CN212085823U - Novel flexible many state switch of alternating current-direct current multiport based on MMC device - Google Patents
Novel flexible many state switch of alternating current-direct current multiport based on MMC device Download PDFInfo
- Publication number
- CN212085823U CN212085823U CN202020474670.8U CN202020474670U CN212085823U CN 212085823 U CN212085823 U CN 212085823U CN 202020474670 U CN202020474670 U CN 202020474670U CN 212085823 U CN212085823 U CN 212085823U
- Authority
- CN
- China
- Prior art keywords
- module
- direct current
- power line
- state switch
- alternating current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000002955 isolation Methods 0.000 claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 12
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Abstract
The utility model relates to a novel flexible many state switch of alternating current-direct current multiport based on MMC device, including sealing power line, AC/DC module, DC/DC module, isolation transformer, communication module, measurement module and control module, a plurality of alternating current ports realize electrical isolation through corresponding isolation transformer and corresponding AC/DC module, each AC/DC module is connected to power line direct current bus through sealing power line; the direct current port I is connected with the direct current bus of the power line through the DC/DC module and the closed power line, and the direct current port II is connected with the direct current bus of the power line through the direct current breaker and the closed power line; the AC/DC module and the DC/DC module are connected to a control module, the control module is connected to a communication module and a measuring module, the AC/DC module adopts a first modularized multi-level converter, and the DC/DC module adopts a second modularized multi-level converter. The utility model discloses a power, consumer's of different voltage classes, different electric energy nature interconnection improves greatly and joins in marriage net power supply reliability, improves the electric energy quality.
Description
Technical Field
The utility model belongs to a switching device technical field, especially a novel flexible many state switch of alternating current-direct current multiport based on MMC device.
Background
The distribution network is positioned at the tail end of a power grid, construction is often lagged, and meanwhile, new energy and power electronic loads represented by photovoltaic and wind power generation are connected in a large quantity, so that the distribution network has the problems of unreasonable structure, uneven load distribution, limited regulation and control means and unsatisfactory power quality. The flexible multi-state switch is adopted to replace a feeder line contact switch in the traditional power distribution network, so that normalized soft connection is formed among the feeder lines, the power supply mode of closed-loop design and open-loop operation of the power distribution network in a demonstration area is changed, and the power flow between the connected feeder lines is adjusted in real time according to a control instruction on the basis of a fully-controlled power electronic device, so that the trend distribution of the whole system is changed, the system has the advantages of an open-loop network and a closed-loop network, and the operation scheduling of the power distribution network is more flexible. Compared with the traditional mode based on interconnection switches, the flexible multi-state switch avoids the potential safety hazard caused by frequent displacement of the switch, can also relieve the phenomena of voltage sag and three-phase imbalance, and greatly improves the flexibility and rapidity of distribution network control. The Modular Multilevel Converter (MMC) is used as a new topological structure for realizing the multilevel converter, is formed by connecting single converter modules (SM) in series and parallel, is widely applied to the fields of medium-high voltage electric energy conversion and high-voltage direct-current transmission, and has the advantages of high modularization, long maintenance interval, low output waveform harmonic content and the like when the MMC technology is applied to a flexible multi-state switching device.
At present, the external alternating current equipment of the flexible multi-state switch device is not electrically isolated from the multi-state switch, which is not beneficial to self-protection of the multi-state switch device; the existing multi-state switch does not have a direct current port and is not suitable for interconnection of direct current equipment in the forms of photovoltaic, direct current charging piles, chemical energy storage and the like; meanwhile, the direct-current instantaneous fault half-bridge converter cannot quickly isolate faults but the full-bridge converter can quickly isolate faults, so that adverse effects caused by fault amplification are avoided, but the full-bridge converter is doubled in converter valve relative to the half-bridge converter, and therefore, the cost is higher.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a novel flexible multi-state switch device with alternating current and direct current multiports based on MMC, which can be connected with direct current equipment and alternating current equipment, wherein the direct current equipment and the alternating current equipment have various voltage levels; and has electrical isolation with the external direct current equipment and the external alternating current equipment; the device cost is reduced, and the probability of occurrence of direct current side faults is avoided.
The utility model provides a its technical problem realize through following technical scheme:
the utility model provides a novel flexible many state switch of alternating current-direct current multiport based on MMC device which characterized in that: the system comprises a closed power line, AC/DC modules, DC/DC modules, isolation transformers, a communication module, a measurement module and a control module, wherein a plurality of alternating current ports are electrically isolated from the corresponding AC/DC modules through the corresponding isolation transformers, and each AC/DC module is connected to a power line direct current bus through the closed power line; the direct current port I is connected with the direct current bus of the power line through the DC/DC module and the closed power line, and the direct current port II is connected with the direct current bus of the power line through the direct current breaker and the closed power line; the AC/DC module and the DC/DC module are connected to a control module, the control module is connected to a communication module and a measuring module, the AC/DC module adopts a first modularized multi-level converter, and the DC/DC module adopts a second modularized multi-level converter.
Moreover, the first modular multilevel converter block adopted by the AC/DC module is formed by connecting half-bridge converters SM in series.
And the second modular multilevel converter block adopted by the DC/DC module is formed by connecting DC/AC/DC converters SM in series and in parallel, the high-voltage side is connected in series, and the low-voltage side is connected in parallel.
Furthermore, the measuring module comprises an alternating voltage/current measuring module and a direct voltage/current measuring module.
The utility model discloses an advantage and beneficial effect do:
1. the utility model discloses a novel flexible many state switch device of alternating current-direct current multiport based on MMC, direct current equipment have realized that direct current equipment also can insert this many state switch device through DC/DC module or direct current circuit breaker access power line direct current generating line, and alternating current equipment passes through isolation transformer and AC/DC module access power line direct current generating line, realizes both can inserting direct current equipment and can insert alternating current equipment again.
2. The utility model discloses a novel flexible many state switch device of alternating current-direct current multiport based on MMC, AC equipment insert a plurality of and exchange the port, can realize electrical isolation through isolation transformer and this many state switch device, and DC equipment inserts the direct current port, from taking isolation transformer among the DC/AC/DC transverter SM in the DC/DC module, and external DC equipment and this many state switch device's electrical isolation realize that external DC equipment and external AC equipment all have electrical isolation.
3. The utility model discloses a novel flexible many state switch devices of alternating current-direct current multiport based on MMC, AC/DC module adopt the many level transverter of first modularization, DC/DC module adopt the many level transverter of second modularization, the many level transverter of first modularization piece that AC/DC module adopted is formed by the series connection of half-bridge transverter SM; the second modular multilevel converter block adopted by the DC/DC module is formed by connecting DC/AC/DC converters SM in series and parallel, one side is in series connection, and the other side is in parallel connection, so that the cost of the converter can be reduced.
4. The utility model discloses a novel flexible many state switch device of alternating current-direct current multiport based on MMC, power line direct current generating line to the many level transverter of first modularization, wiring between the many level transverter of second modularization, the direct current circuit breaker adopts closed power line, but the fault rate of greatly reduced direct current side, so realize the flexible many state switch device of low cost, high reliability.
5. The utility model discloses a novel alternating current-direct current multiport flexible multi-state switch device based on MMC, communication module are used for this multi-state switch device to communicate with energy management system, distribution automation system etc.; the measuring module is used for measuring all electrical quantities of the flexible multi-state switching device and is used for on-off control and electric energy metering of the converter IGBT; and the control module receives the information of the measurement module and the communication module and is used for controlling the on-off of the converter IGBT through calculation.
6. The utility model discloses a novel flexible many state switch of alternating current-direct current multiport device based on MMC has realized the interconnection of power, consumer of different voltage class, different electric energy nature after the achievement is used, is applied to the distribution network and will improves greatly and join in marriage net power supply reliability, improves electric energy quality.
Drawings
Fig. 1 is a schematic block diagram of the circuit of the present invention;
FIG. 2 is a schematic circuit diagram of an AC/DC module;
fig. 3 is a schematic circuit diagram of a half-bridge converter SM of the AC/DC module;
FIG. 4 is a schematic circuit diagram of a DC/DC module;
fig. 5 is a schematic circuit diagram of the inverter SM of the DC/DC module.
Detailed Description
The present invention will be described in further detail with reference to specific examples, which are provided for illustrative purposes only, and are not intended to be limiting, and the scope of the present invention should not be limited thereby.
The utility model provides a novel flexible many state switch of alternating current-direct current multiport based on MMC device which characterized in that: the system comprises a closed power line, AC/DC modules, DC/DC modules, isolation transformers, a communication module, a measurement module and a control module, wherein a plurality of alternating current ports are electrically isolated from the corresponding AC/DC modules through the corresponding isolation transformers, and each AC/DC module is connected to a power line direct current bus through the closed power line; the direct current port I is connected with the direct current bus of the power line through the DC/DC module and the closed power line, and the direct current port II is connected with the direct current bus of the power line through the direct current breaker and the closed power line; the AC/DC module and the DC/DC module are connected to a control module, the control module is connected to a communication module and a measuring module, the AC/DC module adopts a first modularized multi-level converter, and the DC/DC module adopts a second modularized multi-level converter. The measuring module comprises an alternating voltage/current measuring module and a direct voltage/current measuring module.
The first modular multilevel converter block used by the AC/DC module is formed by connecting half-bridge converters SM in series, as shown in fig. 2 and 3. The second modular multilevel converter block adopted by the DC/DC module is composed of DC/AC/DC converters SM connected in series and parallel, with the high-voltage side being in series and the low-voltage side being in parallel, as shown in fig. 4 and 5.
The direct current equipment is connected to the direct current bus of the power line through the DC/DC module or the direct current breaker, so that the direct current equipment can be connected to the multi-state switch device, and the alternating current equipment is connected to the direct current bus of the power line through the isolation transformer and the AC/DC module, so that the direct current equipment and the alternating current equipment can be connected.
The alternating current equipment is connected with a plurality of alternating current ports, can realize electrical isolation with the multi-state switching device through the isolation transformer, the direct current equipment is connected with the direct current ports, the DC/AC/DC converter SM in the DC/DC module is provided with the isolation transformer, the external direct current equipment is electrically isolated from the multi-state switching device, and the external direct current equipment and the external alternating current equipment are electrically isolated.
The AC/DC module adopts a first modular multilevel converter, the DC/DC module adopts a second modular multilevel converter, and the first modular multilevel converter block adopted by the AC/DC module is formed by connecting half-bridge converters SM in series; the second modular multilevel converter block adopted by the DC/DC module is formed by connecting DC/AC/DC converters SM in series and parallel, one side is in series connection, and the other side is in parallel connection, so that the cost of the converter can be reduced.
The wiring between the power line direct current bus and the first modular multilevel converter, the wiring between the second modular multilevel converter and the direct current breaker adopts a closed power line, so that the fault rate of a direct current side can be greatly reduced, and the flexible multi-state switching device with low cost and high reliability is realized.
The communication module is used for communicating the multi-state switch device with an energy management system, a power distribution automation system and the like; the measuring module is used for measuring all electrical quantities of the flexible multi-state switching device and is used for on-off control and electric energy metering of the converter IGBT; and the control module receives the information of the measurement module and the communication module and is used for controlling the on-off of the converter IGBT through calculation.
Although the embodiments of the present invention and the accompanying drawings have been disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, alterations, and modifications are possible without departing from the spirit and scope of the invention and the appended claims, and thus the scope of the invention is not limited to the embodiments and drawings disclosed.
Claims (4)
1. The utility model provides a novel flexible many state switch of alternating current-direct current multiport based on MMC device which characterized in that: the system comprises a closed power line, AC/DC modules, DC/DC modules, isolation transformers, a communication module, a measurement module and a control module, wherein a plurality of alternating current ports are electrically isolated from the corresponding AC/DC modules through the corresponding isolation transformers, and each AC/DC module is connected to a power line direct current bus through the closed power line; the direct current port I is connected with the direct current bus of the power line through the DC/DC module and the closed power line, and the direct current port II is connected with the direct current bus of the power line through the direct current breaker and the closed power line; the AC/DC module and the DC/DC module are connected to a control module, the control module is connected to a communication module and a measuring module, the AC/DC module adopts a first modularized multi-level converter, and the DC/DC module adopts a second modularized multi-level converter.
2. The novel MMC-based AC-DC multiport flexible multi-state switch device of claim 1, characterized in that: the first modular multilevel converter block adopted by the AC/DC module is formed by connecting half-bridge converters SM in series.
3. The novel MMC-based AC-DC multiport flexible multi-state switch device of claim 1, characterized in that: the second modular multilevel converter block adopted by the DC/DC module is formed by connecting DC/AC/DC converters SM in series and parallel, wherein one side is connected in series, and the other side is connected in parallel.
4. The novel MMC-based AC-DC multiport flexible multi-state switch device of claim 1, characterized in that: the measuring module comprises an alternating voltage/current measuring module and a direct voltage/current measuring module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020474670.8U CN212085823U (en) | 2020-04-03 | 2020-04-03 | Novel flexible many state switch of alternating current-direct current multiport based on MMC device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020474670.8U CN212085823U (en) | 2020-04-03 | 2020-04-03 | Novel flexible many state switch of alternating current-direct current multiport based on MMC device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212085823U true CN212085823U (en) | 2020-12-04 |
Family
ID=73563974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020474670.8U Active CN212085823U (en) | 2020-04-03 | 2020-04-03 | Novel flexible many state switch of alternating current-direct current multiport based on MMC device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212085823U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113162447A (en) * | 2021-04-26 | 2021-07-23 | 清华大学 | Power electronic transformer based on step-down AC-DC and medium frequency isolated DC-DC |
-
2020
- 2020-04-03 CN CN202020474670.8U patent/CN212085823U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113162447A (en) * | 2021-04-26 | 2021-07-23 | 清华大学 | Power electronic transformer based on step-down AC-DC and medium frequency isolated DC-DC |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10523131B2 (en) | Reconfigurable MMC sub-module unit and control unit thereof | |
| CN103441691B (en) | A kind of mode of resonance electronic power convertor and converter device | |
| CN112398308B (en) | Multi-port energy router and control system and control method thereof | |
| CN103001242B (en) | A kind of HVDC based on modularization multi-level converter holds concurrently UPFC system | |
| CN110970922A (en) | Alternating current-direct current hybrid distributed renewable energy system | |
| CN102820672B (en) | Flexible direct current transmission system for connecting alternating current networks with different voltage classes | |
| CN108306281A (en) | A kind of four Port Translation device of part isolated form and its control method based on two-way full-bridge DC/DC converters | |
| CN209217732U (en) | Alternating current-direct current mixing micro-capacitance sensor energy-storage system | |
| CN110311381A (en) | A kind of alternating current-direct current mixing grid power electronic transformer passing through DC Line Fault | |
| CN109980948A (en) | A kind of five port electric power electric transformer of three Coupling Between Phases | |
| CN103715930A (en) | Method for increasing capacity of flexible direct-current power transmission system and apparatus thereof | |
| CN105429177B (en) | A kind of Modular photovoltaic energy-storage system | |
| CN112653149A (en) | High-power electric energy router suitable for low-voltage distribution network | |
| CN112886594A (en) | AC/DC power supply structure of data center | |
| CN116488224A (en) | Multiport alternating current-direct current hybrid converter device and multiport alternating current-direct current hybrid system | |
| CN213585162U (en) | AC/DC power supply structure of data center | |
| CN113036800B (en) | Flexible interconnection substation structure and control method | |
| CN212085823U (en) | Novel flexible many state switch of alternating current-direct current multiport based on MMC device | |
| CN113890122A (en) | Alternating current-direct current multiport power distribution system for office residential area | |
| CN112152261A (en) | Power distribution network system based on power electronic transformer alternating current-direct current hybrid networking | |
| CN112134286A (en) | Alternating current-direct current hybrid micro-grid | |
| CN112467997B (en) | Flexible substation topology circuit and control method thereof | |
| CN212012496U (en) | Multi-port non-latching direct-current autotransformer | |
| Miao et al. | Research on power electronic transformer applied in AC/DC hybrid distribution networks | |
| Chong et al. | A Power Conversion System For Large-Scale Reversible SOFC Energy Storage System |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |