CN219067853U - Low-voltage flexible alternating current-direct current hybrid power distribution system - Google Patents
Low-voltage flexible alternating current-direct current hybrid power distribution system Download PDFInfo
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- CN219067853U CN219067853U CN202223194841.XU CN202223194841U CN219067853U CN 219067853 U CN219067853 U CN 219067853U CN 202223194841 U CN202223194841 U CN 202223194841U CN 219067853 U CN219067853 U CN 219067853U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The utility model relates to the technical field of alternating current-direct current hybrid power distribution, in particular to a low-voltage flexible alternating current-direct current hybrid power distribution system, which is characterized in that a host is at least provided with one set, an AC/DC converter and a first DC/DC converter are arranged in the host, the input end of the AC/DC converter is connected with an original power grid through a three-phase transmission line, and the output end of the AC/DC converter is electrically connected with the first DC/DC converter; the auxiliary machine is at least provided with one set, a second DC/DC converter and a DC/AC converter are arranged in the auxiliary machine, the input end of the second DC/DC converter is electrically connected with the output end of the first DC/DC converter, the output end of the second DC/DC converter is electrically connected with the input end of the DC/AC converter, and the output end of the DC/AC converter is electrically connected with user electric equipment. The utility model can dynamically adjust the output voltage of the system, provide energy required by various load starting processes and running processes, and reduce voltage fluctuation in the high-power load switching process.
Description
Technical Field
The utility model relates to the technical field of alternating current-direct current hybrid power distribution, in particular to a low-voltage flexible alternating current-direct current hybrid power distribution device and a control system thereof.
Background
The existing distribution voltage regulation mostly adopts an autotransformer type voltage regulation technology, and an autotransformer is divided into a main coil and a voltage regulation coil. The voltage regulating coil is a winding with a plurality of taps, the taps are connected in series between input and output through different contacts of the on-load tap-changer, and the tap position is changed, so that the transformation ratio of the autotransformer is changed, and the purpose of regulating voltage is achieved; the main coil is a common winding of the autotransformer, and generates a magnetic field for transferring energy.
Chinese patent publication No. CN202021031602.0 discloses a voltage regulating transformer with an autotransformer, which mainly realizes voltage regulation by connecting an autotransformer in series, reduces current passing through an on-load tap changer, achieves the purpose of voltage regulation, and can be used for high-capacity voltage regulating transformers and low-voltage regulating transformers.
However, the reactive power demand balance state cannot be changed by the scheme, the voltage is temporarily increased, and the reactive power shortage is completely transferred to the main network, so that the voltage of the main network is gradually reduced, and the system voltage breakdown can be caused when the voltage is serious. Meanwhile, the on-load voltage regulation mode reduces the operation reliability of the transformer.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a low-voltage flexible alternating current-direct current hybrid power distribution device and a control system thereof, which convert alternating current into direct current through an AC/DC converter and a DC/DC converter in a host, apply a direct current power distribution technology to a low-voltage distribution network line operation technology, improve the power transmission capacity, improve the controllability of a circuit system and the power supply quality, and effectively solve the problem of low voltage caused by insufficient line load capacity.
The technical scheme of the utility model is as follows:
a low voltage flexible ac/dc hybrid power distribution system for distributing power to a user, the power distribution system comprising:
the system comprises a main machine, wherein the main machine is at least provided with one set, an AC/DC converter and a first DC/DC converter are arranged in the main machine, the input end of the AC/DC converter is connected with an original power grid through a three-phase transmission line, and the output end of the AC/DC converter is electrically connected with the input end of the first DC/DC converter;
the slave machine is at least provided with one set, a second DC/DC converter and a DC/AC converter are arranged in the slave machine, the input end of the second DC/DC converter is electrically connected with the output end of the first DC/DC converter, the output end of the second DC/DC converter is electrically connected with the input end of the DC/AC converter, and the output end of the DC/AC converter is electrically connected with user electric equipment;
the host side device comprises a bypass relay and a first direct current relay, wherein the bypass relay is electrically connected with a host bypass, and the first direct current relay is electrically connected with the first DC/DC converter;
the slave terminal equipment comprises a second direct current relay and an alternating current relay, wherein the second direct current relay is electrically connected with the second DC/DC converter, and the alternating current relay is electrically connected with the DC/AC converter.
Furthermore, the AC/DC converter and the DC/AC converter are three-phase bidirectional converters.
Further, the AC/DC converter has the same topology as the DC/AC converter.
Furthermore, the plurality of sets of hosts are connected in parallel; the input ends of the sets of slaves are connected in parallel.
Furthermore, the host machine adopts a power electronic conversion technology to boost and rectify alternating current into direct current, and the slave machine adopts an electronic power inversion technology to invert the direct current into alternating current.
Further, the master device is electrically connected with the slave device.
The utility model has the following beneficial effects:
1. the AC/DC converter and the DC/DC converter in the host convert alternating current into direct current, and the direct current distribution technology is applied to the low-voltage distribution network line operation technology, so that the power transmission capacity can be improved, the controllability of a circuit system and the power supply quality can be improved, and the problem of low voltage caused by insufficient line load capacity can be effectively solved;
2. when the intelligent control system is used, the output resonance problems of loads such as inductance and capacitance and the starting current problems of loads such as nonlinearity and motors are comprehensively considered, an intelligent control algorithm is applied to comprehensively judge the load states, and finally, energy output required by various load starting processes and running processes is provided through means such as dynamic adjustment of system output voltage and the like, so that voltage fluctuation in a high-power load switching process is reduced, and slave voltage output is more stable.
3. The master machine and the slave machine use a cooperative control technology, the master machine side and the slave machine side actually exchange respective state information through a plurality of redundant communication modes, and the received information is subjected to multiple verification so as to ensure that the system can be properly switched and operated between a direct current power distribution mode and a bypass mode, and the system reliability is high.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model;
fig. 2 is a flowchart of the dc power transmission start-up according to the present utility model.
The reference numerals in the drawings are as follows:
1. a host; 11. an AC/DC converter; 12. a first DC/DC converter; 13. a bypass relay; 14. a first dc relay; 2. a slave; 21. a second DC/DC converter; 22. a DC/AC converter; 23. a second dc relay; 24. an alternating current relay; 3. an original power grid; 4. and the user uses the electric equipment.
Detailed Description
The utility model will now be described in detail with reference to the drawings and to specific embodiments.
As shown in fig. 1 to 2, a low voltage flexible ac/dc hybrid power distribution system for distributing power to a user, the power distribution system comprising:
the power generation system comprises a main machine 1, wherein the main machine 1 is at least provided with one set, an AC/DC converter 11 and a first DC/DC converter 12 are arranged in the main machine 1, the input end of the AC/DC converter 11 is connected with an original power grid 3 through a three-phase transmission line, and the output end of the AC/DC converter 11 is electrically connected with the input end of the first DC/DC converter 12. The host 1 inputs three-phase four-wire to take power from the original power grid 3, and the AC/DC converter 11 and the first DC/DC converter 12 rectify and output 500-750V direct current to replace alternating current in the original line to supply power.
The slave machine 2 is at least provided with one set, a second DC/DC converter 21 and a DC/AC converter 22 are arranged in the slave machine 2, the input end of the second DC/DC converter 21 is electrically connected with the output end of the first DC/DC converter 12, the output end of the second DC/DC converter 21 is electrically connected with the input end of the DC/AC converter 22, and the output end of the DC/AC converter 22 is electrically connected with the consumer 4. After the direct current of the slave 2 is input, the direct current is automatically output to the 50Hz and 220Vac alternating current through the second DC/DC converter 21 and the DC/AC converter 22, and a stable power supply is provided for the end user. The terminal output voltage can be set according to actual requirements.
The host side device comprises a bypass relay 13 and a first direct current relay 14, wherein the bypass relay 13 is electrically connected with a host bypass, and the first direct current relay 14 is electrically connected with the first DC/DC converter 12;
the slave-side device comprises a second direct-current relay 23 and an alternating-current relay 24, wherein the second direct-current relay 23 is electrically connected with the second DC/DC converter 21, and the alternating-current relay 24 is electrically connected with the DC/AC converter 22.
Further, the AC/DC converter 11 and the DC/AC converter 22 are three-phase bidirectional converters.
Further, the AC/DC converter 11 has the same topology as the DC/AC converter 22.
Furthermore, the multiple sets of hosts 1 are connected in parallel; the input ends of the sets of slaves 2 are connected in parallel. The rated power of the host 1 and the slave 2 can be different, and the number of the host 1 and the slave 2 can be selected according to the power topology and the user capacity requirement. The whole device is expanded by the parallel connection of a plurality of sets of the master machine 1 and the slave machines 2, so that the device is convenient to adapt to seasonal or staged capacity changes, and the non-working master machines 1 and the slave machines 2 can be in a standby mode.
Furthermore, the host 1 adopts a power electronic conversion technology to boost and rectify alternating current into direct current, and the slave 2 adopts an electronic power inversion technology to invert the direct current into alternating current.
Further, the master device is electrically connected with the slave device. The direct-current transmission starting process needs that the rectifying end equipment and the inverting end equipment interact respective states through carrier waves, 4G or other communication modes, after the respective states are ensured to be normal, the system starting process is controlled by the rectifying end equipment, and finally the direct-current distribution mode is entered.
The working principle of the utility model is as follows:
when the system distributes power: as shown in fig. 1, a rectifier (i.e. a host 1) inputs three-phase four-wire power (220V alternating current) from an original power grid 3, and outputs 500-750V direct current after rectification through an AC/DC converter 11 and a first DC/DC converter 12 so as to replace alternating current in the original line for power supply; at the end of the user, after the direct current of the inverter (namely the slave 2) is input, the direct current is automatically output into the alternating current of 50Hz and 220Vac through the second DC/DC converter 21 and the DC/AC converter 22, so that the voltage quality of the end user is ensured, the carrying capacity of a circuit is improved, and the circuit loss in the transmission process is reduced. The terminal output voltage can be set according to actual requirements. The direct current distribution mode is that a rectifier boosts and rectifies alternating current into direct current through a power electronic conversion technology and transmits the direct current to an inverter, and the inverter inverts the direct current into alternating current through an electronic power inversion technology. The DC/AC converter 22 and the AC/DC converter 11 have identical topological structures and are three-phase bidirectional converters, so that bidirectional energy flow is supported.
The rated power of the rectifier and the inverter can be adjusted according to the requirements, the number of the rectifiers and the inverters is selected according to the power topology and the user capacity requirements, a plurality of sets of rectifiers are connected together in a parallel mode, the input ends of the inverters are connected in parallel, the output ends of the inverters are not connected in parallel, and the non-working rectifiers and the inverters are in a standby mode.
When the direct-current transmission is started, as shown in fig. 2, the rectifying end equipment and the inverting end equipment interact respective states through carrier waves, 4G or other communication modes, after the respective states are ensured to be normal, the rectifying end equipment controls a system starting flow, and finally the direct-current power distribution mode is entered.
The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.
Claims (6)
1. A low voltage flexible ac/dc hybrid power distribution system for distributing power to a user, the power distribution system comprising:
the system comprises a host (1), wherein the host (1) is at least provided with one set, an AC/DC converter (11) and a first DC/DC converter (12) are arranged in the host (1), the input end of the AC/DC converter (11) is connected with an original power grid (3) through a three-phase transmission line, and the output end of the AC/DC converter (11) is electrically connected with the input end of the first DC/DC converter (12);
the auxiliary machine (2) is at least provided with one set, a second DC/DC converter (21) and a DC/AC converter (22) are arranged in the auxiliary machine (2), the input end of the second DC/DC converter (21) is electrically connected with the output end of the first DC/DC converter (12), the output end of the second DC/DC converter (21) is electrically connected with the input end of the DC/AC converter (22), and the output end of the DC/AC converter (22) is electrically connected with user electric equipment (4);
the host side device comprises a bypass relay (13) and a first direct current relay (14), wherein the bypass relay (13) is electrically connected with a host bypass, and the first direct current relay (14) is electrically connected with the first DC/DC converter (12);
the slave-end equipment comprises a second direct-current relay (23) and an alternating-current relay (24), wherein the second direct-current relay (23) is electrically connected with the second DC/DC converter (21), and the alternating-current relay (24) is electrically connected with the DC/AC converter (22).
2. A low voltage flexible AC/DC hybrid power distribution system according to claim 1, wherein the AC/DC converter (11) and the DC/AC converter (22) are three-phase bi-directional converters.
3. A low voltage flexible AC/DC hybrid power distribution system according to claim 1, characterized in that the AC/DC converter (11) is topologically identical to the DC/AC converter (22).
4. A low voltage flexible ac/dc hybrid power distribution system according to claim 1, wherein said plurality of hosts (1) are connected in parallel; the input ends of the sets of slaves (2) are connected in parallel.
5. The low-voltage flexible alternating current-direct current hybrid power distribution system according to claim 1, wherein the host machine (1) adopts a power electronic conversion technology to boost and rectify alternating current into direct current, and the slave machine (2) adopts an electronic power inversion technology to invert the direct current into alternating current.
6. The system of claim 1, wherein the master device is electrically connected to the slave device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223194841.XU CN219067853U (en) | 2022-11-29 | 2022-11-29 | Low-voltage flexible alternating current-direct current hybrid power distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223194841.XU CN219067853U (en) | 2022-11-29 | 2022-11-29 | Low-voltage flexible alternating current-direct current hybrid power distribution system |
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| Publication Number | Publication Date |
|---|---|
| CN219067853U true CN219067853U (en) | 2023-05-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223194841.XU Active CN219067853U (en) | 2022-11-29 | 2022-11-29 | Low-voltage flexible alternating current-direct current hybrid power distribution system |
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| CN (1) | CN219067853U (en) |
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2022
- 2022-11-29 CN CN202223194841.XU patent/CN219067853U/en active Active
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