CN212811638U - Double-sided photovoltaic cell testing device - Google Patents
Double-sided photovoltaic cell testing device Download PDFInfo
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- CN212811638U CN212811638U CN202021480353.3U CN202021480353U CN212811638U CN 212811638 U CN212811638 U CN 212811638U CN 202021480353 U CN202021480353 U CN 202021480353U CN 212811638 U CN212811638 U CN 212811638U
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Abstract
The utility model discloses a double-sided photovoltaic cell testing device, which comprises a solar simulator, a testing power supply, a battery bracket, a mirror reflection plate, a reflection cover and a darkroom, wherein the battery bracket is used for mounting a double-sided photovoltaic cell and is connected with the testing power supply; the solar simulator is positioned right in front of the front side of the double-sided photovoltaic cell, the mirror reflection plate is arranged behind the double-sided photovoltaic cell, and part of radiation of the solar simulator is collected and reflected into the reflection cover; the reflector is arranged right behind the back of the double-sided photovoltaic cell, and the inner surface of the reflector is parabolic. The utility model discloses make two-sided photovoltaic cell receive the radiation of light simultaneously on the front and back sides when the test, measure two-sided photovoltaic cell's whole electrical property, eliminated two steps of test fitting and caused the deviation of test result.
Description
Technical Field
The utility model belongs to the technical field of photovoltaic cell power test technique and specifically relates to a two-sided photovoltaic cell testing arrangement is related to.
Background
Along with the gradual approach of the flat price on-line, high-efficiency power generation technologies such as double-sided photovoltaic cells and the like are gradually started. Due to the power generation characteristics of the bifacial photovoltaic cell, there is output from both the front and back sides. The existing method can only measure the single-side power of the photovoltaic cell once when testing the photovoltaic cell, and can only measure one side of the photovoltaic cell every time when testing the double-side photovoltaic cell, and the measurement needs to be carried out twice, then the total output power of the double-side photovoltaic cell is calculated through formula fitting, and the test result has certain deviation with the actual output power of the double-side photovoltaic cell.
How to accurately calibrate the power of the double-sided photovoltaic cell becomes a current difficulty, which causes great divergence in power calibration of buyers and sellers, and restricts the commercialization route of the product; in addition, the final nominal value of the power of the double-sided photovoltaic cell directly influences the system design of a terminal power station, and serious fire hazards and the like can be caused due to improper design. In the actual power generation of the bifacial photovoltaic cell, the irradiance of the back surface cannot reach the intensity in the standard state. And because of the weak light effect of the silicon material battery, the power of the photovoltaic battery does not change linearly with the light intensity, so the power of the double-sided photovoltaic battery measured by the measuring method has a certain error with the actual work of the double-sided photovoltaic battery. Therefore, how to provide a test method for improving the power accuracy of the double-sided photovoltaic cell becomes a problem to be solved urgently in the field.
Disclosure of Invention
An object of the utility model is to provide a two-sided photovoltaic cell testing arrangement to rectify the error that two-sided photovoltaic cell power caused to two-sided photovoltaic cell test result along with the light intensity nonlinear variation.
The purpose of the utility model is realized like this:
a double-sided photovoltaic cell testing device is characterized in that: the solar simulator is arranged in the middle of the inner wall of the left side plate of the darkroom, the reflecting cover is arranged in the middle of the inner wall of the right side plate of the darkroom and is opposite to the solar simulator, the battery bracket for placing the double-sided photovoltaic battery is arranged in the middle of the darkroom and between the solar simulator and the reflecting cover, the test power supply is connected with the battery bracket through a lead, and the center of the reflecting cover, the center of the double-sided photovoltaic battery and the center of the solar simulator are on the same straight line, so that the back and the front of the double-sided photovoltaic battery are uniformly radiated by the solar simulator; one ends of two mirror reflection plates with completely same structures and symmetrically arranged are respectively hinged in the middle of the inner walls of the front side plate and the rear side plate of the darkroom between the battery bracket and the reflection cover, the other ends of the two mirror reflection plates extend to the middle, the two mirror reflection plates respectively form acute angles with the included angles of the front side plate and the rear side plate of the darkroom, and the reflection surfaces face the solar simulator.
The angle between the mirror reflection plate and the front side plate and the angle between the mirror reflection plate and the back side plate of the darkroom can be changed, the angle of the reflection light of the mirror reflection plate is changed by changing the angle between the mirror reflection plate and the front side plate and the back side plate of the darkroom, so that the radiant quantity of the solar simulator is controlled and collected and reflected to the reflection cover, and the angle control range is 0-30 degrees.
The inner surface of the reflector is parabolic, and the reflector vertically reflects incident light passing through a parabolic focus to the back of the double-sided photovoltaic cell; the inner surface of the reflector below the parabolic focus is smooth, the inner surface of the reflector above the parabolic focus is rough, and the focal length is as large as possible to improve the uniformity of the reflected light.
The bottom of the support rod of the battery support is provided with a roller with a stop switch, so that the battery support can move to fix the double-sided photovoltaic module in a darkroom as required.
The double-sided photovoltaic cell is a double-sided photovoltaic assembly or a double-sided cell piece.
The test power supply is used for testing the whole electrical parameters of the double-sided photovoltaic cell. The darkroom provides a dark environment for the test.
The mirror reflection plate is replaceable, the irradiance on the back of the double-sided photovoltaic cell can have certain difference according to different installation backgrounds in practical application, the standard is established according to TuV, and the relation between the back reflection coefficient and the installation background is shown in the following table 1. Therefore, the irradiance reflected to the reflector is controlled by replacing the specular reflection plates with different reflectivities, so that the irradiance on the back of the double-sided photovoltaic cell is regulated and controlled.
TABLE 1 Back reflection coefficient vs. installation background
| Reflection coefficient R | Installation background |
| 10% | Installation background with reflectivity less than 35% such as soil, sand, gravel, water surface, grassland, cement land and the like |
| 20% | Aluminum foil, light-colored ground surface, etc. with a reflectivity of 35% -75%. |
| 30% | Snow, white background, etc. with a reflectance of more than 75%. |
In addition, the irradiance of the back of the double-sided photovoltaic cell can also be controlled by the angle between the specular reflection plate and the front side plate and the back side plate of the darkroom. When the adjustment is combined with the replacement of the specular reflection plate, the conversion of the emission coefficient from 0 to 30 percent can be realized, and preferably, the angle between the specular reflection plate and the front side plate and the rear side plate of the darkroom is adjusted to change the angle of the reflected light of the specular reflection plate, so that the reflected light can reach the focus of the parabola of the reflector as far as possible.
The utility model discloses the interference of other light sources should be avoided during the test, except that other materials of specular reflection board and bowl should be blackened, whole environment is arranged in the darkroom to reduce the interference of parasitic light, improve the stability and the accuracy of test result.
During testing, part of radiation of the solar simulator is directly radiated to the front side of the double-sided photovoltaic cell; a portion of the radiation strikes the specular reflector and is reflected into the reflector, which reflects the collected radiation to the back side of the bifacial photovoltaic cell (as shown in fig. 2), so that the front and back sides of the bifacial photovoltaic module are simultaneously irradiated by the solar simulator. Therefore, the method can simultaneously and accurately measure the I-V curve of the double-sided photovoltaic cell under the condition of adopting a single solar simulator, thereby eliminating the test deviation caused by the difference between the test environment and the actual operation environment of the double-sided photovoltaic cell to the maximum extent.
Therefore, the utility model discloses make two-sided photovoltaic cell when the test openly, the back both sides receive the radiation of light simultaneously, can be accurate, measure two-sided photovoltaic cell's whole electrical property conveniently to rectify the error that two-sided photovoltaic cell power led to the fact two-sided photovoltaic cell test result along with the light intensity nonlinear variation, realized that the two-sided photovoltaic cell of simultaneous measurement openly, the holistic electrical property in the back, eliminated two steps of test fitting and caused the deviation of test result.
Drawings
FIG. 1 is a schematic view of the present invention;
and (3) identifying the figure number: 1. the device comprises a solar simulator, 2, a test power supply, 3, a mirror reflector, 4, a reflector, 5, a battery bracket, 6, a darkroom, 7 and a lead;
fig. 2 is a top view of the optical path diagram of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the drawings of the present invention all adopt very simplified non-precise proportions, and are only used for convenient and clear auxiliary explanation of the present invention.
Example 1:
the embodiment is a testing device for testing a double-sided photovoltaic module, as shown in fig. 1, the testing device comprises a solar simulator 1, a testing power supply 2, a mirror reflector 3, a reflector 4, a battery support 5, a darkroom 6 and a lead 7, wherein the solar simulator 1 is arranged in the middle of the inner wall of the left side plate of the darkroom 6, the reflector 4 with a parabolic inner surface is arranged in the middle of the inner wall of the right side plate of the darkroom 6 and opposite to the solar simulator 1, the battery support 5 for placing the double-sided photovoltaic module is arranged in the middle of the darkroom 6 and between the solar simulator 1 and the reflector 4, the testing power supply 2 is connected with the battery support 5 through the lead 7, the center of the reflector 4, the center of the double-sided photovoltaic module and the center of the solar simulator 1 are on the same straight line, so that the radiation of the back side and the front side of the double-sided photovoltaic module is uniform, and the double-sided photovoltaic module with different sizes is fixed by moving without shielding the back side and the front side Radiation of the solar simulator of (1); the one end of two mirror reflector 3 that the structure is the same completely, the symmetry is placed articulates respectively in the middle of the inner wall of darkroom 6 front side board, posterior lateral plate between battery stand 5 and bowl 4, and the other end of two mirror reflector 3 stretches to the centre, and two mirror reflector 3 are acute angle and plane of reflection respectively with the preceding lateral plate of darkroom 6, the contained angle of posterior lateral plate and face of reflection towards solar simulator 1.
The bottom of the support rod of the battery support 5 is provided with a roller with a stop switch, so that the battery support 5 can move as required in the darkroom 6, and the battery support 5 does not shield the light of the solar simulator 1 radiated to the double-sided photovoltaic battery.
The inner surface of the reflector 4 is parabolic, and the reflector 4 vertically reflects incident light passing through a parabolic focus to the back of the double-sided photovoltaic cell; the inner surface of the reflector 4 below the parabolic focus is smooth, the inner surface of the reflector above the parabolic focus is rough, and the focal length is as large as possible to improve the uniformity of the reflected light.
The angle between the mirror reflection plate 3 and the front side plate and the rear side plate of the darkroom 6 can be changed, the angle of the reflected light of the mirror reflection plate 3 is changed by changing the angle between the mirror reflection plate 3 and the front side plate and the rear side plate of the darkroom 6, so that the radiant quantity of the solar simulator 1 is controlled and collected and reflected to the reflection cover 4, and the angle change range is 0-30 degrees.
During testing, the double-sided photovoltaic module (195.6 cm × 99.2 cm) is vertically placed on the battery support 5, the distance between the battery support 5 and the solar simulator 1 is 300cm, and the width and the height of the battery support 5 are 100cm and 200cm respectively; the two specular reflection plates 3 are arranged behind two sides of the double-sided photovoltaic module and are equal in size, and the width and the height of each specular reflection plate are 100cm and 200cm respectively; the reflector 4 is arranged right behind the double-sided photovoltaic module, the parabolic focal length of the reflector 4 is 50cm, the size radius of a port of the reflector 4 is 100cm, and the distance between the parabolic bottom of the reflector 4 and the double-sided photovoltaic module is 300 cm.
In the standard test, the front irradiance of the double-sided battery is 1000W/m2. Since most of the double-sided photovoltaic module is installed in the soil, the reflection coefficient is 10% in this embodiment, that is, the irradiance on the back of the double-sided photovoltaic module is 100W/m2And adjusting the angle of the specular reflection plate with 50% of calibrated reflectivity to 7 degrees between the specular reflection plate and the front side plate and the rear side plate of the darkroom 6 to ensure that the irradiance received by the back of the double-sided photovoltaic module is 100W/m2。
During testing, the double-sided photovoltaic module is fixed on the battery bracket 5 and the lead port is connected with the testing power supply 2, so that the center of the reflecting cover 4, the center of the double-sided photovoltaic module and the center of the solar simulator 1 are on the same straight line; the testing power supply 2 is turned on, and the front side of the double-sided photovoltaic module receives radiation of the solar simulator 1; at the same time, the back of the bifacial photovoltaic module receives radiation reflected by the reflector 4. The method can simultaneously and accurately measure the I-V curve of the double-sided photovoltaic module, thereby solving the problem of test errors caused by the difference between the test environment and the actual application environment of the double-sided photovoltaic cell to the maximum extent.
Example 2:
the embodiment is a testing device for testing a double-sided battery piece, as shown in fig. 1, and the testing device comprises a solar simulator 1, a testing power supply 2, a mirror reflector 3, a reflector 4, a battery support 5, a darkroom 6 and a lead 7, wherein the solar simulator 1 is arranged in the middle of the inner wall of the left side plate of the darkroom 6, the reflector 4 with a parabolic inner surface is arranged in the middle of the inner wall of the right side plate of the darkroom 6 and opposite to the solar simulator 1, the battery support 5 for placing the double-sided battery piece is arranged in the middle of the darkroom 6 and between the solar simulator 1 and the reflector 4, the testing power supply 2 is connected with the battery support 5 through the lead 7, the center of the reflector 4, the center of the double-sided battery piece and the center of the solar simulator 1 are on the same straight line, so that the radiation of the back and the front of the double-sided battery piece is uniform, and the double-sided battery piece with different sizes is fixed by moving and does not shield a solar module from the back and the front of Radiation of the simulator; the one end of two mirror reflector 3 that the structure is the same completely, the symmetry is placed articulates respectively in the middle of the inner wall of darkroom 6 front side board, posterior lateral plate between battery stand 5 and bowl 4, and the other end of two mirror reflector 3 stretches to the centre, and two mirror reflector 3 are acute angle and plane of reflection respectively with the preceding lateral plate of darkroom 6, the contained angle of posterior lateral plate and face of reflection towards solar simulator 1.
The bottom end of the support rod of the battery support 5 is provided with a roller with a stop switch, so that the battery support 5 can move as required in the darkroom 6, and the battery support 5 does not shield the light radiated by the solar simulator 1 to the double-sided battery piece.
The inner surface of the reflector 4 is parabolic, and the reflector 4 vertically reflects incident light passing through a parabolic focus to the back of the double-sided photovoltaic cell; the inner surface of the reflector 4 below the parabolic focus is smooth, the inner surface of the reflector above the parabolic focus is rough, and the focal length is as large as possible to improve the uniformity of the reflected light.
The angle between the mirror reflection plate 3 and the front side plate and the rear side plate of the darkroom 6 can be changed, the angle of the reflected light of the mirror reflection plate 3 is changed by changing the angle between the mirror reflection plate 3 and the front side plate and the rear side plate of the darkroom 6, so that the radiant quantity of the solar simulator 1 is controlled and collected and reflected to the reflection cover 4, and the angle change range is 0-30 degrees.
In the testing process, double-sided battery pieces (15.6 cm x 15.6 cm) are placed on a battery support 5, the distance between the battery support 5 and the solar simulator 1 is 30cm, the width and the height of the battery support 5 are respectively 20cm and 20cm, the double-sided battery pieces are fixed by moving the battery support, and other parts in the battery support are shielded by using black cloth; the two mirror reflection plates 3 are arranged behind two sides of the double-sided cell piece and are equal in size, the width and the height of the two mirror reflection plates are respectively 20cm and 20cm, and the vertical distance between the center of each mirror reflection plate 3 and the solar simulator 1 is 35 cm; the reflector 4 is arranged right behind the double-sided cell piece, the focal length of the reflector 4 is 5cm, the size radius of a port of the reflector 4 is 10cm, and the distance between the parabolic bottom of the reflector 4 and the double-sided photovoltaic cell is 30 cm.
In the standard test, the front irradiance of the double-sided cell slice is 1000W/m2. The embodiment adopts the example that the reflection coefficient is 20 percent, namely the irradiance of the back surface of the double-sided battery piece is 200W/m2The mirror reflection plate 3 with the nominal reflectivity of 70 percent is used, and the angle of 7 degrees between the mirror reflection plate 3 and the front side plate and the rear side plate of the darkroom 6 is adjusted, so that the irradiance received by the back surface of the double-sided battery piece is 200W/m2。
During testing, the center of the reflecting cover 4, the center of the double-sided cell and the center of the solar simulator 1 are on the same straight line; and (5) turning on the test power supply 2 to measure the overall electrical performance of the double-sided battery piece. The method can simultaneously and accurately measure the I-V curve of the double-sided battery piece, thereby solving the problem of test errors caused by the difference between the test environment and the actual application environment of the double-sided battery piece to the maximum extent.
The above-mentioned embodiments are only an implementation manner of the present invention, and not limited thereto, the protection scope of the present invention is not limited thereto, and those skilled in the art can still modify or replace the technical solutions described in the foregoing embodiments, and these modifications and replacements do not depart from the scope of the present invention, and all should be included in the protection scope of the present invention, which shall be subject to the protection scope of the present invention as set forth in the claims.
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| CN111865217A (en) * | 2020-07-24 | 2020-10-30 | 南昌大学 | A double-sided photovoltaic cell testing device |
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| CN111865217A (en) * | 2020-07-24 | 2020-10-30 | 南昌大学 | A double-sided photovoltaic cell testing device |
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