CN115062262A - Solar cell series resistance estimation method - Google Patents
Solar cell series resistance estimation method Download PDFInfo
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- CN115062262A CN115062262A CN202210994316.1A CN202210994316A CN115062262A CN 115062262 A CN115062262 A CN 115062262A CN 202210994316 A CN202210994316 A CN 202210994316A CN 115062262 A CN115062262 A CN 115062262A
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- 238000012360 testing method Methods 0.000 claims abstract description 46
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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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
Abstract
The invention belongs to the technical field of solar cells, and relates to a solar cell series resistance estimation method, which comprises the steps of firstly measuring the maximum power point current and the maximum power point voltage under the current condition according to an instruction; calculating the current light intensity and temperature according to the maximum power point current, the open-circuit voltage, the short-circuit current, the maximum power point voltage, the current and the voltage temperature compensation coefficient under the standard test condition; then, calculating the current short-circuit current and the current open-circuit voltage; and finally, substituting the short-circuit current, the open-circuit voltage, the maximum power point current and the maximum power point voltage into a solar cell series resistance estimation formula to estimate the solar cell series resistance for battery performance analysis. The method can calculate the series resistance of the solar cell according to the model, and has higher precision and stronger applicability.
Description
Technical Field
The invention relates to the technical field of solar cells, in particular to a solar cell series resistance estimation method.
Background
Solar cell series resistance refers to various internal and contact resistances in the solar cell current path, and is one of the key electrical parameters of a solar cell. Detailed analysis of the series resistance of the solar cell allows the evaluation of the performance and degradation of the cell under outdoor conditions. In order to accurately and effectively extract the series resistance, Guke, Yuandfu, Wenqing, and Han Chi, a novel calculation model of the photovoltaic array equivalent series resistance is provided. However, the existing method cannot estimate the series resistance of the solar cell.
Disclosure of Invention
In order to estimate the series resistance of the solar cell, the invention provides a solar cell series resistance estimation method which is used for cell performance analysis.
The invention is realized by the following technical scheme, and the method for estimating the series resistance of the solar cell comprises the following steps:
s1, measuring the current and voltage of the maximum power point under the current condition according to the instruction;
s2, calculating the current light intensity and the current test temperature: calculating the current light intensity and the current test temperature according to the maximum power point current, the open-circuit voltage, the short-circuit current, the current temperature compensation coefficient and the voltage temperature compensation coefficient under the standard test condition;
in the formula (I), the compound is shown in the specification,I m is the maximum power point current,V m Is maximum power point voltage、SIs the current light intensity,S STC The light intensity is the standard test condition,I m-STC Maximum power point current, Δ, for standard test conditionsTFor the current test temperatureTTemperature of standard test conditionT STC Temperature difference (Δ)T=T-T STC )、aIs a current temperature compensation coefficient,I sc-STC Short-circuit current for standard test conditions,V oc-STC Open circuit voltage for standard test conditions,bA voltage temperature compensation coefficient;
solving the formulas (1) and (2) to obtain the current light intensitySAnd current test temperatureTTemperature of standard test conditionT STC Temperature difference ofT，Current test temperatureT=ΔT+ T STC ；
S3, calculating the short-circuit current and the open-circuit voltage under the current condition: calculating the short-circuit current and the open-circuit voltage under the current condition according to four measurement data of the short-circuit current, the open-circuit voltage, the maximum power point current and the maximum power point voltage under the standard test condition, a current temperature compensation coefficient, a voltage temperature compensation coefficient, the current light intensity and the current test temperature which are obtained by calculation in the step S2;
in the formula (I), the compound is shown in the specification,I sc is short-circuit current,V oc Is an open circuit voltage,V m-STC Maximum power point voltage for standard test conditions;
s4, estimating the series resistance of the solar cell: and substituting the short-circuit current, the open-circuit voltage, the maximum power point current and the maximum power point voltage into a solar cell series resistance estimation formula to estimate the solar cell series resistance for battery performance analysis.
Further preferably, the solar cell series resistance estimation formula is as follows:
in the formula (I), the compound is shown in the specification,R s is a solar cell series resistance.
The invention provides a solar cell series resistance estimation method which is mainly characterized in that only maximum power point current and maximum power point voltage are needed, and information such as light intensity, temperature and the like does not need to be measured. The field experiment result of the solar cell series resistance calculated by the method shows that the relative error between the existing measurement result and the solar cell series resistance calculated by the method is below 13 percent, the engineering precision requirement is met, and the method has higher practical engineering application value.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The present invention will be explained in further detail with reference to examples.
Referring to fig. 1, a method for estimating a series resistance of a solar cell includes the steps of:
s1, measuring the current and voltage of the maximum power point under the current condition according to the instruction;
s2, calculating the current light intensity and the current test temperature: according to the linear relation between the output current of the solar cell and the light intensity, the output current of the solar cell increases along with the increase of the temperature, and the output voltage of the solar cell and the light intensity have a logarithmic relation and decrease along with the increase of the temperature; under the assumption condition that the reverse saturation current of the battery diode is irrelevant to the light intensity and the small signal model analysis, the current light intensity and the current test temperature can be calculated according to the maximum power point current, the open-circuit voltage, the short-circuit current, the current temperature compensation coefficient and the voltage temperature compensation coefficient under the standard test condition;
in the formula (I), the compound is shown in the specification,I m is the maximum power point current,V m Is maximum power point voltage、SIs the current light intensity,S STC The light intensity is the standard test condition,I m-STC Maximum power point current, Δ, for standard test conditionsTFor the current test temperatureTTemperature of standard test conditionT STC Temperature difference (Δ)T=T-T STC )、aIs a current temperature compensation coefficient,I sc-STC Short-circuit current for standard test conditions,V oc-STC Open circuit voltage for standard test conditions,bA voltage temperature compensation coefficient;
solving the formulas (1) and (2) to obtain the current light intensitySAnd current test temperatureTTemperature of standard test conditionT STC Temperature difference ofT，Current test temperatureT=ΔT+ T STC ；
S3, calculating the short-circuit current and the open-circuit voltage under the current condition: calculating the short-circuit current and the open-circuit voltage under the current condition according to four measurement data of the short-circuit current, the open-circuit voltage, the maximum power point current and the maximum power point voltage under the standard test condition, a current temperature compensation coefficient, a voltage temperature compensation coefficient, the current light intensity and the current test temperature obtained by calculation in the step S2;
in the formula (I), the compound is shown in the specification,I sc is short-circuit current,V oc Is an open circuit voltage,V m-STC Maximum power point voltage for standard test conditions;
s4, estimating the series resistance of the solar cell: and substituting the short-circuit current, the open-circuit voltage, the maximum power point current and the maximum power point voltage into a solar cell series resistance estimation formula to estimate the solar cell series resistance for battery performance analysis.
The solar cell series resistance estimation formula is as follows:
in the formula (I), the compound is shown in the specification,R s is a solar cell series resistance.
As can be clearly seen from the above formula, the method of the invention only needs to measureI m 、V m Is calculated to obtainI sc 、V oc (ii) a Then substituting the series resistance into a simplified calculation formula to obtain the series resistance of the solar cellR s . The method has the greatest characteristic that only the maximum power point current and the maximum power point voltage are needed, and information such as light intensity, temperature and the like does not need to be measured. Solar cell series resistance calculated by the methodR s Compared with the measurement results, as shown in table 1.
From table 1, it can be seen that the anastomoses are better, their error is below 13%, indicating the accuracy of the method.
Claims (2)
1. A solar cell series resistance estimation method is characterized by comprising the following steps:
s1, measuring the maximum power point current and the maximum power point voltage under the current condition according to the instruction;
s2, calculating the current light intensity and the current test temperature: calculating the current light intensity and the current test temperature according to the maximum power point current, the open-circuit voltage, the short-circuit current, the current temperature compensation coefficient and the voltage temperature compensation coefficient under the standard test condition;
in the formula (I), the compound is shown in the specification,I m is the maximum power point current,V m Is maximum power point voltage、SIs the current light intensity,S STC The light intensity is the standard test condition,I m-STC Maximum power point current, Δ, for standard test conditionsTFor the current test temperatureTTemperature of standard test conditionT STC Temperature difference of (a)T=T-T STC 、aIs a current temperature compensation coefficient,I sc-STC Short-circuit current for standard test conditions,V oc-STC Open circuit voltage for standard test conditions,bA voltage temperature compensation coefficient;
solving the formulas (1) and (2) to obtain the current light intensitySAnd current test temperatureTTemperature of standard test conditionT STC Temperature difference ofT，Current test temperatureT=ΔT+ T STC ；
S3, calculating the short-circuit current and the open-circuit voltage under the current condition: calculating the short-circuit current and the open-circuit voltage under the current condition according to four measurement data of the short-circuit current, the open-circuit voltage, the maximum power point current and the maximum power point voltage under the standard test condition, a current temperature compensation coefficient, a voltage temperature compensation coefficient, the current light intensity and the current test temperature obtained by calculation in the step S2;
in the formula (I), the compound is shown in the specification,I sc is short-circuit current,V oc Is an open circuit voltage,V m-STC Maximum power point voltage for standard test conditions;
s4, estimating the series resistance of the solar cell: and substituting the short-circuit current, the open-circuit voltage, the maximum power point current and the maximum power point voltage into a solar cell series resistance estimation formula to estimate the solar cell series resistance for battery performance analysis.
2. The method of claim 1, wherein the solar cell series resistance estimation formula is:
in the formula (I), the compound is shown in the specification,R s is a solar cell series resistance.
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Citations (5)
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|---|---|---|---|---|
| JP2003133569A (en) * | 2001-10-30 | 2003-05-09 | Atsushi Iga | Method and apparatus for evaluating output of solar battery in field |
| CN102968535A (en) * | 2012-11-29 | 2013-03-13 | 江苏大学 | Modeling method for engineering mathematical model of solar cell |
| CN103454502A (en) * | 2013-08-21 | 2013-12-18 | 江苏大学 | Method of measuring series internal resistance of photovoltaic cells under any light intensity and any temperature |
| CN103532491A (en) * | 2013-10-25 | 2014-01-22 | 南昌航空大学 | Method for predicting performance of photovoltaic module under any light intensity and temperature |
| CN104242819A (en) * | 2014-10-11 | 2014-12-24 | 南昌航空大学 | Method for predicting photovoltaic power generation on basis of electrical parameters of battery at two different temperatures |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003133569A (en) * | 2001-10-30 | 2003-05-09 | Atsushi Iga | Method and apparatus for evaluating output of solar battery in field |
| CN102968535A (en) * | 2012-11-29 | 2013-03-13 | 江苏大学 | Modeling method for engineering mathematical model of solar cell |
| CN103454502A (en) * | 2013-08-21 | 2013-12-18 | 江苏大学 | Method of measuring series internal resistance of photovoltaic cells under any light intensity and any temperature |
| CN103532491A (en) * | 2013-10-25 | 2014-01-22 | 南昌航空大学 | Method for predicting performance of photovoltaic module under any light intensity and temperature |
| CN104242819A (en) * | 2014-10-11 | 2014-12-24 | 南昌航空大学 | Method for predicting photovoltaic power generation on basis of electrical parameters of battery at two different temperatures |
Non-Patent Citations (2)
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| 刘昶等: "光伏电池热电压动态模型及其仿真分析", 《电源技术》 * |
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