CN116707445A - Photovoltaic module fault positioning method and system - Google Patents
Photovoltaic module fault positioning method and system Download PDFInfo
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- CN116707445A CN116707445A CN202310973115.8A CN202310973115A CN116707445A CN 116707445 A CN116707445 A CN 116707445A CN 202310973115 A CN202310973115 A CN 202310973115A CN 116707445 A CN116707445 A CN 116707445A
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- MARUHZGHZWCEQU-UHFFFAOYSA-N 5-phenyl-2h-tetrazole Chemical compound C1=CC=CC=C1C1=NNN=N1 MARUHZGHZWCEQU-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
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- HVMJUDPAXRRVQO-UHFFFAOYSA-N copper indium Chemical compound [Cu].[In] HVMJUDPAXRRVQO-UHFFFAOYSA-N 0.000 description 1
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- 229910052733 gallium Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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- 238000003331 infrared imaging Methods 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- 238000013024 troubleshooting 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
- 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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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention provides a method and a system for positioning faults of a photovoltaic module, comprising the following steps: determining whether the photovoltaic module is faulty or not based on the environmental parameters and the voltage and current parameters of the photovoltaic module; if yes, judging the fault type of the photovoltaic module; determining the photovoltaic module group with faults based on the fault type and the sub-voltage current parameters of each group of photovoltaic modules; determining a failed photovoltaic module based on the thermal infrared image of the photovoltaic module group; the influence of shadows on the fault identification of the photovoltaic module is eliminated, the fault positioning accuracy is improved, and the operation load of the system is reduced.
Description
Technical Field
The invention relates to the technical field of photovoltaic detection, in particular to a method and a system for positioning faults of a photovoltaic module.
Background
The photovoltaic module is a device for converting solar energy into electric energy by utilizing light energy, and consists of a photocell cell piece, glass, a frame, a reflecting layer, a transparent upper layer and the like. When sunlight irradiates the photovoltaic module, the photocell is converted into current through the characteristics of the semiconductor material, and the current is connected by the collector wire and outputs electric energy. Types of photovoltaic modules include polycrystalline silicon photovoltaic modules, monocrystalline silicon photovoltaic modules, cdTe (cadmium telluride) thin film solar cell modules, CIGS (copper indium gallium sulfide) thin film solar cell modules. With the continuous emergence of new materials and new technologies, photovoltaic power generation is widely applied to the fields of household, business, industry and the like. However, as the use rate increases, the problem of failure of the photovoltaic module is also increasingly pronounced. In the prior art, a thermal infrared imager is used for capturing a temperature image of a photovoltaic module, and the image is processed through a computer, so that the detection and the positioning of the module fault are realized. However, the method of troubleshooting by infrared thermal imaging recognizes the photovoltaic module in shadow as a failed photovoltaic module; and the thermal infrared imager continuously acquires thermal infrared images and recognizes the acquired images, which can cause great burden to the system.
In view of the above, the invention provides a method and a system for positioning faults of a photovoltaic module, which eliminate the influence of shadows on the fault identification of the photovoltaic module, improve the accuracy of fault positioning and reduce the operation load of the system.
Disclosure of Invention
The invention aims to provide a photovoltaic module fault positioning method, which comprises the following steps: determining whether the photovoltaic module is faulty or not based on the environmental parameters and the voltage and current parameters of the photovoltaic module; if yes, judging the fault type of the photovoltaic module; determining the photovoltaic module group with faults based on the fault type and the sub-voltage current parameters of each group of photovoltaic modules; and determining the photovoltaic module with faults based on the thermal infrared image of the photovoltaic module group.
Further, determining whether the photovoltaic module is malfunctioning includes: determining standard voltage and current parameters output by the photovoltaic module based on the environmental parameters; judging whether the difference value between the voltage and current parameters and the standard voltage and current parameters is within a preset difference value threshold range or not; if not, determining the failure of the photovoltaic module.
Further, the judging the fault type of the photovoltaic module includes: constructing an initial fault type discrimination model; obtaining a training sample; the training sample comprises voltage and current parameters and corresponding fault states of the photovoltaic module in a standard environment; inputting the training sample into the initial fault type discrimination model, and constructing a loss function based on the output of the initial fault type discrimination model and the fault state; updating parameters of the initial fault type discrimination model based on the loss function until the value of the loss function is smaller than a preset loss threshold value; taking the last updated initial fault type discrimination model as the fault type discrimination model; and inputting the standard voltage and current parameters into the fault type discrimination model, and outputting the fault type by the model.
Further, the judging the fault type of the photovoltaic module includes: acquiring historical standard voltage and current parameters of the photovoltaic module; based on the historical standard voltage and current parameters, respectively obtaining historical voltage change conditions and historical current change conditions which are ordered according to time sequence; and determining the fault type based on the standard voltage-current parameter, the historical voltage change condition and the historical current change condition.
Further, the fault types include short circuit faults, open circuit faults, and shadows; the determining the fault type based on the standard voltage-current parameter, the historical voltage change condition, and the historical current change condition includes: judging whether the change of the standard voltage current parameter has periodicity in the historical voltage change condition and the historical current change condition; if the variation of the standard voltage current parameter has periodicity, determining that the fault is a shadow fault; if the variation of the standard voltage current parameter does not have periodicity, judging whether the current parameter is smaller than the standard current parameter; if the current parameter is smaller than the standard current parameter, judging that the fault is an open circuit fault; if the current parameter is not less than the standard current parameter, judging whether the voltage parameter is less than the standard voltage parameter; if the voltage parameter is smaller than the standard voltage parameter, judging that the fault is a short circuit fault; and if the voltage parameter is not smaller than the standard voltage parameter, determining whether the photovoltaic module fails or not again.
Further, for short-circuit faults; the determining of the failed photovoltaic module group includes: acquiring group voltage of each photovoltaic module group; taking the photovoltaic module group with the group voltage lower than the preset group voltage as a failed photovoltaic module group; the determining a failed photovoltaic module includes: and taking the photovoltaic module with the brightness smaller than a preset brightness threshold value in the thermal infrared image as the photovoltaic module with the fault.
Further, for open circuit faults; the determining of the failed photovoltaic module group includes: acquiring a thermal infrared image of each group of photovoltaic modules; taking the photovoltaic module group with the brightness smaller than a preset brightness threshold value in the thermal infrared image as a failed photovoltaic module group; the determining a failed photovoltaic module includes: acquiring a current value of each photovoltaic module; and taking the photovoltaic module with the current value lower than the preset module current as the failed photovoltaic module.
Further, the determining, based on the environmental parameter, a standard voltage and current parameter output by the photovoltaic module includes: determining a standard current based on the current, the current short-circuit current, the current sunlight intensity, the current temperature, the standard sunlight intensity, the standard temperature and the current temperature change relation of the photovoltaic module; and determining a standard voltage based on the current voltage, the current temperature, the standard current, the current and the voltage-temperature change relation of the photovoltaic module.
Further, the expression for determining the standard current is:
the expression for determining the standard voltage is as follows:
wherein ,representing a standard current; />Representing the current; />Representing the current of the short circuit; />Representing the difference between the standard sunlight intensity and the current sunlight intensity; />Representing the current sunlight intensity; />Representing the current temperature change relation; />Representing a standard temperature; />Representing the current temperature; />Representing a standard voltage; />Representing a current voltage; />Representing electricityA pressure-temperature variation relationship; />Representing the difference between the standard temperature and the current temperature; />Representing the difference between the standard current and the present current; />Representing the load resistance.
The invention aims to provide a photovoltaic module fault positioning system which comprises a fault determining module, a fault type judging module, a fault photovoltaic module group determining module and a fault photovoltaic module determining module; the fault determining module is used for determining whether the photovoltaic module is faulty or not based on the environmental parameters and the voltage and current parameters of the photovoltaic module; the fault type judging module is used for judging the fault type of the photovoltaic module when the photovoltaic module is in fault; the fault photovoltaic module group determining module is used for determining a photovoltaic module group with faults based on the fault type and sub-voltage current parameters of each group of photovoltaic modules; the fault photovoltaic module determining module is used for determining a photovoltaic module with faults based on the thermal infrared image of the photovoltaic module group.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects:
according to the invention, whether the photovoltaic module fails is determined, and the failed photovoltaic module is repositioned when the photovoltaic module fails, so that the problems that the infrared imaging equipment continuously acquires the thermal infrared image and processes the thermal infrared image to increase the burden of the system can be avoided. In addition, the abnormality of the photovoltaic module caused by shadow is eliminated during fault determination, the error of the follow-up fault identification of the photovoltaic module can be avoided, and the identification accuracy is improved.
According to the invention, the obtained voltage and current parameters of the photovoltaic module under different environments are converted into the standard voltage and current parameters under the same environment, and whether the photovoltaic module fails or not is judged based on the standard voltage and current parameters, so that the problem of error in identifying the failure caused by the change of the parameters of the photovoltaic module due to the change of the environments can be avoided.
According to the method, whether the change of the voltage and current parameters of the current photovoltaic module has periodicity is identified through the historical standard voltage and current parameters, and the problem of photovoltaic module abnormality caused by shadows is solved.
According to the invention, the voltage, the current and the thermal infrared image of the photovoltaic module are obtained to position the fault photovoltaic module, so that the workload can be reduced, the fault elimination of the photovoltaic modules one by one is avoided, only the photovoltaic modules in the fault photovoltaic module group are detected, and the fault elimination efficiency is improved.
Drawings
Fig. 1 is an exemplary flowchart of a method for positioning a fault of a photovoltaic module according to embodiment 1 of the present invention;
fig. 2 is an exemplary block diagram of a photovoltaic module fault location system provided in embodiment 1 of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Fig. 1 is an exemplary flowchart of a method for positioning a fault of a photovoltaic module according to embodiment 1 of the present invention. As shown in fig. 1, the process 100 includes:
step 110, determining whether the photovoltaic module is faulty based on the environmental parameter and the voltage-current parameter of the photovoltaic module. Step 110 may be performed by the fault determination module 210.
The environmental parameters may be used to characterize the condition of the surrounding environment of the photovoltaic module when it is in operation. For example, the environmental parameters may include parameters such as temperature, illumination intensity, weather conditions, and wind direction around the photovoltaic module. The voltage-current parameter may be used to characterize the condition of the voltage-current output by the photovoltaic module. For example, the voltage and current parameters may include parameters such as voltage magnitude, current magnitude, and maximum power output by the photovoltaic module.
Determining whether the photovoltaic module is faulty comprises: determining standard voltage and current parameters output by the photovoltaic module based on the environmental parameters; judging whether the difference value between the voltage and current parameters and the standard voltage and current parameters is within a preset difference value threshold range or not; if yes, determining that the photovoltaic module is not faulty; if not, determining the failure of the photovoltaic module. The standard voltage and current parameters may refer to the voltage and current that should be output by the photovoltaic module under the current temperature and lighting conditions. The preset difference threshold may be a maximum difference between a preset voltage and current parameter output by the photovoltaic module and a standard voltage and current parameter. And if the preset difference threshold is exceeded, determining that the photovoltaic module fails.
The determining, based on the environmental parameter, a standard voltage and current parameter output by the photovoltaic module includes: and determining the standard current based on the current, the current short-circuit current, the current sunlight intensity, the current temperature, the standard sunlight intensity, the standard temperature and the current temperature change relation of the photovoltaic module. And determining a standard voltage based on the current voltage, the current temperature, the standard current, the current and the voltage-temperature change relation of the photovoltaic module.
The present current may refer to a current value of the currently measured photovoltaic module (an output current value of all photovoltaic modules). The current short-circuit current may refer to a short-circuit current of the photovoltaic module in the current environment. The current solar intensity may refer to the solar intensity of the current environment. The current temperature may refer to the temperature of the current environment. The standard solar intensity may be the solar intensity in the reference environment. The standard temperature may be a temperature in a reference environment. The current temperature relationship of the photovoltaic module can be used for representing the influence condition of temperature on the current of the photovoltaic module, and can be obtained according to the performance of the photovoltaic module. The standard current may refer to an output current of the photovoltaic module under standard circumstances. The current voltage may refer to a voltage output by the photovoltaic module in the current environment. The voltage-temperature relationship of the photovoltaic module can be used for representing the influence condition of temperature on the voltage of the photovoltaic module, and can be obtained according to the performance of the photovoltaic module. The standard voltage may refer to an output voltage of the photovoltaic module under standard circumstances. The standard environment can be specifically designed according to the requirements. For example, the standard environment may be a temperature of 30 degrees, a solar intensity of 100000LUX, a sunny day. Solar intensity is a synonymous expression of illumination intensity.
The expression for determining the standard current is:
the expression for determining the standard voltage is as follows:
wherein ,representing a standard current; />Representing the current; />Representing the current of the short circuit; />Representing the difference between the standard sunlight intensity and the current sunlight intensity; />Representing the current sunlight intensity; />Representing the current temperature change relation; />Representing a standard temperature; />Representing the current temperature; />Representing a standard voltage; />Representing a current voltage; />Representing the voltage-temperature variation relationship; />Representing the difference between the standard temperature and the current temperature; />Representing the difference between the standard current and the present current; />Representing the load resistance.
And step 120, if yes, judging the fault type of the photovoltaic module. Step 120 may be performed by the fault type determination module 220.
The fault types may include short circuit faults, open circuit faults, and shadows of the photovoltaic module.
Embodiment 2, the determining the fault type of the photovoltaic module includes: constructing an initial fault type discrimination model; obtaining a training sample; the training sample comprises voltage and current parameters and corresponding fault states of the photovoltaic module in a standard environment; inputting the training sample into the initial fault type discrimination model, and constructing a loss function based on the output of the initial fault type discrimination model and the fault state; updating parameters of the initial fault type discrimination model based on the loss function until the value of the loss function is smaller than a preset loss threshold value; taking the last updated initial fault type discrimination model as the fault type discrimination model; and inputting the standard voltage and current parameters into the fault type discrimination model, and outputting the fault type by the model. The initial fault type discrimination model may be an LSTM model. Fault conditions may include short circuit faults, open circuit faults, and shadows. The preset loss threshold may be a maximum error value between a value output by the fault type discrimination model and an actual value.
Embodiment 3, wherein the determining the fault type of the photovoltaic module includes: acquiring historical standard voltage and current parameters of the photovoltaic module; based on the historical standard voltage and current parameters, respectively obtaining historical voltage change conditions and historical current change conditions which are ordered according to time sequence; and determining the fault type based on the standard voltage-current parameter, the historical voltage change condition and the historical current change condition.
The historical standard voltage-current parameter may refer to a standard voltage-current parameter of the historically obtained voltage-current parameter at standard temperature and solar intensity. The historical standard voltage and current parameters can be obtained by acquiring historical data, and the historical voltage change condition and the historical current change condition can be obtained by extracting the historical standard voltage and current parameters.
The determining the fault type based on the standard voltage-current parameter, the historical voltage change condition, and the historical current change condition includes: judging whether the change of the standard voltage current parameter has periodicity in the historical voltage change condition and the historical current change condition; if the variation of the standard voltage current parameter has periodicity, determining that the fault is a shadow fault; if the variation of the standard voltage current parameter does not have periodicity, judging whether the current parameter is smaller than the standard current parameter; if the current parameter is smaller than the standard current parameter, judging that the fault is an open circuit fault; if the current parameter is not less than the standard current parameter, judging whether the voltage parameter is less than the standard voltage parameter; if the voltage parameter is smaller than the standard voltage parameter, judging that the fault is a short circuit fault; and if the voltage parameter is not smaller than the standard voltage parameter, determining whether the photovoltaic module fails or not again.
The standard voltage parameter may refer to the voltage output by the normal photovoltaic module at the current temperature and solar intensity. The standard current parameter may refer to the current output by the normal photovoltaic module at the present temperature and solar intensity.
And step 130, determining the photovoltaic module group with faults based on the fault type and the sub-voltage current parameters of each group of photovoltaic modules. Step 130 may be performed by the faulty photovoltaic module group determination module 230.
A photovoltaic module group may refer to a group of photovoltaic modules connected in series. The sub-voltage current parameter may refer to a voltage current parameter output by the photovoltaic module group.
For short circuit faults; the determining of the failed photovoltaic module group includes: acquiring group voltage of each photovoltaic module group; and taking the photovoltaic module group with the group voltage lower than the preset group voltage as the photovoltaic module group with the fault.
The group voltage may refer to the voltage across the photovoltaic module group. The preset group voltage may refer to a preset minimum value of the voltage output by the photovoltaic module group.
For open circuit faults; the determining of the failed photovoltaic module group includes: acquiring a thermal infrared image of each group of photovoltaic modules; and taking the photovoltaic module group with the brightness smaller than a preset brightness threshold value in the thermal infrared image as a failed photovoltaic module group.
And 140, determining the photovoltaic module with faults based on the thermal infrared image of the photovoltaic module group. Step 140 may be performed by the failed photovoltaic module determination module 240.
For short circuit faults; the determining a failed photovoltaic module includes: and taking the photovoltaic module with the brightness smaller than a preset brightness threshold value in the thermal infrared image as the photovoltaic module with the fault.
The thermal infrared image may refer to an acquired thermal infrared image of the photovoltaic module. The preset brightness threshold may refer to the lowest brightness value generated by the positive Chang Guangfu component.
For open circuit faults; the determining a failed photovoltaic module includes: acquiring a current value of each photovoltaic module; and taking the photovoltaic module with the current value lower than the preset module current as the failed photovoltaic module.
The preset component current may refer to a minimum value of the current output by each normal photovoltaic component.
Fig. 2 is an exemplary block diagram of a photovoltaic module fault location system provided in embodiment 1 of the present invention. As shown in fig. 2, system 200 includes a fault determination module 210, a fault type determination module 220, a fault photovoltaic module group determination module 230, and a fault photovoltaic module determination module 240.
The fault determination module 210 is configured to determine whether the photovoltaic module is faulty based on the environmental parameter and the voltage current parameter of the photovoltaic module. For more details on the fault determination module 210, see FIG. 1 and its associated description.
The fault type judging module 220 is configured to judge a fault type of the photovoltaic module when the photovoltaic module fails. For more details on the fault type determination module 220, see FIG. 1 and its associated description.
The fault photovoltaic module group determining module 230 is configured to determine a photovoltaic module group that has a fault based on the fault type and the sub-voltage current parameter of each group of photovoltaic modules. For more details regarding the failed photovoltaic module group determination module 230, see fig. 1 and its associated description.
The fault photovoltaic module determining module 240 is configured to determine a photovoltaic module that has a fault based on the thermal infrared image of the photovoltaic module group. For more details regarding the failed photovoltaic module determination module 240, see FIG. 1 and its associated description.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The fault positioning method for the photovoltaic module is characterized by comprising the following steps of:
determining whether the photovoltaic module is faulty or not based on the environmental parameters and the voltage and current parameters of the photovoltaic module;
if yes, judging the fault type of the photovoltaic module;
determining the photovoltaic module group with faults based on the fault type and the sub-voltage current parameters of each group of photovoltaic modules;
and determining the photovoltaic module with faults based on the thermal infrared image of the photovoltaic module group.
2. The method of claim 1, wherein determining whether the photovoltaic module is malfunctioning comprises:
determining standard voltage and current parameters output by the photovoltaic module based on the environmental parameters;
judging whether the difference value between the voltage and current parameters and the standard voltage and current parameters is within a preset difference value threshold range or not;
if not, determining the failure of the photovoltaic module.
3. The method for positioning a fault of a photovoltaic module according to claim 2, wherein the determining the fault type of the photovoltaic module includes:
constructing an initial fault type discrimination model;
obtaining a training sample; the training sample comprises voltage and current parameters and corresponding fault states of the photovoltaic module in a standard environment;
inputting the training sample into the initial fault type discrimination model, and constructing a loss function based on the output of the initial fault type discrimination model and the fault state;
updating parameters of the initial fault type discrimination model based on the loss function until the value of the loss function is smaller than a preset loss threshold value;
taking the last updated initial fault type discrimination model as the fault type discrimination model;
and inputting the standard voltage and current parameters into the fault type discrimination model, and outputting the fault type by the model.
4. The method for positioning a fault of a photovoltaic module according to claim 2, wherein the determining the fault type of the photovoltaic module includes:
acquiring historical standard voltage and current parameters of the photovoltaic module;
based on the historical standard voltage and current parameters, respectively obtaining historical voltage change conditions and historical current change conditions which are ordered according to time sequence;
and determining the fault type based on the standard voltage-current parameter, the historical voltage change condition and the historical current change condition.
5. The method of claim 4, wherein the fault types include short circuit faults, open circuit faults, and shadows; the determining the fault type based on the standard voltage-current parameter, the historical voltage change condition, and the historical current change condition includes:
judging whether the change of the standard voltage current parameter has periodicity in the historical voltage change condition and the historical current change condition;
if the variation of the standard voltage current parameter has periodicity, determining that the fault is a shadow fault;
if the variation of the standard voltage current parameter does not have periodicity, judging whether the current parameter is smaller than the standard current parameter;
if the current parameter is smaller than the standard current parameter, judging that the fault is an open circuit fault;
if the current parameter is not less than the standard current parameter, judging whether the voltage parameter is less than the standard voltage parameter;
if the voltage parameter is smaller than the standard voltage parameter, judging that the fault is a short circuit fault;
and if the voltage parameter is not smaller than the standard voltage parameter, determining whether the photovoltaic module fails or not again.
6. The method of claim 5, wherein for a short circuit fault; the determining of the failed photovoltaic module group includes:
acquiring group voltage of each photovoltaic module group;
taking the photovoltaic module group with the group voltage lower than the preset group voltage as a failed photovoltaic module group;
the determining a failed photovoltaic module includes:
and taking the photovoltaic module with the brightness smaller than a preset brightness threshold value in the thermal infrared image as the photovoltaic module with the fault.
7. The method of claim 5, wherein for an open circuit fault; the determining of the failed photovoltaic module group includes:
acquiring a thermal infrared image of each group of photovoltaic modules;
taking the photovoltaic module group with the brightness smaller than a preset brightness threshold value in the thermal infrared image as a failed photovoltaic module group;
the determining a failed photovoltaic module includes:
acquiring a current value of each photovoltaic module;
and taking the photovoltaic module with the current value lower than the preset module current as the failed photovoltaic module.
8. The method for positioning a fault of a photovoltaic module according to claim 2, wherein determining a standard voltage and current parameter output by the photovoltaic module based on the environmental parameter comprises:
determining a standard current based on the current, the current short-circuit current, the current sunlight intensity, the current temperature, the standard sunlight intensity, the standard temperature and the current temperature change relation of the photovoltaic module;
and determining a standard voltage based on the current voltage, the current temperature, the standard current, the current and the voltage-temperature change relation of the photovoltaic module.
9. The method for locating a fault in a photovoltaic module according to claim 8, wherein the expression for determining the standard current is:
the expression for determining the standard voltage is as follows:
wherein ,representing a standard current; />Representing the current; />Representing the current of the short circuit; />Representing the difference between the standard sunlight intensity and the current sunlight intensity; />Representing the current sunlight intensity; />Representing the current temperature change relation; />Representing a standard temperature; />Representing the current temperature; />Representing a standard voltage; />Representing a current voltage; />Representing the voltage-temperature variation relationship; />Representing the difference between the standard temperature and the current temperature; />Representing the difference between the standard current and the present current; />Representing the load resistance.
10. The photovoltaic module fault positioning system is characterized by comprising a fault determining module, a fault type judging module, a fault photovoltaic module group determining module and a fault photovoltaic module determining module;
the fault determining module is used for determining whether the photovoltaic module is faulty or not based on the environmental parameters and the voltage and current parameters of the photovoltaic module;
the fault type judging module is used for judging the fault type of the photovoltaic module when the photovoltaic module is in fault;
the fault photovoltaic module group determining module is used for determining a photovoltaic module group with faults based on the fault type and sub-voltage current parameters of each group of photovoltaic modules;
the fault photovoltaic module determining module is used for determining a photovoltaic module with faults based on the thermal infrared image of the photovoltaic module group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310973115.8A CN116707445B (en) | 2023-08-04 | 2023-08-04 | Photovoltaic module fault positioning method and system |
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| CN202310973115.8A CN116707445B (en) | 2023-08-04 | 2023-08-04 | Photovoltaic module fault positioning method and system |
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|---|---|
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