Binocular visible light imaging device; 4. Power supply; 5. Wind turbine cabin. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In order to solve the problems of low temperature measurement accuracy, complex data processing, difficult installation and maintenance, and large environmental impact in the existing technology, the following technical solutions are proposed. Figure 1-3 ;

[0028] A three-dimensional temperature field monitoring device for a wind turbine cabin comprises a data acquisition module, an acquisition synchronization module, a temperature correction module, an image processing module and a micro control unit.

[0029] The data acquisition module is used to sense and measure the temperature inside the wind turbine nacelle 5 and transmit the signal to the microcontroller unit (MCU). The data acquisition module includes a digital infrared thermal imager 1, a thermistor sensor 2 and a binocular visible light imaging device 3.

[0030] The digital infrared thermal imager 1 is used to obtain the continuous temperature distribution within the field of view; the thermistor sensor 2 is used to perform accurate temperature measurement at specific points, providing a reference value for correcting the temperature measurement results of the infrared thermal imager; the binocular visible light imaging device 3 is used to obtain the three-dimensional spatial information inside the wind turbine nacelle 5 and generate a three-dimensional model through a stereo matching algorithm.

[0031] The binocular visible light imaging device 3 uses one of a Basler binocular camera, an Intel RealSense D415, and a ZED Mini.

[0032] The acquisition synchronization module is used to initialize the digital infrared thermal imager 1, the thermal resistance sensor 2 and the binocular visible light imaging device 3 to achieve the same-frequency acquisition of all sensor signals.

[0033] The acquisition synchronization module specifically uses Raspberry Pi as the main control unit, combined with Python scripts and GPIO interfaces to achieve acquisition synchronization.

[0034] Hardware requirements: Raspberry Pi and connection cables, as well as interface adapters corresponding to the digital infrared thermal imager 1, thermistor sensor 2, and the binocular visible light imaging device 3.

[0035] Software preparation: Install the Raspbian operating system, configure the Python environment, and install related libraries such as RPi.GPIO and OpenCV.

[0036] The acquisition synchronization module ensures synchronization of data acquisition among the digital infrared thermal imager 1 , the thermal resistor sensor 2 and the binocular visible light imaging device 3 , thereby avoiding data inconsistency caused by time difference.

[0037] The temperature correction module is used to fuse the thermal image collected by the digital infrared thermal imager 1 and the thermal signal collected by the thermal resistor sensor 2 to calculate and correct the temperature of the digital infrared thermal imager 1 and improve the accuracy of temperature measurement.

[0038] The detailed description of the temperature correction module is as follows:

[0039] Data preparation:

[0040] thermal_resistor_data: Contains the location and corresponding temperature value of thermal resistor sensor 2.

[0041] infrared_image: Temperature image acquired from digital infrared thermal imager 1.

[0042] Interpolation function:

[0043] Use interp1d to create a one-dimensional interpolation function that maps the position and temperature of RTD sensor 2 to each pixel in the image.

[0044] Calibration process:

[0045] Traverse each pixel of the infrared image and obtain its temperature value.

[0046] Use the interpolation function to calculate the corrected temperature at that location.

[0047] Applies a corrected temperature to each pixel in the infrared image.

[0048] Display results:

[0049] Use OpenCV to display the corrected temperature image.

[0050] The image processing module is used to fuse and correct the three-dimensional spatial information of the thermal image and the binocular visible light imaging device 3, carry out the three-dimensional stereo construction process of the temperature field, and finally obtain the true distribution of the three-dimensional temperature field inside the wind turbine nacelle 5.

[0051] The images captured by the binocular visible light imaging device 3 are stereo matched to obtain three-dimensional spatial information. The temperature information in the corrected thermal image is then spatially matched to obtain the true three-dimensional temperature field distribution inside the wind turbine nacelle 5. Specifically, dedicated image processing cards such as FPGAs (Field-Programmable Gate Arrays) or NVIDIA GeForce or Quadro series GPU accelerators can be used to provide powerful parallel computing and processing capabilities.

[0052] The detailed operation of the image processing module is as follows:

[0053] Calibration parameters: calibration_data contains the calibration parameters of the binocular visible light imaging device 3, such as the camera matrix, distortion coefficients, rotation matrix, and translation vector.

[0054] Stereo matching: Use cv2.StereoSGBM_create to create an SGBM stereo matcher and set related parameters; use stereo.compute to calculate the disparity map.

[0055] 3D point cloud generation: Use cv2.reprojectImageTo3D to convert the disparity map into a 3D point cloud.

[0056] Temperature information mapping: reads the digital infrared thermal imager 1 image and maps the temperature information into a three-dimensional point cloud.

[0057] The microcontroller unit coordinates and controls the initialization, data acquisition synchronization, temperature correction, image processing, and display processes of the entire device, ensuring efficient and accurate real-time monitoring of the three-dimensional temperature field within the wind turbine nacelle 5. The microcontroller unit includes an arithmetic unit, a controller, and memory. The STM32F4 series MCU was selected to build a control system, using the STM32CubeIDE as the development environment.

[0058] The MCU is also connected to a display module, which displays the three-dimensional temperature distribution inside the wind turbine nacelle 5 in real time. This facilitates operator monitoring and analysis of temperature data, ensuring timely detection and resolution of temperature anomalies. The display module utilizes a Nexcom industrial-grade network display for remote display.

[0059] The micro control unit is connected to a power supply 4 , which is used to supply power to the micro control unit.

[0060] The digital infrared thermal imager 1 is installed on the inner top of the wind turbine nacelle 5, and ensures that its field of view can cover the main heat-generating components and key areas; the binocular visible light imaging device 3 is installed on the adjacent side of the digital infrared thermal imager 1.

[0061] The field of view of the digital infrared thermal imager 1 and the field of view of the binocular visible light imaging device 3 overlap, thereby ensuring that the temperature data obtained by the digital infrared thermal imager 1 and the spatial information obtained by the binocular visible light imaging device 3 can be accurately matched.

[0062] The thermistor sensor 2 is fixed on the surface of the measuring component within the field of view of the digital infrared thermal imager 1. Usually, key heat-generating components or points that require precise temperature measurement are selected. For example, it is fixed on the surface of generators, inverters and other key electrical equipment to ensure that these points are within the field of view of the digital infrared thermal imager 1 and the binocular visible light imaging device 3.

[0063] The above installation method can ensure that the data of the digital infrared thermal imager 1, thermistor sensor 2 and the binocular visible light imaging device 3 can be effectively integrated, thereby achieving high-precision three-dimensional temperature field reconstruction and real-time monitoring.

[0064] The implementation process is as follows: before installation, the binocular visible light imaging device 3 and the digital infrared thermal imager 1 are systematically calibrated; the installation point is determined according to the actual position of the internal components of the wind turbine nacelle 5, and the main part of the device is fixed to the installation point; the thermal resistor sensor 2 is fixed to the surface of the measurement component within the field of view of the digital infrared thermal imager 1; the measurement equipment and the wind turbine are started; and the three-dimensional temperature field distribution inside the wind turbine nacelle 5 is viewed through the display module.

[0065] Working principle: During operation, the MCU initializes the digital infrared thermal imager 1, thermistor sensor 2 and the binocular visible light imaging device 3 through the acquisition synchronization module, and ensures that the data are collected at the same frequency; the temperature correction module fuses the temperature information obtained by the thermistor sensor 2 with the image of the digital infrared thermal imager 1 to achieve accurate correction of the temperature measurement result of the digital infrared thermal imager 1; the image processing module uses the three-dimensional spatial information provided by the binocular visible light imaging device 3, combined with the corrected thermal image, to construct a real three-dimensional model of the temperature distribution in the wind turbine nacelle 5.

[0066] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0067] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A three-dimensional temperature field monitoring device for a wind turbine nacelle, characterized in that: include: A data acquisition module is used to sense and measure the temperature in the wind turbine cabin (5) and transmit the signal to the micro control unit; The data acquisition module includes a digital infrared thermal imager (1), a thermal resistance sensor (2) and a binocular visible light imaging device (3); An acquisition synchronization module is used to initialize the digital infrared thermal imager (1), the thermal resistance sensor (2) and the binocular visible light imaging device (3) to achieve synchronous acquisition of all sensor signals; A temperature correction module is used to fuse the thermal image acquired by the digital infrared thermal imager (1) and the thermal signal acquired by the thermal resistance sensor (2) to realize the calculation and correction of the temperature of the digital infrared thermal imager (1); An image processing module is used to fuse and correct the three-dimensional spatial information of the thermal image and the binocular visible light imaging device (3), to carry out the three-dimensional stereo construction process of the temperature field, and finally obtain the true distribution of the three-dimensional temperature field inside the wind turbine cabin (5); The microcontroller unit is used to coordinate and control the initialization, data acquisition synchronization, temperature correction, image processing and display process of the entire device; the microcontroller unit includes an arithmetic unit, a controller and a memory.

2. A three-dimensional temperature field monitoring device for a wind turbine nacelle according to claim 1, characterized in that: The digital infrared thermal imager (1) is used to obtain continuous temperature distribution within the field of view; the thermal resistor sensor (2) is used to perform accurate temperature measurement at a specific point, providing a reference value for correcting the temperature measurement result of the infrared thermal imager; and the binocular visible light imaging device (3) is used to obtain three-dimensional spatial information inside the wind turbine cabin (5) and generate a three-dimensional model through a stereo matching algorithm.

3. A three-dimensional temperature field monitoring device for a wind turbine nacelle according to claim 2, characterized in that: The microcontrol unit is also connected to a display module signal, and the display module is used to display the three-dimensional temperature field distribution inside the wind turbine cabin (5) in real time, so as to facilitate operators to monitor and analyze temperature data and ensure timely detection and processing of temperature anomalies.

4. A three-dimensional temperature field monitoring device for a wind turbine nacelle according to claim 3, characterized in that: The micro control unit is connected to a power supply (4), and the power supply (4) is used to supply power to the micro control unit.

5. The three-dimensional temperature field monitoring device for a wind turbine nacelle according to claim 4, characterized in that: The digital infrared thermal imager (1) is installed on the inner top of the wind turbine cabin (5), the binocular visible light imaging device (3) is installed on an adjacent side of the digital infrared thermal imager (1), the field of view of the digital infrared thermal imager (1) and the field of view of the binocular visible light imaging device (3) overlap, and the thermal resistance sensor (2) is fixed on the surface of the measuring component within the field of view of the digital infrared thermal imager (1).

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