CN216216050U - Power supply system - Google Patents
Power supply system Download PDFInfo
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- CN216216050U CN216216050U CN202122154067.9U CN202122154067U CN216216050U CN 216216050 U CN216216050 U CN 216216050U CN 202122154067 U CN202122154067 U CN 202122154067U CN 216216050 U CN216216050 U CN 216216050U
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Abstract
Power supply system comprising at least one power supply circuit (10). The power supply circuit comprises a first transformer (11), a first rectifier (13), an inverter (15), a second transformer (12) and an energy storage device (16). The input end of the first transformer is used for being connected with a first external alternating current power supply. The input end of the first rectifier is connected with the output end of the first transformer. The input end of the inverter is connected with the output end of the first rectifier. The input end of the second transformer is connected with the output end of the inverter. The output end of the second transformer is used for connecting a load. The output end of the energy storage device is connected with the input end of the inverter. The power supply system can provide stable power supply support for the load.
Description
Technical Field
The utility model relates to a power supply system, in particular to a power supply system capable of providing stable power supply support for a load.
Background
At present, the power supply of a self-shunt excitation system of a large-scale generator is led from the output end of the generator, if a short-circuit fault occurs at a place close to the output end of the generator, the voltage of the output end of the generator drops instantly, the self-shunt excitation system loses power, direct current output is reduced instantly, and the generator loses magnetism, so that the short-circuit current of a fault point cannot be provided by the generator, the air switch at the short-circuit point trips rapidly, the generator is disconnected from a network, and the power supply causes great threat to the stable operation of a power system.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a power supply system which can provide stable power supply support for a load.
The utility model provides a power supply system, which comprises at least one power supply circuit. The power supply circuit includes a first transformer, a first rectifier, an inverter, a second transformer, and an energy storage device. The input end of the first transformer is used for being connected with a first external alternating current power supply. The input end of the first rectifier is connected with the output end of the first transformer. The input end of the inverter is connected with the output end of the first rectifier. The input end of the second transformer is connected with the output end of the inverter. The output end of the second transformer is used for connecting a load. The output end of the energy storage device is connected with the input end of the inverter.
When the power supply system is used, under the normal condition, the power supply system obtains electric energy from a first external alternating current power supply and supplies power to a load through a first transformer, a first rectifier, an inverter and a second transformer. When the power supply system cannot obtain enough electric energy required by the first external alternating current power supply under the conditions of short-circuit fault on the input power grid side of the first external alternating current power supply side and instantaneous voltage drop, the energy storage device can supply power to the load through the inverter and the second transformer, so that stable power support is provided for the load at the moment of short-circuit fault of the power grid at the front stage of the first external alternating current power supply, the system can provide enough energy and fault response time to remove the fault, and the normal operation of the system can be recovered.
In another exemplary embodiment of the mains power supply system, the energy storage device is a super capacitor. Thereby improving the power supply capacity of the power supply system.
In yet another exemplary embodiment of the mains power supply system, the mains power supply system is provided with several power supply circuits. The plurality of power supply circuits are connected in parallel. Thereby improving the power supply capacity of the power supply system.
In yet another exemplary embodiment of the mains power supply system, the power supply circuit further comprises a second rectifier and a charging switch. The output end of the second rectifier is connected with the input end of the energy storage device. The charging switch is connected with the input end of the second rectifier and is used for being connected with a second external alternating current power supply. Thereby facilitating charging of the energy storage device.
In yet another exemplary embodiment of the power supply system of the power source, the power supply circuit further comprises a first switch, a second switch, a third switch and a fourth switch. The first switch is connected with the input end of the first transformer and is used for being connected with a first external alternating current power supply. The second switch is connected with the output end of the first transformer and the input end of the first rectifier. The third switch is connected with the output end of the inverter and the input end of the second transformer. The fourth switch is connected with the output end of the second transformer and is used for connecting a load. Therefore, the tripping protection is provided when short circuit fault occurs, and the safety performance of the power supply system is improved. Furthermore, the number of supply circuits of the access circuit can be adjusted by controlling the switches.
In a further exemplary embodiment of the mains power supply system, the mains power supply system further comprises a third transformer. The input end of the third transformer is used for being connected with a first external alternating current power supply, and the output end of the third transformer is connected with the input end of the power supply circuit. Thereby attenuating the higher harmonics.
In a further exemplary embodiment of the mains power supply system, the mains power supply system further comprises a first changeover switch, a second changeover switch and a synchronization device. The first switch is connected with the output end of the third transformer and is used for connecting a load. The second change-over switch is connected with the output end of the power supply circuit and is used for connecting a load. The synchronizing means are able to control the first and second switches. Therefore, the flexibility and the power supply safety redundancy of the load power supply are improved.
In yet another exemplary embodiment of the mains power supply system, the mains power supply system further comprises a power filter. The power filter is connected with the first change-over switch and the second change-over switch. Thereby suppressing harmonics.
Drawings
The following drawings are only schematic illustrations and explanations of the present invention, and do not limit the scope of the present invention.
Fig. 1 is a circuit diagram for explaining an exemplary embodiment of a power supply system.
Description of the reference symbols
10 supply circuit
11 first transformer
12 second transformer
13 first rectifier
14 second rectifier
15 inverter
16 energy storage device
21 first switch
22 second switch
23 third switch
24 fourth switch
25 charging switch
31 third transformer
41 first changeover switch
42 second change-over switch
43 synchronization device
50 electric power filter
100 power supply system
301 load
302 first external AC power source
Detailed Description
In order to more clearly understand the technical features, objects and effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings, wherein the same reference numerals in the drawings refer to the same or similar structural or functional components.
"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.
In this document, "first", "second", etc. do not mean their importance or order, etc., but merely mean that they are distinguished from each other so as to facilitate the description of the document.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product.
In this context, "connected" may be a direct connection or an indirect connection through a third party.
The utility model provides a power supply system. Fig. 1 is a circuit diagram for explaining an exemplary embodiment of a power supply system. As shown in fig. 1, the power supply system 100 includes a plurality of power supply circuits 10, and the plurality of power supply circuits 10 are connected in parallel. Each supply circuit 10 comprises a first transformer 11, a first rectifier 13, an inverter 15, a second transformer 12 and an energy storage device 16. The input of the first transformer 11 is used for connecting a first external ac power source 302 (the first external ac power source is, for example, the output of the generator). An input terminal of the first rectifier 13 is connected to an output terminal of the first transformer 11 to convert the alternating current into the direct current. An input terminal of the inverter 15 is connected to an output terminal of the first rectifier 13 to convert the direct current into the alternating current. The input of the second transformer 12 is connected to the output of the inverter 15. The output of the second transformer 12 is used to connect a load 301 (e.g. a self-shunt excitation system for generating an excitation field).
The output of the energy storage device 16 is connected to the input of the inverter 15. In the exemplary embodiment, energy storage device 16 is, for example, a super capacitor, but is not limited thereto.
Under normal conditions, the power supply system 100 obtains power from the first external ac power source 302 and supplies power to the load 301 through the first transformer 11, the first rectifier 13, the inverter 15, and the second transformer 12. When the short-circuit fault occurs at the input grid side of the first external ac power source 302 and the voltage drops instantaneously, and the power supply system 100 cannot obtain enough electric energy from the first external ac power source 302 (for example, when the short-circuit fault occurs at a position close to the output end of the generator, the voltage at the output end of the generator drops instantaneously), the energy storage device 16 may supply power to the load 301 through the inverter 15 and the second transformer 12, thereby providing a stable power support for the load at the moment of the short-circuit fault of the grid at the front stage of the first external ac power source, so that the system provides enough energy and fault response time to remove the fault, thereby recovering the normal operation of the system.
In other exemplary embodiments, the number of power supply circuits 10 may be adjusted as needed, for example, only one may be provided.
As shown in fig. 1, in the exemplary embodiment, the power supply circuit 10 also includes a second rectifier 14 and a charging switch 25. The output of the second rectifier 14 is connected to the input of an energy storage device 16. The charging switch 25 is connected to an input terminal of the second rectifier 14 and is used to connect to a second external ac power source, such as a stabilized-voltage ac power source. Thereby facilitating charging of energy storage device 16.
As shown in fig. 1, in the exemplary embodiment, the power supply circuit 10 further includes a first switch 21, a second switch 22, a third switch 23, and a fourth switch 24. The first switch 21, the second switch 22, the third switch 23, and the fourth switch 24 are, for example, vacuum circuit breakers, but are not limited thereto. The first switch 21 is connected to the input terminal of the first transformer 11 and is used for connecting the first external ac power source 302. The second switch 22 connects the output of the first transformer 11 and the input of the first rectifier 13. The third switch 23 connects the output of the inverter 15 and the input of the second transformer 12. The fourth switch 24 is connected to the output of the second transformer 12 and is used to connect the load 301. Therefore, the tripping protection is provided when short circuit fault occurs, and the safety performance of the power supply system is improved. Furthermore, the number of supply circuits 10 connected into the circuit can also be adjusted by controlling these switches (for example the third switch 23).
As shown in fig. 1, in the exemplary embodiment, the power supply system 100 also includes a third transformer 31. The input terminal of the third transformer 31 is used for connecting the first external ac power source 302, and the output terminal of the third transformer 31 is connected to the input terminal of the power supply circuit 10 (i.e. the first switch 21). Thereby attenuating the higher harmonics.
As shown in fig. 1, in the exemplary embodiment, the power supply system 100 further includes a first switch 41, a second switch 42, and a synchronization device 43. The first switch 41 is connected to the output of the third transformer 31 and is used to connect the load 301. The second switch 42 is connected to the output of the power supply circuit 10 and is used to connect to the load 301. By controlling the first switch 41 and the second switch 42, the output terminal of the third transformer 31 can be selectively connected to the load 301 through the power supply circuit 10, or the output terminal of the third transformer 31 can be directly connected to the load 301 according to actual requirements. Therefore, the flexibility and the power supply safety redundancy of the load power supply are improved. The synchronization device 43 can control the first switch 41 and the second switch 42 to realize automatic on-line grid connection.
As shown in fig. 1, in the exemplary embodiment, power supply system 100 also includes a power filter 50. The power filter 50 connects the first changeover switch 41 and the second changeover switch 42. Thereby suppressing harmonics.
It should be understood that although the present description has been described in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications such as combinations, divisions or repetitions of features, which do not depart from the technical spirit of the present invention, should be included in the scope of the present invention.
Claims (8)
1. Mains power supply system, characterized in that it comprises at least one power supply circuit (10), said power supply circuit (10) comprising:
a first transformer (11) having an input terminal for connection to a first external AC source,
a first rectifier (13) having its input connected to the output of the first transformer (11),
an inverter (15) having its input connected to the output of the first rectifier (13),
a second transformer (12) having its input connected to the output of the inverter (15), the output of the second transformer (12) being connected to a load, an
And the output end of the energy storage device (16) is connected with the input end of the inverter (15).
2. A mains power supply system according to claim 1, characterized in that the energy storage means (16) is a supercapacitor.
3. A mains power supply system according to claim 1, characterized in that it is provided with a plurality of said power supply circuits (10), a plurality of said power supply circuits (10) being connected in parallel.
4. A mains power supply system according to claim 1, characterized in that the power supply circuit (10) further comprises:
a second rectifier (14) whose output is connected to the input of the energy storage device (16), and
and the charging switch (25) is connected with the input end of the second rectifier (14) and is used for connecting a second external alternating current power supply.
5. A mains power supply system according to claim 1, characterized in that the power supply circuit (10) further comprises:
a first switch (21) connected to the input of the first transformer (11) and for connecting to a first external alternating current source,
a second switch (22) connecting the output of the first transformer (11) and the input of the first rectifier (13),
a third switch (23) connecting the output of the inverter (15) and the input of the second transformer (12), an
A fourth switch (24) connected to the output of the second transformer (12) and for connecting the load.
6. A mains power supply system according to claim 1, further comprising a third transformer (31), an input of the third transformer (31) being adapted to be connected to a first external ac power source, an output of the third transformer (31) being connected to an input of the power supply circuit (10).
7. The power supply system of claim 6, further comprising:
a first switch (41) connected to the output of said third transformer (31) and for connecting said load;
a second switch (42) connected to the output of the power supply circuit (10) and for connecting the load; and
-a synchronizing device (43) able to control said first switch (41) and said second switch (42).
8. A mains power supply system according to claim 7, characterized in that it further comprises a power filter (50), said power filter (50) connecting said first switch (41) and said second switch (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122154067.9U CN216216050U (en) | 2021-09-07 | 2021-09-07 | Power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122154067.9U CN216216050U (en) | 2021-09-07 | 2021-09-07 | Power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216216050U true CN216216050U (en) | 2022-04-05 |
Family
ID=80918449
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122154067.9U Active CN216216050U (en) | 2021-09-07 | 2021-09-07 | Power supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216216050U (en) |
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2021
- 2021-09-07 CN CN202122154067.9U patent/CN216216050U/en active Active
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