CN220139249U - Photovoltaic power generation control system - Google Patents
Photovoltaic power generation control system Download PDFInfo
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- CN220139249U CN220139249U CN202321711912.0U CN202321711912U CN220139249U CN 220139249 U CN220139249 U CN 220139249U CN 202321711912 U CN202321711912 U CN 202321711912U CN 220139249 U CN220139249 U CN 220139249U
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- 238000010248 power generation Methods 0.000 title claims abstract description 41
- 238000006243 chemical reaction Methods 0.000 claims abstract description 58
- 239000000779 smoke Substances 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 10
- 230000007935 neutral effect Effects 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000001914 filtration Methods 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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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The utility model relates to a photovoltaic power generation control system, which is characterized in that a first switching unit is arranged between a DC/AC conversion circuit and a grid-connected port of a photovoltaic inverter, and a second switching unit is arranged between the DC/AC conversion circuit and an off-grid port. When the power grid is normal, the first switching unit controls the connection of the DC/AC conversion circuit to the grid-connected phase line branch of the grid-connected port, the second switching unit controls the disconnection of the DC/AC conversion circuit to the grid-connected phase line branch of the off-grid port, and the photovoltaic inverter supplies power for the power grid and the local load at the same time. When the power grid fails, the first switching unit controls the branch of the grid-connected phase line from the DC/AC conversion circuit to the grid-connected port to be disconnected, the second switching unit controls the branch of the grid-connected phase line from the DC/AC conversion circuit to the grid-connected phase line from the grid-connected port to be communicated, and the DC/AC conversion circuit supplies power for the local load, so that even if the power grid is suddenly recovered to be normal, the impact on the photovoltaic inverter can be avoided. By adopting the control mode, the switching function of the power supply mode is integrated into the photovoltaic inverter, an additional distribution box is not needed, the cost is reduced, and the installation is convenient.
Description
Technical Field
The utility model relates to the technical field of photovoltaic power generation, in particular to a photovoltaic power generation control system.
Background
With the popularization and development of photovoltaic inverters, the demands of users tend to be diversified. Especially when the user is normal or abnormal in the electric wire netting, the photovoltaic dc-to-ac converter can both supply power, solves the power failure problem. The photovoltaic inverter is switched from a grid-connected mode to an off-grid mode to operate when the power grid is abnormal, and supplies power for local loads. To prevent the grid from suddenly returning to normal, two independent power supply circuits are required for grid-connected mode and off-grid mode.
In the conventional scheme, in order to realize the switching between the grid-connected mode and the off-grid mode, a distribution box is required to be additionally configured for the photovoltaic inverter to realize the switching between the grid-connected circuit and the off-grid circuit, however, the arrangement of the distribution box increases additional cost and requires consideration of additional installation space.
Disclosure of Invention
Based on this, in order to switch between the grid-connected mode and the off-grid mode in the conventional scheme, a distribution box needs to be additionally configured for the photovoltaic inverter to switch between the grid-connected circuit and the off-grid circuit, however, the arrangement of the distribution box increases additional cost, and the problem of additional installation space needs to be considered, so that the photovoltaic power generation control system is provided.
The utility model provides a photovoltaic power generation control system, which comprises a photovoltaic power generation device and a photovoltaic inverter, wherein the photovoltaic inverter is electrically connected with the photovoltaic power generation device, and the photovoltaic inverter comprises:
the DC/DC conversion circuit is electrically connected with the photovoltaic power generation device;
a DC/AC conversion circuit, an input of the DC/AC conversion circuit being electrically connected to the DC/DC conversion circuit;
the grid-connected port is used for forming connection between the DC/AC conversion circuit and an alternating current power grid, and the DC/AC conversion circuit is electrically connected to the grid-connected port through at least one grid-connected phase line branch and one grid-connected zero line;
the first switch unit is electrically connected between the output end of the DC/AC conversion circuit and the grid-connected port;
the off-grid port is used for forming connection between the DC/AC conversion circuit and the local load, and the DC/AC conversion circuit is electrically connected to the off-grid port through at least one off-grid phase line branch and one off-grid zero line;
and the second switch unit is electrically connected between the output end of the DC/AC conversion circuit and the off-grid port.
The utility model relates to a photovoltaic power generation control system, which is characterized in that a first switching unit is arranged between a DC/AC conversion circuit and a grid-connected port of a photovoltaic inverter, and a second switching unit is arranged between the DC/AC conversion circuit and an off-grid port. When the power grid is normal, the first switching unit controls the connection of the DC/AC conversion circuit to the grid-connected phase line branch of the grid-connected port, the second switching unit controls the disconnection of the DC/AC conversion circuit to the grid-connected phase line branch of the off-grid port, and the photovoltaic inverter supplies power for the power grid and the local load at the same time. When the power grid fails, the first switching unit controls the branch of the grid-connected phase line from the DC/AC conversion circuit to the grid-connected port to be disconnected, the second switching unit controls the branch of the grid-connected phase line from the DC/AC conversion circuit to the grid-connected phase line from the grid-connected port to be communicated, and the DC/AC conversion circuit supplies power for the local load, so that even if the power grid suddenly returns to be normal, the impact on the photovoltaic inverter can not be caused. By adopting the control mode, the switching function of the power supply mode is integrated into the photovoltaic inverter, an additional distribution box is not needed, the cost is reduced, and the installation is convenient.
Drawings
Fig. 1 is a schematic structural diagram of a photovoltaic power generation control system according to an embodiment of the present utility model.
Fig. 2 is a schematic diagram of a part of a photovoltaic power generation control system according to an embodiment of the present utility model.
Fig. 3 is a schematic structural diagram of a photovoltaic power generation control system according to another embodiment of the present utility model.
Reference numerals:
100. a photovoltaic power generation control system; 110. a photovoltaic power generation device; 120. a photovoltaic inverter;
121. a DC/DC conversion circuit; 122. a DC/AC conversion circuit; 123. a grid connection port;
124. a first switching unit; s11, S12, a first relay; 125. off-network ports;
126. a second switching unit; s2, a second relay; 127. a bypass switch unit;
s3, a bypass relay; s4, a grounding relay; 128. a filter circuit;
129a, temperature detection means; 129b, smoke detection means; 129c, a master controller.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
The present utility model provides a photovoltaic power generation control system 100.
As shown in fig. 1, in an embodiment of the present utility model, the photovoltaic power generation control system 100 includes a photovoltaic power generation device 110 and a photovoltaic inverter 120, and the photovoltaic inverter 120 is electrically connected to the photovoltaic power generation device 110. The photovoltaic inverter 120 includes a DC/DC conversion circuit 121, a DC/AC conversion circuit 122, a grid-connected port 123, a first switching unit 124, an off-grid port 125, and a second switching unit 126.
Specifically, the DC/DC conversion circuit 121 is electrically connected to the photovoltaic power generation device 110; an input terminal of the DC/AC conversion circuit 122 is electrically connected to the DC/DC conversion circuit 121; the grid connection port 123 is used for forming a connection between the DC/AC conversion circuit 122 and an alternating current grid, and the DC/AC conversion circuit 122 is electrically connected to the grid connection port 123 through at least one grid connection phase line branch and one grid connection zero line; the first switch unit 124 is electrically connected between the output terminal of the DC/AC conversion circuit 122 and the grid-connected port 123; the off-grid port 125 is used for forming a connection between the DC/AC conversion circuit 122 and a local load, and the DC/AC conversion circuit 122 is electrically connected to the off-grid port 125 through at least one off-grid phase line branch and one off-grid neutral line; the second switching unit 126 is electrically connected between the output of the DC/AC conversion circuit 122 and the off-grid port 125.
In the present embodiment, by providing the first switching unit 124 between the DC/AC conversion circuit 122 and the grid-connected port 123 of the photovoltaic inverter 120, the second switching unit 126 is provided between the DC/AC conversion circuit 122 and the off-grid port 125. When the power grid is normal, the first switching unit 124 controls the connection of the DC/AC conversion circuit 122 to the grid-connected phase line branch of the grid-connected port 123, and the second switching unit 126 controls the disconnection of the DC/AC conversion circuit 122 to the grid-connected phase line branch of the off-grid port 125, so that the photovoltaic inverter 120 supplies power to the power grid and the local load at the same time. When the power grid fails, the first switching unit 124 controls the branch of the grid-connected phase line from the DC/AC conversion circuit 122 to the grid-connected port 123 to be disconnected, and the second switching unit 126 controls the branch of the grid-connected phase line from the DC/AC conversion circuit 122 to the off-grid port 125 to be connected, so that the DC/AC conversion circuit 122 supplies power to the local load, and at this time, even if the power grid suddenly returns to normal, no impact is caused to the photovoltaic inverter 120. By adopting the control mode, the switching function of the power supply mode is integrated into the photovoltaic inverter 120, an additional distribution box is not needed, the cost is reduced, and the installation is convenient.
In one embodiment of the present utility model, the photovoltaic inverter 120 is a three-phase inverter. As shown in FIG. 1, the grid-connected phase line branch circuit comprises L11, L12 and L13, and the grid-connected zero line is N1. The off-grid phase line branch comprises L21, L22 and L23, and the grid-connected zero line is N2.
Of course, the photovoltaic inverter 120 may also be a two-phase inverter or a single-phase inverter.
In one embodiment of the present utility model, as shown in fig. 1, the first switching unit 124 includes a plurality of first relays, and each of the phase line branch and the neutral line are connected in series with the first relay.
In the embodiment, each grid-connected phase line branch and each zero line are independently controlled by the corresponding first relay, so that the safety is high.
In an embodiment of the present utility model, each of the phase line branch and the neutral line are connected in series with a plurality of groups of first relays. As shown in fig. 1, the grid-connected phase line branch and the grid-connected zero line are connected in series with first relays S11 and S12.
In this embodiment, by connecting multiple groups of first relays in series with the grid-connected phase line branch and the grid-connected zero line respectively, adhesion failure of one group of first relays is avoided, and when the photovoltaic inverter 120 does not work, complete disconnection between the inverter and the power grid is ensured, so that safety is further improved.
As shown in fig. 1, in an embodiment of the present utility model, the first switch unit 124 includes a plurality of second relays S2, and each off-grid phase line branch and off-grid neutral line are respectively connected in series with the second relay S2.
In the embodiment, each off-grid phase line branch and zero line are independently controlled by the respective second relay S2, so that the safety is high.
As shown in fig. 1, in an embodiment of the present utility model, the photovoltaic inverter 120 further includes a bypass switch unit 127, and the bypass switch unit 127 is electrically connected between the input terminal of the grid-connected port 123 and the input terminal of the off-grid port 125.
In the present embodiment, by providing the bypass switching unit 127, the photovoltaic inverter 120 supplies power to both the grid and the local load when the power generation amount of the photovoltaic power generation apparatus 110 is sufficient. When the power generation energy of the photovoltaic power generation device 110 is insufficient, the local load can take power from the power grid.
As shown in fig. 1, in an embodiment of the present utility model, the bypass switch unit 127 includes a plurality of bypass relays S3, and each grid-connected phase line branch is electrically connected to an off-grid phase line branch through a bypass relay S3; the grid-connected zero line is electrically connected to the off-grid zero line through a bypass relay S3.
As shown in fig. 1, in an embodiment of the present utility model, the photovoltaic inverter 120 further includes a grounding relay S4, and the grid-connected neutral line and the off-grid neutral line are respectively grounded through the grounding relay S4.
In this embodiment, by setting the grounding relay S4, whether the zero line is grounded is adjusted according to different application requirements, so that the application range is wide.
As shown in fig. 2, in an embodiment of the present utility model, the photovoltaic inverter 120 further includes a filter circuit 128, and the filter circuit 128 is electrically connected between the DC/DC conversion circuit 121 and the photovoltaic power generation device 110.
Specifically, the filter circuit 128 may employ an existing LC filter circuit or an LLC filter circuit.
In the present embodiment, the filtering circuit 128 is configured to filter out the noise signal in the photovoltaic power generation apparatus 110.
As shown in fig. 3, in an embodiment of the present utility model, the photovoltaic inverter 120 further includes a temperature detecting device 129a, a smoke detecting device 129b and a main controller 129c.
Specifically, the temperature detection device 129a is configured to detect a current smoke concentration value in the housing of the photovoltaic inverter 120; specifically, the temperature detection device 129a includes a temperature sensor, and is mounted in the housing of the photovoltaic inverter 120. The smoke detection means 129b is for detecting a current temperature value within the housing of the photovoltaic inverter 120. Specifically, the smoke detection device 129b includes an ionic smoke sensor mounted within the housing of the photovoltaic inverter 120. The main controller 129c is an MCU for outputting an off signal to the first and second switching units 124 and 126 when the current smoke concentration value is greater than the smoke concentration threshold or the current temperature value is greater than the temperature concentration threshold; the temperature detecting means 129a, the smoke detecting means 129b, the first switching unit 124 and the second switching unit 126 are electrically connected to the main controller 129c, respectively.
In the present embodiment, by providing the temperature detecting device 129a and the smoke detecting device 129b, the temperature and smoke in the photovoltaic inverter 120 are detected, and when the threshold value is exceeded, the first switch unit 124 and the second switch unit 126 are controlled to be turned off, so that the DC/AC conversion circuit 122 is disconnected from the power grid or the DC/AC conversion circuit 122 is disconnected from the local load, thereby protecting the photovoltaic inverter 120, and the main controller 129c outputs an alarm signal to remind a relevant person of performing the fault process.
As a further alternative, as shown in fig. 3, the bypass switch unit 127 is electrically connected to the main controller 129c, and the bypass switch unit 127 outputs an on signal to the bypass switch unit 127 when the current smoke concentration value is greater than the smoke concentration threshold or the current temperature value is greater than the temperature concentration threshold.
In this embodiment, by the above arrangement, when both the first switch unit 124 and the second switch unit 126 are turned off, the local load is kept in communication with the power grid through the bypass switch unit, so that the local load power failure caused by the failure of the photovoltaic inverter is avoided.
The technical features of the above embodiments may be combined arbitrarily, and the steps of the method are not limited to the execution sequence, so that all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description of the present specification.
The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.
Claims (10)
1. The utility model provides a photovoltaic power generation control system, includes photovoltaic power generation device and photovoltaic inverter, photovoltaic inverter and photovoltaic power generation device electricity are connected, its characterized in that, photovoltaic inverter includes:
the DC/DC conversion circuit is electrically connected with the photovoltaic power generation device;
a DC/AC conversion circuit, an input of the DC/AC conversion circuit being electrically connected to the DC/DC conversion circuit;
the grid-connected port is used for forming connection between the DC/AC conversion circuit and an alternating current power grid, and the DC/AC conversion circuit is electrically connected to the grid-connected port through at least one grid-connected phase line branch and one grid-connected zero line;
the first switch unit is electrically connected between the output end of the DC/AC conversion circuit and the grid-connected port;
the off-grid port is used for forming connection between the DC/AC conversion circuit and the local load, and the DC/AC conversion circuit is electrically connected to the off-grid port through at least one off-grid phase line branch and one off-grid zero line;
and the second switch unit is electrically connected between the output end of the DC/AC conversion circuit and the off-grid port.
2. The photovoltaic power generation control system of claim 1, wherein the first switching unit comprises a plurality of first relays, and each grid-connected phase line branch and grid-connected zero line are respectively connected in series with the first relay.
3. The photovoltaic power generation control system of claim 2, wherein each of the grid-connected phase line branch and the grid-connected neutral line is connected in series with a plurality of groups of first relays, respectively.
4. The photovoltaic power generation control system of claim 1, wherein the first switching unit comprises a plurality of second relays, each off-grid phase line branch and off-grid neutral line being connected in series with a respective second relay.
5. The photovoltaic power generation control system of claim 1, wherein the photovoltaic inverter further comprises a bypass switching unit electrically connected between the input of the grid-tie port and the input of the off-grid port.
6. The photovoltaic power generation control system of claim 5, wherein the bypass switch unit comprises a plurality of bypass relays, each grid-tie phase leg being electrically connected to an off-grid phase leg through a bypass relay, respectively; and the grid-connected zero line is electrically connected to the off-grid zero line through a bypass relay.
7. The photovoltaic power generation control system of claim 1, wherein the photovoltaic inverter further comprises a ground relay, and the grid-tied and off-grid zero lines are grounded through the ground relay, respectively.
8. The photovoltaic power generation control system of claim 1, wherein the photovoltaic inverter further comprises a filter circuit electrically connected between the DC/DC conversion circuit and the photovoltaic power generation device.
9. The photovoltaic power generation control system of claim 1, wherein the photovoltaic inverter is a three-phase inverter, a two-phase inverter, or a single-phase inverter.
10. The photovoltaic power generation control system of claim 1, wherein the photovoltaic inverter further comprises:
the temperature detection device is used for detecting the current smoke concentration value in the photovoltaic inverter shell;
the smoke detection device is used for detecting the current temperature value in the photovoltaic inverter shell;
the main controller is used for outputting an off signal to the first switch unit and the second switch unit when the current smoke concentration value is larger than the smoke concentration threshold value or the current temperature value is larger than the temperature concentration threshold value;
the temperature detection device, the smoke detection device, the first switch unit and the second switch unit are respectively and electrically connected to the main controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321711912.0U CN220139249U (en) | 2023-06-30 | 2023-06-30 | Photovoltaic power generation control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321711912.0U CN220139249U (en) | 2023-06-30 | 2023-06-30 | Photovoltaic power generation control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220139249U true CN220139249U (en) | 2023-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321711912.0U Active CN220139249U (en) | 2023-06-30 | 2023-06-30 | Photovoltaic power generation control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220139249U (en) |
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2023
- 2023-06-30 CN CN202321711912.0U patent/CN220139249U/en active Active
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