Lightning protection device, photovoltaic equipment and photovoltaic system

Abstract

The utility model provides a lightning protection device, photovoltaic equipment and a photovoltaic system, and relates to the technical field of electrical protection structures, the lightning protection device comprises a cabinet and a plurality of lightning protection devices, the plurality of lightning protection devices are installed in the cabinet and are all grounded through the cabinet, and the cabinet is connected with the photovoltaic equipment. Any lightning protection device is used for being correspondingly and electrically connected with any current transmission line accessed by an inverter of the photovoltaic equipment. According to the lightning protection device, the working stability of the lightning protection devices in the cabinet can be ensured by utilizing the cabinet, meanwhile, the loading and unloading convenience can be effectively improved, the application convenience of the lightning protection device is further ensured, meanwhile, the plurality of lightning protection devices in the cabinet are utilized, and the lightning protection devices are grounded through the cabinet, so that the reliability of the lightning protection device is improved. The surge current in a plurality of current transmission lines connected in parallel on the inverter can be guided, so that the requirement of the inverter on centralized conversion of the current in the plurality of current transmission lines can be met, the influence of lightning stroke on photovoltaic equipment can be reduced, and the working stability of the photovoltaic equipment is ensured.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electrical protection structures, and more particularly, to a lightning protection device, a photovoltaic device, and a photovoltaic system. Background Art

[0002] With the development of photovoltaic power generation technology, photovoltaic systems with photovoltaic modules as the core have been widely used. Photovoltaic modules convert solar energy into electrical energy and output it in the form of current. After the current is converted by the inverter of the photovoltaic system, it is input into the power grid for use by electrical devices. For the need to facilitate the photovoltaic panels of photovoltaic modules to receive sunlight, photovoltaic systems are generally laid in open areas and cover a large area, and are extremely vulnerable to lightning strikes. In order to avoid the adverse impact of lightning strikes on the working stability of photovoltaic systems, lightning protection structures such as lightning rods are generally installed in the installation areas of photovoltaic devices such as inverters.

[0003] However, the lightning protection structure is usually installed near the current transmission line between the photovoltaic module and the inverter. Generally, the inverter of the existing photovoltaic device is correspondingly connected to multiple current transmission lines to realize the centralized conversion of the current transmitted by multiple photovoltaic modules. This requires the design and installation of multiple lightning protection structures for the same inverter, resulting in a relatively high complexity of design and installation and poor application convenience. Summary of the Utility Model

[0004] The problem solved by the present disclosure is how to provide a lightning protection structure that can reduce the impact of lightning strikes on the working stability of photovoltaic devices and is convenient to apply.

[0005] To solve the above problems, the present disclosure provides a lightning protection device, a photovoltaic device, and a photovoltaic system.

[0006] In a first aspect, the present disclosure provides a lightning protection device, including a cabinet and a plurality of lightning arresters. The plurality of lightning arresters are installed in the cabinet and are all grounded through the cabinet. Any one of the lightning arresters is used to be electrically connected to any one of the current transmission lines accessed by the inverter of the photovoltaic device.

[0007] Optionally, the lightning protection device further includes a lightning protection board, which is installed in the cabinet, and the plurality of lightning arresters are installed on the lightning protection board.

[0008] Optionally, the lightning protection board is perpendicular to a first direction. There are a plurality of the lightning protection boards, and in a first plane, the projections of the plurality of lightning protection boards are spaced along the first direction, and the first direction is parallel to the first plane.

[0009] Optionally, on the second plane, the projections of the plurality of lightning protection plates are sequentially distributed in the second direction, and the projections of two adjacent lightning protection plates are spaced apart from each other or partially overlapped. The second plane is perpendicular to the first direction, and the second direction is perpendicular to the first plane.

[0010] Optionally, the lightning protection device further includes a terminal assembly, which is installed on a wall plate of the cabinet perpendicular to the second direction. The terminal assembly penetrates the wall plate and is electrically connected to the connection cable, and the terminal assembly is used for electrically connecting to the current transmission line.

[0011] Optionally, the wall plate is recessed along the second direction to form a mounting groove, and the terminal assembly penetrates the bottom wall of the mounting groove.

[0012] Optionally, the terminal assembly includes a positive terminal and a negative terminal. The positive terminal and the negative terminal are spaced apart along the first direction. A plurality of positive terminals are spaced apart along the third direction, and a plurality of negative terminals are spaced apart along the third direction. On the first plane, the projections of the positive terminals and the projections of the negative terminals are alternately arranged along the third direction. The third direction is perpendicular to both the first direction and the second direction.

[0013] Optionally, a grounding connector is provided on the cabinet, and the grounding connector is used for electrically connecting to the grounding end of the inverter;

[0014] The cabinet is a conductive structure. The lightning arrester is electrically connected to the grounding connector through the cabinet, or the lightning arrester is electrically connected to the grounding connector through a connection cable.

[0015] In a second aspect, the present disclosure provides a photovoltaic device, including an inverter and the lightning protection device as described above.

[0016] Optionally, an internal lightning protection component is provided inside the inverter. The internal lightning protection component is grounded and is electrically connected to the current transmission line accessing the inverter.

[0017] In a third aspect, the present disclosure provides a photovoltaic system, including the lightning protection device as described above, or including the photovoltaic device as described above.

[0018] Optionally, the photovoltaic system further includes a string photovoltaic unit, which is composed of a plurality of photovoltaic modules connected in series. There are a plurality of string photovoltaic units, and all the plurality of string photovoltaic units are electrically connected to the lightning protection device through current transmission lines.

[0019] The beneficial effects of the lightning protection device of the present disclosure are as follows: A cabinet is provided as the protection structure of the lightning protection device, and the lightning arrester is installed inside the cabinet. The cabinet can protect the lightning arrester, ensuring the working stability of the lightning arrester. At the same time, the transportation and installation of the lightning protection device can be achieved by moving the cabinet, improving the convenience of loading and unloading the lightning protection device. It can be directly transported to the installation site for installation after prefabrication at the manufacturing site, ensuring the application convenience of the lightning protection device. On this basis, multiple lightning arresters are provided. All the multiple lightning arresters can be grounded through the cabinet, and any one of the lightning arresters can be electrically connected to any current transmission line connected to the inverter of the photovoltaic device. With this setting, when a surge current is generated in the current transmission line due to lightning, before the surge current enters the inverter, it can be diverted into the lightning arrester. And because the lightning arrester is grounded, the surge current can be discharged into the ground through the lightning arrester, effectively reducing the impact of lightning strikes on the working stability of the photovoltaic device. At the same time, since multiple lightning arresters are provided, the surge current in multiple current transmission lines connected in parallel to the inverter can be diverted, which can not only meet the need for the inverter to centrally convert the current in multiple current transmission lines, but also reduce the impact of lightning strikes on the photovoltaic device and ensure the working stability of the photovoltaic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic connection diagram of the lightning protection device in the photovoltaic device in an embodiment of the present disclosure;

[0021] Figure 2 is a schematic connection diagram of the lightning arrester in the photovoltaic device in an embodiment of the present disclosure;

[0022] Figure 3 is a schematic structural diagram of the lightning protection device in an embodiment of the present disclosure;

[0023] Figure 4 is a schematic distribution diagram of the terminal assembly on the cabinet in an embodiment of the present disclosure;

[0024] Figure 5 is a schematic distribution diagram of the lightning protection board inside the cabinet in the first embodiment of the present disclosure;

[0025] Figure 6 is a schematic distribution diagram of the lightning protection board inside the cabinet in the second embodiment of the present disclosure;

[0026] Figure 7 is a schematic structural diagram of one perspective of the inside of the cabinet in the second embodiment of the present disclosure;

[0027] Figure 8 is a schematic structural diagram of another perspective of the inside of the cabinet in the second embodiment of the present disclosure;

[0028] Figure 9 is Figure 8 the sectional structure diagram of the perspective A shown in

[0029] Description of the reference numerals in the drawings:

[0030] 1. Cabinet; 11. Wall panel; 111. Installation groove; 12. Grounding connector; 13. Cabinet body; 14. Cover body; 2. Lightning arrester; 21. First module; 22. Second module; 23. Third module; 3. Inverter; 4. Lightning protection board; 41. Mounting plate; 42. First support column; 43. Support frame; 44. Second support column; 5. Terminal assembly; 51. Positive terminal; 52. Negative terminal; 6. Photovoltaic module; 7. Lock; 8. Hinge; 9. Die fixing wire rack. Detailed implementation manners

[0031] To make the above objects, features, and advantages of the present disclosure more apparent and understandable, the following describes in detail the specific embodiments of the present disclosure with reference to the accompanying drawings. Although some embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as limited to the embodiments described herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not used to limit the protection scope of the present disclosure.

[0032] In the accompanying drawings, the Z-axis represents the vertical direction, that is, the up and down position, and the positive direction of the Z-axis represents the upper side, and the negative direction of the Z-axis represents the lower side; the X-axis in the accompanying drawings represents the horizontal direction and is specified as the front and back position, and the positive direction of the X-axis represents the front side, and the negative direction of the X-axis represents the back side; the Y-axis in the accompanying drawings represents the left and right position, and the positive direction of the Y-axis represents the right side, and the negative direction of the Y-axis represents the left side. At the same time, it should be noted that the meanings represented by the foregoing Z-axis, Y-axis, and X-axis are only for facilitating the description of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation on the present disclosure.

[0033] The term "including" and its variants used herein are open-ended, that is, "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; the term "optionally" means "optional embodiment". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules, or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules, or units.

[0034] It should be noted that the modifications of "one" and "multiple" mentioned in this disclosure are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise clearly specified in the context, it should be understood as "one or more".

[0035] In the related art, during photovoltaic power generation, the photovoltaic module 6 in the photovoltaic system, i.e., the photovoltaic panel, converts solar energy into electrical energy and outputs it in the form of direct current. However, the current in the power grid of the photovoltaic system is transmitted in the form of alternating current. Therefore, an inverter 3 in the photovoltaic device is required to convert the direct current output by the photovoltaic module 6 into alternating current, and then a current transmission line is needed to connect the inverter 3 and the photovoltaic module 6. When installing photovoltaic devices in lightning-prone areas such as open areas and high-altitude areas, the spaced-apart photovoltaic modules 6 cover a large area, and multiple photovoltaic modules 6 are usually connected in series to form a string photovoltaic unit. Therefore, current transmission lines are required both between the photovoltaic module 6 and the inverter 3 and between two photovoltaic modules 6 in the same string photovoltaic unit to achieve connection. The entire current transmission line is long in size and large in distribution area, and is extremely susceptible to the lightning environment during current transmission, generating induced lightning, and then forming a surge current, which affects the working stability of the photovoltaic device, especially the stability of the working components inside the inverter 3. Therefore, a lightning arrester 2 capable of conducting surge current is usually provided inside the inverter 3. Among them, when a surge current is generated in the current transmission line, part of the surge current can be discharged to the ground through the lightning arrester 2 along the current transmission cable. However, there is also a part that cannot be completely discharged and forms a differential-mode surge current in the current transmission line, flowing into the circuit inside the inverter 3, thereby affecting the service life of devices with weak surge current resistance such as semiconductors and chips inside the inverter 3. Especially when the inverter 3 uses a multi-channel MPPT (Maximum Power Point Tracking) controller to access multiple current transmission lines corresponding to multiple string photovoltaic units, the formed differential-mode surge current has a greater impact, greatly reducing the working stability of the inverter 3. To address the problem of the inverter 3 being affected by lightning strikes, currently, lightning protection structures such as lightning rods are installed in the installation area of the photovoltaic device, but the design and installation of the lightning protection structure are relatively complex, and the application convenience is poor.

[0036] In view of the problems existing in the above-related technologies, this embodiment provides a lightning protection device, a photovoltaic device, and a photovoltaic system.

[0037] As Figure 1 shown, a lightning protection device provided in the first embodiment of the present disclosure includes a cabinet 1 and a plurality of lightning arresters 2. The plurality of lightning arresters 2 are installed in the cabinet 1 and are all grounded through the cabinet 1. Any one of the lightning arresters 2 is used to be electrically connected to any one of the current transmission lines accessed by the inverter 3 of the photovoltaic device.

[0038] Specifically, as Figure 2 shown, the lightning arrester 2 has a first module 21, a second module 22 and a third module 23. When connected to the current transmission line, the first module 21 is connected to the positive bus of the current transmission line, the second module 22 is connected to the negative bus of the current transmission line, and the third module 23 is grounded through the cabinet 1. Moreover, both the first module 21 and the second module 22 are electrically connected to the third module 23, that is, a diversion loop that can discharge the current into the ground is connected outside the current transmission line. For example, the structure of the lightning arrester 2 in this embodiment is the same as that of the lightning arrester 2 installed in the inverter 3. [[ID=--]]

[0039] In this embodiment, as Figure 1 and Figure 3 shown, the cabinet 1 is set as the protection structure of the lightning protection device. The lightning arrester 2 is installed in the cabinet 1, and the cabinet 1 can be used to protect the lightning arrester 2 to ensure the working stability of the lightning arrester 2. At the same time, the transportation and installation of the lightning protection device can be realized by moving the cabinet 1, improving the loading and unloading convenience of the lightning protection device. It can be directly transported to the installation site for installation after prefabrication at the manufacturing site, ensuring the application convenience of the lightning protection device; on this basis, multiple lightning arresters 2 are set. Multiple lightning arresters 2 can be grounded through the cabinet 1, and at the same time, any one of the lightning arresters 2 can be correspondingly electrically connected to any current transmission line connected to the inverter 3 of the photovoltaic device. With such a setting, when a surge current is generated due to lightning in the current transmission line, before the surge current enters the inverter 3, it can be diverted into the lightning arrester 2. Moreover, since the lightning arrester 2 is grounded, the surge current can be discharged into the ground through the lightning arrester 2, effectively reducing the impact of lightning strikes on the working stability of the photovoltaic device. At the same time, since multiple lightning arresters 2 are set, the surge current in multiple current transmission lines connected in parallel on the inverter 3 can be diverted, which can not only meet the need for the inverter 3 to centrally convert the current in multiple current transmission lines, but also reduce the impact of lightning strikes on the photovoltaic device and ensure the working stability of the photovoltaic device.

[0040] For example, the inverter 3 of the photovoltaic device is electrically connected to the photovoltaic modules 6 of the photovoltaic system through a current transmission line. Among them, there can be multiple photovoltaic modules 6, and multiple photovoltaic modules 6 are all electrically connected to the inverter 3 through the current transmission line. Multiple lightning arresters 2 in the lightning protection device are correspondingly electrically connected to the current transmission lines of multiple photovoltaic modules 6. Or, multiple photovoltaic modules 6 can be connected in series to form a string photovoltaic unit, and the string photovoltaic unit is electrically connected to the inverter 3 through the current transmission line. Among them, the formed string photovoltaic unit can be one or multiple, and one lightning arrester 2 in the lightning protection device is correspondingly electrically connected to the current transmission line of one string photovoltaic unit.

[0041] Exemplarily, while adding a lightning protection device outside the inverter 3 of the photovoltaic device, an internal lightning protection component can also be provided inside the inverter 3. The structure of the internal lightning protection component can be the same as or different from that of the lightning arrester 2. While the internal lightning protection component is grounded, it is also electrically connected to the current transmission line accessing the inverter 3, further enhancing the working stability of the photovoltaic device.

[0042] It should be noted that, as Figure 3 , Figure 4 and shown, the cabinet 1 includes a cover plate 14 and a cabinet body 13. Among them, the cabinet body 13 is a hollow structure with one end open, and the cover body 14 covers the opening of the cabinet body 13. The opposite sides of the cover body 14 are respectively connected to the cabinet body 13 through a lock 7 and a hinge 8.

[0043] As Figure 7 shown, the lightning protection device further includes a lightning protection plate 4. The lightning protection plate 4 is installed inside the cabinet 1, and a plurality of lightning arresters 2 are installed on the lightning protection plate 4.

[0044] Specifically, the lightning protection plate 4 can be a sheet metal mounting plate or a circuit board that cooperates with the lightning arrester 2 to form a current guiding circuit. When the connecting cable of the lightning arrester 2 extends to the inner wall of the cabinet 1, it can directly penetrate the inner wall of the cabinet 1 and extend to the outside of the cabinet 1 and then be connected to the current transmission line, or be electrically connected to the connecting structure on the cabinet 1. The connecting structure is connected to the current transmission line through the cable outside the cabinet 1. The lightning protection plate 4 is installed on the supporting structure inside the cabinet 1, so as to be spaced from the inner wall of the cabinet 1 to form a wiring space for the connecting cable of the lightning arrester 2 to extend. As Figure 5 shown, exemplarily, the supporting structure can be a mounting plate 41 installed inside the cabinet 1, or the first support column 42, the second support column 44 or the support frame 43, or a combination of at least two of the four. The supporting structure can be arranged on any inner wall of the cabinet 1. Preferably, the supporting structure is arranged on the bottom wall of the cabinet 1.

[0045] In this alternative embodiment, in order to ensure the working stability of the lightning arrester 2, a lightning protection plate 4 installed inside the cabinet 1 is also provided. Among them, a plurality of lightning arresters 2 are installed on the lightning protection plate 4. The lightning arrester 2 is supported by the lightning protection plate 4 stably installed inside the cabinet 1 to ensure the working stability of the lightning arrester 2. On this basis, the lightning protection plate 4 is also spaced from the inner wall of the cabinet 1 to form a wiring space. When the lightning arrester 2 accesses the current transmission line outside the cabinet 1 through the extended connecting cable, the wiring space can provide space for the connecting cable to extend inside the cabinet 1, ensuring the stability of the connecting cable inside the cabinet 1, thereby further ensuring the working stability of the lightning arrester 2. At the same time, the spaced arrangement of the lightning protection plate 4 and the inner wall of the cabinet 1 can also prevent electromagnetic induction from occurring between the conductive cabinet 1 and the lightning arrester 2 and / or the lightning protection plate 4.

[0046] As shown Figure 5 in Figure 5 , the lightning protection board 4 is perpendicular to the first direction. There are multiple lightning protection boards 4. On the first plane, the projections of the multiple lightning protection boards 4 are arranged at intervals along the first direction, and the first direction is parallel to the first plane.

[0047] Specifically, as shown Figure 5 in Figure 5 and Figure 3 Figure 3 , the first direction is the Z-axis direction, that is, the first direction is the vertical direction, which is also the height direction of the cabinet 1. And the first plane is parallel to the first direction. Since the first direction is perpendicular to the XY plane, the first plane is perpendicular to the XY plane. The first plane can be the XZ plane or the YZ plane. Preferably, the first plane is the XZ plane, that is, the first plane is the vertical plane relative to the placement surface of the cabinet 1; on the first plane, the projections of the multiple lightning protection boards 4 are arranged at intervals along the first direction. In this alternative embodiment, as shown Figure 5 in Figure 5 , it can mean that the multiple lightning protection boards 4 are arranged at intervals in sequence along the first direction, that is, the multiple lightning protection boards 4 are aligned vertically. In other embodiments of the present disclosure, it can also mean that the multiple lightning protection boards 4 are arranged at intervals in a staggered manner along the first direction.

[0048] In this alternative embodiment, by way of example, the support structure for mounting the lightning protection board 4 in the cabinet 1 is composed of a mounting plate 41, a first support column 42, a second support column 44, and a support frame 43. For example, as shown Figure 5 in Figure 5 and Figure 5 Figure 5 , the lightning protection device of this embodiment includes two lightning protection boards 4. The mounting plate 41 is mounted on the inner wall of the cabinet 1 through the first support column 42. One lightning protection board 4 is mounted on the mounting plate 41 through the second support column 44. The support frame 43 is also mounted on the mounting plate 41 and extends away from the mounting plate 41 along the first direction. The other lightning protection board 4 is mounted on the support frame 43 through the second support column 44, so that at least two lightning protection boards 4 have a certain height difference along the height direction of the cabinet 1 (that is, the first direction, the Z-axis direction). Of course, in other embodiments of the present disclosure, support blocks or the like can also be provided as the support structure. For example, two support structures are respectively fixed on the two opposite inner walls of the cabinet 1 that are parallel to the vertical direction. The two edges of the lightning protection board 4 can be mounted on the two support structures, so as to realize the suspended installation of the lightning protection board 4. And on either side of one installed lightning protection board 4 along the height direction of the cabinet 1, another lightning protection board 4 can be provided, and at least two lightning protection boards 4 can also have a height difference along the height direction of the cabinet 1.

[0049] In this alternative embodiment, as shown Figure 6As shown in the figure, the lightning protection board 4 is set perpendicular to the first direction. At the same time, a plurality of lightning protection boards 4 are provided, and the projections of the plurality of lightning protection boards 4 on the first plane parallel to the first direction are arranged at intervals along the first direction. That is, in the first direction, there is an interval between two adjacent lightning protection boards 4. Thus, a space for accommodating the lightning arrester 2 can be formed between the plate surface of any lightning protection board 4 facing another lightning protection board 4 and the other lightning protection board 4. A plurality of lightning arresters 2 can be arranged and installed on the plate surface of the lightning protection board 4, which not only ensures the stable installation of the lightning arrester 2 on the lightning protection board 4, but also, when the number of lightning arresters 2 installed on the lightning protection board 4 remains unchanged, the space of the cabinet 1 along the first direction can be utilized to increase the number of lightning arresters 2 that can be installed in the cabinet 1 by increasing the number of lightning protection boards 4 distributed along the first direction in the cabinet 1, effectively increasing the maximum value of the number of current transmission lines that the lightning protection device can access, thereby expanding the applicable range of the lightning protection device, and at the same time effectively improving the space utilization rate in the cabinet 1, which is conducive to the miniaturization and integration design of the lightning protection device.

[0050] As Figure 5 shown, compared with the first embodiment, in the second embodiment of the present disclosure, on the second plane, the projections of the plurality of lightning protection boards 4 are arranged in sequence along the second direction, and the projections of two adjacent lightning protection boards 4 are spaced apart from each other or partially overlapped. The second plane is perpendicular to the first direction, and the second direction is perpendicular to the first plane.

[0051] Specifically, as Figure 6 shown, the first plane is perpendicular to the XY plane, and the second direction is perpendicular to the first plane. Therefore, the second direction is parallel to the XY plane. The second direction can be the X-axis direction or the Y-axis direction, that is, the second direction is the horizontal direction. Preferably, the second direction is the X-axis direction. Since the second plane is perpendicular to the first direction, and the first direction is the Z-axis direction, the second plane is the XY plane, that is, the second plane is the horizontal plane. On the second plane, the projections of the plurality of lightning protection boards 4 are arranged in sequence along the second direction, and the projections of two adjacent lightning protection boards 4 are spaced apart from each other or partially overlapped, which means that on the basis of the spaced distribution of the plurality of lightning protection boards 4 along the first direction, two adjacent lightning protection boards 4 along the first direction are offset or spaced apart in the second direction. By way of example, the support structure for installing the lightning protection board 4 in the cabinet 1 is composed of a mounting plate 41, a first support column 42, a second support column 44, and a support frame 43. Among them, the mounting plate 41 is installed on the inner wall of the cabinet 1 through the first support column 42. A lightning protection board 4 is installed on the mounting plate 41 through the second support column 44. The support frame 43 is also installed on the mounting plate 41 and is arranged in sequence with the lightning protection board 4 along the second direction. The support frame 43 extends away from the mounting plate 41 along the first direction. Another lightning protection board 4 is installed on the support frame 43 through the second support column 44, forming a staggered arrangement of at least two lightning protection boards 4.

[0052] In this embodiment, as Figure 6As shown in the figure, on the basis of arranging multiple lightning protection boards 4 at intervals in the first direction, by staggering two adjacent lightning protection boards 4 in the first direction in the second direction, such an arrangement can effectively utilize the space of the cabinet 1 in the second direction, while ensuring the use stability of the lightning protection device, improving the space utilization rate inside the cabinet 1, and facilitating the miniaturization and integration design of the lightning protection device. At the same time, since two adjacent lightning protection boards 4 in the first direction are displaced from each other in the second direction, the accommodation space on one side of each lightning protection board 4 in the first direction becomes larger. This enlarged accommodation space can be used to effectively enhance the heat dissipation effect of the lightning arrester 2 on the lightning protection board 4, and also to arrange the connection cables of the lightning arrester 2, improving the convenience of arranging the connection cables inside the cabinet 1.

[0053] Exemplarily, as Figure 6 shown, two lightning protection boards 4 are arranged inside the cabinet 1, and there is a certain height difference between the two lightning protection boards 4 along the height direction of the cabinet 1 (i.e., the first direction, Z-axis direction). At the same time, the two lightning protection boards 4 are arranged at intervals in the horizontal direction (i.e., the second direction, X-axis direction). In this way, a staggered arrangement of the two lightning protection boards 4 with different heights is formed. Among them, the accommodation space B (the part circled by the dotted line in the figure) above the lower lightning protection board 4 becomes larger, and the accommodation space C (the part circled by the dotted line in the figure) below the higher lightning protection board 4 becomes larger. The heat generated by the lightning arrester 2 on the lightning protection board 4 during operation can be dissipated through the accommodation space B and the accommodation space C. The enlargement of the accommodation space B and the accommodation space C can effectively increase the heat dissipation effect. At the same time, the connection cables of the lightning arrester 2 on the lower lightning protection board 4 can be arranged in the space C, and the connection cables of the lightning arrester 2 on the higher lightning protection board 4 can be arranged in the space B.

[0054] As Figure 6 、 Figure 3 and Figure 7 shown, it further includes a terminal component 5. The terminal component 5 is installed on the wall panel 11 of the cabinet 1 perpendicular to the second direction. The terminal component 5 penetrates the wall panel 11 and is electrically connected to the connection cable, and the terminal component 5 is used to be electrically connected to the current transmission line.

[0055] Specifically, as Figure 8 and Figure 7 shown, multiple lightning arresters 2 on the lightning protection board 4 are arranged in a direction perpendicular to the second direction. A die-fixed wire rack 9 is arranged on the lightning protection board 4, and the connection cables of the lightning arrester 2 can be fixed through the die-fixed wire rack 9.

[0056] In this alternative embodiment, as Figure 8As shown, in order to ensure the convenience of connecting and disconnecting the connecting cable between the current transmission line and the lightning arrester 2, a terminal component 5 is also installed on the wall panel 11 of the cabinet 1 perpendicular to the second direction. Among them, the terminal component 5 penetrates the wall panel 11 and is electrically connected to the connecting cable, and the terminal component 5 can also be electrically connected to the current transmission line. Therefore, when connecting and disconnecting the connecting cable between the current transmission line and the lightning arrester 2, only the disconnection and connection between the terminal component 5 and the current transmission line need to be performed, effectively improving the convenience of connecting and disconnecting the connecting cable between the current transmission line and the lightning arrester 2; on this basis, as Figures 7 to 9 shown, the terminal component 5 is installed on the wall panel 11 on one side of the cabinet 1 along the second direction. A plurality of lightning protection plates 4 located inside the cabinet 1 are arranged along the second direction with the terminal component 5, and the plurality of lightning protection plates 4 are arranged at intervals along the first direction inside the cabinet 1. The first direction is perpendicular to the second direction. Therefore, there will be no obstruction between the plurality of lightning protection plates 4 in the second direction. The connecting cable of the lightning arrester 2 on any lightning protection plate 4 can directly extend along the second direction to the terminal component 5 for connection, effectively improving the convenience of arranging the connecting cable. At the same time, since the plurality of lightning protection plates 4 are staggered with each other along the second direction, the accommodation space between the other lightning protection plates 4 and the terminal component 5 in the cabinet 1 except the lightning protection plate 4 closest to the terminal component 5 along the second direction can be increased. Furthermore, the increased accommodation space is used to arrange the connecting cable, making the arrangement of the connecting cable more convenient.

[0057] Exemplarily, as Figure 9 shown, two lightning protection plates 4 are arranged inside the cabinet 1. The two lightning protection plates 4 have a certain height difference along the height direction of the cabinet 1 (i.e., the first direction, Z-axis direction). The terminal component 5 is located on one side of the lightning protection plate 4 along the horizontal direction (i.e., the second direction, X-axis direction). The connecting cable of the lightning arrester 2 on the lightning protection plate 4 can directly extend along the horizontal direction to the terminal component 5 for connection. At the same time, the two lightning protection plates 4 are staggered along the horizontal direction. In this way, a staggered arrangement of the two lightning protection plates 4 with different heights is formed. The higher lightning protection plate 4 is relatively closer to the terminal component 5 along the horizontal direction, and the lower lightning protection plate 4 is relatively farther from the terminal component 5 along the horizontal direction. Among them, the accommodation space D (the part circled by the dotted line in the figure) below the higher lightning protection plate 4 becomes larger due to the staggered arrangement with the lower lightning protection plate 4, and the lower lightning protection plate 4, the accommodation space D, and the terminal component 5 are arranged in sequence along the horizontal direction. The connecting cable of the lightning arrester 2 on the lower lightning protection plate 4 can be arranged in the space D and can also directly pass through the space D to be connected to the terminal component 5. Of course, as Figure 9As shown, the accommodation space E (the part circled by the dotted line in the figure) above the lower lightning protection board 4 becomes larger due to the offset arrangement from the higher lightning protection board 4. At this time, the connection cable of the lightning arrester 2 on the higher lightning protection board 4 can first extend into the accommodation space E for bending and storage, and then extend from the accommodation space E towards the terminal assembly 5, so as to store the connection cable by using the accommodation space E, avoid the accumulation caused by all the connection cables being placed between the higher lightning protection board 4 and the terminal assembly 5, and effectively improve the arrangement stability of the connection cable.

[0058] As Figure 9 and Figure 2 shown, the wall panel 11 is recessed along the second direction to form an installation groove 111, and the terminal assembly 5 penetrates the bottom wall of the installation groove 111.

[0059] Specifically, as Figure 8 and Figure 2 shown, the cross-sectional shape of the inner cavity of the installation groove 111 can be circular or polygonal; the formation of the installation groove 111 can be that the wall panel 11 is recessed under the pressure along the second direction, or a through hole is provided on the wall panel 11, and the edge of the through hole is connected with a concave part that can cover the through hole to form it.

[0060] In this alternative embodiment, an installation groove 111 is provided on the wall panel 11, the opening of the installation groove 111 is arranged along the second direction, and the terminal assembly 5 can be installed by penetrating the bottom wall of the installation groove 111. At this time, since the bottom wall of the installation groove 111 extends into the interior of the cabinet 1 relative to the wall panel 11, at least a part of the terminal assembly 5 can be located inside the installation groove 111, and then the corresponding connection part of the terminal assembly 5 and the cable outside the cabinet 1 is located inside the installation groove 111. In this way, when water falls above the cabinet 1, the terminal assembly 5 can be protected by the side wall of the installation groove 111, avoiding water from seeping into the electrical connection part of the terminal assembly 5 and ensuring the use stability of the lightning protection device.

[0061] As Figure 8 and Figure 2 shown, the terminal assembly 5 includes a positive terminal 51 and a negative terminal 52. The positive terminal 51 and the negative terminal 52 are arranged at intervals along the first direction. A plurality of positive terminals 51 are arranged at intervals along the third direction, and a plurality of negative terminals 52 are arranged at intervals along the third direction. In the first plane, the projections of the positive terminal 51 and the negative terminal 52 are alternately arranged along the third direction, and the third direction is perpendicular to both the first direction and the second direction.

[0062] Specifically, as Figure 3 and Figure 2 shown, the first direction is the Z-axis direction, the second direction is the X-axis direction, and the third direction is perpendicular to both the first direction and the second direction. Therefore, the third direction is the Y-axis direction.

[0063] In this alternative embodiment, asFigure 3 and Figure 2 As shown in Figure 2 , a positive terminal 51 and a negative terminal 52 are provided to form a terminal assembly 5. Among them, the positive terminal 51 and the negative terminal 52 are arranged at intervals in the first direction. With such an arrangement, the positive terminal 51 and the negative terminal 52 can be isolated from each other, preventing the cable connected to the negative terminal 52 from being interfered by the positive terminal 51 or the cable connected to the positive terminal 51 from being interfered by the negative terminal 52, which facilitates the positive terminal 51 and the negative terminal 52 to be respectively connected to the positive bus bar and the negative bus bar of the current transmission line. On this basis, multiple positive terminals 51 are arranged at intervals in the third direction, and multiple negative terminals 52 are also arranged at intervals in the third direction. At the same time, on the first plane, the projections of the positive terminals 51 and the negative terminals 52 are alternately arranged in the third direction. With such an arrangement, not only can the space of the cabinet 1 in the third direction be utilized to arrange multiple positive terminals 51 and negative terminals 52, so as to realize the corresponding connection between multiple lightning arresters 2 in the cabinet 1 and the current transmission line outside the cabinet 1, but also the staggered arrangement of the positive terminals 51 and the negative terminals 52 in the third direction within the same terminal assembly 5 can further avoid interference during cable connection, further ensuring the convenience and stability of the lightning protection device for connecting to the current transmission line.

[0064] As Figure 3 and Figure 3 shown in Figure 3 and Figure 3 , a grounding connector 12 is provided on the cabinet 1, and the grounding connector 12 is used for electrically connecting to the grounding end of the inverter 3; the cabinet 1 is a conductive structure, and the lightning arrester 2 is electrically connected to the grounding connector 12 through the cabinet 1, or the lightning arrester 2 is electrically connected to the grounding connector 12 through a connecting cable.

[0065] Specifically, as Figure 7 and Figure 3 shown in Figure 7 and Figure 3 , the grounding connector 12 can be a metal connector integrally formed with the cabinet 1, or a connection terminal inserted into the interior of the cabinet 1; the cabinet 1 is made of stainless steel or aluminum alloy.

[0066] In this alternative embodiment, a grounding connector 12 is provided on the cabinet 1, and the grounding connector 12 can be electrically connected to the grounding end of the inverter 3. With such an arrangement, the current introduced into the grounding connector 12 can be discharged into the ground through the grounding end of the inverter 3. On this basis, the cabinet 1 is set as a conductive structure, and the lightning arrester 2 is electrically connected to the grounding connector 12 through the cabinet 1, that is, after the lightning arrester 2 introduces the surge current of the current transmission line, it can first introduce the current into the cabinet 1, and then introduce the current into the grounding connector 12 through the cabinet 1, so that the surge current is discharged into the ground to achieve the lightning protection effect.

[0067] In other embodiments of the present disclosure, the difference between this embodiment and the second embodiment is that the lightning arrester 2 is electrically connected to the grounding connector 12 through a connecting cable. With this arrangement, there is no need to carry the current through the cabinet 1, and the connecting cable is directly used to allow the surge current to be discharged into the ground through the grounding connector 12, thereby achieving the same lightning protection effect.

[0068] A photovoltaic device provided by an embodiment of the present disclosure includes an inverter 3 and the above-mentioned lightning protection device.

[0069] The beneficial effects of the photovoltaic device of this embodiment relative to the prior art are the same as those of the above-mentioned lightning protection device, and will not be described in detail here.

[0070] The photovoltaic device in this embodiment also includes an internal lightning protection component inside the inverter 3. The internal lightning protection component is grounded and electrically connected to the current transmission line connected to the inverter 3, so that a portion of the surge current flowing into the inverter 3 on the current transmission line can be discharged to the ground, thereby improving the operating stability of the photovoltaic device.

[0071] An embodiment of the present disclosure provides a photovoltaic system, including the above-mentioned lightning protection device, or including the above-mentioned photovoltaic equipment.

[0072] The beneficial effects of the photovoltaic system of this embodiment relative to the prior art are the same as those of the above-mentioned lightning protection device or photovoltaic equipment, and will not be described in detail here.

[0073] like Figure 7 Figure 1 As shown, the photovoltaic system of this embodiment also includes a photovoltaic module 6, and multiple photovoltaic modules 6 can be connected in series to form a string photovoltaic unit. The multiple string photovoltaic units can be connected to the inverter 3 one-to-one through the current transmission line, and the lightning protection device can be electrically connected to the current transmission line. Among them, the lightning protection device can be one, and the multiple lightning arresters 2 in the lightning protection device are electrically connected to the current transmission line one-to-one. In other embodiments of the present disclosure, there can also be multiple lightning protection devices, and all lightning arresters 2 of the multiple lightning protection devices are electrically connected to the current transmission line one-to-one.

[0074] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present disclosure.

Claims

1. A lightning protection device, characterized in that, It includes a cabinet (1) and lightning arresters (2). There are multiple lightning arresters (2), and the multiple lightning arresters (2) are installed in the cabinet (1) and are all grounded through the cabinet (1). Any one of the lightning arresters (2) is used for corresponding electrical connection with any one of the current transmission lines connected to the inverter (3) of the photovoltaic device.

2. The lightning protection device according to claim 1, characterized in that, It further includes a lightning protection board (4). The lightning protection board (4) is installed in the cabinet (1), and the multiple lightning arresters (2) are installed on the lightning protection board (4).

3. The lightning protection device according to claim 2, wherein, The lightning protection board (4) is perpendicular to the first direction. There are multiple lightning protection boards (4). In the first plane, the projections of the multiple lightning protection boards (4) are arranged at intervals along the first direction, and the first direction is parallel to the first plane.

4. The lightning protection device according to claim 3, characterized in that, In the second plane, the projections of the multiple lightning protection boards (4) are distributed in sequence along the second direction, and the projections of adjacent two lightning protection boards (4) are spaced apart from each other or partially overlapped. The second plane is perpendicular to the first direction, and the second direction is perpendicular to the first plane.

5. The lightning protection device according to claim 4, wherein It further includes a terminal assembly (5). The terminal assembly (5) is installed on a wall panel (11) of the cabinet (1) that is perpendicular to the second direction. The terminal assembly (5) penetrates through the wall panel (11) and is electrically connected to the connecting cable. The terminal assembly (5) is used for electrical connection with the current transmission line.

6. The lightning protection device according to claim 5, characterized in that, The wall panel (11) is recessed along the second direction to form an installation groove (111), and the terminal assembly (5) penetrates through the bottom wall of the installation groove (111).

7. The lightning protection device according to claim 6, characterized in that, The terminal assembly (5) includes a positive terminal (51) and a negative terminal (52). The positive terminal (51) and the negative terminal (52) are arranged at intervals along the first direction. The multiple positive terminals (51) are arranged at intervals along the third direction, and the multiple negative terminals (52) are arranged at intervals along the third direction. In the first plane, the projections of the positive terminal (51) and the negative terminal (52) are alternately arranged along the third direction, and the third direction is perpendicular to both the first direction and the second direction.

8. The lightning protection device according to any one of claims 1 to 7, characterized in that, A grounding connector (12) is provided on the cabinet (1), and the grounding connector (12) is used for electrical connection with the grounding end of the inverter (3); The cabinet (1) is a conductive structure. The lightning arrester (2) is electrically connected to the grounding connector (12) through the cabinet (1), or the lightning arrester (2) is electrically connected to the grounding connector (12) through a connecting cable.

9. A photovoltaic device, characterized in that, It includes an inverter (3) and the lightning protection device according to any one of claims 1 to 8.

10. The photovoltaic device according to claim 9, characterized in that, An internal lightning protection component is provided in the inverter (3). The internal lightning protection component is grounded and is electrically connected to the current transmission line connected to the inverter (3).

11. A photovoltaic system, characterized in that, It includes the lightning protection device according to any one of claims 1 to 8, or it includes the photovoltaic device according to claim 9 or 10.

12. The photovoltaic system according to claim 11, characterized in that, It further includes a string photovoltaic unit. The string photovoltaic unit is composed of multiple photovoltaic modules (6) connected in series. There are multiple string photovoltaic units, and the multiple string photovoltaic units are all electrically connected to the lightning protection device through current transmission lines.

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