CN109532536A - A kind of traction drive topological structure - Google Patents
A kind of traction drive topological structure Download PDFInfo
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- CN109532536A CN109532536A CN201811407036.6A CN201811407036A CN109532536A CN 109532536 A CN109532536 A CN 109532536A CN 201811407036 A CN201811407036 A CN 201811407036A CN 109532536 A CN109532536 A CN 109532536A
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- traction drive
- topological structure
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- traction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2200/00—Type of vehicles
- B60L2200/26—Rail vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2210/00—Converter types
- B60L2210/10—DC to DC converters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2210/00—Converter types
- B60L2210/30—AC to DC converters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2210/00—Converter types
- B60L2210/40—DC to AC converters
- B60L2210/42—Voltage source inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
Abstract
The embodiment of the present invention provides a kind of traction drive topological structure, in order to reduce the use that DC/DC converter unit input side presses passive element, the outlet side of each AC/DC converter unit is connect with DC/DC converter unit input side, the Balance route of DC/DC input voltage has been converted in this way to export the control pressed to AC/DC converter unit, without adding additional equalizer circuit, the reliability that circuit structure improves power electronics tractive transformer is enormously simplified；AC/DC converter unit uses identical control amount, can be realized the reliability that traction drive is improved to oneself of Arbitrary Fault AC/DC converter unit in traction drive power electronics tractive transformer or DC/DC converter unit excision and failure from processing capacity；The Balance route of DC/DC converter unit input voltage can be realized on the basis of without using pressure passive device.
Description
Technical field
The present embodiments relate to the Traction Drive technical fields of EMU, more particularly, to a kind of Traction Drive system
System topological structure.
Background technique
Currently, mainly passing through traditional transformer for alternating current in the traction drives such as electric locomotive, EMU
The voltage class that pressure drop is suitble to traction electric machine and the work of other vehicle mounted electrical apparatus.Traditional transformer is mainly by coil windings
It is formed with iron core, volume and weight is all very big.However, the size of volume of transformer and weight has very big shadow to the design of locomotive
It rings, especially in the high-speed EMUs of power decentralized, since the braking power of desired traction power and feedback is big, needs
It is capable of providing powerful transformer, the power of transformer, which increases weight and volume, will also increase with it, but heavy weight
Transformer will directly affect the speed-raising of train；Simultaneously because the pulling equipment of disperse power is no longer installed concentratedly on locomotive, and
It is that dispersion is mounted in the compartment of train, bulky transformer will increase the design difficulty of train, reduce passenger capacity.
With the development of power electronic technique and material technology, there is one power electronics tractive transformer of novel transformer
(Power Electronic Traction Transformer, PETT), the transformer are become by high frequency transformer and power electronics
Two core devices of parallel operation are constituted, and the industrial frequency AC electric energy of input is converted to high-frequency ac electric energy and provided by converters
High frequency transformer once inputs, and the secondary output electric energy of high frequency transformer is connect with converters, and the high frequency of output is handed over
Galvanic electricity can be converted to industrial frequency AC electric energy, for electrical load.Electric power electric transformer is realizing traditional transformer voltage transformation function
While energy, the functions such as electricity frequency conversion, covert are completed.Electric power electric transformer have a characteristic that (1) it is small in size, it is light-weight,
Non-environmental-pollution；(2) power quality can be adjusted, control system trend；(3) has the function of breaker；(4) contain intelligence
It can control unit, be easy to implement the digitlization and intelligence of power grid.Currently, power electronics tractive transformer foreign countries have it is a small amount of
Research application, studies in China is still in its infancy.
Applied in the novel traction transmission system of shipping EMU, AC-DC converter unit is become using power electronics traction
Depressor.Power electronics tractive transformer is the interconnection converting means of a kind of medium/high pressure AC network and low-voltage direct power grid, application
In shipping EMU traction transmission system, it is intended to substitute the industrial frequency traction transformer in existing shipping EMU traction transmission system
And four-quadrant rectifier.Application publication number is that the Chinese invention patent of CN 107769239A discloses a kind of novel alternating current
Power electronic transformer topological structure, power electronics tractive transformer are made of several modules, and each module is converted single by AC/DC
Member and DC/DC converter unit two parts composition.Its AC/DC converter unit is based on High-tension Switch Devices, using H-bridge circuit structure；
DC/DC converter unit is based on low tension switch device, and inputs the concatenated circuit of series connection-output using multiple DC/DC converter units
Structure；The volume, weight and cost of device can be greatly reduced in this circuit structure, improve the degree of modularity of device and then improve
The reliability of device entirety and property easy to repair.However, there are the following problems for this circuit structure: 1, DC/DC transformation is single
Member is connected in series by the input series connection-output of multiple DC/DC converter units, and when any DC/DC converter unit failure, power electronics is led
The AC-DC conversion module for drawing transformer can not work normally, and cause the reliability of power electronics tractive transformer module not high；2,
DC/DC converter unit input side and outlet side need to carry out pressure and handle, and a large amount of passive element are used, such as capacitor and electricity
Sense, increases the volume of device.
Summary of the invention
The embodiment of the present invention provides a kind of a kind of traction for overcoming the above problem or at least being partially solved the above problem
Transmission system topological structure.
In a first aspect, the embodiment of the present invention provides a kind of traction drive topological structure, including power electronics traction becomes
Depressor, three-phase voltage-type inverter and traction electric machine；
The power electronics tractive transformer is used to the alternating current of contact net being converted to direct current；
The three-phase voltage-type inverter is used for the alternating current by the DC inverter for changeable frequency, and is transferred to institute
State traction electric machine；
The traction electric machine is used for the alternating current based on the changeable frequency for receiving the three-phase voltage-type inverter input, and
Be converted to traction drive power；
The power electronics tractive transformer includes multiple AC/DC converter units, multiple AC/DC converter units it is defeated
Enter side series connection；The outlet side of each AC/DC converter unit is connected to the input side of a DC/DC converter unit, Suo Yousuo
The outlet side for stating DC/DC converter unit is parallel with one another.
Preferably, the input side of each DC/DC converter unit includes the first direct-flow input end and the second direct current
Input terminal, first direct-flow input end and second direct-flow input end input decoupling capacitor in parallel, the first direct current are defeated
Enter the DC output side that end connects the AC/DC converter unit with the second direct-flow input end.
Preferably, the outlet side of each DC/DC converter unit includes the first DC output end and the second direct current
Output end, first DC output end and second DC output end are parallel with an output filter capacitor, all described
The first DC output end and the second DC output end of DC/DC converter unit are parallel with one another.
Preferably, the outlet side H bridge of the DC/DC converter unit connects intermediate-frequency transformer, institute by resonant branch
Stating resonant branch includes resonant inductance and resonant capacitance, and the resonant inductance and the resonant capacitance are connected.
Preferably, the three-phase voltage-type inverter include three bridge arms, the three-phase voltage-type inverter it is straight
Stream input side connects the DC output side of the power electronics tractive transformer；The exchange of the three-phase voltage-type inverter exports
Side is drawn by the midpoint of three bridge arms, and connects the traction electric machine.
Preferably, the input side of each DC/DC converter unit is mutually isolated, each AC/DC transformation is single
The input side of member is connected with by-pass switch, and the by-pass switch is used in corresponding AC/DC converter unit or DC/DC converter unit
When failure, the AC/DC converter unit or DC/DC converter unit are switched out into the power electronics tractive transformer.
Preferably, the three-phase voltage-type inverter includes several, and every three-phase voltage-type inverter
Control mode it is identical；By three-phase voltage-type inverter described in Frequency conversion control, keep the three-phase voltage-type inverter defeated
Sinusoidal current out.
Preferably, the traction electric machine is permanent-magnet synchronizing traction motor.
Preferably, the DC/DC converter unit is two-way isolated DC/DC converter unit.
Preferably, the AC/DC converter unit is H bridge topological structure, all AC/DC converter units share one
A boost inductance.
The embodiment of the present invention proposes a kind of traction drive topological structure, in order to reduce the input of DC/DC converter unit
The use of passive element is pressed in side, and the outlet side of each AC/DC converter unit is connect with DC/DC converter unit input side, this
Sample has been converted to the Balance route of DC/DC input voltage to export the control pressed to AC/DC converter unit, without
Additional equalizer circuit is added, the reliability that circuit structure improves power electronics tractive transformer is enormously simplified；AC/DC becomes
Unit is changed using identical control amount, can be realized to Arbitrary Fault AC/ in traction drive power electronics tractive transformer
DC converter unit or DC/DC converter unit from cutting off, the reliability and failure for improving traction drive are from processing capacity；
The Balance route that DC/DC converter unit input voltage can be realized on the basis of without using pressure passive device, thus significantly
Reduce the volume of the complete machine of traction drive, reduces manufacturing cost, be conducive to the raising of complete machine power density.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the traction drive topological structure block diagram according to the embodiment of the present invention；
Fig. 2 is the traction drive topological structure schematic diagram according to the embodiment of the present invention；
Fig. 3 is the power electronics tractive transformer topological structure schematic diagram according to the embodiment of the present invention；
Fig. 4 is the three-phase voltage-type inverter band permanent magnet synchronous motor topological structure schematic diagram according to the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Since in the power electronics tractive transformer of prior art traction drive, DC/DC converter unit is by multiple DC/
Input series connection-the output of DC converter unit is connected in series, when any DC/DC converter unit failure, power electronics tractive transformer
AC-DC conversion module can not work normally, and cause the reliability of power electronics tractive transformer module not high；DC/DC transformation is single
First input side and outlet side need to carry out pressure and handle, and use a large amount of passive element: capacitor and inductance increase device
Volume.
Therefore various embodiments of the present invention needle is by the outlet side of each AC/DC converter unit and DC/DC converter unit input side
Connection has been converted to the Balance route of DC/DC input voltage to export the control pressed to AC/DC converter unit in this way,
Without adding additional equalizer circuit, enormously simplifies circuit structure and improve the reliable of power electronics tractive transformer
Property；AC/DC converter unit uses identical control amount, can be realized and appoints in traction drive power electronics tractive transformer
The excision certainly of meaning failure AC/DC converter unit or DC/DC converter unit, the reliability and failure for improving traction drive are certainly
Processing capacity.Expansion explanation and introduction will be carried out by multiple embodiments below.
Fig. 1 is a kind of traction drive topological structure provided in an embodiment of the present invention, including power electronics traction voltage transformation
Device, three-phase voltage-type inverter and traction electric machine；
The power electronics tractive transformer is used to the alternating current of contact net being converted to direct current；
The three-phase voltage-type inverter is used for the alternating current by the DC inverter for changeable frequency, and is transferred to institute
State traction electric machine；
The traction electric machine is used for the alternating current based on the changeable frequency for receiving the three-phase voltage-type inverter input, and
Be converted to traction drive power；
The power electronics tractive transformer includes multiple AC/DC converter units, multiple AC/DC converter units it is defeated
Enter side series connection；The outlet side of each AC/DC converter unit is connected to the input side of a DC/DC converter unit, Suo Yousuo
The outlet side for stating DC/DC converter unit is parallel with one another.
In the present embodiment, above-mentioned traction drive is applied to the Traction Drive of shipping EMU, it is intended to improve traction
The efficiency and power density of transmission system.
In the present embodiment, the AC/DC converter unit of above-mentioned power electronics tractive transformer and DC/DC converter unit are adopted
Use High-tension Switch Devices.
In the present embodiment, traction drive mainly includes three major parts: power electronics tractive transformer, three-phase
Voltage source inverter and traction electric machine.Wherein the alternating current of contact net is converted into direct current by power electronics tractive transformer；It is inverse
The DC inverter that change device exports power electronics tractive transformer is at the alternating current of changeable frequency to driving motor；Traction electricity
Machine generally selects permanent magnet synchronous motor, provides the traction drive power of shipping EMU.
On the basis of the above embodiments, as a preferred embodiment, as shown in Fig. 2, traction drive packet
Include a power electronics tractive transformer, four three-phase voltage-type inverters and four permanent magnet synchronous motors.Power electronics traction
The ac input end A of transformer is connect by vacuum circuit breaker 3 and pantograph 2 with contact net 1；Power electronics tractive transformer is handed over
Stream input terminal B is connect with wheel 4, and wheel 4 is contacted with rail 5.DC output end C, D of power electronics tractive transformer connect respectively
Meet four three-phase voltage-type inverter INV1、INV2、INV3、INV4；The ac output end of above-mentioned 4 three-phase voltage-type inverters
xj、yj、zjIt is separately connected 1 permanent magnet synchronous motors PMj(j=1,2,3,4).
On the basis of the above embodiments, as a preferred embodiment, above-mentioned DC/DC converter unit be it is two-way every
LLC mode of resonance DC/DC converter or double active bridge DC/ can be selected using full-bridge or half-bridge structure from formula DC/DC converter unit
DC converter.
On the basis of the above embodiments, as a preferred embodiment, above-mentioned AC/DC converter unit is that H bridge is opened up
Structure is flutterred, all AC/DC converter units share a boost inductance.
On the basis of the above embodiments, as a preferred embodiment, as shown in figure 3, being become using 12 AC/DC
It changes unit and 12 DC/DC converter units collectively forms power electronics tractive transformer；The input side of each AC/DC converter unit
It is serially connected, outlet side is connected with DC/DC converter unit；The input side of each DC/DC converter unit is mutually isolated, outlet side phase
It is mutually in parallel, collectively constitute 12 grades of conversion circuit；Every level-one includes an AC/DC converter unit and a DC/DC converter unit；
If the AC/DC converter unit or DC/DC converter unit of certain level-one break down, this grade of AC/DC converter unit input terminal
By-pass switch movement, this grade of AC/DC converter unit and DC/DC converter unit bypasss from device and come, maintains electric power electric
The normal operation of sub- tractive transformer, the reliability and failure for substantially increasing traction drive are from processing capacity.
Specifically, during the connection process, as shown in figure 3, the ac input end A of power electronics tractive transformer passes through preliminary filling
Electric installation 6 and single-phase filter inductance 7 connect the input terminal a of the 1st grade of AC/DC converter unit1, ac input end B connects the 12nd grade
The input terminal b of AC/DC converter unit12；The ac input end a of remaining AC/DC converter uniti、biIt is serially connected, and every grade
A by-pass switch, the output end and rear class of i-stage AC/DC converter unit are all connected between the input terminal of AC/DC converter unit
The input terminal of i-stage DC/DC converter unit is connected with each other, tie point ci、di, the DC output end of each DC/DC converter unit
ei、fiIt is parallel with one another；Above-mentioned AC/DC converter unit uses full bridge structure, and DC/DC converter unit uses full-bridge LLC structure.
On the basis of the above embodiments, as a preferred embodiment, each AC/DC converter unit input side
Ac input end ai、bi(i=1,2 ..., 12) is serially connected, the output end and rear class i-stage DC/ of i-stage AC/DC converter unit
The input terminal of DC converter unit is connected with each other, tie point ci、di, the DC output end e of each DC/DC converter uniti、fiPhase
It is mutually in parallel.
On the basis of the above embodiments, as a preferred embodiment, the AC/DC converter unit uses H bridge
Topological structure shares a boost inductance.
The DC/DC converter unit uses full-bridge resonant LLC technology structure, and input and output side is active H bridge structure.
In the present embodiment, the Sofe Switch of DC/DC converter unit may be implemented in traction drive circuit topological structure, mentions
The transformation of electrical energy efficiency of high novel traction drive complete machine；DC/DC converter unit input side can be reduced and press passive device
Use, reduce the volume of complete machine, manufacturing cost reduced, to be conducive to the raising of complete machine power density.
On the basis of the above embodiments, as a preferred embodiment, in order to reduce the input of DC/DC converter unit
The use of passive element is pressed in side, and the outlet side of each AC/DC converter unit is connect with DC/DC converter unit input side, this
Sample has been converted to the Balance route of DC/DC converter unit input voltage to export the control pressed to AC/DC converter unit,
Without adding additional equalizer circuit, enormously simplifies circuit structure and improve the reliable of power electronics tractive transformer
Property.
On the basis of the above embodiments, as a preferred embodiment, 12 AC/DC converter units are using identical
Control amount so that the DC output side c of each AC/DC converter uniti、diBetween approximately equal (the i.e. V of current potentialcd1=Vcd2=
Vcd3=...=Vcd12), and then 12 DC/DC converter units is made equally to input in parallel, output-parallel；By control, so that
The DC input voitage balance and output current balance type of 12 DC/DC converter units, it is ensured that DC/DC converter unit is in different operating conditions
Under power-balance.
On the basis of the above embodiments, as a preferred embodiment, each DC/DC converter unit it is defeated
Enter side and includes the first direct-flow input end and the second direct-flow input end, first direct-flow input end and second direct-flow input end
An input decoupling capacitor in parallel, the first direct-flow input end and the second direct-flow input end connect the straight of the AC/DC converter unit
Flow outlet side.
In the present embodiment, as shown in figure 3, the first direct-flow input end of each DC/DC converter unit, the input of the second direct current
Hold one input decoupling capacitor C of parallel connectionini, and connect with the DC output side of i-stage AC/DC converter unit；I-stage AC/DC becomes
The input side of the outlet side and rear class i-stage DC/DC converter unit that change unit is connected with each other, tie point ci、di。
On the basis of the various embodiments described above, the outlet side of each DC/DC converter unit includes the first direct current output
End and the second DC output end, first DC output end and second DC output end are parallel with an output filtered electrical
Hold, the first DC output end and the second DC output end of all DC/DC converter units are parallel with one another.
In the present embodiment, the first DC output end of each DC/DC converter unit and the second DC output end are distinguished simultaneously
Join an output filter capacitor CoiThen parallel with one another.
On the basis of the various embodiments described above, the outlet side H bridge of the DC/DC converter unit passes through in resonant branch connection
Frequency power transformer, the resonant branch include resonant inductance and resonant capacitance, and the resonant inductance and the resonant capacitance are connected.
In the present embodiment, it is connected between DC/DC converter unit input side H bridge and intermediate-frequency transformer with resonant branch, it is humorous
Branch of shaking routes resonant inductance LriWith resonant capacitance CriIt is composed in series.
On the basis of the various embodiments described above, the three-phase voltage-type inverter includes three bridge arms, the three-phase voltage
The direct current input side of type inverter connects the DC output side of the power electronics tractive transformer；The three-phase voltage type inversion
The exchange outlet side of device is drawn by the midpoint of three bridge arms, and connects the traction electric machine.
In the present embodiment, three-phase voltage-type inverter includes: 3 bridge arms, and direct current input side connection power electronics is led
Draw the direct current output of transformer；It exchanges output and is drawn by the midpoint of three bridge arms, traction electric machine is connected, as shown in figure 4, three
Phase inverter is made of three bridge arms, draws the midpoint x of three bridge arms respectivelyj、yj、zjConnect permanent magnet synchronous motor.
On the basis of the various embodiments described above, above-mentioned traction electric machine is permanent-magnet synchronizing traction motor.
On the basis of the various embodiments described above, the input side of each DC/DC converter unit is mutually isolated, each described
The input side of AC/DC converter unit is connected with by-pass switch, the by-pass switch be used in corresponding AC/DC converter unit or
When DC/DC converter unit failure, the AC/DC converter unit or DC/DC converter unit are switched out into the power electronics and drawn
Transformer.
In the present embodiment, if the AC/DC converter unit or DC/DC converter unit of certain level-one break down, this
The by-pass switch movement of grade AC/DC converter unit input terminal, by this grade of AC/DC converter unit and DC/DC converter unit from device
Middle bypass is come, maintain power electronics tractive transformer normal operation, substantially increase traction drive reliability and
Failure is from processing capacity.
Specifically, as a preferred embodiment, in non-faulting operating condition, the AC/DC converter unit and
DC/DC converter unit is in normal operating condition, maintains each AC/DC converter unit to export lateral capacitance C by Pressure and Controlin1,
Cin2,……,Cin12The balance of voltage and sharing control maintain each DC/DC converter unit to export electric current Io1,Io2,……,Io12
Current balance type；
When any level-one AC/DC converter unit or DC/DC converter unit break down or will break down, make this grade
The by-pass switch of AC/DC converter unit input terminal acts, then blocks AC/DC converter unit and the DC/DC transformation of the grade that breaks down
The driving pulse of unit, thus realize to the AC/DC converter unit for the grade that breaks down or cutting out automatically for DC/DC converter unit,
The AC/DC converter unit and DC/DC converter unit for the grade that breaks down at this time not output power.
On the basis of the various embodiments described above, the three-phase voltage-type inverter includes several, and every three-phase
The control mode of voltage source inverter is identical；By three-phase voltage-type inverter described in Frequency conversion control, make the three-phase electricity
Die mould inverter exports sinusoidal current.
In conclusion a kind of traction drive topological structure provided in an embodiment of the present invention, in order to reduce DC/DC transformation
Unit input side presses the use of passive element, by the outlet side of each AC/DC converter unit and DC/DC converter unit input side
Connection has been converted to the Balance route of DC/DC input voltage to export the control pressed to AC/DC converter unit in this way,
Without adding additional equalizer circuit, enormously simplifies circuit structure and improve the reliable of power electronics tractive transformer
Property；AC/DC converter unit uses identical control amount, can be realized and appoints in traction drive power electronics tractive transformer
The excision certainly of meaning failure AC/DC converter unit or DC/DC converter unit, the reliability and failure for improving traction drive are certainly
Processing capacity；The Balance route of DC/DC converter unit input voltage can be realized on the basis of without using pressure passive device,
To greatly reduce the volume of the complete machine of traction drive, manufacturing cost is reduced, the raising of complete machine power density is conducive to.
The apparatus embodiments described above are merely exemplary, wherein described, unit can as illustrated by the separation member
It is physically separated with being or may not be, component shown as a unit may or may not be physics list
Member, it can it is in one place, or may be distributed over multiple network units.It can be selected according to the actual needs
In some or all of the modules achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness
Labour in the case where, it can understand and implement.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (10)
1. a kind of traction drive topological structure, which is characterized in that inverse including power electronics tractive transformer, three-phase voltage type
Become device and traction electric machine；
The power electronics tractive transformer is used to the alternating current of contact net being converted to direct current；
The three-phase voltage-type inverter is used for the alternating current by the DC inverter for changeable frequency, and is transferred to described lead
Draw motor；
The traction electric machine is used for the alternating current based on the changeable frequency for receiving the three-phase voltage-type inverter input, and converts
For traction drive power；
The power electronics tractive transformer includes multiple AC/DC converter units, the input side of multiple AC/DC converter units
Series connection；The outlet side of each AC/DC converter unit is connected to the input side of a DC/DC converter unit, all DC/
The outlet side of DC converter unit is parallel with one another.
2. traction drive topological structure according to claim 1, which is characterized in that each DC/DC transformation is single
The input side of member includes the first direct-flow input end and the second direct-flow input end, first direct-flow input end and second direct current
It is single that input terminal one input decoupling capacitor of parallel connection, the first direct-flow input end and the second direct-flow input end connect the AC/DC transformation
The DC output side of member.
3. traction drive topological structure according to claim 1, which is characterized in that each DC/DC transformation is single
The outlet side of member includes the first DC output end and the second DC output end, first DC output end and second direct current
Output end is parallel with an output filter capacitor, the first DC output end and the second direct current of all DC/DC converter units
Output end is parallel with one another.
4. traction drive topological structure according to claim 1, which is characterized in that the DC/DC converter unit
Outlet side H bridge connects intermediate-frequency transformer by resonant branch, and the resonant branch includes resonant inductance and resonant capacitance, described humorous
Vibration inductance and resonant capacitance series connection.
5. traction drive topological structure according to claim 1, which is characterized in that the three-phase voltage-type inverter
Including three bridge arms, the direct current input side of the three-phase voltage-type inverter connects the direct current of the power electronics tractive transformer
Outlet side；The exchange outlet side of the three-phase voltage-type inverter is drawn by the midpoint of three bridge arms, and described in connection
Traction electric machine.
6. traction drive topological structure according to claim 1, which is characterized in that each DC/DC transformation is single
The input side of member is mutually isolated, and the input side of each AC/DC converter unit is connected with by-pass switch, and the by-pass switch is used
In in corresponding AC/DC converter unit or DC/DC converter unit failure, the AC/DC converter unit or DC/DC are converted single
Member switches out the power electronics tractive transformer.
7. traction drive topological structure according to claim 1, which is characterized in that the three-phase voltage-type inverter
Including several, and the control mode of every three-phase voltage-type inverter is identical；Pass through three-phase described in Frequency conversion control
Voltage source inverter makes the three-phase voltage-type inverter output sinusoidal current.
8. traction drive topological structure according to claim 1, which is characterized in that the traction electric machine is that permanent magnetism is same
Walk traction electric machine.
9. traction drive topological structure according to claim 1, which is characterized in that the DC/DC converter unit is
Two-way isolated DC/DC converter unit.
10. traction drive topological structure according to claim 1, which is characterized in that the AC/DC converter unit is
H bridge topological structure, all AC/DC converter units share a boost inductance.
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| CN111654197A (en) * | 2020-06-04 | 2020-09-11 | 中车青岛四方车辆研究所有限公司 | Bidirectional isolation type energy conversion system and control method thereof |
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