Photovoltaic inverter grid-connected high-low voltage ride-through test equipment

Abstract

The utility model relates to the field of photovoltaic inverter testing, and discloses photovoltaic inverter grid-connected high and low voltage ride-through testing equipment which comprises a voltage ride-through testing equipment cabinet body, a mounting box is arranged on one side of the voltage ride-through testing equipment cabinet body, and metal net windows are movably arranged on the two sides of the mounting box. The metal net window is provided with first cleaning brushes used for cleaning the metal net window, and the first cleaning brushes are movably arranged on the two sides of the mounting box. The metal net windows used for ventilation are arranged on the two sides of the mounting box, the first cleaning brushes are arranged on the metal net windows, under the action of the driving mechanism, the metal net windows are cleaned, a certain heat dissipation effect can be achieved through the arrangement of the metal net windows, meanwhile, the first cleaning brushes are driven by the driving mechanism to clean the metal net windows, and the cleaning efficiency is improved. The ventilation and heat dissipation effects of the metal net window can be kept, damage to electronic components in the test equipment due to the fact that the metal net window is blocked by dust is avoided, meanwhile, manual cleaning work is omitted, and certain labor cost is saved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic inverter testing, and in particular to a photovoltaic inverter grid-connected high and low voltage ride-through testing device. Background Art

[0002] A photovoltaic inverter is a device that converts the direct current generated by a solar photovoltaic array into alternating current so that it can be fed into the grid or supplied to local loads;

[0003] When the grid voltage of the photovoltaic inverter rises sharply, i.e., high voltage ride-through, or drops, i.e., low voltage ride-through, the photovoltaic inverter grid-connected high and low voltage ride-through test equipment is needed to check whether the photovoltaic inverter can maintain continuous connection and stable operation under abnormal grid voltage conditions, so as to verify whether the photovoltaic inverter can meet the requirements of stable operation of the power system;

[0004] When the photovoltaic inverter is running, the internal temperature of the test equipment will continue to rise. If the heat is not dissipated in time and effectively, the performance of the internal components may decline and the life may be shortened. In severe cases, it may even cause serious consequences such as overheating protection, equipment failure and even fire. Therefore, most of the existing photovoltaic inverter grid-connected high and low voltage ride-through test equipment have a heat dissipation function. At the same time, ventilation mesh holes are often opened on the side walls of the equipment. However, as the test equipment is used for a longer time, the ventilation mesh holes are often blocked by increasingly accumulated dust due to lack of regular cleaning, which will hinder the air flow inside the test equipment and reduce the heat dissipation efficiency of the heat dissipation mechanism. The heat inside the equipment cannot be effectively discharged, which may cause the internal electronic components to perform poorly and shorten their life due to overheating. In severe cases, it may even cause the components to burn out. Regular manual cleaning requires a lot of manpower costs. In order to solve the above problems, a photovoltaic inverter grid-connected high and low voltage ride-through test equipment is proposed.

[0005] The above information disclosed in the background technology is only used to increase the understanding of the background technology of the present application, and therefore, it may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0006] In order to solve the photovoltaic inverter testing problem, the present application provides a photovoltaic inverter grid-connected high and low voltage ride-through test device.

[0007] The photovoltaic inverter grid-connected high and low voltage ride-through test equipment provided in this application adopts the following technical solutions:

[0008] A photovoltaic inverter grid-connected high and low voltage ride-through test device comprises a voltage ride-through test device cabinet, a mounting box is arranged on one side of the voltage ride-through test device cabinet, metal mesh windows are movably arranged on both sides of the mounting box, a cleaning brush for cleaning the metal mesh window is arranged on the metal mesh window, and the cleaning brush is movably arranged on both sides of the mounting box; a driving mechanism for driving the cleaning brush for cleaning is also arranged on the mounting box.

[0009] Preferably, four support columns are provided on the metal mesh window, an elastic member is provided on one side of the support column, the other end of the elastic member is abutted against the inner wall of the installation box, the installation box is provided with a through opening corresponding to the support column, and the support column is slidably arranged in the through opening.

[0010] Preferably, a coolant tank is provided inside the installation box, heat conducting plates are provided on both sides of the coolant tank, a cold air duct is provided inside the coolant tank, both ends of the cold air duct extend to the top and the side of the coolant tank respectively, an air outlet scoop is provided at one end of the cold air duct extending to the side of the coolant tank, a fan is provided on the side of the cold air duct close to the air outlet scoop, a cooling fan is also provided on the coolant tank, and a box door is rotatably provided on one side of the installation box.

[0011] Preferably, the driving mechanism comprises a driving component and a linkage component;

[0012] The driving component comprises a threaded rod, a guide rod and a motor, wherein the threaded rod and the guide rod are arranged on the mounting box through a connecting block, the output end of the motor is connected to the threaded rod, and the two ends of the cleaning brush are movably connected to the threaded rod and the guide rod respectively;

[0013] The linkage component comprises a connecting rod and a second cleaning brush. The connecting rod is fixedly connected to one side of the two first cleaning brushes close to each other, and the second cleaning brush is fixedly connected to the connecting rod.

[0014] Preferably, the top of the installation box is also provided with ventilation holes corresponding to the cold air duct and the heat dissipation fan.

[0015] Preferably, the end of the cold air duct located at the top of the installation box is gap-matched with the cleaning end of the second cleaning brush.

[0016] Preferably, a circulation fan is provided at the bottom of the voltage ride-through test equipment cabinet.

[0017] Preferably, a cabinet door is rotatably provided on one side of the cabinet of the voltage ride-through test equipment.

[0018] Preferably, shutters are provided on both sides of the voltage ride-through test equipment cabinet.

[0019] In summary, this application includes the following beneficial technical effects:

[0020] By arranging metal mesh windows for ventilation on both sides of the installation box, a cleaning brush for cleaning the metal mesh windows is arranged on the metal mesh windows. Under the action of the driving mechanism, the metal mesh windows can be cleaned. Compared with the prior art, the arrangement of the metal mesh windows can play a certain role in heat dissipation. At the same time, the driving mechanism drives the cleaning brush to clean the metal mesh windows, which is beneficial to maintaining the ventilation and heat dissipation effect of the metal mesh windows, thereby maintaining the air flow in the cabinet of the voltage crossing test equipment, avoiding damage to the internal electronic components of the test equipment due to the clogging of the metal mesh windows by dust, and automatically cleaning the dust, which can save the work of manual cleaning and save a certain amount of labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the embodiment of the application;

[0022] Figure 2 It is a schematic diagram of the overall structure of the embodiment of the application;

[0023] Figure 3 is a rear perspective structural schematic diagram of an embodiment of the application;

[0024] Figure 4 is a schematic side cross-sectional view of the installation box of an embodiment of the application;

[0025] Figure 5 yes Figure 4 A magnified schematic diagram of the structure in the middle;

[0026] Figure 6 is a schematic side cross-sectional view of a coolant tank of an embodiment of the application;

[0027] Figure 7 It is a schematic diagram of the overall structure of the coolant tank of the application embodiment.

[0028] Explanation of the accompanying reference numerals: 1. voltage ride-through test equipment cabinet; 2. cabinet door; 3. shutters; 4. installation box; 5. metal mesh window; 6. threaded rod; 7. guide rod; 8. cleaning brush one; 9. connecting rod; 10. cleaning brush two; 11. support column; 12. elastic part; 13. coolant tank; 14. heat conducting plate; 15. cold air duct; 16. air outlet scoop; 17. motor; 18. circulation fan; 19. fan; 20. cooling fan; 21. cabinet door. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-7 This application is described in further detail.

[0030] The present application embodiment discloses a photovoltaic inverter grid-connected high and low voltage ride-through test device. Figure 1-7A photovoltaic inverter grid-connected high and low voltage ride-through test device, comprising a voltage ride-through test device cabinet 1, a mounting box 4 is arranged on one side of the voltage ride-through test device cabinet 1, metal mesh windows 5 are movably arranged on both sides of the mounting box 4, cleaning brushes 8 for cleaning the metal mesh windows 5 are arranged on the metal mesh windows 5, and the cleaning brushes 8 are movably arranged on both sides of the mounting box 4; a driving mechanism for driving the cleaning brushes 8 for cleaning is also arranged on the mounting box 4;

[0031] It should be noted that the high and low voltage ride-through test equipment for the photovoltaic inverter connected to the grid in the voltage ride-through test equipment cabinet 1 is mainly used to simulate the abnormal situation of voltage drop or increase in the power grid, so as to verify whether the photovoltaic inverter can maintain stable operation under such conditions, not be disconnected from the grid, and be able to quickly synchronize back to the grid after the voltage is restored. The test steps include: setting test conditions, presetting the amplitude, duration and recovery rate of voltage drop or increase; connecting the photovoltaic inverter to the test equipment, and starting the test program; the test equipment simulates grid voltage anomalies according to preset scenarios; real-time monitoring of the operating status, current and power output of the inverter during voltage anomalies; analyzing whether the performance of the inverter in the voltage ride-through stage meets the requirements of relevant national standards and technical specifications. The working principles of the above technical features are well-known technologies in the field, so they will not be elaborated here.

[0032] By adopting the above technical solution, the setting of the metal mesh window 5 can play a certain role in heat dissipation. Under the action of the driving mechanism, the cleaning brush 8 cleans the mesh surface of the metal mesh window 5, which is beneficial to maintaining the ventilation and heat dissipation effect of the metal mesh window 5, thereby maintaining the air flow inside the cabinet 1 of the voltage crossing test equipment.

[0033] Reference Figure 5 , four support columns 11 are arranged on the metal mesh window 5, an elastic member 12 is arranged on one side of the support column 11, the other end of the elastic member 12 is against the inner wall of the installation box 4, and the installation box 4 is provided with a through opening corresponding to the support column 11, and the support column 11 is slidably arranged in the through opening;

[0034] It should be noted that the elastic member 12 can be a spring, a rubber ring, etc., and any material that can support and rebound the support column 11 can be used. At the same time, the elasticity of the elastic member 12 can shrink when there is a slightly stronger air flow.

[0035] By adopting the above technical scheme, the metal mesh window 5 can dissipate heat naturally through the metal mesh window 5 under the action of the support column 11 and the elastic member 12 when the test equipment is not in operation. When the test equipment is in operation, the temperature in the cabinet 1 of the voltage-through test equipment increases, and other heat dissipation mechanisms are used to accelerate the air flow rate in the cabinet 1 of the voltage-through test equipment. The elastic member 12 contracts under the push of a slightly stronger air flow rate, so that the support column 11 is close to the inner wall of the installation box 4, thereby generating a larger ventilation gap between the metal mesh window 5 and the installation box 4, which can accelerate the heat dissipation speed in the cabinet 1 of the voltage-through test equipment and improve the heat dissipation efficiency.

[0036] Reference Figure 2-7 A coolant tank 13 is provided inside the installation box 4, and heat conducting sheets 14 are provided on both sides of the coolant tank 13. A cold air duct 15 is provided inside the coolant tank 13, and both ends of the cold air duct 15 extend to the top and the side of the coolant tank 13 respectively. An air outlet 16 is provided at one end of the cold air duct 15 extending to the side of the coolant tank 13, and a fan 19 is provided on the side of the cold air duct 15 close to the air outlet 16. A heat dissipation fan 20 is also provided on the coolant tank 13, and a box door 21 is rotatably provided on one side of the installation box 4;

[0037] It should be noted that there is a certain gap between the heat conducting sheet 14 and the inner wall of the installation box 4. The cold air duct 15 extends to the port on the top of the installation box 4 for the input of natural air. When the coolant tank 13 is maintained, the port can be recovered to a position flush with the top of the coolant tank 13. A metal filter is provided at the top of the installation box 4 corresponding to the port. The port extending to the side of the installation box 4 is used for the output of cooling air. The cold air duct 15 is arranged in a curved shape inside the coolant tank 13. The air outlet scoop 16 is fixed to one side of the coolant tank 13 by the mounting plate at a certain angle upward.

[0038] It should be further explained that the coolant in the coolant tank 13 is relatively still inside the coolant tank 13, which can effectively reduce the damage caused by coolant leakage to the electronic components in the voltage ride through test equipment cabinet 1;

[0039] By adopting the above technical scheme, natural air is sucked into one end of the cold air duct 15 under the action of the fan 19, and after being cooled by the coolant in the coolant tank 13, the cooled air is input into the voltage crossing test equipment cabinet 1 through the air outlet 16. Due to the setting angle of the air outlet 16 and the principle of natural convection of air, the characteristics of cold air sinking and hot air rising can be used to make the input cooling air flow from top to bottom, so that the temperature in the voltage crossing test equipment cabinet 1 is uniformly reduced. The setting of the box door 21 facilitates the maintenance of the coolant tank 13, such as replacing the cold air duct 15 or replacing the coolant, and the heat dissipation fan 20 is used to dissipate the heat of the coolant in the coolant tank 13, thereby ensuring the cooling effect.

[0040] Reference Figure 3-6 , the driving mechanism includes a driving component and a linkage component;

[0041] The driving component includes a threaded rod 6, a guide rod 7 and a motor 17. The threaded rod 6 and the guide rod 7 are arranged on the mounting box 4 through a connecting block. The output end of the motor 17 is connected to the threaded rod 6. The two ends of the cleaning brush 8 are movably connected to the threaded rod 6 and the guide rod 7 respectively.

[0042] The linkage component includes a connecting rod 9 and a cleaning brush 2 10. The connecting rod 9 is fixedly connected to one side of the two cleaning brushes 8 close to each other, and the cleaning brush 2 10 is fixedly connected to the connecting rod 9.

[0043] It can be understood by those skilled in the art that the output end of the motor is the end of the rotor thereon;

[0044] It should be noted that the threaded rod 6 is rotatably arranged between the two connecting blocks, the guide rod 7 is fixed between the two connecting blocks, the cleaning brush 8 is threadedly connected to the threaded rod 6 and slidably connected to the guide rod 7, and the part of the cleaning brush 8 located on the installation box 4 has a certain gap with the top of the installation box 4;

[0045] It should be further explained that the linkage component also includes a guide rod 7 fixed by two sets of connecting blocks, and a cleaning brush 8 is slidably arranged on the two guide rods 7. Here, the same arrangement as the driving component can be adopted, and the guide rod 7 is replaced by a threaded rod driven by a motor, so that the cleaning brush 8 cleans the mesh surface of the metal mesh window 5.

[0046] By adopting the above technical solution, the threaded rod 6 is driven by the motor 17 to drive the cleaning brush 1 8 to move back and forth horizontally to clean the mesh surface of the metal mesh window 5, and at the same time drives the cleaning brush 2 10 to clean the cooling fan 20 and the suction port of the cold air duct 15.

[0047] Reference Figure 3-4 , a vent is also provided on the top of the installation box 4 corresponding to the cold air duct 15 and the heat dissipation fan 20;

[0048] By adopting the above technical solution, the provision of the vents facilitates the cold air duct 15 to inhale natural air, and at the same time facilitates the heat dissipation fan 20 to dissipate the heat of the coolant in the coolant tank 13 .

[0049] Reference Figure 3-4 The end of the cold air duct 15 located at the top of the installation box 4 is gap-matched with the cleaning end of the cleaning brush 10;

[0050] It should be noted that the end of the cold air duct 15 located at the top of the installation box 4 has a portion extending outward, so that the cold air duct 15 can better absorb external natural air, and the cleaning end of the cleaning brush 10 is the portion in contact with the top of the installation box 4;

[0051] By adopting the above technical solution, the cleaning end of the cleaning brush 10 is fitted with the top of the installation box 4, and the port of the cold air duct 15 located at the top of the installation box 4 is provided with a plurality of through grooves corresponding to the cleaning end of the cleaning brush 10, so that the cleaning brush 10 can pass through the port of the cold air duct 15 located at the top of the installation box 4 and perform cleaning.

[0052] Reference Figure 2 , a circulation fan 18 is provided at the bottom of the voltage ride-through test equipment cabinet 1;

[0053] By adopting the above technical solution, the setting of the circulation fan 18 can effectively accelerate the air convection in the voltage ride through test equipment cabinet 1, and at the same time can make the temperature of each part in the voltage ride through test equipment cabinet 1 tend to be consistent, preventing local overheating.

[0054] Reference Figure 1-2 A cabinet door 2 is rotatably provided on one side of a cabinet 1 of the voltage ride-through test equipment;

[0055] By adopting the above technical solution, the cabinet door 2 is hinged to the voltage ride-through test equipment cabinet 1, which facilitates the installation, repair and maintenance of the test equipment.

[0056] Reference Figure 1-3 , shutters 3 are provided on both sides of the voltage ride-through test equipment cabinet 1;

[0057] It should be noted that the shutters 3 are arranged at the upper positions on both sides of the voltage ride through test equipment cabinet 1. Compared with being arranged at the lower or middle part, being arranged at the upper part can reduce the chance of dust falling into the equipment to a certain extent, because dust usually settles in the air, and the upper opening can take advantage of this feature to reduce the dust accumulation inside the voltage ride through test equipment cabinet 1;

[0058] By adopting the above technical solution, opening shutters 3 at the upper positions on both sides of the voltage ride-through test equipment cabinet 1 is conducive to the natural rise of hot air and its discharge through the shutters 3, and the natural convection principle of rising hot air is used to effectively dissipate heat.

[0059] The implementation principle of a photovoltaic inverter grid-connected high and low voltage ride-through test device in the embodiment of the present application is as follows: when the test device is on standby, the metal mesh windows 5 and the shutters 3 on both sides of the installation box 4 can be used to naturally ventilate and dissipate heat in the voltage ride-through test device cabinet 1, and at the same time, the auxiliary circulation fan 18 can be used for natural heat dissipation. When the test device is running, the temperature in the voltage ride-through test device cabinet 1 rises rapidly, and the fan 19 is started to inhale external natural air through the cold air duct 15. After the coolant in the coolant tank 13 absorbs heat and cools, the air is input into the voltage ride-through test device cabinet 1 through the air outlet 16. The air outlet 16 is tilted so that the coolant can be cooled. The cooled air can flow from top to bottom in the voltage ride through test equipment cabinet 1 to evenly reduce the temperature in the voltage ride through test equipment cabinet 1. At the same time, the circulation fan 18 is turned on to accelerate the air convection in the voltage ride through test equipment cabinet 1, so that the temperatures of various parts in the voltage ride through test equipment cabinet 1 tend to be consistent, thereby preventing local overheating. When it is necessary to clean the mesh surface of the metal mesh window 5, the driving motor 17 drives the cleaning brush 1 8 to move back and forth horizontally to clean the mesh surface of the metal mesh window 5. At the same time, the cleaning brush 2 10 is driven to clean the cooling fan 20 and the suction port of the cold air duct 15 to maintain the ventilation and heat dissipation effect of the metal mesh window 5.

[0060] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0061] Secondly: In the drawings of the embodiments disclosed in the present utility model, only the structures related to the embodiments disclosed in the present utility model are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present utility model can be combined with each other;

[0062] Finally: The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present utility model should be included in the protection scope of the present utility model.

[0063] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A photovoltaic inverter grid-connected high and low voltage ride-through test device, comprising a voltage ride-through test device cabinet (1), characterized in that: A mounting box (4) is provided on one side of the voltage ride-through test equipment cabinet (1); metal mesh windows (5) are movably provided on both sides of the mounting box (4); a cleaning brush (8) for cleaning the metal mesh window (5) is provided on the metal mesh window (5); the cleaning brush (8) is movably provided on both sides of the mounting box (4); and a driving mechanism for driving the cleaning brush (8) for cleaning is also provided on the mounting box (4). The driving mechanism comprises a driving component and a linkage component; The driving component comprises a threaded rod (6), a guide rod (7) and a motor (17); the threaded rod (6) and the guide rod (7) are arranged on the mounting box (4) through a connecting block; the output end of the motor (17) is connected to the threaded rod (6); and the two ends of the cleaning brush (8) are movably connected to the threaded rod (6) and the guide rod (7) respectively; The linkage component comprises a connecting rod (9) and a second cleaning brush (10); the connecting rod (9) is fixedly connected to a side of the two first cleaning brushes (8) close to each other; and the second cleaning brush (10) is fixedly connected to the connecting rod (9).

2. A photovoltaic inverter grid-connected high and low voltage ride through test equipment according to claim 1, characterized in that: Four support columns (11) are arranged on the metal mesh window (5), an elastic member (12) is arranged on one side of the support column (11), the other end of the elastic member (12) is against the inner wall of the installation box (4), the installation box (4) is provided with a through opening corresponding to the support column (11), and the support column (11) is slidably arranged in the through opening.

3. A photovoltaic inverter grid-connected high and low voltage ride through test equipment according to claim 1, characterized in that: A coolant tank (13) is arranged inside the installation box (4), and heat conducting plates (14) are arranged on both sides of the coolant tank (13). A cold air duct (15) is arranged inside the coolant tank (13), and the two ends of the cold air duct (15) respectively extend to the top and the side of the coolant tank (13). An air outlet (16) is arranged at one end of the cold air duct (15) extending to the side of the coolant tank (13), and a fan (19) is arranged on the side of the cold air duct (15) close to the air outlet (16). A heat dissipation fan (20) is also arranged on the coolant tank (13), and a box door (21) is rotatably arranged on one side of the installation box (4).

4. A photovoltaic inverter grid-connected high and low voltage ride-through test equipment according to claim 3, characterized in that: The top of the installation box (4) is also provided with ventilation openings corresponding to the cold air duct (15) and the heat dissipation fan (20).

5. A photovoltaic inverter grid-connected high and low voltage ride-through test equipment according to claim 4, characterized in that: The end of the cold air pipe (15) located at the top of the installation box (4) is gap-matched with the cleaning end of the second cleaning brush (10).

6. A photovoltaic inverter grid-connected high and low voltage ride through test equipment according to claim 1, characterized in that: A circulation fan (18) is provided at the bottom of the voltage ride-through test equipment cabinet (1).

7. A photovoltaic inverter grid-connected high and low voltage ride-through test equipment according to claim 1, characterized in that: A cabinet door (2) is rotatably provided on one side of the voltage ride-through test equipment cabinet (1).

8. The photovoltaic inverter grid-connected high and low voltage ride through test equipment according to claim 1, characterized in that: Shutters (3) are provided on both sides of the voltage ride-through test equipment cabinet (1).

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