An intelligent photovoltaic grid-connected box with anti-reverse function
By designing an intelligent monitoring module with anti-reverse function in the photovoltaic grid-connected box, combined with anti-reverse diode and surge protector, the problem of overheating and unreasonable layout of the photovoltaic grid-connected box due to closed isolation is solved, and detailed monitoring and alarm of the photovoltaic power generation system is achieved, reducing energy consumption and improving the safety and stability of the system.
Patent Information
- Application Number
- CN202421939324.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-12
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-08-12
AI Technical Summary
During use, existing photovoltaic grid-connected boxes are prone to overheating and damage caused by closure and isolation, and unreasonable layout leads to confusion of lines, resulting in waste of cables and copper flasks, increasing costs, and are not conducive to later maintenance and maintenance.
Design an intelligent photovoltaic grid-connected box with anti-reverse function, which is equipped with DC plastic case circuit breaker, DC fuse, intelligent monitoring module, Hall sensor, anti-reverse diode and surge protector. Real-time monitoring and alarm are realized through Hall sensor and intelligent monitoring module, prevent current inversion, reduce energy consumption, and optimize the utilization of cables and copper rows through reasonable layout.
It realizes detailed measurement, monitoring, alarm, convergence and fault positioning functions of the photovoltaic power generation system, prevents damage to solar cell modules, reduces energy consumption, improves the safety and stability of the system, and facilitates later maintenance and maintenance.
Smart Images
Figure CN222720905U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a power distribution system, in particular to an intelligent photovoltaic grid-connected box with an anti-reverse function. Background Art
[0002] Photovoltaic power generation is increasingly being used because it is a renewable and clean energy source. The grid-connected boxes used are generally installed outdoors. The electronic components in the grid-connected boxes cannot be exposed to water. If a simple closed isolation method is used, the internal grid-connected box will be overheated and damaged. In actual use, it has great limitations and a short service life. In addition, the grid-connected box has multiple inputs, and an unreasonable layout can easily cause line confusion, resulting in waste of cables and copper busbars, increasing costs, and is not conducive to later maintenance and overhaul. Summary of the invention
[0003] In order to solve the above technical problems, the utility model is an intelligent photovoltaic grid-connected box with anti-reverse function, and its technical solution is:
[0004] It comprises a box body, wherein a mounting base plate is provided in the box body, and a DC molded case circuit breaker, a DC fuse, an intelligent monitoring module, a Hall sensor, an anti-reverse diode and a surge protector are mounted on the base plate. The DC fuses are several, and are divided into a positive photovoltaic DC special fuse and a negative photovoltaic DC special fuse. The electrical output end of the photovoltaic string is connected to the input end of the Hall sensor, and the output end of the Hall sensor is respectively connected to the positive photovoltaic DC special fuse and the negative photovoltaic DC special fuse;
[0005] The negative photovoltaic DC fuse is set at the bottom of the box, and is connected to the negative connection copper bar and then connected to the DC circuit breaker; the positive photovoltaic DC fuse is set in the middle of the box, and is connected to the positive connection copper bar through the anti-reverse diode and then connected to the DC circuit breaker;
[0006] The DC circuit breaker is arranged on the right side of the positive photovoltaic DC special fuse, and a heat sink is arranged above the DC circuit breaker; a special lightning arrester is arranged on the left side of the negative photovoltaic DC special fuse, and the special lightning arrester is connected to the positive connection copper bar and the negative connection copper bar through connecting wires and then connected to the DC circuit breaker;
[0007] The intelligent monitoring module is arranged at the upper end of the positive photovoltaic DC dedicated fuse, and the intelligent monitoring module is respectively connected with the Hall sensor, the alarm outside the box and the dedicated lightning arrester signal.
[0008] Furthermore, the number of positive photovoltaic DC dedicated fuses and negative photovoltaic DC dedicated fuses is the same.
[0009] Furthermore, a customized radiator is installed on the top of the circuit breaker to effectively reduce the temperature rise of the circuit breaker.
[0010] The beneficial effects of the utility model are as follows: the utility model is an intelligent photovoltaic grid-connected box with anti-reverse function. The electric energy emitted by each group of photovoltaic strings first passes through the Hall sensor and then is connected to the DC special fuse corresponding to the positive and negative poles. The Hall sensor can transmit the collected information to the intelligent monitoring module in real time. After being summarized and analyzed by the intelligent monitoring module, it can provide detailed measurement, monitoring, alarm, confluence, fault location and other information functions for the power generation system of the power station, and can monitor the solar panel array fault, transmission cable fault, lightning arrester fault state and other functions, and has a communication interface, which is convenient for the use of the monitoring system. The utility model can provide detailed measurement, monitoring, alarm, confluence, fault location and other information functions for the power generation system of the power station by configuring the intelligent monitoring module, the Hall sensor, and the anti-reverse diode; it can prevent the current of the battery from being reversed to the component or array when the solar cell component or array is not generating electricity, reduce energy consumption and avoid heating or even damage of the component or array, and the layout is reasonable, the cable and copper bus are fully utilized, and it is also convenient for maintenance and repair in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 This is a schematic diagram of the appearance box structure of the utility model;
[0012] Figure 2 It is a schematic diagram of the structure of the utility model;
[0013] Figure 3 This is the circuit diagram of the utility model;
[0014] As shown in the figure, 1 is the cabinet, 2 is the anti-reverse diode, 3 is the intelligent monitoring module, 4 is the positive photovoltaic DC special fuse, 5 is the Hall sensor, 6 is the special lightning arrester, 7 is the positive connecting copper bus, 8 is the radiator, 9 is the DC circuit breaker, 10 is the negative connecting copper bus, 11 is the negative photovoltaic DC special fuse, 12 is the DC fuse, 13 is the photovoltaic array 1, 14 is the photovoltaic array 2, 15 is the photovoltaic array 19, 16 is the photovoltaic array 20, and 17 is the output. DETAILED DESCRIPTION
[0015] As shown in the figure, the utility model is an intelligent photovoltaic grid-connected box with anti-reverse function, including a box body, in which an anti-reverse diode 2, an intelligent monitoring module 3, a Hall sensor 5, a special lightning arrester 6, a connecting copper bar (including a positive connecting copper bar 7 and a negative connecting copper bar 10), a radiator 8, a DC circuit breaker 9, a surge protector and a DC fuse 12 (including a positive photovoltaic DC special fuse 4 and a negative photovoltaic DC special fuse 11) are arranged.
[0016] Box 1 is a wall-mounted box. The plate should be made of high-quality steel plate with a thickness of no less than 1.5mm. The paint and sealing materials on the surface of the box should be corrosion-resistant and anti-oxidation. The protection level reaches IP65. It is installed next to the outdoor solar photovoltaic array and has waterproof, dustproof, rust-proof and temperature-insulating functions.
[0017] The surge protector is installed between the fuse and the circuit breaker and connected to the copper busbar. Its function is to provide lightning protection and overcurrent protection. Especially when facing the impact of induced lightning and direct lightning or other instantaneous overvoltage surges, the surge protector, as a device, provides lightning protection for solar power generation and ensures the safe and stable operation of the photovoltaic power generation system.
[0018] Each photovoltaic string group (including photovoltaic arrays 1-13, photovoltaic arrays 2-14, ..., photovoltaic arrays 19-15 and photovoltaic arrays 20-16) has separate positive and negative photovoltaic DC fuses. The output DC circuit breaker in the box selects the photovoltaic DC circuit breaker 9. The upper end of the circuit breaker is equipped with a customized dressing radiator to effectively reduce the heating of the circuit breaker. The positive pole of the DC output busbar is connected to the ground, the negative pole is connected to the ground, and the positive and negative poles are equipped with photovoltaic lightning arresters 6 to effectively prevent lightning damage.
[0019] The intelligent monitoring module, in conjunction with the Hall sensor, can provide detailed measurement, monitoring, alarm, confluence, fault location and other information functions for the power generation system of the power station; it has the functions of monitoring the fault of the solar panel array, the fault of the transmission cable, the fault status of the lightning arrester, etc., and has a communication interface to facilitate the use of the monitoring system. It can collect the current, voltage, output current, voltage, power of the junction box and the status of the lightning arrester of each photovoltaic string, and can automatically detect the current or voltage of each photovoltaic string to determine the abnormal state and issue a fault alarm signal, which is sent to the indoor data collector of the integrated inverter room through the RS485 interface using the standard communication protocol.
[0020] The anti-reverse diode can prevent the battery current from flowing back to the solar cell module or array when the solar cell module or array is not generating electricity, thereby reducing energy consumption and preventing the module or array from heating up or even being damaged.
[0021] The working process of this utility model:
[0022] ① The electric energy from each photovoltaic string first passes through the Hall sensor and then connects to the DC fuses corresponding to the positive and negative poles. The Hall sensor can transmit the collected information to the intelligent monitoring module in real time. After being summarized and analyzed by the intelligent monitoring module, it can provide detailed measurement, monitoring, alarm, confluence, fault location and other information functions for the power generation system of the power station. It can monitor the solar panel array fault, transmission cable fault, lightning arrester fault status and other functions, and has a communication interface to facilitate the use of the monitoring system. It can collect the current, voltage, output current, voltage, power of the junction box and the status of the lightning arrester of each photovoltaic string, and can automatically detect the current or voltage of each photovoltaic string to determine the abnormal state and issue a fault alarm signal, which is sent to the indoor data collector of the integrated inverter room through the RS485 interface using the standard communication protocol.
[0023] ② After the positive current passes through the positive photovoltaic DC dedicated fuse, it passes through the anti-reverse diode. The anti-reverse diode can prevent the solar cell module or array from flowing back to the module or array when it is not generating electricity, thereby reducing energy consumption and avoiding heating or even damage to the module or array.
[0024] ③The current is collected through the connecting copper busbar and enters the photovoltaic dedicated DC circuit breaker. To prevent the circuit breaker from heating up, a customized radiator is installed on the top of the circuit breaker to effectively reduce the temperature rise of the circuit breaker.
[0025] ④ The positive pole of the DC output 17 busbar is connected to the ground, the negative pole is connected to the ground, and the positive and negative poles are equipped with photovoltaic-specific lightning arresters to effectively prevent lightning damage.
[0026] The product names, models and quantities used in this example are as follows:
[0027] The above is an example of the best implementation method of this application, and the parts not described in detail are common knowledge of ordinary technicians in this field. The protection scope of this application shall be based on the content of the claims, and any equivalent transformation based on the technical enlightenment of this application is also within the protection scope of this application.
Claims
1. An intelligent photovoltaic grid-connected box with anti-reverse function, comprising a box body, characterized in that: The box is provided with an installation base plate, on which a DC molded case circuit breaker, a DC fuse, an intelligent monitoring module, a Hall sensor, an anti-reverse diode and a surge protector are installed. The DC fuses are several, divided into a positive photovoltaic DC special fuse and a negative photovoltaic DC special fuse. The electrical output end of the photovoltaic string is connected to the input end of the Hall sensor, and the output end of the Hall sensor is respectively connected to the positive photovoltaic DC special fuse and the negative photovoltaic DC special fuse; The negative photovoltaic DC fuse is set at the bottom of the box, and is connected to the negative connection copper bar and then connected to the DC circuit breaker; the positive photovoltaic DC fuse is set in the middle of the box, and is connected to the positive connection copper bar through the anti-reverse diode and then connected to the DC circuit breaker; The DC circuit breaker is arranged on the right side of the positive photovoltaic DC special fuse, and a heat sink is arranged above the DC circuit breaker; a special lightning arrester is arranged on the left side of the negative photovoltaic DC special fuse, and the special lightning arrester is connected to the positive connection copper bar and the negative connection copper bar through connecting wires and then connected to the DC circuit breaker; The intelligent monitoring module is arranged at the upper end of the positive photovoltaic DC dedicated fuse, and the intelligent monitoring module is respectively connected with the Hall sensor, the alarm outside the box and the dedicated lightning arrester signal.
2. The intelligent photovoltaic grid-connected box with anti-reverse function as claimed in claim 1, characterized in that: The number of positive photovoltaic DC dedicated fuses and negative photovoltaic DC dedicated fuses is the same.
3. The intelligent photovoltaic grid-connected box with anti-reverse function as claimed in claim 1, characterized in that: A dressing radiator is provided on the top of the circuit breaker.