CN217956708U - Photovoltaic grid-connected access system - Google Patents
Photovoltaic grid-connected access system Download PDFInfo
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- CN217956708U CN217956708U CN202222301732.7U CN202222301732U CN217956708U CN 217956708 U CN217956708 U CN 217956708U CN 202222301732 U CN202222301732 U CN 202222301732U CN 217956708 U CN217956708 U CN 217956708U
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model discloses a photovoltaic grid-connected access system, which comprises a photovoltaic grid-connected cabinet, a low-voltage power distribution cabinet and a high-voltage power distribution cabinet, wherein the input end of the inlet cabinet of the high-voltage power distribution cabinet is connected with commercial power, the output end of a distribution transformer cabinet of the high-voltage power distribution cabinet is electrically connected with the input end of the commercial power inlet cabinet of the low-voltage power distribution cabinet, and a power load cabinet of the low-voltage power distribution cabinet is provided with a grid-connected point; the photovoltaic grid-connected cabinet is provided with an isolating switch chamber, a metering chamber, a main switch chamber and an outlet switch chamber. The isolating switch is installed in the isolating switch chamber, the metering chamber is provided with a power generation meter, and the main switch chamber is provided with a plastic shell breaker and a surge protector. When a line fault occurs, the photovoltaic grid-connected cabinet is quickly disconnected, the voltage-loss tripping function is achieved, the electric quantity metering precision is improved, and the device maintenance amount is reduced.
Description
Technical Field
The utility model relates to a photovoltaic grid-connected technology field especially relates to a photovoltaic grid-connected access system.
Background
Solar photovoltaic power generation is an important form of solar energy utilization, and is a power generation form of converting light energy into electric energy by adopting a photovoltaic module. At present, a photovoltaic grid-connected system needs to connect photovoltaic modules in series and parallel to form a photovoltaic array, then the output of the photovoltaic array is collected and connected to an inverter, and the inverter converts direct current output by the photovoltaic array into alternating current to be directly transmitted to a public power grid. Therefore, a photovoltaic grid-connected access system for transmitting alternating current to a public power grid is also an important part of photovoltaic grid connection. The existing photovoltaic grid-connected access system cannot quickly disconnect a photovoltaic grid-connected cabinet when a line fault exists, so that electric quantity metering is influenced, and devices are easily damaged.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a photovoltaic grid-connected access system, quick disconnection photovoltaic grid-connected cabinet when the circuit trouble has decompression tripping operation function, improves the electric quantity measurement precision, reduces the device maintenance volume.
To achieve the purpose, the utility model adopts the following technical proposal:
a photovoltaic grid-connected access system comprises a photovoltaic grid-connected cabinet, a low-voltage power distribution cabinet and a high-voltage power distribution cabinet, wherein the input end of an incoming cabinet of the high-voltage power distribution cabinet is connected with commercial power, the output end of a distribution transformer cabinet of the high-voltage power distribution cabinet is electrically connected with the input end of the commercial power incoming cabinet of the low-voltage power distribution cabinet, and a power load cabinet of the low-voltage power distribution cabinet is provided with a grid-connected point;
the photovoltaic grid-connected cabinet is provided with an isolating switch chamber, a metering chamber, a main switch chamber and a wire outlet switch chamber, wherein the isolating switch chamber is provided with an isolating switch, the metering chamber is provided with a power generation meter, the main switch chamber is provided with a first molded case circuit breaker and a surge protector, the wire outlet switch chamber is provided with a second molded case circuit breaker and a third molded case circuit breaker, and the top of the photovoltaic grid-connected cabinet is provided with a power cabinet standard hole communicated with the isolating switch chamber;
the grid-connected point of the power load cabinet is electrically connected with the fixed contact of the isolating switch, the moving contact of the isolating switch is electrically connected with the input end of the metering chamber, the fixed contact of the first molded case circuit breaker and the fixed contact of the surge protector are both electrically connected with the output end of the metering chamber, the moving contact of the surge protector is grounded, and the fixed contact of the second molded case circuit breaker and the fixed contact of the third molded case circuit breaker are both electrically connected with the moving contact of the first molded case circuit breaker;
the movable contact of the second molded case circuit breaker is electrically connected with the alternating current end of the first inverter, and the movable contact of the third molded case circuit breaker is electrically connected with the alternating current end of the second inverter;
the metering chamber is provided with an ammeter power line point, the main switch chamber is provided with a no-voltage tripping power line point, and the metering cabinet of the high-voltage power distribution cabinet is provided with a gateway bidirectional metering electric energy meter.
Preferably, the measuring room includes electric energy meter room and current transformer room, the electric energy meter room is installed a plurality ofly the electricity generation strapping table, a plurality of current transformer are installed to the current transformer room.
Preferably, the electric energy meter chamber and the current transformer chamber are both provided with transparent observation windows.
Preferably, the electricity generation gauge is one-way three-phase intelligent electric energy meter, the gateway two-way metering electric energy meter is two-way three-phase intelligent electric energy meter, and the first inverter and the second inverter are both string inverters.
Preferably, the inverter further comprises a first MPPT controller and a first photovoltaic panel group, wherein a direct current end of the first inverter is connected in parallel with the plurality of first MPPT controllers, and the first MPPT controller is connected in parallel with the plurality of first photovoltaic panel groups;
the direct current end of the second inverter is connected with the second MPPT controllers in parallel, and the second MPPT controllers are connected with the second photovoltaic panel groups in parallel.
Preferably, the first photovoltaic panel group and the second photovoltaic panel group both comprise a plurality of photovoltaic panels and photovoltaic panel installation components, the photovoltaic panels are installed on the photovoltaic panel installation components, and two adjacent photovoltaic panel installation components are connected through connectors.
Preferably, in the first photovoltaic panel group and the second photovoltaic panel group, the photovoltaic panels are connected in series through a photovoltaic cable.
Preferably, the photovoltaic grid-connected cabinet body is made of galvanized steel plates, and the thickness of each galvanized steel plate is not less than 2mm.
Preferably, the bottom plate of the electric energy meter chamber and the bottom plate of the current transformer chamber are both provided with insulating base plates.
The utility model discloses following beneficial effect has:
the isolation switch is arranged on the photovoltaic grid-connected cabinet and used as an obvious disconnection point of the photovoltaic grid connection, and the isolation switch is used for switching on and switching off a circuit, used for an isolation power supply in a set of equipment and used for infrequent switching on and switching off power supply. When the commercial power is cut off or the main switch of the low-voltage power distribution cabinet is disconnected, the isolating switch is automatically disconnected, and when the commercial power is normal or the main switch of the low-voltage power distribution cabinet is switched on, the isolating switch can be normally switched on.
The metering chamber is provided with a power generation meter to intensively meter the sum of the power generation amount of the first inverter and the second inverter to be used as the statistics of the power generation amount of the photovoltaic system; meanwhile, a metering cabinet of the high-voltage power distribution cabinet is provided with a gateway bidirectional metering electric energy meter for metering the upper and lower electric quantities of a user and an electric power distribution point, and the metering electric energy meter is used as a basis for settlement of the surplus network electric quantity. Therefore, through the arrangement of the meters at the two positions and the isolation switch as an obvious disconnection point of the photovoltaic grid connection, the electric quantity can be effectively and accurately measured.
Drawings
Fig. 1 is an external structure schematic diagram of a photovoltaic grid-connected cabinet according to one embodiment of the present invention.
Fig. 2 is a schematic diagram of the internal structure of the photovoltaic grid-connected cabinet according to one embodiment of the present invention.
Fig. 3 is a wiring schematic diagram of a photovoltaic grid-connected cabinet according to one embodiment of the present invention.
Fig. 4 is a wiring schematic diagram of a photovoltaic grid-connected access system according to one embodiment of the present invention.
Fig. 5 is a block diagram of a first inverter and a first MPPT controller according to one embodiment of the present invention.
Fig. 6 is a block diagram of a second inverter and a second MPPT controller according to one embodiment of the present invention.
Fig. 7 is a wiring structure diagram of a photovoltaic panel according to one embodiment of the present invention.
Wherein: a photovoltaic grid-connected cabinet 1; a low-voltage power distribution cabinet 2; a high voltage distribution cabinet 3; a wire inlet cabinet 31; a distribution and transformation cabinet 32; a mains supply inlet cabinet 21; a power load cabinet 22; an isolation switch chamber 11; a metering chamber 12; a main switching room 13; an outlet switch chamber 14; an isolator switch 15; a power generation meter 16; a first molded case circuit breaker 17; a second molded case circuit breaker 18; a third molded case circuit breaker 19; a surge protector 10; a standard hole 103 of the power cabinet; a first inverter 4; a second inverter 5; taking a point 101 by a power line of an electric meter; taking a point 102 of a voltage-loss tripping power line; a metering cabinet 33; an electric energy meter chamber 121; a current transformer room 122; a current transformer 123; a viewing window 104; a first MPPT controller 6; a first photovoltaic panel group 7; a second MPPT controller 8; a second group of photovoltaic panels 9; a photovoltaic panel 71.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial.
In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "disposed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The technical scheme provides a photovoltaic grid-connected access system, as shown in fig. 4, which comprises a photovoltaic grid-connected cabinet 1, a low-voltage power distribution cabinet 2 and a high-voltage power distribution cabinet 3, wherein the input end of a wire inlet cabinet 31 of the high-voltage power distribution cabinet 3 is connected with a mains supply, the output end of a distribution transformer cabinet 32 of the high-voltage power distribution cabinet 3 is electrically connected with the input end of a mains supply wire inlet cabinet 21 of the low-voltage power distribution cabinet 2, and a power load cabinet 22 of the low-voltage power distribution cabinet 2 is provided with a grid-connected point;
as shown in fig. 1 to 3, the photovoltaic grid-connected cabinet 1 is provided with an isolating switch chamber 11, a metering chamber 12, a main switch chamber 13 and a wire outlet switch chamber 14, the isolating switch chamber 11 is provided with an isolating switch 15, the metering chamber 12 is provided with a power generation meter 16, the main switch chamber 13 is provided with a first molded case circuit breaker 17 and a surge protector 10, the wire outlet switch chamber 14 is provided with a second molded case circuit breaker 18 and a third molded case circuit breaker 19, and the top of the photovoltaic grid-connected cabinet 1 is provided with a power cabinet standard hole 103 communicated with the isolating switch chamber 11;
the grid-connected point of the power load cabinet 22 is electrically connected with the fixed contact of the isolating switch 15, the moving contact of the isolating switch 15 is electrically connected with the input end of the metering chamber 12, the fixed contact of the first molded case circuit breaker 17 and the fixed contact of the surge protector 10 are both electrically connected with the output end of the metering chamber 12, the moving contact of the surge protector 10 is grounded, and the fixed contact of the second molded case circuit breaker 18 and the fixed contact of the third molded case circuit breaker 19 are both electrically connected with the moving contact of the first molded case circuit breaker 17;
the system also comprises a first inverter 4 and a second inverter 5, wherein the movable contact of the second molded case circuit breaker 18 is electrically connected with the alternating current end of the first inverter 4, and the movable contact of the third molded case circuit breaker 19 is electrically connected with the alternating current end of the second inverter 5;
the metering chamber 12 is provided with an electric meter power line point 101, the main switch chamber 13 is provided with a voltage loss tripping power line point 102, and the metering cabinet 33 of the high-voltage power distribution cabinet 3 is provided with a gateway bidirectional metering electric energy meter.
In the photovoltaic grid-connected access system, an isolating switch 15 is arranged on a photovoltaic grid-connected cabinet 1 as an obvious disconnection point of the photovoltaic grid connection, the isolating switch 15 is used for switching on and switching off a circuit, is used for an isolated power supply in complete equipment and is used for infrequent switching on and switching off power supply, the type selection requirement of the isolating switch 15 is that the rated voltage is not lower than the system voltage, the rated current is not lower than the load current, a 4P circuit breaker can be selected, and the rated current is larger than the maximum line working current. When the commercial power is cut off or the main switch of the low-voltage power distribution cabinet 2 is disconnected, the isolating switch 15 is automatically disconnected, and when the commercial power is normal or the main switch of the low-voltage power distribution cabinet 2 is switched on, the isolating switch 15 can be normally switched on.
The metering chamber 12 is provided with a power generation meter 16 to intensively meter the sum of the power generation amount of the first inverter 4 and the second inverter 5 as the power generation amount statistics of the photovoltaic system; meanwhile, the metering cabinet 33 of the high-voltage power distribution cabinet 3 is provided with a gateway bidirectional metering electric energy meter for metering the upper and lower electric quantities of the user and the electric power distribution point, and the metering electric energy meter is used as a settlement basis for the surplus network electric power. Therefore, through the arrangement of the meters at the two positions and the isolation switch 15 as an obvious disconnection point of the photovoltaic grid connection, the electric quantity can be effectively and accurately measured.
The photovoltaic grid-connected cabinet 1 is also provided with a metering chamber 12, a main switch chamber 13 and an outgoing switch chamber 14 among the first inverter 4 and the second inverter 5 so as to comprehensively protect the line safety and reduce the influence of faults on metering, the first molded case circuit breaker 17 is used as a main protection switch and can simultaneously disconnect two branches of the first inverter 4 and the second inverter 5, and the first molded case circuit breaker 17 has the functions of voltage loss tripping and reclosing; when a peak current or voltage is suddenly generated in an electric loop or a communication line due to external interference, the surge protector 10 can conduct shunt in a very short time, so that damage of the surge to other equipment in the loop is avoided. The second molded case circuit breaker 18 and the third molded case circuit breaker 19 are arranged to protect the first inverter 4 and the second inverter 5 respectively, the second molded case circuit breaker 18 and the third molded case circuit breaker 19 have the functions of short-circuit instantaneous long-delay protection, shunt tripping, under-voltage tripping, no-voltage tripping and the like, and the circuit can act quickly when various types of short-circuit faults occur, and can jump off the circuit breakers instantaneously, so that the faults can be removed quickly and reliably when the whole line faults occur.
Specifically, as shown in fig. 1 and 2, the metering chamber 12 includes an electric energy meter chamber 121 and a current transformer chamber 122, the electric energy meter chamber 121 is mounted with a plurality of the power generation meters 16, and the current transformer chamber 122 is mounted with a plurality of current transformers 123. A plurality of power generation meters 16 can be arranged to respectively count the photovoltaic power generation amount transmitted by the first inverter 4 and the second inverter 5 and the sum of the photovoltaic power generation amount of the first inverter and the photovoltaic power generation amount of the second inverter; the plurality of current transformers 123 respectively measure real-time currents of the branches, detect the operating conditions of the branches, and provide data support for fault detection.
Further, as shown in fig. 1, the electric energy meter chamber 121 and the current transformer chamber 122 are provided with transparent observation windows 104. Through setting up transparent observation window 104, the staff can observe the detection data of each strapping table in electric energy meter room 121 and the current transformer room 122 is convenient for patrol and examine and the development of maintenance work.
It should be noted that the power generation meter 16 is a unidirectional three-phase intelligent electric energy meter, the gateway bidirectional metering electric energy meter is a bidirectional three-phase intelligent electric energy meter, and the first inverter 4 and the second inverter 5 are both string inverters. The power generation meter 16 is a unidirectional three-phase intelligent electric energy meter, the precision requirement is 0.2 grade, and the CT precision requirement is 0.2 grade; the gateway bidirectional metering electric energy meter is a bidirectional three-phase intelligent electric energy meter, the precision requirement is 0.2 grade, and the CT precision requirement is 0.2s grade. The first inverter 4 and the second inverter 5 are both string-type inverters, the string-type inverters are high in protection level, the protection level is mostly IP65, and the string-type inverters can be directly installed outdoors; the direct current input is a special MC4 waterproof terminal for photovoltaic, and can be directly connected with a battery panel without passing through a direct current combiner box; the output voltage range is wide, the output alternating-current phase voltage is mostly 180-280V, and the local single-phase or three-phase power grid can be directly accessed.
In some embodiments, as shown in fig. 5, further comprising a first MPPT controller 6 and a first photovoltaic panel group 7, wherein the dc terminal of the first inverter 4 is connected in parallel with a plurality of the first MPPT controllers 6, and the first MPPT controller 6 is connected in parallel with a plurality of the first photovoltaic panel groups 7;
as shown in fig. 6, the MPPT system further includes a second MPPT controller 8 and a second photovoltaic panel group 9, wherein a dc terminal of the second inverter 5 is connected in parallel to the plurality of second MPPT controllers 8, and the second MPPT controller 8 is connected in parallel to the plurality of second photovoltaic panel groups 9. In the present embodiment, the first inverter 4 is connected in parallel with 10 first MPPT controllers 6, and each first MPPT controller 6 is connected in parallel with two first MPPT groups 7, so as to generate an electric quantity of 100KW or more in total. The second inverter 5 is connected with 4 second MPPT controllers 8 in parallel, and each second MPPT controller 8 is connected with two second photovoltaic panel groups 9 in parallel, so that the total electric quantity can be more than 40 KW.
More specifically, as shown in fig. 7, each of the first photovoltaic panel group 7 and the second photovoltaic panel group 9 includes a plurality of photovoltaic panels 71 and photovoltaic panel mounting assemblies, the photovoltaic panels 71 are mounted on the photovoltaic panel mounting assemblies, and two adjacent photovoltaic panel mounting assemblies are connected by connectors. Therefore, the array photovoltaic panel groups are formed, the adjacent two photovoltaic panel installation assemblies are connected through connectors, the assembly and disassembly are convenient, and the photovoltaic panels 71 can be flexibly disassembled or additionally installed.
Alternatively, in the first photovoltaic panel group 7 and the second photovoltaic panel group 9, the photovoltaic panels 71 are connected in series by photovoltaic cables.
Preferably, the photovoltaic grid-connected cabinet 1 is made of galvanized steel plates, and the thickness of each galvanized steel plate is not less than 2mm, so that the photovoltaic grid-connected cabinet is firm, durable, waterproof and corrosion-resistant.
Furthermore, the bottom plate of the electric energy meter chamber 121 and the bottom plate of the current transformer chamber 122 are both provided with insulating backing plates, so that an insulating protection effect is achieved, and the influence on the metering result is avoided.
The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.
Claims (9)
1. The utility model provides a photovoltaic is incorporated into power networks and is inserted system, includes photovoltaic and is incorporated into power networks cabinet, low-voltage distribution cabinet and high-voltage distribution cabinet, its characterized in that: the input end of the incoming line cabinet of the high-voltage power distribution cabinet is connected with commercial power, the output end of the distribution transformer cabinet of the high-voltage power distribution cabinet is electrically connected with the input end of the commercial power incoming line cabinet of the low-voltage power distribution cabinet, and the power load cabinet of the low-voltage power distribution cabinet is provided with a grid-connected point;
the photovoltaic grid-connected cabinet is provided with an isolating switch chamber, a metering chamber, a main switch chamber and a wire outlet switch chamber, wherein the isolating switch chamber is provided with an isolating switch, the metering chamber is provided with a power generation meter, the main switch chamber is provided with a first molded case circuit breaker and a surge protector, the wire outlet switch chamber is provided with a second molded case circuit breaker and a third molded case circuit breaker, and the top of the photovoltaic grid-connected cabinet is provided with a power cabinet standard hole communicated with the isolating switch chamber;
the grid-connected point of the power load cabinet is electrically connected with the fixed contact of the isolating switch, the moving contact of the isolating switch is electrically connected with the input end of the metering chamber, the fixed contact of the first molded case circuit breaker and the fixed contact of the surge protector are both electrically connected with the output end of the metering chamber, the moving contact of the surge protector is grounded, and the fixed contact of the second molded case circuit breaker and the fixed contact of the third molded case circuit breaker are both electrically connected with the moving contact of the first molded case circuit breaker;
the movable contact of the second molded case circuit breaker is electrically connected with the alternating current end of the first inverter, and the movable contact of the third molded case circuit breaker is electrically connected with the alternating current end of the second inverter;
the metering chamber is provided with an ammeter power line point, the main switch chamber is provided with a no-voltage tripping power line point, and the metering cabinet of the high-voltage power distribution cabinet is provided with a gateway bidirectional metering electric energy meter.
2. The grid-connected photovoltaic access system according to claim 1, characterized in that: the measurement room includes electric energy meter room and current transformer room, the electric energy meter room is installed a plurality ofly the electricity generation strapping table, a plurality of current transformer are installed to the current transformer room.
3. The grid-connected photovoltaic access system according to claim 2, characterized in that: and the electric energy meter chamber and the current transformer chamber are both provided with transparent observation windows.
4. The grid-connected photovoltaic access system according to claim 1, characterized in that: the power generation meter is a one-way three-phase intelligent electric energy meter, the gateway two-way metering electric energy meter is a two-way three-phase intelligent electric energy meter, and the first inverter and the second inverter are both string inverters.
5. The grid-connected photovoltaic access system according to claim 1, characterized in that: the direct-current end of the first inverter is connected with the plurality of first MPPT controllers in parallel, and the first MPPT controllers are connected with the plurality of first photovoltaic panel groups in parallel;
the photovoltaic grid-connected inverter is characterized by further comprising a second MPPT controller and a second photovoltaic panel set, wherein the direct-current end of the second inverter is connected with the plurality of second MPPT controllers in parallel, and the second MPPT controllers are connected with the plurality of second photovoltaic panel sets in parallel.
6. The grid-connected photovoltaic access system according to claim 5, wherein: the first photovoltaic panel group and the second photovoltaic panel group both comprise a plurality of photovoltaic panels and photovoltaic panel installation components, the photovoltaic panels are installed on the photovoltaic panel installation components, and the photovoltaic panel installation components are connected through connectors.
7. The grid-connected photovoltaic access system according to claim 6, wherein: in the first photovoltaic panel group and the second photovoltaic panel group, the photovoltaic panels are connected in series through photovoltaic cables.
8. The grid-connected photovoltaic access system according to claim 1, characterized in that: the photovoltaic grid-connected cabinet body is made of galvanized steel plates, and the thickness of each galvanized steel plate is not less than 2mm.
9. The grid-connected photovoltaic access system according to claim 2, characterized in that: and the bottom plate of the electric energy meter chamber and the bottom plate of the current transformer chamber are both provided with insulating base plates.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222301732.7U CN217956708U (en) | 2022-08-31 | 2022-08-31 | Photovoltaic grid-connected access system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222301732.7U CN217956708U (en) | 2022-08-31 | 2022-08-31 | Photovoltaic grid-connected access system |
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| CN217956708U true CN217956708U (en) | 2022-12-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220149600A1 (en) * | 2020-11-09 | 2022-05-12 | City of Dubuque | Multi-function cabinet |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220149600A1 (en) * | 2020-11-09 | 2022-05-12 | City of Dubuque | Multi-function cabinet |
| US11641093B2 (en) * | 2020-11-09 | 2023-05-02 | City of Dubuque | Multi-function cabinet |
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