CN211127119U - Current backflow prevention protection circuit and photovoltaic grid-connected device - Google Patents
Current backflow prevention protection circuit and photovoltaic grid-connected device Download PDFInfo
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- CN211127119U CN211127119U CN201922495071.4U CN201922495071U CN211127119U CN 211127119 U CN211127119 U CN 211127119U CN 201922495071 U CN201922495071 U CN 201922495071U CN 211127119 U CN211127119 U CN 211127119U
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model is suitable for a photovoltaic power generation technical field provides a protection circuit and photovoltaic grid-connected device are prevented flowing backward by electric current. This protection circuit is prevented flowing backward by electric current includes: the photovoltaic junction box comprises a plurality of photovoltaic junction boxes, direct current circuit breakers, busbars and photovoltaic inverters, wherein the number of the direct current circuit breakers is the same as that of the photovoltaic junction boxes, and the direct current circuit breakers are direct current circuit breakers with tripping devices; each photovoltaic combiner box is connected with a direct current breaker with a trip to form a photovoltaic branch, a plurality of photovoltaic branches are connected into the busbar in parallel, and the output end of the busbar is connected with the photovoltaic inverter. The embodiment of the utility model provides a through the direct current breaker who takes the dropout, there is the short circuit or the reversal abnormal conditions in the photovoltaic conflux case of certain photovoltaic branch road, then photovoltaic inverter initiative dropout this photovoltaic branch road take the direct current breaker who drops out to can be under the condition that does not increase the extra loss, the photovoltaic branch road that breaks down is accurately confirmed, thereby can improve circuit maintenance efficiency.
Description
Technical Field
The utility model belongs to the technical field of photovoltaic power generation, especially, relate to a protection circuit and photovoltaic grid-connected device are prevented flowing backward by electric current.
Background
A photovoltaic grid-connected device in a photovoltaic power station comprises photovoltaic branches formed by serially connecting a plurality of photovoltaic modules, the photovoltaic branches are connected in parallel (the parallel connection is often called confluence), and the photovoltaic branches are connected with an inverter to be inverted into alternating current after confluence. When the photovoltaic combiner box of any photovoltaic branch is in short circuit or reverse connection, the current of other photovoltaic branches may flow back to the photovoltaic combiner box with the short circuit or reverse connection through the busbar, so that the fault is enlarged, and the overall power generation capacity of the photovoltaic power station is reduced.
At present, a method for preventing photovoltaic branches from being reversed is to adopt a reverse diode, that is, a reverse diode is added at the position from each photovoltaic combiner box to a busbar in each photovoltaic branch. However, the adoption of the anti-reverse diode increases certain loss, and the failed photovoltaic branch cannot be determined.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the utility model provides a protection circuit and photovoltaic grid-connected device are prevented flowing backward by electric current to adopt among the solution prior art to prevent that the anti-diode can increase certain loss, and the unable problem of confirming the photovoltaic branch road that breaks down.
The embodiment of the utility model provides a first aspect provides a protection circuit is prevented flowing backward by electric current, include: the photovoltaic junction box comprises a plurality of photovoltaic junction boxes, direct current circuit breakers, busbars and photovoltaic inverters, wherein the direct current circuit breakers are the direct current circuit breakers with tripping devices and are used for tripping the direct current circuit breakers with tripping devices corresponding to the photovoltaic junction boxes when the photovoltaic junction boxes are short-circuited or abnormally connected;
each photovoltaic combiner box is connected with a direct current breaker with a trip to form a photovoltaic branch, a plurality of photovoltaic branches are connected into the busbar in parallel, and the output end of the busbar is connected with the photovoltaic inverter.
In one embodiment, the tripping dc breaker is connected to the positive output terminal of the corresponding photovoltaic combiner box.
In an embodiment, a first end of the tripped direct current breaker is connected with a positive output end of a corresponding photovoltaic combiner box, and a second end of the tripped direct current breaker is connected with the busbar.
In one embodiment, the method further comprises: the number of the current sensors is the same as that of the photovoltaic combiner boxes;
a current sensor is connected to a photovoltaic branch.
In one embodiment, each current sensor is connected to the positive output terminal of the corresponding photovoltaic combiner box.
In one embodiment, the first end of the current sensor is connected to the second end of the trip dc circuit breaker, and the second end of the current sensor is connected to the bus bar.
In one embodiment, the bus bars include a positive bus bar and a negative bus bar;
the plurality of input ends of the positive bus bar are respectively connected with the second end of the direct current breaker with the trip in each photovoltaic branch or respectively connected with the second end of the current sensor in each photovoltaic branch; the output end of the positive busbar is connected with the photovoltaic inverter;
a plurality of input ends of the negative bus bar are respectively connected with the negative end of the photovoltaic bus box in each photovoltaic branch; and the output end of the negative bus bar is connected with the photovoltaic inverter.
In one embodiment, a first input terminal of the photovoltaic inverter is connected to a positive output terminal of the positive bus bar, a second input terminal of the photovoltaic inverter is connected to a negative output terminal of the negative bus bar, and an output terminal of the photovoltaic inverter outputs alternating current.
In one embodiment, the method further comprises: a plurality of alarm devices;
and each alarm device is connected to the corresponding photovoltaic branch and used for giving an alarm when the direct current breaker with the trip in the corresponding photovoltaic branch is tripped.
The embodiment of the utility model provides a first aspect provides a photovoltaic grid-connected device, including any one of the above-mentioned embodiments the current prevent flowing backward protection circuit.
Compared with the prior art, the embodiment of the utility model beneficial effect who exists is: a direct current breaker with tripping is connected through each photovoltaic combiner box to form a photovoltaic branch, a plurality of photovoltaic branches are connected into the busbar in parallel, and the output end of the busbar is connected with the photovoltaic inverter. The embodiment of the utility model provides a through the direct current breaker who takes the dropout, there is the short circuit or the reversal abnormal conditions in the photovoltaic conflux case of certain photovoltaic branch road, then photovoltaic inverter initiative dropout this photovoltaic branch road take the direct current breaker who drops out to can be under the condition that does not increase the extra loss, the photovoltaic branch road that breaks down is accurately confirmed, thereby can improve circuit maintenance efficiency.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced 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 without inventive labor.
Fig. 1 is a schematic structural diagram of a current backflow prevention protection circuit provided in an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a current backflow prevention protection circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a current backflow prevention protection circuit according to another embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical solution of the present invention, the following description is made by using specific examples.
Example one
As shown in fig. 1, an embodiment of the present invention provides a current backflow prevention protection circuit, which includes a plurality of photovoltaic combiner boxes 1, dc breakers, busbars 3 and photovoltaic inverters 4, the number of which is the same as that of the photovoltaic combiner boxes, and is characterized in that the dc breakers are dc breakers 2 with trips, and are used for tripping the corresponding dc breakers 2 with trips when the photovoltaic combiner boxes 1 are short-circuited or abnormally connected reversely;
each photovoltaic combiner box 1 is connected with a direct current breaker 2 with a trip to form a photovoltaic branch, a plurality of photovoltaic branches are connected in parallel to the combiner bar 3, and the output end of the combiner bar 3 is connected with the photovoltaic inverter 4.
Optionally, the direct current breaker 2 with a trip connected in each photovoltaic branch is connected to the positive output end of the corresponding photovoltaic combiner box 1. As can be appreciated, each photovoltaic combiner box 1 output includes a positive output and a negative output.
Optionally, as shown in fig. 2, a first end of the tripped direct current breaker 2 is connected to the positive output end of the corresponding photovoltaic combiner box 1, and a second end of the tripped direct current breaker 2 is connected to the bus bar 3.
Optionally, as shown in fig. 3, the current backflow prevention protection circuit may further include: the same number of current sensors 5 as the photovoltaic combiner boxes. Wherein each current sensor 5 is connected to one of the photovoltaic branches for detecting the current on the photovoltaic branch.
Optionally, each current sensor 5 is connected to the positive output end of the corresponding photovoltaic combiner box 1.
Optionally, a first end of the current sensor 5 is connected to a second end of the trip-equipped dc circuit breaker 2, and a second end of the current sensor 5 is connected to the bus bar 3.
As shown in fig. 2, the bus bar 3 includes a positive bus bar 31 and a negative bus bar 32, and each of the positive bus bar 31 and the negative bus bar 32 includes a plurality of input terminals.
A plurality of input ends of the positive busbar 31 are respectively connected with the second end of the tripping direct current breaker 2 in each photovoltaic branch, or respectively connected with the second end of the current sensor 5 in each photovoltaic branch; the output end of the positive electrode bus bar 31 is connected with the photovoltaic inverter 4.
As can be understood, when a tripped dc breaker 2 is included in each photovoltaic branch, the positive terminal of each photovoltaic combiner box 1 is connected to the first terminal of the tripped dc breaker 2, and the second terminal of the tripped dc breaker 2 is connected to the positive bus bar 31. When each photovoltaic branch circuit comprises a tripping direct current breaker 2 and a current sensor 5, the positive terminal of each photovoltaic combiner box 1 is connected with the first end of the tripping direct current breaker 2, the second end of the tripping direct current breaker 2 is connected with the first end of the current sensor 5, and the second end of the current sensor 5 is connected with the positive busbar 31.
A plurality of input ends of the negative bus bar 32 are respectively connected with the negative end of the photovoltaic combiner box 1 in each photovoltaic branch; the output end of the negative electrode bus bar 32 is connected to the photovoltaic inverter 4.
Optionally, a first input end of the photovoltaic inverter 4 is connected to the positive output end of the positive busbar 31, a second input end of the photovoltaic inverter 4 is connected to the negative output end of the negative busbar 32, and the output end of the photovoltaic inverter 4 outputs alternating current. The photovoltaic inverter 4 is configured to convert the dc power input by each photovoltaic branch into ac power and then output the ac power.
Optionally, the current backflow prevention protection circuit may further include: and each alarm device is connected to the corresponding photovoltaic branch and used for giving an alarm when a direct current breaker with a trip in the corresponding photovoltaic branch is tripped.
Above-mentioned protection circuit is prevented flowing backward by electric current, through increasing the direct current breaker dropout accessory, and increase a current sensor on every photovoltaic branch road, when the protection circuit is prevented flowing backward by electric current normally during operation, the current value that every current sensor detected is the positive value, when the current value that the current sensor of certain photovoltaic branch road detected is the negative value, then confirm that there is the short circuit in the photovoltaic conflux case of this photovoltaic branch road or the abnormal condition of reverse connection, then photovoltaic inverter initiative dropout this photovoltaic branch road's direct current breaker of taking the dropout, and report to the police, so that in time the suggestion customer carries out troubleshooting. Through the utility model provides a protection circuit is prevented flowing backward by electric current can be under the condition that does not increase the extra loss, the photovoltaic branch road of accurate definite breaking down to circuit maintenance efficiency can be improved.
The embodiment of the utility model provides a photovoltaic grid-connected device is still provided, including the electric current in any embodiment of the aforesaid prevent flowing backward protection circuit to have all embodiments the electric current prevent flowing backward the beneficial effect that protection circuit agent.
The above-mentioned embodiments are only used for illustrating the technical solution of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A current backflow prevention protection circuit comprises a plurality of photovoltaic combiner boxes, direct current circuit breakers, busbars and photovoltaic inverters, wherein the direct current circuit breakers are the same in number as the photovoltaic combiner boxes, and the current busbars are characterized in that the direct current circuit breakers are direct current circuit breakers with tripping devices and are used for tripping direct current circuit breakers with tripping devices corresponding to the photovoltaic inverters when the photovoltaic combiner boxes are short-circuited or abnormal in reverse connection;
each photovoltaic combiner box is connected with a direct current breaker with a trip to form a photovoltaic branch, a plurality of photovoltaic branches are connected into the busbar in parallel, and the output end of the busbar is connected with the photovoltaic inverter.
2. The current backflow prevention protection circuit of claim 1, wherein the tripped direct current breaker is connected to the positive output terminal of the corresponding photovoltaic combiner box.
3. The current backflow prevention protection circuit of claim 2, wherein a first end of the tripped direct current breaker is connected to a positive output end of a corresponding photovoltaic combiner box, and a second end of the tripped direct current breaker is connected to the busbar.
4. The current backflow prevention protection circuit of claim 3, further comprising: the number of the current sensors is the same as that of the photovoltaic combiner boxes;
a current sensor is connected to a photovoltaic branch.
5. The current backflow prevention protection circuit of claim 4, wherein each current sensor is connected to the positive output terminal of the corresponding photovoltaic combiner box.
6. The current backflow prevention protection circuit of claim 5, wherein a first end of the current sensor is connected to a second end of the tripped direct current circuit breaker, and a second end of the current sensor is connected to the bus bar.
7. The current backflow prevention protection circuit of claim 6, wherein the bus comprises a positive bus and a negative bus;
the plurality of input ends of the positive bus bar are respectively connected with the second end of the direct current breaker with the trip in each photovoltaic branch or respectively connected with the second end of the current sensor in each photovoltaic branch; the output end of the positive busbar is connected with the photovoltaic inverter;
a plurality of input ends of the negative bus bar are respectively connected with the negative end of the photovoltaic bus box in each photovoltaic branch; and the output end of the negative bus bar is connected with the photovoltaic inverter.
8. The current backflow prevention protection circuit of claim 7, wherein a first input terminal of the photovoltaic inverter is connected to a positive output terminal of the positive bus bar, a second input terminal of the photovoltaic inverter is connected to a negative output terminal of the negative bus bar, and an output terminal of the photovoltaic inverter outputs alternating current.
9. The current backflow prevention protection circuit according to any of claims 1-8, further comprising: a plurality of alarm devices;
and each alarm device is connected to the corresponding photovoltaic branch and used for giving an alarm when the direct current breaker with the trip in the corresponding photovoltaic branch is tripped.
10. A photovoltaic grid-connected device, characterized by comprising the current backflow prevention protection circuit of any one of the preceding claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922495071.4U CN211127119U (en) | 2019-12-31 | 2019-12-31 | Current backflow prevention protection circuit and photovoltaic grid-connected device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922495071.4U CN211127119U (en) | 2019-12-31 | 2019-12-31 | Current backflow prevention protection circuit and photovoltaic grid-connected device |
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| CN211127119U true CN211127119U (en) | 2020-07-28 |
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| CN201922495071.4U Active CN211127119U (en) | 2019-12-31 | 2019-12-31 | Current backflow prevention protection circuit and photovoltaic grid-connected device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113489046A (en) * | 2021-04-16 | 2021-10-08 | 华为技术有限公司 | Photovoltaic system, direct current combiner box and wiring error detection method |
| WO2022141526A1 (en) * | 2020-12-31 | 2022-07-07 | 华为数字能源技术有限公司 | Photovoltaic power generation system, photovoltaic inverter and direct-current combiner box |
-
2019
- 2019-12-31 CN CN201922495071.4U patent/CN211127119U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022141526A1 (en) * | 2020-12-31 | 2022-07-07 | 华为数字能源技术有限公司 | Photovoltaic power generation system, photovoltaic inverter and direct-current combiner box |
| CN113489046A (en) * | 2021-04-16 | 2021-10-08 | 华为技术有限公司 | Photovoltaic system, direct current combiner box and wiring error detection method |
| WO2022218338A1 (en) * | 2021-04-16 | 2022-10-20 | 华为数字能源技术有限公司 | Photovoltaic system, direct-current combiner box and wiring error detection method |
| CN113489046B (en) * | 2021-04-16 | 2024-05-17 | 华为数字能源技术有限公司 | Photovoltaic system, direct current combiner box and wiring error detection method |
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Address after: 361101 Ma Long Road 457, Torch Garden, Xiamen Torch High-tech Zone, Fujian Province Patentee after: Kehua Data Co.,Ltd. Patentee after: ZHANGZHOU KEHUA TECHNOLOGY Co.,Ltd. Address before: 361101 Ma Long Road 457, Torch Garden, Xiamen Torch High-tech Zone, Fujian Province Patentee before: XIAMEN KEHUAHENGSHENG LIMITED BY SHARE Ltd. Patentee before: ZHANGZHOU KEHUA TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20220705 Address after: 361001 room 208-38, Hengye building, No. 100, Xiangxing Road, Xiamen Torch High tech Zone (Xiang'an) Industrial Zone, Xiamen, Fujian Patentee after: Xiamen Kehua shuneng Technology Co.,Ltd. Address before: 361101 Ma Long Road 457, Torch Garden, Xiamen Torch High-tech Zone, Fujian Province Patentee before: Kehua Data Co.,Ltd. Patentee before: ZHANGZHOU KEHUA TECHNOLOGY Co.,Ltd. |