Inverter assembly and photovoltaic power generation system with same

Abstract

The utility model discloses an inverter assembly and a photovoltaic power generation system with the same, and the inverter assembly comprises an inverter circuit board which is connected with an inverter circuit; the input terminal is connected to the surface of one side of the inverter circuit board, and the input terminal is electrically connected with the inverter circuit and is suitable for being electrically connected with a photovoltaic group string; and the arc discharge detection module is connected to the surface of the other side of the inverter circuit board, and the arc discharge detection module is electrically connected with a circuit of the inverter assembly of the inverter circuit board. The inverter assembly provided by the embodiment of the utility model has the advantages of high integration degree, small size and the like.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to an inverter component and a photovoltaic power generation system having the same. Background Technology

[0002] Fire is the most economically damaging accident for photovoltaic power generation systems. If installed on factory or residential rooftops, it can also easily endanger personal safety. In the event of a fire in a photovoltaic power station, water should not be used to extinguish it directly. The first priority is to cut off the power supply as quickly as possible. Many factors contribute to fires in photovoltaic power stations, with DC arcing being a major cause. The DC side voltage in a photovoltaic system typically reaches 600-1000V. Loose connections at photovoltaic module joints, poor contact, damp wires, and broken insulation can easily lead to DC arcing. DC arcing causes a rapid increase in temperature at the contact points. A sustained arc can generate temperatures of 3000-7000℃, accompanied by high-temperature carbonization of surrounding components. This can result in fuses and cables blowing, or even the burning of modules and equipment, causing a fire.

[0003] Photovoltaic inverters in related technologies have DC arcing detection capabilities, which can quickly detect arcing faults and trigger alarms, disconnecting the power supply and other measures to prevent fires and ensure the safety of photovoltaic power plants. However, the arcing detection device in these technologies is bulky, requiring separate structural components for installation and sufficient wiring space, which occupies a significant amount of internal space, resulting in a relatively large machine and increased costs. Furthermore, the DC wiring harness must pass through the arcing detection device, increasing wiring and manufacturing costs, complicating operation, and potentially leading to messy wiring. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide an inverter assembly that has advantages such as high integration and reduced size.

[0005] This utility model also proposes a photovoltaic power generation system with an inverter assembly.

[0006] To achieve the above objectives, an inverter assembly is provided according to an embodiment of the first aspect of this utility model, comprising: an inverter circuit board connected to an inverter circuit; an input terminal connected to one side surface of the inverter circuit board, the input terminal being electrically connected to the inverter circuit and adapted to be electrically connected to a photovoltaic string; and an arc detection module connected to the other side surface of the inverter circuit board, the arc detection module being electrically connected to the inverter circuit of the inverter circuit board.

[0007] The inverter assembly according to the present invention has advantages such as high integration and reduced size.

[0008] According to some specific embodiments of this utility model, the input terminals are arranged in multiple groups along the length of the inverter circuit board.

[0009] Furthermore, each set of input terminal components includes a positive terminal and a negative terminal, the positive terminal and the negative terminal being arranged along the width direction of the inverter circuit board, and the arc detection module being located between the positive terminal and the negative terminal in the width direction of the inverter circuit board.

[0010] According to some specific embodiments of the present invention, the arc detection module includes: a housing, the housing being mounted on the inverter circuit board; and an arc detection unit, the arc detection unit being mounted inside the housing and connected to a detection circuit, the detection circuit being electrically connected to the inverter circuit.

[0011] Furthermore, the arc detection unit includes: a plurality of detection coils, the plurality of detection coils being arranged at intervals along the length direction of the inverter circuit board; and an arc detection circuit board, the arc detection circuit board being connected to the inverter circuit board and surrounding each of the detection coils.

[0012] According to some specific embodiments of this utility model, the inverter circuit board is connected to a conductive strip. One end of the conductive strip passes through the housing and the detection coil and is connected to the inverter circuit board. The other end of the conductive strip is connected to the inverter circuit board from outside the housing.

[0013] According to some specific embodiments of the present invention, the housing is configured with a limiting post at the corresponding position of the detection coil, the detection coil is surrounded by the limiting post, and a clearance hole is configured at the center of the limiting post. One end of the conductive strip passes through the clearance hole to connect with the inverter circuit board.

[0014] According to some specific embodiments of the present invention, the inverter circuit board is configured with a socket, and the input terminal is configured with a post, the post being inserted into the socket so that the input terminal is mounted on the inverter circuit board.

[0015] According to some specific embodiments of this utility model, the arc detection module is welded to the inverter circuit board.

[0016] A photovoltaic power generation system is provided according to a second aspect of the present invention, comprising: an inverter assembly according to the above embodiments of the present invention.

[0017] The photovoltaic power generation system according to the embodiments of the present invention has advantages such as high integration and reduced size by utilizing the inverter components according to the above embodiments of the present invention.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of the internal structure of the inverter assembly according to an embodiment of the present utility model;

[0021] Figure 2 This is a side view of the inside of an inverter assembly according to an embodiment of the present utility model;

[0022] Figure 3 This is a top view of the interior of an inverter assembly according to an embodiment of the present utility model;

[0023] Figure 4 This is a partial schematic diagram of the input terminal of an inverter assembly according to an embodiment of the present invention.

[0024] Figure label:

[0025] Inverter assembly 1, inverter circuit board 100, input terminal 200, arc detection module 300,

[0026] Positive extreme 210, negative extreme 220,

[0027] Housing 310, arc detection unit 320, detection coil 321, arc detection circuit board 322

[0028] Conductive strip 110, limiting post 311, clearance hole 312, insertion hole 120, insertion post 211. Detailed Implementation

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] In the description of this utility model, "first feature" and "second feature" may include one or more of the features.

[0031] In the description of this utility model, "multiple" means two or more.

[0032] In the description of this utility model, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0033] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0034] The inverter assembly 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0035] like Figures 1-4 As shown, according to an embodiment of the present invention, an inverter assembly 1 is provided, including: an inverter circuit board 100, an input terminal 200, and an arc detection module 300.

[0036] Inverter circuit board 100 is connected to inverter circuitry. Input terminal 200 is connected to one side of inverter circuit board 100, and is electrically connected to the inverter circuitry and adapted to be electrically connected to a photovoltaic string. Arc detection module 300 is connected to the other side of inverter circuit board 100, and is electrically connected to the inverter circuitry of inverter circuit board 100.

[0037] For example, the inverter assembly 1 of the utility model is based on a 150kW inverter assembly. The inverter circuit can be an inverter input circuit, and the inverter circuit board 100 is constructed into a rectangular structure, forming an input filter circuit and an inverter circuit. The input terminal 200 is connected to the output terminal of the photovoltaic string. The arc detection module 300 is connected to the inverter circuit board 100 for detecting DC arc faults.

[0038] According to the inverter assembly 1 of this utility model embodiment, the inverter circuit connected to the input terminal 200 is connected to the arc detection module 300. The arc detection module 300 performs arc detection and is connected to the inverter circuit board 100. When an arcing hazard occurs, it collects DC arcing fault information through the circuit and sends an alarm message through the communication circuit to disconnect the circuit. By integrating the arc detection module 300 into the inverter circuit, the arc detection device and the inverter assembly 1 are integrated into one unit. This allows the arc detection module 300 to be integrated with the input circuit without the need for an additional bracket for the arc detection device, greatly reducing the space occupied and the size of the inverter assembly 1. Furthermore, the input terminal 200 and the arc detection module 300 are located on opposite sides of the circuit board, saving space on the inverter assembly 1 circuit board and avoiding overly dense arrangement on the inverter circuit board, making installation and operation simpler.

[0039] Therefore, the inverter assembly 1 according to the present invention has advantages such as high integration and reduced size.

[0040] In some specific embodiments of this utility model, such as Figure 1 As shown, the input terminals 200 are arranged in multiple groups along the length of the inverter circuit board 100. This allows for the connection of different numbers of input terminals 200, providing greater flexibility.

[0041] Furthermore, such as Figure 1 and Figure 2 As shown, each set of 200 input terminals includes a positive terminal 210 and a negative terminal 220, which are arranged along the width direction of the inverter circuit board 100. The arc detection module 300 is located between the positive terminal 210 and the negative terminal 220 in the width direction of the inverter circuit board 100.

[0042] For example, the positive terminal 210 and the negative terminal 220 are symmetrically arranged on both sides of the inverter circuit board 100, while the arc detection module 300 is located on the other side of the inverter circuit board 100. This arrangement does not occupy a large amount of space on one side of the inverter circuit board 100, resulting in a more rational circuit layout. Furthermore, the input terminal 200 can be detachable, making assembly and disassembly more convenient. The electrical connection wires on the inverter circuit board 100 are also more dispersed.

[0043] In some specific embodiments of this utility model, such as Figure 1 As shown, the arc detection module 300 includes: a housing 310 and an arc detection unit 320.

[0044] The housing 310 is mounted on the inverter circuit board 100. The arc detection unit 320 is mounted inside the housing 310 and connected to the detection circuit, which is electrically connected to the inverter circuit. For example, the housing 310 is a semi-enclosed structure, the arc detection unit 320 is protected by the housing 310, and the housing 310 provides a certain degree of insulation for the internal detection coil 321 and detection circuit.

[0045] Furthermore, such as Figure 3 As shown, the arc detection unit 320 includes a plurality of detection coils 321 and an arc detection circuit board 322. The plurality of detection coils 321 are arranged at intervals along the length direction of the inverter circuit board 100. The arc detection circuit board 322 is connected to the inverter circuit board 100 and surrounds each detection coil 321.

[0046] For example, such as Figure 1 As shown, four detection coils 321 are set. The number of detection coils 321 can be determined according to the number of input terminals 200.

[0047] Furthermore, such as Figure 3 As shown, the inverter circuit board 100 is connected to a conductive strip 110. One end of the conductive strip 110 passes through the housing 310 and the detection coil 321 and is connected to the inverter circuit board 100. The other end of the conductive strip 110 is connected to the inverter circuit board 100 from outside the housing 310.

[0048] For example, the conductive strip 110 is a copper strip. The conductive strip 110 makes full use of the space in the center of the detection coil 321, and both ends of the conductive strip 110 are connected to the inverter circuit board 100 to ensure the electrical connection of the circuit board.

[0049] In some specific embodiments of this utility model, such as Figure 3 As shown, the housing 310 has a limiting post 311 at the corresponding position of the detection coil 321. The detection coil 321 is surrounded by the limiting post. A clearance hole 312 is formed at the center of the limiting post 311. One end of the conductive strip 110 passes through the clearance hole 312 to connect with the inverter circuit board 100. By constructing the limiting post 311, the conductive strip 110 and the detection coil 321 can be separated, thereby ensuring good insulation between the detection coil 321 and the conductive strip 110.

[0050] In some specific embodiments of this utility model, such as Figure 4 As shown, the inverter circuit board 100 is configured with a socket 120, and the input terminal 200 is configured with a plug 211. The plug 211 is inserted into the socket 120 so that the input terminal 200 is mounted on the inverter circuit board 100.

[0051] The inverter circuit board 100 and the input terminal 200 are respectively configured with sockets 120 and posts 211, realizing the detachable function of the input terminal 200 and the inverter circuit board 100. For example, the input terminal 200 can use ordinary PV terminals or onboard PV terminals. When using onboard PV terminals, no wiring harness is required, which can save additional DC detection wiring harness and processing and manufacturing costs.

[0052] In some specific embodiments of this utility model, the arc detection module 300 is welded to the inverter circuit board 100. This establishes an electrical connection between the arc detection module 300 and the inverter circuit board 100, improving the stability of the arc detection module 300. Furthermore, the arc detection module 300 is wave-soldered onto the inverter circuit board 100 to detect DC arc faults, thus integrating the arc detection module 300 into the inverter to form a single, integrated structure, achieving miniaturization of the inverter component 1.

[0053] The following describes a photovoltaic power generation system according to an embodiment of the present invention.

[0054] A photovoltaic power generation system according to an embodiment of the present invention includes: an inverter assembly 1 according to the above embodiment of the present invention.

[0055] The photovoltaic power generation system according to the present invention has advantages such as high integration and reduced size by using the inverter component 1 according to the above embodiment of the present invention.

[0056] The inverter assembly 1 and other components and operations of the photovoltaic power generation system according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0057] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0058] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An inverter assembly, characterized in that, include: An inverter circuit board having an inverter circuit; An input terminal is connected to one side surface of the inverter circuit board. The input terminal is electrically connected to the inverter circuit and is adapted to be electrically connected to a photovoltaic string. An arc detection module is connected to the other side of the inverter circuit board and is electrically connected to the inverter circuit.

2. The inverter assembly according to claim 1, characterized in that, The input terminals are arranged in multiple groups along the length of the inverter circuit board.

3. The inverter assembly according to claim 2, characterized in that, Each set of input terminal components includes: A positive terminal and a negative terminal are arranged along the width direction of the inverter circuit board, and the arc detection module is located between the positive terminal and the negative terminal in the width direction of the inverter circuit board.

4. The inverter assembly according to claim 1, characterized in that, The arc detection module includes: Housing, the housing being mounted on the inverter circuit board; An arcing detection unit is installed inside the housing and connected to a detection circuit, which is electrically connected to the inverter circuit.

5. The inverter assembly according to claim 4, characterized in that, The arc detection unit includes: Multiple detection coils are arranged at intervals along the length of the inverter circuit board. An arc detection circuit board is connected to the inverter circuit board and surrounds each of the detection coils.

6. The inverter assembly according to claim 5, characterized in that, The inverter circuit board is connected to a conductive strip. One end of the conductive strip passes through the housing and the detection coil and is connected to the inverter circuit board. The other end of the conductive strip is connected to the inverter circuit board from outside the housing.

7. The inverter assembly according to claim 6, characterized in that, The housing has a limiting post at the corresponding position of the detection coil. The detection coil is surrounded by the limiting post. A clearance hole is formed at the center of the limiting post. One end of the conductive strip passes through the clearance hole to connect with the inverter circuit board.

8. The inverter assembly according to claim 1, characterized in that, The inverter circuit board has a socket, and the input terminal has a post. The post is inserted into the socket so that the input terminal is mounted on the inverter circuit board.

9. The inverter assembly according to claim 1, characterized in that, The arc detection module is welded to the inverter circuit board.

10. A photovoltaic power generation system, characterized in that, include: The inverter assembly according to any one of claims 1-9.

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