CN112234942B - Solar simulator nonuniformity detection method and photochromic plate - Google Patents
Solar simulator nonuniformity detection method and photochromic plate Download PDFInfo
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Abstract
The invention provides a solar simulator nonuniformity detection method and a photochromic plate, and belongs to the technical field of photovoltaic module testing. According to the solar simulator nonuniformity detection method provided by the invention, the integral irradiation condition of the solar simulator is determined in one nonuniformity test through the photochromic plate, different test areas in an effective area are not required to be tested one by one through a small-size packaged battery, the time consumption is short, the test efficiency is high, the method can be applied to high-frequency solar simulator nonuniformity detection, the nonuniform abnormality in the overall irradiation can be determined in time, the problem of missing the abnormality caused by long time consumption is avoided, and the accuracy of the photovoltaic module test by the solar simulator is improved.
Description
Technical Field
The invention relates to the technical field of photovoltaic module testing, in particular to a solar simulator nonuniformity detection method and a photochromic plate.
Background
At present, a solar simulator is generally used to test a characteristic curve, i.e., an IV (current-voltage) curve, of a photovoltaic module, thereby testing the performance of the photovoltaic module. However, the solar simulator inevitably has the problems of spectrum mismatch, uneven irradiation and the like in the process of simulating sunlight, so that the accuracy of the IV curve test is affected, and therefore, the illumination simulation performance of the solar simulator needs to be detected and monitored at high frequency, and the occurrence of uneven irradiation is discovered in time, so that the long-term stability of the photovoltaic module test is ensured.
For the detection of the solar simulator, a small-sized packaged battery is often adopted to gradually test the light irradiation effective area of the solar simulator so as to determine the irradiation nonuniformity of the solar simulator, the gradual test of the small-sized packaged battery consumes long time and multiple steps, so that frequent detection cannot be performed, and the single detection consumes long time so that the abnormality of nonuniform irradiation may be missed, so that the test result of the solar simulator on a photovoltaic assembly has deviation.
Disclosure of Invention
The invention provides a solar simulator nonuniformity detection method and a photochromic plate, which aim to solve the problems that in the prior art, solar simulator nonuniformity detection consumes long time and test results of photovoltaic modules are low in accuracy.
In a first aspect, a solar simulator non-uniformity detection method is provided, which may include:
dividing an effective area into N test areas, wherein the effective area is an irradiation area of the solar simulator, and N is greater than or equal to 2;
placing a first photochromic plate in the effective area, and detecting irradiation nonuniformity of the solar simulator, wherein the first photochromic plate comprises M first small photochromic plates, the area of the first small photochromic plates is smaller than or equal to that of the test area, and M is larger than or equal to N;
acquiring a test gray level picture of the first photochromic plate;
determining a first maximum current value and a first minimum current value corresponding to the photochromic plate according to a first gray value of the first small photochromic plate in the test gray picture and a corresponding relation between a standard gray value and a standard current value;
and determining irradiation unevenness data of the solar simulator according to the first maximum current value and the first minimum current value.
Optionally, before the placing the first photochromic plate in the active area and performing the irradiation nonuniformity detection on the solar simulator, the method further includes:
and determining the corresponding relation between the standard gray value and the standard current value according to the calibration gray level picture corresponding to the second photochromic plate and the second current value corresponding to the test region, wherein the second photochromic plate comprises M 'second small photochromic plates, the area of each second small photochromic plate is smaller than or equal to that of the test region, and M' is larger than or equal to N.
Optionally, the determining a corresponding relationship between the standard gray value and the standard current value according to the calibration gray image corresponding to the second photochromic plate and the second current value corresponding to the test region includes:
testing the test regions one by adopting packaged batteries, and determining a second current value corresponding to each test region, wherein the size of each packaged battery corresponds to the area of each test region;
placing a second photochromic plate in the effective area, and carrying out irradiation nonuniformity detection on the solar simulator;
acquiring a calibration gray level picture of the second photochromic plate;
and determining the corresponding relation between the standard gray value and the standard current value according to the second gray value of the second small color changing plate in the calibration gray picture and the second current value of the test area corresponding to the second small color changing plate.
Optionally, the test area is a square area with an edge length of any value of 160nm to 200 nm.
Optionally, the light facing surface of the first small color changing plate is coated with a photochromic material, and the photochromic material is silver halide.
Optionally, the active area is perpendicular to an angle of incidence of illumination of the solar simulator.
Optionally, the distance between the effective area and the solar simulator is any value of 5-8 meters.
Optionally, the determining irradiation unevenness data of the solar simulator according to the first maximum current value and the first minimum current value includes:
determining a difference between the first maximum current value and the first minimum current value and a first ratio of the first maximum current value to the sum of the first minimum current value;
and determining the first ratio as the irradiation unevenness data of the solar simulator.
Optionally, the determining a correspondence between a standard gray value and a standard current value according to a second gray value of the second small color changing plate in the calibration gray picture and a second current value of the test region corresponding to the second small color changing plate includes:
determining a second maximum gray value corresponding to a second maximum current value of the test area and a second minimum gray value corresponding to a second minimum current value according to a second gray value of the second small color changing plate in the calibration gray picture and a second current value of the test area corresponding to the second small color changing plate;
determining a difference between the second maximum current value and the second minimum current value and a second ratio of the difference between the second maximum grayscale value and the second minimum grayscale value;
and taking the second ratio as the corresponding relation between the standard gray value and the standard current value.
Optionally, the determining, according to the first gray value of the first small color changing plate in the test gray picture and the corresponding relationship between the standard gray value and the standard current value, a first maximum current value and a first minimum current value corresponding to the photochromic plate includes:
respectively calculating the gray value difference between the second maximum gray value and the first gray value of each first small color changing plate;
respectively calculating the product of the gray value difference of each first small color-changing plate and the second ratio to obtain a current change value;
respectively calculating the difference value between the second maximum current value and the current change value of each first small color changing plate to obtain a first current value corresponding to each first small color changing plate;
determining the first maximum current value and the first minimum current value of the photochromic plate among the first current values.
In a second aspect, embodiments of the present invention provide a photochromic plate, which is used in the solar simulator non-uniformity detection method according to the first aspect.
Compared with the related art, the invention has the following advantages:
in the embodiment of the invention, the irradiation nonuniformity of the solar simulator is tested according to the color change condition of a first photochromic plate, the effective area of the solar simulator is divided into N test areas, the first photochromic plate is placed in the effective area and loaded with M first small photochromic plates, wherein the area of the first small photochromic plate is larger than or equal to that of the test area, and M is larger than or equal to N, therefore, the first small photochromic plate can cover all the test areas and change color under irradiation, then a test gray level picture of the first photochromic plate is obtained, so that the first maximum current value and the first minimum current value in the current test can be determined according to the first gray value of the first small photochromic plate and the corresponding relation between the standard gray value and the standard current value, and then the irradiation nonuniformity data of the solar simulator is determined according to the first maximum current value and the first minimum current value, the method can determine the integral irradiation condition of the solar simulator in one test through the photochromic plate, does not need to test different test areas in an effective area one by one through a small-size packaged battery, is simple and convenient to operate, short in consumed time and high in test efficiency, can be applied to high-frequency solar simulator nonuniformity detection, can determine nonuniform abnormal phenomena in comprehensive irradiation in time, avoids the problem that the abnormal phenomena are missed due to long consumed time, and improves the accuracy of the solar simulator in testing the photovoltaic module.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a flow chart illustrating steps of a method for detecting non-uniformity in a solar simulator according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating steps in another method for detecting non-uniformity in a solar simulator according to an embodiment of the present invention;
FIG. 3 is an interaction diagram of example 1 provided by an embodiment of the invention;
FIG. 4 is a matrix of example 1 current values provided by embodiments of the present invention;
FIG. 5 is a diagram illustrating a first interaction of example 2 according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a second interaction of example 2 according to an embodiment of the present invention;
fig. 7 is a structural view of a second photochromic plate according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a calibrated grayscale picture provided by an embodiment of the present invention;
FIG. 9 is a schematic diagram of a test gray scale picture provided by an embodiment of the present invention;
fig. 10 is a first current value matrix of example 2 provided by an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Fig. 1 is a flowchart illustrating steps of a method for detecting non-uniformity of a solar simulator according to an embodiment of the present invention, where the method may include:
In the embodiment of the invention, the solar simulator is an instrument with at least one surface capable of simulating luminescence, wherein after the luminous surface of the solar simulator emits light, the illumination coverage area is the irradiation area of the solar simulator. When the solar simulator tests the photovoltaic module, different positions and angles in an irradiation area can be selected to test the photovoltaic module according to different specifications and performance requirements of the photovoltaic module, and at the moment, the irradiation area corresponding to the position and the angle is an effective area corresponding to the photovoltaic module.
In the embodiment of the invention, because the light emitting surface of the solar simulator is usually a large-size lamp array, at the moment, when the solar simulator breaks down, abnormal conditions such as damage, luminous power attenuation and the like of partial lamps in the lamp array usually occur, so that the spectrum matching degree and the irradiation uniformity of the whole solar simulator are influenced. Therefore, in order to determine the position where the abnormal condition occurs and avoid the interference of the normal lamp light emission to the abnormal lamp in the test, the effective area can be divided into N test areas, and N is greater than or equal to 2. Alternatively, the test area may be in the shape of a square, triangle, hexagon, etc. that can be pieced together to cover the entire area.
102, placing a first photochromic plate in the effective area, and detecting irradiation nonuniformity of the solar simulator, wherein the first photochromic plate comprises M first small photochromic plates, the area of the first small photochromic plates is smaller than or equal to that of the test area, and M is larger than or equal to N.
In an embodiment of the present invention, the first photochromic plate is a plate that carries a first small photochromic plate, the area of the first small photochromic plate is larger than or equal to the effective area, the first small photochromic plate is a plate that changes color when exposed to light and has different irradiation intensities and different degrees of color change, optionally, the first small photochromic plate may be in a shape of a square, a triangle, a hexagon, etc. that can be spliced to cover the complete area, wherein the first small photochromic plate may be in a matrix splicing arrangement on the first photochromic plate, or the first small photochromic plate may also be in a staggered splicing arrangement on the first photochromic plate, which is not limited in this embodiment of the present invention.
In the embodiment of the invention, M first small color changing plates can be loaded on the first photochromic plate, wherein the area of the first small color changing plate can be smaller than or equal to that of the test area, so that after the first photochromic plate is placed in the effective area, the position of the test area can correspond to the first small color changing plate, and each test area is tested respectively. Alternatively, when the area of the first small metamorphic plate is equal to the area of the test region, M may be greater than or equal to N, and when the area of the first small metamorphic plate is smaller than the test region, M may be greater than N, so as to ensure global coverage of the effective region.
And 103, acquiring a test gray level picture of the first photochromic plate.
In the embodiment of the invention, a test gray picture of the light receiving surface of the first photochromic plate can be obtained after the first photochromic plate is irradiated and discolored by the solar simulator, namely, a picture with the white color and the black color divided into 256 steps according to the logarithmic relation, and the difference of the irradiation intensity received by different first small photochromic plates can be determined through the gray difference of different first small photochromic plates.
And step 104, determining a first maximum current value and a first minimum current value corresponding to the photochromic plate according to the first gray value of the first small photochromic plate in the test gray picture and the corresponding relation between the standard gray value and the standard current value.
In the embodiment of the present invention, the correspondence between the standard gray value and the standard current value may be a correspondence between a size of a gray value calibrated in advance through a test and a size of a current value, or may also be a correspondence between a variation value of a gray value and a variation value of a current value, at this time, according to a first gray value corresponding to each first small color-changing plate in a test gray picture, first current values corresponding to all first small color-changing plates on a first photochromic plate may be determined, so that a first maximum current value and a first minimum current value are determined according to a size of the first current value.
And 105, determining irradiation unevenness data of the solar simulator according to the first maximum current value and the first minimum current value.
In the embodiment of the invention, because the irradiation intensities in the effective region are equal everywhere under the ideal condition that the irradiation of the solar simulator is uniform, the difference between the maximum irradiation intensity and the minimum irradiation intensity of the solar simulator can be determined according to the first maximum current value and the first minimum current value, so that the irradiation unevenness data of the solar simulator can be determined.
In the embodiment of the invention, the irradiation nonuniformity of the solar simulator is tested according to the color change condition of a first photochromic plate, the effective area of the solar simulator is divided into N test areas, the first photochromic plate is placed in the effective area and loaded with M first small photochromic plates, wherein the area of the first small photochromic plate is larger than or equal to that of the test area, and M is larger than or equal to N, therefore, the first small photochromic plate can cover all the test areas and change color under irradiation, then a test gray level picture of the first photochromic plate is obtained, so that the first maximum current value and the first minimum current value in the current test can be determined according to the first gray value of the first small photochromic plate and the corresponding relation between the standard gray value and the standard current value, and then the irradiation nonuniformity data of the solar simulator is determined according to the first maximum current value and the first minimum current value, the method can determine the integral irradiation condition of the solar simulator in one test through the photochromic plate, does not need to test different test areas in an effective area one by one through a small-size packaged battery, is simple and convenient to operate, short in consumed time and high in test efficiency, can be applied to high-frequency solar simulator nonuniformity detection, can determine nonuniform abnormal phenomena in comprehensive irradiation in time, avoids the problem that the abnormal phenomena are missed due to long consumed time, and improves the accuracy of the solar simulator in testing the photovoltaic module.
Fig. 2 is a flowchart illustrating steps of another solar simulator non-uniformity detection method according to an embodiment of the present invention, where the method may include:
In the embodiment of the present invention, a calibration gray scale picture of the effective area of the solar simulator can be obtained through the second photochromic plate, the second photochromic plate includes M' second small photochromic plates, where the second photochromic plate, the second small photochromic plate, and the calibration gray scale picture of the effective area of the solar simulator obtained through the second photochromic plate correspond to the description of the first photochromic plate, the first small photochromic plate and the test gray scale picture of the effective area of the solar simulator in fig. 1, and in order to avoid repetition, no further description is provided herein.
In the embodiment of the invention, under the condition that the solar simulator works, the second current value corresponding to the test area can be obtained through the solar cell, and each test area can be tested by adopting the same solar cell, at the moment, the second current values are the same when the irradiation intensity is the same, the second current values are the same when the irradiation intensity is different, the gray values are the same when the irradiation intensity is the same, and the gray values are different when the irradiation intensity is different, so that the corresponding relation between the standard gray value and the standard current value can be determined according to the second current value and the calibration gray picture.
Optionally, the test area is a square area with an edge length of any value of 160nm to 200 nm.
In the embodiment of the present invention, the test region may be a square region having a side length of any value between 160nm and 200nm, such as 160nm, 170nm, 180nm, 190nm, or 200nm, which is not limited in the embodiment of the present invention.
Optionally, the step 201 includes:
step S11, testing the test regions one by adopting packaged batteries, and determining a second current value corresponding to each test region, wherein the size of each packaged battery corresponds to the area of each test region.
In the embodiment of the present invention, the packaged battery is a solar battery with a certain size, the size of the packaged battery may also be different according to different areas of the test regions, optionally, the test regions may be tested one by using the packaged battery, so as to determine the second current value corresponding to each test region, optionally, according to different arrangement modes of the test regions in the effective region, the directions and the sequences of the test regions may also be different one by one, for example, the test regions may be tested one by one in a clockwise spiral manner, tested one by one in a counterclockwise spiral manner, tested one by one in an oblique S-shape manner, and the like.
And step S12, placing a second photochromic plate in the effective area, and detecting the irradiation nonuniformity of the solar simulator.
And step S13, obtaining a calibration gray scale picture of the second photochromic plate.
In the embodiment of the present invention, reference may be made to the related descriptions of the foregoing steps 102 to 103 in the steps S12 to S13, and details are not repeated herein for avoiding repetition.
Optionally, the active area is perpendicular to an angle of incidence of illumination of the solar simulator.
Optionally, the distance between the effective area and the solar simulator is any value of 5-8 meters.
In the embodiment of the present invention, a position of any value within a range from 5 meters to 8 meters away from the solar simulator and a region perpendicular to an illumination incident angle of the solar simulator may be used as an effective region, where the effective region may be any value between 5 meters and 8 meters, such as 5 meters, 6 meters, 7 meters, 7.5 meters, and 8 meters, or may be other angles, and this is not particularly limited in the embodiment of the present invention.
Step S14, determining a correspondence between a standard gray value and a standard current value according to a second gray value of the second small color changing plate in the calibration gray picture and a second current value of the test region corresponding to the second small color changing plate.
In the embodiment of the invention, each second small color-changing plate in the calibrated gray picture can read the corresponding second gray value, and each second small color-changing plate can correspond to one test area similarly to the first small color-changing plate, so that the corresponding relation between the standard gray value and the standard current value can be determined according to the second gray value and the second current value corresponding to the same test area.
Optionally, the step S14 includes:
step S141, determining a second maximum gray value corresponding to a second maximum current value of the test region and a second minimum gray value corresponding to a second minimum current value according to a second gray value of the second small color changing plate in the calibrated gray picture and a second current value of the test region corresponding to the second small color changing plate.
In the embodiment of the present invention, since the magnitude of the irradiation intensity is related to the magnitude of the second gray scale value and the magnitude of the second current value, the magnitude of the further second gray scale value has a certain relationship with the magnitude of the second current value, at this time, the second maximum current value corresponds to the maximum irradiation intensity with the second maximum gray scale value, and the second minimum current value corresponds to the minimum irradiation intensity with the second minimum gray scale value, and according to the second maximum current value, the second maximum gray scale value, the second minimum current value and the second minimum gray scale value, the variation relationship between the second current value and the second gray scale value in the irradiation intensities from the maximum to the minimum can be determined.
Step S142, determining a difference between the second maximum current value and the second minimum current value, and a second ratio of the difference between the second maximum gray value and the second minimum gray value.
In the embodiment of the present invention, a difference between the second maximum current value and the second minimum current value may be divided by a difference between the second maximum gray scale value and the second minimum gray scale value to obtain a second ratio, where the second ratio is a change rate of the second current value relative to the second gray scale value, and the second current value may be increased by a fixed value every time the second gray scale value is increased by a fixed value according to the second ratio.
And S143, taking the second ratio as the corresponding relation between the standard gray value and the standard current value.
In the embodiment of the present invention, a fixed value of any second gray value may be used as the standard gray value, and the corresponding standard current value is determined according to the second ratio, so that the second ratio is used as a corresponding relationship between the standard gray value and the standard current value, optionally, the standard gray value should be greater than 0 and less than or equal to the maximum value of the gray value, for example, when the maximum value of the gray value is 256 levels, the standard gray value may be 1 level, 2 levels, 3 levels · · 256 levels, and the like.
And step 204, obtaining a test gray level picture of the first photochromic plate.
In the embodiment of the present invention, steps 202 to 205 may be referred to the related descriptions of steps 101 to 104, and are not repeated herein for avoiding repetition.
Optionally, the light facing surface of the first small color changing plate is coated with a photochromic material, and the photochromic material is silver halide.
In the embodiment of the present invention, the photochromic material may be coated on the first small color-changing plate to change color under irradiation of the solar simulator, wherein a silver halide with high color-changing efficiency may be selected as the photochromic material, and optionally, the silver halide may be silver chloride, silver bromide, silver iodide, etc., which is not particularly limited in this respect, and the type, coating thickness, coating area, etc. of the photochromic material of different first small color-changing plates may be kept consistent to reduce the measurement error.
In this embodiment of the present invention, the first maximum current value and the second minimum current value may be respectively subjected to a difference sum, and then a first ratio of the difference to the sum is obtained, so as to determine a relative deviation between the first maximum current value and the first minimum current value.
And step 207, determining the first ratio as irradiation unevenness data of the solar simulator.
In the embodiment of the invention, the relative deviation of the first maximum current value and the second maximum current value can evaluate the deviation degree of the maximum value and the minimum value in the first current value, so that the irradiation unevenness data of the solar simulator can be determined according to the first ratio,
in summary, in the embodiment of the present invention, the irradiation nonuniformity of the solar simulator is tested according to the color change condition of the first photochromic plate, the effective area of the solar simulator is divided into N test areas, the first photochromic plate is placed in the effective area and loaded with M first small photochromic plates, wherein the area of the first small photochromic plate is greater than or equal to the area of the test area, and M is greater than or equal to N, so that the first small photochromic plate can cover all the test areas and change color under irradiation, and then a test gray scale image of the first photochromic plate is obtained, so as to determine the first maximum current value and the first minimum current value in the current test according to the first gray scale value of the first small photochromic plate and the corresponding relationship between the standard gray scale value and the standard current value, and then determine the irradiation nonuniformity data of the solar simulator according to the first maximum current value and the first minimum current value, the method can determine the integral irradiation condition of the solar simulator in one test through the photochromic plate, does not need to test different test areas in an effective area one by one through a small-size packaged battery, is short in time consumption and high in test efficiency, can be applied to high-frequency solar simulator nonuniformity detection, can determine the nonuniform abnormal phenomenon in comprehensive irradiation in time, avoids the problem of missing the abnormal phenomenon caused by long time consumption, and improves the accuracy of the solar simulator in testing the photovoltaic assembly.
The embodiment of the invention also provides a photochromic plate, which is used for the solar simulator nonuniformity detection method described in the figure 1 or the figure 2.
The solar simulator non-uniformity detection method provided by the invention is illustrated by the following examples:
example 1
Fig. 3 is an interactive schematic diagram of example 1 provided by an embodiment of the present invention, and as shown in fig. 3, includes a side-lit solar simulator 301, an active area 302, and an encapsulated battery 303.
For the side-lit solar simulator 301, an active area 302 of 2000 mm × 2600 mm in area was divided into 130 test areas (13 × 10), each having an area of 200 mm × 200 mm.
Fig. 4 is a current value matrix of example 1 provided by an embodiment of the present invention, and short-circuit currents of 130 test areas are tested one by one in the S-shaped arrow direction by using a packaged battery with a size of 200 mm × 200 mm to obtain the current value matrix of example 1 shown in fig. 4, where each test area corresponds to one current value in the current value matrix.
In the current value matrix of example 1 shown in fig. 4, the maximum current value and the minimum current value are determined, and the irradiation unevenness data of the side lighting simulator is calculated, and the formula (1) for calculating the irradiation unevenness data is as follows:
at this time, the maximum current value is 9.873 and the minimum current value is 9.713 in the current value matrix of example 1, and therefore, the irradiation unevenness data is calculated as follows by substituting equation (1):
according to IEC (International electrotechnical Commission) 60904-9, the irradiation unevenness data of the solar simulator is 0.8%, and the irradiation unevenness grade is A+。
Example 2
Fig. 5 is a first interactive schematic diagram of example 2 provided by the embodiment of the present invention, as shown in fig. 5, including a side-lighting solar simulator 401, an active area 402, a packaged battery 403, and a camera 404.
For the side-lit solar simulator 401, an active area 402 having an area of 2000 mm × 2600 mm was divided into 130 test areas (13 × 10), each having an area of 200 mm × 200 mm.
As shown in fig. 5, 130 test regions are tested one by one for short-circuit current in the S-shaped arrow direction using a packaged battery with a size of 200 mm × 200 mm, to obtain a second current value matrix of example 2, wherein each test region corresponds to one current value in the current value matrix, and the second current value matrix of example 2 may correspond to the current value matrix of example 1 shown in fig. 4.
A second photochromic plate is placed in the effective area 402, the irradiation nonuniformity test is carried out on the side-lit solar simulator 401, fig. 6 is a second interactive schematic diagram of the example 2 provided by the embodiment of the invention, and as shown in fig. 6, on the basis of fig. 5, a second photochromic plate 405 is placed in the position of the effective area 402. Fig. 7 is a structural diagram of a second photochromic plate according to an embodiment of the present invention, and as shown in fig. 7, 130 independent second small color-changing plates are loaded on the second photochromic plate to form a 13 × 10 array.
A calibrated gray scale picture of the second photochromic plate 405 after receiving the irradiation for color change is taken by the camera 404, and fig. 8 is a schematic diagram of the calibrated gray scale picture provided by the embodiment of the present invention, as shown in fig. 8.
From the scaled grayscale picture shown in fig. 8 and the second current value matrix of example 2 shown in fig. 4, the second maximum grayscale value is 230, the second maximum current value is 9.873, the second minimum grayscale value is 138, and the second minimum current value 9.713 are determined by color-to-color comparison as shown in the following table:
at this time, equation (2) for calculating the second ratio Δ I is as follows:
the second ratio Δ I is a variation value of the current value corresponding to the gray scale value 1, and the second maximum gray scale value is 230, the second maximum current value is 9.873, the second minimum gray scale value is 138, and the second minimum current value 9.713 are substituted into the formula (2) to calculate as follows:
and determining the standard current value 0.0017 corresponding to the 1-order standard gray value according to the second ratio delta I.
A first photochromic sheet is placed in the active area 402 and the side-lit solar simulator 401 is tested for irradiance non-uniformity.
A test gray scale picture of the first photochromic plate discolored after receiving irradiation is taken by the camera 404, and fig. 9 is a schematic view of the test gray scale picture provided by the embodiment of the present invention, as shown in fig. 9.
According to the first gray values of the first small color changing plate in the test gray picture shown in fig. 9 and the corresponding relationship between the standard gray values and the standard current values, the first current value corresponding to each first gray value is determined by the following formula (3), and the first current value matrix of example 2 shown in fig. 10 is obtained:
i ═ the second maximum current value- Δ I · (second maximum grayscale value-first grayscale value) · (3) for example, when the first grayscale value is 219, the corresponding first current value is:
9.873-0.0017×(230-219)＝9.854
according to the first current value matrix of example 2 shown in fig. 10, the first maximum current value and the first minimum current value are determined, and the irradiation unevenness data is calculated as shown in the following equation (4):
at this time, the maximum current value is 9.899 and the minimum current value is 9.669 in the first current value matrix of example 2, and therefore, the irradiation unevenness data is calculated as follows by substituting equation (4):
according to IEC (international electrotechnical commission) 60904-9, the irradiation unevenness data of the solar simulator is 1.2%, and the irradiation unevenness grade is a.
In the embodiment of the invention, as shown in example 1, in the process of testing the side-lighting solar simulator, all the test areas in the effective areas need to be tested one by one through the packaged batteries each time, which is long in time consumption, low in efficiency and inaccurate, in example 2, all the test areas in the effective areas need to be tested one by one through the packaged batteries only once, so that the corresponding relation between the calibration gray value and the calibration current value is determined, then the overall irradiation condition of the side-lighting solar simulator can be rapidly obtained through the first photochromic plate, the time consumption is short, the efficiency is high, the absolute error of the test result of example 2 is less than 0.2% relative to that of example 1, the test result is accurate, therefore, the abnormal condition of the solar simulator can be rapidly monitored at high frequency through the method shown in example 2, so that the solar simulator can be timely checked and maintained, and the stability of the device can be ensured, accuracy of test result of photovoltaic module by solar simulator is improved
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described apparatuses and modules may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (9)
1. A solar simulator non-uniformity detection method, the method comprising:
dividing an effective area into N test areas, wherein the effective area is an irradiation area of the solar simulator, and N is greater than or equal to 2;
placing a first photochromic plate in the effective area, and detecting irradiation nonuniformity of the solar simulator, wherein the first photochromic plate comprises M first small photochromic plates, the area of the first small photochromic plates is smaller than or equal to that of the test area, and M is larger than or equal to N;
acquiring a test gray level picture of the first photochromic plate;
determining a first maximum current value and a first minimum current value corresponding to the photochromic plate according to a first gray value of the first small photochromic plate in the test gray picture and a corresponding relation between a standard gray value and a standard current value;
determining a difference between the first maximum current value and the first minimum current value and a first ratio of the first maximum current value to the sum of the first minimum current value;
and determining the first ratio as the irradiation unevenness data of the solar simulator.
2. The method of claim 1, wherein the placing the first photochromic sheet over the active area before detecting the irradiance non-uniformity in the solar simulator further comprises:
and determining the corresponding relation between the standard gray value and the standard current value according to the calibration gray level picture corresponding to the second photochromic plate and the second current value corresponding to the test region, wherein the second photochromic plate comprises M 'second small photochromic plates, the area of each second small photochromic plate is smaller than or equal to that of the test region, and M' is larger than or equal to N.
3. The method of claim 2, wherein determining the correspondence between the standard gray scale value and the standard current value according to the calibration gray scale picture corresponding to the second photochromic plate and the second current value corresponding to the test region comprises:
testing the test regions one by adopting packaged batteries, and determining a second current value corresponding to each test region, wherein the size of each packaged battery corresponds to the area of each test region;
placing a second photochromic plate in the effective area, and carrying out irradiation nonuniformity detection on the solar simulator;
acquiring a calibration gray level picture of the second photochromic plate;
and determining the corresponding relation between the standard gray value and the standard current value according to the second gray value of the second small color changing plate in the calibration gray picture and the second current value of the test area corresponding to the second small color changing plate.
4. The method of claim 1, wherein the test area is a square area having a side length of any value from 160nm to 200 nm.
5. The method of claim 1, wherein the light-facing surface of the first small palette is coated with a photochromic material, the photochromic material being a silver halide.
6. The method of claim 1, wherein the active area is perpendicular to an angle of incidence of illumination of the solar simulator;
the distance between the effective area and the solar simulator is any value of 5-8 meters.
7. The method according to claim 3, wherein determining the correspondence between the standard gray value and the standard current value according to the second gray value of the second small color changing plate in the calibration gray picture and the second current value of the test area corresponding to the second small color changing plate comprises:
determining a second maximum gray value corresponding to a second maximum current value of the test area and a second minimum gray value corresponding to a second minimum current value according to a second gray value of the second small color changing plate in the calibration gray picture and a second current value of the test area corresponding to the second small color changing plate;
determining a difference between the second maximum current value and the second minimum current value and a second ratio of the difference between the second maximum grayscale value and the second minimum grayscale value;
and taking the second ratio as the corresponding relation between the standard gray value and the standard current value.
8. The method of claim 7, wherein determining the first maximum current value and the first minimum current value corresponding to the photochromic plate according to the first gray value of the first small photochromic plate in the test gray picture and the corresponding relationship between the standard gray value and the standard current value comprises:
respectively calculating the gray value difference between the second maximum gray value and the first gray value of each first small color changing plate;
respectively calculating the product of the gray value difference of each first small color-changing plate and the second ratio to obtain a current change value;
respectively calculating the difference value between the second maximum current value and the current change value of each first small color changing plate to obtain a first current value corresponding to each first small color changing plate;
determining the first maximum current value and the first minimum current value of the photochromic plate among the first current values.
9. A photochromic plate for use in the solar simulator non-uniformity detection method of any one of claims 1 to 8.
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Effective date of registration: 20221214 Address after: Room 1251-20, Logistics Technology Building, No. 1, Jima West Road, Wangdian Town, Xiuzhou District, Jiaxing City, Zhejiang Province 314000 Patentee after: Jiaxing Longji Photovoltaic Technology Co.,Ltd. Address before: No. 268, Xingtai South Road, Hailing District, Taizhou City, Jiangsu Province Patentee before: LONGI SOLAR TECHNOLOGY (TAIZHOU) Co.,Ltd. |