Photovoltaic power generation apparatus and photovoltaic power generation system

Abstract

Provided in the embodiments of the present disclosure are a photovoltaic power generation apparatus and a photovoltaic power generation system. The photovoltaic power generation apparatus comprises: a photovoltaic cell panel, which comprises a photovoltaic cell array, and a first surface and a second surface opposite each other; a plurality of wiring terminal components, which are mounted on the first surface of the photovoltaic cell panel independently of one another and are each electrically coupled to corresponding photovoltaic cells in the photovoltaic cell array; and an inverter device, which is mounted on the first surface of the photovoltaic cell panel and comprises a strip-shaped hollow housing and an inverter circuit located in the strip-shaped hollow housing, wherein the inverter circuit is electrically coupled to the plurality of wiring terminal components and converts into alternating-current power direct-current power from the photovoltaic cell array that is received via the plurality of wiring terminal components, and the strip-shaped hollow housing is arranged to extend in the direction in which the plurality of wiring terminal components are arranged and abut against the plurality of wiring terminal components.

Description

Photovoltaic power generation equipment and photovoltaic power generation systems Technical Field

[0001] The present disclosure relates to the technical field of photovoltaic power generation, and more particularly, to a photovoltaic power generation device and a photovoltaic power generation system including the photovoltaic power generation device. Background Art

[0002] Photovoltaic power generation utilizes the photovoltaic effect of photovoltaic cells to convert solar energy or light energy into electrical energy. It offers numerous advantages, including being clean, environmentally friendly, and renewable. To ensure that the electricity generated by photovoltaic cells meets the requirements of the grid or load, and to improve the efficiency of photovoltaic cells, power conversion equipment, such as microinverters, is typically required to convert the voltage or current generated by the photovoltaic cells into the required voltage and current.

[0003] Currently, power conversion equipment, such as microinverters, must be electrically connected to PV panels at the PV installation site. This installation and connection process is cumbersome and prone to errors. Furthermore, since the installation site is often inaccessible, such as on a rooftop, installation is challenging and prone to safety issues. Summary of the Invention

[0004] In order to at least partially solve the above and other possible problems, embodiments of the present disclosure provide a photovoltaic power generation device and a photovoltaic power generation system.

[0005] According to a first aspect of the present disclosure, a photovoltaic power generation device is provided, which includes: a photovoltaic panel, including an array of photovoltaic cells and a first surface and a second surface opposite to each other; a plurality of terminal components, which are independently mounted on the first surface of the photovoltaic panel and are each electrically coupled to a corresponding portion of the photovoltaic cells in the array of photovoltaic cells; and an inverter device, which is mounted on the first surface of the photovoltaic panel and includes a strip-shaped hollow shell and an inverter circuit located within the strip-shaped hollow shell, the inverter circuit being electrically coupled to the plurality of terminal components and being configured to convert DC power received from the array of photovoltaic cells via the plurality of terminal components into AC power, the strip-shaped hollow shell being arranged to extend along the arrangement direction of the plurality of terminal components and abut against the plurality of terminal components.

[0006] In some embodiments of the present disclosure, the photovoltaic cell array includes a first sub-array and a second sub-array separated from each other by a separation area in the photovoltaic panel, and a plurality of terminal components and an inverter device are arranged on a portion of the first surface corresponding to the separation area.

[0007] In some embodiments of the present disclosure, a width of a side surface of the strip-shaped hollow shell facing the first surface is smaller than a separation distance between the first sub-array and the second sub-array.

[0008] In some embodiments of the present disclosure, the strip-shaped hollow housing is detachably fixed to the plurality of terminal parts, and the inverter circuit is electrically coupled to the plurality of terminal parts in a pluggable manner.

[0009] In some embodiments of the present disclosure, the plurality of terminal components are fixed to the first surface of the photovoltaic panel in an adhesive manner.

[0010] In some embodiments of the present disclosure, each terminal assembly includes a housing, a terminal, and a waterproof component.

[0011] In some embodiments of the present disclosure, the photovoltaic cell array includes multiple groups of photovoltaic cells corresponding to multiple terminal components, the photovoltaic cells in each group of photovoltaic cells are connected to each other in series, parallel, or series-parallel and electrically coupled to the corresponding terminal components, and the inverter circuit includes a DC-AC converter and multiple DC-DC converters, the multiple DC-DC converters are respectively electrically coupled to the multiple terminal components on their input sides, and are connected in series, in parallel, or in series-parallel with each other on their output sides.

[0012] In some embodiments of the present disclosure, the inverter circuit includes a gallium nitride power device.

[0013] In some embodiments of the present disclosure, the first surface is the back side of the photovoltaic panel and the second surface is the front side of the photovoltaic panel.

[0014] In some embodiments of the present disclosure, the photovoltaic panel further includes a frame, and a height of the strip-shaped hollow shell protruding outward from the first surface does not exceed a height of the frame protruding outward from the first surface.

[0015] In some embodiments of the present disclosure, the strip-shaped hollow housing includes a heat dissipation mechanism, and the heat dissipation mechanism is located on a side surface of the strip-shaped hollow housing facing away from the first surface.

[0016] According to a second aspect of the present disclosure, there is provided a photovoltaic power generation system, comprising: at least one photovoltaic power generation device according to the first aspect.

[0017] This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to limit the scope of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure with reference to the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0019] FIG1 shows a schematic diagram of a photovoltaic power generation system and an AC power grid according to an embodiment of the present disclosure.

[0020] FIG2 shows a perspective view of a photovoltaic power generation device in a photovoltaic power generation system according to an embodiment of the present disclosure.

[0021] FIG3 shows a bottom view of a photovoltaic power generation device in a photovoltaic power generation system according to an embodiment of the present disclosure.

[0022] FIG4 shows a partial perspective view of a photovoltaic power generation device according to an embodiment of the present disclosure.

[0023] FIG5 shows a perspective view of an inverter device of a photovoltaic power generation equipment according to an embodiment of the present disclosure.

[0024] FIG6 shows a perspective view of a photovoltaic panel and a plurality of terminal components according to an embodiment of the present disclosure.

[0025] FIG7 shows a schematic block diagram of an inverter device according to an embodiment of the present disclosure.

[0026] FIG8 shows an exemplary circuit diagram of multiple DC-DC converters in an inverter device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0027] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. Those skilled in the art can derive alternative technical solutions from the following description without departing from the spirit and scope of protection of the present disclosure.

[0028] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to." The term "or" means "and / or" unless otherwise stated. The term "based on" means "based, at least in part, on." The terms "one example" and "one embodiment" mean "at least one example embodiment." Other explicit and implicit definitions may be included below.

[0029] Embodiments of the present disclosure provide an improved photovoltaic power generation device. In this improved solution, the housing of the inverter device is formed into a strip shape and extends and is arranged along multiple terminal components, so that the inverter device can be pre-installed on the photovoltaic panel and connected to the multiple terminal components. As a result, the assembly of the photovoltaic module and the inverter device can be completed in advance before shipment, avoiding the tedious and inconvenient on-site wiring and installation, reducing the workload of on-site photovoltaic module installation, and facilitating the transportation of the photovoltaic module and its ancillary equipment.

[0030] FIG1 shows a schematic diagram of a photovoltaic power generation system 10 and an AC power grid 20 according to an embodiment of the present disclosure. As shown in FIG1 , photovoltaic power generation system 10 includes one or more photovoltaic power generation devices, such as a first group of photovoltaic power generation devices 100-1, 100-2, 100-3, ..., 100-N-1, 100-N, and a second group of photovoltaic power generation devices 100-1', 100-2', 100-3', ..., 100-N-1', 100-N'. For example, the first group of photovoltaic power generation devices 100-1, 100-2, 100-3, ..., 100-N-1, 100-N are connected in series with one another and connected to the live line L, neutral line N, and ground line PE of the AC power grid 20, while the second group of photovoltaic power generation devices 100-1', 100-2', 100-3', ..., 100-N-1', 100-N' are connected in series with one another and output power to the live line L, neutral line N, and ground line PE of the AC power grid 20. The AC grid 20 may be, for example, a distribution grid, thereby receiving and transmitting the power output by the photovoltaic power generation system 10. However, it is understood that, in addition to the distribution grid, the photovoltaic power generation system 10 may also be coupled to other types of AC devices or loads, and the present disclosure is not limited thereto.

[0031] 2 and 3 show a perspective view and a bottom view of a photovoltaic power generation device 100 in a photovoltaic power generation system 10 according to an embodiment of the present disclosure. Photovoltaic power generation device 100 may be one of a first group of photovoltaic power generation devices 100-1, 100-2, 100-3, ..., 100-N-1, 100-N and a second group of photovoltaic power generation devices 100-1', 100-2', 100-3', ..., 100-N-1', 100-N'.

[0032] As shown in Figures 2 and 3, photovoltaic power generation device 100 includes a photovoltaic panel 110, which includes a photovoltaic cell array and a first surface F1 and a second surface F2 that oppose each other. As an example, the photovoltaic cell array is composed of a plurality of photovoltaic cells, and at least one of the first surface F1 and the second surface F2 of photovoltaic panel 110 can receive sunlight, thereby converting the solar energy into electrical energy by the photovoltaic cells in photovoltaic panel 110. In one example, photovoltaic panel 110 can be a double-glass photovoltaic module, encapsulated with high-transmittance double-layer glass, with the photovoltaic cells sandwiched between the two layers of glass. This allows both surfaces of photovoltaic panel 110 to receive solar energy. Furthermore, photovoltaic panel 110 may include other components or elements as needed, such as a frame or backsheet, encapsulating film, etc. In one example, the photovoltaic cells in photovoltaic panel 110 include crystalline silicon cells, i.e., a plurality of crystalline silicon cells form a photovoltaic cell array. In another example, the photovoltaic cells in photovoltaic panel 110 include a tandem cell composed of perovskite cells and crystalline silicon cells. In a tandem solar cell, a cell array formed by several crystalline silicon cells is placed within a photovoltaic panel 110, and a layer of perovskite cell film is applied to the crystalline silicon cell array. By stacking the perovskite cell sheet and the crystalline silicon cell array in a stacked fashion, both types of photovoltaic cells can be placed within the same photovoltaic module. This allows cells with different band gaps to be combined to achieve segmented utilization of the solar spectrum, resulting in more efficient light absorption and conversion, effectively improving power conversion efficiency, reducing energy loss, and not requiring additional floor space.

[0033] In some embodiments of the present disclosure, the photovoltaic cell array includes a first sub-array 111A and a second sub-array 111B separated from each other by a separation region 112 in the photovoltaic panel 110. Specifically, the photovoltaic cell array in the photovoltaic panel 110 can be divided into two parallel sub-arrays arranged in two opposing regions, which can be separated by the separation region 112. In other words, no photovoltaic cells are arranged in the separation region 112. By providing two parallel sub-arrays, the overall internal resistance of the photovoltaic cell can be effectively reduced, which helps improve heat dissipation of the cell and reduces the risk of hot spots.

[0034] In some embodiments of the present disclosure, a photovoltaic cell array includes multiple groups of photovoltaic cells 111-1, 111-2, and 111-3, wherein the photovoltaic cells in each group of photovoltaic cells are connected to each other in series, parallel, or series-parallel. As an example, the cells in the first and second columns of the first sub-array 111A and the cells in the first and second columns of the second sub-array 111B can form a first group of photovoltaic cells 111-1, wherein the cells in the first and second columns of the first sub-array 111A can be connected in series to form a cell string, and the cells in the first and second columns of the second sub-array 111B can be connected in series to form another cell string, and the two cell strings are further connected in parallel to connect to the downstream equipment. The second group of photovoltaic cells and the third group of photovoltaic cells can be formed in a similar manner. Specifically, the third and fourth columns of cells in the first sub-array 111A and the third and fourth columns of cells in the second sub-array 111B can constitute a second group of photovoltaic cells 111-2, wherein the third and fourth columns of cells in the first sub-array 111A can be connected in series to form a cell string, and the third and fourth columns of cells in the second sub-array 111B can be connected in series to form another cell string, and the two cell strings are further connected in parallel; the fifth and sixth columns of cells in the first sub-array 111A and the fifth and sixth columns of cells in the second sub-array 111B can constitute a third group of photovoltaic cells 111-3, wherein the fifth and sixth columns of cells in the first sub-array 111A can be connected in series to form a cell string, and the fifth and sixth columns of cells in the second sub-array 111B can be connected in series to form another cell string, and the two cell strings are further connected in parallel. It is understood that the number of groups, columns, and rows of photovoltaic cells shown in the figures is merely exemplary, and the photovoltaic panel 110 may have a greater or lesser number of groups, columns, and rows.

[0035] According to an embodiment of the present disclosure, the photovoltaic power generation device 100 further includes a plurality of terminal components 120-1, 120-2, and 120-3. These terminal components 120-1, 120-2, and 120-3 are independently mounted on the first surface F1 of the photovoltaic panel 110 and are each electrically coupled to a corresponding portion of photovoltaic cells in the photovoltaic cell array. Specifically, each terminal component is an independent component relative to the other terminal components and is used to provide an electrical interface for power output of a corresponding group or portion of photovoltaic cells. As an example, the terminal component 120-1 can be coupled to the first group of photovoltaic cells 111-1, that is, the cell string formed by the first and second columns of cells in the first sub-array 111A and the cell string formed by the first and second columns of cells in the second sub-array 111B are coupled in parallel to the terminals in the terminal component 120-1. Similarly, the terminal component 120-2 can be coupled to the second group of photovoltaic cells 111-2, that is, the cell string formed by the cells in the third column and the fourth column of the first sub-array 111A and the cell string formed by the cells in the third column and the fourth column of the second sub-array 111B are coupled in parallel to the terminal in the terminal component 120-2; the terminal component 120-3 can be coupled to the third group of photovoltaic cells 111-3, that is, the cell string formed by the cells in the fifth column and the sixth column of the first sub-array 111A and the cell string formed by the cells in the fifth column and the sixth column of the second sub-array 111B are coupled in parallel to the terminal in the terminal component 120-3.

[0036] According to an embodiment of the present disclosure, the photovoltaic power generation device 100 further includes an inverter device 130, which is mounted on the first surface F1 of the photovoltaic panel 110. The inverter device 130 includes a strip-shaped hollow shell 131 and an inverter circuit 132 located within the strip-shaped hollow shell 131 (see Figure 7). The inverter circuit 132 is electrically coupled to the plurality of terminal components 120-1, 120-2, and 120-3 and converts the DC power received from the photovoltaic cell array via the plurality of terminal components 120-1, 120-2, and 120-3 into AC power. The strip-shaped hollow shell 131 is arranged to extend along the arrangement direction of the plurality of terminal components 120-1, 120-2, and 120-3 and abut against the plurality of terminal components 120-1, 120-2, and 120-3.

[0037] Specifically, the inverter device 130 is mounted on the same surface as the plurality of terminal blocks 120-1, 120-2, and 120-3 and is coupled to the plurality of terminal blocks 120-1, 120-2, and 120-3, thereby converting the DC power generated by the photovoltaic cells in the photovoltaic cell array into AC power and outputting it to downstream equipment such as the AC grid 20. Because the inverter device 130 and its housing 131 are formed in a strip shape and extend along the arrangement direction of the plurality of terminal blocks 120-1, 120-2, and 120-3 so as to abut against the terminal blocks, the inverter device 130 can be quickly and conveniently pre-installed and coupled to the plurality of terminal blocks 120-1, 120-2, and 120-3, thereby forming a single unit with the photovoltaic panel 110 and the plurality of terminal blocks 120-1, 120-2, and 120-3. The inverter device 130 can then be transported and installed as a single unit, eliminating the need to transport these components separately and omitting additional on-site wiring and installation steps. In this way, the transportation and on-site installation of photovoltaic power generation equipment can be simplified, thereby avoiding problems such as cumbersome installation, wiring errors and personnel safety that may arise during on-site installation.

[0038] In some embodiments of the present disclosure, a plurality of terminal components 120-1, 120-2, 120-3 and an inverter device 130 are arranged on a portion of the first surface F1 corresponding to the separation area 112. Specifically, the terminal components 120-1, 120-2, 120-3 and the inverter device 130 are all non-transparent components and may therefore block light and affect the reception of light by the photovoltaic cell. The separation area 112 is the area between the two sub-arrays 111A and 111B of the photovoltaic cell and no photovoltaic cells are installed. By arranging the terminal components 120-1, 120-2, 120-3 and the inverter device 130 in the separation area 112, the terminal components and the inverter device can be integrated on the photovoltaic panel while avoiding their adverse effects on the reception of light energy by the photovoltaic cell, thereby not reducing the power generation efficiency of the photovoltaic power generation equipment.

[0039] In some embodiments of the present disclosure, the width W1 of the side of the strip-shaped hollow housing 131 facing the first surface F1 is less than the separation distance W2 between the first sub-array 111A and the second sub-array 111B. In this way, the inverter device 130 can be fully integrated and installed in the separation area 112 of the photovoltaic panel 110 without blocking the photovoltaic cells, thereby minimizing the impact of these auxiliary components on power generation efficiency.

[0040] In some embodiments of the present disclosure, the photovoltaic panel 110 further includes a frame 113, and the height of the strip-shaped hollow shell 131 protruding outward from the first surface F1 does not exceed the height of the frame 113 protruding outward from the first surface F1. As an example, the frame 113 is used to fix components such as photovoltaic cells and glass, and has a certain thickness, which is also the actual thickness of the photovoltaic panel 110. By ensuring that the height of the strip-shaped hollow shell 131 protruding outward does not exceed the height of the frame 113 protruding outward from the first surface F1, it is possible to ensure that the overall thickness of the photovoltaic power generation device 100 does not change due to the installation of the inverter device 130 and its shell 131. As a result, multiple photovoltaic power generation devices 100 can be stacked back to back during transportation, which facilitates the transportation of photovoltaic power generation devices pre-installed with inverter devices in a more compact and stable manner, thereby maximizing the convenience of loading, unloading and transportation of photovoltaic power generation equipment.

[0041] In some embodiments of the present disclosure, the strip-shaped hollow housing 131 includes a heat dissipation mechanism (not shown) located on the side of the strip-shaped hollow housing 131 facing away from the first surface F1. For example, the heat dissipation mechanism may be one or more heat dissipation conductors and / or one or more heat dissipation openings for conducting and releasing heat within the strip-shaped hollow housing 131 to the external environment. This facilitates improved heat dissipation of the inverter device 130 and effectively prevents the adverse effects of heat generated by the inverter device 130 on the photovoltaic cells.

[0042] In some embodiments of the present disclosure, the first surface F1 is the backside of the photovoltaic panel 110, while the second surface F2 is the frontside of the photovoltaic panel 110. Specifically, the backside of the photovoltaic panel 110 is the side opposite the frontside, and after the photovoltaic power generation device 100 is installed, the frontside of the photovoltaic panel 110 will face the sun. By placing the inverter device 130 and the multiple terminal components 120-1, 120-2, and 120-3 on the backside of the photovoltaic panel 110, these components can be prevented from affecting light reception, resulting in a more aesthetically pleasing and streamlined appearance for the photovoltaic power generation device.

[0043] Figure 4 shows a partial stereoscopic view of the photovoltaic power generation equipment 100 according to an embodiment of the present disclosure, Figure 5 shows a stereoscopic view of the inverter device 130 according to an embodiment of the present disclosure, and Figure 6 shows a stereoscopic view of the photovoltaic panel 110 and multiple terminal components 120-1, 120-2, and 120-3 according to an embodiment of the present disclosure.

[0044] In some embodiments of the present disclosure, the strip-shaped hollow housing 131 of the inverter device 130 is detachably fixed to the plurality of terminal blocks 120-1, 120-2, and 120-3, and the inverter circuit 132 is electrically coupled to the plurality of terminal blocks 120-1, 120-2, and 120-3 in a pluggable manner. For example, the strip-shaped hollow housing 131 may be provided with fixing posts 1311, 1312, and 1313, and the terminal blocks 120-1, 120-2, and 120-3 may be provided with fixing holes that cooperate with the fixing posts 1311, 1312, and 1313, thereby conveniently mechanically fixing the housing 131 to the terminal blocks. Furthermore, the inverter device 130 may be provided with electrical pluggable components or plug ports 1332, 1333, and 1334 that can cooperate with the terminal blocks in the terminal blocks 120-1, 120-2, and 120-3. For example, the electrical plug-in components or plug-in ports 1332, 1333, and 1334 can be either plugs or sockets. Thus, while the housing 131 is fixed to the terminal block, the electrical plug-in components or plug-in ports can be used for connection, thereby achieving electrical connection between the circuit inside the inverter device 130 and the terminal block and the photovoltaic cell. It is understood that the detachable fixation and pluggable electrical connection between the inverter device 130 and the multiple terminal blocks 120-1, 120-2, and 120-3 can also be achieved in other appropriate ways, such as by using snap connections, threaded connections, etc. In this way, the inverter device 130 can be easily installed on the photovoltaic panel 110, and in the event of a fault, the inverter device 130 can be easily replaced and repaired, thereby significantly reducing the difficulty and cost of installing and replacing the inverter device.

[0045] In some embodiments of the present disclosure, a plurality of terminal components 120-1, 120-2, and 120-3 are adhesively fixed to the first surface F1 of the photovoltaic panel 110. As an example, the terminal components 120-1, 120-2, and 120-3 can be attached to the glass layer of the photovoltaic panel 110 using an adhesive, thereby enabling the installation of the terminal components 120-1, 120-2, and 120-3 without damaging surface packaging components such as glass.

[0046] In some embodiments of the present disclosure, each of the terminal components 120-1, 120-2, and 120-3 includes a housing 121-1, 121-2, and 121-3, a terminal 122-1, 122-2, and 122-3, and a waterproof component. As an example, the terminal 122-1, 122-2, and 122-3 can be housed in the housing 121-1, 121-2, and 121-3, respectively, to prevent the terminal from being exposed to the external environment. The relatively sturdy housing 121-1, 121-2, and 121-3 also facilitates stable and reliable attachment of the terminal component to the photovoltaic panel 110 and to the housing 131 of the inverter device 130. In addition, waterproof components such as sealing strips or sealing films are provided in the housings 121-1, 121-2, and 121-3, which effectively prevent water in the external environment from entering the interior of the photovoltaic panel 110 through the terminal components, thereby protecting the internal photovoltaic cells from the influence of the external environment.

[0047] FIG7 shows a schematic block diagram of an inverter device 130 according to an embodiment of the present disclosure. As shown in FIG7 , in some embodiments of the present disclosure, the inverter device 130 includes a housing 131 and an inverter circuit 132. The inverter circuit 132 includes a DC-AC converter 1321 and a plurality of DC-DC converters 1322, 1323, and 1324. The plurality of DC-DC converters 1322, 1323, and 1324 are adapted to be electrically coupled to the plurality of terminal blocks 120-1, 120-2, and 120-3 at their input sides, and are connected in series with each other at their output sides. Furthermore, in addition to the serial connection of the plurality of DC-DC converters 1322, 1323, and 1324 shown in FIG7 , the plurality of DC-DC converters 1322, 1323, and 1324 may also be connected in parallel or in series-parallel connection at their output sides.

[0048] As an example, multiple DC-DC converters 1322, 1323, and 1324 can be coupled to plug ports 1332, 1333, and 1334 on housing 131, respectively, and are coupled to multiple terminal blocks 120-1, 120-2, and 120-3, respectively, via plug ports 1332, 1333, and 1334. Multiple DC-DC converters 1322, 1323, and 1324 are coupled to DC-AC converter 1321 on their output sides and are coupled to other photovoltaic power generation devices or AC grid 20 via ports 1341 and 1342. Thus, the DC-DC converters 1322, 1323, and 1324 respectively perform appropriate DC power conversion on the DC power generated by the first group of photovoltaic cells 111-1, the second group of photovoltaic cells 111-2, and the third group of photovoltaic cells 111-3, and perform maximum power point tracking (MPPT) operations so that the DC-DC converters adjust the output voltage and current of the corresponding group of photovoltaic cells to the maximum power point. Thus, independent MPPT operations can be performed on each group of photovoltaic cells, thereby achieving greater flexibility and higher power generation efficiency. The DC-AC converter 1321 then converts the DC power output by the multiple DC-DC converters 1322, 1323, and 1324 into AC power for external output. It will be understood that the number of DC-DC converters, plug-in ports, terminal blocks, and cell groups is merely illustrative, and more or fewer DC-DC converters, plug-in ports, terminal blocks, and cell groups can be provided as needed.

[0049] Due to the use of multiple DC-DC converters 1322, 1323, and 1324, it is no longer necessary to set up distribution boxes and bypass diodes for photovoltaic cells. In conventional solutions, photovoltaic modules need to be equipped with distribution boxes to lead the DC power generated by the photovoltaic modules to subsequent circuits such as inverters. The distribution box is usually equipped with parallel bypass diodes for each group of cells in multiple groups of cells. Under certain circumstances, the bypass diodes can bypass the corresponding group of cells in the photovoltaic module. For example, in the case where a group of cells is blocked or partially damaged, in order to prevent the group of cells from being damaged due to the hot spot effect, the bypass diodes connected in parallel with the group of cells can bypass the group of cells, thereby ensuring that the other cells can still work normally. However, this bypass diode will cause the bypassed group of cells to no longer output power as a whole, even if the group of cells is only partially blocked or partially damaged. In addition, the distribution box and its bypass diodes are relatively easy to damage and malfunction components in the photovoltaic system. Therefore, during the useful life of the photovoltaic system and its photovoltaic modules, the distribution box and its bypass diodes often need to be repaired and replaced. By providing multiple DC-DC converters in the inverter device 130, the generated power of each group of photovoltaic cells in the multiple groups of photovoltaic cells can be directly regulated and output. For example, when a group of photovoltaic cells is blocked, the corresponding DC-DC converter can regulate the voltage of the output of the group of photovoltaic cells and output it to the outside without bypassing it. As a result, it is no longer necessary to set up traditional bypass diodes and distribution boxes for photovoltaic modules. In this way, not only are the distribution boxes and their bypass diodes with a high failure rate removed, thereby improving the reliability of the system, but it also ensures that the blocked or partially damaged cell groups can still output a certain amount of power, thereby improving energy utilization efficiency.

[0050] Fig. 8 shows an exemplary circuit diagram of multiple DC-DC converters 1322, 1323, 1324 in the inverter device 130 according to an embodiment of the present disclosure. As shown in Fig. 8, the multiple DC-DC converters 1322, 1323, 1324 are DC boost converters. As an example, DC-DC converter 1322 includes an inductor L1-1, power switches Q1-1 and Q2-1, and capacitors C1-1 and C2-1, and is coupled to plug port 1332 on one side of capacitor C1-1. DC-DC converter 1323 includes an inductor L1-2, power switches Q1-2 and Q2-2, and capacitors C1-2 and C2-2, and is coupled to plug port 1333 on one side of capacitor C1-2. DC-DC converter 1324 includes an inductor L1-3, power switches Q1-3 and Q2-3, and capacitors C1-3 and C2-3, and is coupled to plug port 1334 on one side of capacitor C1-3. By controlling power switches Q1-1, Q1-2, and Q1-3 (e.g., in PWM control mode), boosting operation and MPPT operation can be performed on each group of battery cells coupled to terminal blocks 120-1, 120-2, and 120-3, respectively. Although the BOOST converter is used as an example to describe the multiple DC-DC converters 1322, 1323, and 1324, the multiple DC-DC converters 1322, 1323, and 1324 can also be implemented as other types of DC-DC conversion circuits, such as a DC step-down (BUCK) converter, according to actual needs.

[0051] Furthermore, when the photovoltaic panel 110 uses the aforementioned stacked photovoltaic cells, since the output voltage level of the perovskite cell is generally much higher than that of the crystalline silicon cell, the output of the crystalline silicon cell array can be coupled to multiple DC-DC converters 1322, 1323, and 1324 to increase the lower voltage level output by the crystalline silicon cell array to a voltage substantially close to that of the perovskite cell output, and the output of the perovskite cell can be directly coupled to the DC-AC converter 1321. Thus, the power output from the two photovoltaic cells can be combined into one output to the DC-AC converter 1321, thereby effectively outputting power to the grid or load.

[0052] In some embodiments of the present disclosure, the inverter circuit 132 includes gallium nitride power devices. For example, the power switching devices in the multiple DC-DC converters 1322, 1323, 1324 and the DC-AC converter 1321 can be gallium nitride power devices. Generally speaking, power switching devices occupy a large amount of space in the inverter device 130. Gallium nitride power devices have higher power density, smaller size, and greater high-temperature stability. By using gallium nitride power devices, the space occupied by the power switching devices can be reduced, thereby significantly reducing the volume of the inverter device 130 and enabling the use of a smaller housing 131. This further facilitates the pre-installation and integration of the inverter device 130 into the partition area 112 on the photovoltaic panel 110.

[0053] In the embodiments of the present disclosure, by forming the inverter device into a strip shape and installing it against multiple terminal components, the inverter device can be pre-installed and integrated on the photovoltaic panel, which facilitates the transportation of the photovoltaic equipment and reduces the workload and installation cost of on-site installation, and eliminates wiring errors and personnel safety issues that may be caused by on-site installation.

[0054] Through the teachings given in the above description and the associated drawings, many modifications and other embodiments of the present disclosure given here will be recognized by those skilled in the art of the present disclosure. Therefore, it is to be understood that the embodiments of the present disclosure are not limited to the specific embodiments disclosed, and modifications and other embodiments are intended to be included within the scope of the present disclosure. In addition, although the above description and the associated drawings have described the example embodiments in the context of certain example combinations of parts and / or functions, it should be appreciated that different combinations of parts and / or functions can be provided by alternative embodiments without departing from the scope of the present disclosure. In this regard, for example, other combinations of parts and / or functions that are different from those explicitly described above are also expected to be within the scope of the present disclosure. Although specific terms are used here, they are used only in a general and descriptive sense and are not intended to be limiting.

Claims

1. A photovoltaic power generation device (100), comprising: A photovoltaic cell panel (110) comprising a photovoltaic cell array (111A, 111B) and a first surface (F1) and a second surface (F2) facing each other; A plurality of terminal components (120-1, 120-2, 120-3) are independently mounted on the first surface (F1) of the photovoltaic panel (110) and are each electrically coupled to a corresponding portion of photovoltaic cells in the photovoltaic cell array (111A, 111B); and An inverter device (130) is mounted on the first surface (F1) of the photovoltaic cell panel (110) and comprises a strip-shaped hollow shell (131) and an inverter circuit (132) located within the strip-shaped hollow shell (131). The inverter circuit (132) is electrically coupled to the plurality of terminal components (120-1, 120-2, 120-3) and is configured to convert DC power received from the photovoltaic cell array (111A, 111B) via the plurality of terminal components (120-1, 120-2, 120-3) into AC power. The strip-shaped hollow shell (131) is arranged to extend along the arrangement direction of the plurality of terminal components (120-1, 120-2, 120-3) and abut against the plurality of terminal components (120-1, 120-2, 120-3).

2. The photovoltaic power generation device (100) according to claim 1, wherein the photovoltaic cell array (111A, 111B) includes a first sub-array (111A) and a second sub-array (111B) separated from each other by a separation area (112) in the photovoltaic panel (110), and the plurality of terminal components (120-1, 120-2, 120-3) and the inverter device (130) are arranged on a portion of the first surface (F1) corresponding to the separation area (112).

3. The photovoltaic power generation device (100) according to claim 2, wherein the width (W1) of the side of the strip-shaped hollow shell (131) facing the first surface (F1) is smaller than the separation distance (W2) between the first sub-array (111A) and the second sub-array (111B).

4. The photovoltaic power generation device (100) according to any one of claims 1 to 3, wherein the strip-shaped hollow shell (131) is fixed to the multiple terminal parts (120-1, 120-2, 120-3) in a detachable manner, and the inverter circuit (132) is electrically coupled to the multiple terminal parts (120-1, 120-2, 120-3) in a pluggable manner.

5. The photovoltaic power generation device (100) according to any one of claims 1 to 3, wherein the plurality of terminal components (120-1, 120-2, 120-3) are fixed to the first surface (F1) of the photovoltaic panel (110) in an adhesive manner.

6. The photovoltaic power generation device (100) according to claim 1, wherein each terminal block (120-1, 120-2, 120-3) comprises a housing (121-1, 121-2, 121-3), a terminal block (122-1, 122-2, 122-3), and a waterproof member.

7. The photovoltaic power generation device (100) according to claim 1, wherein the photovoltaic cell array (111A, 111B) comprises a plurality of groups of photovoltaic cells (111-1, 111-2, 111-3) corresponding to the plurality of terminal components (120-1, 120-2, 120-3), the photovoltaic cells in each group of photovoltaic cells (111-1, 111-2, 111-3) being connected to each other in series, in parallel, or in series-parallel and electrically coupled to the corresponding terminal components (120-1, 120-2, 120-3), and The inverter circuit (130) includes a DC-AC converter (1321) and a plurality of DC-DC converters (1322, 1323, 1324), wherein the plurality of DC-DC converters (1322, 1323, 1324) are electrically coupled to the plurality of terminal components (120-1, 120-2, 120-3) on their input sides, and are connected in series, in parallel, or in series and parallel on their output sides.

8. The photovoltaic power generation device (100) according to claim 1, wherein the inverter circuit (132) comprises a gallium nitride power device.

9. The photovoltaic power generation device (100) according to claim 1, wherein the first surface (F1) is the back surface of the photovoltaic panel (110), and the second surface (F2) is the front surface of the photovoltaic panel (110).

10. The photovoltaic power generation device (100) according to claim 1, wherein the photovoltaic panel (110) further includes a frame (113), and the height of the strip-shaped hollow shell (131) protruding outward from the first surface (F1) does not exceed the height of the frame (113) protruding outward from the first surface (F1).

11. The photovoltaic power generation device (100) according to claim 1, wherein the strip-shaped hollow shell (131) comprises a heat dissipation mechanism, and the heat dissipation mechanism is located on a side of the strip-shaped hollow shell (131) facing away from the first surface (F1).

12. A photovoltaic power generation system (10), comprising: At least one photovoltaic power generation device (100) according to any one of claims 1 to 11.

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