CN220042993U - Photovoltaic power plant converges management system that high voltage backward flow was prevented to case and converges case - Google Patents
Photovoltaic power plant converges management system that high voltage backward flow was prevented to case and converges case Download PDFInfo
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- CN220042993U CN220042993U CN202321444231.2U CN202321444231U CN220042993U CN 220042993 U CN220042993 U CN 220042993U CN 202321444231 U CN202321444231 U CN 202321444231U CN 220042993 U CN220042993 U CN 220042993U
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052802 copper Inorganic materials 0.000 claims abstract description 26
- 239000010949 copper Substances 0.000 claims abstract description 26
- 230000002265 prevention Effects 0.000 claims abstract description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- YXLXNENXOJSQEI-UHFFFAOYSA-L Oxine-copper Chemical compound [Cu+2].C1=CN=C2C([O-])=CC=CC2=C1.C1=CN=C2C([O-])=CC=CC2=C1 YXLXNENXOJSQEI-UHFFFAOYSA-L 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Abstract
The utility model relates to the technical field of photovoltaic junction boxes, in particular to a high-voltage backflow prevention management system for a junction box of a photovoltaic power station and the junction box, wherein a photovoltaic module group serial positive electrode output cable is connected into a positive electrode junction copper bar through a data acquisition module, the positive electrode output cable is divided into a normally closed main circuit and a normally open branch circuit on an outgoing line side of the data acquisition module, and an anti-reflection diode is connected in series on the normally open branch circuit; the wire inlet side of the positive electrode busbar is connected with a first current transformer after the anti-reflection diode, the wire inlet side of the data acquisition module is connected with a second current transformer, the first current transformer and the second current transformer are connected to a circuit differential protection device, and the circuit differential protection device is connected with a normally closed valve of a normally closed main circuit and a normally open valve of a normally open branch circuit. The reverse flow of high voltage is monitored by the line differential protection device, the normally closed main circuit is opened during the reverse flow, and the normally open branch circuit additionally provided with the anti-reverse diode is closed, so that the extra power loss brought by the anti-reverse diode in a normal state is reduced.
Description
Technical Field
The utility model relates to the technical field of photovoltaic junction boxes, in particular to a management system for preventing high-voltage backflow of a photovoltaic power station junction box and the junction box.
Background
For mountain region photovoltaic power plant, the photovoltaic support is fixed, sets up fixed inclination, because of mountain region photovoltaic regional construction, the sunlight time is inconsistent, has the high priority to receive the sunlight, and low-lying department receives illumination and lags behind relatively to when rising and sunset in the morning, lead to illumination inhomogeneous because of the topography reason, partial subassembly can cause the shadow to shelter from. When the photovoltaic module is shaded, the open circuit voltage, the output power and the like of the module are obviously affected. Because the output voltages of the branches connected in series cannot be equal absolutely, the voltage of each branch always has a difference between high and low, or the output voltage of the branch is reduced due to faults, shadow shielding and the like of one branch, the current of the high-voltage branch flows to the low-voltage branch, even the total output voltage of the square matrix is reduced, and the circulation among components and the damage to the components due to hot spots can occur in serious cases.
The utility model of China with publication number CN201830179U discloses a photovoltaic array combiner box for a solar photovoltaic power generation system, wherein one wiring terminal of each photovoltaic module series is connected to one end of a fuse, the other end of the fuse is connected to an input stage of an anti-reflection diode, and an output stage of the anti-reflection diode is connected to a corresponding positive or negative busbar through a current detection module. However, adding the anti-reflection diode between the photovoltaic module string and the busbar generates additional voltage drop, which causes additional power loss, so whether the anti-reflection diode needs to be connected between the photovoltaic module string and the busbar depends on the specific situation.
Disclosure of Invention
The utility model aims to provide a high-voltage backflow prevention management system for a photovoltaic power station junction box and the junction box, wherein one end of the junction box is connected to an output side of an output cable of a string machine through a current transformer, the other end of the junction box is connected to an input side of a positive electrode junction copper bar through the current transformer, the backflow of high voltage is monitored, a normally closed main circuit is opened during backflow, and a normally open branch circuit provided with an anti-reflection diode is closed, so that extra power loss caused by the anti-reflection diode in a normal state is reduced.
The embodiment of the utility model is realized by the following technical scheme: the management system comprises a data acquisition module, a photovoltaic module group, a positive electrode output cable, a positive electrode bus copper bar, a normal-closed main circuit, a normal-open branch circuit, a reverse-preventing diode and a reverse-preventing diode, wherein the positive electrode output cable is connected to the positive electrode bus copper bar through the data acquisition module;
the wire inlet side of the positive electrode bus copper bar is connected with a first current transformer after the anti-reflection diode, the wire inlet side of the data acquisition module is connected with a second current transformer, the first current transformer and the second current transformer are connected to a circuit differential protection device, and the circuit differential protection device is connected with a normally closed valve of a normally closed main circuit and a normally open valve of a normally open branch circuit.
According to a preferred embodiment, the line differential protection device is connected to a first current transformer on each incoming line side of the positive busbar and to a second current transformer on each incoming line side of the data acquisition module.
According to a preferred embodiment, the line differential protection device is connected to a normally-closed main-line normally-closed valve and a normally-open branch normally-open valve at each outlet side of the data acquisition module.
According to a preferred embodiment, a protection box is installed on the local busbar side, and the line differential protection device is arranged in the protection box.
The utility model also provides a combiner box which is applied to the management system.
According to a preferred embodiment, still include power, lightning protection device and circuit breaker, power one end links to each other with data acquisition module, and the output side of anodal busbar is inserted to the other end, lightning protection device first end links to each other with the power, and the output side of anodal busbar is inserted to the second end, and the output side of negative pole busbar is inserted to the third end, the circuit breaker is all inserted to the output side of anodal busbar and negative pole busbar.
The management system for preventing high-voltage backflow of the junction box of the photovoltaic power station has the following advantages and beneficial effects: according to the utility model, one end of the circuit differential protection device is connected to the output side of the output cable of the string machine through the current transformer, and the other end of the circuit differential protection device is connected to the input side of the positive bus copper bar through the current transformer, so that the backflow of high voltage is monitored, the normally closed main circuit is opened during backflow, and the normally open branch circuit provided with the anti-reflection diode is closed, so that the extra power loss caused by the anti-reflection diode in a normal state is reduced.
Drawings
Fig. 1 is a schematic circuit diagram of a management system for preventing high-voltage backflow of a photovoltaic power station junction box provided by embodiment 1 of the present utility model;
icon: the device comprises a 1-positive electrode output cable, a 2-data acquisition module, a 3-normally closed main circuit, a 4-normally open branch circuit, a 5-anti-reflection diode, a 6-first current transformer, a 7-second current transformer, an 8-positive electrode bus copper bar, a 9-line differential protection device, a 10-power supply, an 11-lightning protection device, a 12-circuit breaker and a 13-negative electrode bus copper bar.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1
Referring to fig. 1, fig. 1 is a schematic circuit diagram of a management system for preventing high voltage backflow of a photovoltaic power station junction box according to an embodiment of the present utility model.
According to the management system for preventing high voltage backflow of the photovoltaic power station junction box, the photovoltaic module group serial positive electrode output cable 1 is connected into the positive electrode junction copper bar 8 through the data acquisition module 2, the positive electrode output cable 1 is divided into two paths on the outgoing line side of the data acquisition module 2 and is connected into the same wiring end of the positive electrode junction copper bar 8, one path is the normally closed main path 3, the other path is the normally open branch path 4, and the normally open branch path 4 is connected with the anti-reflection diode 5 in series.
Further, the wire inlet side of the positive electrode busbar copper 8 is connected with a first current transformer 6 after the anti-reflection diode 5, the wire inlet side of the data acquisition module 2 is connected with a second current transformer 7, the first current transformer 6 and the second current transformer 7 are connected to a circuit differential protection device 9, and the circuit differential protection device 9 is connected with a normally closed valve of the normally closed main circuit 3 and a normally open valve of the normally open branch circuit 4. It should be noted that, the line differential protection device 9 inputs the current vector differences at two ends of the first current transformer 6 and the second current transformer 7, and starts the action element when reaching the set action value, in this embodiment, the first current transformer 6 is used for obtaining the high-voltage backward flow information, the second circuit transformer is used for obtaining the normal value, when the vector difference reaches the set action value, that is, the backward flow occurs, the action element is started, that is, the normally open valve is closed, the normally open valve is opened, the normally open main circuit is connected, the current of the high-voltage group string is prevented from flowing to the low-voltage group string by the anti-reflection diode 5, and the circulation is generated inside the group string.
In summary, the management system for preventing high-voltage backflow of the photovoltaic power station junction box and the technical scheme of the junction box have at least the following advantages and beneficial effects: according to the utility model, one end of the circuit differential protection device 9 is connected to the output side of the output cable of the string machine through the current transformer, the other end of the circuit differential protection device is connected to the input side of the positive bus copper bar 8 through the current transformer, the reverse current of high voltage is monitored, the normally closed main circuit 3 is disconnected during reverse current, and the normally open branch 4 provided with the anti-reflection diode 5 is closed, so that the extra power loss caused by the anti-reflection diode 5 in a normal state is reduced.
Example 2
Unlike example 1, this example further optimizes the above scheme; in one implementation manner of this embodiment, the line differential protection device 9 is connected to the first current transformer 6 at each incoming line side of the positive bus copper bar 8 and the second current transformer 7 at each incoming line side of the data acquisition module 2, that is, one line differential protection device 9 is used for monitoring the backflow. Further, the circuit differential protection device 9 is connected to the normally closed valves of the normally closed main circuit 3 and the normally open branch circuit 4 at each outlet side of the data acquisition module 2, and is integrally controlled by one circuit differential protection device 9; in addition, a protection box is installed on the local junction box side, and the line differential protection device 9 is arranged in the protection box to protect the line differential protection device 9.
Example 3
The present embodiment provides a bus box applying the management system according to embodiment 1 and embodiment 2, the bus box further includes a power supply 10, a lightning protection device 11 and a circuit breaker 12, one end of the power supply 10 is connected with the data acquisition module 2, the other end of the lightning protection device 11 is connected to the output side of the positive bus copper bar 8, the first end of the lightning protection device 11 is connected to the power supply 10, the second end of the lightning protection device is connected to the output side of the positive bus copper bar 8, the third end of the lightning protection device is connected to the output side of the negative bus copper bar 13, and both the output sides of the positive bus copper bar 8 and the negative bus copper bar 13 are connected to the circuit breaker 12.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (6)
1. The management system for preventing high voltage backflow of the photovoltaic power station junction box is characterized in that a photovoltaic module group serial positive electrode output cable (1) is connected into a positive electrode junction copper bar (8) through a data acquisition module (2), the positive electrode output cable (1) is divided into two paths on the outgoing line side of the data acquisition module (2) and is connected into the same wiring end of the positive electrode junction copper bar (8), one path is a normally closed main path (3), the other path is a normally open branch path (4), and the normally open branch path (4) is connected with an anti-reflection diode (5) in series;
the wire inlet side of the positive electrode bus copper bar (8) is connected with a first current transformer (6) after the anti-reflection diode (5), the wire inlet side of the data acquisition module (2) is connected with a second current transformer (7), the first current transformer (6) and the second current transformer (7) are connected to a circuit differential protection device (9), and the circuit differential protection device (9) is connected with a normally closed valve of the normally closed main circuit (3) and a normally open valve of the normally open branch circuit (4).
2. The management system for preventing high-voltage backflow of a photovoltaic power station combiner box according to claim 1, wherein the line differential protection device (9) is connected to a first current transformer (6) at each inlet side of the positive electrode combiner copper bar (8) and a second current transformer (7) at each inlet side of the data acquisition module (2).
3. The management system for preventing high-voltage backflow of the photovoltaic power station combiner box according to claim 2, wherein the line differential protection device (9) is connected to a normally closed valve of a normally closed main circuit (3) and a normally open valve of a normally open branch circuit (4) at each outgoing line side of the data acquisition module (2).
4. A photovoltaic power plant combiner box high voltage backflow prevention management system according to any one of claims 1 to 3, characterized in that a protection box is installed on the local combiner box side, and the line differential protection device (9) is arranged in the protection box.
5. A combiner box, characterized by being applied to the management system according to any one of claims 1 to 4.
6. The junction box according to claim 5, further comprising a power supply (10), a lightning protection device (11) and a circuit breaker (12), wherein one end of the power supply (10) is connected with the data acquisition module (2), the other end of the power supply is connected with the output side of the positive junction copper bar (8), the first end of the lightning protection device (11) is connected with the power supply (10), the second end of the lightning protection device is connected with the output side of the positive junction copper bar (8), the third end of the lightning protection device is connected with the output side of the negative junction copper bar (13), and the output sides of the positive junction copper bar (8) and the negative junction copper bar (13) are connected with the circuit breaker (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321444231.2U CN220042993U (en) | 2023-06-07 | 2023-06-07 | Photovoltaic power plant converges management system that high voltage backward flow was prevented to case and converges case |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321444231.2U CN220042993U (en) | 2023-06-07 | 2023-06-07 | Photovoltaic power plant converges management system that high voltage backward flow was prevented to case and converges case |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220042993U true CN220042993U (en) | 2023-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321444231.2U Active CN220042993U (en) | 2023-06-07 | 2023-06-07 | Photovoltaic power plant converges management system that high voltage backward flow was prevented to case and converges case |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220042993U (en) |
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2023
- 2023-06-07 CN CN202321444231.2U patent/CN220042993U/en active Active
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