CN218071007U - Photovoltaic inverter and photovoltaic grid-connected system - Google Patents
Photovoltaic inverter and photovoltaic grid-connected system Download PDFInfo
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- CN218071007U CN218071007U CN202220584514.6U CN202220584514U CN218071007U CN 218071007 U CN218071007 U CN 218071007U CN 202220584514 U CN202220584514 U CN 202220584514U CN 218071007 U CN218071007 U CN 218071007U
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- 239000000779 smoke Substances 0.000 claims abstract description 82
- 238000001514 detection method Methods 0.000 claims abstract description 45
- 238000010248 power generation Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000004891 communication Methods 0.000 claims description 8
- 230000003993 interaction Effects 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model relates to a photovoltaic inverter and photovoltaic grid-connected system. The photovoltaic inverter comprises an inversion unit, a smoke detection unit, a smoke concentration judgment unit, a temperature detection unit, a main controller unit and a switch unit; the output end of the smoke detection unit is connected with the input end of the smoke concentration judgment unit; the output end of the smoke concentration judging unit is connected with the first input end of the main controller unit; the input end of the temperature detection unit is connected with the first output end of the main controller unit, and the output end of the temperature detection unit is connected with the second input end of the main controller unit; the second output end of the main controller unit is connected with the switch unit; the switching unit is respectively arranged on the input side and the output side of the inversion unit. The photovoltaic grid-connected system comprises a photovoltaic power generation unit, the inverter and a grid-connected unit. The utility model discloses can conveniently investigate system problem, protection system safety, reduce the loss.
Description
Technical Field
The utility model relates to a power electronic technology field is applied to solar photovoltaic power generation system trade, concretely relates to photovoltaic inverter and photovoltaic grid-connected system based on it.
Background
Photovoltaic power generation technology is being developed vigorously all over the world as a renewable energy power generation technology. In the installation and construction process of a photovoltaic power station at the initial construction stage, if the photovoltaic power station is not installed according to the construction standard specification, the inverter is possibly not fully contacted when being connected with a conductive cable, so that the impedance of the connected part is relatively high; after the photovoltaic power station operates for a long time, the resistance of the conductive part in the inverter is large due to the aging of materials in the inverter; improper operation of the inverter during production and assembly results in excessive impedance of the internal conductive portions of the inverter; or when the current carrying capacity of the inverter is weakened due to poor PCB inside the inverter, the inverter has high resistance due to the conductive part in the normal operation process, and further smoke is generated due to overhigh temperature to finally cause fire.
Therefore, most of the existing inverters do not have a smoke detection function, so that the inverters cannot self-detect local high temperature to generate smoke and timely perform power-off protection. At present, a photovoltaic power station personnel cannot know whether a fire point caused by local overhigh temperature exists in an inverter or not, and cannot check the machines in time.
Disclosure of Invention
The utility model aims at providing a have smog and detect the function to guarantee system safety's photovoltaic inverter.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a photovoltaic inverter comprising an inverter unit, the photovoltaic inverter further comprising: the device comprises a smoke detection unit, a smoke concentration judgment unit, a temperature detection unit, a main controller unit and a switch unit;
the output end of the smoke detection unit is connected with the input end of the smoke concentration judgment unit and is used for detecting the smoke concentration in the photovoltaic inverter;
the output end of the smoke concentration judging unit is connected with the first input end of the main controller unit and is used for comparing the smoke concentration in the photovoltaic inverter;
the input end of the temperature detection unit is connected with the first output end of the main controller unit, and the output end of the temperature detection unit is connected with the second input end of the main controller unit, so that the temperature in the photovoltaic inverter can be detected and compared under the control of the main controller unit;
the second output end of the main controller unit is connected with the switch unit and used for controlling the switch unit according to the comparison result of the smoke concentration and the temperature in the photovoltaic inverter;
the switching unit is respectively arranged on the input side and the output side of the inversion unit.
The switching unit includes a plurality of switching elements.
The inverter unit comprises a DC/DC conversion circuit connected with the photovoltaic power generation unit and a DC/AC conversion circuit connected with the DC/DC conversion circuit, and the grid-connected unit is connected with the DC/AC conversion circuit.
The photovoltaic inverter is a single-phase inverter or a three-phase inverter.
The utility model also provides a photovoltaic grid-connected system with smog detects function, security height, its scheme is:
a photovoltaic grid-connected system comprises a photovoltaic power generation unit, an inverter connected with the photovoltaic power generation unit and a grid-connected unit connected with the inverter, wherein the inverter is the photovoltaic inverter.
The photovoltaic power generation unit comprises a plurality of parallel solar panel string.
The grid-connected unit comprises a grid-connected transformer.
The photovoltaic grid-connected system also comprises a monitoring unit in communication connection with the main controller unit.
And the main controller unit is in communication connection with the monitoring unit in a wired or wireless communication mode.
The monitoring unit comprises a human-computer interaction interface.
Because of the application of the technical scheme, compared with the prior art, the utility model has the advantages of it is following: the utility model discloses can conveniently investigate system problem, protection system safety to reduce the loss.
Drawings
Fig. 1 is the utility model discloses a photovoltaic grid-connected system's functional block diagram.
Fig. 2 is a work flow chart of the photovoltaic inverter of the present invention.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings.
The first embodiment is as follows: as shown in fig. 1, a photovoltaic grid-connected system includes a photovoltaic power generation unit, an inverter, and a grid-connected unit, where the inverter is connected to the photovoltaic power generation unit, and the grid-connected unit is connected to an output side of the inverter. The photovoltaic power generation unit comprises a plurality of parallel solar panel group strings. The grid-connected unit comprises a grid-connected transformer.
The inverter employs the following photovoltaic inverter scheme: the photovoltaic inverter is a single-phase inverter or a three-phase inverter and comprises a shell and an inversion unit, wherein the input side of the inversion unit is connected with the photovoltaic power generation unit, and the output side of the inversion unit is connected with a grid-connected transformer of the grid-connected unit. The inverter unit comprises a DC/DC conversion circuit connected with the photovoltaic power generation unit and a DC/AC conversion circuit connected with the DC/DC conversion circuit, and the grid-connected unit is connected with the DC/AC conversion circuit.
The photovoltaic inverter further comprises a smoke detection unit, a smoke concentration judgment unit, a temperature detection unit, a main controller unit and a switch unit. The output end of the smoke detection unit is connected with the input end of the smoke concentration judgment unit and is used for detecting the smoke concentration in the photovoltaic inverter. The output end of the smoke concentration judging unit is connected with the first input end of the main controller unit and used for comparing the smoke concentration in the photovoltaic inverter. The input end of the temperature detection unit is connected with the first output end of the main controller unit, and the output end of the temperature detection unit is connected with the second input end of the main controller unit, so that the temperature in the photovoltaic inverter can be detected and compared under the control of the main controller unit. And the second output end of the main controller unit is connected with the switch unit and used for controlling the switch unit according to the comparison result of the smoke concentration and the temperature in the photovoltaic inverter. The switching unit is respectively arranged on the input side and the output side of the inversion unit. The further concrete scheme is as follows: the smoke detection unit is arranged at a proper position in the shell and used for detecting the smoke concentration in the shell and outputting a corresponding smoke concentration detection signal. The smoke concentration judging unit is arranged in the shell, connected with the smoke detection unit and used for comparing the smoke concentration detected by the smoke detection unit with a preset smoke concentration alarm lower limit value and outputting a smoke concentration comparison result signal. The temperature detection unit is arranged at a proper position in the shell and used for detecting the temperature in the shell based on a temperature detection control signal, comparing the detected temperature with a preset lower limit value of the combustion temperature and outputting a temperature comparison result signal when the detected temperature reaches or exceeds the lower limit value of the combustion temperature. The main controller unit is respectively connected with the smoke concentration judging unit and the temperature detecting unit and is used for outputting a first off-grid signal and a first alarm signal when the smoke concentration detected by the smoke detecting unit reaches or exceeds a smoke concentration alarm lower limit value (smoke is detected) based on a smoke concentration comparison result signal, outputting a temperature detection control signal when the smoke concentration detected by the smoke detecting unit is lower than the smoke concentration alarm lower limit value based on the smoke concentration comparison result signal and outputting a second off-grid signal and a second alarm signal based on the temperature comparison result signal. The switch units are respectively arranged between the photovoltaic power generation unit and the inversion voltage, between the inversion unit and the grid-connected unit and connected with the main controller unit, and are turned off based on the first type of off-grid signals or the second type of off-grid signals. The switching unit includes a plurality of switching elements.
On the basis, the photovoltaic grid-connected system further comprises a monitoring unit (an upper computer monitoring platform), wherein the monitoring unit is in communication connection with the main controller unit in a wired or wireless communication mode and receives the first type of alarm signals or the second type of alarm signals. The monitoring unit comprises a man-machine interaction interface for alarming and reminding based on the first type of alarm signal or the second type of alarm signal.
As shown in fig. 2, the operation flow of the photovoltaic inverter is as follows:
when the photovoltaic inverter is powered on to work, the smoke detection unit detects the smoke concentration in the shell in real time and outputs a corresponding smoke concentration detection signal, and the smoke concentration detection signal contains detected smoke concentration information. The smoke concentration detection signal is transmitted to the smoke concentration judgment unit, the smoke concentration judgment unit compares the smoke concentration detected by the smoke detection unit with a preset smoke concentration alarm lower limit value, so that a smoke concentration comparison result (the smoke concentration detected by the smoke detection unit reaches or exceeds the smoke concentration alarm lower limit value, or the smoke concentration detected by the smoke detection unit is lower than the smoke concentration alarm lower limit value) is obtained, and a smoke concentration comparison result signal containing the smoke concentration comparison result is output. The smoke concentration comparison result signal is transmitted to the main controller unit, when the smoke concentration detected by the smoke detection unit reaches or exceeds the smoke concentration alarm lower limit value, the main controller unit outputs a first type off-grid signal and a first type alarm signal, and when the smoke concentration detected by the smoke detection unit is lower than the smoke concentration alarm lower limit value, the main controller unit outputs a temperature detection control signal; the temperature detection control signal is transmitted to the temperature detection unit, the temperature detection unit detects the temperature in the shell, the detected temperature is compared with a preset lower limit value of the combustion temperature after detection, and if the detected temperature reaches or exceeds the lower limit value of the combustion temperature, the temperature detection unit outputs a temperature comparison result signal; and the temperature comparison result signal is transmitted to the main controller unit, and the main controller unit outputs a second type off-grid signal and a second type alarm signal. And the first type of off-grid signal or the second type of off-grid signal is transmitted to the switch unit, so that the switch unit is controlled to be switched off, the inverter is disconnected with the power grid and the inverter is disconnected with the photovoltaic power generation unit, and the inverter is protected. The photovoltaic inverter can carry out alarm prompt according to the first type of alarm signals or the second type of alarm signals, or the first type of alarm signals or the second type of alarm signals are uploaded to the monitoring unit, so that related personnel are reminded of carrying out fault treatment.
The advantage of setting up the temperature-detecting element in above-mentioned scheme lies in: in some cases, although the smoke concentration is low, combustion may occur, and at this time, the temperature inside the inverter needs to be detected to determine whether the temperature inside the inverter reaches the set combustion temperature lower limit value, so that the problem of misdetection caused by low smoke concentration can be avoided, and the protection performance of the inverter is further improved.
In the above scheme, the smoke concentration determination unit, the temperature detection unit, the main controller unit, and the like may all be implemented by existing hardware schemes, for example, the smoke concentration determination, the temperature detection, and the determination are implemented by a comparison circuit of voltage signals, and then different command signals (off-grid signals) and alarm signals are output based on different comparison result signals.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered in the protection scope of the present invention.
Claims (10)
1. A photovoltaic inverter, includes the contravariant unit, its characterized in that: the photovoltaic inverter further includes: the device comprises a smoke detection unit, a smoke concentration judgment unit, a temperature detection unit, a main controller unit and a switch unit;
the output end of the smoke detection unit is connected with the input end of the smoke concentration judgment unit and is used for detecting the smoke concentration in the photovoltaic inverter;
the output end of the smoke concentration judging unit is connected with the first input end of the main controller unit and used for comparing the smoke concentration in the photovoltaic inverter;
the input end of the temperature detection unit is connected with the first output end of the main controller unit, and the output end of the temperature detection unit is connected with the second input end of the main controller unit, so that the temperature in the photovoltaic inverter can be detected and compared under the control of the main controller unit;
the second output end of the main controller unit is connected with the switch unit and used for controlling the switch unit according to the comparison result of the smoke concentration and the temperature in the photovoltaic inverter;
the switching unit is respectively arranged on the input side and the output side of the inversion unit.
2. The photovoltaic inverter of claim 1, wherein: the switching unit includes a plurality of switching elements.
3. The photovoltaic inverter according to claim 1, wherein: the inverter unit comprises a DC/DC conversion circuit connected with the photovoltaic power generation unit and a DC/AC conversion circuit connected with the DC/DC conversion circuit, and the grid-connected unit is connected with the DC/AC conversion circuit.
4. The photovoltaic inverter according to claim 1, wherein: the photovoltaic inverter is a single-phase inverter or a three-phase inverter.
5. A photovoltaic grid-connected system comprises a photovoltaic power generation unit, an inverter connected with the photovoltaic power generation unit, and a grid-connected unit connected with the inverter, and is characterized in that: the inverter is a photovoltaic inverter as claimed in any one of claims 1 to 4.
6. The grid-connected photovoltaic system according to claim 5, wherein: the photovoltaic power generation unit comprises a plurality of parallel solar panel string.
7. The grid-connected photovoltaic system according to claim 5, wherein: the grid-connected unit comprises a grid-connected transformer.
8. The grid-connected photovoltaic system according to any one of claims 5 to 7, characterized in that: the photovoltaic grid-connected system also comprises a monitoring unit in communication connection with the main controller unit.
9. The grid-connected photovoltaic system according to claim 8, wherein: the main controller unit is in communication connection with the monitoring unit in a wired or wireless communication mode.
10. The grid-connected photovoltaic system according to claim 8, wherein: the monitoring unit comprises a human-computer interaction interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220584514.6U CN218071007U (en) | 2022-03-17 | 2022-03-17 | Photovoltaic inverter and photovoltaic grid-connected system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220584514.6U CN218071007U (en) | 2022-03-17 | 2022-03-17 | Photovoltaic inverter and photovoltaic grid-connected system |
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| Publication Number | Publication Date |
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| CN218071007U true CN218071007U (en) | 2022-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220584514.6U Active CN218071007U (en) | 2022-03-17 | 2022-03-17 | Photovoltaic inverter and photovoltaic grid-connected system |
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| Country | Link |
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| CN (1) | CN218071007U (en) |
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2022
- 2022-03-17 CN CN202220584514.6U patent/CN218071007U/en active Active
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