A reverse current protection photovoltaic grid-connected box

Abstract

The utility model discloses a photovoltaic grid-connected box of anti -reverse flow protection, including photovoltaic grid-connected box, be equipped with three installation groove body in photovoltaic grid-connected box, including left installation groove, right installation groove and lower installation groove, left installation groove is equipped with first anti -reverse flow device, second anti -reverse flow device and intelligent circuit breaker, right installation groove is equipped with current transformer, lower installation groove is equipped with photovoltaic isolation knife switch, surge protector and photovoltaic grid-connected switch, and the rear side of photovoltaic grid-connected box is equipped with air -cooled fin. The utility model discloses through first anti -reverse flow device, second anti -reverse flow device in photovoltaic grid-connected box, the current, voltage etc. of demarcation point's data are measured, and the real -time power value, power direction are calculated, whether " reverse flow " exists is detected in real time, if the reverse flow can carry out real -time regulation control to photovoltaic control equipment's output, prevent electric energy backflow to the electric network, the rear side of photovoltaic grid-connected box adds air -cooled fin, can realize better heat dissipation effect, novel structure, strong practicality, is fit for promoting.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic power generation technology, and more specifically to a photovoltaic grid-connected box with anti-reverse current protection. Background Technology

[0002] Distributed photovoltaic (PV) systems, also known as decentralized small-scale photovoltaic (PV) power generation systems, are characterized by solar panels installed on the roofs of homes or factories. The associated distributed PV grid-connected boxes are crucial equipment integrating power conversion, protection, monitoring, and communication functions. Their role is to ensure the safe and efficient connection of the PV system to the grid, strictly adhering to relevant standards and specifications. In existing distributed PV systems, some grid-connected boxes lack reverse current protection, making them prone to grid overload and instability. Furthermore, reverse current can easily damage the equipment, directly impacting its lifespan. Additionally, existing grid-connected boxes have poor heat dissipation, easily leading to malfunctions of core electrical components due to overheating, affecting power supply stability. Therefore, providing good ventilation and heat dissipation for the internal core electrical components can effectively extend their lifespan. To address these issues, the inventors propose a reverse current protection PV grid-connected box. By installing a reverse current protection device inside the box, reverse current can be prevented, ensuring normal equipment operation and grid stability. Simultaneously, an external heat dissipation device provides excellent heat dissipation, preventing malfunctions of the internal core electrical components due to poor heat dissipation.

[0003] To ensure effective heat dissipation of the grid-connected box and prevent internal components from burning out due to overheating, Chinese patent (authorization announcement number: CN212850414U) discloses an anti-reverse current solar photovoltaic power supply device. This utility model includes a base, a water tank fixedly connected to the center of the bottom of the base's inner cavity, a cooler fixedly connected to the bottom of the water tank's inner cavity, a conveying device on the right side of the water tank, and a power supply device body fixedly connected to the top of the base. This utility model achieves excellent heat dissipation through the coordinated arrangement of the base, water tank, cooler, conveying device, power supply device body, fixing plate, shell, motor, fan blades, fixing block, filter plate, cooling pipe, and bend pipe. During long-term use, the anti-reverse current solar photovoltaic power supply device can dissipate heat promptly, preventing internal components from burning out, thus improving its practicality.

[0004] This solution still has some shortcomings in application. Because the photovoltaic grid-connected box houses reverse power protection devices, transformers, input switches, surge protectors, and photovoltaic disconnect switches, it needs to be kept dry inside to prevent short circuits. Good heat dissipation is also crucial to avoid equipment damage due to overheating. Furthermore, the inverter box requires anti-reverse current protection to enhance grid security and protect critical equipment and the normal operation of the grid. Therefore, the structure of the photovoltaic grid-connected inverter box needs improvement to overcome these limitations, making it more suitable for the requirements and more practical. Utility Model Content

[0005] The present invention discloses a photovoltaic grid-connected box with anti-reverse current protection, the main purpose of which is to overcome the above-mentioned deficiencies and shortcomings of the existing technology.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A photovoltaic grid-connected box with anti-reverse current protection includes a photovoltaic grid-connected box with three mounting slots inside, including a left mounting slot, a right mounting slot, and a lower mounting slot. The left mounting slot is equipped with a first anti-reverse current device, a second anti-reverse current device, and a smart circuit breaker. The right mounting slot is equipped with a current transformer. The lower mounting slot is equipped with a photovoltaic isolating knife switch, a surge protector, and a photovoltaic grid-connected switch. A wind-cooled heat sink is installed on the rear side of the photovoltaic grid-connected box.

[0008] Furthermore, the photovoltaic grid-connected box is equipped with several inverters on its outside. One end of each inverter is connected to the second anti-reverse current device via RS485 communication, and the other end is connected to the external photovoltaic panel.

[0009] Furthermore, the photovoltaic grid-connected box is equipped with a door, and an observation window is provided on the upper part of the door.

[0010] Furthermore, a control panel is provided on the outside of the first anti-backflow device. The control panel includes a display screen and buttons, and the display screen is set to correspond to the observation window.

[0011] Furthermore, the models of the first anti-backflow device and the second anti-backflow device are HZ-6580H and HZ6080, respectively.

[0012] Furthermore, the air-cooled heat sink is made of pure copper.

[0013] Furthermore, the photovoltaic grid-connected box is equipped with dustproof and heat dissipation vents on both the left and right sides, and a cooling fan is installed on the top of the photovoltaic grid-connected box.

[0014] As can be seen from the above description of this utility model, compared with the prior art, the advantages of this utility model are as follows:

[0015] This invention first installs a first anti-reverse current device, a second anti-reverse current device, and a smart circuit breaker in the left mounting slot within the photovoltaic grid-connected box. The first and second anti-reverse current devices are models HZ-6580H and HZ6080, respectively. This setup detects current, voltage, and other data at the boundary point, calculates real-time power values ​​and power direction, and monitors the presence of "reverse current" at the grid connection point. If reverse current is detected, real-time communication with the inverter adjusts the output of the photovoltaic control equipment, achieving a "dynamic anti-reverse current" effect. Next, the installation of the anti-reverse current device prevents the photovoltaic power station from transmitting excessive current to the grid. The photovoltaic power station generates more electricity, avoiding grid overload and instability, which helps maintain the overall stability and security of the grid. When the electricity generated by the photovoltaic power station exceeds the grid's demand, the anti-reverse flow device can prevent electricity from flowing back into the grid, avoiding energy waste and helping to improve the reliability and stability of the photovoltaic power station system. Finally, the top of the photovoltaic grid-connected box is equipped with a cooling fan for conventional heat dissipation, and the rear of the photovoltaic grid-connected box is equipped with air-cooled heat sinks, which can conduct the hot air inside the box to the outside more quickly, achieving better heat dissipation. This utility model has a novel structure, ingenious design, anti-reverse flow function and good heat dissipation effect, and is suitable for promotion. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure connecting the photovoltaic module array, inverter, and photovoltaic grid-connected box of this utility model.

[0017] Figure 2 This is a front view structural diagram of the photovoltaic grid-connected box of this utility model.

[0018] Figure 3 This is a bottom view schematic diagram of the photovoltaic structure of this utility model. Detailed Implementation

[0019] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0020] like Figures 1 to 3 As shown, a photovoltaic grid-connected box with anti-reverse current protection includes a photovoltaic grid-connected box 1. The photovoltaic grid-connected box 1 has three mounting slots, including a left mounting slot 2, a right mounting slot 3, and a lower mounting slot 4. The left mounting slot 2 is equipped with a first anti-reverse current device 21, a second anti-reverse current device 22, and a smart circuit breaker 23. The right mounting slot 3 is equipped with a current transformer 31. The lower mounting slot 4 is equipped with a photovoltaic isolating knife switch 41, a surge protector 42, and a photovoltaic grid-connected switch 43. The rear side of the photovoltaic grid-connected box 1 is equipped with a wind-cooled heat sink 5.

[0021] Furthermore, a number of inverters 6 are provided on the outside of the photovoltaic grid-connected box 1. One end of the inverter 6 is connected to the second anti-reverse current device 22 via RS485 communication, and the other end is connected to the external photovoltaic panel.

[0022] Furthermore, the photovoltaic grid-connected box 1 is provided with a door 7, and an observation window 8 is provided on the upper part of the door 7.

[0023] Furthermore, the first anti-backflow device 21 is provided with a control panel on its outer side. The control panel includes a display screen 211 and buttons 212. The display screen 211 is configured to correspond to the observation window 8.

[0024] Furthermore, the first anti-backflow device 21 and the second anti-backflow device 22 are model numbers HZ-6580H and HZ6080, respectively.

[0025] Furthermore, the air-cooled heat sink 5 is made of pure copper.

[0026] Furthermore, the photovoltaic grid-connected box 1 is provided with dustproof heat dissipation vents 9 on the left and right sides, and a cooling fan 10 is installed on the top of the photovoltaic grid-connected box 1.

[0027] Example: First, the first anti-reverse current device 21 and the second anti-reverse current device 22 in the photovoltaic grid-connected box 1 are connected to the inverter 6 via RS485 communication. The photovoltaic grid-connected box 1 and the inverter 6 are respectively installed between the output end of the photovoltaic power generation system and the grid connection point. Then, power generation is started, and the inverter 6 converts the DC power from the photovoltaic modules into AC power and connects it to the grid to supply local loads. During operation, the first anti-reverse current device 21 and the second anti-reverse current device 22 in the left mounting slot 2 detect the current, voltage, and other data at the boundary point and calculate... The system calculates the real-time power value and power direction, and detects in real-time whether there is "backflow" at the grid connection point, i.e. whether there is current to be fed into the grid (transformer). If backflow exists, the output of the photovoltaic control equipment is adjusted and controlled in real-time through real-time communication between the first anti-backflow device 21, the second anti-backflow device 22 and the inverter 6. Finally, during operation, the system uses the cooling fan 10 on the top of the photovoltaic grid-connected box 1 for conventional heat dissipation, and the air-cooled heat sink 5 on the rear side of the photovoltaic grid-connected box 1 to exhaust the hot air inside the box, thereby improving the heat dissipation effect of the photovoltaic grid-connected box 1.

[0028] As can be seen from the above description of this utility model, compared with the prior art, the advantages of this utility model are as follows:

[0029] This invention first installs a first anti-reverse current device, a second anti-reverse current device, and a smart circuit breaker in the left mounting slot within the photovoltaic grid-connected box. The first and second anti-reverse current devices are models HZ-6580H and HZ6080, respectively. This setup detects current, voltage, and other data at the boundary point, calculates real-time power values ​​and power direction, and monitors the presence of "reverse current" at the grid connection point. If reverse current is detected, real-time communication with the inverter adjusts the output of the photovoltaic control equipment, achieving a "dynamic anti-reverse current" effect. Next, the installation of the anti-reverse current device prevents the photovoltaic power station from transmitting excessive current to the grid. The photovoltaic power station generates more electricity, avoiding grid overload and instability, which helps maintain the overall stability and security of the grid. When the electricity generated by the photovoltaic power station exceeds the grid's demand, the anti-reverse flow device can prevent electricity from flowing back into the grid, avoiding energy waste and helping to improve the reliability and stability of the photovoltaic power station system. Finally, the top of the photovoltaic grid-connected box is equipped with a cooling fan for conventional heat dissipation, and the rear of the photovoltaic grid-connected box is equipped with air-cooled heat sinks, which can conduct the hot air inside the box to the outside more quickly, achieving better heat dissipation. This utility model has a novel structure, ingenious design, anti-reverse flow function and good heat dissipation effect, and is suitable for promotion.

[0030] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial improvements made to this utility model using this concept should be considered as infringing on the protection scope of this utility model.

Claims

1. A photovoltaic grid-connected box with anti-reverse current protection, characterized in that: The photovoltaic grid-connected box includes three mounting slots: a left mounting slot, a right mounting slot, and a lower mounting slot. The left mounting slot is equipped with a first anti-reverse current device, a second anti-reverse current device, and a smart circuit breaker. The right mounting slot is equipped with a current transformer. The lower mounting slot is equipped with a photovoltaic isolating knife switch, a surge protector, and a photovoltaic grid-connected switch. The rear of the photovoltaic grid-connected box is equipped with air-cooled heat sinks.

2. A photovoltaic grid-connected box with anti-reverse current protection according to claim 1, characterized in that: Several inverters are installed on the outside of the photovoltaic grid-connected box. One end of the inverter is connected to the second anti-reverse current device via RS485 communication, and the other end is connected to the external photovoltaic panel.

3. A photovoltaic grid-connected box with anti-reverse current protection according to claim 1, characterized in that: The photovoltaic grid-connected box is equipped with a door, and an observation window is provided on the upper part of the door.

4. A photovoltaic grid-connected box with anti-reverse current protection according to claim 3, characterized in that: The first anti-backflow device is equipped with a control panel on its outer side. The control panel includes a display screen and buttons, and the display screen is set to correspond to the observation window.

5. A photovoltaic grid-connected box with anti-reverse current protection according to claim 1, characterized in that: The first anti-backflow device and the second anti-backflow device are model numbers HZ-6580H and HZ6080, respectively.

6. A photovoltaic grid-connected box with anti-reverse current protection according to claim 1, characterized in that: The air-cooled heat sink is made of pure copper.

7. A photovoltaic grid-connected box with anti-reverse current protection according to claim 1, characterized in that: The photovoltaic grid-connected box is equipped with dustproof and heat dissipation vents on both the left and right sides, and a cooling fan is installed on the top of the photovoltaic grid-connected box.

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