CN111555336A - Power distribution system based on energy router - Google Patents
Power distribution system based on energy router Download PDFInfo
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- CN111555336A CN111555336A CN202010528480.4A CN202010528480A CN111555336A CN 111555336 A CN111555336 A CN 111555336A CN 202010528480 A CN202010528480 A CN 202010528480A CN 111555336 A CN111555336 A CN 111555336A
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- energy router
- power
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- direct current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- 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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- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to a power distribution system based on an energy router. The power distribution system includes: the system comprises a direct current bus, a commercial power grid, a micro-grid, a low-voltage distribution network and an energy router; the utility grid, the energy router and the microgrid are sequentially connected in series; the direct current bus is respectively connected with the micro-grid and the commercial power grid through the energy router; the low-voltage distribution network is connected with the microgrid through an energy router; the energy router is used for controlling the flow of energy in the direct current bus, the utility grid, the microgrid and the low-voltage distribution network. The power distribution system based on the energy router improves the reliability of the power distribution system and reduces the operation loss.
Description
Technical Field
The invention relates to the field of power supply systems, in particular to a power distribution system based on an energy router.
Background
Alternating current electric energy has been difficult to meet the requirements of current social sustainable development and users on electric energy forms. The alternating current-direct current hybrid power supply is a main form of a future power grid, and the main reasons are as follows: the asynchronous power grids in different areas are connected by using a direct current link to replace the original alternating current interconnection mode, so that the short-circuit current level of the alternating current power grid is effectively reduced, and the large-area power failure risk caused by faults is reduced. The traditional alternating-current power distribution network is difficult to absorb large-capacity distributed energy, and a direct-current power grid connection mode is adopted, so that on one hand, the loss of connection equipment can be effectively reduced, and on the other hand, the interference of intermittent fluctuation of the distributed power supply to the original power grid can be effectively reduced. The traditional power distribution network adopts a mode of closed-loop wiring single radiation operation, and the power supply quality and the power supply reliability are difficult to ensure.
Disclosure of Invention
The invention aims to provide a power distribution system based on an energy router, which improves the reliability of the power distribution system and reduces the operation loss.
In order to achieve the purpose, the invention provides the following scheme:
an energy router based power distribution system comprising: the system comprises a direct current bus, a commercial power grid, a micro-grid, a low-voltage distribution network and an energy router;
the utility grid, the energy router and the microgrid are sequentially connected in series; the direct current bus is respectively connected with the micro-grid and the commercial power grid through the energy router; the low-voltage distribution network is connected with the microgrid through an energy router;
the energy router is used for controlling the flow of energy in the direct current bus, the utility grid, the microgrid and the low-voltage distribution network.
Optionally, the energy router includes a plurality of energy router modules and a power balancing controller;
the input end of each energy router module is connected with the commercial power grid, and the output end of each energy router module is connected with the microgrid; two adjacent energy router modules are connected with each other;
the power balance controller is connected with each energy router module and is used for balancing power among the energy router modules.
Optionally, the energy router module includes a primary side rectifier sub-module, a high-frequency isolation transformer, and a secondary side rectifier sub-module;
the primary side rectifier sub-module, the high-frequency isolation transformer and the secondary side rectifier sub-module are sequentially connected in series; the primary side rectifier submodule and the secondary side rectifier submodule have the same structure and are in a symmetrical structure relative to the high-frequency isolation transformer.
Optionally, the primary side rectifier sub-module includes a three-phase bridge rectifier unit, a bypass unit, a dc filter unit, a power flow control unit, and a single-phase H-bridge power unit;
the input end of the three-phase bridge type rectifying unit is connected with the commercial power grid, and the output end of the three-phase bridge type rectifying unit is respectively connected with the input end of the bypass unit and the input end of the direct current filtering unit; the output end of the bypass unit and the output end of the direct current filter unit are both connected with the input end of the power flow control unit, the output end of the power flow control unit is connected with the input end of the single-phase H-bridge power unit, and the output end of the single-phase H-bridge power unit is connected with the high-frequency isolation transformer.
Optionally, the bypass unit includes a bypass switch.
Optionally, the method further includes: a distributed power supply and switch;
the distributed power supply is connected with the energy router through the exchanger and the direct current bus.
Optionally, the distributed power supply includes: roof photovoltaic module and lithium iron phosphate battery.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the power distribution system based on the energy router, the energy router replaces part of original contact switches, so that the controllability of the power distribution network is greatly improved, the utilization efficiency of equipment is improved, and the power supply reliability and the power quality of the power distribution network are improved. The power distribution system based on the energy router has the characteristics of simplicity, high reliability and safety, high efficiency, simplicity and convenience in maintenance, low operation cost and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described 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 exercise.
Fig. 1 is a schematic structural diagram of a power distribution system based on an energy router according to the present invention;
fig. 2 is a schematic diagram of a topology structure of an energy router module provided in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a power distribution system based on an energy router, which improves the reliability of the power distribution system and reduces the operation loss.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a power distribution system based on an energy router, as shown in fig. 1, the power distribution system based on an energy router provided by the present invention includes: the system comprises a direct current bus 3, a commercial power grid 1, a micro-grid 2, a low-voltage distribution network and an energy router 4.
The utility grid 1, the energy router 4 and the microgrid 2 are sequentially connected in series; the direct current bus 3 is respectively connected with the microgrid 2 and the utility grid 1 through the energy router 4; the low-voltage distribution network is connected with the microgrid 2 through an energy router 4. Namely, a low-voltage alternating current and direct current interconnected hybrid power supply system is formed through the connection.
The energy router 4 is used for controlling the flow of energy in the direct current bus 3, the utility grid 1, the microgrid 2 and the low-voltage distribution network.
The energy router 4 comprises a plurality of energy router modules 41 and a power balancing controller.
The input end of each energy router module 41 is connected with the utility grid 1, and the output end of each energy router module 41 is connected with the microgrid 2; two adjacent energy router modules 41 are connected to each other; the energy router 4 adopts an input-parallel-output-parallel (IPOP) interconnection structure.
The power balancing controller is connected with each energy router module 41, and is used for balancing power among a plurality of energy router modules 41. Namely, the power balance of each energy router module 41 is realized through the power balance controller, and the controllability of the power distribution network is greatly improved.
The energy router module 41 includes a primary side rectifier module, a high frequency isolation transformer, and a secondary side rectifier module, as shown in fig. 2.
The primary side rectifier sub-module, the high-frequency isolation transformer and the secondary side rectifier sub-module are sequentially connected in series; the primary side rectifier submodule and the secondary side rectifier submodule have the same structure and are in a symmetrical structure relative to the high-frequency isolation transformer.
The primary side rectifier sub-module and the secondary side rectifier sub-module are interconnected through an isolation transformer to achieve electrical isolation and improve the quality of electric energy, have tidal current controllability, maintain the voltage stability of the direct current bus 3 by adjusting the power on the direct current bus 3 in real time, and also can effectively reduce the interference of intermittent fluctuation of the distributed power supply 5 on the original power grid.
The primary side rectifier submodule comprises a three-phase bridge type rectifier unit, a bypass unit, a direct current filter unit, a power flow control unit and a single-phase H-bridge power unit.
The input end of the three-phase bridge type rectifying unit is connected with the commercial power grid 1, and the output end of the three-phase bridge type rectifying unit is respectively connected with the input end of the bypass unit and the input end of the direct current filtering unit; the output end of the bypass unit and the output end of the direct current filter unit are both connected with the input end of the power flow control unit, the output end of the power flow control unit is connected with the input end of the single-phase H-bridge power unit, and the output end of the single-phase H-bridge power unit is connected with the high-frequency isolation transformer.
The three-phase bridge type rectifying unit can realize AC/DC conversion of commercial power; the direct current filtering unit can realize harmonic filtering and improve the quality of electric energy; when the bypass unit and the bypass unit cooperate to act, the bypass unit can be switched off when the module is in operation failure or is overhauled, and the system operation is not influenced; the power flow control unit can improve the power flow; the single-phase H-bridge power unit realizes DC/AC conversion.
The high-frequency isolation transformer is single-phase, and compared with a three-phase high-frequency isolation transformer, the single-phase high-frequency isolation transformer has the advantages of small occupied space, high economy and the like.
The bypass unit includes a bypass switch. When the energy router module 41 is in failure shutdown or maintenance, the energy router module 41, the utility grid 1 and the bypass switch thereof are controlled to realize the operation without power outage, so that the utilization efficiency of the equipment is improved, and the power supply reliability and the power quality of the power distribution network are improved.
In order to realize the direct access of the large-capacity distributed power supply 5, the power distribution system based on the energy router further comprises: a distributed power source 5 and a switch. The distributed power supply 5 includes: roof photovoltaic module and lithium iron phosphate battery.
The distributed power supply 5 is connected with the energy router 4 through the exchanger and the direct current bus 3. The distributed power supply 5 is connected with the energy router 4, so that the loss of the access equipment is effectively reduced.
Furthermore, the electric automobile is charged with loads such as a load, an energy storage device, a high-speed locomotive traction load, a variable frequency motor and the like, and the loads of the type are directly connected to a direct current power grid, so that one-level electric energy conversion is reduced, and the running loss is reduced.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. An energy router based power distribution system, comprising: the system comprises a direct current bus, a commercial power grid, a micro-grid, a low-voltage distribution network and an energy router;
the utility grid, the energy router and the microgrid are sequentially connected in series; the direct current bus is respectively connected with the micro-grid and the commercial power grid through the energy router; the low-voltage distribution network is connected with the microgrid through an energy router;
the energy router is used for controlling the flow of energy in the direct current bus, the utility grid, the microgrid and the low-voltage distribution network.
2. The energy router-based power distribution system of claim 1, wherein the energy router comprises a plurality of energy router modules and a power balancing controller;
the input end of each energy router module is connected with the commercial power grid, and the output end of each energy router module is connected with the microgrid; two adjacent energy router modules are connected with each other;
the power balance controller is connected with each energy router module and is used for balancing power among the energy router modules.
3. The energy router-based power distribution system of claim 1, wherein the energy router modules comprise a primary side rectifier module, a high frequency isolation transformer, and a secondary side rectifier module;
the primary side rectifier sub-module, the high-frequency isolation transformer and the secondary side rectifier sub-module are sequentially connected in series; the primary side rectifier submodule and the secondary side rectifier submodule have the same structure and are in a symmetrical structure relative to the high-frequency isolation transformer.
4. The energy router based distribution system of claim 1, wherein the primary side rectifier sub-module comprises a three-phase bridge rectifier unit, a bypass unit, a direct current filter unit, a power flow control unit and a single-phase H-bridge power unit;
the input end of the three-phase bridge type rectifying unit is connected with the commercial power grid, and the output end of the three-phase bridge type rectifying unit is respectively connected with the input end of the bypass unit and the input end of the direct current filtering unit; the output end of the bypass unit and the output end of the direct current filter unit are both connected with the input end of the power flow control unit, the output end of the power flow control unit is connected with the input end of the single-phase H-bridge power unit, and the output end of the single-phase H-bridge power unit is connected with the high-frequency isolation transformer.
5. The energy router-based power distribution system of claim 4, wherein the bypass unit comprises a bypass switch.
6. The energy router-based power distribution system of claim 1, further comprising: a distributed power supply and switch;
the distributed power supply is connected with the energy router through the exchanger and the direct current bus.
7. The energy router-based power distribution system of claim 6, wherein the distributed power source comprises: roof photovoltaic module and lithium iron phosphate battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010528480.4A CN111555336A (en) | 2020-06-11 | 2020-06-11 | Power distribution system based on energy router |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010528480.4A CN111555336A (en) | 2020-06-11 | 2020-06-11 | Power distribution system based on energy router |
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| CN111555336A true CN111555336A (en) | 2020-08-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824163A (en) * | 2021-09-22 | 2021-12-21 | 成都星宇融科电力电子股份有限公司 | Energy router and control method thereof |
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2020
- 2020-06-11 CN CN202010528480.4A patent/CN111555336A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113824163A (en) * | 2021-09-22 | 2021-12-21 | 成都星宇融科电力电子股份有限公司 | Energy router and control method thereof |
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