CN115313998A - Photovoltaic shutoff device - Google Patents
Photovoltaic shutoff device Download PDFInfo
- Publication number
- CN115313998A CN115313998A CN202211062832.7A CN202211062832A CN115313998A CN 115313998 A CN115313998 A CN 115313998A CN 202211062832 A CN202211062832 A CN 202211062832A CN 115313998 A CN115313998 A CN 115313998A
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- China
- Prior art keywords
- photovoltaic
- controller
- shut
- shutoff device
- inverter
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- 239000003990 capacitor Substances 0.000 claims description 5
- 241000112598 Pseudoblennius percoides Species 0.000 claims description 4
- 230000004913 activation Effects 0.000 claims 1
- 238000010248 power generation Methods 0.000 description 4
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a photovoltaic shutoff device which comprises a controller, a plurality of photovoltaic panels and a plurality of shutoff devices, wherein one end of the controller is connected with the plurality of photovoltaic panels in series, and one photovoltaic panel is used for supplying power to the controller; a shutoff device is arranged between the adjacent photovoltaic panels, the shutoff device is electrically connected with the photovoltaic panels, and the shutoff device is used for cutting off direct current and communicating alternating current; the photovoltaic panel and the shutoff device are connected to one end of the inverter in series, and the other end of the inverter is connected to the controller and the photovoltaic panel.
Description
Technical Field
The invention relates to the technical field of distributed photovoltaics, in particular to a photovoltaic shutoff device.
Background
Solar energy is increasingly gaining attention as a clean energy source. With the further reduction of the photovoltaic power generation cost, the installed capacity of the photovoltaic power generation also presents a situation of explosive growth.
At present, a photovoltaic power generation system generally adopts a group series structure, photovoltaic panels after series connection can form kilovolt direct current high voltage, and safety risks can be formed on personnel under the conditions of maintenance, fire fighting and the like, so that some countries and regions have already developed relevant standards, the photovoltaic power generation system is required to support a quick turn-off function of a component level, high direct current voltage is avoided under the conditions of fire fighting, maintenance and the like, and potential safety hazards are eliminated.
The existing component turn-off technology needs to adopt an additional control line for management and control, and in addition, the existing turn-off technology needs a signal receiving and transmitting device and needs to be powered by an external alternating current power supply, so that the use cost is high, and the efficiency is low.
Disclosure of Invention
In order to solve at least one technical problem, the invention provides a photovoltaic shutoff device.
The present invention provides in a first aspect a photovoltaic shutdown device comprising: controller, a plurality of photovoltaic boards and a plurality of turn-off devices
One end of the controller is connected with a plurality of photovoltaic panels in series, wherein one photovoltaic panel is used for supplying power to the controller;
a cut-off device is arranged between the adjacent photovoltaic panels, the cut-off device is electrically connected with the photovoltaic panels, and the cut-off device is used for cutting off direct current and communicating alternating current;
the photovoltaic panel and the shutoff device are connected to one end of the inverter in series, and the other end of the inverter is connected to the controller and the photovoltaic panel.
In a preferred embodiment of the invention, 3-5 diodes are arranged in series inside the photovoltaic panel.
In a preferred embodiment of the invention, the controller adopts time control, the photovoltaic circuit starts a closed circuit before the sun rises, and can also collect and monitor the voltage of the photovoltaic panel, and the shutoff device is started when the voltage reaches the starting voltage of the inverter.
In a preferred embodiment of the present invention, the shutoff device is provided with a temperature sensor or a temperature fuse.
In a preferred embodiment of the present invention, the shutdown device shuts down the circuit when the temperature is greater than 85 ℃.
In a preferred embodiment of the present invention, the switch-off device conducts ac power by connecting an electromagnetic relay with a high-voltage capacitor.
In a preferred embodiment of the present invention, the controller is provided with a switch, and the switch can be used for manually closing the controller.
In a preferred embodiment of the invention, during the starting stage of the inverter, the controller controls the starting by the electric energy of the photovoltaic panel.
Compared with the prior art, the technical scheme of the invention has the following advantages:
(1) The control circuit of this application adopts photovoltaic system's own circuit, and the system wiring is simple. The cost is reduced, the efficiency is improved, and the failure rate is reduced.
(2) This application does not need signal transmission and receiving equipment, and the shutoff device can rely on photovoltaic system self current to reduce when 0, and the shutoff device cuts off.
(3) The controller does not need an external alternating current power supply to supply power, and only needs to use the electric energy of the photovoltaic panel capacity, so that the installation and the use of the system are facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that some drawings in the following descriptions are embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a wiring diagram of a photovoltaic breaker in an embodiment of the present invention.
1. A shutoff device 2, a photovoltaic panel 3, a controller 4, a diode 5 and an inverter.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be described in further detail with reference to specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Example one
Referring to fig. 1, the present invention provides a photovoltaic shutoff device, including: the controller 3, the photovoltaic panels 2 and the shutdown devices 1;
one end of the controller 3 is connected with a plurality of photovoltaic panels 2 in series, wherein one photovoltaic panel 2 is used for supplying power to the controller 3;
a shutoff device 1 is arranged between the adjacent photovoltaic panels 2, the shutoff device 1 is electrically connected with the photovoltaic panels 2, and the shutoff device 1 is used for cutting off direct current and communicating alternating current;
the photovoltaic system is characterized by further comprising an inverter 5, the photovoltaic panels 2 and the cut-off device 1 are connected to one end of the inverter 5 in series, the other end of the inverter 5 is connected to the controller 3 and the photovoltaic panels 2, and in the starting stage of the inverter 5, the controller 3 is controlled to be started through electric energy of the photovoltaic panels 2.
Further, the shutdown device 1 may shut off direct current, but allow alternating current to pass through, in a shutdown state, the controller 3 may supply power to the shutdown device 1 in a pulsed electricity manner, after all the shutdown devices 1 are closed, the controller becomes a direct current power supply to keep the shutdown device 1 closed, and when the alternating current or direct current of an external circuit disappears, the shutdown device 1 is in an open state when power is lost.
Further, before the inverter 5 is started, the shutdown device 1 is in a shutdown state, the external controller 3 supplies power to the shutdown device 1 through alternating current, after all the shutdown device 1 is switched to direct current to supply power to the shutdown device 1 after the inverter 5 is started, power is supplied by an external power source, only the current of a photovoltaic system is needed to supply power, when an emergency occurs, the inverter 5 is shut down, the current in the system disappears, and the shutdown device 1 is in a shutdown state.
Further, 3-5 diodes 4 are arranged in the photovoltaic panel 2 in series, the controller 3 adopts time control, the photovoltaic circuit starts a closed circuit before the sun rises, the voltage of the photovoltaic panel 2 can also be collected and monitored, and the shutoff device 1 is started when the voltage reaches the starting voltage of the inverter 5.
In other words, the dc-side controller 3 can also add ac or dc power via the circuits of the photovoltaic system and the photovoltaic power station. The controller 3 needs electric energy from one or two photovoltaic cell assemblies and is provided with a main switch which can be manually closed. Powering the photovoltaic array may be done individually for each string of array assemblies.
Further, the controller 3 uses the energy of the photovoltaic panel 2 only in the initial startup phase of the inverter 5, and after the startup of the inverter 5 is completed, the controller 3 will not provide energy to the shutdown device 1. The controller 3 itself can also switch off the photovoltaic panel 2 to which it is connected.
The direct current can be cut off in the shutoff device 1, but the alternating current is allowed to pass through, the shutoff device 1 is turned on, after the shutoff device 1 is turned on, the alternating current or the direct current can be used for supplying power, and then the shutoff device is turned on and is switched to the direct current with small current for supplying power.
The shutoff device 1 can adopt the mode of an electromagnetic relay and a high-voltage capacitor besides adopting an electronic circuit design, alternating current can pass through the capacitor, the relay contact is closed, after the closed photovoltaic inverter 5 is started, the current of a photovoltaic cable flows through a magnet coil, and the generated magnetic field ensures that the relay is closed.
The controller 3 of the relay can adopt time control, a photovoltaic circuit starts a closed circuit before the sun rises, and can also collect and monitor the voltage of the photovoltaic panel 2, and the shutoff device 1 is started when the voltage reaches the starting voltage of the inverter 5.
Further, a temperature sensor or a temperature fuse is arranged on the shutoff device 1, and when the temperature is higher than 85 ℃, the shutoff device 1 turns off the circuit.
Further, the shutoff device 1 conducts alternating current by adopting a mode that an electromagnetic relay is connected with a high-voltage capacitor.
Furthermore, a switch is arranged on the controller, and the switch can be used for manually closing the controller.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to the above-described embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A photovoltaic shutdown, comprising: controller, a plurality of photovoltaic boards and a plurality of turn-off devices
One end of the controller is connected with a plurality of photovoltaic panels in series, wherein one photovoltaic panel is used for supplying power to the controller;
a shutoff device is arranged between the adjacent photovoltaic panels, the shutoff device is electrically connected with the photovoltaic panels, and the shutoff device is used for cutting off direct current and communicating alternating current;
the photovoltaic panel and the shutoff device are connected to one end of the inverter in series, and the other end of the inverter is connected to the controller and the photovoltaic panel.
2. A photovoltaic shut-off device according to claim 1, characterised in that 3-5 diodes are arranged in series inside the photovoltaic panel.
3. The photovoltaic shutoff device of claim 1, wherein the controller is configured to control the time that the photovoltaic circuit is activated to close the circuit before the sun rises and to monitor the voltage across the photovoltaic panel and activate the shutoff device when the voltage reaches the inverter activation voltage.
4. A photovoltaic shut-off device according to claim 1, characterised in that a temperature sensor or a temperature fuse is arranged on the shut-off device.
5. A photovoltaic shut-off device according to claim 4, characterised in that the shut-off device switches off the circuit when the temperature is above 85 degrees Celsius.
6. A photovoltaic shut-off device according to claim 1, characterized in that the shut-off device is adapted to conduct alternating current by means of an electromagnetic relay connected to a high-voltage capacitor.
7. A photovoltaic shut-off device as claimed in claim 6, wherein the controller is provided with a switch which enables the controller to be manually switched off.
8. The photovoltaic shutdown device as claimed in claim 1, wherein the controller controls the startup by the power of the photovoltaic panel during the startup phase of the inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211062832.7A CN115313998A (en) | 2022-09-01 | 2022-09-01 | Photovoltaic shutoff device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211062832.7A CN115313998A (en) | 2022-09-01 | 2022-09-01 | Photovoltaic shutoff device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115313998A true CN115313998A (en) | 2022-11-08 |
Family
ID=83864240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211062832.7A Pending CN115313998A (en) | 2022-09-01 | 2022-09-01 | Photovoltaic shutoff device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115313998A (en) |
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2022
- 2022-09-01 CN CN202211062832.7A patent/CN115313998A/en active Pending
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