CN110492514A - Solid-state transformer topology race and design method applied to alternating current-direct current mixing power distribution network - Google Patents
Solid-state transformer topology race and design method applied to alternating current-direct current mixing power distribution network Download PDFInfo
- Publication number
- CN110492514A CN110492514A CN201910599364.9A CN201910599364A CN110492514A CN 110492514 A CN110492514 A CN 110492514A CN 201910599364 A CN201910599364 A CN 201910599364A CN 110492514 A CN110492514 A CN 110492514A
- Authority
- CN
- China
- Prior art keywords
- level
- topology
- dab
- mmc
- submodule
- 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.)
- Pending
Links
Classifications
-
- 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
-
- 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
- H02J5/00—Circuit arrangements for transfer of electric power between ac networks and dc networks
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/66—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal
- H02M7/68—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters
- H02M7/72—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/79—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/797—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention provides a kind of solid-state transformer topology race applied to straight exchange mixing power distribution network, wherein: the input terminal of the double active bridging parallel operations of the submodule DC terminal and isolated form of modularization multi-level converter interconnects to form modular construction, the output end parallel connection of the double active bridging parallel operations of multiple isolated forms forms low-voltage direct bus, three-phase full-bridge inverter is accessed on low-voltage direct bus, straightening stream in offer, middle pressure exchange, low-voltage direct, four generic port of low-voltage alternating-current, to be suitable for the polymorphic alternating current-direct current mixing power distribution network interconnection of multi-voltage grade.The present invention also provides a kind of design methods of above-mentioned solid-state transformer topology race, to reduce submodule quantity and high frequency transformer quantity in solid-state transformer device under the premise of obtaining catering to the solid-state transformer device of special scenes demand, reduce volume and cost.
Description
Technical field
The present invention relates to the fields such as intelligent power distribution network technology, power electronic technique in electric system, and in particular, to a kind of
Modular solid-state transformer topology race and design method applied to alternating current-direct current mixing power distribution network.
Background technique
The following distribution system have high proportion distributed generation resource and flexible load (electric car, distributed energy storage) access,
The features such as high power quality of user and the customized demand of a variety of electrical energy forms, and the proposition of ubiquitous electric power Internet of Things, so that with electricity
Net be core the energy resource system of new generation that efficiently merges of various energy resources to power distribution network it is flexible it is controllable, elasticity is strong proposes more
High requirement.However, the operational mode of conventional electrical distribution net is substantially dominated with supplier, based on single radial power supply, distribution
One secondary control equipment (Loading voltage regulator, interconnection switch etc.) ability of regulation and control shortcoming, it is difficult to meet renewable energy and load is frequent
The high-precision real time execution of power distribution network optimizes demand when fluctuation, and in the planning and designing stage of distribution and operational management, not
Consider the access of distributed generation resource.With being continuously increased for distributed generation resource access amount, more there are the quick universal of electric car, storage
Can and controllable burden persistently increase, existing power distribution network framework be difficult to meet new energy consumption, flexibly controllable, elasticity it is strong and
Requirement of the user to environmental protection, power supply reliability, power quality and good service.
Since single AC or DC distribution all has its limitation, using novel full control flexibility power distribution equipment as core
Flexible alternating current-direct current mixing distribution system be the following power distribution network one of development trend.It is compared with conventional electrical distribution net, alternating current-direct current is mixed
It closes power distribution network and has the advantage that the ability for having extensive consumption distributed generation resource and flexible load；Have voltage transformation, electricity
It is a variety of adaptive that energy quality comprehensive controls, electric energy conversion exchanges selection, energy smooth optimization and information exchange etc. with access, electric energy
Control characteristic reduces the complexity of distribution network system composition；Reduce device category, the quantity of dispersion, improving operation can
Control property and maintainability.Core apparatus of the solid-state transformer as alternating current-direct current mixing power distribution network, will be in alternating current-direct current mixing power distribution network
Replace traditional distribution transformer at key node, need to meet multiport, high no-load voltage ratio, multivoltage form, Fault Isolation, efficiently
The primary demands such as electric energy transmission, and realize that multidirectional power is controllable, provides the Premium Features such as a variety of plug and play interfaces.
Through retrieving, plum is glad etc. " the electric power electric transformer research towards mesohigh intelligent distribution network " delivered, " power grid
Technology " (2013), it proposes a kind of based on modularization multi-level converter (MMC) and the double active bridging parallel operations (DAB) of isolated form
Electric power electric transformer topological structure, realize the interconnection of a variety of alternating current-direct current power distribution networks.The electric power electric transformer topology has height
Pressure exchange side modularization multi-level converter (MMC), the intermediate input series connection isolation type DC-DC converter of output-parallel and low
The three-phase four-leg inverter of side is pressed to constitute.High-pressure side three-phase alternating current is transformed into high straightening by modularization multi-level converter
Stream；The high-voltage dc voltage of MMC converter is transformed to low-voltage direct by intermediate input series output parallel type DC-DC converter
Voltage, for the use of low-pressure side three-phase inverter, meanwhile, intermediate DC-DC converter also achieves high-pressure side and low-pressure side
Electrical isolation function.Compared to three-phase half-bridge cascade connection type electric power electric transformer, which improves DC output voltage quality,
The dosage of high frequency transformer and electronic power switch device is significantly reduced, but is needed between the middle-voltage network and secondary network of the topology
Power transfer is realized by middle pressure DC bus, causes the current stress of MMC switching device larger.In addition, middle pressure DC bus
It is upper additionally series capacitance to increase installation cost to realize MMC and DAB.Therefore there are biggish optimization spaces for the topology.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of consolidating applied to alternating current-direct current mixing power distribution network
State transformer topology race and design method have using the submodule unit and isolated form of modularization multi-level converter (MMC) are double
The mode of source bridging parallel operation (DAB) element-interconn ection provides middle straightening stream, middle pressure to realize the power transfer between low and medium voltage distribution network
Exchange, low-voltage direct, four generic port of low-voltage alternating-current, to be suitable for the polymorphic alternating current-direct current mixing power distribution network interconnection of multi-voltage grade.
To achieve the above object, the invention adopts the following technical scheme:
According to the first aspect of the invention, a kind of solid-state transformer topology applied to straight exchange mixing power distribution network is provided
Race, including the double active bridging parallel operations (DAB) of modularization multi-level converter (MMC), multiple isolated forms and three phase full bridge inversion
Device, wherein
The submodule DC terminal of the modularization multi-level converter (MMC) and the double active bridging parallel operations of the isolated form
(DAB) input terminal interconnects to form modular construction, and the output end of the double active bridging parallel operations (DAB) of multiple isolated forms is in parallel
Low-voltage direct bus is formed, accesses the three-phase full-bridge inverter on the low-voltage direct bus, in which:
Straightening flow port and middle pressure AC port in modularization multi-level converter (MMC) offer, medium pressure are handed over
Flow port presses AC distribution net in being used to connect, and medium pressure DC port is for straightening in straightening current load in connecting and realization
Flexible interconnection between stream power distribution network；
Double active bridging parallel operation (DAB) output ends of the isolated form are in parallel, form low-voltage direct port, the low-voltage direct
Port is for connecting the three-phase full-bridge inverter and low-voltage direct power grid；
The low-voltage direct bus constitutes low-voltage alternating-current port, the low-voltage alternating-current end by the three-phase full-bridge inverter
Mouth with low-voltage alternating-current power distribution network for being connected；
It can be suitably used for the polymorphic alternating current-direct current mixing power distribution network interconnection of multi-voltage grade by above-mentioned four kinds of ports.
Preferably, the modularization multi-level converter (MMC) includes one or more modularization level converters (MMC)
Submodule, when for multiple modularization level converter (MMC) submodules, the multiple modularization multi-level converter (MMC)
Submodule input terminal multi-level inverter bridge arm in series, each submodule DC port have with corresponding isolated form pair
Source bridging parallel operation subelement is connected.
Preferably, the double active bridging parallel operations (DAB) of the isolated form include that the double active bridgings of one or more isolated forms change
Device (DAB) subelement, when active bridging parallel operation (DAB) subelements double using multiple isolated forms, each isolated form is double to be had
The input terminal of source bridging parallel operation (DAB) subelement is connected with respective modules multilevel converter (MMC) DC terminal, and output end is simultaneously
Connection forms the low-voltage direct bus.
Preferably, modularization level converter (MMC) the submodule topology is topological using two level topology or more level,
Wherein, the two level topology includes that how electric bridge-type topology and semi-bridge type topology, more level topologys are using monopole type
Flat topology or ambipolar more level topologys.
Preferably, the more level topologys of the monopole type are described ambipolar more by being converted in exchange side series connection capacitance
Level topology.
Preferably, double active bridging parallel operation (DAB) subelements of the isolated form are by input terminal converter, high-frequency isolation transformation
Device, output end inverter composition, the high-frequency isolation transformer are connected to the input terminal converter, the output end inverter
Between.
Preferably, modularization multi-level converter (MMC) submodule and double active bridging parallel operation (DAB) of isolated form
The input terminal converter topology of unit is interconnected in DC side, and the two topology level number matches；Wherein: passing through the Modular electrical
The capacitor of flat inverter (MMC) submodule realizes the submodule and the isolated form of the modularization multi-level converter (MMC)
The interconnection of double active bridging parallel operations (DAB).
Preferably, the input terminal converter topology is using two Level Full Bridges topology or more level topology, wherein described more
Level topology includes the more level topologys of capacitance type or ambipolar more level topologys.
Preferably, the high-frequency isolation transformer uses single-phase high frequency isolating transformer or three-phase high-frequency isolation transformer.
Preferably, the output end inverter topology of double active bridging parallel operation (DAB) module topologies of the isolated form is simultaneously
Connection forms low-voltage direct bus, and two Level Full Bridges topology or more level topology can be used in the output end inverter topology, wherein
More level topologys include the more level topologys of capacitance type or ambipolar more level topologys；The low-voltage direct bus according to
Port is needed using the very bipolar or pseudo- bipolar mode of connection.
According to the second aspect of the invention, the solid-state transformer for providing one such application in straight exchange mixing power distribution network is opened up
Flutter the design method of race, comprising:
Submodule is divided into two level according to the difference of modularization level converter (MMC) submodule level quantity by S1
Module and more level submodules；Wherein,
The two level submodule is divided into half-bridge module and full-bridge modules；
It is more that more level submodules are divided into the more level topologys of monopole type, ambipolar more level topologys and capacitance type
Level topology three classes；
For modularization level converter (MMC) submodule, using two level topology or the more level of monopole type
Topology；
For active bridging parallel operation (DAB) submodules double for the isolated form, input terminal and output end use bridge-type
The more level topologys of topology, capacitance type or ambipolar more level topologys；
According to the above classification and solid-state transformer design requirement determine modularization level converter (MMC) submodule and
Double active bridging parallel operation (DAB) input/output terminals of the isolated form are specifically topological, wherein the modularization level converter
(MMC) submodule and double active bridging parallel operation (DAB) the unit input terminals of isolated form are realized in DC side and are interconnected, to guarantee switching tube
Stress levels are consistent, and the topological level number of the two needs to match, and the output end of the double active bridging parallel operations (DAB) of the isolated form is simultaneously
Connection forms low-voltage direct bus；
S2, according to double active bridging parallel operation (DAB) the medium-high frequency isolating transformer numbers of phases of the isolated form, by the high frequency every
Be divided into single-phase high frequency isolating transformer and three-phase high-frequency isolation transformer from transformer point (DAB), wherein the three-phase high frequency every
Three from company, transformer institute input terminals are separately connected A, B, C three-phase modular level converter (MMC) bridge arm submodule；
It is determined according to the above classification and solid-state transformer design requirement high in the double active bridging parallel operations (DAB) of the isolated form
Frequency isolating transformer type；
S3, according to determining modularization level converter (MMC) submodule topology, the double active bridgings of the isolated form
Parallel operation (DAB) input/output terminal topology and high-frequency isolation transformer type, combination obtain complete solid-state transformer topology, and root
The design of associated electrical parameters is completed according to solid-state transformer design requirement, determining port connection mode, (low-voltage direct side is very bipolar
Or pseudo- bipolar), complete switching device type selecting；
To complete to be applied to the solid-state transformer topology race design of straight exchange mixing power distribution network.
Compared with prior art, the present invention have it is following at least one the utility model has the advantages that
1, the existing electric power electric transformer topology based on modularization multi-level converter (MMC) is female by middle straightening stream
Line carries out the power transfer between middle low voltage network, and present invention optimizes energy transmission paths, and low-voltage direct side power is via mould
Block multilevel converter submodule DC side flows into the double active bridging parallel operations (DAB) of isolated form, so that the bridge of MMC be effectively reduced
Arm current dc component thereby reduces the current stress of MMC switching device.
2, existing topology passes through in the middle isolation type DC-DC converter for pressing DC side that input series and output parallel is additionally arranged
Realize the conversion of mesolow direct current, and the present invention realizes designed modularization multi-level converter (MMC) by MMC submodule capacitor
Submodule and the double active bridging parallel operations (DAB) of isolated form interconnection, to form new solid-state transformer structural unit, module
Change degree is higher, and cost is lower.
3, the present invention provides complete set for the New Solid transformer topology based on modularization multi-level converter
Topological structure method can carry out submodule construction side inside solid-state transformer according to the building method under different application scene
The design of case, to complete the solid-state transformer topology race design for being applied to straight exchange mixing power distribution network.
4, the more level submodule topological structures and three-phase high-frequency isolation transformer that the present invention is constructed may be incorporated for dropping
Low solid-state transformer topology Neutron module element number and required high frequency transformer quantity reduce installation cost and volume.
5, the present invention in DAB unit output end by, using ambipolar more level topologys, only needing single device can be realized
The very bipolar mode of connection of low-voltage direct bus port, significantly improves low-voltage direct side reliability.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the solid-state transformer basic framework schematic diagram of one embodiment of the invention；
Fig. 2 is that modularization multi-level converter (MMC) submodule topology and isolated form are double active in one embodiment of the invention
Bridge (DAB) unit topological sorting schematic diagram；
Fig. 3 is one embodiment of the invention medium-high frequency isolating transformer topological sorting schematic diagram；
Fig. 4 is two level submodule topology combinations one in one embodiment of the invention；
Fig. 5 is two level submodule topology combinations two in one embodiment of the invention；
Fig. 6 is three level submodule topology combinations one in one embodiment of the invention；
Fig. 7 is three level submodule topology combinations two in one embodiment of the invention；
Fig. 8 is three level submodule topology combinations three in one embodiment of the invention；
Fig. 9 is three level submodule topology combinations four in one embodiment of the invention.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
The embodiment of the present invention proposes a kind of solid-state transformer topology race applied to alternating current-direct current mixing power distribution network, the topology
Race reduces the bridge of modularization multi-level converter (MMC) by power transfer between submodule DC side progress middle low voltage network
Arm DC component, optimizes switch stress；The double active bridges of the submodule unit and isolated form of modularization multi-level converter (MMC)
Converter (DAB) unit directly interconnects, and eliminates the series capacitance of middle pressure DC side, reduces device volume and cost；It provides
Middle straightening stream, middle pressure exchange, low-voltage direct, four generic port of low-voltage alternating-current are mixed to be suitable for the polymorphic alternating current-direct current of multi-voltage grade
Close power distribution network interconnection.
As shown in Figure 1, the solid-state transformer topology race applied to alternating current-direct current mixing power distribution network in a specific embodiment
Basic framework schematic diagram.Solid-state transformer topology race in the embodiment is by modularization multi-level converter (MMC), multiple isolation
The double active bridging parallel operations (DAB) of type and three-phase full-bridge inverter are constituted.The topology race passes through modularization multi-level converter first
(MMC) straightening flow port and the middle connection for pressing pressure AC distribution net and middle straightening stream power distribution network in AC port realization in providing,
Simultaneously secondly by double active bridging parallel operation (DAB) connections of the submodule unit and isolated form of modularization multi-level converter (MMC)
By double active bridging parallel operation (DAB) the output end parallel connections of isolated form to provide low-voltage direct port, middle-voltage network and low-pressure direct are realized
The interconnection for flowing power distribution network provides low-voltage alternating-current port finally by connection three-phase full-bridge inverter, realizes low-voltage direct power distribution network
With the interconnection of low-voltage alternating-current power distribution network.The application of topological race is, it can be achieved that multi-voltage grade and a variety of friendships are straight in through this embodiment
The power distribution network of manifold state interconnects, and lays equipment basis for the building of the following intelligent distribution network.
In a preferred embodiment, double active bridging parallel operation (DAB) subelements of isolated form are by input terminal converter, high-frequency isolation
Transformer, output end inverter composition, high-frequency isolation transformer are connected between input terminal converter, output end inverter.Mould
The input terminal converter of block multilevel converter (MMC) submodule and double active bridging parallel operation (DAB) subelements of isolated form is opened up
It flutters and is interconnected in DC side, the two topology level number matches；It is realized by the capacitor of modularization level converter (MMC) submodule
The interconnection of the double active bridging parallel operations (DAB) of the submodule and isolated form of modularization multi-level converter (MMC).Further, defeated
Enter to hold converter topology can be using two Level Full Bridges topology or more level topology, wherein more level topologys include capacitance
The more level topologys of type or ambipolar more level topologys.High-frequency isolation transformer can use single-phase high frequency isolating transformer or three-phase
High-frequency isolation transformer.The output end inverter parallel connection of double active bridging parallel operation (DAB) module topologies of isolated form forms low-pressure direct
Bus is flowed, output end inverter topology is using two Level Full Bridges topology or more level topology, wherein more level topologys include blocking
Capacitive more level topologys or ambipolar more level topologys；Low-voltage direct bus is according to port using very bipolar or pseudo- bipolar wiring
Mode.
Based on above-mentioned modular solid-state transformer topology framework, by the way that different submodule topology units are classified, analysis
The property requirements of MMC submodule and DAB unit, and appropriate combination is selected, it constructs suitable for alternating current-direct current mixing power distribution network
Solid-state transformer topology race.Specifically, including following design method:
First according to the difference of submodule level quantity, submodule is divided into two level submodules and more level submodules.
Wherein, two level submodules can be divided into half-bridge module and full-bridge modules；More level submodules according to exchange output polarity not
Together, monopole type and ambipolar can be divided into, in addition, more level topologys of monopole type can be by connecting blocking electricity in exchange side
Hold, be converted to ambipolar topology, thus can be classified as in total monopole type more level topology, ambipolar more level topologys and every
Straight capacitive more level topology three classes.For MMC submodule, from module boosting demand for, do not need ambipolar open up
It flutters, but can also according to the needs of actual conditions, using ambipolar topology, therefore two level topology or single can be used in MMC submodule
The more level topologys of polar form.For DAB submodule, exchange is flanked into high frequency transformer, if alternating voltage is inclined with direct current
Set, it will reduce transformer utilization factor, therefore DAB input terminal need to using bridge-type topology, capacitance type more level topology or
Ambipolar more level topologys.MMC submodule and DAB unit input terminal are realized in DC side to be interconnected, to guarantee switching tube pressure resistance etc.
Grade is consistent, and the topological level number of the two needs to match, for example, three level MMC submodules need and three level DAB interconnection, five level
MMC submodule needs and five level DAB interconnection, and so on.The output end parallel connection of DAB forms low-voltage direct bus, and biography can be used
The full bridge structure of system, the more level topologys of capacitance type or ambipolar more level topologys, the latter, which can also be used, only needs set of device
The very ambipolar mode of connection can be provided.
Secondly, according to double active bridging parallel operation (DAB) the medium-high frequency isolating transformer numbers of phases of isolated form, it can be by high-frequency isolation
Transformer is divided into single-phase high frequency isolating transformer and three-phase high-frequency isolation transformer, wherein company, three-phase high-frequency isolation transformer institute
Three input terminals are separately connected A, B, C three-phase MMC bridge arm submodule.Complexity, but energy are controlled using three-phase high-frequency isolation transformer
High-frequency isolation transformer quantity is effectively reduced, improves power density.
For the solid-state transformer topology using two level submodules, modularization multi-level converter (MMC) submodule can
Semi-bridge type topology or bridge-type topology are selected, the double active bridging parallel operation input/output terminal topologys of isolated form need to select full-bridge submodule
Single-phase or three-phase transformer can be selected in block, high-frequency isolation transformer, and three-phase transformer primary side input terminal is connect respectively in A, B, C tri-
At phase submodule.
For the solid-state transformer topology using more level submodules, with the solid-state transformer topology structure of three level submodules
For making.Common several three-level topologies are divided into three classes first, monopole type topology includes half-bridge cascade connection type topology, diode
Clamper type three-level topology；Capacitance type topology includes the half-bridge cascade connection type topology of series connection capacitance；Ambipolar topology packet
Include diode clamp bit-type three-level topology (neutral point output).
It is then determined that MMC submodule topology takes monopole type topological, DAB input terminal topology take ambipolar topology and every
Straight capacitive topology, DAB output end topology can take full bridge structure or three-level topology as needed, and full-bridge topology device is more
Few, three-level topology can realize the very bipolar mode of connection.
Using more three-level topologies, more solid-state transformer submodule topologys can be constructed.
Using the topology of five level or other level, the present embodiment above method also can be used and realize solid-state transformer topology
Construction.
Specifically, the above embodiment of the present invention is by using ambipolar more level topologys, Ke Yishi in DAB unit output end
The very bipolar mode of connection of existing low-voltage direct bus port, significantly improves low-voltage direct side reliability.
It is as follows for solid-state transformer inside submodule topology and high frequency transformer topology, respective advantage:
Two level half-bridge submodules are commonly used in MMC submodule, it is advantageous that switching tube negligible amounts used, loss
It is low, it reduces costs and volume；
Two Level Full Bridge submodules can be used for MMC submodule and DAB input/output terminal, excellent compared to half-bridge submodule
Gesture is have good fault ride-through capacity, can block direct fault current by being latched.
The more level submodule topologys of monopole type include half-bridge cascade connection type topology and diode clamp bit-type three-level topology, usually
For MMC submodule, MMC submodule number can be effectively reduced.
Ambipolar more level submodule topologys include diode clamp bit-type three-level topology (neutral point output), are commonly used in
DAB input/output terminal, it is advantageous that du/dt is reduced, to reduce harmonic distortion rate；The voltage of switching device in topology
The half of stress DC voltage, therefore single DAB module voltage grade can be improved, to reduce DAB number of modules.
The more level submodules of capacitance type include the half-bridge cascade connection type topology of series connection capacitance, defeated commonly used in DAB
Enter output end, it is advantageous that du/dt is reduced, to reduce harmonic distortion rate；The voltage stress of switching device in topology
DC voltage it is general, therefore single DAB module voltage grade can be improved, to reduce DAB number of modules；Side is exchanged to be added
Capacitance, can eliminate the DC component in high frequency transformer.
For high-frequency isolation transformer compared to traditional transformer, working frequency is higher, and volume is smaller, is widely used in solid-state change
In depressor.Wherein, the control of single-phase high frequency isolating transformer is relatively simple；The control of three-phase high-frequency isolation transformer is relative complex, but
It is that can reduce high-frequency isolation converter quantity.
Specifically, referring to Fig.1 shown in -9, in one embodiment:
As shown in Figure 1, for the solid-state transformer basic framework schematic diagram in the present embodiment, in which: SM refers to MMC converter
In submodule, DAB refers to DAB power converter cells, and the two is realized in DC side and interconnected, and DAB output end parallel connection forms low-pressure direct
Bus is flowed, inverter can be accessed on the bus and forms low-voltage alternating-current bus.Therefore, pass through the combination of MMC and DAB, the solid-state
Transformer presses exchange, middle straightening stream, low-voltage alternating-current, four ports of low-voltage direct in being formed.
As shown in Fig. 2, being the submodule topological sorting schematic diagram of the present embodiment, in which: the submodule SM of MMC can be used two
Level topology and monopole type three-level topology, two level topologys include semi-bridge type topology and bridge-type topology, three level of monopole type
Topology includes half-bridge cascade connection type topology, diode clamp bit-type three-level topology.And DAB converter input terminal and output end inverter
The more level topologys of bridge-type topology, capacitance type and ambipolar more level topologys, the more level topologys of capacitance type can be used
Half-bridge cascade connection type topology including capacitance of connecting, ambipolar more level topologys include diode clamp bit-type three-level topology
(neutral point output).
As shown in figure 3, being the high-frequency isolation transformer topological sorting schematic diagram of the present embodiment, high-frequency isolation transformer can be with
It is divided into single-phase high frequency isolating transformer and three-phase high-frequency isolation transformer, wherein three, company, three-phase high-frequency isolation transformer institute is defeated
Enter end and is separately connected A, B, C three-phase bridge arm submodule.
As shown in figure 4, being two level submodule topology combinations, one schematic diagram of the present embodiment, in which: MMC submodule
The side SM uses single-phase high frequency isolating transformer, input terminal using two level of semi-bridge type or bridge-type two level topology, DAB converter
Bridge-type topology is all made of with output end.
As shown in figure 5, being two level submodule topology combinations, two schematic diagram of the present embodiment, in which: MMC submodule
The side SM uses three-phase high-frequency isolation transformer, input terminal using two level of semi-bridge type or bridge-type two level topology, DAB converter
It is all made of bridge-type topology with output end, using three-phase high-frequency isolation transformer.
As schemed, 6 show, are three level submodule topology combinations, one schematic diagram of the present embodiment, in which: MMC submodule
The side SM use half-bridge cascade connection type three-level topology or diode clamp bit-type three-level topology, DAB converter using single-phase high frequency every
From transformer, input terminal cascades three-level topology or diode clamp bit-type three-level topology using the half-bridge of series connection capacitance
(neutral point output), output end is using bridge-type topology.
As schemed, 7 show, are three level submodule topology combinations, two schematic diagram of the present embodiment, in which: MMC submodule
The side SM use half-bridge cascade connection type three-level topology or diode clamp bit-type three-level topology, DAB converter using single-phase high frequency every
From transformer, input terminal and output end are all made of the half-bridge cascade three-level topology or diode clamp bit-type three of series connection capacitance
Level topology (neutral point output), output end midpoint provide outlet, realize the very bipolar mode of connection.
As schemed, 8 show, are three level submodule topology combinations, three schematic diagram of the present embodiment, in which: MMC submodule
The side SM use half-bridge cascade connection type three-level topology or diode clamp bit-type three-level topology, DAB converter using three-phase high frequency every
From transformer, input terminal cascades three-level topology or diode clamp bit-type three-level topology using the half-bridge of series connection capacitance
(neutral point output), output end is using bridge-type topology.
As schemed, 9 show, are three level submodule topology combinations, four schematic diagram of the present embodiment, in which: MMC submodule
The side SM use half-bridge cascade connection type three-level topology or diode clamp bit-type three-level topology, DAB converter using three-phase high frequency every
From transformer, input terminal and output end are all made of the half-bridge cascade three-level topology or diode clamp bit-type three of series connection capacitance
Level topology (neutral point output), output end midpoint provide outlet, realize the very bipolar mode of connection.
As seen from the above-described embodiment, the present embodiment is from the double active bridgings of modular multilevel (MMC) submodule and isolated form
Parallel operation (DAB) two dimensions of topology are set out, and by way of permutation and combination, construct consolidating suitable for alternating current-direct current mixing power distribution network
State transformer topology race, to reduce solid-state under the premise of obtaining catering to the solid-state transformer device of special scenes demand and become
Submodule quantity and high frequency transformer quantity in depressor device reduce volume and cost, are the modularization under different application scene
The type selecting of solid-state transformer topology lays the foundation.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (10)
1. a kind of solid-state transformer topology applied to straight exchange mixing power distribution network, it is characterised in that: including modular multilevel
The double active bridging parallel operations (DAB) of inverter (MMC), multiple isolated forms and three-phase full-bridge inverter, wherein
The submodule DC terminal of the modularization multi-level converter (MMC) and the double active bridging parallel operations (DAB) of the isolated form
Input terminal interconnect to form modular construction, the output end parallel connection of the double active bridging parallel operations (DAB) of multiple isolated forms is formed
Low-voltage direct bus accesses the three-phase full-bridge inverter on the low-voltage direct bus, and low-voltage direct side power is via described
Modularization level converter (MMC) submodule DC terminal flows into the double active bridging parallel operations (DAB) of the isolated form；Wherein:
Straightening flow port and middle pressure AC port in modularization multi-level converter (MMC) offer, medium pressure exchange end
Mouth presses AC distribution net in being used to connect, and medium pressure DC port is matched for straightening stream in straightening current load in connection and realization
Flexible interconnection between power grid；
Double active bridging parallel operation (DAB) output ends of the isolated form are in parallel, form low-voltage direct port, the low-voltage direct port
For connecting the three-phase full-bridge inverter and low-voltage direct power grid；
The low-voltage direct bus constitutes low-voltage alternating-current port by the three-phase full-bridge inverter, and the low-voltage alternating-current port is used
It is connected in low-voltage alternating-current power distribution network；
It can be suitably used for the polymorphic alternating current-direct current mixing power distribution network interconnection of multi-voltage grade by above-mentioned four kinds of ports.
2. a kind of solid-state transformer topology applied to straight exchange mixing power distribution network according to claim 1, feature exist
In: the modularization multi-level converter (MMC) include one or more modularization level converter (MMC) submodules, when for
When multiple modularization level converter (MMC) submodules, the multiple modularization multi-level converter (MMC) submodule input terminal
Multi-level inverter bridge arm in series, each submodule DC port and the double active bridging parallel operations of corresponding isolated form are sub
Unit is connected；
The double active bridging parallel operations (DAB) of the isolated form include that double active bridging parallel operation (DAB) of one or more isolated forms are single
Member, when active bridging parallel operation (DAB) subelements double using multiple isolated forms, the double active bridging parallel operations of each isolated form
(DAB) input terminal of subelement is connected with respective modules multilevel converter (MMC) DC terminal, described in output end parallel connection formation
Low-voltage direct bus.
3. a kind of solid-state transformer topology race applied to straight exchange mixing power distribution network according to claim 2, feature
Be: modularization level converter (MMC) the submodule topology is using two level topology or more level topology, wherein described
Two level topologys include that bridge-type topology and semi-bridge type topology, more level topologys are topological or double using the more level of monopole type
The more level topologys of polar form.
4. a kind of solid-state transformer topology race applied to straight exchange mixing power distribution network according to claim 3, feature
Be: the more level topologys of monopole type are by being converted to ambipolar more level topologys in exchange side series connection capacitance.
5. a kind of solid-state transformer topology race applied to straight exchange mixing power distribution network according to claim 2, feature
Be: double active bridging parallel operation (DAB) subelements of the isolated form are by input terminal converter, high-frequency isolation transformer, output end
Inverter composition, the high-frequency isolation transformer are connected between the input terminal converter, the output end inverter.
6. a kind of solid-state transformer topology race applied to straight exchange mixing power distribution network according to claim 5, feature
It is: double active bridging parallel operation (DAB) subelements of modularization multi-level converter (MMC) submodule and the isolated form
Input terminal converter topology is interconnected in DC side, and the two topology level number matches；Wherein: passing through the modularization level change of current
The capacitor of device (MMC) submodule realizes that the submodule of the modularization multi-level converter (MMC) and the isolated form are double active
The interconnection of bridging parallel operation (DAB).
7. a kind of solid-state transformer topology race applied to straight exchange mixing power distribution network according to claim 6, feature
Be: the input terminal converter topology is using two Level Full Bridges topology or more level topology, wherein more level topology packets
Include the more level topologys of capacitance type or ambipolar more level topologys.
8. a kind of solid-state transformer topology race applied to straight exchange mixing power distribution network according to claim 5, feature
Be: the high-frequency isolation transformer uses single-phase high frequency isolating transformer or three-phase high-frequency isolation transformer.
9. a kind of solid-state transformer topology race applied to straight exchange mixing power distribution network according to claim 5, feature
Be: the output end inverter parallel connection of double active bridging parallel operation (DAB) module topologies of the isolated form forms low-voltage direct
Bus, the output end inverter topology is using two Level Full Bridges topology or more level topology, wherein more level topology packets
Include the more level topologys of capacitance type or ambipolar more level topologys；The low-voltage direct bus according to port using very bipolar or
The pseudo- bipolar mode of connection.
10. a kind of described in any item solid-state transformer topology races for being applied to straight exchange mixing power distribution network of claim 1-9
Design method, it is characterised in that: include:
Submodule is divided into two level submodules according to the difference of modularization level converter (MMC) submodule level quantity by S1
With more level submodules；Wherein,
The two level submodule is divided into half-bridge module and full-bridge modules；
More level submodules are divided into the more level topologys of monopole type, ambipolar more level topologys and the more level of capacitance type
Topological three classes；
For modularization level converter (MMC) submodule, using two level topology or the more level topologys of monopole type；
For active bridging parallel operation (DAB) submodules double for the isolated form, input terminal and output end using bridge-type topology,
The more level topologys of capacitance type or ambipolar more level topologys；
Modularization level converter (MMC) submodule and described is determined according to the above classification and solid-state transformer design requirement
Double active bridging parallel operation (DAB) input/output terminals of isolated form are specifically topological, wherein modularization level converter (MMC)
Module and double active bridging parallel operation (DAB) the unit input terminals of isolated form are realized in DC side and are interconnected, to guarantee switching tube pressure resistance etc.
Grade is consistent, and the topological level number of the two needs to match, and the output end parallel connection of the double active bridging parallel operations (DAB) of the isolated form is formed
Low-voltage direct bus；
S2 becomes the high-frequency isolation according to double active bridging parallel operation (DAB) the medium-high frequency isolating transformer numbers of phases of the isolated form
Depressor point (DAB) is divided into single-phase high frequency isolating transformer and three-phase high-frequency isolation transformer, wherein the three-phase high-frequency isolation becomes
Three input terminals of company, depressor institute are separately connected A, B, C three-phase modular level converter (MMC) bridge arm submodule；
According to the above classification and solid-state transformer design requirement determine double active bridging parallel operation (DAB) medium-high frequencies of the isolated form every
From transformer type；
S3, according to determining modularization level converter (MMC) submodule topology, the double active bridging parallel operations of the isolated form
(DAB) input/output terminal topology and high-frequency isolation transformer type, combination obtain complete solid-state transformer topology, and according to solid
State design of transformer demand completes the design of associated electrical parameters, determines port connection mode, completes switching device type selecting；
To complete to be applied to the solid-state transformer topology race design of straight exchange mixing power distribution network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910599364.9A CN110492514A (en) | 2019-07-04 | 2019-07-04 | Solid-state transformer topology race and design method applied to alternating current-direct current mixing power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910599364.9A CN110492514A (en) | 2019-07-04 | 2019-07-04 | Solid-state transformer topology race and design method applied to alternating current-direct current mixing power distribution network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110492514A true CN110492514A (en) | 2019-11-22 |
Family
ID=68546747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910599364.9A Pending CN110492514A (en) | 2019-07-04 | 2019-07-04 | Solid-state transformer topology race and design method applied to alternating current-direct current mixing power distribution network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110492514A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110995030A (en) * | 2019-12-02 | 2020-04-10 | 上海交通大学 | Solid-state transformer with medium-voltage direct current and true-dual ultra-low-voltage direct current ports |
| CN111276992A (en) * | 2020-01-21 | 2020-06-12 | 全球能源互联网研究院有限公司 | Modular multi-level alternating current-direct current conversion system |
| CN111404410A (en) * | 2019-12-27 | 2020-07-10 | 华北电力大学（保定） | Multi-port AC-DC converter based on MMC and control method thereof |
| CN111917119A (en) * | 2020-07-06 | 2020-11-10 | 上海交通大学 | Solid-state transformer for restraining voltage fluctuation of multi-stage capacitor and control method and equipment |
| CN113054861A (en) * | 2021-03-08 | 2021-06-29 | 东南大学 | Series MMC converter topological structure with few modules |
| CN113300607A (en) * | 2021-05-26 | 2021-08-24 | 西安交通大学 | Double-active-bridge submodule based on full-bridge interface, direct-current transformer and control method of direct-current transformer |
| CN113364311A (en) * | 2021-06-25 | 2021-09-07 | 上海交通大学 | Multi-medium-voltage alternating-current port solid-state transformer and control method thereof |
| CN114825414A (en) * | 2022-04-14 | 2022-07-29 | 国网湖北省电力有限公司电力科学研究院 | High-voltage direct-current fault ride-through control method and system of energy router |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107017638A (en) * | 2017-05-23 | 2017-08-04 | 杭州电子科技大学 | A kind of many bus electric energy router topological structures of multiport suitable for power distribution network |
| US20180083550A1 (en) * | 2016-09-22 | 2018-03-22 | Lsis Co., Ltd. | Modular multi-level converter |
| CN109067218A (en) * | 2018-09-12 | 2018-12-21 | 上海交通大学 | A kind of solid-state transformer topological structure method based on more level submodules |
| CN109194137A (en) * | 2018-09-12 | 2019-01-11 | 上海交通大学 | A kind of modular solid-state transformer based on three level of half-bridge cascade connection type |
| CN109193801A (en) * | 2018-09-12 | 2019-01-11 | 上海交通大学 | Alternating current-direct current mixing power distribution network group network system and its control method |
-
2019
- 2019-07-04 CN CN201910599364.9A patent/CN110492514A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180083550A1 (en) * | 2016-09-22 | 2018-03-22 | Lsis Co., Ltd. | Modular multi-level converter |
| CN107017638A (en) * | 2017-05-23 | 2017-08-04 | 杭州电子科技大学 | A kind of many bus electric energy router topological structures of multiport suitable for power distribution network |
| CN109067218A (en) * | 2018-09-12 | 2018-12-21 | 上海交通大学 | A kind of solid-state transformer topological structure method based on more level submodules |
| CN109194137A (en) * | 2018-09-12 | 2019-01-11 | 上海交通大学 | A kind of modular solid-state transformer based on three level of half-bridge cascade connection type |
| CN109193801A (en) * | 2018-09-12 | 2019-01-11 | 上海交通大学 | Alternating current-direct current mixing power distribution network group network system and its control method |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110995030A (en) * | 2019-12-02 | 2020-04-10 | 上海交通大学 | Solid-state transformer with medium-voltage direct current and true-dual ultra-low-voltage direct current ports |
| CN111404410A (en) * | 2019-12-27 | 2020-07-10 | 华北电力大学（保定） | Multi-port AC-DC converter based on MMC and control method thereof |
| CN111276992A (en) * | 2020-01-21 | 2020-06-12 | 全球能源互联网研究院有限公司 | Modular multi-level alternating current-direct current conversion system |
| CN111917119A (en) * | 2020-07-06 | 2020-11-10 | 上海交通大学 | Solid-state transformer for restraining voltage fluctuation of multi-stage capacitor and control method and equipment |
| CN113054861A (en) * | 2021-03-08 | 2021-06-29 | 东南大学 | Series MMC converter topological structure with few modules |
| CN113300607A (en) * | 2021-05-26 | 2021-08-24 | 西安交通大学 | Double-active-bridge submodule based on full-bridge interface, direct-current transformer and control method of direct-current transformer |
| CN113364311A (en) * | 2021-06-25 | 2021-09-07 | 上海交通大学 | Multi-medium-voltage alternating-current port solid-state transformer and control method thereof |
| CN114825414A (en) * | 2022-04-14 | 2022-07-29 | 国网湖北省电力有限公司电力科学研究院 | High-voltage direct-current fault ride-through control method and system of energy router |
| CN114825414B (en) * | 2022-04-14 | 2023-12-19 | 国网湖北省电力有限公司电力科学研究院 | High-voltage direct-current fault ride-through control method and system for energy router |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110492514A (en) | Solid-state transformer topology race and design method applied to alternating current-direct current mixing power distribution network | |
| CN109067218A (en) | A kind of solid-state transformer topological structure method based on more level submodules | |
| CN108574420B (en) | Power electronic conversion unit and system | |
| CN107017638A (en) | A kind of many bus electric energy router topological structures of multiport suitable for power distribution network | |
| CN110504688A (en) | The solid-state transformer and control method for having alternating current-direct current fault ride-through service ability | |
| CN101707443B (en) | Novel electric power electric transformer | |
| CN105743352B (en) | A kind of the bidirectional, dc transformer and its control method of improved switching capacity access | |
| CN101572495B (en) | Multifunctional power electric transformer | |
| CN113364311B (en) | Multi-medium-voltage alternating-current port solid-state transformer and control method thereof | |
| CN104852583B (en) | A kind of more level DC transformers of High Frequency Link for mesolow DC distribution | |
| CN108832825A (en) | A kind of multiport electric power electric transformer topology of high power density | |
| CN107689739A (en) | A kind of restructural MMC submodule units and its control unit | |
| CN111416529B (en) | Modular multilevel solid-state transformer and submodule power balance control method thereof | |
| CN109193801A (en) | Alternating current-direct current mixing power distribution network group network system and its control method | |
| CN110311381A (en) | A kind of alternating current-direct current mixing grid power electronic transformer passing through DC Line Fault | |
| CN109194137A (en) | A kind of modular solid-state transformer based on three level of half-bridge cascade connection type | |
| CN109361214A (en) | A kind of active electric energy router having alternating current-direct current fault traversing | |
| CN107786099A (en) | A kind of highly reliable commutator transformer system of segmentation more and its control method | |
| CN109980948A (en) | A kind of five port electric power electric transformer of three Coupling Between Phases | |
| CN108306324A (en) | Modularization centralized formula energy-storage system | |
| CN109347357A (en) | A kind of four port electric power electric transformers | |
| CN107800299A (en) | Modularized dc transformation system and its control method based on MMC high frequency conversions | |
| CN112653149A (en) | High-power electric energy router suitable for low-voltage distribution network | |
| CN109510492A (en) | A kind of dual output MMC topology based on bridge arm bifurcation structure | |
| CN106505902B (en) | LCC/VSC direct current interconnects transformer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191122 |