A photovoltaic inverter integrated with a direct current distribution unit

Abstract

The utility model discloses a photovoltaic inverter of integrated direct current distribution unit relates to photovoltaic power conversion equipment technical field. This photovoltaic inverter of integrated direct current distribution unit, including inverter body, is equipped with photovoltaic inverter module and direct current distribution cavity in the inverter body, is fixedly installed with direct current distribution unit in the direct current distribution cavity, the direct current distribution unit includes direct current input terminal row, direct current busbar, direct current lightning protection module, direct current circuit breaker and positioning strip, and the positioning bolt is inserted in the positioning strip, the direct current distribution unit includes direct current input terminal row, direct current busbar, direct current lightning protection module, direct current circuit breaker and is fixedly installed on the positioning strip through the positioning bolt. This photovoltaic inverter of integrated direct current distribution unit, through the positioning bolt to each element is fixed, and it is convenient to add according to the use demand to each element, need not to set up direct current distribution equipment alone, has reduced the system equipment quantity.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power conversion equipment technology, specifically a photovoltaic inverter with an integrated DC power distribution unit. Background Technology

[0002] In a grid-connected photovoltaic power generation system, the photovoltaic inverter is the core equipment, which converts the direct current generated by the photovoltaic modules into alternating current that meets the requirements of the power grid.

[0003] In traditional photovoltaic systems, the photovoltaic inverter and the DC power distribution unit are two independent devices: the DC power generated by the photovoltaic modules is first sent to the independent DC power distribution unit, and after the DC power distribution unit performs current collection, lightning protection, and overload protection, it is then connected to the DC input terminal of the photovoltaic inverter through a cable.

[0004] The DC power distribution unit and the photovoltaic inverter need to be fixedly installed separately, and an additional DC connection cable needs to be laid between them, which increases the installation process and labor costs. The two independent devices need to occupy installation space separately, which makes them less suitable for photovoltaic applications with limited space, such as rooftops and containers. Utility Model Content

[0005] The purpose of this utility model is to provide a photovoltaic inverter with an integrated DC power distribution unit to solve the problems mentioned in the background art, which require separate fixed installation of the DC power distribution unit and the photovoltaic inverter, and additional DC connection cables between the two, which increases the installation process and labor costs; the two independent devices need to occupy installation space separately, which is particularly unsuitable for photovoltaic applications with limited space such as rooftops and containers.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a photovoltaic inverter with an integrated DC power distribution unit, comprising an inverter body, wherein a photovoltaic inverter module and a DC power distribution cavity are disposed within the inverter body, and a DC power distribution unit is fixedly installed within the DC power distribution cavity. The DC power distribution unit includes a DC input terminal block, a DC busbar, a DC surge protection module, a DC circuit breaker, and a positioning strip, wherein positioning bolts are inserted into the positioning strip; the DC input terminal block, the DC busbar, the DC surge protection module, and the DC circuit breaker are fixedly installed on the positioning strip by the positioning bolts; the input end of the DC input terminal block is used to connect to an external photovoltaic module, and the output end is electrically connected to the input end of the DC busbar; the output end of the DC busbar is divided into two paths, one path being grounded through the DC surge protection module, and the other path being electrically connected to the DC input end of the photovoltaic inverter module through the DC circuit breaker.

[0007] Preferably, the inverter body has a movable maintenance cover plate on the outer shell corresponding to the DC power distribution cavity. The maintenance cover plate is inserted into the outside of the inverter body. The inverter body has a wire hole on the outer shell, and a waterproof sealing ring is provided at the wire hole.

[0008] Preferably, an insulating partition is provided between the DC power distribution cavity and the photovoltaic inverter module. The insulating partition has a through hole for the DC busbar to pass through, and a waterproof sealing ring is provided in the through hole.

[0009] Preferably, the DC input terminal block is provided with at least two sets, and each set of the DC input terminal block is connected to a photovoltaic module.

[0010] Preferably, the DC circuit breaker is a dedicated DC circuit breaker with overload protection and short-circuit protection functions, and its rated current is matched with the maximum DC input current of the photovoltaic inverter module.

[0011] Preferably, the DC surge protection module is a composite surge protector. The DC surge protection module is connected to a grounding component, which includes a varistor and a gas discharge tube. The varistor and the gas discharge tube are connected in series between the DC busbar and the ground.

[0012] Preferably, the insulating partition is made of epoxy resin with a thickness of not less than 3mm and a breakdown voltage of not less than 20kV; the waterproof sealing ring is made of polytetrafluoroethylene.

[0013] Preferably, the inspection cover is made of transparent PC material, and the waterproof sealing ring is made of silicone rubber.

[0014] The technical effects and advantages of this utility model are as follows:

[0015] 1. The photovoltaic inverter of this integrated DC power distribution unit is equipped with positioning bars, and each component is fixed by positioning bolts, which facilitates the addition of each component according to the usage requirements.

[0016] 2. By integrating the DC power distribution unit into the inverter body, there is no need to set up a separate DC power distribution device, which reduces the number of system devices and simplifies the overall structure of the photovoltaic system; only the inverter needs to be installed and fixed once, without the need to lay additional DC connection cables, reducing installation procedures and labor costs, while significantly saving equipment space, making it suitable for space-constrained scenarios.

[0017] 3. This photovoltaic inverter with integrated DC power distribution unit eliminates the external cable connection between the inverter and the DC power distribution unit, reduces contact points, lowers the risk of heat generation, oxidation and failure, and improves the reliability of system operation.

[0018] 4. This photovoltaic inverter with integrated DC power distribution unit achieves electrical isolation between the DC power distribution cavity and the photovoltaic inverter module through an insulating partition. It is also equipped with a DC surge protection module and a DC circuit breaker to effectively prevent the risks of lightning strikes, overloads and short circuits. In addition, the installation of temperature sensors can prevent the DC power distribution unit from overheating and further improve safety. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the cabinet structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the DC power distribution unit of this utility model.

[0023] In the diagram: 1. Inverter body; 11. Wiring hole; 12. Waterproof sealing ring; 2. Photovoltaic inverter module; 3. DC power distribution chamber; 4. DC power distribution unit; 41. DC input terminal block; 42. DC busbar; 43. DC surge protection module; 431. Grounding component; 44. DC circuit breaker; 45. Positioning strip; 451. Positioning bolt; 5. Inspection cover plate; 6. Insulating partition. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] This utility model discloses a photovoltaic inverter with an integrated DC power distribution unit, according to the attached... Figures 1 to 2 As shown, the inverter body 1 is made of aluminum alloy, which combines lightweight and heat dissipation performance. The inverter body 1 is divided into a photovoltaic inverter module 2 and a DC power distribution cavity 3 by a sheet metal bracket. The DC power distribution cavity 3 is located on one side of the inverter body 1 for easy wiring. The DC power distribution unit 4 is fixedly installed in the DC power distribution cavity 3 by positioning bolts 451.

[0026] According to the appendix Figures 1 to 3 As shown, the DC power distribution unit 4 further includes a DC input terminal block 41, a DC busbar 42, a DC surge protection module 43, a DC circuit breaker 44, and a positioning strip 45. The DC input terminal block 41, DC busbar 42, DC surge protection module 43, and DC circuit breaker 44 are fixedly mounted on the positioning strip 45 by positioning bolts 451. The DC input terminal block 41 has 3 sets, each equipped with 4 terminals, which can connect 4 photovoltaic modules. The 3 sets realize the busbar input of 12 photovoltaic modules, meeting the needs of medium and high power photovoltaic systems. The terminals are made of copper and tin-plated to reduce contact resistance. The DC busbar 42 uses T2 purple steel. The device is made of copper, with a thickness of 5mm and a width of 30mm, ensuring that its current-carrying capacity meets the maximum DC input current of the photovoltaic inverter module 2. The DC surge protection module 43 is a composite surge protector, which integrates a grounding component 431. The grounding component 431 includes a varistor and a gas discharge tube. After being connected in series, one end is connected to the DC busbar 42, and the other end is connected to the grounding terminal of the inverter body 1 through a grounding wire to achieve surge protection. The DC circuit breaker 44 is a dedicated DC circuit breaker with overload protection and short-circuit protection functions. Its input end is welded to the DC busbar 42, and its output end is bolted to the DC input end of the photovoltaic inverter module 2 through a copper core cable.

[0027] According to the appendix Figures 1 to 2 As shown, furthermore, an inspection cover 5 is inserted into the outer side of the inverter body 1 corresponding to the DC power distribution cavity 3. The inspection cover 5 is made of transparent PC material, which makes it easy to observe the operating status of the DC power distribution unit 4. The inverter body 1 has wire holes 11. Each wire hole 11 is fitted with a silicone rubber waterproof sealing ring 12, and the waterproof rating reaches IP65, which is suitable for outdoor environments.

[0028] According to the appendix Figures 1 to 2 As shown, a special disclosure indicates that an epoxy resin insulating partition 6 is provided between the DC power distribution cavity 3 and the photovoltaic inverter module 2. The insulating partition 6 has a thickness of 3mm and a breakdown voltage of ≥20kV, effectively achieving electrical isolation. The insulating partition 6 has a wire hole 11 for the DC busbar 42 to pass through. A polytetrafluoroethylene waterproof sealing ring 12 is fitted inside the wire hole 11 to prevent the DC busbar 42 from directly contacting the insulating partition 6, causing wear or insulation failure.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A photovoltaic inverter with an integrated DC power distribution unit, comprising an inverter body (1), wherein the inverter body (1) is provided with a photovoltaic inverter module (2) and a DC power distribution cavity (3), and a DC power distribution unit (4) is fixedly installed in the DC power distribution cavity (3), characterized in that, The DC power distribution unit (4) includes a DC input terminal block (41), a DC busbar (42), a DC surge protection module (43), a DC circuit breaker (44), and a positioning strip (45). A positioning bolt (451) is inserted into the positioning strip (45). The DC input terminal block (41), the DC busbar (42), the DC surge protection module (43), and the DC circuit breaker (44) are fixedly installed on the positioning strip (45) by the positioning bolt (451). The input end of the DC input terminal block (41) is used to connect to the external photovoltaic module, and the output end is electrically connected to the input end of the DC busbar (42). The output end of the DC busbar (42) is divided into two paths. One path is grounded through the DC surge protection module (43), and the other path is electrically connected to the DC input end of the photovoltaic inverter module (2) through the DC circuit breaker (44).

2. A photovoltaic inverter with an integrated DC power distribution unit according to claim 1, characterized in that, The inverter body (1) has a movable maintenance cover (5) on its outer shell corresponding to the DC power distribution cavity (3). The maintenance cover (5) is inserted into the outside of the inverter body (1). The inverter body (1) has a wire hole (11) on its outer shell. A waterproof sealing ring (12) is provided at the wire hole (11).

3. A photovoltaic inverter with an integrated DC power distribution unit according to claim 1, characterized in that, An insulating partition (6) is provided between the DC power distribution cavity (3) and the photovoltaic inverter module (2). The insulating partition (6) has a wire hole (11) for the DC busbar (42) to pass through, and a waterproof sealing ring (12) is provided in the wire hole (11).

4. A photovoltaic inverter with an integrated DC power distribution unit according to claim 1, characterized in that, The DC input terminal block (41) is provided with at least two sets, and each set of the DC input terminal block (41) is connected to a photovoltaic module.

5. A photovoltaic inverter with an integrated DC power distribution unit according to claim 1, characterized in that, The DC circuit breaker (44) is a dedicated DC circuit breaker with overload protection and short-circuit protection functions, and its rated current is matched with the maximum DC input current of the photovoltaic inverter module (2).

6. A photovoltaic inverter with an integrated DC power distribution unit according to claim 1, characterized in that, The DC surge protection module (43) is a composite surge protector. The DC surge protection module (43) is connected to a grounding component (431). The grounding component (431) includes a varistor and a gas discharge tube. The varistor and the gas discharge tube are connected in series between the DC busbar (42) and the ground.

7. A photovoltaic inverter with an integrated DC power distribution unit according to claim 3, characterized in that, The insulating partition (6) is made of epoxy resin with a thickness of not less than 3mm and a breakdown voltage of not less than 20kV; the waterproof sealing ring (12) is made of polytetrafluoroethylene.

8. A photovoltaic inverter with an integrated DC power distribution unit according to claim 2, characterized in that, The inspection cover (5) is made of transparent PC material, and the waterproof sealing ring (12) is made of silicone rubber.

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