CN108365820A - A kind of solar cell surface cleannes judgment method measured based on open-circuit voltage - Google Patents
A kind of solar cell surface cleannes judgment method measured based on open-circuit voltage Download PDFInfo
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- CN108365820A CN108365820A CN201810065948.3A CN201810065948A CN108365820A CN 108365820 A CN108365820 A CN 108365820A CN 201810065948 A CN201810065948 A CN 201810065948A CN 108365820 A CN108365820 A CN 108365820A
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- 210000004027 cell Anatomy 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005286 illumination Methods 0.000 claims abstract description 24
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 7
- 230000004907 flux Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000000627 alternating current impedance spectroscopy Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007850 degeneration Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
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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
- H02S50/15—Testing of PV devices, e.g. of PV modules or single PV cells using optical means, e.g. using electroluminescence
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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
Abstract
The present invention relates to a kind of solar cell surface cleannes judgment methods measured based on open-circuit voltage, belong to new energy and energy-efficient field.The present invention measures corresponding solar cell clean state open-circuit voltage and equivalent series resistance at a temperature of varying environment, obtains specify the matched curve of open-circuit voltage and environment temperature and the matched curve of equivalent series resistance and environment temperature under intensity of illumination under solar cell clean state respectively；In the operating condition, certain moment solar cell output voltage, electric current and environment temperature under identical intensity of illumination are measured, open-circuit voltage of the solar cell under the moment working condition is calculated；Open-circuit voltage under corresponding solar cell clean state is obtained under the moment environment temperature by matched curve, the variation for passing through open-circuit voltage judges solar cell surface clean level.The present invention realizes the online judgement to solar cell surface cleannes, expands solar cell and monitors content on-line, reduce O＆M cost, improves O＆M efficiency.
Description
Technical field
The present invention relates to a kind of solar cell surface cleannes judgment methods measured based on open-circuit voltage, belong to new energy
Source and high-efficiency energy-saving technology field.
Background technology
Ended for the end of the year 2016, Chinese photovoltaic plant adds up total installation of generating capacity and reached 77.42GW, ranks first in the world.
While photovoltaic industry continues to develop, the O＆M that also should constantly promote photovoltaic plant is horizontal.Wherein, skill is monitored on-line by development
Art, photovoltaic plant can understand the working condition of solar cell in time, be accurately positioned failure and the maintenance that is refined and
Repair, this will be significantly reduced operation cost, improve generating efficiency.
PN type solar cells are especially made in photovoltaic generation industry extensively in actual industrial production
With.Direct current equivalent model under general PN junction solar cell illumination is as shown in Figure 1.Wherein IphIt is constant-current source, indicates under illumination
The photoelectric current that solar cell generates；RshIt is the parallel resistance of solar cell, also referred to as ohmic leakage, indicates because of technique etc.
The size for the leakage current that reason generates；RsIt is the series resistance of solar cell, indicates the connection resistance and contact resistance of battery.
Vout、IoutThe output voltage and electric current of solar cell are indicated respectively, wherein voltage V when open circuitOCIt indicates.
Open-circuit voltage has important reference significance in the practical work process of solar cell, can in real time in a short time
The transfer efficiency of battery is characterized, over a period to come, in the case that apparent aging or damage do not occur for solar cell, passes through survey
Its surface cleanness degree can be understood by determining the open-circuit voltage of battery under the conditions of certain environment, be conducive to power station and carried out planned fortune
Seek maintenance management.
There are mainly two types of traditional solar cell open-circuit voltage measurement methods：One is the sides measured using voltage meter
Method directly uses voltage meter to measure battery open circuit voltage, can be by volt when voltage meter resistance is much larger than the internal resistance of cell
The output of table is similar to battery open circuit voltage；Another kind is to be constructed potential compensation circuit using the method for potential compensation, passed through tune
Whole rheostat keeps cell output voltage consistent with compensation circuit voltage, and it is zero to make cell output current, to measure battery open circuit
Voltage.In addition there are using the methods of binary channels source measuring instrumentss and electrochemical workstation.The common ground of these methods is all to need
Solar cell is detached from original system, belongs to off-line measurement, cannot achieve the online of solar cell open-circuit voltage
It measures.
There are two main classes for the measurement method of traditional solar cell equivalent series resistance：Curve-fitting method and I-V characteristic
Curve method.Curve-fitting method is the double diode model based on solar cell, utilizes the voltage and current value under no light condition
Fitting obtains battery parameter, computationally intensive since its error is larger, general less use.I-V characteristic curve method is to utilize illumination
The I-V characteristic curve of lower solar cell acquires series and parallel compensated resistance, mainly there is light and shade curve comparison method, Slope Method, area-method, most
The characteristics of high-power method etc., this method, measurement result was more accurate but more demanding to measuring condition, generally in laboratory item
It is used under part.The impedance scale method based on ac impedance spectroscopy of newest proposition, the friendship of battery is obtained by ac small signal
Properties of flow can realize the measurement to solar cell equivalent series resistance and calculating.
Invention content
The purpose of the present invention is to overcome the shortcoming of prior art, propose a kind of sun measured based on open-circuit voltage
It can battery surface cleannes judgment method.The present invention can realize the online judgement of solar cell surface cleannes, expand too
The content of positive energy battery on-line monitoring, reduces O＆M cost, improves O＆M efficiency.
A kind of solar cell surface cleannes judgment method measured based on open-circuit voltage of the present invention, which is characterized in that
This approach includes the following steps：
(1) solar cell to be detected is chosen, is measured in environment temperature T01, T02... T0mThe lower solar cell
Corresponding equivalent series impedance RS, 01, Rs,02... Rs,0m, wherein m is to measure serial number；
(2) it is E in selected intensity of illumination under the solar cell clean state that measuring process (1) is chosen0When, respectively in temperature
Spend T01, T02... T0mUnder corresponding open-circuit voltage VOC,01, VOC,02... VOC,0m；
(3) by temperature T01, T02... T0mThe corresponding equivalent series impedance R of lower solar cells,01, Rs,02...
Rs,0mIt is fitted, obtains solar cell equivalent series resistance RsWith the matched curve of environment temperature T；By temperature T01, T02...
T0mIntensity of illumination is E under lower solar cell clean state0When corresponding open-circuit voltage VOC,01, VOC,02... VOC,0mIt carries out
Fitting, it is E to obtain intensity of illumination under solar cell clean state0When open-circuit voltage VOCWith the matched curve of environment temperature T；
(4) so that under solar cell is in running order, selection intensity of illumination is E0At the time of be denoted as ti, measure tiWhen
Carve the corresponding output voltage V of solar cellout,iWith electric current Iout,iAnd environment temperature Ti；
(5) R obtained by step (3)sWith the matched curve of T, obtain in environment temperature TiUnder corresponding tiThe moment sun
It can battery equivalent series impedance Rs,i；
(6) solar cell t is calculatediThe open-circuit voltage V of moment in the operating conditionOC,ti, expression formula is as follows：
VOC,ti=Iout,iRs,i+Vout,i
(7) V obtained by step (3)OCWith the matched curve of T, obtain in temperature TiUnder corresponding tiMoment solar energy
Open-circuit voltage V under battery clean stateOC,i；
(8) t is calculatediWhen inscribe the surface cleanness μ of solar celliAnd judged；
tiWhen inscribe the surface cleanness μ of solar celliCalculation expression is as follows：
μi=VOC,ti/VOC,i
Work as μiWhen=1, show that the moment solar cell surface cleans very much；Work as μiWhen >=0.8, show the moment sun
Energy battery surface more cleans；Work as μiWhen≤0.8, show that the moment solar cell surface clean-up performance is poor.
The features of the present invention and advantageous effect are：
A kind of solar cell surface cleannes judgment method measured based on open-circuit voltage proposed by the present invention, is to be based on
The solar cell surface cleannes judgment method of electric parameter measurement, can avoid over by virtue of experience to battery surface cleannes
Qualitatively judge and predict, provides a kind of method quantitatively judged battery surface cleannes, this method is not necessarily to
Solar cell is detached from original system, be solar cell under application scenarios, especially under photovoltaic plant environment
Operation maintenance provide it is a kind of on-line monitoring solar cell surface cleannes method, expand solar cell on-line monitoring
Content reduces O＆M cost, improves O＆M efficiency.
Description of the drawings
Fig. 1 is schematic equivalent circuit of the PN types solar cell in open circuit under illumination.
Fig. 2 is the experimental data schematic diagram of solar cell open-circuit voltage in the embodiment of the present invention.
Specific implementation mode
The present invention proposes a kind of solar cell surface cleannes judgment method measured based on open-circuit voltage, with reference to
The drawings and specific embodiments are further described as follows.
The present invention proposes a kind of solar cell surface cleannes judgment method measured based on open-circuit voltage, including following
Step：
(1) solar cell to be detected is chosen (to solar cell model without specific requirement, to adopt in the present embodiment
Use brilliant section XX models solar cell module as sample), measure a series of environment temperature T01, T02... T0mThe lower solar-electricity
The corresponding equivalent series impedance R in pondS, 01, Rs,02... Rs,0m(m is to measure serial number, and the value range of environment temperature is general
For the high-low limit value of cell operating conditions temperature, m and environment temperature interval are without particular/special requirement, generally according to available accuracy need
Depending on asking.- 20 DEG C to 50 DEG C of environment temperature value range in the present embodiment, sampling interval are 5 DEG C), solar cell equivalent string
The measurement of connection resistance can pass through the methods of curve-fitting method, I-V characteristic curve method, impedance ruler method；
(2) it is E in selected intensity of illumination under the solar cell clean state that measuring process (1) is chosen0When, respectively in temperature
Spend T01, T02... T0mUnder corresponding open-circuit voltage VOC,01, VOC,02... VOC,0m；The clean state refers to solar cell and just carries out
State of the over cleaning surface without apparent dust stratification, intensity of illumination E0The intensity of sunshine average value of working environment residing for desirable battery；
(3) by temperature T01, T02... T0mThe corresponding equivalent series impedance R of lower solar cells,01, Rs,02...
Rs,0mIt is fitted, obtains solar cell equivalent series resistance RsWith the matched curve of environment temperature T；By temperature T01, T02...
T0mIntensity of illumination is E under lower solar cell clean state0When corresponding open-circuit voltage VOC,01, VOC,02... VOC,0mIt carries out
Fitting, it is E to obtain intensity of illumination under solar cell clean state0When open-circuit voltage VOCWith the matched curve of environment temperature T；
(4) so that under solar cell is in running order, it is E to choose n intensity of illumination0At the time of be denoted as t respectively1,
t2... tn, (n according to the dust concentration of actual working environment, 1 to 10 measurement point, i.e. n=1 can be taken in one month, 2 ...
10) above-mentioned each moment t, is measured respectivelyiThe corresponding output voltage V of solar cellout,iWith electric current Iout,i, and the corresponding moment
Environment temperature Ti, i=1,2 ... n；
(5) R obtained by step (3)sWith the matched curve of T, obtain in temperature Ti, i=1,2 ... corresponding t under ni
Moment solar cell equivalent series impedance Rs,i；
(6) solar cell t is calculatediThe open-circuit voltage V of moment in the operating conditionOC,ti, expression formula is as follows：
VOC,ti=Iout,iRs,i+Vout,i
(7) V obtained by step (3)OCWith the matched curve of T, obtain in temperature Ti, i=1,2 ... corresponding t under ni
Open-circuit voltage V under moment solar cell clean stateOC,i；
(8) t is calculatediWhen inscribe the surface cleanness μ of solar celliAnd judged；
tiWhen inscribe the surface cleanness μ of solar celliCalculation expression is as follows：
μi=VOC,ti/VOC,i。
The solar cell t obtained by step (6)iMoment (temperature Ti) open-circuit voltage VOC,tiIt is obtained with step (7)
The solar cell t arrivediOpen-circuit voltage V under moment clean stateOC,iThe ratio between indicate battery cleannes μiBigger (μiValue
Ranging from 0≤μi≤ 1), cleannes are higher, show tiMoment solar cell surface more cleans：Work as μiShow the moment when=1
Solar cell surface cleans very much, works as μiShow that the moment solar cell surface more cleans when >=0.8, works as μiWhen≤0.8
Show that the moment solar cell surface clean-up performance is poor, has influenced cell power generation amount and reduced by more than 20%.
The present embodiment is by calculating μ1,μ2,…μnN cleaning degrees of data can obtain solar cell surface cleannes and exist
In regular period the case where consecutive variations, be conducive to carry out more acurrate judgement and prediction to battery cleannes, when cleannes decline
(or prediction declines) arrives certain value, when such as 0.8, can carry out the cleaning of battery surface, improves cleannes to improve battery hair
Electrical efficiency.
Due to cell degradation etc., solar cell open-circuit voltage VOCWith equivalent series battery RsIt can occur slowly to become
Change, therefore (being usually 1 year) step (1) should be returned to after a certain time, obtains new VOCMatched curve with T and
New RsWith the measurement and judgement for carrying out solar energy cleannes after T matched curves again.
The operation principle of the method for the present invention described in detail below：
The pc equivalent circuit of solar cell is as shown in Figure 1, wherein IphIt is constant-current source, indicates battery generation under illumination
Photoelectric current；RshIt is the parallel resistance of battery, also referred to as ohmic leakage, indicates because of the big of the leakage current that the reasons such as technique generate
It is small；RsIt is the series resistance of battery, indicates the connection resistance and contact resistance of battery.Vout、IoutSolar cell is indicated respectively
Output voltage and electric current, wherein open circuit when voltage VOCIt indicates.VOCMeet following condition：
Wherein, VPNFor solar cell PN junction both end voltage in Fig. 1 institutes representation model, ISCIt is the short circuit current of battery, k is
Boltzmann constant, TcIt is thermodynamic temperature, I0It is dark current.
Open-circuit voltage VOCAs important electrical parameter generally before manufacture will random sampling measure and mark.Pass through
A large amount of actual, historical data and accelerate degeneration experimental data it was found that during solar cell working, certain illumination
It is very small with the rate that changes with time of the clean solar cell open-circuit voltage under temperature condition, in the short term it is considered that not
Become.As shown in Fig. 2, solar cell is (usually corresponding in the industrial production after the thermal cycle Acceleration study for undergoing 400 periods
In real work 30,000 hours), open circuit voltage variations are only 0.26%.Therefore basic assumption, that is, certain illumination of this method and temperature
Under the conditions of degree, clean solar cell open-circuit voltage is basically unchanged in a short time can be considered establishment.
Simultaneously by the physical principle of solar cell, the short circuit current I of batterySCSize and photoelectric current IphIt is equal, Iph's
Size is determined by the quantum efficiency of incident flux and crystal silicon cell.Wherein incident flux enters solar energy from the external world
The flux of the light of battery, quantum efficiency then depend on the physical parameter of crystal silicon cell.Crystal silicon cell is not sent out in the short term
Under conditions of raw significantly sacrificing or aging, physical parameter can be considered constant, i.e. I0It is constant.As it can be seen that identical in other conditions
In the case of, the clean-up performance of battery surface directly influences the flux that illumination enters battery, to influence short circuit current ISC, in turn
Influence the open-circuit voltage V of batteryOC.Therefore after the environmental factors such as control illumination, temperature, pass through the size of open-circuit voltage
To judge clean-up performance that battery shows.
In the case where solar cell open-circuit voltage is constant, by Fig. 1 models, we can obtain：
VOC=Vout+IoutRs (2)
Open-circuit voltage V can be obtained by the output current of solar cell, voltage and equivalent series resistanceOC。
Claims (1)
1. a kind of solar cell surface cleannes judgment method measured based on open-circuit voltage, which is characterized in that this method packet
Include following steps：
(1) solar cell to be detected is chosen, is measured in environment temperature T01, T02... T0mLower solar cell difference
Corresponding equivalent series impedance RS, 01, Rs,02... Rs,0m, wherein m is to measure serial number；
(2) it is E in selected intensity of illumination under the solar cell clean state that measuring process (1) is chosen0When, respectively in temperature
T01, T02... T0mUnder corresponding open-circuit voltage VOC,01, VOC,02... VOC,0m；
(3) by temperature T01, T02... T0mThe corresponding equivalent series impedance R of lower solar cells,01, Rs,02... Rs,0mInto
Row fitting, obtains solar cell equivalent series resistance RsWith the matched curve of environment temperature T；By temperature T01, T02... T0mUnder
Intensity of illumination is E under solar cell clean state0When corresponding open-circuit voltage VOC,01, VOC,02... VOC,0mIntended
It closes, it is E to obtain intensity of illumination under solar cell clean state0When open-circuit voltage VOCWith the matched curve of environment temperature T；
(4) so that under solar cell is in running order, selection intensity of illumination is E0At the time of be denoted as ti, measure tiWhen
Carve the corresponding output voltage V of solar cellout,iWith electric current Iout,iAnd environment temperature Ti；
(5) R obtained by step (3)sWith the matched curve of T, obtain in environment temperature TiUnder corresponding tiMoment solar-electricity
Pond equivalent series impedance Rs,i；
(6) solar cell t is calculatediThe open-circuit voltage V of moment in the operating conditionOC,ti, expression formula is as follows：
VOC,ti=Iout,iRs,i+Vout,i
(7) V obtained by step (3)OCWith the matched curve of T, obtain in temperature TiUnder corresponding tiMoment solar cell is clean
Open-circuit voltage V under net stateOC,i；
(8) t is calculatediWhen inscribe the surface cleanness μ of solar celliAnd judged；
tiWhen inscribe the surface cleanness μ of solar celliCalculation expression is as follows：
μi=VOC,ti/VOC,i
Work as μiWhen=1, show that the moment solar cell surface cleans very much；Work as μiWhen >=0.8, show the moment solar-electricity
Pool surface more cleans；Work as μiWhen≤0.8, show that the moment solar cell surface clean-up performance is poor.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114843369A (en) * | 2022-04-28 | 2022-08-02 | 晶科能源(海宁)有限公司 | Monitoring method of solar cell preparation process |
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| CN101603988A (en) * | 2008-06-12 | 2009-12-16 | 中茂电子(深圳)有限公司 | Series resistors inside solar energy battery measuring method and measuring system |
| EP2367206A2 (en) * | 2010-03-15 | 2011-09-21 | voltwerk electronics GmbH | Protection circuit for a Photovoltaic device |
| JP2016149890A (en) * | 2015-02-13 | 2016-08-18 | 国立研究開発法人産業技術総合研究所 | Evaluation method and evaluation device for solar cell |
-
2018
- 2018-01-22 CN CN201810065948.3A patent/CN108365820B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1483508B1 (en) * | 1962-03-14 | 1970-08-06 | Siderurgie Fse Inst Rech | Method for regulating the induced draft for sucking off exhaust gases sucked into a flue duct when refining metal melts |
| CN101603988A (en) * | 2008-06-12 | 2009-12-16 | 中茂电子(深圳)有限公司 | Series resistors inside solar energy battery measuring method and measuring system |
| EP2367206A2 (en) * | 2010-03-15 | 2011-09-21 | voltwerk electronics GmbH | Protection circuit for a Photovoltaic device |
| JP2016149890A (en) * | 2015-02-13 | 2016-08-18 | 国立研究開発法人産業技術総合研究所 | Evaluation method and evaluation device for solar cell |
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| CN114843369A (en) * | 2022-04-28 | 2022-08-02 | 晶科能源(海宁)有限公司 | Monitoring method of solar cell preparation process |
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