Grid-connected machine

Abstract

The utility model provides a grid-connected machine, which is used for being electrically connected with a photovoltaic panel, and comprises a case, a tray assembly, an internal heat dissipation module, an external heat dissipation module and a snow removal module, the tray assembly divides the space in the case into a first accommodating cavity and a second accommodating cavity; the internal radiator is mounted on the case and located in the second accommodating cavity; the external radiator is mounted on the case and located on the outer side of the case; the snow removal module is installed on the case and used for controlling heating of the photovoltaic panel so as to remove accumulated snow on the photovoltaic panel. According to the grid-connected machine, through the arrangement of a dual heat dissipation structure of the internal heat dissipation module and the external heat dissipation module, the heat dissipation efficiency of the grid-connected machine is improved; the space in the case is reasonably divided into the first containing cavity and the second containing cavity by arranging the tray assembly, classified installation of different parts is facilitated, and accumulated snow on the photovoltaic panel is effectively removed by arranging the snow removal module and controlling heating of the photovoltaic panel, so that the power generation efficiency of the photovoltaic panel is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of inverters, and more particularly relates to a grid-connected machine. BACKGROUND

[0002] At present, the grid-connected machine has been widely applied in the technical field of inverters. However, the existing grid-connected machine has some obvious defects.

[0003] Firstly, the thermodynamic design is unreasonable, which causes excessive heat or excessive concentration of the grid-connected machine in the working process, which not only affects the stability of the machine, but also may cause the machine size to be too large, which is not conducive to the installation and transportation of the equipment.

[0004] Secondly, the overall layout is unreasonable, which causes the customer to need to go through cumbersome steps when wiring, and the subsequent maintenance work is also relatively difficult. These problems limit the use effect of the existing grid-connected machine and bring many inconveniences to the actual application.

[0005] Finally, the compatible function types are not complete, and the snow removal function is lacking (the snow cover on the solar panel in winter will greatly reduce the power generation efficiency).

[0006] Therefore, it is necessary to improve the existing grid-connected machine to solve these technical problems. CONTENT OF THE INVENTION

[0007] The purpose of the embodiment of the application is to provide a grid-connected machine to solve the technical problems of unreasonable thermodynamic design and overall layout of the prior art and lack of snow removal function.

[0008] To achieve the above purpose, the technical scheme adopted by the application is to provide a grid-connected machine for electrically connecting a photovoltaic panel, the grid-connected machine comprising a machine case, a tray assembly, an internal heat dissipation module, an external heat dissipation module and a snow removal module; the tray assembly divides the space in the machine case into a first accommodating cavity and a second accommodating cavity; the internal heat dissipation module is installed on the machine case and located in the second accommodating cavity; the external heat dissipation module is installed on the machine case and located on the outside of the machine case; the snow removal module is installed on the machine case, and the snow removal module is used to control the photovoltaic panel to heat to remove the snow on the photovoltaic panel.

[0009] Optionally, the internal heat dissipation module comprises at least two internal fans, at least one internal fan is installed on the first side of the machine case, at least one internal fan is installed on the second side of the machine case, and the first side and the second side are two opposite sides of the machine case.

[0010] Optionally, the external heat dissipation module comprises an external fan group and a heat sink, the heat sink is mounted on the outer side of the cabinet, the external fan group is arranged close to the heat sink, and the external heat dissipation fan group is in sliding connection with the cabinet.

[0011] Optionally, the snow removal module comprises a snow removal capacitor plate, a snow removal power plate and a snow removal inductor which are electrically connected with each other, the snow removal capacitor plate and the snow removal power plate are mounted on the tray assembly and located in the first containing cavity, and the snow removal inductor is mounted on the outer side of the cabinet.

[0012] Optionally, the grid-connected machine further comprises a junction box, the junction box is arranged on the outer side of the cabinet, and the junction box is in sealed connection with the cabinet.

[0013] Optionally, the grid-connected machine further comprises a face cover, the face cover covers the opening of the cabinet and is in sealed connection with the cabinet.

[0014] Optionally, the grid-connected machine further comprises a control module, and the control module is electrically connected with the snow removal module.

[0015] Optionally, the control module comprises an AFCI function plate, and the AFCI function plate is arranged in the second containing cavity.

[0016] Optionally, the control module further comprises a PID module plate, a power plate and a capacitor plate which are electrically connected with each other, the power plate is arranged in the second containing cavity, and the PID module plate and the capacitor plate are arranged close to the power plate.

[0017] Optionally, the grid-connected machine further comprises a plurality of terminals, the terminals are mounted on the cabinet and electrically connected with the control module.

[0018] The grid-connected machine provided in the application has the following beneficial effects:

[0019] (1) Compared with the prior art, the grid-connected machine provided in the application optimizes the thermodynamic design by arranging the double heat dissipation structure of the internal heat dissipation module and the external heat dissipation module, effectively solves the problem of excessive heat or excessive concentration of the grid-connected machine in the working process, thereby improving the heat dissipation efficiency of the grid-connected machine and ensuring the stable operation of the grid-connected machine.

[0020] (2) Compared with the prior art, the grid-connected machine provided in the application rationally divides the space in the cabinet into the first containing cavity and the second containing cavity by arranging the tray assembly, which facilitates the classified installation of different components, optimizes the internal space layout of the cabinet, and makes the customer wiring steps more simple and the maintenance more convenient.

[0021] (3) Compared with the prior art, the grid-connected machine has the snow removal module, so that the working ability of the grid-connected machine under bad weather conditions is effectively improved, the snow on the photovoltaic panel is effectively removed by controlling the photovoltaic panel heating, and the power generation efficiency of the photovoltaic panel is improved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0023] Figure 1 An exploded structural schematic view of the grid-connected machine provided by the embodiments of the present application is shown in the figure.

[0024] Figure 2 A top view structural schematic view of the grid-connected machine (without the face cover) provided by the embodiments of the present application is shown in the figure.

[0025] Figure 3 A three-dimensional structural schematic view of the grid-connected machine (without the face cover) provided by the embodiments of the present application is shown in the figure.

[0026] Figure 4 An exploded structural schematic view of the control module in the grid-connected machine provided by the embodiments of the present application is shown in the figure.

[0027] In the figure, various reference signs are as follows:

[0028] 1 - machine case; 2 - first internal fan; 3 - second internal fan; 4 - external fan group; 5 - radiator; 6 - snow removal capacitor plate; 7 - snow removal power plate; 8 - snow removal inductor; 9 - junction box; 10 - face cover; 11 - AFCI function plate; 12 - PID module plate; 13 - power plate; 14 - capacitor plate; 15 - terminal; 16 - mounting bracket; 17 - power plate; 18 - screen display plate; 19 - AC sampling plate; 20 - LCD display screen; 21 - boost sampling plate; 22 - EMC shielding plate; 23 - external air duct plate; 24 - BOOST inductor; 25 - INV inductor; 26 - tray body; 27 - tray bracket. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and beneficial effects of the present application more clearly understood, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0030] It should be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0031] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0032] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0033] Please refer to Figure 1 The grid-connected machine provided by the embodiment of the present application will be described. The grid-connected machine is used for electrically connecting a photovoltaic panel. The grid-connected machine comprises a case 1, a tray assembly, an internal heat dissipation module, an external heat dissipation module, and a snow removal module. The tray assembly divides the space in the case 1 into a first accommodating cavity and a second accommodating cavity. The internal heat dissipation module is installed on the case 1 and located in the second accommodating cavity. The external heat dissipation module is installed on the case 1 and located on the outside of the case 1. The snow removal module is installed on the case 1. The snow removal module is used for controlling the photovoltaic panel to heat to remove snow on the photovoltaic panel.

[0034] Compared with the prior art, the grid-connected machine provided by the embodiment of the present application optimizes the thermodynamic design by setting the double heat dissipation structure of the internal heat dissipation module and the external heat dissipation module, effectively solves the problem of excessive heat or excessive concentration of the grid-connected machine during the working process, thereby improving the heat dissipation efficiency of the grid-connected machine and ensuring the stable operation of the grid-connected machine.

[0035] The grid-connected machine of the embodiment of the present application rationally divides the space in the case 1 into the first accommodating cavity and the second accommodating cavity by setting the tray assembly, which facilitates the classified installation of different components, not only optimizes the internal space layout of the case 1, but also makes the customer wiring steps more simple and the maintenance more convenient.

[0036] The grid-connected machine of the embodiment of the present application effectively improves the working capacity of the grid-connected machine in severe weather conditions by setting the snow removal module, which effectively removes the snow on the photovoltaic panel by controlling the photovoltaic panel heating, thereby improving the power generation efficiency of the photovoltaic panel.

[0037] In an embodiment of the present application, the internal heat dissipation module includes at least two internal fans, at least one of which is installed on the first side of the cabinet 1, and at least one of which is installed on the second side of the cabinet 1, the first side and the second side being two opposite sides of the cabinet 1.

[0038] In the embodiment, the internal fan can effectively guide the air circulation inside the cabinet 1 and enhance the heat dissipation effect inside the cabinet 1. The airflow generated by the rotation of the internal fan can effectively carry away the heat generated inside the cabinet 1, preventing the heat from accumulating inside the cabinet 1, thereby ensuring that the grid-connected machine can maintain a relatively low temperature during operation and improving the stability and service life of the grid-connected machine. At the same time, installing at least two internal fans on two opposite sides of the cabinet 1 can form a convection, further accelerating the heat dissipation, and ensuring that the grid-connected machine can still operate stably in a high-temperature environment.

[0039] In the embodiment, the internal heat dissipation module includes two internal fans, i.e. the first internal fan 2 and the second internal fan 3, please refer to Figure 1 and Figure 2 , the first internal fan 2 is installed on the left side of the cabinet 1, and the second internal fan 3 is installed on the right side of the cabinet 1, the left side and the right side being two opposite sides of the cabinet 1. Through such a setting, the heat inside the cabinet 1 can be more evenly distributed, avoiding the problem of excessive heat concentration, and further improving the heat dissipation effect of the grid-connected machine. Moreover, the first internal fan 2 and the second internal fan 3 can also be set in a staggered manner (for example, the first internal fan 2 is located below the left side of the cabinet 1, and the second internal fan 3 is located above the right side of the cabinet 1), which can further increase the area covered by the airflow of the internal fan and improve the heat dissipation effect.

[0040] In an embodiment of the present application, please refer to Figure 1 , the external heat dissipation module includes an external fan group 4 and a heat sink 5, the heat sink 5 is installed on the outside of the cabinet 1, the external fan group 4 is arranged close to the heat sink 5, and the external fan group is in sliding connection with the cabinet 1.

[0041] In this embodiment, by setting the external fan group 4 and the radiator 5, the heat dissipation efficiency of the grid-connected machine can be further improved. The airflow generated by the external fan group 4 can carry away the heat on the radiator 5, and the radiator 5 can conduct the heat inside the case 1 to the outside. The cooperation of the two can ensure that the grid-connected machine can still maintain good heat dissipation effect in high temperature environment. At the same time, the design of the external heat dissipation fan group and the sliding connection with the case 1 is not only convenient for installation and disassembly, but also conducive to the replacement and maintenance of the external fan group 4 in the later period. In addition, the position of the external fan group 4 can be adjusted according to actual needs to adapt to different heat dissipation needs. This design not only improves the heat dissipation efficiency, but also increases the flexibility and practicality of the grid-connected machine.

[0042] In this embodiment, please refer to Figure 1 The grid-connected machine also includes an external air duct plate 23, which is connected with the case 1 and forms an installation cavity together with the case 1. The external fan group 4 and the radiator 5 are arranged in the installation cavity, and the installation cavity is also provided with a BOOST inductor 24 and an INV inductor 25.

[0043] In an embodiment of the present application, please refer to Figure 1 and Figure 4 The snow removal module includes a snow removal capacitor plate 6, a snow removal power plate 7 and a snow removal inductor 8 which are electrically connected with each other. The snow removal capacitor plate 6 and the snow removal power plate 7 are installed on the tray assembly and located in the first containing cavity. The snow removal inductor 8 is installed on the outside of the case 1.

[0044] In this embodiment, the snow removal module is very simple and has little effect on the overall size and weight of the grid-connected machine. By setting the snow removal capacitor plate 6, the snow removal power plate 7 and the snow removal inductor 8, the heating control of the photovoltaic panel can be realized, so as to effectively remove the snow on the photovoltaic panel. The snow removal capacitor plate 6 is used to store electric energy and release electric energy to the snow removal power plate 7 when needed. The snow removal power plate 7 converts electric energy into heat energy and transmits it to the photovoltaic panel through the wire, so that the photovoltaic panel is heated and the snow is melted. The snow removal inductor 8 plays a role in stabilizing current and voltage, ensuring that the snow removal module can work stably. Such a design not only improves the working ability of the grid-connected machine in severe weather conditions, but also effectively prolongs the service life of the photovoltaic panel and improves the power generation efficiency.

[0045] At the same time, the snow removal capacitor plate 6 and the snow removal power plate 7 are installed on the tray assembly and located in the first containing cavity, which can make full use of the internal space of the case 1, so that the structure of the grid-connected machine is more compact, and the installation and transportation are convenient. In addition, the snow removal inductor 8 is installed on the outside of the case 1, which is convenient for heat dissipation and maintenance. The snow removal inductor 8 can be naturally air-cooled and will not be affected by the external heat dissipation module, further improving the reliability and practicality of the grid-connected machine.

[0046] In an embodiment of the present application, please refer to Figure 1 andFigure 3 The grid-connected machine further comprises a junction box 9 arranged outside the cabinet 1, and the junction box 9 is sealingly connected with the cabinet 1.

[0047] In the embodiment, the junction box 9 is arranged to facilitate the user to make electrical connection, and the design that the junction box 9 is sealingly connected with the cabinet 1 can effectively prevent dust, moisture and other sundries from entering the inside of the cabinet 1, thereby ensuring the electrical safety and stable operation of the grid-connected machine. The arrangement of the junction box 9 also makes the wiring step of the grid-connected machine more convenient, and the user only needs to connect the cable and other connecting members into the junction box 9, without the need to perform complicated internal wiring operation, thereby reducing the installation difficulty and maintenance cost. In addition, the junction box 9 can be configured with different interfaces and connecting members according to the needs, so as to adapt to different electrical connection requirements, thereby improving the flexibility and applicability of the grid-connected machine.

[0048] In an embodiment of the present application, please refer to Figure 1 The grid-connected machine further comprises a face cover 10 covering the opening of the cabinet 1 and sealingly connected with the cabinet 1.

[0049] In the embodiment, the arrangement of the face cover 10 not only protects the components inside the cabinet 1 from the interference and damage of the external environment, but also prevents the personnel from being touched or operated by mistake, thereby improving the safety and reliability of the grid-connected machine. The face cover 10 is made of high-quality material and has good sealing performance and corrosion resistance, which can effectively isolate harmful substances such as dust and moisture, thereby ensuring that the grid-connected machine can still operate normally in harsh environments. At the same time, the design of the face cover 10 is also convenient to open and close, thereby facilitating the user to maintain and overhaul, and improving the maintainability and convenience of the grid-connected machine.

[0050] In the embodiment, please refer to Figure 1 The first accommodating cavity is further provided with a power supply board 17, a screen display board 18 and an alternating current sampling board 19 which are electrically connected with each other; the second accommodating cavity is further provided with a voltage boosting sampling board 21 and an EMC shielding board 22; and the face cover 10 is further provided with an LCD display screen 20 which is electrically connected with the screen display board 18.

[0051] In an embodiment of the present application, the grid-connected machine further comprises a control module which is electrically connected with the snow removal module.

[0052] In the embodiment, the control module can precisely control the snow removal module, automatically adjusts the heating power and heating time of the snow removal module according to the snow accumulation on the photovoltaic panel, so as to achieve rapid and efficient snow removal effect. At the same time, the control module can also monitor the operating state of the grid-connected machine in real time, including temperature, current, voltage and other parameters, thereby ensuring that the grid-connected machine operates in a safe and stable state.

[0053] In an embodiment of the present application, please refer to Figure 1And Figure 3 The control module comprises an AFCI function board 11 arranged in the second accommodating cavity.

[0054] In this embodiment, the AFCI function board 11 has an arc fault circuit interrupting function, which can quickly cut off the circuit when an arc fault is detected, thereby preventing the occurrence of safety accidents such as fire. Such a design not only improves the safety of the grid-connected machine, but also meets the safety standards and requirements of modern electrical equipment. Meanwhile, arranging the AFCI function board 11 in the second accommodating cavity can make full use of the internal space of the machine case 1, so that the structure of the grid-connected machine is more compact and reasonable.

[0055] In one embodiment of the present application, please refer to Figure 1 And Figure 4 The control module further comprises a PID module board 12, a power board 13 and a capacitor board 14 which are electrically connected to each other; the power board 13 is arranged in the second accommodating cavity, and the PID module board 12 and the capacitor board 14 are arranged close to the power board 13.

[0056] In this embodiment, the PID module board 12 is used to process and control the running logic of the grid-connected machine, the power board 13 is responsible for converting electrical energy into energy required for the operation of the grid-connected machine, and the capacitor board 14 plays a role in energy storage and voltage stabilization. Such a design makes the function of the control module more perfect, and enables the overall control and monitoring of the grid-connected machine. Meanwhile, arranging the power board 13 in the second accommodating cavity and arranging the PID module board 12 and the capacitor board 14 close to the power board 13 can ensure that the electrical connection inside the control module is more compact and reliable, thereby improving the overall performance and stability of the grid-connected machine.

[0057] Under the comprehensive action of the PID module board 12, the power board 13 and the capacitor board 14, the grid-connected machine has input reverse connection protection, input DC switch, DC surge protection, input over / under voltage protection; output short circuit protection, output over / under voltage protection, output over / under frequency protection, output overcurrent protection; BUS over / under voltage protection, internal over-temperature protection and load reduction, fan fault detection, Relay fault detection; insulation impedance detection, DCI protection, etc., so as to ensure the safe, stable and reliable operation of the system.

[0058] In this embodiment, please refer to Figure 1 The grid-connected machine further comprises a mounting bracket 16 arranged in the machine case 1, and the PID module board 12 is mounted on the mounting bracket 16.

[0059] In one embodiment of the present application, please refer to Figure 1 And Figure 3 The grid-connected machine further comprises a plurality of terminals 15 mounted on the machine case 1 and electrically connected to the control module.

[0060] In the embodiment, the terminals 15 are used to connect external cables and lines, so as to realize electrical connection between the grid-connected machine and an external grid or photovoltaic panel. The arrangement of the plurality of terminals 15 can also meet different electrical connection requirements, and improve flexibility and applicability of the grid-connected machine.

[0061] The grid-connected machine of the embodiment of the application supports up to nine MPPT (Maximum Power Point Tracking), supports multi-machine anti-flow and can operate simultaneously with the same series of models. In terms of communication, RS485, DRMS, Wifi / Bluetooth module, 4G module and other functions can be selected.

[0062] In the embodiment, please refer to Figure 1 The tray assembly includes a tray body 26 and a tray support 27, and the tray body 26 is installed on the inner side wall of the cabinet 1 through the tray support 27.

[0063] The above only describes the preferred embodiments of the application and is not intended to limit the application. Any modification, equivalent replacement and improvement made within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A grid-tie machine for electrically connecting photovoltaic panels, characterized in that, The grid-connected machine comprises: a cabinet; a tray assembly, which divides the space in the cabinet into a first accommodating cavity and a second accommodating cavity; an internal heat dissipation module, which is installed on the cabinet and located in the second accommodating cavity; an external heat dissipation module, which is installed on the cabinet and located outside the cabinet; a snow removal module, which is installed on the cabinet and used for controlling the photovoltaic panel heating to remove the snow on the photovoltaic panel.

2. The grid-tie machine of claim 1, wherein, The internal heat dissipation module comprises at least two internal fans, at least one of which is installed on the first side of the cabinet and at least one of which is installed on the second side of the cabinet, the first side and the second side being two opposite sides of the cabinet.

3. The grid-tie machine of claim 1, wherein, The external heat dissipation module comprises an external fan group and a radiator, the radiator being installed outside the cabinet, the external fan group being arranged close to the radiator, and the external fan group being in sliding connection with the cabinet.

4. The grid-tie machine of claim 1, wherein, The snow removal module comprises a snow removal capacitor plate, a snow removal power plate and a snow removal inductor which are electrically connected with each other, the snow removal capacitor plate and the snow removal power plate being installed on the tray assembly and located in the first accommodating cavity, and the snow removal inductor being installed outside the cabinet.

5. The grid-tie machine of claim 1, wherein, The grid-connected machine further comprises a junction box, which is arranged outside the cabinet and in sealing connection with the cabinet.

6. The grid-tie machine of claim 1, wherein, The grid-connected machine further comprises a face cover, which covers the opening of the cabinet and is in sealing connection with the cabinet.

7. The grid-tie machine of any of claims 1-6, wherein, The grid-connected machine further comprises a control module, which is in electrical connection with the snow removal module.

8. The grid-tie machine of claim 7, wherein, The control module comprises an AFCI function plate, which is arranged in the second accommodating cavity.

9. The grid-tie machine of claim 7, wherein, The control module further comprises a PID module plate, a power plate and a capacitor plate which are electrically connected with each other, the power plate being arranged in the second accommodating cavity, and the PID module plate and the capacitor plate being arranged close to the power plate.

10. The grid-tie machine of claim 7, wherein, The grid-connected machine further comprises a plurality of terminals, which are installed on the cabinet and in electrical connection with the control module.

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