Photovoltaic confluence cabinet and photovoltaic system

Abstract

The utility model is suitable for the field of photovoltaic technology, and especially relates to a photovoltaic confluence cabinet and a photovoltaic system. The photovoltaic confluence cabinet comprises a cabinet body and a plurality of branch loops, the cabinet body accommodates the branch loops, and the branch loops are arranged on at least one side of the cabinet body; each branch loop comprises an isolating switch, a fuse, a busbar and a frame circuit breaker; wherein the lower port of the isolating switch is connected with an external cable through a first wiring busbar, the upper port of the isolating switch is connected with the lower port of the fuse through a first branch bar, the upper port of the fuse is connected with the busbar through a second branch bar, the lower port of the frame circuit breaker is connected with the busbar, and the upper port of the frame circuit breaker is connected with the busbar. And the upper port of the frame circuit breaker is connected with external equipment through a second wiring busbar. According to the utility model, through the arrangement of the busbar, the layout of the branch loop is more compact, and the size and volume of the photovoltaic confluence cabinet are reduced.

Description

Technical Field

[0001] This utility model belongs to the field of photovoltaics, and in particular relates to a photovoltaic combiner cabinet and a photovoltaic system. Background Technology

[0002] Photovoltaic combiner cabinets are one of the core devices in photovoltaic power generation systems. They are mainly used for combining, regulating, and protecting the AC output from photovoltaic inverters, and play a crucial role in stabilizing voltage within the photovoltaic inverter system. Their functions include voltage stabilization and regulation, overvoltage and undervoltage protection, short-circuit protection, and monitoring and displaying electrical parameters to ensure the safe operation of the photovoltaic power generation system and the quality of its power output.

[0003] In related technologies, the excessive size of the branch circuits in photovoltaic combiner cabinets leads to an oversized cabinet that cannot be integrated into standard shipping containers for transport by sea. However, forcibly reducing the size of the branch circuits would create interphase safety hazards and system overheating risks. Utility Model Content

[0004] This utility model provides a photovoltaic combiner cabinet and a photovoltaic system, aiming to solve the technical problem of excessive size in existing photovoltaic combiner cabinets.

[0005] This utility model embodiment is implemented as follows: the photovoltaic combiner cabinet provided by this utility model includes a cabinet body and several branch circuits. The cabinet body houses the branch circuits, and the branch circuits are arranged on at least one side of the cabinet body. The branch circuits include: a disconnecting switch, a fuse, a busbar, and a frame circuit breaker. The lower port of the disconnecting switch is connected to an external cable through a first busbar, the upper port of the disconnecting switch is connected to the lower port of the fuse through a first branch bar, the upper port of the fuse is connected to the busbar through a second branch bar, the lower port of the frame circuit breaker is connected to the busbar, and the upper port of the frame circuit breaker is connected to an external device through a second busbar.

[0006] Furthermore, the photovoltaic combiner cabinet also includes a secondary control device, which is housed within the cabinet.

[0007] Furthermore, the photovoltaic combiner cabinet also includes an auxiliary transformer, which is housed within the cabinet and supplies power to the secondary control devices.

[0008] Furthermore, the photovoltaic combiner cabinet also includes several power interfaces, and the cabinet body houses the power interfaces.

[0009] Furthermore, it also includes a heat dissipation component, which is installed in the cabinet to dissipate heat from the photovoltaic combiner cabinet.

[0010] Furthermore, the heat dissipation assembly includes an air inlet louver, an exhaust fan, and an air outlet; the air inlet louver is located on at least one side of the cabinet, and the cabinet houses the exhaust fan and the air outlet.

[0011] Furthermore, there are multiple fuses, and an insulating baffle is provided between two adjacent fuses.

[0012] Furthermore, the insulating baffle has openings.

[0013] This utility model embodiment also provides a photovoltaic system, which includes the photovoltaic combiner cabinet as described above.

[0014] This utility model provides a photovoltaic combiner cabinet and a photovoltaic system. The photovoltaic combiner cabinet includes a cabinet body and several branch circuits. The cabinet body houses the branch circuits, which are located on at least one side of the cabinet body. Each branch circuit includes: a disconnecting switch, a fuse, a busbar, and a frame circuit breaker. The lower port of the disconnecting switch is connected to an external cable via a first busbar, the upper port of the disconnecting switch is connected to the lower port of the fuse via a first branch bar, the upper port of the fuse is connected to the busbar via a second branch bar, the lower port of the frame circuit breaker is connected to the busbar, and the upper port of the frame circuit breaker is connected to external equipment via a second busbar. In this utility model, by using the first busbar, first branch bar, second branch bar, busbar, and second busbar, the disconnecting switch, fuse, busbar, and frame circuit breaker constituting the branch circuit can be sequentially connected and arranged within the cabinet body, making the branch circuit layout more compact and reducing the size and volume of the photovoltaic combiner cabinet. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the module structure of a photovoltaic system provided in one embodiment of the present invention;

[0016] Figure 2 This is a front structural diagram of a photovoltaic combiner cabinet provided in one embodiment of the present invention;

[0017] Figure 3 This is a side view of a photovoltaic combiner cabinet provided in one embodiment of the present invention;

[0018] Figure 4 This is a schematic diagram of another side view of the photovoltaic combiner cabinet provided in one embodiment of the present invention;

[0019] Figure 5 This is a schematic diagram of the arrangement structure of an air inlet louver in a photovoltaic combiner cabinet according to an embodiment of the present invention;

[0020] Figure 6 This is a schematic diagram of another arrangement structure of the air inlet louvers in a photovoltaic combiner cabinet provided in one embodiment of the present invention;

[0021] Figure 7 This is a schematic diagram of the exhaust fan and air outlet structure in a photovoltaic combiner cabinet according to one embodiment of the present invention;

[0022] Figure 8 This is a schematic diagram of the arrangement of insulating baffles in a photovoltaic combiner cabinet according to one embodiment of the present invention;

[0023] Figure 9 This is a schematic diagram of the insulating baffle structure in a photovoltaic combiner cabinet according to one embodiment of the present invention;

[0024] Figure 10 This is a schematic diagram of the busbar arrangement structure in a photovoltaic combiner cabinet according to one embodiment of the present invention.

[0025] Key component symbols: 1000, Photovoltaic system; 100, Photovoltaic combiner cabinet; 10, Cabinet; 20, Disconnect switch; 30, Fuse; 40, Busbar; 50, Frame circuit breaker; 80, Heat dissipation assembly; 11, Secondary control room; 12, Auxiliary transformer room; 13, Power interface room; 61, First busbar; 62, First branch busbar; 63, Second branch busbar; 64, Second busbar; 65, Insulating baffle; 651, Opening; 71, Secondary control device; 72, Power interface; 73, Auxiliary transformer; 81, Air inlet louver; 82, Exhaust fan; 83, Air outlet. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0027] Please see Figure 1 The photovoltaic system 1000 in this embodiment of the present invention may include the photovoltaic combiner cabinet 100 in this embodiment of the present invention.

[0028] Please refer to the following: Figures 2 to 10 The photovoltaic combiner cabinet 100 of this embodiment includes a cabinet body 10 and a plurality of branch circuits. The cabinet body 10 houses the branch circuits, which are disposed on at least one side of the cabinet body 10. The branch circuits may be disposed on the front and / or the side of the cabinet body 10. The branch circuits include: a disconnect switch 20, a fuse 30, a busbar 40, and a frame circuit breaker 50.

[0029] The lower port of the disconnector switch 20 is connected to an external cable via the first busbar 61, the upper port of the disconnector switch 20 is connected to the lower port of the fuse 30 via the first branch 62, the upper port of the fuse 30 is connected to the busbar 40 via the second branch 63, the lower port of the frame circuit breaker 50 is connected to the busbar 40, and the upper port of the frame circuit breaker 50 is connected to external equipment via the second busbar 64.

[0030] Therefore, in this utility model, by setting up the first busbar 61, the first branch busbar 62, the second branch busbar 63, the busbar 40, and the second busbar 64, the isolating switch 20, fuse 30, busbar 40, and frame circuit breaker 50 constituting the branch circuit can be sequentially connected and arranged in the cabinet 10, making the layout of the branch circuit more compact and reducing the size and volume of the photovoltaic combiner cabinet 100. Thus, through the arrangement of the branch circuits in this utility model, multiple branch circuits can be efficiently arranged in a limited space, thereby improving the overall rationality of the photovoltaic combiner cabinet 100 layout and achieving the effect of reducing the size and volume of the photovoltaic combiner cabinet 100. At the same time, this utility model can integrate all branch circuits into the cabinet 10. Through the compact modular design and the flexibility of the side and front arrangement, it achieves a compact system structure, is easy to maintain, and provides necessary protection for electrical components through the cabinet 10, realizing the advantage of centralized storage.

[0031] Specifically, the photovoltaic combiner cabinet 100 can be a low-voltage photovoltaic combiner cabinet 100, that is, the AC or DC voltage of the photovoltaic combiner cabinet 100 is less than 1000 volts.

[0032] The cabinet 10 constitutes the main body of the photovoltaic combiner cabinet 100. The cabinet 10 of the photovoltaic combiner cabinet 100 is designed to accommodate multiple branch circuits. The branch circuits are centrally housed inside the cabinet 10, which avoids the mess of external wiring, simplifies the cable layout, and improves the overall aesthetics and safety of the photovoltaic combiner cabinet 100.

[0033] Furthermore, the number of branch circuits can be set to multiple, and the arrangement height of each branch circuit can be arranged to be the same. This facilitates modular installation and the uniform arrangement of each branch circuit within the cabinet 10. This modular design not only simplifies the installation process but also facilitates the subsequent expansion and maintenance of branch circuits.

[0034] For specific components of the branch circuit in the photovoltaic combiner cabinet 100, the disconnect switch 20 can preferably be located at the lower part of the cabinet 10. The lower port of the disconnect switch 20 is connected to the external cable through the first busbar 61, which serves to isolate the circuit and ensure maintenance safety and electrical independence. The upper port of the disconnect switch 20 is connected to the lower port of the fuse 30 through the first branch bar 62, which facilitates the flow of current to the next component.

[0035] Fuse 30 is connected between disconnector 20 and busbar 40 to protect the circuit from abnormal current. The lower port of fuse 30 is connected to the upper port of disconnector 20, and the upper port of disconnector 20 is connected to busbar 40 through the second branch 63. Fuse 30 automatically cuts off the current when there is an overcurrent in the branch circuit, ensuring the safety of the branch circuit.

[0036] Busbar 40 connects fuse 30 and frame circuit breaker 50, realizing the collection of current from each branch circuit, facilitating centralized management of current flow, and improving current stability and safety. The upper port of fuse 30 is connected to the input port of busbar 40, allowing current to be collected through fuse 30 to busbar 40.

[0037] The output port of busbar 40 is connected to the lower port of the frame circuit breaker 50, which is responsible for controlling the safety of current output to external devices. The upper port of the frame circuit breaker 50 is connected to external devices through the second busbar 64, providing overload protection.

[0038] At the same time, such as Figure 10 As shown, in this application, key components (such as disconnector 20, fuse 30, busbar 40, and frame circuit breaker 50) are directly connected via busbars (first wiring busbar 61, first branch busbar 62, second branch busbar 63, busbar 40, and second wiring busbar 64), replacing redundant cables in traditional wiring, greatly reducing the required cable length and wiring complexity. This makes the wiring of branch circuits simpler, thereby saving the volume occupied by branch circuits and the space of the photovoltaic combiner cabinet 100.

[0039] Furthermore, in this invention, the isolating switch 20 and fuse 30 in the branch circuit are installed from bottom to top. That is, the isolating switch 20 and fuse 30 are respectively located at the upper and lower ends of the branch circuit. In this way, in conjunction with the frame circuit breaker 50, both ends of the branch circuit can be effectively disconnected when an electrical component in the cabinet 10 fails. This ensures that no matter where the fault occurs in the branch circuit, the faulty line can be quickly isolated, preventing the fault from spreading or causing further damage to other equipment, thereby improving the stability and reliability of the photovoltaic combiner cabinet 100.

[0040] Furthermore, in one possible implementation, such as Figure 2 and Figure 8As shown, there are multiple fuses 30, and an insulating baffle 65 is installed between two adjacent fuses 30. Thus, by installing the insulating baffle 65 between adjacent fuses 30, direct electrical contact between the fuses 30 can be effectively avoided, reducing safety hazards caused by arcing or short circuits. The insulating baffle 65 can prevent current from flowing through the path between adjacent fuses 30, reducing the risk of electrical short circuits and ensuring the safe operation of the photovoltaic combiner cabinet 100.

[0041] Furthermore, adjacent fuses 30 are separated by insulating baffles 65, allowing each fuse 30 to be installed individually. This makes the status of each fuse 30 more readily visible. Operators can quickly determine whether a fuse 30 is working properly or needs replacement by observing the indicator markings, windows, or status displays on the fuse 30, facilitating its installation and replacement.

[0042] Meanwhile, the insulating baffle 65 also serves as an isolation mechanism. If one fuse 30 fails or blows, the other fuses 30 remain unaffected and can continue operating, preventing the entire photovoltaic combiner cabinet 100 from shutting down due to a single fuse 30 failure. This design improves the reliability of the photovoltaic combiner cabinet 100, ensuring that it only partially shuts down in the event of a fault, rather than failing completely.

[0043] Furthermore, such as Figure 9 As shown, in one possible implementation, the insulating baffle 65 has openings 651. Therefore, the design of the openings 651 on the insulating baffle 65 promotes airflow inside the cabinet 10, preventing airflow obstruction in localized areas. Because the fuse 30 and other electrical components generate heat during operation, the openings 651 in the insulating baffle 65 allow hot air to quickly escape from the cabinet 10, carrying away excess heat and preventing excessively high temperatures in localized areas within the photovoltaic combiner cabinet 100. Specifically, there can be multiple openings 651.

[0044] Furthermore, such as Figure 2As shown, in one possible implementation, the photovoltaic combiner cabinet 100 further includes a secondary control device 71, which is housed in the cabinet 10. Specifically, the cabinet 10 includes a secondary control room 11 that houses the secondary control device 71. Thus, the secondary control device 71 is separated from the main electrical equipment such as branch circuits and placed in an independent secondary control room 11. The physical isolation between the control circuit and the main circuit effectively avoids interference from high-voltage electrical components to the low-voltage control device. Furthermore, the centralized location of the secondary control device 71 in the secondary control room 11 facilitates unified control and management of the entire photovoltaic combiner cabinet 100. Through the secondary control device 71, intelligent management functions such as automatic monitoring, data acquisition, and remote operation of the photovoltaic combiner cabinet 100 can be achieved. The secondary control device 71 may specifically include a miniature circuit breaker, a power module, and terminal blocks.

[0045] Regarding the location of the secondary control room 11, it can be located in the upper right part of the cabinet 10. The cabinet door of the secondary control room 11 can be opened to the right to facilitate the maintenance of the secondary control device 71.

[0046] Furthermore, such as Figure 2 As shown, in one possible implementation, the photovoltaic combiner cabinet 100 further includes an auxiliary transformer 73, which is housed in the cabinet 10 and supplies power to the secondary control device 71. Therefore, by adding an auxiliary transformer 73 to the photovoltaic combiner cabinet 100 and specifically supplying power to the secondary control device 71, not only is power isolation and stable supply achieved in the photovoltaic combiner cabinet 100, reducing the impact of main circuit faults on the control section, but the safety, reliability, and scalability of the photovoltaic combiner cabinet 100 are also improved, further enhancing the overall performance of the photovoltaic combiner cabinet 100. Furthermore, the auxiliary transformer 73 can provide a regulated power supply, ensuring the normal operation of the secondary control device 71 under different load conditions. Thus, regardless of voltage or current fluctuations in the main circuit, the secondary control device 71 can operate stably, preventing system malfunction or loss of control due to unstable power supply.

[0047] Specifically, the cabinet 10 includes an auxiliary transformer compartment 12 that houses the auxiliary transformer 73. Thus, the auxiliary transformer 73 is housed within the auxiliary transformer compartment 12, physically isolated from other electrical components (such as the main circuit and secondary control devices 71). This isolation effectively prevents power fluctuations or faults in the main circuit from affecting the auxiliary transformer 73 and the control system it supplies, increasing the safety of the photovoltaic combiner cabinet 100.

[0048] Regarding the location of the auxiliary transformer room 12, it can be located in the upper left part of the cabinet 10, and the door of the secondary control room 11 can be opened to the left to facilitate maintenance of the auxiliary transformer 73. The auxiliary transformer room 12 and the secondary control room 11 can be located on the same floor of the cabinet 10.

[0049] Furthermore, in one possible implementation, such as Figure 3 As shown, the photovoltaic combiner cabinet 100 also includes several power interfaces 72, which are housed within the cabinet 10. This design of the power interfaces 72 enhances the flexibility and adaptability of the photovoltaic combiner cabinet 100, supporting various power inputs and load device connections to meet the power requirements of different regions and application scenarios. Furthermore, centralized management of the power interfaces 72 reduces external wiring workload, simplifies installation and maintenance, and lowers overall installation costs and time.

[0050] Specifically, the cabinet 10 includes a power interface chamber 13 for the power interface 72. This allows for the integrated installation of the power interface 72. This integrated installation optimizes the space utilization of the photovoltaic combiner cabinet 100, making the cabinet 10 more compact and reducing its overall size.

[0051] Furthermore, in one possible implementation, such as Figure 5 , Figure 6 and Figure 7 As shown, the photovoltaic combiner cabinet 100 also includes a heat dissipation component 80, which is disposed in the cabinet 10 to dissipate heat from the photovoltaic combiner cabinet 100. Thus, the heat dissipation component 80 helps the photovoltaic combiner cabinet 100 to effectively dissipate heat, absorbing heat from electrical components and other equipment and dissipating it to the external environment. This maintains a suitable temperature inside the cabinet 10, ensuring the stable operation of the photovoltaic combiner cabinet 100 in high-temperature environments, thereby improving the stability and service life of the photovoltaic combiner cabinet 100.

[0052] Furthermore, in one possible implementation, the heat dissipation assembly 80 includes an air inlet louver 81, an exhaust fan 82, and an air outlet 83; the air inlet louver 81 is located on at least one side of the cabinet 10, and the cabinet 10 houses the exhaust fan 82 and the air outlet 83. Thus, the combined design of the ventilation louvers, exhaust fan 82, and air outlet 83 creates an effective air circulation within the cabinet 10, thereby accelerating heat exchange and dissipation, ensuring that the photovoltaic combiner cabinet 100 maintains a suitable temperature range even under prolonged high-load operation, and preventing equipment failure caused by high temperatures.

[0053] Specifically, the air inlet louvers 81 can be installed on the lower front and side of the cabinet 10, and are located on the cabinet door of the cabinet 10. The exhaust fan 82 can be installed at the top of the cabinet 10, and there are multiple air outlets 83 located above the exhaust fan 82. The air outlets 83 can be located at the front and back of the cabinet 10. The cabinet 10 also houses a fan box, and the exhaust fan 82 is installed inside the fan box. One or more fans can be selected according to the project configuration.

[0054] For the specific exhaust fan heating method, the air inlet louver 81 is connected to the outside air, allowing outside air to enter the cabinet 10 and dissipate heat from the heat-generating components inside the cabinet 10 (isolation switch 20, fuse 30, branch line, busbar 40, etc.). Afterwards, the exhaust fan 82 rotates, expelling the dissipated hot air from the air outlet 83.

[0055] In the description of this specification, the references to terms such as "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] Furthermore, the above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A photovoltaic combiner cabinet, characterized in that, The photovoltaic combiner cabinet includes a cabinet body and several branch circuits. The cabinet body houses the branch circuits, and the branch circuits are located on at least one side of the cabinet body. The branch circuits include: disconnect switches, fuses, busbars, and frame circuit breakers. The lower port of the disconnecting switch is connected to an external cable via a first busbar, the upper port of the disconnecting switch is connected to the lower port of the fuse via a first branch line, the upper port of the fuse is connected to the busbar via a second branch line, the lower port of the frame circuit breaker is connected to the busbar, and the upper port of the frame circuit breaker is connected to external equipment via a second busbar.

2. The photovoltaic combiner cabinet according to claim 1, characterized in that, The photovoltaic combiner cabinet also includes a secondary control device, which is housed within the cabinet.

3. The photovoltaic combiner cabinet according to claim 2, characterized in that, The photovoltaic combiner cabinet also includes an auxiliary transformer, which is housed in the cabinet and supplies power to the secondary control device.

4. The photovoltaic combiner cabinet according to claim 1, characterized in that, The photovoltaic combiner cabinet also includes several power interfaces, and the cabinet houses the power interfaces.

5. The photovoltaic combiner cabinet according to claim 1, characterized in that, It also includes a heat dissipation component, which is installed in the cabinet to dissipate heat from the photovoltaic combiner cabinet.

6. The photovoltaic combiner cabinet according to claim 5, characterized in that, The heat dissipation components include air inlet louvers, an exhaust fan, and an air outlet. The air inlet louvers are located on at least one side of the cabinet, and the cabinet houses the exhaust fan and the air outlet.

7. The photovoltaic combiner cabinet according to claim 1, characterized in that, The number of fuses is multiple, and an insulating baffle is provided between two adjacent fuses.

8. The photovoltaic combiner cabinet according to claim 7, characterized in that, The insulating baffle has openings.

9. A photovoltaic system, characterized in that, The photovoltaic system includes a photovoltaic combiner cabinet as described in any one of claims 1 to 8.

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