Photovoltaic conversion assembly, photovoltaic AC assembly and photovoltaic system

Abstract

The utility model discloses a photovoltaic conversion assembly, a photovoltaic AC assembly and a photovoltaic system, and relates to the field of photovoltaic technology, and the photovoltaic conversion assembly comprises a micro inverter and a micro storage unit. The output end of the micro inverter is provided with a first connecting terminal and a second connecting terminal, the first connecting terminal is used for being connected with an adjacent photovoltaic module in parallel, and the second connecting terminal is used for being connected with electrical equipment or a grid-connected system; and the micro storage unit is connected with the micro inverter. According to the photovoltaic conversion assembly provided by the invention, direct grid connection can be realized through the second connecting terminal at the output end of the micro inverter without accessing an alternating current main cable, and meanwhile, direct current of the photovoltaic assembly can be stored through the micro storage unit, so that when the photovoltaic assembly does not generate power, the direct current can be saved; and the micro storage unit can convert the direct current into alternating current through the micro inverter for grid connection, so that the output efficiency of the photovoltaic system is ensured, and the stability of the photovoltaic system is improved.

Description

Technical Field

[0001] This application relates to the field of photovoltaic technology, and more specifically, to a photovoltaic conversion module, a photovoltaic AC module, and a photovoltaic system. Background Technology

[0002] Traditional photovoltaic systems generally consist of DC modules and inverters. When the inverter malfunctions or some photovoltaic modules are damaged, or affected by local shading, dirt, tilt angle, orientation, different aging levels, or small cracks, the photovoltaic system configuration will be mismatched, resulting in a decrease in output efficiency.

[0003] Therefore, how to improve the stability of photovoltaic systems while ensuring their output efficiency has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a photovoltaic conversion module that improves the stability of the photovoltaic system while ensuring the output efficiency of the photovoltaic system.

[0005] Another objective of this application is to provide a photovoltaic AC module having the aforementioned photovoltaic conversion components.

[0006] Another objective of this application is to provide a photovoltaic system having the aforementioned photovoltaic AC components.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] A photovoltaic conversion module, comprising:

[0009] A micro inverter, wherein the output terminal of the micro inverter is provided with a first connection terminal and a second connection terminal, the first connection terminal being used to connect in parallel with an adjacent photovoltaic module, and the second connection terminal being used to connect with electrical equipment or a grid-connected system;

[0010] A micro-storage unit, which is connected to the micro-inverter.

[0011] Optionally, in the above-mentioned photovoltaic conversion module, there are two first connection terminals, and the first connection terminal is one of a male terminal and a female terminal.

[0012] Optionally, in the above-mentioned photovoltaic conversion module, the output end of the microinverter is further provided with a first DC connector, which is connected to the micro-storage unit.

[0013] Optionally, in the above-mentioned photovoltaic conversion module, both the microinverter and the micro-storage unit are rod-shaped structures, and the first DC connector of the microinverter is plugged into the micro-storage unit.

[0014] Optionally, in the photovoltaic conversion module described above, the second connection terminal includes a plug for connecting to electrical equipment or a grid-connected system.

[0015] Optionally, in the photovoltaic conversion module described above, the first connection terminal and the second connection terminal are respectively connected to the output terminal of the micro inverter via AC cables.

[0016] A photovoltaic AC module includes a junction box and a photovoltaic conversion module as described in any of the preceding claims, the junction box being connected to the input terminal of the microinverter.

[0017] Optionally, in the above-mentioned photovoltaic AC module, the input terminal of the microinverter is provided with a second DC connector, and the microinverter is connected to the junction box through the second DC connector.

[0018] Optionally, in the above-mentioned photovoltaic AC module, the positive and negative terminals of the output end of the junction box are connected to the second DC connector via a DC cable.

[0019] Optionally, in the above-mentioned photovoltaic AC module, the end of the DC cable is provided with a plug terminal for plugging into the second DC connector.

[0020] A photovoltaic system includes one or more photovoltaic modules, and each of the photovoltaic modules is provided with a photovoltaic AC module as described in any of the preceding claims.

[0021] The photovoltaic conversion module provided in this application, by providing a first connection terminal and a second connection terminal at the output end of the micro-inverter, allows for parallel connection with the micro-inverter of adjacent photovoltaic modules via the first connection terminal, and connection to electrical equipment or a grid-connected system via the second connection terminal, eliminating the need for a main AC cable for grid connection. Furthermore, a micro-storage unit can be connected to the micro-inverter. When not connected to the grid, it can store the DC power generated by the photovoltaic modules in the micro-storage unit, allowing the micro-storage unit to convert the DC power back to AC power via the micro-inverter for grid connection when the photovoltaic modules are not generating electricity. As can be seen from the above example, the photovoltaic conversion module provided in this application can be directly connected to the grid via the second connection terminal at the output end of the micro-inverter, eliminating the need for a main AC cable. Simultaneously, the micro-storage unit can store the DC power from the photovoltaic modules, allowing the micro-storage unit to convert the DC power back to AC power via the micro-inverter for grid connection when the photovoltaic modules are not generating electricity, thereby ensuring the output efficiency of the photovoltaic system while improving its stability.

[0022] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application 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 embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of a photovoltaic AC module provided in an embodiment of this application;

[0025] Figure 2 An exploded view of a photovoltaic AC module provided in an embodiment of this application;

[0026] Figure 3 A front view of the photovoltaic AC module provided in the embodiments of this application;

[0027] Figure 4 This is a schematic diagram of the structure of a micro inverter provided in an embodiment of this application;

[0028] Figure 5 This is a schematic diagram of the structure of the micro-storage unit provided in the embodiments of this application;

[0029] Figure 6 This is a schematic diagram of photovoltaic AC modules connected in parallel according to an embodiment of this application.

[0030] Among them, 100 is a photovoltaic conversion module, 101 is a micro inverter, 1011 is a first connection terminal, 1012 is a second connection terminal, 102 is a junction box, 103 is a first DC connector, 104 is a DC cable, 1041 is a plug terminal, 105 is a second DC connector, and 106 is an AC cable.

[0031] 200 is a micro-storage unit;

[0032] 300 refers to photovoltaic modules. Detailed Implementation

[0033] The core of this application is to provide a photovoltaic conversion module that improves the stability of the photovoltaic system while ensuring the output efficiency of the photovoltaic system.

[0034] Another core aspect of this application is to provide a photovoltaic AC module having the aforementioned photovoltaic conversion components.

[0035] Another core aspect of this application is to provide a photovoltaic system having the aforementioned photovoltaic AC components.

[0036] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0037] Traditional photovoltaic (PV) systems typically consist of AC PV modules and PV panels. AC PV modules are micro-inverters with integrated protection and control functions installed on the back of each PV module. These micro-inverters convert the direct current (DC) generated by the PV modules into alternating current (AC). Using micro-inverters, maximum power point tracking (MPPT) can be achieved on the PV modules, optimizing the output power of each module to maximize the overall system output. Typically, an AC PV system consists of two or more PV modules, one of which houses the micro-inverter. This micro-inverter has two or more DC input terminals; one connects to a junction box to convert DC to AC output, while the other one or more DC input terminals connect to the DC output terminals of other PV modules, thus forming an AC PV system. When the micro-inverter malfunctions, or when some PV modules are damaged, affected by localized shading, dirt, tilt angle, orientation, varying degrees of aging, or small cracks, the PV system configuration becomes misaligned, leading to a decrease in output efficiency.

[0038] In addition, when connecting photovoltaic AC modules to the grid, each photovoltaic AC module needs to connect the AC output cable on the micro-inverter to an AC cable bus. The AC cable bus is connected to the AC power grid through the distribution box to realize the grid connection of the photovoltaic AC modules. This makes the grid connection process more complicated, and the amount of cables used is large, resulting in higher costs.

[0039] Therefore, such as Figure 1As shown in the figure, this application discloses a photovoltaic conversion module 100, including a micro-inverter 101 and a micro-storage unit 200. The micro-inverter 101 can be directly connected to the grid via its second connection terminal 1012, eliminating the need for a main AC cable, thus improving grid connection convenience, reducing cable usage, and lowering costs. Simultaneously, the micro-storage unit 200 can store the DC power generated by the photovoltaic module 300. When the photovoltaic module 300 is not generating electricity, the micro-storage unit 200 can convert the DC power back into AC power via the micro-inverter 101 for grid connection, thereby ensuring the output efficiency of the photovoltaic system while improving its stability.

[0040] The following will combine Figures 1 to 6 The photovoltaic conversion module 100 disclosed in the embodiments of this application will be explained and described in detail.

[0041] like Figure 1 As shown, the photovoltaic conversion module 100 may include a micro inverter 101 and a junction box 102. The micro-inverter 101 has an input terminal that can be connected to a junction box 102 to transmit the DC power generated by the photovoltaic module 300 to the micro-inverter 101. The micro-inverter 101 has an output terminal with a first connection terminal 1011 and a second connection terminal 1012. The first connection terminal 1011 can be connected in parallel with the micro-inverter 101 of the adjacent photovoltaic module 300, and the second connection terminal 1012 can be connected to electrical equipment or a grid-connected system. This eliminates the need for a main AC cable for grid connection, improving convenience, reducing cable usage, and lowering costs. Furthermore, the micro-storage unit 200 is connected to the micro-inverter 101. When not connected to the grid, the micro-storage unit 200 can store the DC power generated by the photovoltaic module 300. When the photovoltaic module 300 is not generating power, the micro-storage unit 200 can convert the DC power back into AC power via the micro-inverter 101 for grid connection, thus ensuring the output efficiency of the photovoltaic system while improving its stability.

[0042] In some embodiments, such as Figure 3 and Figure 4 As shown, two first connection terminals 1011 can be used, and the first connection terminals 1011 can be connected to the output terminal of the micro-inverter 101 via AC cable 106, so that the two first connection terminals 1011 can be plugged into the first connection terminals 1011 of the micro-inverters 101 of two adjacent photovoltaic modules 300 respectively, thereby realizing the parallel connection between multiple photovoltaic modules 300, such as... Figure 6As shown. Optionally, the first connection terminal 1011 can be either a male terminal or a female terminal. When the first connection terminal 1011 of the microinverter 101 of one photovoltaic module 300 is a male terminal, the first connection terminal 1011 of the microinverter 101 of the adjacent photovoltaic module 300 is a female terminal, thereby facilitating the connection between the two. In this embodiment, the two first connection terminals 1011 of the microinverter 101 of each photovoltaic module 300 are a male terminal and a female terminal, respectively, so as to match with the first connection terminals 1011 of the microinverter 101 of the adjacent photovoltaic module 300, thereby improving the connection efficiency. Of course, the two first connection terminals 1011 of the microinverter 101 of each photovoltaic module 300 can also both be male terminals or female terminals, which will not be elaborated here.

[0043] In some embodiments, such as Figure 2 and Figure 4 As shown, the output terminal of the micro-inverter 101 may be provided with a first DC connector 103, and the first DC connector 103 is connected to the micro-storage unit 200, so that the DC power generated by the photovoltaic module 300 can be stored through the micro-storage unit 200. Optionally, as Figure 4 and Figure 5 As shown, both the micro-inverter 101 and the micro-storage unit 200 can adopt a rod-shaped structure, and the first DC connector 103 of the micro-inverter 101 and the micro-storage unit 200 can be directly connected by plugging and unplugging, which reduces the use of cables, lowers costs, and improves the convenience of connecting the micro-inverter 101 and the micro-storage unit 200.

[0044] In some embodiments, such as Figures 1 to 4 As shown, in order to facilitate grid connection of the photovoltaic module 300, the second connection terminal 1012 can be connected to the output terminal of the micro inverter 101 via the AC cable 106. At the same time, the second connection terminal 1012 may include a plug for connection to electrical equipment or grid connection system, so that the photovoltaic module 300 can be connected to the grid by plugging the plug into the socket of the electrical equipment or the electrical box of the grid connection system.

[0045] After the micro-inverter 101 boosts the DC power into grid-connectable AC power, it can be directly connected to the grid via the second connection terminal 1012. Alternatively, it can be connected in parallel with the AC photovoltaic modules of other photovoltaic modules 300 via the first connection terminal 1011, and then connected to the electrical box of the grid-connected system via the second connection terminal 1012 of the photovoltaic module 300 located at the end. Furthermore, when not connected to the grid, the DC power generated by the photovoltaic module 300 can be stored in the micro-storage unit 200. When the photovoltaic module 300 is not generating power, the micro-storage unit 200 can convert the DC power back into AC power via the micro-inverter 101 for grid connection.

[0046] The photovoltaic conversion module 100 provided in this application has a first connection terminal 1011 and a second connection terminal 1012 at the output end of the micro-inverter 101. It can be connected in parallel with the micro-inverter 101 of an adjacent photovoltaic module 300 via the first connection terminal 1011, and connected to electrical equipment or a grid-connected system via the second connection terminal 1012, eliminating the need for a main AC cable for grid connection. Furthermore, the micro-storage unit 200 can be connected to the micro-inverter 101. When not connected to the grid, it can store the DC power generated by the photovoltaic module 300 in the micro-storage unit 200. When the photovoltaic module 300 is not generating electricity, the micro-storage unit 200 can then convert the DC power back into AC power via the micro-inverter 101 for grid connection.

[0047] The photovoltaic conversion module 100 provided in this application can be directly connected to the grid through the second connection terminal 1012 of the output end of the micro inverter 101 without the need to connect to the main AC cable. At the same time, the DC power of the photovoltaic module 300 can be stored in the micro storage unit 200. When the photovoltaic module 300 is not generating electricity, the micro storage unit 200 can convert the DC power back into AC power through the micro inverter 101 for grid connection, thereby ensuring the output efficiency of the photovoltaic system and improving the stability of the photovoltaic system.

[0048] This application also discloses a photovoltaic AC module, including a junction box 102 and a photovoltaic conversion module, wherein the junction box 102 is connected to the input terminal of a micro-inverter 101. Since the photovoltaic conversion module is the photovoltaic conversion module 100 disclosed in the above embodiments, the photovoltaic AC module has all the technical effects of the photovoltaic conversion module 100, which will not be repeated here.

[0049] In some embodiments, such as Figure 2 and Figure 4 As shown, the input terminal of the microinverter 101 may be equipped with a second DC connector 105, and the microinverter 101 is connected to the junction box 102 through the second DC connector 105. Optionally, the positive and negative terminals of the junction box 102 can be designed in parallel, that is, the positive and negative terminals of the output terminal of the junction box 102 are led out through a DC cable 104 and connected to the second DC connector 105, thereby reducing the amount of cable used, reducing costs and failure rates.

[0050] In some embodiments, such as Figure 2As shown, to facilitate the connection between the DC cable 104 and the second DC connector 105, a plug-in terminal 1041 for insertion into the second DC connector 105 can be provided at the end where the DC cable 104 connects to the second DC connector 105. When the micro inverter 101 is connected to the junction box 102, the plug-in terminal 1041 at the end of the DC cable 104 can be directly plugged into the second DC connector 105 of the micro inverter 101, thereby ensuring a stable connection between the junction box 102 and the micro inverter 101. Optionally, one of the second DC connector 105 and the plug-in terminal 1041 can be a male plug-in terminal, and the other can be a female plug-in terminal. That is, the second DC connector 105 can be a male plug-in terminal, and the plug-in terminal 1041 can be a female plug-in terminal that mates with the second DC connector 105, or the second DC connector 105 can be a female plug-in terminal, and the plug-in terminal 1041 can be a male plug-in terminal that mates with the second DC connector 105. This is not limited here.

[0051] This application also discloses a photovoltaic system, including one or more photovoltaic modules 300, and each photovoltaic module 300 may be provided with a photovoltaic AC component as disclosed in the above embodiments at its frame end. Therefore, this photovoltaic system has all the technical effects of the above-mentioned photovoltaic AC components, which will not be repeated here. By providing a micro-storage unit 200 in each photovoltaic module 300, the heat dissipation problem caused by centralized energy storage can be avoided. At the same time, the battery management system and communication can be integrated into the micro-inverter 101, so that it can be used as an outdoor mobile power source.

[0052] The terms "first" and "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units may include steps or units not listed, but rather not listed.

[0053] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A photovoltaic conversion module, characterized in that, include: A micro inverter (101) is provided with a first connection terminal (1011) and a second connection terminal (1012) at its output end. The first connection terminal (1011) is used to connect in parallel with an adjacent photovoltaic module (300), and the second connection terminal (1012) is used to connect with electrical equipment or a grid-connected system. A micro-storage unit (200) is connected to the micro-inverter (101).

2. The photovoltaic conversion module according to claim 1, characterized in that, There are two first connection terminals (1011), and the first connection terminal (1011) is either a male terminal or a female terminal.

3. The photovoltaic conversion module according to claim 1, characterized in that, The output end of the micro inverter (101) is also provided with a first DC connector (103), which is connected to the micro storage unit (200).

4. The photovoltaic conversion module according to claim 3, characterized in that, Both the micro inverter (101) and the micro storage unit (200) are rod-shaped structures, and the first DC connector (103) of the micro inverter (101) is plugged into the micro storage unit (200).

5. The photovoltaic conversion module according to claim 1, characterized in that, The second connection terminal (1012) includes a plug for connecting to electrical equipment or a grid-connected system.

6. The photovoltaic conversion module according to claim 1, characterized in that, The first connection terminal (1011) and the second connection terminal (1012) are respectively connected to the output terminal of the micro inverter (101) via AC cable (106).

7. A photovoltaic AC module, characterized in that, It includes a junction box (102) and a photovoltaic conversion module as described in any one of claims 1 to 6, wherein the junction box (102) is connected to the input terminal of the microinverter (101).

8. The photovoltaic AC module according to claim 7, characterized in that, The micro inverter (101) is provided with a second DC connector (105) at its input end, and the micro inverter (101) is connected to the junction box (102) through the second DC connector (105).

9. The photovoltaic AC module according to claim 8, characterized in that, The positive and negative terminals of the output terminal of the junction box (102) are connected to the second DC connector (105) via a DC cable (104), and / or the end of the DC cable (104) is provided with a plug terminal (1041) for plugging into the second DC connector (105).

10. A photovoltaic system, characterized in that, It includes one or more photovoltaic modules (300), and each of the photovoltaic modules (300) is provided with a photovoltaic AC module as described in any one of claims 7 to 9.

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