CN221037749U - Calibration device of photovoltaic panel temperature measurement system - Google Patents
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- 230000008054 signal transmission Effects 0.000 claims abstract description 37
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Abstract
The application provides a calibration device of a photovoltaic panel temperature measurement system, and relates to the field of photovoltaic panels. The detection optical fiber is used for being paved on the photovoltaic panel to be detected. The calibration module comprises a sealing cavity, a calibration optical fiber and a temperature sensor, wherein the calibration optical fiber and the temperature sensor are arranged in the sealing cavity, one end of the calibration optical fiber is connected with the detection optical fiber, and the temperature sensor is used for monitoring the temperature in the sealing cavity. The signal transmission module is connected with the calibration optical fiber and is used for transmitting the light pulse to the calibration module and the detection optical fiber and processing the light signal into an electric signal. The data processing module is connected with the signal transmission module and is used for receiving the electric signals processed by the signal transmission module. According to the calibration device of the photovoltaic panel temperature measurement system, the calibration module is arranged as the reference data, so that the accuracy of detected data is ensured when any component in the photovoltaic panel temperature measurement system is replaced, and the temperature measurement efficiency is improved.
Description
Technical Field
The application relates to the field of photovoltaic panels, in particular to a calibration device of a photovoltaic panel temperature measurement system.
Background
The photovoltaic panel is one of the indispensable power generation devices in the solar photovoltaic power generation system, and almost all the photovoltaic panel is composed of thin solid photovoltaic cells made of semiconductor materials. With the rise of new energy industry, the solar photovoltaic power generation industry is rapidly developed. The laying area of the photovoltaic panel is enlarged, the construction site is gradually complicated, and more fire safety hazards exist. Thus, photovoltaic panel temperature detection is one of the indispensable photovoltaic panel maintenance steps.
The existing photovoltaic panel temperature detection comprises an infrared imaging technology, a photoelectric sensor and the like, however, the existing photovoltaic panel temperature detection technology still has a detection blind area in the detection process, and has the problems of large temperature measurement range, low detection efficiency and the like. Therefore, distributed sensing technology for realizing detection by paving the optical fibers on the photovoltaic panel is gradually emerging. The existing distributed sensing technology mainly realizes temperature sensing according to a two-way demodulation scheme, namely a section of reference optical fiber is preset to be placed in a known temperature, other conditions are unchanged, the reference optical fiber is placed in an environment to be measured, temperature signals carried under different conditions of the optical fiber are respectively collected through a system, and the temperature signals and the known temperature data are substituted into a demodulation formula to be calculated, so that sensing of the environment to be measured is realized.
However, in the existing distributed sensing technology, when any component is replaced, the calibration is needed again, and the temperature measurement efficiency is affected.
Disclosure of utility model
In view of the above, the present application provides a calibration device for a temperature measurement system of a photovoltaic panel, which is used for solving the problem that any element needs to be recalibrated when replacing in the existing distributed sensing technology, so as to ensure the temperature measurement efficiency.
In order to achieve the above purpose, the application provides a calibration device of a photovoltaic panel temperature measurement system, which adopts the following technical scheme:
The application provides a calibration device of a photovoltaic panel temperature measurement system, which comprises a detection optical fiber, a calibration module, a signal transmission module and a data processing module.
The detection optical fiber is used for being paved on a photovoltaic panel to be detected.
The calibration module comprises a sealing cavity, a calibration optical fiber and at least one temperature sensor, wherein the calibration optical fiber and the temperature sensor are arranged in the sealing cavity, one end of the calibration optical fiber is connected with the detection optical fiber, the temperature sensor is used for monitoring the temperature in the sealing cavity where the calibration optical fiber is located, and the temperature in the sealing cavity is a preset temperature.
The signal transmission module is connected with the calibration optical fiber and is used for transmitting light pulses to the calibration module and the detection optical fiber, the light pulses form first light and second light carrying temperature information at the positions of the detection optical fiber and the calibration module, and the signal transmission module is also used for processing light signals carried by the first light and the second light into electric signals.
The data processing module is connected with the signal transmission module and is used for receiving the electric signals processed by the signal transmission module, obtaining a preset temperature value through a temperature sensor and calculating to obtain the temperature of the photovoltaic panel.
According to the technical scheme, when the temperature of the photovoltaic panel is required to be detected, the data processing module sends a control signal to the signal transmission module, the signal transmission module transmits light pulses to the calibration module and the detection optical fiber, then the detection optical fiber and the calibration optical fiber generate Raman scattering under the interaction of optical fiber molecules and generate first light and second light with temperature information, the signal transmission module collects and processes the first light signal and the second light signal generated by the detection optical fiber and the calibration optical fiber into electric signals, the data processing module receives the electric signals processed by the signal transmission module, the temperature sensor obtains a specific value of the preset temperature in the sealing cavity, detects a temperature signal of the calibration optical fiber at the preset temperature, and calculates the temperature signal as reference data through the data processing module to obtain the temperature of the detection optical fiber, namely the temperature of the photovoltaic panel; by setting the calibration module as reference data, the temperature signal detection error caused by environmental condition change when the optical fiber is replaced in the environment to be measured after the data is recorded in the known temperature environment is avoided, so that the accuracy of the detected data is still ensured when any component in the photovoltaic panel temperature measurement system is replaced, and the temperature measurement efficiency is improved.
In one possible implementation, the scaling module further comprises a closed housing box, and the sealing cavity is arranged in the housing box.
Through the technical scheme, the calibration optical fiber and the temperature sensor are arranged in the closed accommodating box, so that the constant environment where the calibration optical fiber is positioned is ensured, the accuracy of detecting data of the temperature sensor due to the influence of external factors of the accommodating box is avoided, and the detection efficiency of the calibration optical fiber is ensured.
In one possible implementation, a fixing pile is provided in the accommodating box, and the calibration optical fiber is wound on the fixing pile.
Through above-mentioned technical scheme, through twining the optical fiber that scales on the spud pile, improved the distribution homogeneity of the optical fiber that scales in holding the box, ensured the stability that the optical fiber that scales carried temperature signal in holding the box.
In one possible implementation, the number of the temperature sensors is at least two, and each temperature sensor is uniformly spaced around the axial direction of the fixing pile.
Through above-mentioned technical scheme, through evenly setting up temperature sensor around the spud for temperature sensor carries out circumference to the calibration optic fibre of winding on the spud, and the data that data processing module will detect a plurality of temperature sensor later averages, has improved the accuracy of detected data.
In one possible implementation, at least one of the detection fiber and the targeting fiber is a sensing fiber.
Through the technical scheme, the sensing optical fiber has the characteristics of sensitivity, electromagnetic interference resistance and the like, and at least one of the detection optical fiber and the calibration optical fiber is set as the sensing optical fiber, so that the stability of system detection is improved, and the accuracy of detection data is further ensured.
In one possible implementation, the signal transmission module includes a pulse laser, where the pulse laser is connected to the data processing module and the scaling module, and the pulse laser is configured to receive a control signal sent by the data processing module and transmit the optical pulse to the detection optical fiber and the scaling module.
Wherein said detection fiber and said scaling module will produce said first light and said second light upon receipt of said light pulses.
The first light is stokes light, and the second light is anti-stokes light.
According to the technical scheme, when the temperature of the detection optical fiber and the calibration optical fiber is required to be detected, the data processing module sends a control signal to the pulse laser, then the pulse laser generates light pulses with preset frequency, the calibration optical fiber and the detection optical fiber receive the light pulses and interact with optical fiber molecules to generate Raman scattering, then stokes light and anti-stokes light with temperature information are generated, the pulse laser is installed to convert an electric signal into an optical signal, and the signal conveying efficiency is ensured.
In one possible implementation, the signal delivery module further includes a wavelength division multiplexer connecting the pulse laser and the scaling fiber, the wavelength division multiplexer for delivering optical pulses to the detection fiber and the scaling module and collecting the stokes light and the anti-stokes light.
Through the technical scheme, after the pulse laser emits light pulses, the light pulses are transmitted to the calibration optical fiber and the detection optical fiber through the wavelength division multiplexer, and then the stokes light and the anti-stokes light generated by the calibration optical fiber and the detection optical fiber are collected by the wavelength division multiplexer, so that the collection of the light signals by the signal transmission module is realized, and the light signals are processed.
In a possible implementation manner, the signal transmission module further includes a photodetector, where the photodetector is connected to the wavelength division multiplexer and the data processing module, and the photodetector is configured to process the stokes light and the anti-stokes light collected by the wavelength division multiplexer into electrical signals and transmit the electrical signals to the data processing module.
Through the technical scheme, after the Stokes light and the anti-Stokes light are collected to the wavelength division multiplexer, the photoelectric detector processes the collected Stokes light and anti-Stokes light into electric signals, and finally data information is transmitted to the data processing module, so that the signal transmission module processes the optical signals, and the signal collection and arrangement of the data processing module are facilitated.
In one possible implementation manner, the data processing module includes an acquisition card, where the acquisition card is connected to the photodetector, and the acquisition card is used to acquire an electrical signal output by the photodetector.
Through the technical scheme, after the photoelectric detector processes the collected Stokes light and the collected anti-Stokes light into the electric signals, the acquisition card acquires the processed electric signals, so that the data processing module carries out arrangement calculation on the electric signals.
In one possible implementation, the data processing module further includes a processor, where the processor is connected to the pulse laser and the acquisition card, and the processor is configured to send a control signal to the pulse laser, and process data information acquired by the acquisition card to obtain a temperature of the photovoltaic panel.
Through the technical scheme, the processor is used as a data processing terminal, is connected with the pulse laser and the acquisition card, sends out control signals to the pulse laser, also processes data information acquired by the acquisition card, and obtains the temperature of the detection optical fiber by calculating the information of the acquisition card so as to obtain the temperature information of the photovoltaic panel.
Drawings
The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application, and, as will be apparent to those skilled in the art, are directed to some embodiments of the application and, together with the description, serve to obtain further drawings from which the person skilled in the pertinent art will be able to make and use the application without the aid of inventive faculty.
FIG. 1 is a schematic diagram of the whole structure of a calibration device of a photovoltaic panel temperature measurement system according to an embodiment of the present application;
FIG. 2 is a schematic diagram of the scaling module of FIG. 1;
FIG. 3 is a graph comparing the demodulation effects of the calibration at 50.0deg.C with the calibration performed by the calibration device of the photovoltaic panel temperature measurement system provided by the embodiment of the application;
FIG. 4 is a graph comparing the demodulation effects of the calibration at 60.0deg.C with the calibration performed by the calibration device of the photovoltaic panel temperature measurement system provided by the embodiment of the application;
FIG. 5 is a graph comparing the demodulation effects of the calibration at 70.0deg.C with the calibration performed by the calibration device of the photovoltaic panel temperature measurement system provided by the embodiment of the application.
Reference numerals illustrate:
100-detecting optical fibers;
200-scaling module; 210-a calibration fiber; 220-a temperature sensor; 230-a housing box;
300-a signal transmission module; 310-pulse laser; 320-wavelength division multiplexer; 330-a photodetector;
400-a data processing module; 410-acquisition card; 420-processor.
Specific embodiments of the present application have been shown by way of the above drawings and will be described in more detail below. The drawings and the written description are not intended to limit the scope of the inventive concepts in any way, but rather to illustrate the inventive concepts to those skilled in the art by reference to the specific embodiments.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
Further, it should be noted that, in the description of the present application, terms such as "inner", "outer", and the like, refer to directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or component must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
Furthermore, it should be noted that, in the description of the present application, unless explicitly specified and limited otherwise, the terms "connected," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be the communication between the two components. The specific meaning of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.
The photovoltaic panel is one of the indispensable power generation devices in the solar photovoltaic power generation system, and almost all the photovoltaic panel is composed of thin solid photovoltaic cells made of semiconductor materials. With the rise of new energy industry, the solar photovoltaic power generation industry is rapidly developed. The laying area of the photovoltaic panel is enlarged, the construction site is gradually complicated, and more fire safety hazards exist. Thus, photovoltaic panel temperature detection is one of the indispensable photovoltaic panel maintenance steps.
The existing photovoltaic panel temperature detection comprises an infrared imaging technology, a photoelectric sensor and the like, however, the existing photovoltaic panel temperature detection technology still has a detection blind area in the detection process, and has the problems of large temperature measurement range, low detection efficiency and the like. Therefore, distributed sensing technology for realizing detection by paving the optical fibers on the photovoltaic panel is gradually emerging.
The existing distributed sensing technology mainly realizes temperature sensing according to a two-way demodulation scheme, namely a section of reference optical fiber is preset to be placed in a known temperature, other conditions are unchanged, the reference optical fiber is placed in an environment to be measured, temperature signals carried under different conditions of the optical fiber are respectively collected through a system, and the temperature signals and the known temperature data are substituted into a demodulation formula to be calculated, so that sensing of the environment to be measured is realized. This process is also called scaling. Scaling can reduce to some extent the systematic errors in demodulation due to differences in scattering coefficient and responsivity, etc.
However, in the existing distributed sensing technology, when any component is replaced, the calibration is needed again, and the temperature measurement efficiency is affected.
The application provides a calibration device of a photovoltaic panel temperature measurement system, which is used for solving the problem that any element needs to be recalibrated when being replaced in the existing distributed sensing technology so as to ensure temperature measurement efficiency.
The application will now be described in detail with reference to the accompanying drawings and examples:
FIG. 1 is a schematic diagram of the whole structure of a calibration device of a photovoltaic panel temperature measurement system according to an embodiment of the present application; FIG. 2 is a schematic diagram of the scaling module of FIG. 1; FIG. 3 is a graph comparing the demodulation effects of the calibration at 50.0deg.C with the calibration performed by the calibration device of the photovoltaic panel temperature measurement system provided by the embodiment of the application; FIG. 4 is a graph comparing the demodulation effects of the calibration at 60.0deg.C with the calibration performed by the calibration device of the photovoltaic panel temperature measurement system provided by the embodiment of the application; FIG. 5 is a graph comparing the demodulation effects of the calibration at 70.0deg.C with the calibration performed by the calibration device of the photovoltaic panel temperature measurement system provided by the embodiment of the application.
Referring to fig. 1 to 2, the calibration device of the photovoltaic panel temperature measurement system provided by the embodiment of the application adopts the following technical scheme:
The application provides a calibration device of a photovoltaic panel temperature measurement system, which comprises a detection optical fiber 100, a calibration module 200, a signal transmission module 300 and a data processing module 400.
Wherein the detection fiber 100 is used for being laid on a photovoltaic panel to be detected.
The calibration module 200 comprises a sealed cavity, a calibration optical fiber 210 and at least one temperature sensor 220, wherein the calibration optical fiber 210 and the temperature sensor 220 are both arranged in the sealed cavity, one end of the calibration optical fiber 210 is connected with the detection optical fiber 100, the temperature sensor 220 is used for monitoring the temperature in the sealed cavity where the calibration optical fiber 210 is positioned, and the temperature in the sealed cavity is a preset temperature.
The signal transmission module 300 is connected to the calibration optical fiber 210 and is used for transmitting optical pulses to the calibration module 200 and the detection optical fiber 100, the optical pulses form first light and second light carrying temperature information at the detection optical fiber 100 and the calibration module 200, and the signal transmission module 300 is further used for processing optical signals carried by the first light and the second light into electrical signals.
The data processing module 400 is connected to the signal transmission module 300, and is configured to receive the electrical signal processed by the signal transmission module 300, obtain a preset temperature value through the temperature sensor 220, and calculate to obtain the temperature of the photovoltaic panel.
The preset temperature in the sealed cavity is any reference temperature such as room temperature.
In this way, when the temperature of the photovoltaic panel needs to be detected, the data processing module 400 sends a control signal to the signal transmission module 300, the signal transmission module 300 transmits an optical pulse to the calibration module 200 and the detection optical fiber 100, then the detection optical fiber 100 and the calibration optical fiber 210 generate raman scattering under the interaction of optical fiber molecules, and generate first light and second light with temperature information, the signal transmission module 300 collects and processes the first light signal and the second light signal generated by the detection optical fiber and the calibration optical fiber 210 into electrical signals, the data processing module 400 receives the electrical signals processed by the signal transmission module 300, the temperature sensor 220 obtains a specific value of a preset temperature in the sealed cavity, detects a temperature signal of the calibration optical fiber 210 at the preset temperature, and calculates the temperature signal as reference data to obtain the temperature of the detection optical fiber 100, namely the temperature information of the photovoltaic panel through the data processing module 400; by setting the calibration module 200 as reference data, the temperature signal detection error caused by environmental condition change when the optical fiber is replaced in the environment to be measured after the data is recorded in the known temperature environment is avoided, so that the accuracy of the detected data is still ensured when any component in the photovoltaic panel temperature measurement system is replaced, and the temperature measurement efficiency is improved.
Wherein the first light is Stokes light and the second light is anti-Stokes light.
In the above description, the processor 420 needs to carry out a temperature demodulation formula to obtain the demodulation temperature data when performing calculation processing on the information of the acquisition card 410, where the temperature demodulation formula is formula 1 as follows.
Equation 1
In the above formula 1, T represents the temperature obtained by demodulating the detection fiber, T 0 represents the actual known temperature of the calibration fiber, h= 6.626 × -34 j·s is the planck constant,=13.2 THz is the raman shift, k=1.38x -23 J/K is the boltzmann constant, P as(T)/Ps (T) represents the light intensity ratio of stokes light and anti-stokes light at the temperature T to be measured of the detection fiber, and P as(T0)/Ps(T0) represents the light intensity ratio of stokes light and anti-stokes light at the temperature T 0 to be measured of the calibration fiber.
In the above formula 1, T 0 is the temperature of the calibration fiber 210 in the present application, and the calculation formula is formula 2, as follows.
Equation 2
In the above formula 2, T 1、T2 and T 3 represent temperature values detected by the three temperature sensors 220, respectively.
Specifically, the temperature demodulation formula is mainly based on the two-way demodulation principle of Stokes light and anti-Stokes light ratio, and a section of sensing optical fiber is firstly set as a reference optical fiber. When the sensing fiber is at the reference temperature T 0, stokes light and anti-stokes light fluxes are detected and the ratio is calculated, and the formula is the following formula 3.
Equation 3
And then the sensing optical fiber is positioned in the temperature T to be detected, the Stokes light flux and the anti-Stokes light flux are detected, and the ratio is calculated, wherein the formula is shown as the following formula 4.
Equation 4
In the above formulas 3 and 4, P s and P as are the luminous fluxes of stokes light and anti-stokes light, respectively, K s and K as are the scattering cross-section correlation coefficients of stokes light and anti-stokes light, respectively, S is the back scattering coefficient of the optical fiber, v s and v as are the frequencies of stokes light and anti-stokes light, respectively, and P 0 is the pulse light incident luminous flux; a s and a as are respectively the attenuation coefficients of Stokes light and anti-Stokes light, and l is the length of a measuring point on the optical fiber from the head end of the optical fiber; r s (T) and R as (T) are backscattering factors of Stokes light and anti-Stokes light respectively, and are related to the particle distribution numbers of the high energy level and the low energy level of the optical fiber molecules.
And (3) dividing the formula 3 and the formula 4 for simplification to obtain the formula 1, thereby calculating the temperature T of the optical fiber to be measured.
It should be noted that, the two ends of the calibration optical fiber 210 are respectively a front end and a rear end, the front end is connected to the wavelength division multiplexer 320, and the rear end is connected to one end of the detection optical fiber 100 through a flange.
In some examples, the temperature sensor 220 is DS18B20, and has the characteristics of small volume, low hardware cost, strong anti-interference capability, and high precision.
Specifically, the calibration module 200 further includes a closed accommodating box 230, and the sealing cavity is formed in the accommodating box 230. In some examples, the dimensions of the containment box 230 are 10 x 1.5 cm. The material of the housing case 230 is metal.
It can be appreciated that the calibration optical fiber 210 and the temperature sensor 220 are disposed in the closed accommodating box 230, so as to ensure the constant environment where the calibration optical fiber 210 is located, avoid the influence of external factors of the accommodating box 230 on the accuracy of the detection data of the temperature sensor 220, and ensure the detection efficiency of the calibration optical fiber 210.
Further, a fixing pile is provided in the accommodating case 230, and the calibration optical fiber 210 is wound around the fixing pile.
In some embodiments, as shown in fig. 2, at least one fixing pile is provided, a plurality of fixing piles are located on the same circumference and are uniformly spaced, and the calibration optical fiber 210 is wound around the fixing piles with the center of the plurality of fixing piles as an axis. The calibration fiber 210 is wound around the fixing piles until it is wound into a fiber tray, and the number of the fixing piles is not limited.
Illustratively, the length of the calibration fiber 210 is 200m, and winding on a stake would coil into a fiber optic disc of 85mm diameter.
In a specific implementation, by winding the calibration optical fiber 210 around the fixing piles, the uniformity of the arrangement of the calibration optical fiber 210 in the accommodating box 230 is improved, and the stability of the calibration optical fiber 210 carrying the temperature signal in the accommodating box 230 is ensured.
The number of the temperature sensors 220 is at least two, and each temperature sensor 220 is uniformly spaced around the axial direction of the fixing pile. In some examples, as shown in fig. 2, the number of temperature sensors 220 is three, and the angle between two adjacent temperature sensors 220 is 120 degrees.
In this way, by uniformly arranging the temperature sensors 220 around the fixing piles, the temperature sensors 220 perform circumferential detection on the calibration optical fibers 210 wound on the fixing piles, and then the data processing module 400 averages the data detected by the plurality of temperature sensors 220, thereby improving the accuracy of the detected data.
Further, at least one of the detection fiber 100 and the calibration fiber 210 is a sensing fiber.
In some examples, the sensing fiber is a 62.5/125 μm graded-index multimode sensing fiber having a core diameter of 62.5 μm and a cladding diameter of 125 μm.
It can be appreciated that the sensing optical fiber has the characteristics of sensitivity, electromagnetic interference resistance, and the like, and by setting at least one of the detecting optical fiber 100 and the calibration optical fiber 210 as the sensing optical fiber, the stability of system detection is improved, and the accuracy of detection data is further ensured.
In some embodiments, the signal delivery module 300 includes a pulsed laser 310, the pulsed laser 310 connecting the data processing module 400 and the scaling module 200, the pulsed laser 310 configured to receive the control signal from the data processing module 400 and deliver the light pulses to the detection fiber 100 and the scaling module 200.
Wherein the detection fiber 100 and the scaling module 200 will generate stokes light and anti-stokes light upon receiving the light pulse.
In some examples, pulsed laser 310 has a center wavelength of 1550 nm and a repetition rate of 60 kHz.
Thus, in practical application, when the temperatures of the detecting optical fiber 100 and the calibration optical fiber 210 need to be detected, the data processing module 400 sends a control signal to the pulse laser 310, then the pulse laser 310 generates an optical pulse with a preset frequency, the calibration optical fiber 210 and the detecting optical fiber 100 receive the optical pulse and interact with optical fiber molecules to generate raman scattering, then stokes light and anti-stokes light with temperature information are generated, and the pulse laser 310 is installed to convert an electric signal into an optical signal, so that the signal transmission efficiency is ensured.
Further, the signal transmission module 300 further includes a wavelength division multiplexer 320, where the wavelength division multiplexer 320 connects the pulse laser 310 and the scaling fiber 210, and the wavelength division multiplexer 320 is used to transmit the optical pulse to the detection fiber 100 and the scaling module 200, and collect stokes light and anti-stokes light.
In some examples, wavelength division multiplexer 320 operates at 1450 nm and 1600 nm.
It will be appreciated that when the pulse laser 310 emits an optical pulse, the optical pulse is transmitted to the calibration optical fiber 210 and the detection optical fiber 100 through the wavelength division multiplexer 320, and then the stokes light and anti-stokes light generated by the calibration optical fiber 210 and the detection optical fiber 100 are collected by the wavelength division multiplexer 320, so that the signal transmission module 300 collects an optical signal to process the optical signal.
In the above description, the signal transmission module 300 further includes a photodetector 330, where the photodetector 330 is connected to the wavelength division multiplexer 320 and the data processing module 400, and the photodetector 330 is used for processing stokes light and anti-stokes light collected by the wavelength division multiplexer 320 into electrical signals and transmitting the electrical signals to the data processing module 400.
In some examples, the wavelength detection range of photodetector 330 is 1000-1700 nm.
After the stokes light and the anti-stokes light are collected to the wavelength division multiplexer 320, the photodetector 330 processes the collected stokes light and anti-stokes light into electrical signals, and finally, data information is transmitted to the data processing module 400, so that the signal transmission module 300 processes the optical signals, and the signal collection and arrangement of the data processing module 400 are facilitated.
It should be noted that, the data processing module 400 includes an acquisition card 410, the acquisition card 410 is connected to the photodetector 330, and the acquisition card 410 is used for acquiring an electrical signal output by the photodetector 330.
In some examples, the acquisition card 410 samples 12 bits in number, with a sampling frequency of 200 MHz, and a channel number of 2.
Thus, after the photodetector 330 processes the collected stokes light and anti-stokes light into electrical signals, the collection card 410 collects the processed electrical signals, so that the data processing module 400 performs the sorting calculation on the electrical signals.
Further, the data processing module 400 further includes a processor 420, where the processor 420 is connected to the pulse laser 310 and the acquisition card 410, and the processor 420 is configured to send a control signal to the pulse laser 310 and process the data information acquired by the acquisition card 410 to obtain the temperature of the photovoltaic panel.
It can be understood that the processor 420 is used as a data processing terminal, and is connected with the pulse laser 310 and the acquisition card 410, and sends out a control signal to the pulse laser 310, and also processes the data information acquired by the acquisition card 410, and the temperature of the detection optical fiber 100 is obtained by calculating the information of the acquisition card 410, so as to obtain the temperature information of the photovoltaic panel.
Specifically, the processor 420 needs to carry out calculation processing on the information of the acquisition card 410 to obtain demodulation temperature data by carrying out the temperature formula 1.
In some examples, processor 420 is a host computer. By setting an alarm temperature threshold in the processor 420, the alarm module is activated when the demodulated temperature data is greater than the threshold; when the demodulation temperature data is smaller than the threshold value, the temperature value of the photovoltaic panel is recorded in real time, and the demodulation data is substituted into a calculation formula of the photovoltaic panel power generation power to predict the system power.
In the above description, the calculation formula of the photovoltaic panel generation power is formula 5, as follows.
Equation 5
In the above formula 5, E represents the output power of the photovoltaic panel, Q represents the intensity of solar radiation,Indicating the transmittance of the glass cover plate,/>The power generation efficiency of the photovoltaic panel is represented by k, the temperature coefficient of the photovoltaic panel is represented by k, and the measured temperature of the photovoltaic panel is represented by T.
According to the calibration device of the photovoltaic panel temperature measurement system, the detection optical fiber 100 is paved on the photovoltaic panel, and then the detection optical fiber 100, the calibration module 200, the signal transmission module 300 and the data processing module 400 are connected. When the temperature of the photovoltaic panel needs to be detected, the processor 420 sends a control signal to the pulse laser 310, then the pulse laser 310 generates light pulses with preset frequency, the light pulses are transmitted to the calibration optical fiber 210 and the detection optical fiber 100 through the wavelength division multiplexer 320, the calibration optical fiber 210 and the detection optical fiber 100 receive the light pulses and interact with optical fiber molecules to generate raman scattering, and then stokes light and anti-stokes light with temperature information are generated respectively; wavelength division multiplexer 320 collects stokes light and anti-stokes light generated by calibration optical fiber 210 and detection optical fiber 100 and transmits the collected stokes light and anti-stokes light to photodetector 330, and photodetector 330 processes the collected stokes light and anti-stokes light into an electrical signal; the collection card 410 collects the processed electrical signals, the temperature sensor 220 obtains a specific value of the preset temperature in the sealed cavity, meanwhile, the collection card 410 collects the temperature signal of the calibration optical fiber 210 at the preset temperature, the processor 420 processes the information of the collection card 410, and the temperature value of the detection optical fiber 100 can be calculated by bringing the data into the formula 1 and the formula 2.
The processor 420 then compares the resulting data with a set alarm temperature threshold, if greater than the threshold, activates an alarm module, if less than the threshold, records the temperature value and brings it into equation 5 to calculate the photovoltaic panel generated power at that temperature.
And repeating the operation to obtain the demodulation temperature and the power of the photovoltaic panel at different temperatures.
The calibration optical fiber 210 is used as a reference optical fiber to obtain a temperature signal at a known temperature, and the temperature signal is used as reference data to obtain temperature information of the photovoltaic panel at the detection optical fiber 100 through calculation of the data processing module 400; by setting the calibration module 200 as reference data, the temperature signal detection error caused by environmental condition change when the optical fiber is replaced in the environment to be measured after the data is recorded in the known temperature environment is avoided, so that the accuracy of the detected data is still ensured when any component in the photovoltaic panel temperature measurement system is replaced, and the temperature measurement efficiency is improved.
To verify the effectiveness of the novel calibration scheme of the present application, the system is subjected to temperature measurement demodulation in a conventional typical calibration scheme and the novel calibration scheme of the present application respectively with reference to the accompanying drawings, and the demodulation result is analyzed by introducing root mean square error.
The traditional typical calibration scheme is to respectively take sensing optical fibers on a photovoltaic panel as reference optical fibers and optical fibers to be tested, respectively collect Stokes light and anti-Stokes light of the photovoltaic panel at different temperatures by using a system, and obtain a temperature result according to a temperature demodulation formula; the novel calibration scheme of the application is consistent with the traditional calibration scheme, but the reference optical fiber is formed by arranging the calibration module 200, arranging the calibration optical fiber 210 in the calibration module 200, taking the temperature measurement average value of the temperature sensor in the calibration module 200 as the reference temperature, respectively acquiring Stokes light and anti-Stokes light of the optical fiber to be tested and the calibration optical fiber 210 at different temperatures by using a system, and obtaining a temperature result according to a temperature demodulation formula.
Referring to fig. 3, fig. 4 and fig. 5, there are respectively a comparison graph of the demodulation effects of the existing calibration at 50 ℃, 60 ℃ and 70 ℃ and the calibration performed by the calibration device of the photovoltaic panel temperature measurement system provided by the embodiment of the application. The two lines in the figure respectively represent the temperature measurement results of the existing calibration (i.e. "typical calibration" in the figure) and the calibration (i.e. "novel calibration" in the figure) performed by the calibration device of the photovoltaic panel temperature measurement system provided by the embodiment of the application.
The approximate variation of the thermometry data in the two calibration schemes under different circumstances can be found by figures 3 to 5. Obviously, compared with the existing calibration, the calibration device of the photovoltaic panel temperature measurement system provided by the embodiment of the application is adopted to calibrate the temperature measurement data closer to the ambient temperature. Meanwhile, the effectiveness of the scaling of the application is clear by combining the mean square error calculation result in the following table.
The demodulation results of the two different scaling schemes are analyzed according to the root mean square error, and the root mean square error calculation formula is formula 6, as follows.
Equation 6
In the above formula 6, T d,i represents the temperature to be measured, T represents the reference temperature, and N is the data.
The following table shows the root mean square error for the two calibration schemes at different reference temperatures.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosed technology.
This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains.
It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. The utility model provides a calibration device of photovoltaic board temperature measurement system which characterized in that includes:
The detection optical fiber is used for being paved on a photovoltaic panel to be detected;
The calibration module comprises a sealing cavity, a calibration optical fiber and at least one temperature sensor, wherein the calibration optical fiber and the temperature sensor are arranged in the sealing cavity, one end of the calibration optical fiber is connected with the detection optical fiber, the temperature sensor is used for monitoring the temperature in the sealing cavity where the calibration optical fiber is positioned, and the temperature in the sealing cavity is a preset temperature;
The signal transmission module is connected with the calibration optical fiber and used for transmitting light pulses to the calibration module and the detection optical fiber, the light pulses form first light and second light carrying temperature information at the positions of the detection optical fiber and the calibration module, and the signal transmission module is also used for processing optical signals carried by the first light and the second light into electric signals;
The data processing module is connected with the signal conveying module and is used for receiving the electric signals processed by the signal conveying module, obtaining a preset temperature value through a temperature sensor and calculating to obtain the temperature of the photovoltaic panel.
2. The scaling device of a photovoltaic panel temperature measurement system of claim 1, wherein the scaling module further comprises a closed containment box, the sealed cavity being open in the containment box.
3. The device for calibrating a temperature measurement system of a photovoltaic panel according to claim 2, wherein a fixing pile is arranged in the accommodating box, and the calibration optical fiber is wound on the fixing pile.
4. A calibration device for a photovoltaic panel temperature measurement system according to claim 3, wherein the number of temperature sensors is at least two, and each temperature sensor is uniformly spaced around the axial direction of the fixing pile.
5. The calibration device of a photovoltaic panel temperature measurement system according to claim 1, wherein at least one of the detection fiber and the calibration fiber is a sensing fiber.
6. The calibration device of the photovoltaic panel temperature measurement system according to claim 1, wherein the signal transmission module comprises a pulse laser, the pulse laser is connected with the data processing module and the calibration module, and the pulse laser is used for receiving a control signal sent by the data processing module and transmitting the light pulse to the detection optical fiber and the calibration module;
The detection optical fiber and the scaling module generate the first light and the second light after receiving the light pulse;
the first light is stokes light and the second light is anti-stokes light.
7. The calibration device of the photovoltaic panel temperature measurement system according to claim 6, wherein the signal transmission module further comprises a wavelength division multiplexer connecting the pulse laser and the calibration fiber, the wavelength division multiplexer being configured to transmit optical pulses to the detection fiber and the calibration module and collect the stokes light and the anti-stokes light.
8. The calibration device of the photovoltaic panel temperature measurement system according to claim 7, wherein the signal transmission module further comprises a photodetector, the photodetector is connected to the wavelength division multiplexer and the data processing module, and the photodetector is used for processing the stokes light and the anti-stokes light collected by the wavelength division multiplexer into electrical signals and transmitting the electrical signals to the data processing module.
9. The calibration device of a photovoltaic panel temperature measurement system according to any one of claims 1 to 8, wherein the data processing module comprises an acquisition card, the acquisition card being connected to the photodetector, the acquisition card being configured to acquire an electrical signal output by the photodetector.
10. The calibration device of the photovoltaic panel temperature measurement system according to claim 9, wherein the data processing module further comprises a processor, the processor is connected with the pulse laser and the acquisition card, and the processor is used for sending a control signal to the pulse laser and processing data information acquired by the acquisition card to obtain the temperature of the photovoltaic panel.
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