CN220510769U - Safety bypass, photovoltaic inverter and photovoltaic system - Google Patents
Safety bypass, photovoltaic inverter and photovoltaic system Download PDFInfo
- Publication number
- CN220510769U CN220510769U CN202322171062.6U CN202322171062U CN220510769U CN 220510769 U CN220510769 U CN 220510769U CN 202322171062 U CN202322171062 U CN 202322171062U CN 220510769 U CN220510769 U CN 220510769U
- Authority
- CN
- China
- Prior art keywords
- unit
- port
- switch
- switching
- grid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000000087 stabilizing effect Effects 0.000 claims description 15
- 230000009466 transformation Effects 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 6
- 230000001131 transforming effect Effects 0.000 description 6
- 238000010248 power generation Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Landscapes
- Inverter Devices (AREA)
Abstract
The application discloses a safety bypass, a photovoltaic inverter and a photovoltaic system; the safety bypass and the photovoltaic inverter are both applied to the photovoltaic system; the safety bypass comprises an INV port used for connecting an inverter, a GRID port used for connecting a power GRID and a backup port used for connecting a load; the INV port is connected with the GRID port through a first switch circuit, the INV port is connected with the backup port through a second switch circuit, and the GRID port is connected with the backup port through a third switch circuit; the plurality of switch circuits can ensure that the load can always normally operate, and the port voltage of the load is not pulled up due to sudden power failure, so that the working safety of the load can be effectively improved; each switch circuit comprises at least two switch units connected in series, so that the switch circuits can meet the safety requirements.
Description
Technical Field
The application relates to the technical field of photovoltaic power generation, in particular to a safety bypass, a photovoltaic inverter and a photovoltaic system.
Background
The inverter is an energy conversion device in the photovoltaic power generation system and is used for converting direct current output by the photovoltaic panel into alternating current and sending the alternating current into a power grid. The operation mode comprises grid-connected operation of the access power grid and isolated operation of the inverter separated from the power grid.
The existing inverter mainly connects the INV and the load through a backup port; when the battery or the photovoltaic panel of the inverter does not generate electricity or the photovoltaic system fails, the load connected with the backup relay is powered off. However, the power grid is generally in a relatively stable state, when the inverter is stopped due to other faults than the AC faults, all loads connected to the backup port are suddenly powered off, and the voltage of the backup port is instantaneously raised due to the fault stopping of the inverter, so that the use safety of electric equipment connected to the backup port is affected. Therefore, improvements in the structure of the existing inverter are urgently needed.
Disclosure of Invention
It is an object of the present application to provide a safety bypass that addresses the above-mentioned drawbacks of the prior art.
Another object of the present application is to provide a photovoltaic inverter that can solve the above-mentioned drawbacks of the related art.
It is a further object of the present application to provide a photovoltaic system that addresses the above-described deficiencies in the background.
In order to achieve at least one of the above objects, the technical scheme adopted in the application is as follows: a safety bypass, which is applied to a photovoltaic system, and comprises an INV port used for connecting a photovoltaic inverter, a GRID port used for connecting a power GRID and a backup port used for connecting a load; the INV port is connected with the GRID port through a first switch circuit, the INV port is connected with the backup port through a second switch circuit, and the GRID port is connected with the backup port through a third switch circuit; the first switch circuit, the second switch circuit and the third switch circuit all comprise at least two switch units which are connected in series.
Preferably, the safety bypass comprises five switching units; the INV port and the GRID port are connected in series through two or three switch units to form the first switch circuit; the INV port and the backup port are connected in series through two or three switching units to form the second switching circuit; and the GRID port and the backup port are connected in series through two or three switching units to form the third switching circuit.
Preferably, the switch units are a first switch unit, a second switch unit, a third switch unit, a fourth switch unit and a fifth switch unit respectively; the first switch unit, the third switch unit and the fifth switch unit are connected in series between the INV port and the GRID port to form the first switch circuit; the first switching unit and the second switching unit are connected in series between the INV port and the backup port to form the second switching circuit; the fourth switching unit and the fifth switching unit are connected in series between the GRID port and the backup port to form the third switching circuit.
Preferably, the switch units are controllable switches.
Preferably, the switch unit is a relay or a contactor.
A photovoltaic inverter applied to a photovoltaic system; the system comprises the safety bypass, an auxiliary source module and an inversion module; when the photovoltaic system fails, the auxiliary source module is suitable for conducting the third switching circuit of the safety bypass through power supply of the AC side of the inversion module, so that the load is powered through a power grid.
Preferably, the auxiliary source module comprises a voltage transformation unit and a control unit; the control unit is suitable for supplying power to start through the AC side of the inversion module, and further controls the transformation unit to reduce the voltage input by the AC side to meet the power supply requirement of the switching unit in the third switching circuit.
Preferably, the auxiliary source module further comprises a rectifying unit and a current limiting unit; the rectifying unit and the current limiting unit are connected in series; the voltage input by the AC side sequentially passes through the rectifying unit and the current limiting unit to be rectified and limited, and then flows into the transformation unit and the control unit.
Preferably, the auxiliary source module further comprises a voltage stabilizing unit, and the voltage stabilizing unit is suitable for being connected with the control unit; the voltage stabilizing unit is suitable for feeding back the control unit according to the output voltage of the voltage transformation unit.
A photovoltaic system comprises the photovoltaic inverter.
Compared with the prior art, the beneficial effect of this application lies in:
(1) Through setting up a plurality of switch circuit, can guarantee always that the load that backup port connects can normal operating. Particularly, when the photovoltaic system fails, the load can be powered off in an artificial mode, the failure of the equipment can be detected, the port voltage of the load can not be pulled up due to sudden power failure, and further the working safety of the load can be effectively improved.
(2) Each switching circuit can comprise at least two switching units, so that the switching circuits can meet the safety requirements under different working states.
Drawings
Fig. 1 is a schematic structural diagram of a photovoltaic inverter according to the present utility model.
FIG. 2 is a schematic diagram of the safety bypass structure according to the present utility model.
Fig. 3 is a schematic diagram of a state of the safety bypass of the present utility model when the first switch circuit is turned on.
Fig. 4 is a schematic diagram of the second switch circuit of the safety bypass according to the present utility model when turned on.
Fig. 5 is a schematic diagram of the third switch circuit of the safety bypass according to the present utility model when turned on.
Fig. 6 is a schematic structural diagram of an auxiliary source module in the present utility model.
In the figure: the safety bypass 100, the first switch circuit 110, the second switch circuit 120, the third switch circuit 130, the inverter module 200, the auxiliary source module 300, the control unit 310, the transformation unit 320, the rectification unit 330, the current limiting unit 340, the voltage stabilizing unit 350, the power grid 400 and the load 500.
Detailed Description
The present application will be further described with reference to the specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.
In the description of the present application, it should be noted that, for the azimuth terms such as terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present application and simplifying the description, and it is not to be construed as limiting the specific protection scope of the present application that the device or element referred to must have a specific azimuth configuration and operation, as indicated or implied.
It should be noted that the terms "first," "second," and the like in the description and in the claims of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.
One aspect of the present application provides a safety bypass 100, the safety bypass 100 being applied to a photovoltaic system; as shown in fig. 1-5, one of the preferred embodiments of the safety bypass 100 includes an INV port for connecting a photovoltaic inverter, a GRID port for connecting the GRID 400, and a backup port for connecting the load 500. The INV port and the GRID port are connected through a first switch circuit 110, the INV port and the backup port are connected through a second switch circuit 120, and the GRID port and the backup port are connected through a third switch circuit 130.
The photovoltaic system has the following three working states:
(1) The photovoltaic system is connected to the grid, at this time, the first switch circuit 110 can be turned on, and then the photovoltaic inverter is turned on with the power grid 400, so that the electric energy generated by the photovoltaic panel of the photovoltaic system is collected into the power grid 400; meanwhile, the second switch circuit 120 or the third switch circuit 130 is turned on, so that the photovoltaic inverter and the load 500 can be connected, so that power is supplied through the photovoltaic system, and the load 500 can work normally.
(2) The photovoltaic system is off-grid, and at the moment, the first switch circuit 110 is in an off state, and the second switch circuit 120 can be turned on, and the third switch circuit 130 can be turned off; and the photovoltaic system can be communicated with the load 500 through the photovoltaic inverter, so that the photovoltaic system can continuously supply power to the load 500 to ensure the normal operation of the load 500.
(3) The photovoltaic system fails, and at this time, both the first switch circuit 110 and the second switch circuit 120 are in an off state, and the third switch circuit 130 can be turned on; the load 500 may thus communicate with the power grid 400 via the third switching circuit 130, and power the load 500 via the power grid 400 to ensure its normal operation.
As can be seen from the above description, by providing a plurality of switch circuits, the load 500 connected to the backup port can be always ensured to operate normally when the photovoltaic system is in different states. Particularly, when the photovoltaic system fails, the load 500 can be powered off in an artificial mode, and then the failure of the equipment can be detected, so that the port voltage of the load 500 can not be pulled up due to sudden power failure, and further the working safety of the load 500 can be effectively improved.
In this embodiment, as shown in fig. 1 to 5, each of the first switch circuit 110, the second switch circuit 120 and the third switch circuit 130 includes at least two switch units connected in series. The switch circuits can be ensured to meet the safety requirements under different working states.
It will be appreciated that the number of switching circuits is three, and each switching circuit includes at least two switching units for compliance with safety regulations, the number of switching units required for the entire safety bypass is at least three. I.e. the first switching circuit 110 comprises two switching units, one of the switching units of the first switching circuit 110 and the remaining switching unit may form the second switching circuit 120; similarly, another switching unit of the first switching circuit 110 and the remaining switching unit may form a third switching circuit 130; i.e. three switching circuits share a common switching unit with each other.
However, in order to improve the safety of use between the switching circuits, in particular the second switching circuit 120 and the third switching circuit 130, the presence of a common switching unit should be avoided. Thus, the number of switching units of the safety bypass is at least four; that is, the second switching circuit 120 and the third switching circuit 130 each include one independent switching unit, and different switching units constituting the first switching circuit 110.
In one embodiment of the present application, as shown in fig. 1 to 5, the safety bypass 100 includes five switching units; the INV port and the GRID port are connected in series through two or three switch units to form a first switch circuit 110; the INV port and the backup port are connected in series through two or three switching units to form a second switching circuit 120; the GRID port and the backup port are connected in series through two or three switching units to form a third switching circuit 130.
It is understood that the above-mentioned first switch circuit 110, second switch circuit 120 and third switch circuit 130 may all be configured to meet the requirement. But to further avoid interaction of the second switching circuit 120 and the third switching circuit 130; the second switching circuit 120 may be spaced apart from the third switching circuit 130.
Specifically, as shown in fig. 2 to 5, the switching units are a first switching unit K1, a second switching unit K2, a third switching unit K3, a fourth switching unit K4, and a fifth switching unit K5, respectively. The first, third and fifth switching units K1, K3 and K5 are connected in series between the INV port and the GRID port to form the first switching circuit 110. The first and second switching units K1 and K2 are connected in series with each other between the INV port and the backup port to form the second switching circuit 120. The fourth switching unit K4 and the fifth switching unit K5 are connected in series between the GRID port and the backup port to form a third switching circuit 130. So that the second switching circuit 120 and the third switching circuit 130 are spaced apart by the third switching unit K3.
In this embodiment, the switch units are controllable switches, and the specific types and structures of the controllable switches are various, including but not limited to relays or contactors. The specific type of switching unit can be selected by those skilled in the art according to actual needs; for convenience of description of the following, the switching unit preferably employs a relay in the present application.
It should be noted that the switching circuit is turned on by the actuation of the switching unit, which is typically powered by a photovoltaic system. When the photovoltaic system fails in a non-AC manner, the first switch unit K1, the second switch unit K2, and the third switch unit K3 may be turned off and turned on, but the third switch circuit 130 needs to be turned on, that is, the fourth switch unit K4 and the fifth switch unit K5 need to be kept on.
Another aspect of the present application provides a photovoltaic inverter for use in a photovoltaic system; as shown in fig. 1, one of the preferred embodiments of the photovoltaic inverter includes the safety bypass 100, the auxiliary source module 300, and the inverter module 200 described above. The inverter module 200 may convert direct current output from a converter disposed in front of the photovoltaic system into alternating current. The input end of the auxiliary source module 300 may be connected to the output end of the inverter module 200, and the output end of the auxiliary source module 300 may be electrically connected to a switching unit corresponding to the third switching circuit 130. When the photovoltaic system fails in a non-AC manner, the auxiliary source module 300 may conduct the third switching circuit 130 of the safety bypass 100 by supplying power to the AC side (output side) of the inverter module 200, so that the load 500 is supplied with power through the power grid 400 for normal operation.
In this embodiment, as shown in fig. 6, the auxiliary source module 300 includes a voltage transformation unit 320 and a control unit 310. The control unit 310 may supply power to the AC side of the inverter module 200 for starting, and further control the voltage transforming unit 320 to step down the voltage input from the AC side to meet the power supply requirement of the switching units in the third switching circuit 130.
It will be appreciated that the voltage output on the AC side of the inverter module 200 is typically 220V; the voltage requirement for the switching unit to conduct actuation is generally 12V; it is necessary to reduce the voltage outputted from the inverter module 200 to 12V through the transforming unit 320 to satisfy the normal actuation of the switching unit. The specific structure and operation of the transformer unit 320 are well known to those skilled in the art, and the common transformer unit 320 is a transformer.
Meanwhile, the specific structure and operation principle of the control unit 310 are also well known to those skilled in the art, and a control chip, such as a chip with the model of ICE3A, which is commercially available, may be used for the common control unit 310. The ICE3A chip has the functions of starting, VCC power supply, feedback, overcurrent protection and the like, and can meet all requirements of the application.
In this embodiment, as shown in fig. 6, the auxiliary source module 300 further includes a rectifying unit 330 and a current limiting unit 340; the rectifying unit 330 and the current limiting unit 340 are connected in series; the voltage input from the AC side sequentially passes through the rectifying unit 330 and the current limiting unit 340 to be rectified and limited, and then flows into the transforming unit 320 and the control unit 310.
It can be understood that the voltage output from the AC side of the inverter module 200 is an alternating current, and the switching unit performs the actuation requiring a direct current; therefore, the voltage input to the transforming unit 320 at the AC side of the inverter module 200 may be rectified by the rectifying unit 330, so as to convert the AC power into the dc power. Meanwhile, the number of turns of the transformer required for reducing the 220V voltage to 12V is relatively large, that is, the size of the transformer may be large, and in order to reduce the size of the transformer, the rectified voltage may be reduced through the current limiting unit 340 and then input into the transformer for reduction. The specific structure and working principle of the rectifying unit 330 and the current limiting unit 340 are known to those skilled in the art, the rectifying unit 330 generally adopts a rectifying bridge formed by diodes, and the current limiting unit 340 generally adopts a current limiting resistor.
In this embodiment, as shown in fig. 6, the auxiliary source module 300 further includes a voltage stabilizing unit 350, where an output end of the voltage stabilizing unit 350 may be connected to the control unit 310, and an input end of the voltage stabilizing unit 350 may be connected to an output end of the voltage transforming unit 320; the voltage stabilizing unit 350 may further feed back the control unit 310 according to the output voltage of the voltage transforming unit 320.
It can be appreciated that, due to voltage fluctuation in the working process of the photovoltaic system, in order to ensure that the voltage output by the voltage transformation unit 320 can meet the actuation requirement of the switch unit, the output voltage of the voltage transformation unit 320 can be detected by the voltage stabilizing unit 350; however, when the voltage output by the voltage transformation unit 320 does not meet the requirement, the voltage stabilizing unit 350 may feed back the voltage to the control unit 310, so that the control unit 310 may conveniently and timely perform corresponding control. The specific structure and operation principle of the voltage stabilizing unit 350 are well known to those skilled in the art, and a voltage stabilizer may be adopted in the common voltage stabilizing unit 350, such as a commercially available adjustable shunt voltage stabilizer with model TL 431.
A further aspect of the present application provides a photovoltaic system, wherein a preferred embodiment comprises the photovoltaic inverter described above.
The foregoing has outlined the basic principles, main features and advantages of the present application. It will be appreciated by persons skilled in the art that the present application is not limited to the embodiments described above, and that the embodiments and descriptions described herein are merely illustrative of the principles of the present application, and that various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined by the appended claims. The scope of protection of the present application is defined by the appended claims and equivalents thereof.
Claims (10)
1. The safety bypass is applied to a photovoltaic system and is characterized by comprising an INV port used for connecting a photovoltaic inverter, a GRID port used for connecting a power GRID and a backup port used for connecting a load;
the INV port is connected with the GRID port through a first switch circuit;
the INV port and the backup port are connected through a second switch circuit;
the GRID port and the backup port are connected through a third switch circuit;
the first switch circuit, the second switch circuit and the third switch circuit all comprise at least two switch units which are connected in series.
2. The safety bypass of claim 1, wherein: the safety bypass comprises five switch units;
the INV port and the GRID port are connected in series through two or three switch units to form the first switch circuit;
the INV port and the backup port are connected in series through two or three switching units to form the second switching circuit;
and the GRID port and the backup port are connected in series through two or three switching units to form the third switching circuit.
3. The safety bypass of claim 2, wherein: the switch units are a first switch unit, a second switch unit, a third switch unit, a fourth switch unit and a fifth switch unit respectively;
the first switch unit, the third switch unit and the fifth switch unit are connected in series between the INV port and the GRID port to form the first switch circuit;
the first switching unit and the second switching unit are connected in series between the INV port and the backup port to form the second switching circuit;
the fourth switching unit and the fifth switching unit are connected in series between the GRID port and the backup port to form the third switching circuit.
4. The safety bypass of claim 2, wherein: the switch units are controllable switches.
5. The safety bypass of claim 4, wherein: the switch unit is a relay or a contactor.
6. The utility model provides a photovoltaic inverter, is applied to photovoltaic system, its characterized in that: comprising the safety bypass of any one of claims 1-5, and an auxiliary source module and an inverter module;
when the photovoltaic system fails, the auxiliary source module is suitable for conducting the third switch circuit of the safety bypass through AC side power supply of the inversion module.
7. The photovoltaic inverter of claim 6, wherein: the auxiliary source module comprises a voltage transformation unit and a control unit; the control unit is suitable for supplying power to start through the AC side of the inversion module, and further controls the transformation unit to reduce the voltage input by the AC side to meet the power supply requirement of the switching unit in the third switching circuit.
8. The photovoltaic inverter of claim 7, wherein: the auxiliary source module further comprises a rectifying unit and a current limiting unit; the rectifying unit and the current limiting unit are connected in series; the voltage input by the AC side sequentially passes through the rectifying unit and the current limiting unit to be rectified and limited, and then flows into the transformation unit and the control unit.
9. The photovoltaic inverter of claim 7, wherein: the auxiliary source module further comprises a voltage stabilizing unit, and the voltage stabilizing unit is suitable for being connected with the control unit; the voltage stabilizing unit is suitable for feeding back the control unit according to the output voltage of the voltage transformation unit.
10. A photovoltaic system, characterized by: a photovoltaic inverter comprising any one of claims 6-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322171062.6U CN220510769U (en) | 2023-08-14 | 2023-08-14 | Safety bypass, photovoltaic inverter and photovoltaic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322171062.6U CN220510769U (en) | 2023-08-14 | 2023-08-14 | Safety bypass, photovoltaic inverter and photovoltaic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220510769U true CN220510769U (en) | 2024-02-20 |
Family
ID=89880991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322171062.6U Active CN220510769U (en) | 2023-08-14 | 2023-08-14 | Safety bypass, photovoltaic inverter and photovoltaic system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220510769U (en) |
-
2023
- 2023-08-14 CN CN202322171062.6U patent/CN220510769U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2015074417A1 (en) | System for starting large-scale power load in micro grid | |
| CN107294394B (en) | A kind of full-bridge type LLC resonant converter with double fault-tolerant abilitys | |
| CN109888865B (en) | Ship electric power system | |
| CN103633727A (en) | Hybrid electric photovoltaic accumulation system inversion control all-in-one machine | |
| CN212676943U (en) | Structure for live-line-free maintenance of UPS (uninterrupted Power supply) host system | |
| TW201803241A (en) | Distributed module type grid-connected conversion device and its control method especially for storing off-grid electricity in batteries and selling same to a power supplier | |
| CN112398171A (en) | Photovoltaic system, control method thereof and air conditioning system | |
| CN201608640U (en) | Energy-saving power supply board for elevator and elevator control system comprising same | |
| CN220510769U (en) | Safety bypass, photovoltaic inverter and photovoltaic system | |
| CN218825257U (en) | Equipment control system | |
| CN111614151A (en) | Method and structure for live-line-free maintenance of UPS (uninterrupted Power supply) host system | |
| CN204316173U (en) | A kind of duplicate supply input redundancy electric power supply system of Novel photovoltaic inverter | |
| CN202888860U (en) | Off-grid and grid-connected photovoltaic inverter | |
| CN213402467U (en) | Photovoltaic system and air conditioning system | |
| CN211556951U (en) | Power supply circuit and auxiliary power supply circuit | |
| CN205105134U (en) | Multi-controller system and electric control system used for same | |
| CN204578202U (en) | Be applicable to the combined uninterrupted electric operation power of indoor and outdoor circuit breakers | |
| CN113690939A (en) | Light storage all-in-one machine and control method thereof | |
| CN209448499U (en) | A kind of secondary power system and photovoltaic inverting system of photovoltaic inverting system | |
| CN109516326B (en) | Multi-elevator control system | |
| CN220139248U (en) | Inverter system | |
| CN220066969U (en) | Light storage and charging system for direct current screen | |
| CN219499240U (en) | Inverter power supply system | |
| CN219086869U (en) | Emergency rescue device for power failure | |
| CN215870897U (en) | Intelligent super dual-power instantaneous switching integrated device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |