CN216530560U - Protection architecture and air conditioner of power supply system - Google Patents
Protection architecture and air conditioner of power supply system Download PDFInfo
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- CN216530560U CN216530560U CN202122570339.3U CN202122570339U CN216530560U CN 216530560 U CN216530560 U CN 216530560U CN 202122570339 U CN202122570339 U CN 202122570339U CN 216530560 U CN216530560 U CN 216530560U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 39
- 238000001514 detection method Methods 0.000 claims description 12
- 230000005347 demagnetization Effects 0.000 claims description 11
- 239000011261 inert gas Substances 0.000 claims description 4
- 238000010891 electric arc Methods 0.000 abstract description 10
- 238000012544 monitoring process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The utility model discloses a protection structure of a power supply system and an air conditioner, wherein the power supply protection structure comprises: the power-off protection component is connected between the two power supply devices and/or between the power supply devices and the conversion device, and the conversion device is connected with the multiple power supply devices. The utility model aims to connect power supply equipment and conversion equipment, monitor the running conditions of the connected power supply equipment and the connected conversion equipment, and timely disconnect the corresponding power supply equipment and the corresponding conversion equipment when faults such as reverse connection, leakage current, direct current arc discharge and the like occur, so that the running of other power supply equipment connected with the conversion equipment is protected from being influenced.
Description
Technical Field
The utility model relates to the field of electric connection, in particular to a protection structure of a power supply system and an air conditioner.
Background
With the development of the photovoltaic industry, photovoltaic inverters and photovoltaic air conditioners are greatly popularized nowadays. The efficiency and the capacity of the inverter are improved, the number of strings of the accessible photovoltaic modules of one photovoltaic inverter is also continuously improved, and the number of the strings is improved from the first string of two strings to four to eight strings. The safety problem of the pv inverter follows, and once a problem occurs in one of the pv modules, the operation condition of the inverter is affected, and the operation condition of the inverter operating in parallel is also affected, which is a great loss to the operation of the whole pv system, so that the monitoring of the operation state of the pv modules is very important for the inverter, but the current market still lacks a design for connecting, monitoring and protecting the pv modules.
SUMMERY OF THE UTILITY MODEL
The utility model provides a protection structure of a power supply system and an air conditioner, aiming at solving the technical problem that a photovoltaic inverter cannot monitor and protect a photovoltaic module connected with the photovoltaic inverter in the prior art.
The technical scheme adopted by the utility model is as follows:
the utility model provides a protection structure of a power supply system and an air conditioner, wherein the protection structure of the power supply system comprises: the power-off protection component is connected between the two power supply devices and/or between the power supply devices and the conversion device, and the conversion device is connected with the multiple power supply devices.
Further, the power-off protection assembly includes:
the attraction module can be automatically attracted or disconnected;
the detection module is used for detecting circuit faults and sending out fault signals when the faults exist;
and the control module controls the suction module to be switched on or off according to the fault signal.
In one embodiment, the detection module comprises: a leakage current sensor to detect a leakage current fault.
In one embodiment, the detection module comprises: a high bandwidth current sensor for detecting a direct current arcing fault.
Further, the leakage current sensor sends a leakage current fault signal to the conversion device, and when the conversion device determines that the leakage current sensor has a misjudgment according to the leakage current fault signal, the conversion device corrects the control instruction of the control module.
Further, the high-bandwidth current sensor sends a direct-current arcing fault signal to the conversion device, and when the conversion device judges that the high-bandwidth current sensor has a misjudgment according to the direct-current arcing fault signal, the conversion device corrects a control instruction of the control module.
In one embodiment, the attraction module includes: the magnetic switch comprises a shell, a first magnet and a second magnet, wherein the first magnet and the second magnet are oppositely arranged on the inner wall of the shell at intervals; the first magnet is fixed in position, the second magnet can move to attract the first magnet, and the polarities of the first magnet and the second magnet are opposite.
In one embodiment, the first magnet and the second magnet are fixedly connected with a wiring terminal, and a wiring port of the wiring terminal is arranged outside the shell.
In one embodiment, the attraction module further includes: the first magnet and the second magnet are disconnected, and the first magnet and the second magnet are connected in a pull-in mode.
In one embodiment, the second magnet is mounted on a fixed base that is connected to the housing inner wall by a spring.
In one embodiment, the demagnetization component comprises: and the demagnetizing coil is arranged around the first magnet in a surrounding manner.
In one embodiment, the wiring terminals are internally provided with anti-reverse connection assemblies, and the anti-reverse connection assemblies are diodes.
Further, the inside of the housing is filled with an inert gas.
In an embodiment, the power supply device is a photovoltaic module, and the conversion device is a photovoltaic inverter.
An air conditioner uses the power-off protection component to be connected with the conversion equipment.
Compared with the prior art, the utility model not only can be connected with the power supply equipment and the conversion equipment, but also can monitor the running conditions of the connected power supply equipment and the conversion equipment, and when faults such as reverse connection, leakage current, direct current arc discharge and the like occur, the connection between the corresponding power supply equipment and the conversion equipment is timely disconnected, so that the running of other power supply equipment connected with the conversion equipment is protected from being influenced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a power-off protection assembly according to an embodiment of the present invention;
FIG. 2 is a flow chart illustrating operation of a leakage current sensor in an embodiment of the present invention;
FIG. 3 is a flow chart of the operation of a high bandwidth current sensor in an embodiment of the present invention;
1. a suction module; 11. a first magnet; 12. a second magnet; 13. a demagnetization coil; 14. a wiring terminal; 15. a spring; 16. a fixed base; 2. a detection module; 3. and a control module.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
With the gradual development of the photovoltaic industry, the efficiency and the capacity of the photovoltaic inverter are obviously improved. For example, the number of strings of accessible photovoltaic modules of a photovoltaic inverter is increasing from the first string, two strings, to four to eight strings. However, the safety problem of the pv inverter is followed, and once a problem occurs in one of the pv modules, the operation of the inverter is affected, and the operation of the other inverters operating in parallel is also affected, which is a great loss to the operation of the whole pv system.
To solve the safety problem, the present invention provides a protection structure of a power supply system, including: the power-off protection component is connected between the two power supply devices and/or between the power supply devices and the conversion device, and the conversion device is connected with the multiple power supply devices. The protection structure of the power supply system aims to connect power supply equipment and conversion equipment, monitor the running conditions of the connected power supply equipment and the connected conversion equipment, and timely disconnect the corresponding power supply equipment and the corresponding conversion equipment when faults such as reverse connection, leakage current, direct current arc discharge and the like occur, so that the running of other power supply equipment connected with the conversion equipment is protected from being influenced.
Wherein can realize that above-mentioned connection, monitoring guard action be the power-off protection subassembly, the power-off protection subassembly includes: the power supply equipment comprises an attraction module 1, wherein the attraction module 1 can be automatically attracted or disconnected, the attraction module 1 is used for connecting the power supply equipment and the conversion equipment, and current transmission is realized between the power supply equipment and the conversion equipment when the attraction module 1 attracts; the detection module 2 is used for detecting whether the current transmission between the power supply equipment and the conversion equipment has a fault or not, and sending out a fault signal when the fault exists; and the control module 3 controls the on-off of the suction module according to the fault signal.
The power-off protection component provided by the utility model can be connected with the power supply equipment and the conversion equipment, and can monitor the current transmission condition between the power supply equipment and the conversion equipment, so that the connection between the power supply equipment and the conversion equipment can be timely disconnected once the conditions of electric leakage, direct current arc discharge and the like occur, the normal operation of the whole power supply system is ensured, the fault positioning is carried out simultaneously, the checking and solving of maintenance personnel are facilitated, and the operation efficiency of the whole power supply system is indirectly improved.
The power-off protection component provided by the utility model is used in a photovoltaic power supply system to connect a photovoltaic component and photovoltaic inverters, each photovoltaic inverter is simultaneously connected with a plurality of strings of photovoltaic components, and the principle and the structure of the utility model are described in detail with reference to the attached drawings and the embodiments.
In this embodiment, as shown in fig. 1, the attraction module 1 is fixed in the housing of the power-off protection component, specifically: the magnetic switch comprises a first magnet 11 and a second magnet 12, wherein the first magnet 11 and the second magnet 12 are respectively fixed on two opposite surfaces of a shell, and the first magnet 11 and the second magnet 12 are opposite in position and opposite in polarity. Meanwhile, the first magnet 11 is directly fixed to the inner wall of the housing, so that the position of the first magnet 11 is fixed and cannot move. The spring 15 is arranged on the surface opposite to the mounting surface of the first magnet, the spring 15 can move towards the first magnet 11, the other end of the spring 15 is connected with a fixed base 16, the second magnet 12 is arranged on the surface of the fixed base 16, which is opposite to the first magnet 11, so that the second magnet can move towards the first magnet along with the extension of the spring until the second magnet is attracted with the first magnet, and the attraction between the first magnet and the second magnet is caused by the action of a magnetic field. Each pair of the first magnet 11 and the second magnet 12 is correspondingly connected with a terminal 14, the terminal 14 is arranged on the outer surface of the shell, and an anti-reverse diode is arranged inside the terminal 14. Two pairs of attraction modules are arranged in each power-off protection assembly, one pair of attraction modules is provided with a positive terminal, and the other attraction module is provided with a negative terminal, so that the photovoltaic assembly can be electrically connected with the inverter as long as a positive lead of the photovoltaic assembly is correspondingly connected with a positive lead of the inverter and a negative lead of the photovoltaic assembly is correspondingly connected with a negative lead of the inverter. Meanwhile, in order to prevent reverse connection during installation, a reverse connection prevention diode is installed in each connection terminal. In addition, in order to timely disconnect the connection between the first magnet 11 and the second magnet 12 when a fault occurs, a demagnetization component is arranged in the shell, the demagnetization component generates a reverse magnetic field when being electrified to disconnect the first magnet and the second magnet which are attracted, the specific demagnetization component is a demagnetization coil 13, and the demagnetization coil 13 is directly fixed with the inner wall of the shell and surrounds the first magnet 11. Therefore, when the detection module 2 detects that the fault exists, the control module 3 can supply current to the demagnetization coil 13 to enable the demagnetization coil to generate a reverse magnetic field, and the first magnetic body 11 and the second magnetic body 12 are in an open state under the action of the reverse magnetic field.
The detection module in the power-off protection component provided by the utility model mainly monitors the most common conditions of leakage current and direct current arc discharge in the actual process, so the detection module 2 provided by the utility model comprises: a leakage current sensor for detecting leakage current faults and a high-bandwidth current sensor for detecting direct current arc discharge faults.
When the photovoltaic inverter operates normally, once the photovoltaic module, a power grid and the ground form a loop, the common-mode voltage charges the capacitor to form leakage current due to the existence of the common-mode capacitor of the photovoltaic module to the ground. When the inverter is connected and installed with a plurality of strings of photovoltaic modules through a plurality of power-off protection modules provided by the utility model, the operation efficiency is improved, the probability of electric leakage is increased along with the increase of the number of the photovoltaic modules. The photovoltaic module monitoring system can monitor the operation condition of the photovoltaic module connected with the inverter, once the photovoltaic module has abnormal leakage current, the leakage current sensor can detect a fault in time and send a fault signal to the control module, the control module can position the faulty photovoltaic module according to the fault signal and simultaneously control the pull-in module connected with the faulty photovoltaic module to be disconnected, the faulty photovoltaic module can stop working, other photovoltaic modules running in parallel cannot be influenced, and resource waste cannot be caused. Specifically, as shown in fig. 2, when a leakage current sensor in a certain power-off protection component detects a continuous 300mA leakage current, an abrupt 30mA leakage current, an abrupt 60mA current or an abrupt 150mA leakage current, a fault signal is sent to the control module 3, and the control module controls the demagnetization coil to generate a directional magnetic field to disconnect the first magnet 11 and the second magnet 12. Meanwhile, in order to prevent the leakage current sensor from misjudging, the fault signal sent by the leakage current sensor is also transmitted to a controller of the inverter connected with the photovoltaic module through a communication device, and the controller analyzes whether the current information corresponding to the fault signal belongs to the types of leakage currents or not again. If the current leakage sensor does not judge by mistake, the controller of the inverter can select to stop the inverter according to the actual use condition (the situation that the inverter is damaged due to the serious current leakage condition possibly exists, and then the inverter can be controlled to stop working to ensure safety) or select to continue working (the inverter is not influenced by the current leakage, the photovoltaic module with the current leakage stops working and the inverter is in a safe state); if the photovoltaic module is not judged to be the wrong photovoltaic module, the leakage current sensor generates misjudgment, so that the controller corrects a control instruction controlled by the control module, the suction module connected with the misjudged photovoltaic module is reconnected, and the misjudged photovoltaic module can work again.
After the photovoltaic module and the connecting part are used for a long time, the phenomena of aging, falling of an insulating layer and the like are avoided, the photovoltaic module at the moment may have direct current arc discharge, once the arc discharge is not processed in time, short circuit is caused if the arc discharge is generated, and fire disasters are caused if the arc discharge is generated, so that the module and equipment are damaged. The utility model has the functions of direct current arc detection and protection, and can ensure safe, stable and efficient operation of the equipment within the service life to the utmost extent. Specifically, as shown in fig. 3, the high-bandwidth current sensor can detect a high-frequency direct current signal generated by the photovoltaic module, and when the high-bandwidth current sensor detects that the amplitude of the high-frequency direct current component exceeds the range, it indicates that a direct current arc exists, so that the high-bandwidth current sensor sends a fault signal to the control module, the control module can position the faulty photovoltaic module according to the fault signal, and simultaneously control the pull-in module of the faulty photovoltaic module to be disconnected, and the faulty photovoltaic module can stop working. Similarly, in order to prevent the high-bandwidth current sensor from making a false judgment, the fault signal sent by the high-bandwidth current sensor is also transmitted to the controller of the inverter connected to the photovoltaic module through the communication device, and the controller analyzes whether the amplitude of the high-frequency direct-current component corresponding to the fault signal exceeds the range again. When the high-bandwidth current sensor does not misjudge, the inverter can select to stop working or continue working according to the actual condition; when the high-bandwidth current sensor judges wrongly, the controller corrects a control instruction controlled by the control module, and the suction module connected with the wrongly judged photovoltaic module is reconnected, so that the wrongly judged photovoltaic module continues to work. Meanwhile, the interior of the shell is filled with inert gas, and once the high-bandwidth current sensor detects that direct current arcing exists, the inert gas can rapidly eliminate electric sparks generated.
In another embodiment, the power-off protection assembly provided by the utility model can be connected with a photovoltaic string and a photovoltaic string, or other devices needing to be connected for use.
The utility model further provides an air conditioner which is powered by the protection structure of the power supply system, and particularly, the power-off protection assembly is connected with the conversion equipment in the protection structure of the power supply system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (14)
1. Protection architecture of power supply system, its characterized in that, connect between two power supply unit, and/or connect the power protection subassembly between power supply unit and conversion equipment, many power supply unit are connected to the conversion equipment, the power protection subassembly includes:
the attraction module can be automatically attracted or disconnected;
the detection module is used for detecting circuit faults and sending out fault signals when the faults exist;
and the control module controls the suction module to be switched on or off according to the fault signal.
2. The protection architecture of a power supply system according to claim 1, characterized in that said detection module comprises: a leakage current sensor to detect a leakage current fault.
3. Protection structure of a power supply system according to claim 1 or 2, characterized in that said detection module comprises: a high bandwidth current sensor for detecting a direct current arcing fault.
4. The protection architecture of a power supply system of claim 2, wherein said leakage current sensor sends a leakage current fault signal to said switching device, and when said switching device determines that said leakage current sensor has a false positive based on said leakage current fault signal, said switching device corrects a control command of said control module.
5. The protection architecture of a power supply system according to claim 3, characterized in that said high-bandwidth current sensor sends a direct-current arcing fault signal to said conversion apparatus, and when said conversion apparatus determines that there is a misjudgment of said high-bandwidth current sensor based on said direct-current arcing fault signal, said conversion apparatus corrects the control command of said control module.
6. The protection structure of a power supply system according to claim 1, wherein the attraction module includes: the magnetic switch comprises a shell, a first magnet and a second magnet, wherein the first magnet and the second magnet are oppositely arranged on the inner wall of the shell at intervals; the first magnet is fixed in position, the second magnet can move to attract the first magnet, and the polarities of the first magnet and the second magnet are opposite.
7. The protection structure of a power supply system according to claim 6, wherein each of said first magnet and said second magnet is fixedly connected to a terminal, and a terminal port of said terminal is provided outside said housing.
8. The protection structure of a power supply system according to claim 6, wherein said attraction module further comprises: the first magnet and the second magnet are disconnected, and the first magnet and the second magnet are connected in a pull-in mode.
9. The protection structure of a power supply system according to claim 6, wherein said second magnet is mounted on a fixed base, said fixed base being connected to an inner wall of said housing by a spring.
10. The protection structure of a power supply system according to claim 8, wherein said demagnetization component includes: and the demagnetizing coil is arranged around the first magnet in a surrounding manner.
11. The protection structure of a power supply system according to claim 7, wherein an anti-reverse connection assembly is arranged inside each of the connection terminals, and the anti-reverse connection assembly is a diode.
12. The protection structure of a power supply system according to claim 6, wherein an inside of said case is filled with an inert gas.
13. A protection architecture for a power supply system according to claim 1, characterized in that said power supply device is a photovoltaic module and said conversion device is a photovoltaic inverter.
14. An air conditioner characterized in that power is supplied by using the protection structure of the power supply system claimed in any one of claims 1 to 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122570339.3U CN216530560U (en) | 2021-10-25 | 2021-10-25 | Protection architecture and air conditioner of power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122570339.3U CN216530560U (en) | 2021-10-25 | 2021-10-25 | Protection architecture and air conditioner of power supply system |
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| Publication Number | Publication Date |
|---|---|
| CN216530560U true CN216530560U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122570339.3U Active CN216530560U (en) | 2021-10-25 | 2021-10-25 | Protection architecture and air conditioner of power supply system |
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| CN (1) | CN216530560U (en) |
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2021
- 2021-10-25 CN CN202122570339.3U patent/CN216530560U/en active Active
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