Solar cell calibration-oriented high-altitude balloon sphere reflected light detection method and device

Abstract

The invention provides a solar cell calibration-oriented high-altitude balloon sphere reflected light detection method, and relates to the technical field of solar cell calibration, the method is based on high-altitude balloon attribute parameters, a three-order Bezier curve is used for fitting a two-dimensional model of a high-altitude balloon, and thus an accurate sphere geometric model is established; determining the solar altitude based on the latitude of the position of the high-altitude balloon and the sun irradiation time, thereby determining the angle of the sunlight irradiating the high-altitude balloon; and then, based on the two-dimensional model and the solar altitude angle, determining a quantized value of the reflected light of the high-altitude balloon which generates interference on solar cell calibration. According to the solar cell calibration-oriented high-altitude balloon sphere reflected light detection method provided by the invention, through quantitative evaluation of the high-altitude balloon sphere reflected light, accurate detection of the high-altitude balloon sphere reflected light is realized, and the solar cell calibration precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cell calibration, and particularly to a method and device for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration. Background Art

[0002] The high-altitude balloon solar cell calibration method is one of the common methods for in-situ calibration of space solar cells at high altitudes. A solar cell calibration device is carried by a high-altitude balloon and flown to an altitude of 35 km or above to calibrate the solar cell. When the high-altitude balloon reaches the flight altitude, the battery under test is measured through the tracking system of the solar calibration device at a vertical solar light incident angle.

[0003] Although the solar spectrum and intensity in the near space are already relatively close to the space AM0 spectrum and space light intensity, the sunlight reflected by the high-altitude balloon sphere will seriously interfere with the calibration data, thus affecting the calibration accuracy. At present, there is no systematic method to accurately detect the interference amount caused by the sphere-reflected light, nor can the influence of the sphere-reflected light on the calibration accuracy of solar cells be avoided. Summary of the Invention

[0004] The present invention provides a method and device for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration, so as to solve the technical problem in the prior art that the interference amount caused by the reflected light of the high-altitude balloon sphere cannot be accurately detected, resulting in low calibration accuracy of solar cells.

[0005] The present invention provides a method for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration, including the following steps: Obtain the high-altitude balloon attribute parameters, the latitude of the location where the high-altitude balloon is located, and the solar irradiation time; the high-altitude balloon attribute parameters include the geometric dimensions, shape, and material parameters of the high-altitude balloon; Based on the high-altitude balloon attribute parameters, use a third-order Bezier curve to fit the two-dimensional model of the high-altitude balloon; Based on the latitude of the location where the high-altitude balloon is located and the solar irradiation time, determine the solar altitude angle; Based on the two-dimensional model and the solar altitude angle, determine the quantization value of the reflected light of the high-altitude balloon sphere that interferes with the solar cell calibration.

[0006] According to the method for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration provided by the present invention, the step of determining the quantization value of the reflected light of the high-altitude balloon sphere that interferes with the solar cell calibration based on the two-dimensional model and the solar altitude angle includes: Based on the two-dimensional model and the solar altitude angle, determine the reflection angle and reflectivity of the reflected light of the sunlight irradiating the high-altitude balloon; Based on the reflection angle and the reflectivity, calculate the change in the short - circuit current in the solar cell caused by the reflected light; Use the change in the short - circuit current as the quantization value of the reflected light from the high - altitude balloon sphere that interferes with the calibration of the solar cell.

[0007] According to a method for detecting the reflected light of a high - altitude balloon sphere for solar cell calibration provided by the present invention, the calculating, based on the reflection angle and the reflectivity, the change in the short - circuit current in the solar cell caused by the reflected light includes: Based on the reflection angle and the reflectivity, determine the path of the reflected light; Based on the path of the reflected light, determine the light intensity of the reflected light irradiating the solar cell calibration device; Based on the light intensity, calculate the change in the short - circuit current in the solar cell caused by the reflected light.

[0008] According to a method for detecting the reflected light of a high - altitude balloon sphere for solar cell calibration provided by the present invention, the calculation expression of the change in the short - circuit current in the solar cell caused by the reflected light is as follows: Wherein, represents the change in the short - circuit current in the solar cell caused by the reflected light, represents the reflectivity of the reflected light of the sunlight irradiating the high - altitude balloon, represents the control point coordinates of the curve in the y - axis direction in the two - dimensional model, represents the control point coordinates of the curve in the x - axis direction in the two - dimensional model, represents a parameter with a value range of [0, 1] for parameterizing the points on the curve in the two - dimensional model, represents the parameter corresponding to the irradiation point of the sun's rays on the high - altitude balloon, represents the latitude of the location where the high - altitude balloon is located, represents the declination angle, represents the angle between the meridian plane of the location where the solar cell calibration device is located and the solar meridian plane.

[0009] According to a method for detecting the reflected light of a high - altitude balloon sphere for solar cell calibration provided by the present invention, the path of the reflected light is also used to determine the irradiation area of the reflected light of the high - altitude balloon sphere; The irradiation area is used to determine the shading angle of the reflected light of the high - altitude balloon sphere; The shading angle is used to block the reflected light of the high - altitude balloon sphere.

[0010] A method for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration provided by the present invention, after determining the quantization value of the reflected light of the high-altitude balloon sphere that interferes with the solar cell calibration based on the two-dimensional model and the solar altitude angle, further includes: Performing simulation calculations on the quantization value to determine the influencing factors of the intensity of the reflected light of the high-altitude balloon sphere.

[0011] The present invention also provides a device for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration, including the following modules: An acquisition module for acquiring high-altitude balloon attribute parameters, the latitude of the location where the high-altitude balloon is located, and the solar irradiation time; the high-altitude balloon attribute parameters include the geometric dimensions, shape, and material parameters of the high-altitude balloon; A generation module for fitting a two-dimensional model of the high-altitude balloon using a third-order Bezier curve based on the high-altitude balloon attribute parameters; A determination module for determining the solar altitude angle based on the latitude of the location where the high-altitude balloon is located and the solar irradiation time; A detection module for determining the quantization value of the reflected light of the high-altitude balloon sphere that interferes with the solar cell calibration based on the two-dimensional model and the solar altitude angle.

[0012] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and running on the processor, where when the processor executes the computer program, it implements the method for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration as described in any one of the above.

[0013] The present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the method for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration as described in any one of the above.

[0014] The present invention also provides a computer program product, including a computer program, and when the computer program is executed by a processor, it implements the method for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration as described in any one of the above.

[0015] A method for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration provided by the present invention, based on the attribute parameters of the high-altitude balloon, uses a third-order Bezier curve to fit the two-dimensional model of the high-altitude balloon, thereby establishing an accurate spherical geometric model; based on the latitude of the location of the high-altitude balloon and the solar irradiation time, the solar altitude angle is determined, thereby determining the angle of sunlight irradiating the high-altitude balloon; then based on the two-dimensional model and the solar altitude angle, the quantization value of the reflected light of the high-altitude balloon sphere that interferes with the solar cell calibration is determined, so as to realize the accurate detection of the reflected light of the high-altitude balloon sphere through accurate and specific quantitative evaluation, and further improve the accuracy of solar cell calibration. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic flowchart of a method for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration provided by the present invention.

[0018] Figure 2 It is a schematic structural diagram of a solar cell calibration flight system provided by the present invention.

[0019] Figure 3 It is a schematic diagram of sphere modeling provided by the present invention.

[0020] Figure 4 It is a schematic diagram of an analysis model for the reflected light of a high-altitude balloon sphere provided by the present invention.

[0021] Figure 5 It is a schematic diagram of the curve of the change of the reflected light intensity with time simulated by a sphere reflection simulation calculation software provided by the present invention.

[0022] Figure 6 It is a schematic flowchart of error simulation analysis and calculation through software provided by the present invention.

[0023] Figure 7 It is a schematic diagram of the operation of a sphere reflection analysis software provided by the present invention.

[0024] Figure 8 It is a schematic diagram of light shielding protection provided by the present invention.

[0025] Figure 9 It is a schematic structural diagram of a device for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration provided by the present invention.

[0026] Figure 10 It is a schematic structural diagram of the electronic device provided by the present invention. Specific embodiments

[0027] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] During the calibration process of a solar cell, the irradiation of any other light source except the sunlight will change the normal calibration data. Although most high-altitude balloons are made of rubber materials with low reflectivity for the sphere, the high-altitude balloon flying in the near space will, under the action of the internal air pressure, make the sphere made of rubber form a relatively smooth curved surface under the action of the surface tension. This smooth surface will cause the incident light to produce strong specular reflection at a specific angle, rather than the usual diffuse reflection. The specular reflection will cause the light to be directly reflected onto the solar cell to be calibrated, increasing the received sunlight by a part, thereby affecting the calibration accuracy.

[0029] Since high-altitude balloons will experience different illumination angles at different flight altitudes and latitudes and longitudes, at a specific time and location, the light reflected by the sphere will definitely irradiate the solar cell to be calibrated, thus interfering with the calibration.

[0030] When existing optical modeling methods (such as Monte Carlo ray tracing or finite element analysis) simulate the multi-path propagation of the light reflected by the sphere, limited by the calculation accuracy and the uncertainty of environmental parameters, they cannot fully and accurately predict the intensity and distribution of the reflected light, and lack a systematic correction method, resulting in the measured value of the short-circuit current of the solar cell caused by the sphere reflection light being often higher than the theoretical value, making it impossible to clarify the interference amount of the sphere reflected light. At the same time, the analysis of the reflected light lacks an in-depth theoretical model, restricting the understanding of its influence mechanism, resulting in the existing research relying on specific experimental parameters and lacking universality.

[0031] In addition, most of the existing technologies are designed for general optical interference problems and do not fully consider the unique reflection characteristics of high-altitude balloons (such as the sphere geometry and the light behavior under the conditions of the thin atmosphere in the near space), resulting in limited detection effects of the sphere reflected light by the existing technologies in a specific environment (such as the dynamic reflection during the flight of a high-altitude balloon). Therefore, it is impossible to design a comprehensive protection and optimization scheme for the sphere reflected light.

[0032] Aiming at the problem that the reflection of the high-altitude balloon sphere causes errors in the calibration data of solar cells, the present invention proposes a method for detecting the reflected light of the high-altitude balloon sphere for solar cell calibration, using a third-order Bezier curve to fit the sphere shape, establishing an accurate reflective analysis model, and through simulation calculation and experimental verification, quantitatively evaluating the influence of the sphere reflection on the short-circuit current of the solar cell. At the same time, in order to reduce the reflection interference, the present invention also proposes strategies such as designing a light-shielding cover and optimizing the flight time, location, and cable length for the sphere reflection.

[0033] The following combines Figures 1 to 10 to describe a method and device for detecting the reflected light of the high-altitude balloon sphere for solar cell calibration according to the present invention.

[0034] Figure 1 is a schematic flow chart of a method for detecting the reflected light of the high-altitude balloon sphere for solar cell calibration provided by the present invention. As Figure 1 shown, the method includes step 101, step 102, step 103, and step 104: Step 101: Obtain the high-altitude balloon attribute parameters, the latitude of the location where the high-altitude balloon is located, and the solar irradiation time; the high-altitude balloon attribute parameters include the geometric dimensions, shape, and material parameters of the high-altitude balloon.

[0035] Specifically, Figure 2 is a schematic structural diagram of a solar cell calibration flight system provided by the present invention. As Figure 2 shown, the solar cell calibration flight system includes a high-altitude balloon, a cutter, a parachute, a solar cell calibration device, a pod (for power supply, communication, and flight control), a measurement and control antenna, and a buffer device. The solar cell calibration device is located between the high-altitude balloon sphere and the pod, that is, below the high-altitude balloon sphere and above the pod. When the high-altitude balloon reaches the flight altitude, the battery to be tested can be made to be perpendicular to the solar incident angle through the tracking system of the solar calibration device for measurement.

[0036] In order to perform simulation analysis and calculation on the reflected light of the high-altitude balloon sphere during the solar cell calibration process, it is necessary to first obtain the high-altitude balloon attribute parameters, the latitude of the location where the high-altitude balloon is located, and the solar irradiation time. Among them, the high-altitude balloon attribute parameters include the geometric dimensions of the high-altitude balloon (such as the lateral width and longitudinal height, etc.), the shape, and the material parameters.

[0037] Step 102: Based on the high-altitude balloon attribute parameters, use a third-order Bezier curve to fit the two-dimensional model of the high-altitude balloon.

[0038] Specifically, aiming at the problem that the reflection of the high-altitude balloon sphere causes errors in the calibration data of solar cells, the embodiment of the present invention uses a third-order Bezier curve to fit the sphere shape of the high-altitude balloon and establish an accurate reflective analysis model.

[0039] For precise analysis of the geometric relationship of the sphere reflection, in the embodiments of the present invention, a high-altitude balloon sphere in the shape of a water droplet during the level flight phase is taken as an example for simulation. Based on the data measured on site, the shape of the sphere is fitted with a third-order Bezier curve, and a corresponding mathematical model is established. The relevant parametric equations are as follows: In the formula, represents the coordinate change of the curve in the horizontal direction (x-axis) in the two-dimensional model, represents the coordinate change of the curve in the vertical direction (y-axis) in the two-dimensional model, and are used to jointly define the curve in the two-dimensional model corresponding to the high-altitude balloon, represents a parameter with a value range of [0, 1], which is used to parameterize the points on the curve in the two-dimensional model. When t changes from 0 to 1, it means that the curve in the two-dimensional model smoothly transitions from the starting point (t = 0) to the ending point (t = 1), represents the coordinate of the control point of the curve in the x direction in the two-dimensional model, represents the coordinate of the control point of the curve in the y direction in the two-dimensional model. In the embodiments of the present invention, = 74.5m, = 46m, and at this time, the maximum horizontal width of the curve is 43m, and the maximum vertical height is 34.5m.

[0040] Figure 3 is a schematic diagram of sphere modeling provided by the present invention, as Figure 3 shown. Figure 3 In (a) of, taking the high-altitude balloon with specific geometric dimensions of a maximum horizontal width of 43m and a maximum vertical height of 34.5m during the level flight phase as an example, the shape of the high-altitude balloon is drawn, Figure 3 In (b) of, it is the two-dimensional model (i.e., the Bezier curve fitting graph) of the high-altitude balloon shown in (a) of Figure 3 fitted with a third-order Bezier curve. In addition, in the embodiments of the present invention, a high-altitude balloon made of polyethylene material is taken as an example for illustration. Therefore, the material parameters corresponding to the two-dimensional model of the fitted high-altitude balloon are of polyethylene material.

[0041] Step 103: Determine the solar altitude angle based on the latitude of the location where the high-altitude balloon is located and the solar irradiation time.

[0042] Specifically, the solar altitude angle is the angle between the sun's rays and the horizontal plane. The change of the solar altitude angle is determined by the latitude of the location where the high-altitude balloon is located and the solar irradiation time. The expression for calculating the solar altitude angle is: In the formula, is the latitude of the position where the high-altitude balloon is located. The north latitude is positive, and its value range is ; is the declination angle, which represents the angle between the plane of the direct sunlight on the local meridian and the equatorial plane. The north latitude is positive, and the value range is ; is the solar hour angle, which is the angle between the meridian plane of the position where the solar cell calibration device is located and the solar meridian plane. It is zero at noon and positive in the morning.

[0043] It can be solved according to the following empirical formula: In the formula, is 0.006918, is 0.399912, is 0.070257, is 0.006758, is 0.000907, is 0.002697, is 0.001480, represents the solar angular day, and the expression is as follows: In the formula, is the total number of days in a year, is the number of days in that year. In a common year (i.e., a non-leap year), = 365, ranges from 1 to 365. In a leap year, = 366, ranges from 1 to 366.

[0044] When calculating the solar hour angle, it is necessary to convert the local standard time used by the observer into the local apparent time , because what is directly related to is the position of the sun or the incident angle of solar radiation, rather than : In the formula, is the longitude of the standard meridian of the local time zone (in degrees), is the local longitude, is the equation of time: In the formula, is 0.000075, is 0.001868, is 0.032077, is 0.014615, is 0.040890, which can be positive or negative. Based on this, the solar hour angle is calculated : Figure 4 is a schematic diagram of a high-altitude balloon sphere reflection analysis model provided by the present invention. As Figure 4 shown, the light ray DB in the figure represents the direct irradiation of the sun, and the light ray OB represents the light ray reflected after the sun ray AO passes through the sphere made of polyethylene material (i.e., the material of the high-altitude balloon). The light ray O'C is the vertical component of the reflected light in the direction of the calibration plate. Among them, is the solar altitude angle, is the reflection angle.

[0045] The embodiment of the present invention uses a third-order Bezier curve to fit the sphere shape and establishes an accurate high-altitude balloon sphere reflection analysis model, providing a basis for subsequent simulation analysis and quantitative evaluation of the reflected light of the high-altitude balloon sphere.

[0046] Step 104: Based on the two-dimensional model and the solar altitude angle, determine the quantization value of the reflected light of the high-altitude balloon sphere that interferes with the calibration of the solar cell.

[0047] Specifically, during the level flight stage of the high-altitude balloon, the solar cell calibration device is not only directly irradiated by the sun but also affected by the reflected light of the sphere.

[0048] Optionally, the determining the quantization value of the reflected light of the high-altitude balloon sphere that interferes with the calibration of the solar cell based on the two-dimensional model and the solar altitude angle includes: Based on the two-dimensional model and the solar altitude angle, determine the reflection angle and reflectivity of the reflected light of the sunlight irradiating the high-altitude balloon; Based on the reflection angle and the reflectivity, calculate the change amount of the short-circuit current in the solar cell generated by the reflected light; Use the change amount of the short-circuit current as the quantization value of the reflected light of the high-altitude balloon sphere that interferes with the calibration of the solar cell.

[0049] Specifically, from Figure 4 the schematic diagram of the high-altitude balloon sphere reflection analysis model, it can be seen that based on the two-dimensional model and the solar altitude angle, the reflection angle of the reflected light of the sunlight irradiating the high-altitude balloon can be calculated according to the light path reflection path (such as Figure 4 in ). For the parameters of specific sphere materials (in the embodiments of the present invention, polyethylene material is taken as an example for illustration), the reflectance of sunlight in different spectral bands (such as visible light and infrared light, etc.) can be determined.

[0050] According to Figure 4 , the steps to calculate the reflection angle of the reflected light of sunlight irradiating the high-altitude balloon are as follows: First, take the derivative of Bezier. The calculation expression for taking the derivative of Bezier is as follows: In the formula, represents the coordinate change of the curve in the horizontal direction (x-axis) in the two-dimensional model, represents the coordinate change of the curve in the vertical direction (y-axis) in the two-dimensional model XXX, represents a parameter with a value range of [0, 1], which is used to parameterize the points on the curve in the two-dimensional model. When t changes from 0 to 1, it means that the curve in the two-dimensional model smoothly transitions from the starting point (t = 0) to the ending point (t = 1), = 74.5m, = 46m.

[0051] The reflected light OB can be expressed as: In the formula, represents the coordinate change of the curve in the vertical direction (y-axis) in the two-dimensional model. x and y are used to jointly define the straight line corresponding to the reflected light, represents the solar altitude angle, represents the reflection angle of the reflected light, represents the coordinate change of the curve in the horizontal direction (x-axis) in the two-dimensional model.

[0052] Therefore, only by optimizing and solving the following equation can the parameters corresponding to the irradiation point of the solar ray irradiating the high-altitude balloon at the intersection point be obtained : Subsequently, substitute into the calculation expression for taking the derivative of Bezier, and then subtract the solar altitude angle to obtain the solar incidence angle.

[0053] According to the law of reflection of light, the reflection angle is equal to the incidence angle. Therefore, the reflection angle of the reflected light of sunlight irradiating the high-altitude balloon is numerically equal to the solar incidence angle.

[0054] Optionally, calculating the change in the short - circuit current in the solar cell caused by the reflected light based on the reflection angle and the reflectivity includes: Determining the path of the reflected light based on the reflection angle and the reflectivity; Determining the light intensity of the reflected light irradiating the solar cell calibration device based on the path of the reflected light; Calculating the change in the short - circuit current in the solar cell caused by the reflected light based on the light intensity.

[0055] Specifically, after determining the reflection angle of the reflected light of sunlight irradiating the high - altitude balloon, by combining the parameters of the specific sphere material (in this embodiment of the present invention, polyethylene material is taken as an example) and the reflectivity of sunlight in different spectral bands (such as visible light and infrared light, etc.), the path of the reflected light can be determined through software simulation, so as to dynamically simulate the incident angle of the reflected light and the corresponding light intensity change, and generate a curve of the reflected light intensity (i.e., the light intensity of the reflected light irradiating the solar cell calibration device) changing with time. Figure 5 It is a schematic diagram of the curve of the reflected light intensity changing with time simulated by a sphere reflection simulation calculation software provided by the present invention, as Figure 5 shown.

[0056] According to the light intensity of the reflected light irradiating the solar cell calibration device, the change in the short - circuit current in the solar cell caused by the reflected light can be further calculated.

[0057] Optionally, the calculation expression of the change in the short - circuit current in the solar cell caused by the reflected light is as follows: Wherein, represents the change in the short - circuit current in the solar cell caused by the reflected light, represents the reflectivity of the reflected light of sunlight irradiating the high - altitude balloon, represents the control point coordinate of the curve in the y - axis direction in the two - dimensional model, used to characterize the vertical amplitude of the curve. By adjusting the value, the height change of the curve in the y - axis direction can be changed (in this embodiment of the present invention, = 46m), represents the control point coordinate of the curve in the x - axis direction in the two - dimensional model, used to characterize the horizontal expansion degree of the curve, The larger the absolute value of is, the wider the swing range of the curve in the x - axis direction (in this embodiment of the present invention, represents a parameter with a value range of [0, 1], used to parameterize the points on the curve in the two - dimensional model. When t changes from 0 to 1, it means that the curve in the two - dimensional model smoothly transitions from the starting point (t = 0) to the ending point (t = 1). Parameters corresponding to the irradiation point where solar rays shine on the high-altitude balloon Indicates the latitude of the location where the high-altitude balloon is located Indicates the declination angle Indicates the angle between the meridian plane of the location where the solar cell calibration device is located and the solar meridian plane

[0058] Specifically, after calculating the change amount of the short-circuit current in the solar cell caused by the reflected light through the above calculation expression, the embodiment of the present invention uses the change amount of the short-circuit current as the quantization value of the reflected light of the high-altitude balloon sphere that interferes with the solar cell calibration, and can quantitatively evaluate the calibration error caused by the reflected light of the high-altitude balloon sphere, accurately detect the influence caused by the reflected light of the high-altitude balloon sphere, and thus determine the error value caused by the reflected light of the high-altitude balloon sphere on the calibration accuracy of the solar cell, improving the calibration accuracy of the solar cell in actual measurement

[0059] A method for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration provided by the present invention, based on the attribute parameters of the high-altitude balloon, uses a third-order Bezier curve to fit the two-dimensional model of the high-altitude balloon, thereby establishing an accurate sphere geometric model; based on the latitude of the location where the high-altitude balloon is located and the solar irradiation time, determines the solar altitude angle, thereby determining the angle of sunlight irradiating the high-altitude balloon; then based on the two-dimensional model and the solar altitude angle, determines the quantization value of the reflected light of the high-altitude balloon sphere that interferes with the solar cell calibration, thereby realizing the accurate detection of the reflected light of the high-altitude balloon sphere through accurate and specific quantitative evaluation, and further improving the calibration accuracy of the solar cell

[0060] Optionally, after determining the quantization value of the reflected light of the high-altitude balloon sphere that interferes with the solar cell calibration based on the two-dimensional model and the solar altitude angle, it further includes: Performing a simulation calculation on the quantization value to determine the influencing factors of the intensity of the reflected light of the high-altitude balloon sphere

[0061] Specifically, based on the above embodiment, after determining the calibration error caused by the reflected light of the high-altitude balloon sphere according to the quantization value, the error can also be simulated and analyzed to determine the influencing factors of the intensity of the reflected light of the high-altitude balloon sphere

[0062] Figure 6 Is a schematic diagram of the error simulation analysis calculation process through software provided by the present invention, as Figure 6 shown, the overall process includes: 1) Calculate the reflected light angle according to the reflection analysis model: Calculate the reflection angle according to the high-altitude balloon sphere reflection analysis model 2) Determine the reflectivity of high-altitude balloons made of different materials to sunlight in different spectral bands (such as visible light and infrared light, etc.); 3) Dynamically simulate the curve of the intensity of reflected light changing with time through software; 4) Determine the energy distribution of reflected light in different spectral bands; 5) Calculate the influence of reflected light on the short-circuit current; 6) Analyze the increase in short-circuit current: Analyze the increase in different short-circuit currents generated by solar cells under different conditions (such as different materials and different spectral bands); 7) Simulation and verification: Continuously adjust or replace the attribute parameters of the high-altitude balloon (including the geometric size, shape, and material parameters of the high-altitude balloon), and at the same time correspondingly change the solar irradiation time and the latitude data of the position where the high-altitude balloon is located, and repeatedly perform simulation calculations and result verification; 8) Develop reflection calculation software; 9) Calculate the influence of sphere reflection on calibration: Through the reflection calculation software, establish the corresponding relationship between the quantization value and the calibration accuracy of the solar cell, and perform calculations to determine the error or influence generated by different quantization values on the calibration result; 10) Develop software for analyzing the influence of reflection: After calculating the influence of sphere reflection on the calibration result, in order to eliminate the influence, develop software for analyzing the influence of sphere reflection to provide the possibility of reducing errors; Figure 7 is a schematic diagram of the operation of a software for analyzing sphere reflection provided by the present invention, as Figure 7 shown. The sphere reflection calculation software can calculate the influence of reflected light on the calibration result during the calibration of solar cells by high-altitude balloons. The software fits the shape of the high-altitude balloon based on a third-order Bessel curve, and by combining experimental parameters (such as solar altitude angle, longitude and latitude, time, etc.), dynamically simulates the incident angle and intensity change of the reflected light, and generates a curve of the intensity of the reflected light changing with time; at the same time, the software differentiates the reflectivity of different spectral bands (such as visible light and infrared light), so as to quantify the influence of the reflected light on the short-circuit current of the solar cell; the simulation results show that the software can quantitatively evaluate the calibration error caused by sphere reflection; 11) Summary of error influencing factors: Analyze the error data and determine the various influencing factors that cause the error (which is equivalent to the influencing factors on the intensity of the reflected light from the high-altitude balloon). For example, reasonable flight time and flight location can effectively reduce or even avoid the impact of spherical reflection on calibration. According to the software analysis results, spherical reflection depends on longitude and latitude, solar hour angle, and declination angle. These parameters jointly determine the incident angle between the sun's rays and the surface of the sphere, which directly affects the intensity of the reflected light. Therefore, choosing a suitable flight time can improve the accuracy of the calibration data. In addition, the choice of longitude and latitude also has a significant impact on the solar altitude angle and the intensity of reflected light. In different geographical locations, the movement trajectory of the sun is different, which means that in a certain time, the solar altitude angle and declination angle at different locations will be different. Therefore, during the flight of the high-altitude balloon, choosing low-latitude areas or specific seasons for experiments can ensure that the intensity of the reflected light is relatively low, thereby reducing interference with the calibration device. 11) The simulation software provides a theoretical basis for the formulation of protection strategies: Based on the calculation and verification results of the simulation software, reasonable strategies or measures can be formulated to reduce calibration errors and reduce the interference of reflected light on the calibration device.

[0063] The embodiment of the present invention can effectively calculate and analyze the path, intensity and impact of the sphere reflected light on the short-circuit current of the solar cell through precise sphere modeling. This refined modeling can not only reveal multiple sources of calibration errors, but also provide a theoretical basis for reflection control and data correction. Compared with the traditional method that only considers direct sunlight, the accuracy of the calibration results is greatly improved. Compared with the traditional calibration method that relies on theoretical derivation, the implementation of the present invention can better reflect the complex optical phenomena in the high-altitude environment, and can avoid the impact of sphere reflection on calibration by changing the flight time and location, reduce calibration errors, and make the calibration results closer to the actual situation.

[0064] Optionally, the path of the reflected light is also used to determine the illumination area of ​​the reflected light from the high-altitude balloon body; The illumination area is used to determine the shading angle of the light reflected from the high-altitude balloon body; The shading angle is used to shield the light reflected from the high-altitude balloon.

[0065] Specifically, according to the simulation results, when the surface of the sphere is smooth and continuous, the reflected light is also continuous, and it is difficult to avoid the influence of the reflected light. In addition, there is a certain difference between the two-dimensional model fitted by the third-order Bezier curve and the actual sphere, especially the lower half of the sphere, which has a greater impact on the calculation of the conditions for the occurrence of no reflected light. Therefore, the embodiment of the present invention considers light shielding protection for the calibration platform.

[0066] In order to block the reflected light, first determine the irradiation area of the reflected light from the high-altitude balloon sphere according to the path of the reflected light, and then determine the shading angle for the reflected light from the high-altitude balloon sphere according to the irradiation area. Thus, install a shading device (such as a shading cover, shading cloth, etc.) made of a shading material (such as a light-absorbing material coated with black paint) according to the calculated shading angle to block the reflected light from the high-altitude balloon sphere.

[0067] The overall shading protection process includes: calculating the angle between the reflected light and the horizontal plane according to the sphere reflection calculation software, determining the range of the reflected light angle, and analyzing the solar altitude angle, and then determining the shading angle. At the same time, optimize the geometric dimensions and installation positions of the shading cover (in this embodiment of the present invention, the shading cover is taken as an example of the shading device for illustration). Then, input the parameters corresponding to the high-altitude balloon in different situations and the flight condition data (such as latitude position, flight time, etc.) into the software for simulation, so as to verify whether the quantization value of the reflected light from the high-altitude balloon sphere that interferes with the solar cell calibration is effectively reduced after installing the shading cover, and improve the reliability of the shading scheme.

[0068] Figure 8 is a schematic diagram of shading protection provided by the present invention. As Figure 8 shown, by using the sphere reflection software to calculate the solar altitude angle and the incident angle of the reflected light, the change in the angle between the reflected light path and the horizontal plane can be obtained. It can be seen that the angle between the reflected light and the horizontal plane remains at about 67° to 68°, and the maximum value of the solar altitude angle is 50°. Therefore, starting from the position of the battery chip of the solar cell calibration device, blocking the light with an incident angle above 60° can achieve blocking the reflected light without blocking the direct light. Table 1 is a data record form of the demonstration calibration time and location provided by the present invention, as shown in Table 1.

[0069] Table 1 Data Record Form of Demonstration Calibration Time and Location The shading protection measures proposed in the embodiments of the present invention are a direct and effective technological innovation. By accurately calculating the solar altitude angle and the reflection angle, adding a shading structure to the calibration device, especially blocking the reflected light with an incident angle exceeding 60 degrees, can effectively reduce the interference of the sphere reflection on the solar cell calibration, thereby improving the calibration accuracy. This design scheme not only has the operability of implementation, but also can significantly reduce the error in the calibration process, making the performance evaluation of the solar cell in the actual use environment more accurate.

[0070] Next, a detection device for the reflected light of a high-altitude balloon sphere for solar cell calibration provided by the present invention will be described. The detection device for the reflected light of a high-altitude balloon sphere for solar cell calibration described below can be correspondingly referred to the detection method for the reflected light of a high-altitude balloon sphere for solar cell calibration described above.

[0071] Based on any of the above embodiments, Figure 9 FIG. 3 is a schematic structural diagram of a high-altitude balloon sphere reflected light detection device for solar cell calibration provided by the present invention, as Figure 9 shown. An embodiment of the present invention provides a high-altitude balloon sphere reflected light detection device for solar cell calibration, including an acquisition module 901, a generation module 902, a determination module 903, and a detection module 904, where: The acquisition module 901 is configured to acquire high-altitude balloon attribute parameters, the latitude of the location where the high-altitude balloon is located, and the solar irradiation time; the high-altitude balloon attribute parameters include the geometric dimensions, shape, and material parameters of the high-altitude balloon; the generation module 902 is configured to fit a two-dimensional model of the high-altitude balloon using a third-order Bezier curve based on the high-altitude balloon attribute parameters; the determination module 903 is configured to determine the solar altitude angle based on the latitude of the location where the high-altitude balloon is located and the solar irradiation time; the detection module 904 is configured to determine the quantization value of the high-altitude balloon sphere reflected light that interferes with the solar cell calibration based on the two-dimensional model and the solar altitude angle.

[0072] A high-altitude balloon sphere reflected light detection device for solar cell calibration provided by the present invention fits a two-dimensional model of the high-altitude balloon using a third-order Bezier curve based on high-altitude balloon attribute parameters, thereby establishing an accurate sphere geometric model; determines the solar altitude angle based on the latitude of the location where the high-altitude balloon is located and the solar irradiation time, thereby determining the angle of sunlight irradiating the high-altitude balloon; and then determines the quantization value of the high-altitude balloon sphere reflected light that interferes with the solar cell calibration based on the two-dimensional model and the solar altitude angle, thereby realizing accurate detection of the high-altitude balloon sphere reflected light through accurate and specific quantitative evaluation, and further improving the accuracy of solar cell calibration.

[0073] Figure 10 FIG. 4 is a schematic physical structure diagram of an electronic device, as Figure 10 shown. The electronic device may include: a processor 1010, a communication interface 1020, a memory 1030, and a communication bus 1040. Among them, the processor 1010, the communication interface 1020, and the memory 1030 communicate with each other through the communication bus 1040. The processor 1010 can call the logical instructions in the memory 1030 to execute a high-altitude balloon sphere reflected light detection method for solar cell calibration, and the method includes: Acquire high-altitude balloon attribute parameters, the latitude of the location where the high-altitude balloon is located, and the solar irradiation time; the high-altitude balloon attribute parameters include the geometric dimensions, shape, and material parameters of the high-altitude balloon; Based on the high-altitude balloon attribute parameters, a two-dimensional model of the high-altitude balloon is fitted using a third-order Bezier curve; Based on the latitude of the location where the high-altitude balloon is located and the solar irradiation time, the solar altitude angle is determined; Based on the two-dimensional model and the solar altitude angle, a quantization value of the spherical reflected light of the high-altitude balloon that interferes with the solar cell calibration is determined.

[0074] In addition, when the logical instructions in the above-mentioned memory 1030 are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0075] On the other hand, the present invention also provides a computer program product. The computer program product includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the method for detecting the spherical reflected light of a high-altitude balloon for solar cell calibration provided by the above-mentioned various methods. The method includes: Obtain high-altitude balloon attribute parameters, the latitude of the location where the high-altitude balloon is located, and the solar irradiation time; the high-altitude balloon attribute parameters include the geometric dimensions, shape, and material parameters of the high-altitude balloon; Based on the high-altitude balloon attribute parameters, a two-dimensional model of the high-altitude balloon is fitted using a third-order Bezier curve; Based on the latitude of the location where the high-altitude balloon is located and the solar irradiation time, the solar altitude angle is determined; Based on the two-dimensional model and the solar altitude angle, a quantization value of the spherical reflected light of the high-altitude balloon that interferes with the solar cell calibration is determined.

[0076] On yet another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the method for detecting the spherical reflected light of a high-altitude balloon for solar cell calibration provided by the above-mentioned various methods. The method includes: Obtain the property parameters of the high-altitude balloon, the latitude of the location where the high-altitude balloon is located, and the solar irradiation time; the high-altitude balloon property parameters include the geometric size, shape, and material parameters of the high-altitude balloon; Based on the high-altitude balloon property parameters, use a third-order Bezier curve to fit the two-dimensional model of the high-altitude balloon; Based on the latitude of the location where the high-altitude balloon is located and the solar irradiation time, determine the solar altitude angle; Based on the two-dimensional model and the solar altitude angle, determine the quantization value of the spherical reflected light of the high-altitude balloon that interferes with the calibration of the solar cell.

[0077] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative work.

[0078] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0079] It should be noted that in this text, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0080] "Determining B based on A" in the embodiments of the present application means that the factor A should be considered when determining B. It is not limited to "determining B only based on A", and should also include: "determining B based on A and C", "determining B based on A, C and E", "determining C based on A and further determining B based on C", etc. Additionally, it may also include using A as a condition for determining B. For example, "when A meets the first condition, use the first method to determine B"; another example, "when A meets the second condition, determine B"; and another example, "when A meets the third condition, determine B based on the first parameter". Of course, it may also be using A as a condition for the factor of determining B. For example, "when A meets the first condition, use the first method to determine C and further determine B based on C", etc.

[0081] The term "plurality" in the present invention means two or more, and other quantifiers are similar.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting the reflected light of a high-altitude balloon sphere for solar cell calibration, characterized in that including: Obtain the high-altitude balloon attribute parameters, the latitude of the location where the high-altitude balloon is located, and the solar irradiation time; The high-altitude balloon attribute parameters include the geometric size, shape, and material parameters of the high-altitude balloon; Based on the high-altitude balloon attribute parameters, use a third-order Bezier curve to fit the two-dimensional model of the high-altitude balloon; Based on the latitude of the location where the high-altitude balloon is located and the solar irradiation time, determine the solar altitude angle; Based on the two-dimensional model and the solar altitude angle, determine the quantization value of the spherical reflected light of the high-altitude balloon that interferes with the calibration of the solar cell.

2. The method for detecting the reflected light of the high-altitude balloon sphere for solar cell calibration according to claim 1, wherein The determining the quantization value of the spherical reflected light of the high-altitude balloon that interferes with the calibration of the solar cell based on the two-dimensional model and the solar altitude angle includes: Based on the two-dimensional model and the solar altitude angle, determine the reflection angle and reflectivity of the reflected light of the sunlight irradiating the high-altitude balloon; Based on the reflection angle and the reflectivity, calculate the change amount of the reflected light on the short-circuit current in the solar cell; Use the change amount of the short-circuit current as the quantization value of the spherical reflected light of the high-altitude balloon that interferes with the calibration of the solar cell.

3. The method for detecting the reflected light of the high-altitude balloon sphere for solar cell calibration according to claim 2, characterized in that, The calculating the change amount of the reflected light on the short-circuit current in the solar cell based on the reflection angle and the reflectivity includes: Based on the reflection angle and the reflectivity, determine the path of the reflected light; Based on the path of the reflected light, determine the light intensity of the reflected light irradiating the solar cell calibration device; Based on the light intensity, calculate the change amount of the reflected light on the short-circuit current in the solar cell.

4. The method for detecting reflected light of a high-altitude balloon sphere for solar cell calibration according to claim 2, wherein The calculation expression of the change amount of the reflected light on the short-circuit current in the solar cell is as follows: Among them, represents the change amount of the short-circuit current in the solar cell generated by the reflected light, represents the reflectivity of the reflected light of the sunlight irradiating the high-altitude balloon, represents the control point coordinates of the curve in the y-axis direction in the two-dimensional model, represents the control point coordinates of the curve in the x-axis direction in the two-dimensional model, represents a parameter with a value range of [0, 1], used to parameterize the points on the curve in the two-dimensional model, represents the parameter corresponding to the irradiation point where the sun's rays irradiate the high-altitude balloon, represents the latitude of the location where the high-altitude balloon is located, represents the declination angle, represents the angle between the meridian plane of the location where the solar cell calibration device is located and the solar meridian plane.

5. The method for detecting the reflected light of the high-altitude balloon sphere for solar cell calibration according to claim 3, wherein, The path of the reflected light is also used to determine the irradiation area of the spherical reflected light of the high-altitude balloon; The irradiation area is used to determine the shading angle of the spherical reflected light of the high-altitude balloon; The shading angle is used to block the spherical reflected light of the high-altitude balloon.

6. The method for detecting the reflected light of the high-altitude balloon sphere for solar cell calibration according to claim 1, wherein After determining the quantization value of the spherical reflected light of the high-altitude balloon that interferes with the calibration of the solar cell based on the two-dimensional model and the solar altitude angle, it further includes: Perform simulation calculations on the quantization value to determine the influencing factors of the intensity of the spherical reflected light of the high-altitude balloon.

7. A high-altitude balloon sphere reflected light detection device for solar cell calibration, characterized in that, including: An acquisition module for obtaining high-altitude balloon attribute parameters, the latitude of the location where the high-altitude balloon is located, and the solar irradiation time; The high-altitude balloon attribute parameters include the geometric size, shape, and material parameters of the high-altitude balloon; A generation module for using a third-order Bezier curve to fit the two-dimensional model of the high-altitude balloon based on the high-altitude balloon attribute parameters; A determination module for determining the solar altitude angle based on the latitude of the location where the high-altitude balloon is located and the solar irradiation time; A detection module for determining the quantization value of the spherical reflected light of the high-altitude balloon that interferes with the calibration of the solar cell based on the two-dimensional model and the solar altitude angle.

8. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the method for detecting the spherical reflected light of a high-altitude balloon for solar cell calibration according to any one of claims 1 to 6.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the method for detecting the spherical reflected light of a high-altitude balloon for solar cell calibration according to any one of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method for detecting the reflected light of the high-altitude balloon sphere for solar cell calibration according to any one of claims 1 to 6.

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