Ultraviolet attenuation test method for photovoltaic module

Abstract

The invention discloses a method for testing ultraviolet attenuation of a photovoltaic module, which relates to the technical field of performance testing of the photovoltaic module and is characterized in that the ultraviolet stability of the photovoltaic module is evaluated through three steps of sample preparation, ultraviolet testing and data processing. The method comprises the following steps: firstly, selecting a control assembly and a tested sample assembly, and carrying out initial appearance and electrical performance test and electroluminescence EL test; then, the sample assembly is placed under an ultraviolet light source to be subjected to an aging test, and power attenuation is recorded; finally, the performance of the photovoltaic module is judged by calculating the power attenuation value after the ultraviolet test, so that the anti-ultraviolet performance of the battery in the tested sample module is evaluated. The test method aims to evaluate the power attenuation of the photovoltaic module under ultraviolet irradiation through laboratory test, so that the battery module with excellent ultraviolet resistance is screened, the outdoor ultraviolet attenuation risk of the module is reduced, and the long-term reliability of the module is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaic module performance testing, and in particular relates to a photovoltaic module ultraviolet attenuation testing method. Background Art

[0002] With the continuous advancement of photovoltaic technology, new high-efficiency cell technologies such as TOPCon cells are widely used. However, while these new cell technologies improve efficiency, they also face new challenges, especially the degradation caused by ultraviolet light. Ultraviolet degradation (UVID) has a significant impact on the first-year and annual degradation of photovoltaic modules, which poses new challenges to the quality and reliability of modules.

[0003] UV degradation mainly affects the first-year and annual degradation of photovoltaic modules, especially the impact on n-type silicon solar cell modules is more significant. Studies have shown that modern solar cell architectures, including n-type modules, are more sensitive to UVID. UV exposure can cause light-induced degradation, spectral response changes and irradiation damage to n-type silicon solar cells, affecting their electrical performance and efficiency.

[0004] Traditional UV pretreatment tests cannot fully evaluate the ability of new photovoltaic modules to resist UV degradation. Therefore, more advanced testing methods are needed to evaluate the ability of new photovoltaic modules to resist UV degradation. Summary of the invention

[0005] The purpose of the present invention is to provide a method for testing UV attenuation of photovoltaic modules, which aims to evaluate the UV resistance of batteries through laboratory tests, thereby screening batteries with excellent UV resistance and reducing the risk of outdoor UV attenuation of modules.

[0006] To achieve the above object, the present invention provides the following scheme: a method for testing ultraviolet attenuation of photovoltaic modules, comprising the following steps:

[0007] Step S1, sample preparation, including: randomly selecting one control component from a number of photovoltaic components to be tested that have the same material matching, and randomly selecting two components as the sample components to be tested; performing an initial appearance inspection, an initial electrical performance test, and an initial electroluminescence EL test on the control component and the sample components to be tested, and recording the results as G n-1 , P n-1 ,EL n-1 ;

[0008] Step S2, UV test, including: performing a UV aging test on the sample component under the first irradiance condition, and then performing a second electrical performance test on the sample component to obtain the power P after the first UV test. n According to P n and P n-1Get the power attenuation ΔP of the sample component under test, and do corresponding processing according to the size of the power attenuation:

[0009] If the power attenuation ΔP is less than 1%, the test is terminated;

[0010] If the power attenuation ΔP exceeds 1%, the UV aging test under the second irradiance condition is carried out. When the power attenuation ΔP ≤ ± 0.5%, the test is terminated. When the power attenuation ΔP > ± 0.5%, the UV aging test under the second irradiance condition is repeated until the power attenuation ΔP ≤ ± 0.5%;

[0011] Carry out post-ultraviolet appearance inspection, post-ultraviolet electrical performance test, and post-ultraviolet electroluminescence EL test on the sample components after the UV test, and carry out post-ultraviolet electrical performance test on the control components, and record the results as G2, P2, and EL2 respectively;

[0012] Step S3, data processing, including: calculating the power attenuation value ΔP of the test sample component after the UV test t And control component power attenuation value ΔP c ; By ΔP t and ΔP c The difference is calculated to obtain the UV power attenuation result ΔP of the photovoltaic module to be tested. UVID ; According to ΔP UVID The value of is used to judge the performance of the sample component under test.

[0013] In an optional embodiment, in step S2, the UV aging test includes: placing the front of any one of the two sample components to be tested facing the UV light source, and the back of the other sample component to be tested facing the UV light source, and the UV light source vertically irradiates the surfaces of the two sample components to be tested; connecting the sample components to the load so that the sample components to be tested are at the maximum power point; and then performing the UV aging test on the sample components to be tested under preset irradiance conditions.

[0014] In an optional embodiment, the first irradiance condition is 60 kWh / m 2 The second irradiance condition is 30kWh / m 2 of ultraviolet radiation.

[0015] In an optional implementation, the power attenuation ΔP is calculated as follows:

[0016] In an optional embodiment, the UV power attenuation result ΔP UVID The calculation formula is:

[0017] In the formula, ΔPt Represents the power attenuation value of the test sample after UV test, ΔP c Represents the power attenuation value of the control component, P t0 Represents the initial power of the sample component under test, P tn Represents the power of the sample component after the UV test, P c0 Represents the initial power of the control component, P cn Represents the second power of the control component.

[0018] In an optional embodiment, the performance judgment criteria of the sample component under test are:

[0019] ΔP UVID ≤1% was considered excellent;

[0020] 1%<ΔP UVID ≤2% is considered good;

[0021] ΔP UVID >2% was judged as poor.

[0022] In an optional embodiment, in the process of determining the performance of the sample component under test, the data of the sample component under test illuminated from the front side is used as the basis, and the data of the sample component under test illuminated from the back side is used as a reference.

[0023] The present invention has the following technical effects: The present invention provides a more accurate method for testing and evaluating the ultraviolet induced attenuation of photovoltaic cells, which aims to evaluate the power attenuation of photovoltaic modules under ultraviolet irradiation through laboratory tests, effectively evaluate the anti-ultraviolet performance of the cells, thereby screening cells with excellent anti-ultraviolet performance, and reducing the risk of outdoor ultraviolet attenuation of photovoltaic modules to ensure their long-term reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 This is a flow chart of the UV attenuation testing method for photovoltaic modules of the present invention;

[0026] Figure 2 The present invention is a flow chart of the ultraviolet test in the ultraviolet attenuation test method of the photovoltaic module. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Reference Figure 1 As shown, the present invention provides a method for testing ultraviolet attenuation of photovoltaic modules, comprising the following steps:

[0030] Step S1, sample preparation;

[0031] Step S2, UV test;

[0032] Step S3: data processing.

[0033] The step S1, sample preparation, comprises the following steps:

[0034] Step S101, randomly selecting one of a number of photovoltaic modules to be tested that have the same material as the control module, and randomly selecting two of them as the sample modules to be tested;

[0035] Step S102: Perform an initial visual inspection on the control component and the sample component to be tested, and record the visual inspection results as G. n-1 ;

[0036] The control component and the sample component under test are subjected to initial electrical performance test under STC conditions, and the test results are recorded as P n-1 ;

[0037] The control component and the sample component under test are subjected to an initial electroluminescence EL test, and the test results are recorded as EL n-1 .

[0038] Reference Figure 2 As shown, the step S2, UV test, includes the following steps:

[0039] Step S201, any one of the two sample components to be tested is facing the front side of the ultraviolet light source, and the other sample component to be tested is facing the back side of the ultraviolet light source, and the ultraviolet light source is vertically irradiated on the surfaces of the two sample components to be tested;

[0040] Step S202, connecting the sample component to be tested to a load so that the sample component to be tested is at a maximum power point;

[0041] Step S203: Perform a UV aging test on the sample module under the first irradiance condition, and after the test, perform a second electrical performance test on the photovoltaic module under the STC condition, and record the test result as P n ;

[0042] In this embodiment, the first irradiance condition is 60 kWh / m 2 UV radiation;

[0043] Step S204: According to P n and P n-1 Get the power attenuation ΔP of the sample component under test, and do corresponding processing according to the size of the power attenuation:

[0044] If the power attenuation ΔP is less than 1%, the test is terminated;

[0045] If the power attenuation ΔP exceeds 1%, the UV aging test under the second irradiance condition is carried out. When the power attenuation ΔP ≤ ± 0.5%, the test is terminated. When the power attenuation ΔP > ± 0.5%, the UV aging test under the second irradiance condition is repeated until the power attenuation ΔP ≤ ± 0.5%;

[0046] In this embodiment, the second irradiance condition is 30 kWh / m 2 UV radiation;

[0047] Among them, the power attenuation

[0048] Where P n Represents the power after the nth UV test, P n-1 represents the power after the n-1th UV test;

[0049] Step S205, performing post-ultraviolet testing, specifically comprising:

[0050] Conduct a post-ultraviolet appearance inspection on the sample component under test, and record the visual inspection result as G2;

[0051] Performing a post-ultraviolet electrical performance test on the control component and the sample component under STC conditions, and recording the test results as P2;

[0052] Performing a post-ultraviolet electroluminescence (EL) test on the sample component under test, and recording the test result as EL2;

[0053] The step S3, data processing, comprises the following steps:

[0054] Calculate the power attenuation value ΔP of the test sample component after UV test t And control component power attenuation value ΔP c , by ΔP tand ΔP c The difference is calculated to obtain the UV power attenuation result ΔP of the photovoltaic module to be tested. UVID ;

[0055] ΔP UVID =ΔP t -ΔP c ;

[0056]

[0057] In the formula, ΔP t Represents the power attenuation value of the test sample after UV test, ΔP c Represents the power attenuation value of the control component, P t0 Represents the initial power of the sample component under test, P tn Represents the power of the sample component after the UV test, P c0 Represents the initial power of the control component, P cn Represents the second power of the control component;

[0058] In the process of judging the performance of the sample component under test, the data of the sample component under front irradiation shall prevail, and the data of the sample component under back irradiation shall be used for reference only;

[0059] ΔP UVID ≤1% was considered excellent;

[0060] 1%<ΔP UVID ≤2% is considered good;

[0061] ΔP UVID >2% was judged as poor.

[0062] Compared with the prior art, the testing method of the above embodiment has at least the following beneficial effects:

[0063] 1. Evaluation of anti-ultraviolet performance: Through laboratory tests, the anti-ultraviolet performance of photovoltaic cells can be effectively evaluated, and cells with excellent anti-ultraviolet performance can be screened out.

[0064] 2. Reduce the risk of outdoor attenuation: By evaluating the anti-UV performance, the risk of power attenuation caused by UV radiation in outdoor photovoltaic modules can be reduced.

[0065] 3. Accurate power attenuation calculation: The power attenuation value after UV test is calculated using an accurate formula, providing a more accurate testing method.

[0066] 4. Performance judgment standard: According to the ultraviolet power attenuation result ΔPUVID, a clear performance judgment standard is set, which provides a basis for the quality control of photovoltaic modules.

[0067] 5. Improve product reliability: Through testing and screening, improve the quality and reliability of photovoltaic modules and extend their service life.

[0068] 6. Optimized UV pretreatment test: The traditional UV pretreatment test has been improved to enable it to more effectively evaluate the component's ability to resist UV attenuation.

[0069] The details not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0070] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0071] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for testing ultraviolet attenuation of photovoltaic modules, characterized in that: The following steps are involved: Step S1, sample preparation, including: randomly selecting one control component from a number of photovoltaic components to be tested that have the same material matching, and randomly selecting two components as the sample components to be tested; performing an initial appearance inspection, an initial electrical performance test, and an initial electroluminescence EL test on the control component and the sample components to be tested, and recording the results as G n-1 , P n-1 ,EL n-1 ; Step S2, UV test, including: performing a UV aging test on the sample component under the first irradiance condition, and then performing a second electrical performance test on the sample component to obtain the power P after the first UV test. n According to P n and P n-1 Get the power attenuation ΔP of the sample component under test, and do corresponding processing according to the size of the power attenuation: If the power attenuation ΔP is less than 1%, the test is terminated; If the power attenuation ΔP exceeds 1%, the UV aging test under the second irradiance condition is carried out. When the power attenuation ΔP ≤ ± 0.5%, the test is terminated. When the power attenuation ΔP > ± 0.5%, the UV aging test under the second irradiance condition is repeated until the power attenuation ΔP ≤ ± 0.5%; Carry out post-ultraviolet appearance inspection, post-ultraviolet electrical performance test, and post-ultraviolet electroluminescence EL test on the sample components after the UV test, and carry out post-ultraviolet electrical performance test on the control components, and record the results as G2, P2, and EL2 respectively; Step S3, data processing, including: calculating the power attenuation value ΔP of the test sample component after the UV test t And control component power attenuation value ΔP c ; By ΔP t and ΔP c The difference is calculated to obtain the UV power attenuation result ΔP of the photovoltaic module to be tested. UVID ; According to ΔP UVID The value of is used to judge the performance of the sample component under test.

2. The method for testing the ultraviolet attenuation of photovoltaic modules according to claim 1, characterized in that: In step S2, the UV aging test includes: placing the front of any one of the two sample components to be tested facing the UV light source, and the back of the other sample component to be tested facing the UV light source, and the UV light source vertically irradiates the surfaces of the two sample components to be tested; connecting the sample components to the load so that the sample components to be tested are at the maximum power point; and then performing the UV aging test on the sample components to be tested under preset irradiance conditions.

3. The method for testing the ultraviolet attenuation of photovoltaic modules according to claim 1, characterized in that: The first irradiance condition is 60kWh / m 2 The second irradiance condition is 30kWh / m 2 of ultraviolet radiation.

4. The method for testing the ultraviolet attenuation of photovoltaic modules according to claim 1, characterized in that: The calculation formula of power attenuation ΔP is:

5. The method for testing the ultraviolet attenuation of photovoltaic modules according to claim 1, characterized in that: UV power attenuation result ΔP UVID The calculation formula is: In the formula, ΔP t Represents the power attenuation value of the test sample after UV test, ΔP c Represents the power attenuation value of the control component, P t0 Represents the initial power of the sample component under test, P tn Represents the power of the sample component after the UV test, P c0 Represents the initial power of the control component, P cn Represents the second power of the control component.

6. The method for testing ultraviolet attenuation of photovoltaic modules according to claim 1, characterized in that: The performance criteria for the tested sample components are: ΔP UVID ≤1% was considered excellent; 1%<ΔP UVID ≤2% is considered good; ΔP UVID >2% was judged as poor.

7. The method for testing the ultraviolet attenuation of photovoltaic modules according to claim 2, characterized in that: In the process of judging the performance of the sample component under test, the data of the sample component under test illuminated from the front side shall prevail, and the data of the sample component under test illuminated from the back side shall be used as a reference.

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