CN110492748A - A kind of reciprocating isolated form DC/DC converter topology of output based on DAB - Google Patents
A kind of reciprocating isolated form DC/DC converter topology of output based on DAB Download PDFInfo
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- CN110492748A CN110492748A CN201910547679.9A CN201910547679A CN110492748A CN 110492748 A CN110492748 A CN 110492748A CN 201910547679 A CN201910547679 A CN 201910547679A CN 110492748 A CN110492748 A CN 110492748A
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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
-
- 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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—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 with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
-
- 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
- H02M1/0083—Converters characterised by their input or output configuration
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Direct Current Feeding And Distribution (AREA)
Abstract
The present invention provides a kind of reciprocating isolated form DC/DC converter of the output based on DAB (Output Reciprocating Isolated DC/DC Converter Based on Dual Active Bridge) topology.The topology is by typical 4 DAB(Dual Active Bridge) based on structure, using IOSP(Input Series Output Parallel) Topology connection mode.It is furnished with a switching valve between DAB3 and DAB4.The switching valve is made of 3 switch blocks, i.e. SA1 ~ SA3.Each switch block is made of the IGBT of two differential concatenations, and one freewheeling diode of each IGBT reverse parallel connection.Low-voltage direct side is with there are two dc circuit breaker CB1 and CB2.The topology can work in single output voltage mode and multiple voltage output mode, by switching valve come the switching of control model.When in single output voltage mode, 4 DAB output-parallel outputs, output voltage is determined by the control strategy and high frequency transformer of DAB；When in multiple voltage output mode, 2 DAB output-parallels, 2 DAB output series connection, double-bus partition running exports two different voltages voltage gradations.
Description
Technical field
The invention belongs to high-voltage dc transmission electrical domains, and in particular to a kind of reciprocating isolated form DC/DC of output based on DAB
Converter (Output Reciprocating Isolated DC/DC Converter Based on Dual Active
Bridge)。
Background technique
On the one hand, traditional transformer does not have harmonic management energy there is the identification and self-handling that can not carry out failure
The problems such as power.On the other hand, extensive new energy, which is connected to the grid, to cause to impact to existing electric network composition.Since new energy exists
The features such as intermittent, unstable, traditional electric network composition are difficult to dissolve.Under the dual-pressure of self-defect and Energy situation,
There is an urgent need to be transformed to existing structure for power transformer.Exactly in this context, electric power electric transformer is proposed
The imagination of (power electronic transformer, PET).In recent years, electric power electric transformer has obtained grinding both at home and abroad
Study carefully the great attention of scholar, the relevant technologies are rapidly developed.
The large-scale grid connection of new energy changes the power transmission mode of conventional flex direct current transportation.Conventional flex direct current transportation master
Electric energy is transmitted using point-to-point type structure, the following flexible DC transmission transmission mode will gradually develop to distributed frame,
This requires electric power electric transformers to need the interface of more different voltages grades, different voltages form.At this stage, electric power
The scheme that electronic transformer expands low-voltage dc voltage grade is roughly divided into two classes: (1) on the basis of traditional PET is topological, increasing
Add isolated form DC/DC transform part (2) that original double active bridge topologys are changed to more active bridge (Multiple Active
Bridge, MAB) topology.
Scheme one is most direct mode.But increase the mode of DC/DC transform part by force in PET topology, it can lead
It causes the number of isolating transformer and power electronic devices to greatly increase, increases the cost of PET.Increase additional DC/DC ring simultaneously
Festival-gathering increases energy loss, reduces efficiency of transmission.Scheme two reduces transformation of electrical energy link but there are module degree is not high, no
The shortcomings that easily expanding, and when the number of windings increases, each port degree of coupling is deepened, and control logic can become very complicated.
Summary of the invention
In view of the above-mentioned problems, the present invention designs a kind of reciprocating isolated form DC/DC converter topology of the output based on DAB.
When in single output voltage mode, 4 DAB output-parallel outputs；When in multiple voltage output mode, 2 DAB outputs are simultaneously
Join 2 DAB output series connection, double-bus partition running exports two different voltages voltage gradations.The topology can utmostly land productivity
The purpose for expanding low-voltage dc voltage grade is realized with existing device, and the degree of modularity is high.
The reciprocating isolated form DC/DC converter topology of a kind of output based on DAB proposed by the present invention is based on pattern switching
Principle, devise relevant workflow and control logic.
Detailed description of the invention
Fig. 1 is the 4DAB typical structure for proposing topology.Wherein SA1~SA3 is switch block, and CB1 and CB2 are direct current interruption
Device.
Fig. 2 is DAB topological structure.Wherein C1And C2The respectively electric capacity of voltage regulation of high voltage direct current side and low-voltage direct side.
Fig. 3 is the operation principle schematic diagram of switch block.When being in forward power stream, S2 shutdown, switching group is connected in S1
Part is in investment state, and current direction is from left to right；Two IGBT are turned off, and switch block is in excision state, switching group
Part no current flows through.When being in backward power stream, switch block working principle is similar.
Fig. 4 is a kind of MMC type PET construction.Wherein high-pressure side uses MMC structure, and isolation level uses DAB structure, inverse cascade
Using phase three-wire three formula structure.The isolation level of the PET can expand low-voltage dc voltage grade using proposed topology.
Fig. 5 is a kind of Cascade H bridge type PET construction.Wherein high-pressure side uses cascaded H-bridges structure, and isolation level is tied using DAB
Structure, inverse cascade use phase three-wire three formula structure.The isolation level of the PET can expand low-voltage dc voltage etc. using mentioned topology
Grade.
Fig. 6 is mentions Scenario Design of topology under the conditions of new-energy grid-connected.Wherein CHB refers to cascaded H-bridges structure,
MPPT is grid-connected used maximum power tracing control, and Virtualization Mode switch represents operation mould locating for mentioned topology
Formula.When Virtualization Mode closes the switch, topology is as proposed in multiple voltage output mode；It is disconnected when Virtualization Mode switchs, i.e.,
To be proposed topology in single voltage output mode.
Specific embodiment
Isolated form DC/DC converter topology is mentioned by the present invention as shown in Figure 1, wherein the topological structure of DAB such as Fig. 2 institute
Show.Switch block SA in switching valve can be any switch block that branch investment excision may be implemented.All satisfactions are mentioned
The use of the switch block that topology requires in the present invention is within that scope of the present invention.Switch block uses in the present invention
Double IGBT differential concatenations, the structure of each one freewheeling diode of IGBT reverse parallel connection guarantee to remain to reliably throw when power is reversed
Enter handoff leg.
The working principle of switch block, as shown in Figure 3.When being in forward power stream, S2 shutdown, switch block is connected in S1
In investment state, current direction is from left to right；Two IGBT are turned off, and switch block is in excision state, switch block
No current flows through.When being in backward power stream, S1 turns off S2 conducting, and switch block be in investment state, current direction for from
The right side a to left side；Two IGBT are turned off, and switch block is in excision state, and switch block no current flows through.For simplicity, hereafter
Certain switch block state in which is referred to " SAi investment/excision ", the number that wherein i is 1~3.For example, " SA1 investment " i.e. table
Show that, regardless of power flow direction, electric current can flow to the other end from one end.
For the performance and working principle that the present invention is further explained, topological mode switching is introduced below with reference to attached drawing
Workflow.
There are two types of operational modes for the topology: first is that single voltage class output mode, second is that multiple voltage class exports mould
Formula.As shown in Figure 1, it is assumed that the voltage class of HVDC is 800kV, 4 DAB high voltage direct current sides bear voltage is equal and low pressure
DC side output voltage is 200kV.DAB low-voltage direct side exports the result that 200kV is constant voltage control.It should be noted that
The voltage assumed is intended merely to that problem is better described, and there is no actual engineering significances.
When operational mode one, CB1 and CB2 are closed, and L1 is connected with L3, and L2 is connected with L4.SA1 and SA3 investment,
SA2 excision.It is equivalent in 4 end DAB parallel outputs to bus L1 and L2, is only existed on low-voltage direct bus at this time at this time
Mono- DC voltage of 200kV.
When operational mode two, CB1 and CB2 are disconnected, and L1, L2 and L3, L4 become two discrete DC voltages
Bus.SA1 and SA3 excision, SA2 investment.At this time on DAB1 and DAB2 parallel output bus L1 and L2, the electricity on L1 and L2 at this time
Pressure is 200kV.DAB3 and DAB4 output series connection is connected on bus L3 and L4, and the voltage on L3 and L4 is 400kV at this time.
When slave pattern one changes to mode two, by controlling trigger pulse, SA1 and SA3 are become cutting from investment state
Except state, SA2 becomes investment state from excision state, and CB1 and CB2 are each turned off, can implementation pattern handoff procedure.
It is illustrated by above-mentioned it is found that a kind of output based on DAB proposed is reciprocating in conjunction with control method appropriate
Isolated form DC/DC converter topology is able to achieve the multi-voltage grade output and the output of single voltage class of low-voltage direct side, and energy
Mutually switching between the two states.
Topology is proposed to have broad application prospects in flexible DC transmission.Fig. 4 is the canonical topology of MMC type PET；Figure
5 be the canonical topology of Cascade H bridge type PET.Proposing topology can apply in both the above PET topology.Fig. 6 is with MMC type PET
Core constructs the application scenarios mentioned Tuo Pu under extensive new-energy grid-connected background.As seen from the figure, mentioned topology passes through mould
Formula switches the switching operation that can advantageously realize new energy branch.For example, photovoltaic is in night output power deficiency, mentioned topology
By operating in single output voltage mode, photovoltaic can be made to be detached from operation of power networks, be equipped with corresponding energy storage device at this time.Subtracting
While the voltage fluctuation of small photovoltaic is to electric network influencing, moreover it is possible to correspondingly increase efficiency of energy utilization.
Finally it should be noted that: described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, shall fall in the protection scope of this application.
Claims (4)
1. a kind of reciprocating isolated form DC/DC converter topology of output based on DAB, it is characterised in that: be with 4 DAB structures
Basis.A switching valve is configured two DAB output junctions.In addition to this, low-voltage direct bus bar configuration has bus section disconnected
Road device, allocation position is as shown in Figure of abstract.It should be noted that Figure of abstract, with 4 DAB structural representations, practical this is opened up
DAB scene of the number more than 4 can also be applied to by flutterring.
2. a kind of reciprocating isolated form DC/DC converter topology of output based on DAB according to right 1, it is characterised in that:
It include 3 switch blocks in switching valve, 3 switch blocks can be any switch block that branch investment excision may be implemented.
Switch block is guaranteed using double IGBT differential concatenations, the structure of each one freewheeling diode of IGBT reverse parallel connection in the present invention
It remains to reliably put into handoff leg when power is reversed.
3. a kind of reciprocating isolated form DC/DC converter topology of output based on DAB according to right 1, it is characterised in that:
The topology can work in single output voltage mode and multiple voltage output mode, and can be between both of which mutually
Switching.When working in single output voltage mode, SA1 and SA3 are in investment state, and SA2 is in excision state, 4 DAB parallel connections
Export single voltage class.When working in multiple output voltage grade, SA1 and SA3 are in excision state, and SA2 is in investment shape
State, 2 DAB output-parallels, 2 DAB output series connection, double-bus partition running export two voltage class.
4. a kind of reciprocating isolated form DC/DC converter topology of output based on DAB according to right 1, it is characterised in that:
It is low to act not only as electric power electric transformer expansion for a kind of reciprocating isolated form DC/DC converter topology of output based on DAB
The means of straightening stream output level can also be made up of similar ISOP structure principle of compositionality and be applied to other related fieldss,
It connects using the other application occasion of invention topology and thought in interest field.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111345889A (en) * | 2020-03-30 | 2020-06-30 | 四川锦江电子科技有限公司 | Pulse generation circuit applied to pulsed electric field ablation technology and control method |
| CN111509830A (en) * | 2020-04-29 | 2020-08-07 | 南京理工大学 | Topological structure of miniature photovoltaic/energy storage intelligent power station |
| CN113708613A (en) * | 2021-07-22 | 2021-11-26 | 国网江苏省电力有限公司南京供电分公司 | Movable AC/DC multi-port flexible controller and ring closing and opening starting and stopping method |
| CN115995965A (en) * | 2023-03-22 | 2023-04-21 | 浙江大学杭州国际科创中心 | Modularized wide-input wide-output voltage range DC-DC converter |
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Application publication date: 20191122 |