CN112367049A - Photovoltaic power station I-V curve testing device and method - Google Patents
Photovoltaic power station I-V curve testing device and method Download PDFInfo
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- 239000000126 substance Substances 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 11
- 238000001514 detection method Methods 0.000 abstract description 10
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- 238000004590 computer program Methods 0.000 description 7
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- 230000000712 assembly Effects 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The invention provides a photovoltaic power station I-V curve testing device and method, wherein the device comprises: the gang switch with photovoltaic power plant group cluster one-to-one, I-V curve tester, the gang switch include: a first switch and a second switch; when the photovoltaic power station normally works, the second switch is disconnected, and the first switch is closed, so that the photovoltaic group string corresponding to the linkage switch is connected to the photovoltaic power station to enable the photovoltaic power station to normally work; and during the I-V curve test, the first switch is opened, and the second switch is closed, so that the photovoltaic group string corresponding to the ganged switch is connected to the I-V curve tester for the I-V curve test. The invention solves the problems that the I-V curve test can not be carried out under the condition of gradual normal power generation and the I-V curve detection needs to be carried out off line in the prior art, and carries out the I-V curve test on the photovoltaic power station of the stock, thereby realizing the fine management of the photovoltaic power station and keeping the power station with better profit margin.
Description
Technical Field
The invention relates to the power technology, in particular to a photovoltaic power station I-V curve testing device and method.
Background
In the prior art, the photovoltaic investment high-return stage can not return once, and only a power station which is managed finely can keep a better profit margin. The photovoltaic IV curve test is a fine and accurate photovoltaic module and string power generation performance test means, whether a tested object has a fault or not can be directly analyzed and the fault type can be preliminarily determined by comparing the IV curves of the tested object, and the photovoltaic IV curve test is a commonly accepted photovoltaic power generation performance test means at present.
According to the photovoltaic IV curve test principle, the photovoltaic output voltage needs to be controlled to be increased from 0 to the open-circuit voltage, so that the test cannot be performed under the condition of gradual normal power generation, and the off-line detection is needed. The IV test method in the prior art is manual test, the process is that a tester carries an IV detector, 1-5% of assemblies or groups are selected, a tested sample is disassembled, the IV test is sequentially carried out, and a technician carries out data analysis after data are obtained. The method has the advantages of low detection efficiency, high cost, long period and large electric quantity loss. In the prior art, some inverter manufacturers have introduced an intelligent photovoltaic inverter capable of measuring an IV curve of a photovoltaic string in recent two years, and the IV curve is obtained by controlling a dc bus voltage through a control strategy inside a home inverter. However, this solution is limited to inverters from inverter manufacturers and is generally limited to string inverters.
Disclosure of Invention
In order to perform an I-V curve test on a stock of photovoltaic power stations, an embodiment of the present invention provides an I-V curve test apparatus for a photovoltaic power station, including: the gang switch with photovoltaic power plant group cluster one-to-one, I-V curve tester, the gang switch include: a first switch and a second switch; wherein the content of the first and second substances,
when the photovoltaic power station normally works, the second switch is disconnected, and the first switch is closed, so that the photovoltaic group string corresponding to the linkage switch is connected to the photovoltaic power station to enable the photovoltaic power station to normally work;
and during the I-V curve test, the first switch is opened, and the second switch is closed, so that the photovoltaic group string corresponding to the ganged switch is connected to the I-V curve tester for the I-V curve test.
In the embodiment of the invention, the photovoltaic power station I-V curve testing device further comprises:
and the data transmission device is in communication connection with the I-V curve tester and is used for transmitting the I-V curve test generated by the I-V curve tester to external equipment.
In the embodiment of the invention, the photovoltaic power station I-V curve testing device is arranged on the serial side of the direct current combiner box group of the centralized inverter photovoltaic power station.
In the embodiment of the invention, the photovoltaic power station I-V curve testing device is arranged on the direct current side of the string inverter of the photovoltaic power station of the string inverter.
In the embodiment of the invention, one end of the first switch is connected to the photovoltaic group string corresponding to the linkage switch where the first switch is located, and when the photovoltaic power station works normally, the other end of the first switch is connected to the junction box of the photovoltaic power station.
In the embodiment of the invention, one end of the second switch is connected to the photovoltaic group string corresponding to the linkage switch where the second switch is located, and when an I-V curve is tested, the other end of the second switch is connected to the closed switch of the I-V curve tester.
Meanwhile, the invention also provides a photovoltaic power station I-V curve testing method, which utilizes the photovoltaic power station I-V curve testing device to carry out I-V curve testing;
and controlling the linkage switch to connect the I-V curve tester with each group of strings of the photovoltaic power station, and carrying out I-V curve test on each group of strings.
The invention provides an I-V curve testing device, which solves the problems that the testing can not be carried out under the condition of gradual normal power generation and the I-V curve detection needs to be carried out off line in the prior art, provides an accurate photovoltaic module and string power generation performance testing means, and carries out the I-V curve testing on the photovoltaic power station of the stock to solve the problems of intelligent detection and lean operation and maintenance of photovoltaic strings and modules in a photovoltaic power generation enrichment area, thereby realizing the fine management of the photovoltaic power station and keeping the power station at a better profit margin.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of an I-V curve testing device for a photovoltaic power station provided by the invention;
FIG. 2 is a schematic diagram of an automatic detection of an I-V curve of a photovoltaic string provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of an I-V curve tester provided in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the present invention provides a photovoltaic power station I-V curve testing apparatus, which includes: the ganged switch 101 and the I-V curve tester 102 are in one-to-one correspondence with the photovoltaic power station group strings, and the ganged switch comprises: a first switch and a second switch; wherein the content of the first and second substances,
when the photovoltaic power station normally works, the second switch is disconnected, and the first switch is closed, so that the photovoltaic group string corresponding to the linkage switch is connected to the photovoltaic power station to enable the photovoltaic power station to normally work;
and during the I-V curve test, the first switch is opened, and the second switch is closed, so that the photovoltaic group string corresponding to the ganged switch is connected to the I-V curve tester for the I-V curve test.
According to the photovoltaic power station I-V curve testing device provided by the invention, the I-V curve tester is connected to the photovoltaic power station through the linked switch, the I-V curve test is carried out on the group string of the photovoltaic power station, the problem that the I-V curve test cannot be carried out under the normal power generation condition due to the fact that the offline test is required in the prior art is solved, the group string connected with the I-V curve tester is switched through switching and controlling the linked switch, the automatic test on the group string of the photovoltaic power grid is realized, the tested sample does not need to be manually disassembled, the linked switch is controlled to carry out the IV test in sequence, and the problems of low detection efficiency, high cost, long period and large electric quantity loss in the prior art are solved.
The technical solution of the present invention is further described in detail with reference to the following specific examples.
The embodiment of the invention mainly solves the problems of intelligent detection and lean operation and maintenance of photovoltaic strings and components in photovoltaic power generation enrichment areas; the photovoltaic power station is mainly oriented to the object storage and adopts a centralized and string inversion mode.
In this embodiment, an I-V curve test is performed on a photovoltaic power station by adding an I-V curve automatic test device, that is, the photovoltaic power station I-V curve test apparatus of the present invention.
In the embodiment of the invention, the photovoltaic power station I-V curve testing device is arranged on the serial side of the direct current combiner box group of the centralized inverter photovoltaic power station.
In the embodiment of the invention, the photovoltaic power station I-V curve testing device is arranged on the direct current side of the string inverter of the photovoltaic power station of the string inverter.
For a photovoltaic power station adopting a centralized inverter, I-V curve automatic test equipment is arranged on the serial side of a direct current combiner box group, and in one embodiment of the invention, 4 adjacent combiner boxes share one I-V curve automatic test equipment, namely, an I-V curve test device of the photovoltaic power station;
that is, for a photovoltaic power station using a string inverter, an I-V curve automatic test device is installed on the dc side of the string inverter, and in this embodiment, the adjacent 4 string inverters share the I-V curve automatic test device, that is, the photovoltaic power station I-V curve test device of the present invention.
The structure of the I-V curve automatic test equipment provided by this embodiment is shown in fig. 2, and includes: the intelligent linkage switch, the I-V curve tester and the data transmission device.
In this embodiment, intelligent gang switch includes: s1 and L1, S2 and L2 … … Sn and Ln; wherein, S1 and L1, S2 and L2 … … Sn and Ln are a pair of linked switches, that is, the linked switches include: a first switch and a second switch. S1 and L1, S2 and L2 … … Sn and Ln respectively correspond to 1-1# string and 1-2# string; s1 and S2 … … Sn are switches connected in series to the photovoltaic power station; l1 and L2 … … Ln are switches connected with the I-V tester, and are also different positions of the I-V tester switches connected with the groups of strings, and a pair of linkage switches must be kept in a state of closing and opening.
When the photovoltaic power station normally works, one end of the first switch is connected to the photovoltaic group string corresponding to the linkage switch where the first switch is located, and the other end of the first switch is connected to the junction box of the photovoltaic power station.
And during the I-V curve test, one end of the second switch is connected to the photovoltaic group string corresponding to the linkage switch where the second switch is located, and the other end of the second switch is connected to the closing switch of the I-V curve tester.
The specific working process of the automatic I-V curve testing device provided by this embodiment is divided into the following stages:
1. when photovoltaic power plant normally generated electricity, each group of cluster and the switch of collection flow box were connected in the intelligent gang switch: S1-S are in a closed state, and each group of strings generates electricity normally;
2. when the I-V curve test is carried out, the intelligent linkage switch carries out the I-V curve test once according to a preset detection period, such as 1 week or 3 days, and enters a group string I-V curve test stage; in the test process, I-V curve test is sequentially carried out on the photovoltaic group strings of the 1# -n # strings, in the embodiment, the test on one group of strings takes 30s, and when one group of strings is tested, other groups of strings are in a normal grid-connected power generation state; the specific switching sequence is shown in table 1.
TABLE 1 switch states during the test
3. After the test is completed, the data transmission device 103 stores the I-V test data, and uploads the test data to the power station data system each time through the in-station communication network or wireless transmission, or copies the test data from the device body at regular time.
In this embodiment, the structure of the I-V curve tester is shown in fig. 3, and includes: capacitive load, current sensor (precision CT) and voltage sensor (precision PT).
After the test is started, the closed switch K is connected with the corresponding group string through L1 and L2 … … Ln, and the two sensors detect the magnitude of the charging current in the process that the voltage borne by the capacitive load is from 0 to the open-circuit voltage of the group string to form an I-V test curve; and (3) testing an I-V curve for about 2-5 s, and after the test is finished, the switch K is switched off, so that the capacitive load automatically discharges.
Meanwhile, the invention also provides a photovoltaic power station I-V curve testing method, which utilizes the photovoltaic power station I-V curve testing device to carry out I-V curve testing;
and controlling the linkage switch to connect the I-V curve tester with each group of strings of the photovoltaic power station, and carrying out I-V curve test on each group of strings.
According to the photovoltaic power station I-V curve testing device provided by the invention, the I-V curve tester is connected to the photovoltaic power station through the linked switch, the I-V curve test is carried out on the group string of the photovoltaic power station, the problem that the I-V curve test cannot be carried out under the normal power generation condition due to the fact that the offline test is required in the prior art is solved, the group string connected with the I-V curve tester is switched through switching and controlling the linked switch, the automatic test on the group string of the photovoltaic power grid is realized, the tested sample does not need to be manually disassembled, the linked switch is controlled to carry out the IV test in sequence, and the problems of low detection efficiency, high cost, long period and large electric quantity loss in the prior art are solved.
The preferred embodiments of the present invention have been described above with reference to the accompanying drawings. The many features and advantages of the embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the embodiments that fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the invention to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.
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.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (7)
1. A photovoltaic power plant I-V curve testing arrangement which characterized in that, the device includes: the gang switch with photovoltaic power plant group cluster one-to-one, I-V curve tester, the gang switch include: a first switch and a second switch; wherein the content of the first and second substances,
when the photovoltaic power station normally works, the second switch is disconnected, and the first switch is closed, so that the photovoltaic group string corresponding to the linkage switch is connected to the photovoltaic power station to enable the photovoltaic power station to normally work;
and during the I-V curve test, the first switch is opened, and the second switch is closed, so that the photovoltaic group string corresponding to the ganged switch is connected to the I-V curve tester for the I-V curve test.
2. The photovoltaic power plant I-V curve testing apparatus of claim 1, wherein said photovoltaic power plant I-V curve testing apparatus further comprises:
and the data transmission device is in communication connection with the I-V curve tester and is used for transmitting the I-V curve test generated by the I-V curve tester to external equipment.
3. The photovoltaic power plant I-V curve testing apparatus of claim 1, wherein the photovoltaic power plant I-V curve testing apparatus is disposed on a string side of a dc combiner box group of a centralized inverter photovoltaic power plant.
4. The photovoltaic power plant I-V curve testing apparatus of claim 1, wherein the photovoltaic power plant I-V curve testing apparatus is disposed on a string inverter dc side of a photovoltaic power plant of the string inverter.
5. The I-V curve testing device of the photovoltaic power station as recited in claim 1, wherein one end of the first switch is connected to the photovoltaic string corresponding to the ganged switch where the first switch is located, and when the photovoltaic power station normally works, the other end of the first switch is connected to the combiner box of the photovoltaic power station.
6. The I-V curve testing device of the photovoltaic power station as claimed in claim 1, wherein one end of the second switch is connected to the photovoltaic string corresponding to the ganged switch where the second switch is located, and when the I-V curve is tested, the other end of the second switch is connected to the closed switch of the I-V curve tester.
7. A photovoltaic power station I-V curve testing method is characterized in that the method utilizes the photovoltaic power station I-V curve testing device of any one of claims 1-6 to carry out I-V curve testing;
and controlling the linkage switch to connect the I-V curve tester with each group of strings of the photovoltaic power station, and carrying out I-V curve test on each group of strings.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022156619A1 (en) * | 2021-01-20 | 2022-07-28 | 浙江英达威芯电子有限公司 | Detection device for photovoltaic assembly |
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| CN105553421A (en) * | 2015-12-02 | 2016-05-04 | 蚌埠电子信息产业技术研究院 | Photovoltaic power generation system online IV curve test device and test method |
| CN105703710A (en) * | 2014-11-28 | 2016-06-22 | 中电电气(上海)太阳能科技有限公司 | EL test circuit with protective component |
| KR102080811B1 (en) * | 2019-10-31 | 2020-05-26 | 주식회사 한국이알이시 | Photovoltaic junction box with fire complex sensing function and control method thereof |
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2020
- 2020-11-09 CN CN202011237475.4A patent/CN112367049A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703710A (en) * | 2014-11-28 | 2016-06-22 | 中电电气(上海)太阳能科技有限公司 | EL test circuit with protective component |
| CN105553421A (en) * | 2015-12-02 | 2016-05-04 | 蚌埠电子信息产业技术研究院 | Photovoltaic power generation system online IV curve test device and test method |
| KR102080811B1 (en) * | 2019-10-31 | 2020-05-26 | 주식회사 한국이알이시 | Photovoltaic junction box with fire complex sensing function and control method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2022156619A1 (en) * | 2021-01-20 | 2022-07-28 | 浙江英达威芯电子有限公司 | Detection device for photovoltaic assembly |
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Application publication date: 20210212 |