CN117294252A - Photovoltaic solder strip detection method and photovoltaic solder strip detection system - Google Patents
Photovoltaic solder strip detection method and photovoltaic solder strip detection system Download PDFInfo
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- CN117294252A CN117294252A CN202311214768.4A CN202311214768A CN117294252A CN 117294252 A CN117294252 A CN 117294252A CN 202311214768 A CN202311214768 A CN 202311214768A CN 117294252 A CN117294252 A CN 117294252A
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- 229910000679 solder Inorganic materials 0.000 title claims abstract description 177
- 238000001514 detection method Methods 0.000 title claims abstract description 42
- 230000005284 excitation Effects 0.000 claims description 48
- 238000000034 method Methods 0.000 claims description 16
- 238000012360 testing method Methods 0.000 claims description 11
- 238000004364 calculation method Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention relates to the technical field of photovoltaics, and particularly provides a photovoltaic solder strip detection method and a photovoltaic solder strip detection system. The photovoltaic solder strip detection method comprises the following steps: respectively obtaining a reference propagation speed of a current with a first set frequency in a standard photovoltaic solder strip and a measured propagation speed of a current with a second set frequency in a photovoltaic solder strip to be measured, wherein the first set frequency is equal to the second set frequency; and determining whether the conductivity of the photovoltaic solder strip to be tested is qualified or not according to the reference propagation speed and the measured propagation speed. The photovoltaic solder strip detection method can accurately judge whether the conductivity of the photovoltaic solder strip is qualified or not, and is not influenced by the cross section area of the photovoltaic solder strip. The detection method is adopted to determine the good photovoltaic solder strip, so that the quality of the good photovoltaic solder strip applied to the photovoltaic module can be guaranteed, and the power of the photovoltaic module is further guaranteed.
Description
Technical Field
The invention relates to the technical field of photovoltaics, in particular to a photovoltaic solder strip detection method and a photovoltaic solder strip detection system.
Background
In recent years, environmental pollution and energy shortage have become the focus of world attention, and in order to solve global energy crisis and environmental deterioration problems, it is urgent to find sustainable green energy. Solar energy is considered to be a key for solving the problems of energy shortage and environmental pollution due to the characteristics of high energy storage, wide distribution, reproducibility, no pollution and the like. The solar cell is used as an effective way for utilizing solar energy, the basic principle is that solar radiation energy is directly converted into electric energy by utilizing the photovoltaic effect, and the solar cell has the advantages of high conversion efficiency, low cost and the like, and has great potential in the aspects of new energy development and environmental protection.
The photovoltaic solder strip is usually a tin-plated copper strip and is used for connecting a plurality of solar cells, so that the important effects of conduction and electricity collection are exerted, the quality of the photovoltaic solder strip directly influences the collection effect of current in the photovoltaic module, and the power of the photovoltaic module is greatly affected. Therefore, in the production process, the photovoltaic solder strip is required to be detected so as to accurately judge whether the used photovoltaic solder strip meets the standard, and only the photovoltaic solder strip meeting the standard can be used for series welding assembly of the photovoltaic module, so that the quality of the photovoltaic module is ensured. In detecting the photovoltaic solder strip, one of the most important tests is the test of the conductivity of the photovoltaic solder strip.
The conventional photovoltaic solder strip conductivity test method comprises the following steps: applying voltage to two ends of the photovoltaic solder strip, obtaining a current value flowing through the photovoltaic solder strip, and calculating a resistance value R of the photovoltaic solder strip according to ohm's law; and measuring the length L and the cross section area S of the photovoltaic solder strip, and calculating to obtain the resistivity of the photovoltaic solder strip by using a formula rho=RS/L, so as to judge the conductivity of the photovoltaic solder strip. However, the photovoltaic solder strip is easy to be extruded and deformed, and the cross sectional areas of different positions are different, so that the cross sectional area brought in during calculation is inaccurate, the accuracy of a measurement result is low, and whether the conductivity of the photovoltaic solder strip meets the standard cannot be accurately judged. When the solder strip with the conductivity which does not meet the standard is used in the photovoltaic module, the collection effect of current in the photovoltaic module can be reduced, and the power of the photovoltaic module is affected.
Therefore, how to accurately determine whether the conductivity of the photovoltaic solder strip meets the standard needs to be solved.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is how to accurately judge whether the conductivity of the photovoltaic solder strip meets the standard, so as to provide a photovoltaic solder strip detection method and a photovoltaic solder strip detection system. The detection method is adopted to determine the good photovoltaic solder strip, so that the quality of the good photovoltaic solder strip applied to the photovoltaic module can be guaranteed, and the power of the photovoltaic module is further guaranteed.
The invention provides a photovoltaic solder strip detection method, which comprises the following steps: respectively obtaining a reference propagation speed of the current with the first set frequency in a standard photovoltaic solder strip and a measured propagation speed of the current with the second set frequency in the photovoltaic solder strip to be measured; and determining whether the conductivity of the photovoltaic solder strip to be tested is qualified or not according to the reference propagation speed and the measured propagation speed.
Optionally, the first set frequency is equal to the second set frequency, and when the measured propagation speed is greater than or equal to the reference propagation speed, the conductivity of the photovoltaic solder strip to be measured is determined to be qualified; and when the measured propagation speed is smaller than the reference propagation speed, determining that the conductivity of the photovoltaic solder strip to be measured is unqualified.
Optionally, the step of obtaining the propagation speed of the current in the photovoltaic solder strip includes: a first section and a second section are cut from the photovoltaic solder strip, and the length of the second section is greater than that of the first section; connecting the first segment with a first output end of an input excitation source and a first input end of an output receiver, connecting the second segment with a second output end of the input excitation source and a second input end of the output receiver, wherein the first output end of the input excitation source is suitable for outputting a first electric signal so as to enable the output receiver to display a first curve, and the second output end of the input excitation source is suitable for outputting a second electric signal so as to enable the output receiver to display a second curve, and the frequency of the first electric signal is the same as that of the second electric signal; controlling the input excitation source to simultaneously output a first electric signal and a second electric signal, and acquiring a first phase difference of the first curve and the second curve by the output receiver; calculating a first time difference delta T between the initial time of the output receiver displaying the first curve and the initial time of the output receiver displaying the second curve according to the first phase difference 1 The method comprises the steps of carrying out a first treatment on the surface of the Calculating a length difference deltas between the second segment and the first segment 1 From the first time difference DeltaT 1 The ratio is the propagation speed of the current in the photovoltaic solder strip.
Optionally, the photovoltaic solder strip detection method further includes: intercepting third to nth sections with different lengths from the photovoltaic solder strip, wherein the lengths of the third to nth sections are larger than the length of the first section and are not equal to the length of the second section, N is an integer larger than or equal to 3, and N is an integer larger than or equal to 3 and smaller than or equal to N; removing the second section, and connecting the nth section with the second output end of the input excitation source and the second input end of the output receiver; the input excitation source outputs a first electric signal and a second electric signal simultaneously, and obtains an n-1 time difference delta T between the initial time when the output receiver displays the first curve and the initial time when the output receiver displays the second curve n-1 The length difference between the nth section and the first section is delta S n-1 Sequentially obtain DeltaT 2 To DeltaT N-1 The method comprises the steps of carrying out a first treatment on the surface of the Coordinate point (DeltaT) 1 ,ΔS 1 ) To (DeltaT) N-1 ,ΔS N-1 ) Marking in a rectangular coordinate system, and fitting the coordinate points to form a straight line, wherein the slope of the straight line is the propagation speed of current in the photovoltaic solder strip; alternatively, ΔS is obtained 1 /ΔT 1 To DeltaS N-1 /ΔT N-1 The average value is the propagation speed of the current in the photovoltaic solder strip.
Optionally, N is 3-15.
Optionally, the lengths of the first segment to the nth segment form an arithmetic series.
Optionally, N is 5-7.
Optionally, the difference in length between the second section and the first section is 1 meter or more, and the length of the first section is 1 meter or more.
Optionally, the step of obtaining the propagation speed of the current in the photovoltaic solder strip includes: a first section and a second section are cut from the photovoltaic solder strip, and the length of the second section is greater than that of the first section; connecting the first segment to a first output of an input excitation source and a first input of an output receiver, and connecting the second segment to a second output of the input excitation source and a second input of the output receiver, the first output being adapted to output a first telecommunicationA number to cause the output receiver to display a first curve, the second output terminal adapted to output a second electrical signal to cause the output receiver to display a second curve; the input excitation source outputs a first electric signal and a second electric signal at the same time, and the frequency of the first electric signal is the same as that of the second electric signal; adjusting the output frequency of the input excitation source until the phase difference between the first curve and the second curve is 2pi, and the output frequency at this time is the first full-wave frequency f 1 The method comprises the steps of carrying out a first treatment on the surface of the The propagation speed of the current in the photovoltaic solder strip is the length difference delta L between the second section and the first section 1 With the first full wave frequency f 1 Is a product of (a) and (b).
Optionally, the photovoltaic solder strip detection method further includes: intercepting third to nth sections with different lengths from the photovoltaic solder strip, wherein the lengths of the third to nth sections are larger than the length of the first section and are not equal to the length of the second section, N is an integer larger than or equal to 3, and N is an integer larger than or equal to 3 and smaller than or equal to N; removing the second section, and connecting the nth section with the second output end of the input excitation source and the second input end of the output receiver; the input excitation source outputs a first electric signal and a second electric signal simultaneously, and adjusts the output frequency of the input excitation source to obtain an n-1 th full-wave frequency f n-1 The length difference between the nth section and the first section is delta L n-1 Sequentially obtain Δf 2 To Deltaf N-1 And DeltaL 2 To DeltaL N-1 The method comprises the steps of carrying out a first treatment on the surface of the Determining Δf 1 ×ΔL 1 To Deltaf N-1 ×ΔL N-1 The average value is the propagation speed of the current in the photovoltaic solder strip.
Optionally, N is 3-15;
optionally, N is 5-7.
Optionally, the input excitation source is a signal source, and the output receiver is an oscilloscope.
The invention also provides a photovoltaic solder strip detection system which is used for detecting a first section and a second section which are intercepted by the photovoltaic solder strip respectively, wherein the length of the second section is longer than that of the first section; the photovoltaic solder strip detection system comprises: an input excitation source for providing signal excitation, comprising a first output terminal and a second output terminal; the output receiver is used for receiving the test electric signals and displaying curves and comprises a first input end and a second input end; the first section is adapted to connect the first output and the first input, and the second section is adapted to connect the second output and the second input; the first output end is suitable for outputting a first electric signal so that the output receiver displays a first curve, the second output end is suitable for outputting a second electric signal so that the output receiver displays a second curve, and the frequency of the first electric signal is the same as that of the second electric signal; and the analysis and calculation module is suitable for calculating the propagation speed of the current in the photovoltaic solder strip at least according to the first curve and the second curve so as to judge whether the conductivity of the photovoltaic solder strip is qualified.
The technical scheme of the invention has the following advantages:
according to the photovoltaic solder strip detection method provided by the invention, the correlation between the propagation speed of the current in the medium and the conductivity of the medium is utilized, whether the conductivity of the photovoltaic solder strip is qualified or not is indirectly and accurately judged according to the propagation speed of the current in the standard photovoltaic solder strip and the propagation speed of the current in the photovoltaic solder strip to be detected, the influence of the cross section area of the photovoltaic solder strip is avoided, and whether the conductivity of the photovoltaic solder strip is qualified or not can be accurately judged even if the photovoltaic solder strip has a larger length. The detection method is adopted to determine the good photovoltaic solder strip, so that the quality of the good photovoltaic solder strip applied to the photovoltaic module can be guaranteed, and the power of the photovoltaic module is further guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a method for detecting a photovoltaic solder strip in an embodiment of the present invention;
FIG. 2 is a schematic diagram of the propagation speed of a test current in a photovoltaic solder strip according to an embodiment of the present invention;
reference numerals illustrate:
1-inputting an excitation source; a 2-output receiver; 3-a first stage; 4-second stage.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. In the description of the present invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Example 1
Referring to fig. 1, the embodiment provides a photovoltaic solder strip detection method, which includes:
s1, respectively obtaining a reference propagation speed of current with a first set frequency in a standard photovoltaic solder strip and a measured propagation speed of current with a second set frequency in the photovoltaic solder strip to be measured;
and S2, determining whether the conductivity of the photovoltaic solder strip to be tested is qualified or not according to the reference propagation speed and the measured propagation speed.
According to the photovoltaic solder strip detection method, the correlation between the propagation speed of the current in the medium and the conductivity of the medium is utilized, whether the conductivity of the photovoltaic solder strip is qualified or not is indirectly and accurately judged according to the propagation speed of the current in the standard photovoltaic solder strip and the propagation speed of the current in the photovoltaic solder strip to be detected, the influence of the cross section area of the photovoltaic solder strip is avoided, and whether the conductivity of the photovoltaic solder strip is qualified or not can be accurately judged even if the photovoltaic solder strip has a larger length.
Specifically, when the first set frequency is equal to the second set frequency, determining whether the conductivity of the photovoltaic solder strip to be tested is qualified by comparing the relative magnitudes of the measured propagation speed and the reference propagation speed: when the measured propagation speed is greater than or equal to the reference propagation speed, the conductivity of the photovoltaic solder strip to be measured is qualified; and when the measured propagation speed is smaller than the reference propagation speed, the conductivity of the photovoltaic solder strip to be measured is not qualified. When the first set frequency is not equal to the second set frequency, the measured propagation speed of the current with the second set frequency in the photovoltaic solder strip to be measured can be converted to obtain the propagation speed of the current with the first set frequency in the photovoltaic solder strip to be measured, and the converted measured propagation speed is compared with the reference propagation speed. It should be understood that the transmission rates of the currents with different frequencies in the same medium are different, so when comparing the measured propagation speed with the reference propagation speed, it is necessary to ensure that the measured propagation speed and the reference propagation speed are measured at the same current frequency, so as to accurately obtain the result of whether the conductivity of the photovoltaic solder strip to be measured is qualified.
In one embodiment, the step of obtaining the propagation speed of the current in the photovoltaic solder strip is:
s11, a first section and a second section are cut from the photovoltaic solder strip, and the length of the second section is larger than that of the first section;
step S12, referring to fig. 2, connecting the first segment 3 to a first output terminal of the input excitation source 1 and a first input terminal of the output receiver 2, and connecting the second segment 4 to a second output terminal of the input excitation source 1 and a second input terminal of the output receiver 2, where the first output terminal is adapted to output a first electrical signal to cause the output receiver 2 to display a first curve, and the second output terminal is adapted to output a second electrical signal to cause the output receiver 2 to display a second curve, and the frequency f of the first electrical signal is the same as the frequency f of the second electrical signal;
step S13, controlling the input excitation source 1 to simultaneously output a first electric signal and a second electric signal, and obtaining a first phase difference theta of the first curve and the second curve by the output receiver 2;
step S14, calculating the first phase difference theta to obtain the first phase difference shown by the output receiver 2A first time difference DeltaT between the initial moment of the curve and the initial moment of the second curve 1 Specifically, the first time difference DeltaT 1 ＝θ/(2πf)；
Step S15, calculating the length difference delta S between the second section and the first section 1 From the first time difference DeltaT 1 Ratio of (S), the ratio delta S 1 /ΔT 1 The propagation speed of the current in the photovoltaic solder strip is obtained.
The first section and the second section are intercepted from the standard photovoltaic solder strip and calculated by adopting the steps, so that the reference propagation speed can be obtained; and intercepting the first section and the second section from the photovoltaic solder strip to be measured, and calculating by adopting the steps, so that the measured propagation speed can be obtained. When the first set frequency is equal to the second set frequency, the first electrical signal is at the same frequency and the second electrical signal is at the same frequency in the process of acquiring the measured propagation speed and the reference propagation speed.
Specifically, the difference in length Δs between the second section and the first section 1 And the length of the first section is greater than or equal to 1 meter. Due to the fast propagation speed of the current, the current is obtained by the length difference delta S between the second section and the first section 1 And the length of the first section is limited, which is more beneficial to obtaining accurate time difference delta T 1 Thereby facilitating an improvement in the accuracy of the calculated propagation speed of the current.
It should be noted that, in order to improve the accuracy of the test result, the cross-sectional areas of the photovoltaic solder strip at different positions are generally measured in the conventional photovoltaic solder strip conductivity test process, then the average cross-sectional area is calculated, the average cross-sectional area is put into a formula to calculate the resistivity of the photovoltaic solder strip, and the resistivity of the photovoltaic solder strip is compared with the resistivity of a standard photovoltaic solder strip to determine whether the conductivity of the photovoltaic solder strip is qualified. Under the general condition, more than 10 test points of the photovoltaic solder strip with the length of 1 meter are needed, and the time required for measuring the cross section area of each test point is 2-3 minutes, so that the time required for measuring the photovoltaic solder strip with the length of 1 meter is about 30 minutes, and the longer the length of the photovoltaic solder strip, the longer the measurement time. The photovoltaic solder strip detection method provided by the embodiment of the invention has the advantages that the time for acquiring the propagation speed of the current in the photovoltaic solder strip is 1-2 minutes, the reference propagation speed or the measured propagation speed can be quickly acquired, whether the conductivity of the photovoltaic solder strip is qualified or not can be quickly judged, the measurement time is not influenced by the length of the photovoltaic solder strip, and the measurement time is effectively shortened.
It should also be noted that the first section 3 and the second section 4 illustrated in fig. 2 focus on illustrating the difference in length between them, and not on defining the shape of both.
Preferably, the photovoltaic solder strip detection method further comprises the following steps:
s16, intercepting third sections to Nth sections with different lengths from the photovoltaic solder strip, wherein the lengths of the third sections to the Nth sections are all larger than that of the first section and are not equal to that of the second section, N is an integer larger than or equal to 3, and N is an integer larger than or equal to 3 and smaller than or equal to N;
step S17, removing the second section, and connecting an nth section with the second output end of the input excitation source 1 and the second input end of the output receiver 2; the input excitation source 1 outputs a first electric signal and a second electric signal simultaneously, and an n-1 phase difference between a first curve and a second curve in the output receiver 2 is obtained; calculating an n-1 time difference DeltaT between an initial time when the output receiver 2 displays the first curve and an initial time when the output receiver 2 displays the second curve based on the n-1 phase difference n-1 The length difference between the nth section and the first section is delta S n-1 The method comprises the steps of carrying out a first treatment on the surface of the Sequentially obtain DeltaT 2 To DeltaT N-1 . In the whole process of detecting the photovoltaic solder strip, the frequencies of the first electric signal and the second electric signal are kept unchanged, and the frequencies of the first electric signal and the second electric signal are the same;
step S18, coordinate point (DeltaT 1 ,ΔS 1 ) To (DeltaT) N-1 ,ΔS N-1 ) Marked in rectangular coordinate system, deltaS N-1 Is the length difference between the N-th section and the first section, delta T N-1 Is equal to delta S N-1 Fitting the coordinate points to a straight line according to the corresponding N-1 time difference, wherein the slope of the straight line is the propagation speed of current in the photovoltaic solder strip; alternatively, ΔS is obtained 1 /ΔT 1 To DeltaS N-1 /ΔT N-1 The average value is the propagation speed of the current in the photovoltaic solder strip. The above steps can be performed when the propagation speed of the current in the standard photovoltaic solder strip and the propagation speed in the photovoltaic solder strip to be tested are obtained. The above steps can further improve the accuracy of the calculated propagation speed of the current. Since error points can be removed by adopting a coordinate point fitting mode, the propagation speed of current in the photovoltaic solder strip is preferably obtained by adopting a coordinate point fitting mode.
Specifically, in step S16 to step S18, N may be 3 to 15, for example, N may be 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15, and the greater N, the higher the accuracy of the propagation speed of the current obtained by the subsequent calculation. N may be an integer greater than 15 as desired. Preferably, N may be 5 to 7, and limiting N to the above range enables shortening the measurement time while achieving higher accuracy. The number of segments taken from the standard photovoltaic solder strip when the reference propagation speed is obtained may be the same as or different from the number of segments taken from the photovoltaic solder strip to be measured when the measured propagation speed is obtained.
Illustratively, when N is equal to 10, N is 3, 4, 5, 6, 7, 8, 9, 10. At the time of obtaining the length difference delta S between the second section and the first section 1 From the first time difference DeltaT 1 Thereafter, the second segment is replaced by the 3 rd segment, followed by steps S13-S14 in order to obtain a second time difference DeltaT 2 The method comprises the steps of carrying out a first treatment on the surface of the Similarly, the second segment is replaced by the 4 th segment to the 10 th segment in turn so as to obtain the corresponding time difference delta T 3 To DeltaT 9 The method comprises the steps of carrying out a first treatment on the surface of the Respectively calculating the length difference delta S between the 3 rd section, the 10 th section and the first section 2 To DeltaS 9 The method comprises the steps of carrying out a first treatment on the surface of the Coordinate point (DeltaT) 1 ,ΔS 1 ) To (DeltaT) 9 ,ΔS 9 ) Marking in a rectangular coordinate system, and fitting the coordinate points to form a straight line, wherein the slope of the straight line is the propagation speed of current in the photovoltaic solder strip; alternatively, ΔS is obtained 1 /ΔT 1 To DeltaS 9 /ΔT 9 The average value is the propagation speed of the current in the photovoltaic solder strip.
More preferably, the lengths from the first section to the nth section form an arithmetic series, and when the propagation speed of the current in the photovoltaic solder strip is calculated in a fitting manner, the coordinate points are distributed more uniformly, and a straight line is constructed more easily, so that the measurement accuracy can be improved.
In another embodiment, the step of obtaining the propagation speed of the current in the photovoltaic solder strip is:
step S11', a first section and a second section are cut from the photovoltaic solder strip, and the length of the second section is larger than that of the first section;
step S12', connecting a first segment to a first output terminal of the input excitation source 1 and a first input terminal of the output receiver 2, and connecting a second segment to a second output terminal of the input excitation source 1 and a second input terminal of the output receiver 2, the first output terminal being adapted to output a first electrical signal to cause the output receiver 2 to display a first curve, the second output terminal being adapted to output a second electrical signal to cause the output receiver 2 to display a second curve;
step S13', the input excitation source 1 outputs a first electric signal and a second electric signal at the same time, wherein the frequency of the first electric signal is the same as that of the second electric signal; adjusting the output frequency of the input excitation source 1, namely the frequency of the first electric signal and the frequency of the second electric signal, until the phase difference between the first curve and the second curve is 2 pi, and the output frequency at this time is the first full-wave frequency f 1 ；
Step S14', wherein the propagation speed of the current in the photovoltaic solder strip is the length difference DeltaL between the second section and the first section 1 With the first full wave frequency f 1 Is a product of (a) and (b).
The first section and the second section are intercepted from the standard photovoltaic solder strip and calculated by adopting the step S11 '-step S14', so that the reference propagation speed can be obtained; and (3) intercepting the first section and the second section from the photovoltaic solder strip to be tested, and calculating by adopting the step S11 '-step S14', so as to obtain the measured propagation speed. When the first set frequency is equal to the second set frequency, then the first full wave frequency is the same during the process of obtaining the measured propagation velocity and the reference propagation velocity.
Step S11 '-step S14' may be used to obtain the propagation speed of the current in the standard photovoltaic solder strip and the propagation speed in the photovoltaic solder strip to be tested, and this embodiment is more suitable for testing the propagation speed of the current in longer photovoltaic solder strips. The photovoltaic solder strip detection method provided by the embodiment of the invention has the advantages that the time for acquiring the propagation speed of the current in the photovoltaic solder strip is 1-2 minutes, the reference propagation speed or the measured propagation speed can be quickly acquired, whether the conductivity of the photovoltaic solder strip is qualified or not is quickly judged, the measurement time is not influenced by the length of the photovoltaic solder strip, and the measurement time is effectively shortened.
Preferably, the photovoltaic solder strip detection method further comprises the following steps:
step S15', intercepting third sections to N sections with different lengths from the photovoltaic solder strip, wherein the lengths of the third section to the N sections are all larger than the length of the first section and are not equal to the length of the second section, N is an integer larger than or equal to 3, and N is an integer larger than or equal to 3 and smaller than or equal to N;
step S16', remove the said second section, connect the second output end of the said input excitation source and second input end of the said output receiver of the nth section; the input excitation source outputs a first electric signal and a second electric signal simultaneously, and adjusts the output frequency of the input excitation source to obtain an n-1 th full-wave frequency f n-1 The length difference between the nth section and the first section is delta L n-1 Sequentially obtain Δf 2 To Deltaf N-1 And DeltaL 2 To DeltaL N-1 ；
Step S17', finding Δf 1 ×ΔL 1 To Deltaf N-1 ×ΔL N-1 The average value is the propagation speed of the current in the photovoltaic solder strip. The above steps can further improve the accuracy of the calculated propagation speed of the current.
Specifically, in step S15 '-step S17', N may be 3 to 15, for example, N may be 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15, and the greater N, the higher the accuracy of the propagation speed of the current obtained by the subsequent calculation. N may be an integer greater than 15 as desired. Preferably, N may be 5 to 7, and limiting N to the above range enables shortening the measurement time while achieving higher accuracy. The number of segments taken from the standard photovoltaic solder strip when the reference propagation speed is obtained may be the same as or different from the number of segments taken from the photovoltaic solder strip to be measured when the measured propagation speed is obtained.
In this embodiment, the input excitation source may be a signal source, and the output receiver may be an oscilloscope.
Example 2
Referring to fig. 2, this embodiment provides a photovoltaic solder strip detection system, which can detect a photovoltaic solder strip by using the photovoltaic solder strip detection method provided in embodiment 1, and is specifically used for detecting a first section and a second section that are respectively intercepted by the photovoltaic solder strip, where the length of the second section is greater than that of the first section. The photovoltaic solder strip detection system includes:
an input excitation source 1 for providing signal excitation, the input excitation source comprising a first output and a second output;
an output receiver 2 for receiving the test electrical signal and displaying a curve, the output receiver comprising a first input and a second input; the first section is suitable for being connected with the first output end and the first input end, the second section is suitable for being connected with the second output end and the second input end, the first output end is suitable for outputting a first electric signal to enable the output receiver to display a first curve, the second output end is suitable for outputting a second electric signal to enable the output receiver to display a second curve, and the frequency of the first electric signal is identical to that of the second electric signal;
and the analysis and calculation module (not shown in the figure) is suitable for calculating the propagation speed of the current in the photovoltaic solder strip according to at least the first curve and the second curve so as to judge whether the conductivity of the photovoltaic solder strip is qualified. The detection method specifically using step S11 to step S15 or the detection method using step S11 '-step S14' may be selected as needed.
In this embodiment, the input excitation source may be a signal source, and the output receiver may be an oscilloscope.
The photovoltaic solder strip detection method can accurately judge whether the conductivity of the photovoltaic solder strip is qualified or not, and is not influenced by the cross section area of the photovoltaic solder strip. The detection method is adopted to determine the good photovoltaic solder strip, so that the quality of the good photovoltaic solder strip applied to the photovoltaic module can be guaranteed, and the power of the photovoltaic module is further guaranteed.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (10)
1. The photovoltaic solder strip detection method is characterized by comprising the following steps of:
respectively obtaining a reference propagation speed of the current with the first set frequency in a standard photovoltaic solder strip and a measured propagation speed of the current with the second set frequency in the photovoltaic solder strip to be measured; the first set frequency is equal to the second set frequency;
determining whether the conductivity of the photovoltaic solder strip to be tested is qualified or not according to the reference propagation speed and the measured propagation speed;
wherein the step of determining the propagation speed from the reference propagation speed and the measured propagation speed comprises:
a first section and a second section are cut from the photovoltaic solder strip, and the length of the second section is greater than that of the first section;
connecting the first segment to a first output of an input excitation source and a first input of an output receiver, and connecting the second segment to a second output of the input excitation source and a second input of the output receiver, the first output being adapted to output a first electrical signal to cause the output receiver to display a first curve, the second output being adapted to output a second electrical signal to cause the output receiver to display a second curve;
the input excitation source outputs a first electric signal and a second electric signal at the same time, and the frequency of the first electric signal is the same as that of the second electric signal; and calculating the reference propagation velocity and the measured propagation velocity by using the phase difference between the first curve and the second curve under the condition.
2. The photovoltaic solder strip detection method according to claim 1, wherein when the measured propagation speed is greater than or equal to the reference propagation speed, the conductivity of the photovoltaic solder strip to be detected is determined to be acceptable; and when the measured propagation speed is smaller than the reference propagation speed, determining that the conductivity of the photovoltaic solder strip to be measured is unqualified.
3. The photovoltaic solder strip detection method according to claim 1 or 2, wherein the step of obtaining the propagation speed of the current in the photovoltaic solder strip comprises:
controlling the input excitation source to simultaneously output a first electric signal and a second electric signal, and acquiring a first phase difference of the first curve and the second curve by the output receiver;
calculating a first time difference delta T between the initial time of the output receiver displaying the first curve and the initial time of the output receiver displaying the second curve according to the first phase difference 1 ；
Calculating a length difference deltas between the second segment and the first segment 1 From the first time difference DeltaT 1 The ratio is the propagation speed of the current in the photovoltaic solder strip.
4. The photovoltaic solder strip detection method of claim 3, further comprising:
intercepting third to nth sections with different lengths from the photovoltaic solder strip, wherein the lengths of the third to nth sections are larger than the length of the first section and are not equal to the length of the second section, N is an integer larger than or equal to 3, and N is an integer larger than or equal to 3 and smaller than or equal to N;
removing the second section, and thenn sections are connected with a second output end of the input excitation source and a second input end of the output receiver; the input excitation source outputs a first electric signal and a second electric signal simultaneously, and obtains an n-1 time difference delta T between the initial time when the output receiver displays the first curve and the initial time when the output receiver displays the second curve n-1 The length difference between the nth section and the first section is delta S n-1 Sequentially obtain DeltaT 2 To DeltaT N-1 ；
Coordinate point (DeltaT) 1 ,ΔS 1 ) To (DeltaT) N-1 ,ΔS N-1 ) Marking in a rectangular coordinate system, and fitting the coordinate points to form a straight line, wherein the slope of the straight line is the propagation speed of current in the photovoltaic solder strip;
alternatively, ΔS is obtained 1 /ΔT 1 To DeltaS N-1 /ΔT N-1 The average value is the propagation speed of the current in the photovoltaic solder strip.
5. The method for inspecting a solder strip according to claim 4, wherein,
n is 3-15;
the lengths of the first segment to the nth segment form an arithmetic progression.
6. The photovoltaic solder strip detection method according to claim 3, wherein a difference in length between the second segment and the first segment is 1 meter or more, and a length of the first segment is 1 meter or more.
7. The photovoltaic solder strip detection method according to claim 1 or 2, wherein the step of obtaining the propagation speed of the current in the photovoltaic solder strip comprises:
adjusting the output frequency of the input excitation source until the phase difference between the first curve and the second curve is 2pi, and the output frequency at this time is the first full-wave frequency f 1 ；
The propagation speed of the current in the photovoltaic solder strip is the length difference delta L between the second section and the first section 1 With the first full wave frequency f 1 Is a product of (a) and (b).
8. The method of photovoltaic solder strip detection of claim 7, further comprising:
intercepting third to nth sections with different lengths from the photovoltaic solder strip, wherein the lengths of the third to nth sections are larger than the length of the first section and are not equal to the length of the second section, N is an integer larger than or equal to 3, and N is an integer larger than or equal to 3 and smaller than or equal to N;
removing the second section, and connecting the nth section with the second output end of the input excitation source and the second input end of the output receiver; the input excitation source outputs a first electric signal and a second electric signal simultaneously, and adjusts the output frequency of the input excitation source to obtain an n-1 th full-wave frequency f n-1 The length difference between the nth section and the first section is delta L n-1 Sequentially obtain Δf 2 To Deltaf N-1 And DeltaL 2 To DeltaL N-1 ；
Determining Δf 1 ×ΔL 1 To Deltaf N-1 ×ΔL N-1 The average value is the propagation speed of the current in the photovoltaic solder strip;
n is 3-15.
9. The method of claim 3, wherein the input excitation source is a signal source and the output receiver is an oscilloscope.
10. The photovoltaic welding strip detection system is used for detecting a first section and a second section which are intercepted by the photovoltaic welding strip respectively, and the length of the second section is larger than that of the first section; characterized by comprising the following steps:
an input excitation source for providing signal excitation, comprising a first output terminal and a second output terminal;
the output receiver is used for receiving the test electric signals and displaying curves and comprises a first input end and a second input end; the first section is adapted to connect the first output and the first input, and the second section is adapted to connect the second output and the second input; the first output end is suitable for outputting a first electric signal so that the output receiver displays a first curve, the second output end is suitable for outputting a second electric signal so that the output receiver displays a second curve, and the frequency of the first electric signal is the same as that of the second electric signal;
and the analysis and calculation module is suitable for calculating the propagation speed of the current in the photovoltaic solder strip at least according to the first curve and the second curve so as to judge whether the conductivity of the photovoltaic solder strip is qualified.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102053134B1 (en) * | 2019-05-31 | 2019-12-06 | 조성광 | Solar module junction box including embedded computer and solar installation having same |
| CN114553138A (en) * | 2022-01-29 | 2022-05-27 | 华为数字能源技术有限公司 | Photovoltaic system, and fault detection method and device of photovoltaic module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102053134B1 (en) * | 2019-05-31 | 2019-12-06 | 조성광 | Solar module junction box including embedded computer and solar installation having same |
| CN114553138A (en) * | 2022-01-29 | 2022-05-27 | 华为数字能源技术有限公司 | Photovoltaic system, and fault detection method and device of photovoltaic module |
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