Photovoltaic new energy grid-connected cabinet

Abstract

The invention discloses a photovoltaic new energy grid-connected cabinet, and belongs to the technical field of new energy power generation, the photovoltaic new energy grid-connected cabinet comprises a grid-connected cabinet, a cabinet door is hinged to the grid-connected cabinet, a bolt is fixedly connected to the cabinet door, a bolt seat is fixedly connected to the side wall of the grid-connected cabinet, and two pieces of mounting flat iron are fixedly connected in the grid-connected cabinet. A circuit breaker is mounted on the mounting flat iron, an auxiliary switch box is arranged on one side of the circuit breaker, the auxiliary switch box is fixedly connected to the inner wall of the grid-connected cabinet, and an anti-islanding mechanism is arranged in the auxiliary switch box. The anti-islanding mechanism is arranged, the auxiliary switch box is used for being in linkage with the circuit breaker, control over the cabinet door is achieved, the safety of the grid-connected cabinet is enhanced, the system reliability is improved, implementation of safety measures is simplified, the dampproof mechanism is arranged, automatic control is achieved, and the device reliability is improved while the dampproof effect of the grid-connected cabinet is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy power generation, and specifically relates to a photovoltaic new energy grid connection cabinet. Background Art

[0002] The photovoltaic new energy grid connection cabinet is a key device in the photovoltaic power generation system, used to achieve the safe and efficient connection between the photovoltaic array and the power grid, ensure the power quality and meet the grid connection specifications. With the global energy structure transforming towards renewable energy, the installed capacity of photovoltaic power generation has increased rapidly, but the intermittency, volatility and DC characteristics of photovoltaic power sources pose challenges to the stability of the power grid.

[0003] The existing photovoltaic new energy grid connection cabinets still have the following deficiencies:

[0004] 1. When the photovoltaic power generation system is operating in parallel with the grid, if a fault occurs and the photovoltaic system is not intervened, it will still generate power to the load through the grid connection cabinet, and an island will be formed in a local area. The island effect will pose great safety risks. If a power maintenance worker opens the cabinet door of the grid connection cabinet without knowing it, it will lead to electric shock and equipment damage.

[0005] 2. When the photovoltaic new energy grid connection cabinet is in use, it is necessary to ensure its heat dissipation and moisture resistance to ensure the stable operation of the equipment in a humid environment. When the photovoltaic new energy grid connection cabinet encounters humid air, a series of adverse consequences may occur, such as a decrease in electrical insulation performance, accelerated metal corrosion and damage to electronic components, etc. Summary of the Invention

[0006] In order to overcome the above defects, the present invention provides a photovoltaic new energy grid connection cabinet, which solves the problems in the prior art.

[0007] To achieve the above object, the present invention provides the following technical solution: A photovoltaic new energy grid connection cabinet, comprising:

[0008] A grid connection cabinet, on which a cabinet door is hinged, a bolt is fixedly connected to the cabinet door, a bolt seat is fixedly connected to the side wall of the grid connection cabinet, two mounting flat irons are fixedly connected inside the grid connection cabinet, a circuit breaker is mounted on the mounting flat iron, an auxiliary switch box is arranged on one side of the circuit breaker, the auxiliary switch box is fixedly connected to the inner wall of the grid connection cabinet, and an anti-island mechanism is arranged inside the auxiliary switch box;

[0009] The anti-islanding mechanism includes a driving gear and a driven gear rotatably connected to the side wall of the auxiliary switch box, the rotating shaft of the toggle lever on the circuit breaker passes through the circuit breaker and the auxiliary switch box and is coaxially fixedly connected to the driving gear, the driving gear and the driven gear are meshed with each other, the driven gear is coaxially fixedly connected with a driving bevel gear, the inner wall of the auxiliary switch box is rotatably connected with a driven bevel gear, the driving bevel gear and the driven bevel gear are meshed with each other, the driven bevel gear is coaxially fixedly connected with a threaded rod, the threaded rod is threadedly connected with a threaded sleeve, and two limiting screws are fixedly connected to the inner wall of the auxiliary switch box corresponding to the driven bevel gear. The limiting slide rod passes through the threaded sleeve and is slidably connected thereto, a buffer substrate is fixedly connected to one side of the threaded sleeve, a matching substrate is slidably connected to the buffer substrate, a telescopic rod and a buffer spring are fixedly connected to the buffer substrate, the buffer spring sleeve is arranged on the outside of the telescopic rod, the output end of the telescopic rod and the end of the buffer spring away from the buffer substrate are fixedly connected to the matching substrate, a conductive slider is fixedly connected to the side of the matching substrate away from the buffer substrate, and an A wiring terminal and a B wiring terminal are fixedly connected to the side walls of the auxiliary switch box, respectively, and the A wiring terminal and the B wiring terminal are matched with the conductive slider;

[0010] A moisture-proof mechanism is arranged in the grid-connected cabinet.

[0011] As a further solution of the present invention: the moisture-proof mechanism includes flow ports opened on both sides of the grid-connected cabinet, and moisture absorption boxes are fixedly connected to the inner walls on both sides of the grid-connected cabinet, and the moisture absorption box has a moisture-proof fan built in it.

[0012] As a further solution of the present invention: limiting tracks are fixedly connected to the inner walls on both sides of the moisture absorption box, a silica gel box is slidably connected between the two limiting tracks, and the silica gel box is filled with silica gel particles.

[0013] As a further solution of the present invention: two matching telescopic rods are fixedly connected to the inner top of the moisture absorption box, and the outer sleeve of the matching telescopic rods is provided with a tension spring. The output ends of the two matching telescopic rods are fixedly connected to the silica gel box, and the bottom of the tension spring is against the silica gel box.

[0014] As a further solution of the present invention: a button switch is provided at the inner bottom of the silica gel box, and the button switch is electrically connected to the two moisture-proof fans on the corresponding side.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention realizes the control of the cabinet door by setting an anti-islanding mechanism and using an auxiliary switch box to link the circuit breaker, which achieves the following beneficial effects:

[0017] Enhanced safety: When the circuit breaker is closed, it means that the PV system is operating in connection with the public grid. At this time, if someone tries to open the cabinet door for maintenance or inspection, the auxiliary switch box will cut off the cabinet door switch circuit, ensuring that the cabinet door cannot be opened, thus avoiding accidental electric shock or other dangerous situations;

[0018] Improve system reliability: Prevent the occurrence of islanding effect through physical isolation, improving the safety and stability of the entire system. Even if other anti-islanding technologies fail, this mechanical protection measure can provide an additional layer of protection.

[0019] Simplify the implementation of safety measures: This design is relatively simple and straightforward, easy to implement and verify its effectiveness, reducing problems that may occur in complex electronic detection or control systems.

[0020] 2. By setting up a moisture-proof mechanism in the present invention, when encountering a humid environment, the silica gel particles absorb water, increasing in weight, causing the silica gel box to move downward, turning on the push-button switch, driving the moisture-proof fan, and accelerating the air circulation. When leaving the humid environment, due to the temperature generated by the operation of the electronic components in the grid-connected cabinet, along with the airflow, it will dry the silica gel particles again, and the silica gel box will gradually return to its initial weight, which reflects the following beneficial effects:

[0021] Automated control is achieved: The moisture-proof measures are automatically triggered through physical properties (silica gel absorbing moisture and increasing weight), without the need for additional electronic sensors or control systems, simplifying the operation process;

[0022] Energy-saving and efficient: The moisture-proof fan is only started when high humidity is detected, avoiding unnecessary energy consumption, improving energy utilization efficiency, and dehydrating and regenerating the silica gel by means of the heat generated during equipment operation, reducing the demand for external energy sources and achieving effective utilization of resources;

[0023] Strong reliability: Judging the humidity condition by relying on physical phenomena rather than electronic components reduces the risk of misjudgment caused by electronic failures and improves the reliability of the system. Brief Description of the Drawings

[0024] Figure 1 is a three-dimensional structure diagram of the present invention;

[0025] Figure 2 is a three-dimensional structure diagram of the circuit breaker and auxiliary switch box parts of the present invention;

[0026] Figure 3 is a three-dimensional internal structure diagram of the auxiliary switch box part of the present invention;

[0027] Figure 4 is a three-dimensional structure diagram of the threaded rod part of the present invention;

[0028] Figure 5 Schematic three-dimensional structure diagram of the buffer substrate part of the present invention;

[0029] Figure 6 Schematic three-dimensional structure diagram of the moisture absorption box part of the present invention;

[0030] Figure 7 Schematic three-dimensional structure diagram of the moisture absorption box part of the present invention from another angle.

[0031] In the figure: 1 grid connection cabinet, 2 cabinet door, 3 bolt, 4 bolt seat, 5 mounting flat iron, 6 circuit breaker, 7 auxiliary switch box, 8 driving gear, 9 driven gear, 10 driving bevel gear, 11 driven bevel gear, 12 threaded rod, 13 threaded sleeve, 14 limiting slide bar, 15 buffer substrate, 16 mating substrate, 17 telescopic rod, 18 buffer spring, 19 conductive slider, 20 A terminal, 21 B terminal, 22 circulation port, 23 moisture absorption box, 24 moisture-proof fan, 25 limiting track, 26 silica gel box, 27 mating telescopic rod, 28 tension spring, 29 push button switch. Specific embodiments

[0032] The technical solutions of this patent will be further described in detail below in conjunction with specific embodiments.

[0033] As Figures 1-7 shown, the present invention provides a technical solution:

[0034] A photovoltaic new energy grid connection cabinet, comprising:

[0035] The grid connection cabinet 1, on which a cabinet door 2 is hinged, a bolt 3 is fixedly connected to the cabinet door 2, a bolt seat 4 is fixedly connected to the side wall of the grid connection cabinet 1, two mounting flat irons 5 are fixedly connected inside the grid connection cabinet 1, a circuit breaker 6 is installed on the mounting flat iron 5, an auxiliary switch box 7 is arranged on one side of the circuit breaker 6, the auxiliary switch box 7 is fixedly connected to the inner wall of the grid connection cabinet 1, an anti-islanding mechanism is arranged inside the auxiliary switch box 7, various electronic components can be installed on the mounting flat iron 5 in the grid connection cabinet 1, the circuit breaker 6 is necessary in the grid connection cabinet 1, and other electronic components are not drawn in the illustration. The cabinet door 2 of the grid connection cabinet 1 is locked through the bolt 3 and the bolt seat 4;

[0036] The anti-islanding mechanism includes a driving gear 8 and a driven gear 9 which are rotatably connected to the side wall of the auxiliary switch box 7. The rotating shaft of the toggle lever on the circuit breaker 6 passes through the circuit breaker 6 and the auxiliary switch box 7 and is coaxially fixedly connected to the driving gear 8. The driving gear 8 and the driven gear 9 are meshed with each other. The driven gear 9 is coaxially fixedly connected with a driving bevel gear 10. A driven bevel gear 11 is rotatably connected to the inner wall of the auxiliary switch box 7. The driving bevel gear 10 and the driven bevel gear 11 are meshed with each other. The driven bevel gear 11 is coaxially fixedly connected with a threaded rod 12. A threaded sleeve 13 is threadedly connected to the threaded rod 12. The auxiliary switch box 7 corresponds to one side of the driven bevel gear 11. Two limiting slide bars 14 are fixedly connected to the inner wall of the auxiliary switch box 7, and the limiting slide bar 14 passes through the threaded sleeve 13 and is slidably connected thereto. A buffer substrate 15 is fixedly connected to one side of the threaded sleeve 13, and a matching substrate 16 is slidably connected to the buffer substrate 15. A telescopic rod 17 and a buffer spring 18 are fixedly connected to the buffer substrate 15, and the buffer spring 18 is sleeved on the outside of the telescopic rod 17. The output end of the telescopic rod 17 and the end of the buffer spring 18 away from the buffer substrate 15 are fixedly connected to the matching substrate 16, and the matching substrate 16 is fixedly connected to the side wall of the auxiliary switch box 7. There are A terminal 20 and B terminal 21, A terminal 20 and B terminal 21 are matched with conductive slider 19, the state of toggle lever of circuit breaker 6 can directly affect the driving gear 8 in auxiliary switch box 7, but when the toggle lever is rotated, the driving gear 8 rotates, the driving gear 8 and the driven gear 9 meshing therewith have relatively large numbers of teeth, and a small angle rotation of the driving gear 8 will cause the driven gear 9 to rotate a large angle, then the driving bevel gear 10 coaxially fixedly connected to the driven gear 9 will rotate, and the driven bevel gear 11 meshing with the driving bevel gear 10 will rotate synchronously, and the driven bevel gear 11 coaxially fixedly connected to the driving bevel gear 10 will rotate synchronously. The threaded rod 12 will also rotate, and the threaded sleeve 13 on the threaded rod 12 will move along the axial direction of the threaded rod 12. The limiting slide rod 14 is slidably connected with the threaded sleeve 13, which can ensure that the threaded sleeve 13 does not rotate with the rotation of the threaded rod 12, and plays a limiting role. When the threaded sleeve 13 moves down, the buffer substrate 15 will move down accordingly. A telescopic rod 17 and a buffer spring 18 are arranged between the buffer substrate 15 and the matching substrate 16 to provide elastic buffering for the conductive slider 19 on the matching substrate 16. Both ends of the conductive slider 19 are arc-shaped, which is more convenient for fitting with the A terminal 20 and the B terminal 21;

[0037] Terminal A 20 and terminal B 21 are both connected in series in the switch circuit of the socket 4. Terminal A 20 and terminal B 21 are disconnected. When the conductive slider 19 moves to the side close to the driven bevel gear 11, terminal A 20 and terminal B 21 are connected. At this time, when the circuit breaker 6 is in the open state, the cabinet door 2 can be opened normally. When the circuit breaker 6 is in the closed state, it means that the photovoltaic system is operating in connection with the public power grid. At this time, the conductive slider 19 is far away from terminal A 20 and terminal B 21, and the socket 4 is locked, and the cabinet door 2 cannot be opened. This greatly enhances the safety of the grid-connected cabinet 1 and avoids accidental electric shock or other dangerous situations. By means of physical isolation, the occurrence of the islanding effect is prevented, and the safety and stability of the entire system are improved. Even if other anti-islanding technologies fail, this mechanical protection measure can provide an additional layer of protection, and this design is relatively simple and direct, easy to implement and verify its effectiveness, reducing problems that may occur in complex electronic detection or control systems;

[0038] A moisture-proof mechanism is provided in the grid-connected cabinet 1;

[0039] The moisture-proof mechanism includes circulation ports 22 opened on both sides of the grid-connected cabinet 1. Moisture absorption boxes 23 are fixedly connected to the inner walls on both sides of the grid-connected cabinet 1. A moisture-proof fan 24 is arranged inside the moisture absorption box 23. Limiting tracks 25 are fixedly connected to the inner walls on both sides of the moisture absorption box 23. A silica gel box 26 is slidably connected between the two limiting tracks 25. Silica gel particles are filled in the silica gel box 26. Two cooperating telescopic rods 27 are fixedly connected to the inner top of the moisture absorption box 23. A tension spring 28 is sleeved outside the cooperating telescopic rod 27. The output ends of the two cooperating telescopic rods 27 are fixedly connected to the silica gel box 26. The bottom of the tension spring 28 abuts against the silica gel box 26. A push button switch 29 is arranged at the inner bottom of the silica gel box 26. The push button switch 29 is electrically connected to the two moisture-proof fans 24 on the corresponding side. When encountering a humid environment, the silica gel particles in the silica gel box 26 can adsorb the moisture in the grid-connected cabinet 1. The silica gel particles absorb water and gain weight, and the whole silica gel box 26 will move down between the two limiting tracks 25. The cooperating telescopic rod 27 and the tension spring 28 are stretched. When the silica gel particles in the silica gel box 26 are fully saturated with water, the silica gel box 26 is in the lowest position, and the silica gel box 26 contacts and triggers the push button switch 29. After the push button switch 29 is triggered, the moisture-proof fan 24 is turned on to accelerate the air circulation in the grid-connected cabinet 1. After the humid environment disappears, due to the heat generated by various electronic components in the grid-connected cabinet 1 flowing with the air flow, the silica gel particles in the silica gel box 26 can be dried and thus restored to the initial state, and the silica gel box 26 will rise again.

[0040] The working principle of the present invention is as follows:

[0041] A variety of electronic components can be installed on the mounting flat iron 5 in the grid-connected cabinet 1. The circuit breaker 6 is necessary in the grid-connected cabinet 1, and other electronic components are not shown in the legend. The cabinet door 2 of the grid-connected cabinet 1 is locked through the bolt 3 and the bolt seat 4;

[0042] The state of the toggle lever of the circuit breaker 6 can directly affect the driving gear 8 in the auxiliary switch box 7. When the toggle lever rotates, the driving gear 8 rotates. The number of teeth of the driving gear 8 and the driven gear 9 meshing with it is relatively large. A small-angle rotation of the driving gear 8 will cause the driven gear 9 to rotate at a large angle. Then, the driving bevel gear 10 fixedly connected coaxially with the driven gear 9 will rotate, and the driven bevel gear 11 meshing with the driving bevel gear 10 will rotate synchronously. The threaded rod 12 fixedly connected coaxially with the driven bevel gear 11 will also rotate, and the threaded sleeve 13 on the threaded rod 12 will move along the axial direction of the threaded rod 12. The limit slide rod 14 is slidably connected to the threaded sleeve 13, which can ensure that the threaded sleeve 13 does not rotate with the threaded rod 12 and plays a limiting role. When the threaded sleeve 13 moves downward, the buffer substrate 15 will move downward accordingly. The telescopic rod 17 and the buffer spring 18 are arranged between the buffer substrate 15 and the mating substrate 16 to provide elastic buffering for the conductive slider 19 on the mating substrate 16. Both ends of the conductive slider 19 are designed in an arc shape, which is more convenient for fitting with the A terminal 20 and the B terminal 21;

[0043] Both the A terminal 20 and the B terminal 21 are connected in series in the switch circuit of the bolt seat 4. The A terminal 20 and the B terminal 21 are disconnected. When the conductive slider 19 moves to the side close to the driven bevel gear 11, the A terminal 20 and the B terminal 21 are connected. At this time, when the circuit breaker 6 is in the open state, the cabinet door 2 can be opened normally. When the circuit breaker 6 is in the closed state, it means that the photovoltaic system is connected to and operating with the public grid. At this time, the conductive slider 19 is far away from the A terminal 20 and the B terminal 21, and the bolt seat 4 is locked, and the cabinet door 2 cannot be opened. This greatly enhances the safety of the grid-connected cabinet 1, avoids accidental electric shock or other dangerous situations, prevents the occurrence of the islanding effect through physical isolation, and improves the safety and stability of the entire system. Even if other anti-islanding technologies fail, this mechanical protection measure can provide an additional layer of protection, and this design is relatively simple and direct, easy to implement and verify its effectiveness, and reduces the problems that may occur in complex electronic detection or control systems;

[0044] When encountering a humid environment, the silica gel particles in the silica gel box 26 can adsorb the moisture in the grid-connected cabinet 1. The silica gel particles absorb water and gain weight, and the entire silica gel box 26 will move downward between the two limiting tracks 25, causing the telescopic rod 27 and the tension spring 28 to be stretched. When the silica gel particles in the silica gel box 26 are fully saturated with water, the silica gel box 26 is at the lowest position, touching and triggering the push-button switch 29. After the push-button switch 29 is triggered, the moisture-proof fan 24 is turned on to accelerate the air circulation in the grid-connected cabinet 1. After the humid environment disappears, since the heat generated by various electronic components in the grid-connected cabinet 1 during operation flows with the air current, the silica gel particles in the silica gel box 26 can be dried and thus return to the initial state, and the silica gel box 26 will rise again.

[0045] The above has described the preferred embodiments of the present invention in detail, but the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the gist of the present invention.

Claims

1. A grid-connected cabinet for photovoltaic new energy, characterized in that, include: A power cabinet (1), wherein a cabinet door (2) is hingedly connected to the cabinet door (2), a latch (3) is fixedly connected to the cabinet door (2), a latch seat (4) is fixedly connected to the side wall of the power cabinet (1), two installation flat irons (5) are fixedly connected inside the power cabinet (1), a circuit breaker (6) is installed on the installation flat iron (5), an auxiliary switch box (7) is arranged on one side of the circuit breaker (6), the auxiliary switch box (7) is fixedly connected to the inner wall of the power cabinet (1), and an anti-islanding mechanism is arranged inside the auxiliary switch box (7); The anti-islanding mechanism comprises a driving gear (8) and a driven gear (9) rotatably connected to the side wall of the auxiliary switch box (7); the rotating shaft of the toggle lever on the circuit breaker (6) passes through the circuit breaker (6) and the auxiliary switch box (7) and is coaxially fixedly connected to the driving gear (8); the driving gear (8) and the driven gear (9) are meshed with each other; the driven gear (9) is coaxially fixedly connected to a driving bevel gear (10); a driven bevel gear (11) is rotatably connected to the inner wall of the auxiliary switch box (7); the driving bevel gear (10) and the driven bevel gear (11) are meshed with each other; the driven bevel gear (11) is coaxially fixedly connected to a threaded rod (12); a threaded sleeve (13) is threadedly connected to the threaded rod (12); two limit slide bars (14) are fixedly connected to the inner wall of the auxiliary switch box (7) on the side corresponding to the driven bevel gear (11); the limit slide bars (14) penetrates the threaded sleeve (13) and is slidably connected thereto, a buffer substrate (15) is fixedly connected to one side of the threaded sleeve (13), a matching substrate (16) is slidably connected to the buffer substrate (15), a telescopic rod (17) and a buffer spring (18) are fixedly connected to the buffer substrate (15), the buffer spring (18) is sleeved on the outside of the telescopic rod (17), the output end of the telescopic rod (17) and the end of the buffer spring (18) away from the buffer substrate (15) are both fixedly connected to the matching substrate (16), the matching substrate (16) is fixedly connected to a conductive slider (19) on the side away from the buffer substrate (15), and the side walls of the auxiliary switch box (7) are respectively fixedly connected to an A wiring terminal (20) and a B wiring terminal (21), and the A wiring terminal (20) and the B wiring terminal (21) are matched with the conductive slider (19); A moisture-proof mechanism is provided in the grid-connected cabinet (1).

2. The grid-connected cabinet for photovoltaic new energy according to claim 1, characterized in that: The moisture-proof mechanism comprises flow ports (22) opened on both sides of the grid cabinet (1), and moisture absorption boxes (23) are fixedly connected to the inner walls on both sides of the grid cabinet (1), and the moisture absorption box (23) has a moisture-proof fan (24) built in it.

3. A photovoltaic new energy grid-connected cabinet according to claim 2, characterized in that: The inner walls on both sides of the moisture absorption box (23) are fixedly connected to limiting rails (25), and a silica gel box (26) is slidably connected between the two limiting rails (25), and the silica gel box (26) is filled with silica gel particles.

4. The grid-connected cabinet for photovoltaic new energy according to claim 3, characterized in that: Two cooperating telescopic rods (27) are fixedly connected to the inner top of the moisture absorption box (23). A tension spring (28) is sleeved outside the cooperating telescopic rods (27). The output ends of the two cooperating telescopic rods (27) are fixedly connected to the silica gel box (26), and the bottom of the tension spring (28) abuts against the silica gel box (26).

5. A grid-connected cabinet for photovoltaic new energy according to claim 4, characterized in that: A push button switch (29) is arranged at the inner bottom of the silica gel box (26), and the push button switch (29) is electrically connected to two moisture-proof fans (24) on the corresponding side.

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