CN112198359A - Current sampling system and method of photovoltaic module - Google Patents
Current sampling system and method of photovoltaic module Download PDFInfo
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- 238000005070 sampling Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 62
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- 238000012216 screening Methods 0.000 claims description 2
- 238000010248 power generation Methods 0.000 abstract description 5
- 238000009659 non-destructive testing Methods 0.000 abstract 1
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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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 photovoltaic power generation, in particular to a current sampling system and a method of a photovoltaic module, which solve the problem that the current generated by the photovoltaic module cannot be safely measured under the condition of no loss, and the method comprises the following steps: the system comprises a current transformer, a data acquisition module and a data processing module, wherein the current transformer is used for sampling current data in a current link and transmitting the current data related to the current link to an access gateway; the access gateway receives current data in respective associated current links collected by at least one current transformer and reports the obtained current data to the processing equipment; and the processing equipment receives and records the current data of the corresponding current link reported by each access gateway. Therefore, the current link is sampled at one time through the current transformer, the traditional mode of measuring the current of the photovoltaic module is replaced, nondestructive testing is realized on the basis of not influencing the original circuit, the power loss of current sampling is greatly reduced, and the sampling efficiency and the sampling precision of the current are improved.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a current sampling system and method of a photovoltaic module.
Background
Along with the popularization of photovoltaic power generation technology, the performance requirements of photovoltaic modules are gradually improved, in order to improve electric energy obtained by photovoltaic power generation, a plurality of photovoltaic modules are generally combined and connected, specifically, a photovoltaic intelligent junction box is configured and installed for each photovoltaic module, so that the photovoltaic modules can be connected through the photovoltaic intelligent junction box, and meanwhile, in order to guarantee the normal use of each photovoltaic module, people determine the operation condition of each photovoltaic module through sampling of each photovoltaic module.
In the prior art, an output index of a photovoltaic module is usually measured by using a photovoltaic intelligent junction box, specifically, for current sampling, the photovoltaic intelligent junction box usually performs current sampling detection on an associated photovoltaic module by using a resistance sampling mode, determines a voltage drop at two ends of a resistor, and further determines a current output by the corresponding photovoltaic module, wherein the association relation means that the photovoltaic intelligent junction box is installed on the photovoltaic module and samples the photovoltaic module.
However, the current generates heat when flowing through the resistor, so that on one hand, the electric energy generated by the photovoltaic module is consumed, and useless work is generated, and on the other hand, the temperature of the photovoltaic intelligent junction box is increased due to heating of the resistor, so that normal work cannot be guaranteed, and potential safety hazards are brought.
In view of the above, a new current sampling method for photovoltaic modules is needed to solve the above problems.
Disclosure of Invention
The embodiment of the invention provides a current sampling system and method of a photovoltaic module, which are used for solving the problem that the current generated by the photovoltaic module cannot be safely measured under the condition of no loss in the prior art.
The embodiment of the invention provides the following specific technical scheme:
in a first aspect, a current sampling system for a photovoltaic module is provided, including:
the current transformer is used for sampling current data in a current link and transmitting the current data related to the current link to an access gateway, wherein the current link comprises at least one photovoltaic assembly connected in series;
the access gateway is used for receiving current data in each associated current link collected by at least one current transformer, taking the collected current data as a current measurement value of each photovoltaic module on the associated current link, and reporting the obtained current data to the processing equipment;
and the processing equipment receives and records the current data of the corresponding current link reported by each access gateway, marks a corresponding timestamp corresponding to the current data and stores the marked current data.
Optionally, the current sampling system further includes an intelligent junction box, and the intelligent junction box is configured to:
outputting electric energy generated by the associated photovoltaic module, and connecting the electric energy with other intelligent junction boxes in series to form a current link;
collecting operation data of the photovoltaic module, and reporting the operation data to the access gateway, wherein the operation data comprises voltage data and temperature data of the photovoltaic module.
Optionally, the access gateway is further configured to:
receiving operation data reported by each intelligent junction box, and taking the operation data and a measured current value corresponding to the photovoltaic module associated with the intelligent junction box as sampling data of each corresponding photovoltaic module;
and processing the obtained sampling data of each corresponding photovoltaic module according to a specified data format, and reporting the processed sampling data to the processing equipment.
Optionally, the processing device is further configured to:
receiving sampling data of each photovoltaic module sent by an access gateway, marking corresponding time stamps for the sampling data and storing the marked sampling data.
Optionally, the processing device further includes:
and acquiring data associated with the photovoltaic modules under different timestamps, and analyzing the operating conditions of the corresponding photovoltaic modules based on the associated data.
Optionally, the processing device is further configured to:
acquiring stored sampling data which are marked with latest recorded timestamps and are related to each photovoltaic assembly;
and screening out the photovoltaic modules of which the temperature data in the sampling data exceed a preset temperature threshold value, taking the screened photovoltaic modules as abnormal photovoltaic modules, and displaying corresponding abnormal information.
Optionally, further comprising:
the deployment positions of the access gateway and the current transformers are not fixed, the access gateway is connected with at least one current transformer through an extensible interface, and current data sampled by the at least one current transformer are received.
In a second aspect, a current sampling method for a photovoltaic module is provided, which includes:
receiving current data in each associated current link collected by at least one current transformer, and taking the collected current data as current measurement values of each photovoltaic module on the associated current link;
and reporting each obtained current data to a processing device, so that the processing device receives a timestamp corresponding to the current data mark and stores the marked current data.
In a third aspect, an electronic device is provided, including:
a memory for storing executable instructions;
the processor is used for reading and executing the executable instructions stored in the memory so as to receive the current data in the respective associated current link collected by at least one current transformer and take the collected current data as the current measurement value of each photovoltaic module on the associated current link; and reporting each obtained current data to a processing device, so that the processing device receives a timestamp corresponding to the current data mark and stores the marked current data.
In a fourth aspect, a computer-readable storage medium is provided, in which instructions, when executed by an electronic device, enable the electronic device to perform the above-mentioned method.
The invention has the following beneficial effects:
in summary, in the embodiment of the present disclosure, a current sampling system of a photovoltaic module includes a current transformer, an access gateway, and a processing device, where the current transformer is configured to sample current data in a current link and transmit the current data associated with the current link to the access gateway, where the current link includes at least one photovoltaic module connected in series; the access gateway is used for receiving current data in each associated current link collected by at least one current transformer, taking the collected current data as a current measurement value of each photovoltaic module on the associated current link, and reporting the obtained current data to the processing equipment; the processing device is used for receiving and recording the current data of the corresponding current link reported by each access gateway, marking the corresponding timestamp corresponding to the current data and storing the marked current data. Like this, once only sampling is carried out to the current link through current transformer, has replaced the mode of traditional measurement photovoltaic module electric current, has realized nondestructive test on the basis that does not influence original circuit, has greatly reduced the power loss of current sampling, has improved the sampling efficiency and the sampling precision of electric current, has simplified measuring circuit, has reduced measurement cost, has greatly reduced the loss of electric energy.
Drawings
FIG. 1 is a schematic diagram of a current sampling system for a photovoltaic module according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a current link in an embodiment of the disclosure;
FIG. 3 is a schematic diagram of a current transformer in an embodiment of the present disclosure;
fig. 4 is a schematic flow chart of a current sampling method of a photovoltaic module according to an embodiment of the present disclosure;
fig. 5 is a schematic entity structure diagram of an access gateway in the embodiment of the present disclosure.
Detailed Description
In order to solve the problem that the current generated by the photovoltaic module cannot be safely measured under the lossless condition in the prior art, the current sampling system of the photovoltaic module is purposefully provided without current sampling in an intelligent junction box, so that the additional loss of electric energy caused by using a resistance sampling mode during current sampling is effectively avoided, and the interference to the normal work of the photovoltaic module is avoided.
In the embodiment of the disclosure, referring to fig. 1, the current sampling system of the photovoltaic module includes a current transformer 101, an access gateway 102, a processing device 103, and an intelligent junction box 104, where the intelligent junction box is associated with a corresponding photovoltaic module for outputting electric energy generated by the photovoltaic module, at least one intelligent junction box associated with the photovoltaic module is connected in series to form a current link, and the intelligent junction box does not sample current data.
In the following, each component involved in the current sampling system of the photovoltaic module in the embodiments of the present disclosure is described in detail with reference to the accompanying drawings.
(1) The current transformer 101 samples current data in a current link and transmits the current data associated with the current link to an access gateway, wherein the current link comprises at least one photovoltaic module connected in series.
In the embodiment of the disclosure, the electric energy generated by at least one photovoltaic module connected in series is output through the intelligent junction box, so that a corresponding current link is obtained, and then a current transformer is used for sampling at any position of the current link.
Specifically, a connection line of a secondary terminal of the current transformer is connected to an access gateway through a designated interface, and current data of the sampled current links are sent to the access gateway, wherein one current transformer correspondingly collects current data in one current link, one current link comprises at least one photovoltaic module connected in series, and different photovoltaic modules are connected in series through corresponding associated intelligent junction boxes 104.
For example, referring to fig. 2, a schematic illustration of a current link is shown, n photovoltaic modules connected in series through an intelligent junction box exist on the current link 1, electric energy generated by each photovoltaic module is transmitted out through the intelligent junction box to form the current link 1, and the number of the photovoltaic modules and the intelligent junction boxes related to the photovoltaic modules included in one current circuit may be configured according to actual configuration requirements, for example, n photovoltaic modules and intelligent junction boxes related to the photovoltaic modules may be configured.
In some embodiments of the present disclosure, the deployment position of the current transformer on the sampled current link is not fixed, and the current transformers on different current links are connected to the access gateway through an expandable interface, and send sampled current data to the access gateway.
It should be noted that, in the embodiment of the present disclosure, the proposed current transformer is specifically a dc current transformer, and referring to fig. 3, closed iron cores I and II of the current transformer are made of ferromagnetic materials (such as permalloy) with very high magnetic permeability, two primary coils are completely the same and are connected in series, where two secondary coils are completely the same and are connected in series in reverse direction through a dc current I1, and are connected to an auxiliary ac power supply through a bridge rectifier, and a current value to be measured can be obtained by measuring a current value output by the bridge rectifier.
In the current transformer, two secondary windings are oppositely connected, so that in each half period of the auxiliary alternating current I2 passing through the secondary windings, in one iron core, one secondary winding and the primary winding generate magnetic flux in opposite directions, and in the other iron core, one secondary winding and the primary winding generate magnetic flux in the same direction.
Since the installation and wiring process of the dc current transformer is a mature technology in the prior art, the present disclosure is not repeated herein.
(2) The access gateway 102 receives current data in each associated current link collected by at least one current transformer 101, uses the collected current data as a current measurement value of each photovoltaic module on the associated current link, and reports the obtained current data to the processing device 103.
Specifically, the access gateway 102 receives, through an extensible interface, current data on a current link correspondingly acquired by at least one current transformer 101, determines photovoltaic module information included in each current link, and uses the acquired current data sampled by the current transformer 101 as a current measurement value of each photovoltaic module on the current link.
In the embodiment of the present disclosure, the deployment position of the access gateway 102 is not fixed, and the access gateway 102 is configured with an expandable interface, and is connected with at least one current transformer through the expandable interface to obtain current data sampled by the current transformer. Preferably, the access gateway 102 may be disposed near an inverter that inverts the current on the current link, so that the access gateway 102 can obtain current data of a plurality of different current links conveniently.
It should be noted that, in the embodiment of the present disclosure, since each photovoltaic module in a current link is connected in series, for one current link, the current value in the current link is not affected by the current sampling position, so that the current data in the current link sampled by the current transformer at the deployed position can be used as the current measurement value of each photovoltaic module connected in series on the current link.
Therefore, on one hand, the current data measuring mode of the photovoltaic module is changed, on the other hand, the isolation characteristic of the current transformer is used, the safety of the sampling process is guaranteed, and the influence on the original operation circuit is avoided.
Further, the access gateway 102 processes the obtained current data corresponding to different current links according to a specified data format, and transmits and reports the processed current data to the processing device 103, so that the processing device 103 can perform analysis processing based on the obtained current data.
In some embodiments of the present disclosure, the access gateway 102 receives the operation data reported by each intelligent junction box 104, uses the operation data and the measured current value corresponding to the photovoltaic module associated with the intelligent junction box 104 as the sampling data of each corresponding photovoltaic module, processes the obtained sampling data of each corresponding photovoltaic module according to a specified data format, and reports the processed sampling data to the processing device 103.
Specifically, after receiving the operation data of the associated photovoltaic module sent by each intelligent junction box, the access gateway 102 obtains the received current data on the current link where the photovoltaic module is located, uses the current data as the current measurement value of the photovoltaic module, associates the current measurement value with the voltage data and the temperature data as the sampling data of the photovoltaic module, processes the sampling data according to a specified data format, and transmits the sampling data to the processing device 103.
It should be noted that, in the embodiment of the present disclosure, the time when the access gateway reports the sampling data to the processing device may be when the current data of the photovoltaic module is received, or when other operation data is reported immediately, or when a specified time length is used as a period, the received data is reported.
Therefore, the wiring gateway is arranged on the current transformer of the current link, the current is detected only at one position on the current link, the sampling position of the current data of the photovoltaic module is changed, the intelligent junction box is not needed to be used for current sampling, the electric energy loss caused by the mode of resistance sampling when the intelligent junction box is used for current sampling is effectively avoided, and the stability and the high efficiency of the current link are improved while the original wiring mode of the photovoltaic module is not changed.
(3) The processing device 103 receives and records the current data of the corresponding current link reported by each access gateway 102, marks a corresponding timestamp corresponding to the current data, and stores the marked current data.
Specifically, in some embodiments of the present disclosure, after receiving the current data of the corresponding current link reported by each access gateway 102, the processing device identifies the current data included in the data in the specified data format sent by each access gateway, determines the current time of receiving the current data, marks a corresponding timestamp for the received current data, and further stores the marked current data.
In other embodiments of the present disclosure, the processing device 103 receives sampling data of each photovoltaic module sent by the access gateway, marks a corresponding timestamp for each processing sampling data, and stores each marked sampling data. The sampled data includes current measurements, voltage data, and temperature data.
Further, the processing device 103 obtains data associated with the photovoltaic modules at different time stamps, and analyzes the operating conditions of the corresponding photovoltaic modules based on the associated data. The associated data includes current measurements, voltage data, and temperature data for different photovoltaic modules that are pre-stored by the processing device.
For example, the processing device may obtain current measurement values and voltage data sampled at different time points, analyze the operating conditions of the photovoltaic modules, and analyze changes in the current data and the voltage data of a certain photovoltaic module.
In some embodiments of the present disclosure, the processing device 103 obtains stored sampling data associated with each photovoltaic module and marked with a timestamp recorded latest, screens out a photovoltaic module of which the temperature data in the sampling data exceeds a preset temperature threshold value, uses the screened photovoltaic module as an abnormal photovoltaic module, and displays corresponding abnormal information.
In order to determine the operating condition of the current photovoltaic module, the processing device may determine whether the photovoltaic module is abnormal according to the stored sampling data of each photovoltaic module marked with the latest recorded timestamp, specifically, may set a corresponding temperature threshold value for the temperature data, screen out the photovoltaic modules whose temperature data exceed the temperature threshold value as abnormal photovoltaic modules, and display specific information of the abnormal photovoltaic modules.
For example, the processing device determines that the current measurement value of the photovoltaic module 1 which is recorded most recently is 1.5A, the voltage data at two ends of the photovoltaic module is 15V, the current temperature data is 50 ℃, and the set temperature threshold value is 45 ℃, so that it can be known that the temperature data in the operation data of the photovoltaic module 1 exceeds the set threshold value, and therefore, the photovoltaic module 1 is an abnormal photovoltaic module, and it is necessary to display that the photovoltaic module 1 is abnormal currently, and display information such as a current link where the photovoltaic module 1 is located.
(4) The intelligent junction box 104 outputs the electric energy generated by the associated photovoltaic module and is connected with other intelligent junction boxes in series to form a current link; collecting operation data of the photovoltaic module, and reporting the operation data to the access gateway, wherein the operation data comprises voltage data and temperature data of the photovoltaic module.
The intelligent junction box 104 is correspondingly installed with the photovoltaic modules associated with the intelligent junction box, different photovoltaic modules are connected in series by means of the intelligent junction box, the intelligent junction box can output electric energy generated by the photovoltaic modules and collect voltage data and temperature data of the associated photovoltaic modules, the intelligent junction box does not sample current data of the associated photovoltaic modules, and one intelligent junction box is associated with one photovoltaic module.
In the embodiment of the disclosure, at least one intelligent junction box exists on one current link, and the intelligent junction box transmits the acquired voltage data and temperature data to the access gateway in a wired transmission or wireless transmission mode.
It should be noted that, in the implementation of the present disclosure, each intelligent junction box associated with a photovoltaic module may be used as each node on a current link, each node is equivalent to each dc power supply, the whole current link may be regarded as being formed by connecting each dc power supply in series, each node has a corresponding positive terminal and a corresponding negative terminal, a node which is not connected with other nodes and is directly connected to an inverter in the following process of the positive terminal may be used as a sink node, and then, optionally, a current transformer is disposed on a transmission line between the sink node and the inverter.
Therefore, current sampling is not carried out at the original intelligent junction box, nondestructive detection of current data of the photovoltaic module is realized, sampling power consumption is greatly reduced, electric energy loss generated at each original node in a current link is saved, and the power generation efficiency of the photovoltaic module is improved to a certain extent.
The following describes a current sampling method of a photovoltaic module according to the present disclosure from the perspective of an access gateway, with reference to fig. 4:
step 401: the method comprises the steps of receiving current data in each associated current link collected by at least one current transformer, and using the collected current data as current measurement values of each photovoltaic module on the associated current link.
Specifically, the current transformer is deployed on a current link formed by at least one photovoltaic module connected in series, and is used for sampling current data on the current link and taking the current data as a current measurement value of each photovoltaic module on the current link. The deployment position of the current transformers is not fixed, and one current transformer is used for sampling current data of one current link.
Step 402: and reporting each obtained current data to a processing device, so that the processing device receives a timestamp corresponding to the current data mark and stores the marked current data.
After current data acquired by the current transformer are acquired through the extensible interface, the acquired current data are reported to the processing equipment so that the processing equipment can receive the corresponding current data, and the corresponding timestamp is marked for the current data so as to be used for subsequent analysis and processing.
Based on the same inventive concept, referring to fig. 5, the present application provides an electronic device comprising a processor 502 and a memory 501, wherein,
the processor 502 is configured to read the instructions in the memory 501 and perform the following operations:
receiving current data in each associated current link collected by at least one current transformer, and taking the collected current data as current measurement values of each photovoltaic module on the associated current link; and reporting each obtained current data to a processing device, so that the processing device receives a timestamp corresponding to the current data mark and stores the marked current data.
Based on the same inventive concept, the disclosed embodiments provide a computer-readable storage medium, wherein when executed by an electronic device, instructions of the computer-readable storage medium enable the electronic device to perform receiving current data collected by at least one current transformer in each associated current link, and using the collected current data as current measurement values of each photovoltaic module on the associated current link; and reporting each obtained current data to a processing device, so that the processing device receives a timestamp corresponding to the current data mark and stores the marked current data.
In summary, in the embodiment of the present disclosure, a current sampling system of a photovoltaic module includes a current transformer, an access gateway, and a processing device, where the current transformer is configured to sample current data in a current link and transmit the current data associated with the current link to the access gateway, where the current link includes at least one photovoltaic module connected in series; the access gateway is used for receiving current data in each associated current link collected by at least one current transformer, taking the collected current data as a current measurement value of each photovoltaic module on the associated current link, and reporting the obtained current data to the processing equipment; the processing device is used for receiving and recording the current data of the corresponding current link reported by each access gateway, marking the corresponding timestamp corresponding to the current data and storing the marked current data. Like this, once only sampling is carried out to the current link through current transformer, has replaced the mode of traditional measurement photovoltaic module electric current, has realized nondestructive test on the basis that does not influence original circuit, has greatly reduced the power loss of current sampling, has improved the sampling efficiency and the sampling precision of electric current, has simplified measuring circuit, has reduced measurement cost, has greatly reduced the loss of electric energy.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (10)
1. A current sampling system for a photovoltaic module, comprising:
the current transformer is used for sampling current data in a current link and transmitting the current data related to the current link to an access gateway, wherein the current link comprises at least one photovoltaic assembly connected in series;
the access gateway is used for receiving current data in each associated current link collected by at least one current transformer, taking the collected current data as a current measurement value of each photovoltaic module on the associated current link, and reporting the obtained current data to the processing equipment;
and the processing equipment receives and records the current data of the corresponding current link reported by each access gateway, marks a corresponding timestamp corresponding to the current data and stores the marked current data.
2. The system of claim 1, wherein the current sampling system further comprises an intelligent junction box to:
outputting electric energy generated by the associated photovoltaic module, and connecting the electric energy with other intelligent junction boxes in series to form a current link;
collecting operation data of the photovoltaic module, and reporting the operation data to the access gateway, wherein the operation data comprises voltage data and temperature data of the photovoltaic module.
3. The system of claim 2, wherein the access gateway is further to:
receiving operation data reported by each intelligent junction box, and taking the operation data and a measured current value corresponding to the photovoltaic module associated with the intelligent junction box as sampling data of each corresponding photovoltaic module;
and processing the obtained sampling data of each corresponding photovoltaic module according to a specified data format, and reporting the processed sampling data to the processing equipment.
4. The system of claim 3, wherein the processing device is further to:
receiving sampling data of each photovoltaic module sent by an access gateway, marking corresponding time stamps for the sampling data and storing the marked sampling data.
5. The system of claim 1 or 4, wherein the processing device further comprises:
and acquiring data associated with the photovoltaic modules under different timestamps, and analyzing the operating conditions of the corresponding photovoltaic modules based on the associated data.
6. The system of claim 4, wherein the processing device is further to:
acquiring stored sampling data which are marked with latest recorded timestamps and are related to each photovoltaic assembly;
and screening out the photovoltaic modules of which the temperature data in the sampling data exceed a preset temperature threshold value, taking the screened photovoltaic modules as abnormal photovoltaic modules, and displaying corresponding abnormal information.
7. The system of any one of claims 1-4, further comprising:
the deployment positions of the access gateway and the current transformers are not fixed, the access gateway is connected with at least one current transformer through an extensible interface, and current data sampled by the at least one current transformer are received.
8. A current sampling method of a photovoltaic module is characterized by comprising the following steps:
receiving current data in each associated current link collected by at least one current transformer, and taking the collected current data as current measurement values of each photovoltaic module on the associated current link;
and reporting each obtained current data to a processing device, so that the processing device receives a timestamp corresponding to the current data mark and stores the marked current data.
9. An electronic device, comprising:
a memory for storing executable instructions;
the processor is used for reading and executing the executable instructions stored in the memory so as to receive the current data in the respective associated current link collected by at least one current transformer and take the collected current data as the current measurement value of each photovoltaic module on the associated current link; and reporting each obtained current data to a processing device, so that the processing device receives a timestamp corresponding to the current data mark and stores the marked current data.
10. A computer-readable storage medium, wherein instructions in the computer-readable storage medium, when executed by an electronic device, enable the electronic device to perform the method recited in claim 1.
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| CN202010949188.XA CN112198359A (en) | 2020-09-10 | 2020-09-10 | Current sampling system and method of photovoltaic module |
| PCT/CN2020/115076 WO2022052105A1 (en) | 2020-09-10 | 2020-09-14 | Current sampling system and method for photovoltaic modules |
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