CN117148064A - Photovoltaic direct current fault arc testing system and method - Google Patents
Photovoltaic direct current fault arc testing system and method Download PDFInfo
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- CN117148064A CN117148064A CN202311123719.XA CN202311123719A CN117148064A CN 117148064 A CN117148064 A CN 117148064A CN 202311123719 A CN202311123719 A CN 202311123719A CN 117148064 A CN117148064 A CN 117148064A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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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 application discloses a photovoltaic direct current fault arc test system and a method, wherein the system comprises a control end, and a direct current power supply generator, a fault arc generator and a photovoltaic inverter which are respectively in communication connection with the control end; the fault arc generator is respectively and electrically connected with the photovoltaic inverter and a product to be tested; the direct-current power supply generator is electrically connected with the photovoltaic inverter and the product to be tested respectively; the photovoltaic inverter is used for accessing a power grid; the control end controls the fault arc generator to generate a fault arc signal based on a preset test mode, and judges whether the product to be tested is qualified or not by receiving a feedback signal of the product to be tested. The application fills the blank in the field of fault arc testing and realizes the arc protection performance test of direct current fault arc protection products for direct current and photovoltaic power generation systems. In addition, the test system provided by the application has the advantages of simple structure, easiness in operation and capability of accurately simulating a standard fault arc, so that the test precision is improved.
Description
Technical Field
The application relates to the technical field of direct current fault arc testing, in particular to a photovoltaic direct current fault arc testing system and method.
Background
With the global strong popularization of photovoltaic and new energy products, the photovoltaic products are used in a large area at present, and faults such as breakdown short circuit, contact point looseness, line aging and the like are caused by contact looseness and equipment aging brought about by links such as photovoltaic panels, power transmission and distribution lines and the like, so that a large number of electrical appliance fire accidents occur. In order to better prevent the fire accident caused by arc faults, the method is used for avoiding the fire accident caused by arc faults. For example, the national market supervision administration and the national standardization management committee jointly issue the standard GB/T397550-2021, and the technical requirements for direct current arc protection of a photovoltaic power generation system are given to related specification requirements for products such as fault arc protectors and the like.
However, no device for testing direct current and photovoltaic direct current fault arcs exists in the market, and the device is used for filling the blank in the field and realizing the arc protection performance test of direct current fault arc protection products for direct current and photovoltaic power generation systems.
Disclosure of Invention
The application mainly aims to provide a photovoltaic direct current fault arc testing system and method, and aims to solve the technical problem that no equipment for testing direct current and photovoltaic direct current fault arcs exists in the market.
In order to achieve the aim, the application discloses a photovoltaic direct current fault arc testing system which comprises a control end, a direct current power supply generator, a fault arc generator and a photovoltaic inverter, wherein the direct current power supply generator, the fault arc generator and the photovoltaic inverter are respectively in communication connection with the control end; the fault arc generator is respectively and electrically connected with the photovoltaic inverter and a product to be tested; the direct-current power supply generator is respectively and electrically connected with the photovoltaic inverter and a product to be tested; the photovoltaic inverter is used for accessing a power grid; the control end controls the fault arc generator to generate a fault arc signal based on a preset test mode, and judges whether the product to be tested is qualified or not by receiving a feedback signal of the product to be tested.
Further, the fault arc generator comprises a base, and a fixed pole and a movable pole which are oppositely arranged on the base, wherein the movable pole can be close to or far away from the fixed pole through a movable component so as to control the generated fault arc signal.
Further, the fault arc generator further comprises a speed changing component arranged on the base, and the speed changing component is connected with the moving component to adjust the speed of the moving component.
Further, the fixed pole comprises a first installation seat and a first conductive rod arranged on the first installation seat, and the end face of the first conductive rod, which is close to one end of the movable pole, forms a planar arc generating end.
Further, the movable electrode comprises a second mounting seat and a second conductive rod arranged on the second mounting seat, and one end face of the second conductive rod, which is close to the fixed electrode, forms a spherical arc generating end.
Further, the moving assembly is a servo motor.
Further, the speed change assembly is a transmission.
Further, the first conductive rod is a T2 copper rod.
Further, the second conductive rod is a carbon-graphite rod.
The application also discloses a photovoltaic direct current fault arc test method, which is applied to the photovoltaic direct current fault arc test system and comprises the following steps:
s1, providing a direct current power generator to generate standard direct current and direct voltage, and then connecting the standard direct current power generator to a product to be tested;
s2, providing a fault arc generator to generate a fault arc signal in the circuit;
s3, providing a photovoltaic inverter to integrate the direct current voltage and direct current passing through the fault arc generator into a power grid;
and S4, providing a control end, controlling the fault arc generator to generate a fault arc signal based on a preset test mode, and judging whether the product to be tested is qualified or not by receiving a feedback signal of the product to be tested.
Compared with the prior art, the application has the beneficial effects that:
the application fills the blank in the field of fault arc testing and realizes the arc protection performance test of direct current fault arc protection products for direct current and photovoltaic power generation systems. In addition, the test system provided by the application has the advantages of simple structure, easiness in operation and capability of accurately simulating a standard fault arc, so that the test precision is improved.
Drawings
FIG. 1 is a block diagram of a photovoltaic DC fault arc testing system according to an embodiment of the present application;
FIG. 2 is a circuit control diagram of a photovoltaic DC fault arc testing system according to an embodiment of the present application;
FIG. 3 is a perspective view of a fault arc generator according to an embodiment of the present application;
FIG. 4 is a front view of the control cabinet according to the embodiment of the application;
fig. 5 is a flowchart of a photovoltaic dc fault arc testing method according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below are exemplary and intended to illustrate the present application and should not be construed as limiting the application, and all other embodiments, based on the embodiments of the present application, which may be obtained by persons of ordinary skill in the art without inventive effort, are within the scope of the present application.
Since there is no device on the market that tests for dc, photovoltaic dc fault arcs. In order to solve the technical problems, the application provides a photovoltaic direct current fault arc testing system and a method.
Referring to fig. 1 and 2, the embodiment of the application discloses a photovoltaic direct current fault arc test system, which comprises a control end 1, a direct current power generator 2, a fault arc generator 3 and a photovoltaic inverter 4, wherein the direct current power generator 2, the fault arc generator 3 and the photovoltaic inverter 4 are respectively in communication connection with the control end 1, the fault arc generator 2 is respectively and electrically connected with the photovoltaic inverter 4 and a product 5 to be tested, the direct current power generator 3 is respectively and electrically connected with the photovoltaic inverter 4 and the product 5 to be tested, the photovoltaic inverter 4 is used for being connected with a power grid, the control end 1 controls the fault arc generator 3 to generate fault arc signals based on a preset test mode, and whether the product to be tested is qualified or not is judged by receiving feedback signals of the product 5 to be tested.
The system in this embodiment controls the fault arc generator 3 through the control end 1, and under the cooperation of the standard dc power generator 2 and the photovoltaic inverter 4 serving as a standard load, the system can simulate the fault arc of the accurate dc photovoltaic system caused by poor wire contactors, short circuit of lines and other reasons in real time, so as to realize the test of the arc protection function of the product 5 to be tested under the above conditions.
It can be understood that the control terminal 1 comprises a man-machine interface operation interface of TPC1571Gn and a SIMATIC S7-1200SMART program control system matched with the man-machine interface operation interface; in actual testing, the preset test mode refers to five test schemes conforming to the national standard GB/T3979-2010, and the test mode comprises the following steps: d.1 (series group series line structure), d.2 (parallel group series line structure), d.3 (module level series group series line structure), d.4 (module level parallel group series line structure), d.5 (group series line structure including bus box), the SIMATIC S7-1200SMART program control system is started through TPC1571Gn man-machine interface operation interface, and the system will automatically complete tracking test.
Specifically, in the d.1 scheme: two groups of direct current power supply generators are connected to a power grid in a serial mode, fault arc signals are connected in a serial loop, and serial arcs are tested.
In the scheme D.2, three groups of direct current power supply generators are adopted, two groups of direct current power supply generators are connected in series and then the same group of direct current power supply generators are connected to a power grid in parallel, fault arc signals are connected in a series loop, and parallel arcs are tested.
In the D.3 scheme, a group of direct current power supply generators are connected to a power grid in a serial mode, fault arc signals are connected in a serial loop, and serial arcs are tested.
In the scheme D.4, three groups of direct current power supply generators are adopted, one group of direct current power supply generators are connected in series and then connected with a power grid in parallel with two groups of direct current power supply generators, fault arc signals are connected in a series loop, and parallel arcs are tested.
In the scheme D.5, three groups of direct current power supply generators are adopted, two groups of direct current power supply generators are connected in series and then the same group of direct current power supply generators are connected to a combiner box (not labeled in the figure) in parallel, a 2X 40 meter cable is connected in series at the output end of the combiner box, fault arc signals are connected in series at the tail end of the cable, and series-parallel hybrid arcs are tested.
The SIMATIC S7-1200SMART program control system comprises an integrated CPU-ST1200 module, an EM-QT16 module and an EM-AM06 module.
Referring to fig. 3, in the present embodiment, the fault arc generator 3 includes a base 31, and a fixed pole 32 and a movable pole 33 disposed opposite to the base 31, and the movable pole 33 may be moved toward or away from the fixed pole 32 by a moving assembly 34 to control a generated fault arc signal.
It will be appreciated that, to improve the accuracy of the control, the moving assembly 34 in this embodiment is a servo motor that can be precisely controlled by a program, so that the purpose of precisely adjusting the magnitude of the arc signal is achieved by controlling the speed at which the moving pole 33 moves toward the fixed pole 32, so that the generated fault arc signal is completely consistent with the actual fault arc signal. In addition, the base 31 is a 3240 epoxy base having a thickness of 50mm to ensure insulation performance of the system as a whole.
In this embodiment, the fault arc generator 3 further comprises a speed changing assembly 35 disposed on the base 31, and the speed changing assembly 35 is connected to the moving assembly 34 to adjust the speed of the moving assembly 34. It will be appreciated that in this embodiment, the speed change assembly 35 is a transmission that can further precisely control the speed at which the moving pole 33 moves toward the stationary pole 32 via the moving assembly 34.
In this embodiment, the fixed pole 32 includes a first mounting base 321 and a first conductive rod 322 disposed on the first mounting base 321, where the first conductive rod 322 forms a planar arc generating end 323 near an end surface of the movable pole 33. It will be appreciated that the first mounting base 321 is provided with a first mounting hole (not shown) for fixing and adjusting the first conductive rod 322 to an optimal operating position.
In this embodiment, the movable electrode 33 includes a second mounting seat 331, and a second conductive rod 332 disposed on the second mounting seat 331, where an end surface of the second conductive rod 332 near the fixed electrode 32 forms a spherical arc generating end 333, and a half-diameter of the spherical arc generating end 333 is 3.2mm. It will be appreciated that the second mounting base 331 is provided with a second mounting hole (not shown) for fixing and adjusting the second conductive rod 332 to an optimal operating position, i.e. on the same axis as the first conductive rod 322.
In this embodiment, the first conductive rod 322 is a round T2 copper rod with a diameter of 7 mm.
In this embodiment, the second conductive rod 332 is a round carbon-graphite rod with a diameter of 7 mm.
In the application, the photovoltaic inverter 4 is an inverter with the model of GW10K-MS-C30, which accords with the standards of related technologies such as grid connection with a national power grid and the like, so as to completely simulate the real working condition environment and meet various tests under different capacities.
Referring to fig. 4, each part of the photovoltaic direct current fault arc testing system disclosed by the embodiment of the application is respectively arranged in a control cabinet which can be moved conveniently, wherein a control end 1 is arranged in a photovoltaic-direct current-arc testing system cabinet, a direct current power supply generator 2 and a photovoltaic inverter 4 are arranged in a standard power supply system-photovoltaic inverter cabinet, and a fault arc generator 3 is arranged in a fault arc generating cabinet.
Referring to fig. 5, the embodiment of the application also discloses a photovoltaic direct current fault arc testing method, which is applied to the photovoltaic direct current fault arc testing system and comprises the following steps:
s1, providing a direct current power generator 2 to generate standard direct current and direct voltage, and then connecting the standard direct current power generator and the direct voltage to a product 5 to be tested;
s2, providing a fault arc generator 3 to generate a fault arc signal in the circuit;
s3, providing a photovoltaic inverter 4 to integrate the direct current voltage and direct current after passing through the fault arc generator 3 into a power grid;
and S4, providing a control end 1, controlling the fault arc generator 3 to generate a fault arc signal based on a preset test mode, and judging whether the product 5 to be tested is qualified or not by receiving a feedback signal of the product 5 to be tested.
The above description of the preferred embodiments of the present application should not be taken as limiting the scope of the application, but rather should be understood to cover all modifications, variations and adaptations of the present application using its general principles and the following detailed description and the accompanying drawings, or the direct/indirect application of the present application to other relevant arts and technologies.
Claims (10)
1. The photovoltaic direct current fault arc test system is characterized by comprising a control end, and a direct current power supply generator, a fault arc generator and a photovoltaic inverter which are respectively in communication connection with the control end; the fault arc generator is respectively and electrically connected with the photovoltaic inverter and a product to be tested; the direct-current power supply generator is respectively and electrically connected with the photovoltaic inverter and a product to be tested; the photovoltaic inverter is used for accessing a power grid; the control end controls the fault arc generator to generate a fault arc signal based on a preset test mode, and judges whether the product to be tested is qualified or not by receiving a feedback signal of the product to be tested.
2. The photovoltaic dc fault arc testing system of claim 1, wherein the fault arc generator comprises a base, and a stationary pole and a moving pole disposed opposite the base, the moving pole being movable toward and away from the stationary pole by a moving assembly to control the generated fault arc signal.
3. The photovoltaic direct current fault arc testing system of claim 2, wherein the fault arc generator further comprises a variable speed assembly disposed on a base, the variable speed assembly being coupled to the moving assembly to adjust the speed of the moving assembly.
4. The photovoltaic dc fault arc testing system of claim 2, wherein the stationary pole comprises a first mount and a first conductive rod disposed on the first mount, the first conductive rod forming a planar arc generating end proximate an end face of the movable pole.
5. The photovoltaic dc fault arc testing system of claim 2 wherein the movable pole comprises a second mount and a second conductive rod disposed on the second mount, the second conductive rod forming a spherical arc generating end near an end face of the stationary pole.
6. The photovoltaic direct current fault arc testing system of claim 2 wherein the moving component is a servo motor.
7. The photovoltaic direct current fault arc testing system of claim 3 wherein the speed change component is a transmission.
8. The photovoltaic direct current fault arc testing system of claim 4 wherein the first conductive rod is a T2 copper rod.
9. The photovoltaic direct current fault arc testing system of claim 5 wherein the second conductive rod is a carbon-graphite rod.
10. A method of testing a photovoltaic direct current fault arc using the photovoltaic direct current fault arc testing system of any of claims 1 to 9, comprising the steps of:
s1, providing a direct current power generator to generate standard direct current and direct voltage, and then connecting the standard direct current power generator to a product to be tested;
s2, providing a fault arc generator to generate a fault arc signal in the circuit;
s3, providing a photovoltaic inverter to integrate the direct current voltage and direct current passing through the fault arc generator into a power grid;
and S4, providing a control end, controlling the fault arc generator to generate a fault arc signal based on a preset test mode, and judging whether the product to be tested is qualified or not by receiving a feedback signal of the product to be tested.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311123719.XA CN117148064A (en) | 2023-09-01 | 2023-09-01 | Photovoltaic direct current fault arc testing system and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311123719.XA CN117148064A (en) | 2023-09-01 | 2023-09-01 | Photovoltaic direct current fault arc testing system and method |
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| CN117148064A true CN117148064A (en) | 2023-12-01 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118068164A (en) * | 2024-04-17 | 2024-05-24 | 浙江省机电产品质量检测所有限公司 | Photovoltaic direct current arc fault protection electrical apparatus check out test set |
| CN118244069A (en) * | 2024-05-20 | 2024-06-25 | 应急管理部沈阳消防研究所 | DC arc typical parameter measurement research platform and method |
-
2023
- 2023-09-01 CN CN202311123719.XA patent/CN117148064A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118068164A (en) * | 2024-04-17 | 2024-05-24 | 浙江省机电产品质量检测所有限公司 | Photovoltaic direct current arc fault protection electrical apparatus check out test set |
| CN118244069A (en) * | 2024-05-20 | 2024-06-25 | 应急管理部沈阳消防研究所 | DC arc typical parameter measurement research platform and method |
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