CN106100397A - A kind of Modular multilevel converter - Google Patents

A kind of Modular multilevel converter Download PDF

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Publication number
CN106100397A
CN106100397A CN201610700617.3A CN201610700617A CN106100397A CN 106100397 A CN106100397 A CN 106100397A CN 201610700617 A CN201610700617 A CN 201610700617A CN 106100397 A CN106100397 A CN 106100397A
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China
Prior art keywords
input
module
conversion module
public
outfan
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CN201610700617.3A
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CN106100397B (en
Inventor
张春涛
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Huawei Digital Power Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • 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
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without 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
    • H02M7/217—Conversion of ac power input into dc power output without 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
    • H02M7/219—Conversion of ac power input into dc power output without 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 in a bridge configuration
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)

Abstract

The embodiment of the invention discloses a kind of Modular multilevel converter, including: Input transformation module, output transform module and public conversion module；The input of Input transformation module connects Input voltage terminal VinOutfan, the outfan of Input transformation module connects the public input of public conversion module, and the energy storage filter unit outfan of Input transformation module connects the energy storage filter unit outfan of output transform module；The input of output transform module connects the public input of public conversion module, and the outfan of output transform module connects output voltage terminal VoutInput；The public output of public conversion module connects described VinInput and described VoutOutfan.Use the embodiment of the present invention, there is the device loss that can reduce circuit, reduce the cost that realizes of circuit structure function, the advantage improving the suitability of circuit structure.

Description

A kind of Modular multilevel converter
Technical field
The present invention relates to electron electric power field, particularly relate to a kind of Modular multilevel converter.
Background technology
Uninterrupted power source (English: uninterruptible power supply, UPS) is to take over civil power when having a power failure to hold The equipment of continuous supply electric power.Containing energy-storage module in UPS, continue supply electric power when city's electrical anomaly or commercial power interruption, it is ensured that The safety and reliability of user power utilization, can avoid the loss brought because of city's electrical anomaly to user.Modular multilevel converter (English: modular multilevel converter, MMC) converts as the ac/dc in UPS and AC/DC becomes The power conversion unit changed.MMC topology uses tandem type, modular, it is not necessary to power device is directly connected just available many The stepped-up voltage of level, has relatively low dU/dt and relatively low voltage harmonic content, has in medium/high pressure hicap Wide application prospect.
Prior art one, if Fig. 1, Fig. 1 are structural representations of MMC.MMC is made up of commutating circuit and output loop, Wherein, commutating circuit includes rectification just half loop and rectification negative half period loop, output loop include exporting just half loop and Output negative half period loop.In prior art one, each loop is made up of N number of module, DC voltage VdcCarry out N decile, each Module undertakes Vdc1/N, reduce device pressure grade.But, in prior art one, there is N number of module in each loop, each Between loop separate, be independent of each other so that the power cell quantity of whole circuit structure is many, the volume of circuit structure is big, Manufacturing cost is high.
Prior art two, if Fig. 2, Fig. 2 are another structural representations of MMC.MMC is by commutating circuit and output loop group Become, do not differentiate between just half loop and negative half period loop, reduce the volume of circuit structure.Each loop is made up of N number of module, DC voltage VdcCarrying out N decile, each module undertakes Vdc1/N, reduce the pressure grade of device and the volume of MMC module and Loss etc..But, in prior art two, the power cell quantity comprised in circuit structure is many so that the device loss of circuit Greatly, the suitability is low.
Summary of the invention
The application provides a kind of Modular multilevel converter, by reducing commutating circuit and the device of inversion circuit, and can Reduce the device loss of circuit, reduce the cost that realizes of circuit structure function, improve the suitability of circuit structure.
This application provides a kind of Modular multilevel converter, it comprises the steps that
Input transformation module, output transform module and public conversion module；
The rectification of described Input transformation module and described public conversion module comprising modules multi-level converter MMC is returned Road, described Input transformation module is for regulating the voltage variety of the output voltage of described commutating circuit, described public conversion mould Block is for regulating the starting point voltage of the output voltage of described commutating circuit in described commutating circuit；
Described output transform module and described public conversion module form the inversion circuit of described MMC, described output transform Module is for regulating the voltage variety of the output voltage of described inversion circuit, and described public conversion module is in described inversion Loop regulates the starting point voltage of the output voltage of described inversion circuit；
The input of described Input transformation module connects Input voltage terminal VinOutfan, described Input transformation module defeated Going out end and connect the public input of described public conversion module, the energy storage filter unit outfan of described Input transformation module connects The energy storage filter unit outfan of described output transform module；
The input of described output transform module connects the public input of described public conversion module, described output transform The outfan of module connects output voltage terminal VoutInput；
The public output of described public conversion module connects described VinInput and described VoutOutfan.
The application is shared by the conversion module of commutating circuit and inversion circuit, decreases in the circuit structure of MMC Conversion module quantity, and then decrease the volume of MMC circuit structure, reduce the device power consumption of MMC, enhance the suitability of MMC.
In conjunction with the application, in the implementation that the first is possible, described public conversion module comprises M son conversion mould Block, described M is the integer more than or equal to 2；
Public as described public conversion module of the input of the first sub-conversion module in described M sub-conversion module Input, the outfan of described first sub-conversion module connects the defeated of the second sub-conversion module in described M sub-conversion module Entering end, the outfan of described second sub-conversion module is as the public output of described public conversion module.
The public conversion module of the application can comprise one or more, can improve input or the output voltage of output loop Controllability, improve circuit structure design multiformity, strengthen MMC the suitability.
In conjunction with the implementation that the first is possible, in the implementation that the second is possible, described Input transformation module and Described output transform module is full-bridge submodule, and each sub-conversion module in described public conversion module is full-bridge submodule Block；
Described full-bridge submodule is by power switch pipe T1, T2, T3 and T4, and capacitor C composition；
Wherein, the first network of T1 is connected with second network of T2 and is connected the end input as full-bridge submodule, The first network of T3 is connected and connects the end outfan as full-bridge submodule with second network of T4, second network of T1 with C positive pole, second network of T3 are connected and connect the end energy storage filter unit outfan as described full-bridge submodule, the of T2 One network and the first network of the negative pole of C, T4 are connected and to be connected end defeated as the energy storage filter unit of described full-bridge submodule Enter end.
The application modules uses full-bridge submodule, can reduce the quantity of the module of circuit structure, reduces circuit structure Volume, reduce circuit structure complexity.
In conjunction with the implementation that the second is possible, in the implementation that the third is possible, described Input transformation module is Full-bridge submodule A, described full-bridge submodule A are by power switch pipe T11, T21, T31 and T41, and capacitor C1 composition；
Described output transform module is full-bridge submodule B, and described full-bridge submodule B is by power switch pipe T12, T22, T31 And T41, and capacitor C2 composition；
Wherein, the first network of T31 is connected and connects the end output as full-bridge submodule A with second network of T41 End and the input of full-bridge submodule B；
The first network of T11 is connected with second network of T21 and is connected the end input as full-bridge submodule A, T11 The second network and second network of C1 positive pole, T31 be connected and be connected end and filter single as the energy storage of described full-bridge submodule A Unit's outfan, the first network of T21 is connected with the first network of the negative pole of C1, T41 and is connected end as described full-bridge submodule The energy storage filter unit input of block A；
The first network of T12 is connected with second network of T22 and is connected the end outfan as full-bridge submodule B, T12 The second network and second network of C2 positive pole, T31 be connected and be connected end and filter single as the energy storage of described full-bridge submodule B Unit's outfan, the first network of T22 is connected with the first network of the negative pole of C2, T41 and is connected end as described full-bridge submodule The energy storage filter unit input of block B.
Input transformation module is closed by the application with identical part of devices in the full-bridge submodule of output transform module And, the number of devices of circuit structure can be reduced, reduce the volume of circuit structure, reduce the complexity of circuit structure.
In conjunction with the application, in the 4th kind of possible implementation, described Input transformation module includes the first Input transformation Module and the second Input transformation module, described output transform module includes the first output transform module and the second output transform mould Block, described public conversion module includes the first public conversion module and the second public conversion module；
Described first Input transformation module and described first public conversion module form rectification just half circumference of described MMC Road, described second Input transformation module and described second public conversion module form the rectification negative half period loop of described MMC；
Described first output transform module and described first public conversion module form inversion just half circumference of described MMC Road, described second output transform module and described second public conversion module form the inversion negative half period loop of described MMC；
The input of described first Input transformation module connects described VinOutfan, described first Input transformation module Outfan is connected with the input of described first output transform module, and connects the first public of described first public conversion module Input, the energy storage filter unit outfan of described first Input transformation module and the energy storage filter of described first output transform module Ripple unit outfan is connected, and the outfan of described first output transform module connects described VoutInput, described first public First public output ground connection of conversion module；
The outfan of described second Input transformation module connects described VinInput, described second Input transformation module Input is connected with the outfan of described second output transform module, and connects the second public of described second public conversion module Outfan, the energy storage filter unit input of described second Input transformation module and the energy storage filter of described second output transform module Ripple unit input is connected, and the input of described second output transform module connects described VoutOutfan, described second public Second public input end grounding of conversion module.
Commutating circuit and inversion circuit also can be respectively provided with positive/negative half loop of input and output positive/negative half by the application Loop, has been suitable for the feature of the circuit structure of existing MMC, enhances the suitability of the circuit structure that the application provides.
In conjunction with the 4th kind of possible implementation, in the 5th kind of possible implementation, described first public conversion mould Block comprises M sub-conversion module, and described M is the integer more than or equal to 2；
The input of the first sub-conversion module in described M sub-conversion module is as described first sub public conversion module The first public input, the second son that the outfan of described first sub-conversion module connects in described M sub-conversion module becomes The input of die change block, the outfan of described second sub-conversion module is first public defeated as described first public conversion module Go out end.
The public conversion module in rectification/inversion just half loop in the MMC circuit structure that the application provides can comprise One or more, can improve the controllability of the output voltage of input or output loop, improves the various of circuit structure design Property, strengthen the suitability of MMC.
In conjunction with the 4th kind of possible implementation, in the 6th kind of possible implementation, described second public conversion mould Block comprises M sub-conversion module；
The input of the first sub-conversion module in described M sub-conversion module is as described second public conversion module The second public input, the second son that the outfan of described first sub-conversion module connects in described M sub-conversion module becomes The input of die change block, the outfan of described second sub-conversion module is second public defeated as described second public conversion module Go out end.
The public conversion module in rectification/inversion negative half period loop in the MMC circuit structure that the application provides can comprise One or more, can improve the controllability of the output voltage of input or output loop, strengthens the suitability of MMC.
In conjunction with the 5th kind of possible implementation or the 6th kind of possible implementation, the 7th kind of possible realization side In formula, described first Input transformation module and described first output transform module are common positive negative bus half-bridge submodule, described Each sub-conversion module in first public conversion module is common positive negative bus half-bridge submodule；
Described half-bridge submodule is by power switch pipe T1 and T2, and capacitor C composition；
Wherein, the first network of T1 is connected with second network of T2 and is connected the end input as half-bridge submodule, Second network of T1 is connected with C positive pole and is connected the end energy storage filter unit outfan as half-bridge submodule, the first of T2 Network is connected with the negative pole of C and is connected the end outfan as half-bridge submodule.
In rectification/inversion just half loop of the MMC that the application provides, modules also can use half-bridge submodule, is suitable for The feature of the circuit structure of existing MMC, enhances the suitability of the circuit structure that the application provides.
In conjunction with the 7th kind of possible implementation, in the 8th kind of possible implementation, described first Input transformation mould The energy storage filter of the half-bridge submodule of the energy storage filter unit outfan of the half-bridge submodule of block and described first output transform module Ripple unit outfan is connected；
The outfan of the half-bridge submodule of described first Input transformation module and the half-bridge of described first output transform module The input of submodule is connected, and connects the first public input of described first public conversion module.
The Input transformation module of rectification just half loop and the output transform module of inversion just half loop are entered by the application Row network-side connects and outfan connects, and outfan connects public conversion module, can simplify the circuit structure of MMC, reduces The complexity of circuit structure.
In conjunction with the 5th kind of possible implementation or the 6th kind of possible implementation, the 9th kind of possible realization side In formula, described second Input transformation module and described second output transform module are common positive negative bus half-bridge submodule, described Each sub-conversion module in second public conversion module is common positive negative bus half-bridge submodule；
Described half-bridge submodule is by power switch pipe T1 and T2, and capacitor C composition；
Wherein, the first network of T1 is connected with second network of T2 and is connected the end outfan as half-bridge submodule, Second network of T1 is connected with C positive pole and is connected the end input as half-bridge submodule, the first network of T2 and the negative pole of C It is connected and connects the end energy storage filter unit input as half-bridge submodule.
In the rectification/inversion negative half period loop of the MMC that the application provides, modules also can use half-bridge submodule, is suitable for The feature of the circuit structure of existing MMC, enhances the suitability of the circuit structure that the application provides.
In conjunction with the 9th kind of possible implementation, in the tenth kind of possible implementation, described second Input transformation mould The energy storage filter of the half-bridge submodule of the energy storage filter unit input of the half-bridge submodule of block and described second output transform module Ripple unit input is connected；
The input of the half-bridge submodule of described second Input transformation module and the half-bridge of described second output transform module The outfan of submodule is connected, and connects the second public output of the second public conversion module.
The Input transformation module in rectification negative half period loop and the output transform module in inversion negative half period loop are entered by the application Row network-side connects and outfan connects, and outfan connects public conversion module, can simplify the circuit structure of MMC, reduces The complexity of circuit structure.
The implementation possible in conjunction with the third or the tenth kind of possible implementation, the 11st kind of possible realization In mode, the output voltage of commutating circuit or inversion circuit=starting point voltage+voltage variety.
The application regulates the output electricity of rectification/inversion circuit by input/output conversion module and public conversion module Pressure, has adapted to the function needs of MMC, and the suitability is high.
In conjunction with the implementation that the second is possible, in the 11st kind of possible implementation, in described full-bridge submodule The energy storage filter unit comprised is the capacitor C comprised in described full-bridge submodule；
Described energy storage filter unit outfan is the anode connection terminal of described C, and described energy storage filter unit input is institute The negative pole stating C connects end.
In conjunction with the 7th kind of possible implementation or the 7th kind of possible implementation, the 12nd kind of possible realization side In formula, the energy storage filter unit comprised in described half-bridge submodule is the capacitor C comprised in described half-bridge submodule；
Described energy storage filter unit outfan is the anode connection terminal of described C, and described energy storage filter unit input is institute The negative pole stating C connects end.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, required in embodiment being described below The accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only some embodiments of the present invention, right From the point of view of those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain it according to these accompanying drawings His accompanying drawing.
Fig. 1 is a structural representation of existing MMC；
Fig. 2 is another structural representation of existing MMC；
Fig. 3 is the structural representation of ups system；
One structural representation of the MMC that Fig. 4 provides for the embodiment of the present invention；
Another structural representation of the MMC that Fig. 5 provides for the embodiment of the present invention；
Fig. 6 is a structural representation of full-bridge submodule；
Fig. 7 is another structural representation of full-bridge submodule；
Another structural representation of the MMC that Fig. 8 provides for the embodiment of the present invention；
Another structural representation of the MMC that Fig. 9 provides for the embodiment of the present invention；
The operation principle schematic diagram of the MMC that Figure 10 provides for the embodiment of the present invention；
Figure 11 is another structural representation of existing MMC；
Figure 12 is a structural representation of half-bridge submodule；
Figure 13 is another structural representation of half-bridge submodule；
Figure 14 is another structural representation of half-bridge submodule；
Another structural representation of the MMC that Figure 15 provides for the embodiment of the present invention；
Another structural representation of the MMC that Figure 16 provides for the embodiment of the present invention；
Figure 17 is another structural representation of existing MMC.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise Embodiment, broadly falls into the scope of protection of the invention.
In implementing, if Fig. 3, Fig. 3 are the structural representations of ups system.The embodiment of the present invention provide UPS generally by The part compositions such as battery, charger, STS (English: Static Transfer Switch, STS) and MMC.Its In, MMC includes rectifying conversion unit and inversion converter unit composition.Battery is for main input end (the i.e. V at ups systemin) There is provided input for MMC when input is abnormal, and export powering load by MMC.Charger is for the V at ups systeminInput Being supplied to MMC time normal is battery charging, concrete, the V of ups systeminWhen inputting normal, rectifying conversion unit and inversion conversion The DC voltage V of buffering between unitdcCharged the battery by charger.STS is for providing for UPS when MMC output abnormality Stand-by power supply passage, for load supplying.Wherein, the rectification in the MMC that above-mentioned rectifying conversion unit is provided by the embodiment of the present invention The modules composition comprised in loop, in the inversion circuit of the MMC that described inversion converter unit is provided by the embodiment of the present invention The modules composition comprised.Below in conjunction with accompanying drawing, the MMC in UPS is specifically described.
See Fig. 4, be a structural representation of the MMC that the embodiment of the present invention provides.The MMC that the embodiment of the present invention provides, Including: Input transformation module 91, output transform module 92 and public conversion module 93.
The input V of above-mentioned Input transformation module 91911Connect Input voltage terminal VinOutfan, Input transformation module 91 Outfan V912Connect the public input V of public conversion module 93931, the energy storage filter unit output of Input transformation module 91 End V913Connect the energy storage filter unit outfan of output transform module 92.
The input V of above-mentioned output transform module 92921Connect the public input V of public conversion module 93931, output becomes The outfan that die change is 92 pieces connects V922Meet output voltage terminal VoutInput.The i.e. energy storage filter unit of output transform module 92 is defeated Go out end to be connected with the energy storage filter unit outfan of Input transformation module 91, set up Input transformation module 91 and output transform module The connection of 92.
The public output V of above-mentioned public conversion module 93933Connect VinInput and VoutOutfan.
In the embodiment that some are feasible, input circuit (i.e. commutating circuit) bag of the MMC that the embodiment of the present invention provides Containing Input transformation module 91 and public conversion module 93, wherein, public conversion module 93 is the public bridge shared with output loop Arm.Input transformation module 91 is for regulating the voltage variety of the output voltage of commutating circuit, and public conversion module 93 is used for adjusting The starting point voltage of the output voltage of joint commutating circuit.Public conversion module 93 accesses defeated by the on-off control of power switch pipe Enter/output loop.When public conversion module 93 accesses input circuit, Input transformation module 91 shares the part electricity of commutating circuit Pressure, public conversion module 93 shares another part voltage of commutating circuit.In input circuit, current trend is the most square To, by Input voltage terminal VinFlow to Input transformation module 91, then flowed to public conversion module 93 by Input transformation module 91, finally Return Input voltage terminal Vin.Output loop (i.e. inversion circuit) comprises output transform module 92 and public conversion module 93, wherein, Public conversion module 93 is the public brachium pontis shared with input circuit.Output transform module 92 is for regulating the output of inversion circuit The voltage variety of voltage, public conversion module 93 is for regulating the starting point voltage of the output voltage of inversion circuit.Public change When die change block 93 accesses output loop, output transform module 92 shares a part of voltage of output loop, public conversion module 93 Share another part voltage of output loop.In output loop, current trend is counterclockwise, and output electric current is by public change Die change block 93 flows to output transform module 92.In the MMC electric current that the embodiment of the present invention provides, public conversion module 93 is public Brachium pontis, the electric current of input circuit is clockwise flow in public conversion module 93, and the electric current of output loop is at public conversion module Counterclockwise flow in 93, the sense of current on public conversion module 93 is contrary, and then cancels out each other so that public conversion module 93 On electric current be zero so that the power consumption on public conversion module 93 is substantially zeroed.The power consumption of MMC is only left Input transformation module 91 With the power consumption in output transform module 92, reduce the consumption of MMC.Additionally, the embodiment of the present invention by input circuit except defeated Enter other conversion modules in addition to output transform module in other conversion modules, with output loop outside conversion module It is integrated into public conversion module so that in MMC circuit structure, the quantity of device is an Input transformation module, an output transform Module and public conversion module.Sharing by conversion module, decreases the quantity of conversion module in MMC circuit structure, enters And decrease the volume of MMC circuit structure, reduce the device power consumption of MMC circuit structure, enhance the suitability of MMC.
In the embodiment that some are feasible, above-mentioned public conversion module comprises M sub-conversion module.Such as Fig. 5, Fig. 5 Another structural representation for the MMC that the embodiment of the present invention provides.Assume that the conversion module that input circuit comprises is N number of, then may be used Except Input transformation module 91 is (such as switch module (English: the switch in Fig. 5 in N number of module that input circuit is comprised Module, SM) A1) outside (N-1) individual module merge into public conversion module 93, i.e. M=N-1.Now, public conversion module 93 comprise (N-1) individual sub-conversion module so that in MMC circuit structure the quantity of device be an Input transformation module, one defeated Go out (N-1) individual sub-conversion module of conversion module and public conversion module, i.e. the number of devices in MMC circuit structure is (N+1) Individual.If N is 2, i.e. M is equal to 1, and the most above-mentioned public conversion module 93 is a conversion module.If N is more than 2, i.e. M is more than 1, then go up State the individual sub-conversion module of (N-1) comprised in public conversion module 93 by being connected in series.Wherein, first sub-conversion module The input of (i.e. the first sub-conversion module in (N-1) individual sub-conversion module, the SM2 as in Fig. 5) is as public conversion module The public input of 93 connects outfan and the input of output transform module 92 of Input transformation module 91.The outfan of SM2 Connect the defeated of the sub-conversion module of next stage (i.e. the second sub-conversion module in (N-1) individual sub-conversion module, the SM3 as in Fig. 5) Enter end.In above-mentioned (N-1) individual sub-conversion module last (i.e. the 3rd sub-conversion module in (N-1) individual sub-conversion module, SMn as in Fig. 5) outfan as public conversion module 93 public output connect public network (i.e. power supply), SMn's Input connects the outfan of the sub-conversion module of upper level (i.e. (N-1) individual sub-conversion module).In implementing, if N=3, The most public conversion module 93 only comprises two sub-conversion modules, and now, above-mentioned second sub-conversion module is empty.First son conversion The input of module connects the input of the 3rd sub-conversion module as the public input of public conversion module, its outfan. The outfan of the 3rd sub-conversion module is as the public output of public conversion module.
In implementing, each conversion module in above-mentioned Fig. 5, is complete including Input transformation module and output transform module Bridge submodule, each sub-conversion module in public conversion module is full-bridge submodule.Wherein, as Fig. 6, Fig. 6 be full-bridge One structural representation of module.Full-bridge submodule is by 4 power switch pipe T1 ', T2 ', T3 ' and T4 ', and capacitor Ci ' group Become.By controlling T1 ', T2 ', T3 ' and the break-make of T4 ', it is achieved the charging to capacitor Ci '.If Fig. 7, Fig. 7 are full-bridge submodules Another structural representation.Full-bridge submodule by power switch pipe T1 ', T2 ', T3 ' and the T4 ' of 4 band anti-paralleled diodes, with And capacitor Ci ' composition.The first network (such as emitter stage) of T1 ' is connected with second network (such as colelctor electrode) of T2 ' and is connected The first network of input Vi1 ', T3 ' as full-bridge submodule is held to be connected and connect end as entirely with second network of T4 ' Second network of the outfan Vi2 ', T1 ' of bridge submodule is connected with second network of C ' positive pole, T3 ' and is connected end as entirely The energy storage filter unit outfan of bridge submodule, the first network of T2 ' is connected with the first network of the negative pole of C ', T4 ' and connects Connect and hold the energy storage filter unit input as full-bridge submodule.That is, full-bridge submodule comprises energy storage filter unit, this energy storage Filter unit is electric capacity C ', the most extremely energy storage filter unit outfan of electric capacity C ', and electric capacity C ' negative pole is that energy storage filter unit is defeated Enter end.
Wherein, if T1 ', T2 ', T3 ' and T4 ' are insulated gate bipolar transistor (English: Insulated Gate Bipolar Transistor), IGBT), then the first network of T1 ', T2 ', T3 ' and T4 ' can be T1 ', T2 ', T3 ' and T4 ' Emitter stage, second network of T1 ', T2 ', T3 ' and T4 ' can be the colelctor electrode of T1 ', T2 ', T3 ' and T4 '.If T1 ', T2 ', T3 ' and T4 ' is that mos field effect transistor is (English: metallic oxide semiconductor field Effecttransistor, MOSFET), then the first network of T1 ', T2 ', T3 ' and T4 ' can be the source of T1 ', T2 ', T3 ' and T4 ' Pole, second network of T1 ', T2 ', T3 ' and T4 ' can be the drain electrode of T1 ', T2 ', T3 ' and T4 '.That is, T1 ', T2 ', T3 ' and T4's ' First network and the second network can determine according to concrete type of device, do not limit at this.Its described in the embodiment of the present invention First network and second network of his each power switch pipe are also similar to, and repeat no more below.
Wherein, as a example by N is 2, such as another structural representation that Fig. 8, Fig. 8 are MMC.Input transformation module is full-bridge submodule Block 1, full-bridge submodule 1 is by power switch pipe T11, T21, T51 and T61 of 4 band anti-paralleled diodes, and capacitor C1 group Become.Output transform module is full-bridge submodule 2, full-bridge submodule B by the power switch pipe T12 of 4 band anti-paralleled diodes, T22, T52 and T62, and capacitor C2 composition.Wherein, the first network (such as emitter stage) of T51 and T61 the second network (as Colelctor electrode) connect and connect the end outfan as full-bridge submodule 1, the first network (such as emitter stage) of T52 and T62 Second network (such as colelctor electrode) connects and connects end as the input with full-bridge submodule 2.That is, Input transformation module is complete The input of the outfan of bridge submodule 1 and the full-bridge submodule 2 of output transform module is connected with each other, and connects public conversion mould The input of block.The number of devices of MMC can be saved further, reduce the circuit structure volume of MMC.Additionally, the first network of T11 It is connected with second network of T21 and is connected the end input as full-bridge submodule 1, second network of T11 and C1 positive pole, Second network of T51 is connected, and the first network of T21 is connected with the first network of the negative pole of C1, T61, and the positive pole junction point of C1 is made Energy storage filter unit outfan for full-bridge submodule 1.Wherein, above-mentioned energy storage filter unit can be C1, and energy storage filter unit is defeated Go out the positive pole that end can be C1.The first network of T12 is connected with second network of T22 and is connected end as full-bridge submodule 2 Outfan, second network of T12 is connected with the second network of C2 positive pole, T52, the first network of T22 and the negative pole of C2, T62 First network is connected, and the positive pole junction point of C2 is as the energy storage filter unit outfan of full-bridge submodule 2.That is, full-bridge submodule 1 Being connected with the energy storage filter unit outfan of full-bridge submodule 2, the public network as full-bridge submodule connects end, above-mentioned full-bridge The public network of submodule connects the positive pole V of the dc bus of end concretely MMCdc+。
In fig. 8, public conversion module is full-bridge submodule C.Full-bridge submodule C as the conversion module of input circuit, Its input connects the outfan of full-bridge submodule 1, and its outfan passes through inductance connection VinThe second network and VoutThe second net Network.The input of full-bridge submodule 1 connects VinFirst network.Full-bridge submodule C is as the conversion module of output loop, and it is defeated Going out end and connect the input of full-bridge submodule 2, input passes through inductance connection VinThe V of the second network sumoutSecond network.Entirely The outfan of bridge submodule 2 connects VoutFirst network.Wherein, VinFirst network can be VinOutfan, such as VinJust Pole；VinThe second network can be VinInput, such as VinNegative pole.VoutFirst network can be VoutOutfan, such as Vout Positive pole,
VoutThe second network can be VoutInput, such as VoutNegative pole.
Further, in the embodiment that some are feasible, Input transformation module and output transform module are full-bridge During module, the device in Input transformation module and output transform module can also share, and further realizes sharing of device. Such as another structural representation that Fig. 9, Fig. 9 are MMC.Input transformation module is full-bridge submodule A as shown in the figure, full-bridge submodule A By power switch pipe T11, T21, T31 and T41 of 4 band anti-paralleled diodes, and capacitor C1 composition.Output transform module For full-bridge submodule B, full-bridge submodule B by power switch pipe T12, T22, T31 and T41 of 4 band anti-paralleled diodes, and Capacitor C2 forms.
Wherein, the first network (such as emitter stage) of T31 is connected with second network (such as colelctor electrode) of T41 and connects end work Outfan and the input of full-bridge submodule B for full-bridge submodule A.That is, Input transformation module and output transform module is complete Bridge submodule can share power switch pipe T31 and T41, can save the number of devices of MMC further, reduces the circuit structure of MMC Volume.Additionally, the first network of T11 is connected with second network of T21 and is connected the end input as full-bridge submodule A, Second network of T11 is connected with second network of C1 positive pole, T31 and is connected the end energy storage filtering list as full-bridge submodule A Unit's outfan, the first network of T21 is connected with the first network of the negative pole of C1, T41 and is connected end as full-bridge submodule A's Energy storage filter unit input.The first network of T12 is connected with second network of T22 and is connected end as full-bridge submodule B Outfan, second network of second network of T12 and C2 positive pole, T31 is connected and is connected the end storage as full-bridge submodule B Energy filter unit outfan, the first network of T22 is connected with the first network of the negative pole of C2, T41 and is connected end as full-bridge The energy storage filter unit input of submodule B.That is, the energy storage filter unit outfan phase of full-bridge submodule A and full-bridge submodule B Even.
In fig .9, public conversion module is full-bridge submodule C.Wherein, the input of full-bridge submodule C connects the of T31 The connection end of second network of one network and T41.That is, full-bridge submodule C is as the conversion module of input circuit, and its input is even Connecing the outfan of full-bridge submodule A, its outfan passes through inductance connection VinThe second network and VoutThe second network.Full-bridge The input of modules A connects VinFirst network.Full-bridge submodule C connects as the conversion module of output loop, its outfan The input of full-bridge submodule B, input passes through inductance connection VinThe V of the second network sumoutSecond network.Full-bridge submodule B Outfan connect VoutFirst network.
In embodiments of the present invention, it is the operation principle schematic diagram of MMC such as Figure 10, Figure 10.The input voltage of MMC is one Stepped sine wave shaped voltage, below by illustrating as a example by the positive half cycle voltage of sine wave shaped voltage, enters as a example by N=6 Row explanation.The input circuit of the MMC that the embodiment of the present invention provides is by Input transformation module and two kinds of module groups of public conversion module Becoming, output loop is made up of output transform module and two kinds of modules of Input transformation module.Wherein, in input circuit, input becomes Die change block and public conversion module undertake different effects.In like manner, in output loop, output transform module and public conversion mould Block undertakes different effects.Input transformation module or output transform module are all as a example by " conversion module " below, public conversion Module will illustrate as a example by " public module ".
Conversion module: produced the high frequency variable quantity of 1/N*bus by HF switch change, by controlling the size of dutycycle Regulation input voltage variable quantity or output voltage variable quantity.Wherein, the variable quantity of input variable quantity or output voltage is minimum It is zero, is 1/N*bus to the maximum.
Public module: determined the operation interval scope of input/output voltage, regulation input/defeated by low frequency switch change Go out the starting point voltage of voltage.Wherein, the starting point voltage minimum zero of input/output voltage, it is (N-1)/N*bus to the maximum.
The output voltage in input/output loop=(conversion module is certainly to play point voltage (public module decision)+voltage variety Fixed).
As shown in Figure 10, whole positive half cycle voltage is divided into 6 intervals (I～VI), and public module decision-making circuit is operated in I ～one of them interval, six intervals of IV, conversion module then determines the high frequency variable quantity in this interval.Wherein, public module bag Containing N number of sub-conversion module, the quantity accessing the sub-conversion module in input circuit or output loop in N number of sub-conversion module is determined Determine circuit and be operated in one of them interval, six intervals of I～IV.
It is described as follows as a example by interval I and interval VI:
Operation interval I: by public module on-off control, access circuit (i.e. all sons of public module without public brachium pontis Conversion module does not accesses circuit), i.e. circuit output starting point is zero, and whole circuit output voltage is determined by conversion module.Now Circuit output area is 0～1/6*bus, and owing to the magnitude of voltage of interval I is minimum, 0～1/6*bus can meet output voltage.
Operation interval VI: by public module on-off control, all public brachium pontis (i.e. all sub-conversion mould of public module Block) all access circuits, i.e. circuit output starting point is 5/6*bus, the 0～1/6*bus of superposition conversion module on this basis.I.e. Whole circuit output voltage is together decided on by public module and conversion module, and now circuit output area is 5/6*bus～6/6* Bus, owing to the magnitude of voltage of interval IV is maximum, 5/6*bus～6/6*bus can meet output voltage.
II～V operation principle is identical, is summarized as follows:
Operation interval I: circuit output starting point is 0, and output voltage range is 0～1/6*bus；
Operation interval II: circuit output starting point is 1/6*bus, and output voltage range is 1/6*bus～2/6*bus；
Operation interval III: circuit output starting point is 2/6*bus, and output voltage range is 2/6*bus～3/6*bus；
Operation interval IV: circuit output starting point is 3/6*bus, and output voltage range is 3/6*bus～4/6*bus；
Operation interval V: circuit output starting point is 4/6*bus, and output voltage range is 4/6*bus～5/6*bus；
Operation interval VI: circuit output starting point is 5/6*bus, and output voltage range is 5/6*bus～6/6*bus.
Voltage negative half cycle operation principle is identical with above-mentioned positive half cycle, not repeated description at this.
It should be noted that in embodiments of the present invention, input circuit and output loop share public conversion module, public The submodule quantity of conversion module needs to determine according to the output voltage demand of output loop, and the phase place of input voltage needs defeated Going out voltage to determine, therefore, the voltage of input circuit and the voltage of output loop need to ensure as in-phase voltage.The embodiment of the present invention (also referred to as inversion is returned to realize input circuit (also becoming commutating circuit) and output loop by public conversion module (the most public brachium pontis) Road) module share, i.e. input circuit and output loop have public loop, can reduce the number of devices of MMC, reduce MMC Device power consumption.
Seeing Fig. 2, in the prior art, commutating circuit is made up of N number of module such as SMA1, SMA2 ..., SMAn, and inversion is returned N number of module compositions such as route SMU1, SMU2 ..., SMUn.The annexation phase of modules in commutating circuit and inversion circuit Seemingly, below annexation and dividing potential drop mode to modules as a example by commutating circuit is described.
Such as Fig. 2, the input (the end 1-1 as in Fig. 2) of first the Input transformation module (i.e. SMA1) in commutating circuit By inductance connection Input voltage terminal VinOutfan, the energy storage filter unit outfan (the end 1-3 as in Fig. 2) of SMA1 connects The energy storage filter unit outfan of SMU1, the outfan (the end 1-2 as in Fig. 2) of SMA1 connects next stage conversion module (i.e. SMA2) input (the end 2-1 as in Fig. 2).The outfan of the next stage Input transformation module (i.e. SMA2) of SMA1 is (such as Fig. 2 In end 2-2) connect the input (the end 2-1 as in Fig. 2) of its next stage conversion module (such as SMA3), be sequentially connected with realization each The series connection of individual module.The input of afterbody Input transformation module (SMAn as in Fig. 2) connects upper level Input transformation mould The outfan of block, the outfan of SMAn connects Input voltage terminal VinInput, the energy storage filter unit input of SMAn connects The energy storage filter unit input of SMUn.If N is 2, the input of SMA2 connects the outfan of SMA1, and the outfan of SMA2 passes through Inductance connection Input voltage terminal VinThe second network, the network-side of SMA2 connects public network.
In implementing, as a example by N is 2, such as another structural representation that Figure 11, Figure 11 are existing MMC.If shown in Fig. 2 Existing structure in commutating circuit and inversion circuit each Input transformation module all use full-bridge submodule, then available such as figure MMC structure shown in 11.Wherein, each conversion module series connection in commutating circuit, in inversion circuit, each conversion module is also connected. In MMC circuit structure shown in Figure 11, the quantity of full-bridge submodule is 2N (N is 2), the merit comprised in single full-bridge submodule The quantity of rate switching tube is 4, and therefore, in MMC circuit structure, number of devices is more.N is the biggest, and the number of devices in circuit structure is more Greatly, circuit structure volume is the biggest, and during MMC work, device power consumption is big, and the suitability is low.In summary, in prior art, MMC comprises Number of modules be 2N, N be the integer more than or equal to 2.The number of modules that the MMC that the embodiment of the present invention provides comprises is (N + 1), far fewer than the 2N shown in Fig. 2.Wherein, N is the biggest, and (N+1) is the biggest with the quantity gap of 2N.
In the embodiment that some are feasible, in the MMC that the embodiment of the present invention shown in Fig. 4 provides, modules also can be adopted Using half-bridge submodule, i.e. Input transformation module and output transform module is half-bridge submodule, each height in public conversion module Conversion module is half-bridge submodule.
If Figure 12, Figure 12 are structural representations of half-bridge submodule.Half-bridge submodule is by 2 band anti-paralleled diodes Power switch pipe T1 and T2, and capacitor C (such as Ci in figure) composition.Wherein, Vi1 (i.e. the connection ends of two switching tubes) is half The input (or outfan) of bridge submodule, Vi2 (i.e. the negative pole of capacitor Ci connects end) is the outfan of half-bridge submodule (or input), by controlling the break-make of T1 and T2, it is achieved the charging to capacitor Ci.Additionally, the positive pole of capacitor Ci is even Connecing and hold the energy storage filter unit outfan as half-bridge submodule, wherein, capacitor Ci is that the energy storage filtering of half-bridge submodule is single Unit.
If Figure 13, Figure 13 are structural representations of half-bridge submodule.Half-bridge submodule is by 2 band anti-paralleled diodes Power switch pipe T1 and T2, and capacitor C (such as Ci in figure) composition.Wherein, Vi1 (i.e. the anode connection terminal of capacitor Ci) is The input (or outfan) of half-bridge submodule, Vi2 (i.e. the connection ends of two switching tubes) is the outfan of half-bridge submodule (or input), by controlling the break-make of T1 and T2, it is achieved the charging to capacitor Ci.Additionally, the negative pole of capacitor Ci is even Connecing and hold the energy storage filter unit input as half-bridge submodule, wherein, capacitor Ci is that the energy storage filtering of half-bridge submodule is single Unit.
In implementing, the half-bridge submodule shown in Figure 12 is applicable to the positive half cycle of rectification and the circuit structure of inversion negative half period The input of middle electric current and output relation, the half-bridge submodule shown in Figure 13 is applicable to rectification negative half period and the circuit of the positive half cycle of inversion In structure, the input of electric current and output relation, specifically can determine according to actual application scenarios demand, not limit at this.Below will In conjunction with Figure 14, with the half-bridge submodule shown in Figure 12 in order to be specifically described.Figure 14 is that another structure of half-bridge submodule is shown It is intended to.Such as Figure 14, the first network of the T1 of half-bridge submodule is connected with second network of T2 and is connected end as half-bridge submodule Second network of the input Vi1, T1 of block and C positive pole are connected and to be connected end defeated as the energy storage filter unit of half-bridge submodule Going out and hold Vi3, the first network of T2 is connected with the negative pole of Ci and is connected the end outfan Vi2 as half-bridge submodule.
See another structural representation that Figure 15, Figure 15 are MMC.In circuit structure shown in Figure 15, modules uses half Bridge submodule, input circuit includes inputting just half loop and input negative half period loop, input just half loop and input negative half The structure of loop is identical, will illustrate below as a example by input just half loop.Output loop also includes exporting positive half cycle Loop and output negative half period loop, wherein, output just half loop is the most identical with the circuit structure in output negative half period loop, below To illustrate as a example by output just half loop.Wherein, output just half loop is corresponding to input just half loop, and output is just Half loop and input just half loop comprise common return between the two respectively.
In implementing, Input transformation module includes the first Input transformation module 1311 (SMA1+ as in Figure 15) and Two Input transformation modules 1312 (SMA1-as in Figure 15), wherein, the first Input transformation module 1311 is the positive half cycle of input The Input transformation module comprised in loop, the second Input transformation module 1312 is in input negative half period loop the input comprised and becomes Die change block.Public conversion module includes the first public conversion module 1331 and the second public conversion module 1332, and wherein, first is public Co-variation die change 1331 is in input just half loop the public conversion module comprised, and the second public conversion module 1332 is defeated Enter the public conversion module comprised in negative half period loop.Output transform module includes that the first output transform module 1321 and second is defeated Going out conversion module 1322, wherein, the first output transform module 1321 is in output just half loop the output transform mould comprised Block, the second output transform module 1322 is in output negative half period loop the output transform module comprised.First Input transformation mould Block 1311 and the first public conversion module 1331 composition input just half loop, the second Input transformation module 1312 and first is public Conversion module 1332 composition input negative half period loop.First output transform module 1321 and the first public conversion module 1331 form Output just half loop, the second output transform module 1322 and the first public conversion module 1332 composition output negative half period loop.
In implementing, the input of above-mentioned first Input transformation module 1331 connects VinFirst network (i.e. VinJust Pole, following VinThe second network be VinNegative pole), the outfan of the first Input transformation module 1331 and the first output transform mould The input of block 1321 connects, and connects the first public input of the first public conversion module 1331, the first Input transformation mould The energy storage filter unit outfan of block 1311 and the energy storage filter unit outfan of the first output transform module 1321 connect public First public network end of network, the outfan of the first output transform module 1331 connects VoutFirst network (i.e. VoutJust Pole, following VoutThe second network be its negative pole), the first public output ground connection of the first public conversion module 1331.Second is defeated The outfan entering conversion module 1312 connects VinThe second network, the input of the second Input transformation module 1312 and second output The outfan of conversion module 1322 connects, and connects the second public output of the second public conversion module 1332, the second input The energy storage filter unit input of conversion module 1312 and the energy storage filter unit input of the second output transform module 1322 are even Connecing, the input of the second output transform module 1322 passes through inductance connection VoutThe second network, the second public conversion module 1332 The second public input end grounding.
In implementing, the first public conversion module 1331 and the second public conversion module 1332 all can comprise one or Many sub-conversion module, an i.e. M conversion module, wherein, M is the integer more than or equal to 2.As shown in figure 15, input is just The input (end 11 as in figure) of the SMA1+ in half loop passes through inductance connection Input voltage terminal VinFirst network, The energy storage filter unit outfan (end 13 as in Fig. 1) of SMA1+ connects the energy storage filter unit outfan of SMU1+ (in figure not Illustrate).The outfan (end 12 as in figure) of SMA1+ connects the public input of the first public conversion module 1331, specifically may be used Input (end 21 as in figure) for next stage conversion module (i.e. SMA2+).Wherein, in rectification just half loop, first The outfan of public conversion module 1331 is earth terminal.The second public conversion module 1332 in rectification negative half period loop public defeated Enter to hold ground connection, i.e. the earth terminal in rectification just half loop and rectification negative half period loop is public connecting end.It should be noted that In rectification just half loop, the output termination of last conversion module (i.e. SMAn+) in the first public conversion module 1331 Ground, in rectification negative half period loop, the output termination of second public last conversion module of conversion module 1332 (i.e. SMAn-) Ground, input connects the outfan of a upper conversion module (i.e. SMA (n-1)-)).The next stage Input transformation module of SMA1+ The outfan (end 22 as in figure) of (i.e. SMA2+) connects the input of next stage conversion module (such as SMA3+) (such as the end in figure 21), it is sequentially connected with and realizes the series connection of modules.If it should be noted that N is 2, the input of SMA2+ connects the defeated of SMA1+ Go out end, the output head grounding of SMA2+.
It should be noted that such as Figure 15, in input just half loop and input negative half period loop, input current is up time Flowing in pin direction, flows the most from top to bottom.Such as, in rectification just half loop, electric current is flowed to SMAn+ by SMA1+, in rectification In negative half period loop, electric current is flowed to SMA1-by SMAn-.In output just half loop and output negative half period loop, input current For counterclockwise flowing, flow the most from the bottom up.Such as, in output just half loop, electric current is flowed to SMU1+ by SMUn+, In output negative half period loop, electric current is flowed to SMUn-by SMU1-.
See another structural representation that Figure 16, Figure 16 are MMC.Above-mentioned modules all uses half-bridge submodule, wherein, N is 2.In the structure shown in Figure 16, the energy storage filter unit outfan of the half-bridge submodule of the first Input transformation module 1311 It is connected with the energy storage filter unit outfan of the half-bridge submodule of the first output transform module 1321, i.e. the first Input transformation mould The energy storage filter unit outfan of the half-bridge submodule of block 1311 and the first output transform module 1321 is common point (i.e. capacitor Positive pole be connected).The outfan of the half-bridge submodule of the first Input transformation module 1311 and the first output transform module 1321 The input of half-bridge submodule is connected, and connects the first public input of the first public conversion module.Second Input transformation mould The energy storage filter unit input of the half-bridge submodule of block 1312 and the storage of the half-bridge submodule of the second output transform module 1322 Can be connected by filter unit input, the i.e. second Input transformation module 1312 and half-bridge submodule of the second output transform module 1322 Energy storage filter unit input be the common point negative pole of capacitor (i.e. be connected).Half-bridge of the second Input transformation module 1312 The outfan of the input of module and the half-bridge submodule of the second output transform module 1322 is connected, and connects the second sub public change Second public output of die change block 1332.
The device comprised in circuit structure shown in Figure 15 is that 2 Input transformation modules (include the first Input transformation module With the second Input transformation module) and 2 output transform modules (including the first output transform module and the second output transform module) With 6 modules such as 2 public conversion modules (including the first public conversion module and the second public conversion module).If 2 public Conversion module comprises (N-1) individual sub-conversion module respectively, then the number of devices comprised in MMC circuit structure is (2N+2).
Seeing Fig. 1, in the prior art, the rectification of MMC just half loop is by N number of mould such as SMA1+, SMA2+ ..., SMAn+ Block forms, and rectification negative half period loop is made up of N number of module such as SMA1-, SMA2-..., SMAn-, and output just half loop is by SMU1 +, SMU2+ ..., N number of module such as SMUn+ composition, output negative half period loop is by N number of module group such as SMU1-, SMU2-..., SMUn- Become.
In implementing, as a example by N is 2, such as another structural representation that Figure 17, Figure 17 are existing MMC.Rectification just half In loop, each Input transformation module is half-bridge submodule, and each Input transformation block coupled in series.Rectification negative half period returns In road, each Input transformation module is also half-bridge submodule, and each Input transformation block coupled in series.MMC electricity shown in Fig. 6 In line structure, the quantity of half-bridge submodule is 4N, and number of devices is many, and circuit structure volume is big, device power consumption during MMC work Greatly, the suitability is low.From the foregoing, it will be observed that the number of modules comprised in existing MMC is 4N, N is the integer more than or equal to 2.By Being the integer more than or equal to 2 in N, in the MMC circuit structure that therefore embodiment of the present invention provides, the quantity of device is
(2N+2), much smaller than number of devices 4N comprised in the circuit structure shown in Fig. 1.N is the biggest, difference the most between the two Away from the biggest.The MMC structure that the embodiment of the present invention provides greatly reduces the quantity of device, reduces the device consumption of circuit structure With the design difficulty of circuit structure, the suitability is high.
In figure 16, the first public conversion module and the second public conversion module can be all a half-bridge submodule, and (output just half loop and output are negative with output loop to be input circuit (input just half loop and input negative half period loop) Half loop) common return.In input circuit, Input transformation module is shared Input transformation loop and is processed the direct current mother obtained Line voltage Vdc1/N, Input transformation module separates with public conversion module, determines DC bus-bar voltage by Input transformation module VdcChange in voltage amplitude, and by public conversion module determine DC bus-bar voltage VdcVoltage starting point.Wherein, input becomes Die change block ensures DC bus-bar voltage VdcChange in voltage amplitude be 1/N, i.e. the single ladder of stepped sine wave shaped voltage is high Degree.The quantity of the sub-conversion module comprised in public conversion module decides DC bus-bar voltage VdcVoltage starting point on which rank Ladder height, wherein, the sub-conversion module comprised in public conversion module increases by one then can make DC bus-bar voltage VdcElectricity Pressure starting point increases 1/N.In like manner, in output loop, output transform module ensures that the change in voltage amplitude of output voltage is 1/N, That is, the single ladder height of stepped sine wave shaped voltage.The quantity of the sub-conversion module comprised in public conversion module determines The voltage starting point of output voltage at which ladder height, wherein, the sub-conversion module comprised in public conversion module increases by one Individual, the voltage starting point of output voltage can be made to increase 1/N.
Wherein, the input that the voltage positive half cycle operation principle of above-mentioned input just half loop is corresponding with above-mentioned full-bridge submodule Voltage positive half cycle operation principle in loop is identical, the voltage negative half cycle operation principle in input negative half period loop and above-mentioned full-bridge Voltage negative half cycle operation principle in the input circuit that module is corresponding is identical, not repeated description at this.Above-mentioned output just half circumference Voltage positive half cycle operation principle phase in the output loop that the voltage positive half cycle operation principle on road is corresponding with above-mentioned full-bridge submodule Together, the voltage negative in the output loop that the voltage negative half cycle operation principle in output negative half period loop is corresponding with above-mentioned full-bridge submodule Half cycle operation principle is identical, not repeated description at this.
It should be noted that in embodiments of the present invention, input circuit and output loop share public conversion module (first The public conversion module of son or the second sub public conversion module), the submodule quantity of public conversion module needs according to exporting back The output voltage demand on road determines, the phase place of input voltage needs output voltage and determines, therefore, and the voltage of input circuit and defeated The voltage going out loop needs to ensure as in-phase voltage.The embodiment of the present invention is realized by public conversion module (the most public brachium pontis) The module of input circuit (also becoming commutating circuit) and output loop (also referred to as inversion circuit) shares, i.e. input circuit and exporting back There is public loop on road, it is adaptable to use the circuit structure of half-bridge submodule, can reduce the number of devices of MMC, reduces the device of MMC Part power consumption.
Term " first ", " second ", " the 3rd " and " the 4th " in the description of the present invention, claims and accompanying drawing Etc. being for distinguishing different object rather than for describing particular order.Additionally, term " includes " and " having " and they appoint What deformation, it is intended that cover non-exclusive comprising.Such as contain series of steps or the process of unit, method, system, Product or equipment are not limited to step or the unit listed, but the most also include step or the list do not listed Unit, or the most also include other steps intrinsic for these processes, method, system, product or equipment or unit.
One of ordinary skill in the art will appreciate that all or part of flow process realizing in above-described embodiment method, be permissible Instructing relevant hardware by computer program to complete, described program can be stored in a computer read/write memory medium In, this program is upon execution, it may include such as the flow process of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic Dish, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc..
The above disclosed present pre-ferred embodiments that is only, can not limit the right model of the present invention with this certainly Enclose, the equivalent variations therefore made according to the claims in the present invention, still belong to the scope that the present invention is contained.

Claims (12)

1. a Modular multilevel converter, it is characterised in that including: Input transformation module, output transform module and public Conversion module；
Described Input transformation module and the commutating circuit of described public conversion module comprising modules multi-level converter MMC, institute Stating Input transformation module for regulating the voltage variety of the output voltage of described commutating circuit, described public conversion module is used for The starting point voltage of the output voltage of described commutating circuit is regulated in described commutating circuit；
Described output transform module and described public conversion module form the inversion circuit of described MMC, described output transform module For regulating the voltage variety of the output voltage of described inversion circuit, described public conversion module is at described inversion circuit The starting point voltage of the output voltage of the described inversion circuit of middle regulation；
The input of described Input transformation module connects Input voltage terminal VinOutfan, the outfan of described Input transformation module Connecting the public input of described public conversion module, the energy storage filter unit outfan of described Input transformation module connects described The energy storage filter unit outfan of output transform module；
The input of described output transform module connects the public input of described public conversion module, described output transform module Outfan connect output voltage terminal VoutInput；
The public output of described public conversion module connects described VinInput and described VoutOutfan.
2. Modular multilevel converter as claimed in claim 1, it is characterised in that described public conversion module comprises M Sub-conversion module, described M is the integer more than or equal to 2；
The input of the first sub-conversion module in described M sub-conversion module is as the public input of described public conversion module End, the outfan of described first sub-conversion module connects the input of the second sub-conversion module in described M sub-conversion module, The outfan of described second sub-conversion module is as the public output of described public conversion module.
3. Modular multilevel converter as claimed in claim 2, it is characterised in that described Input transformation module and described defeated Going out conversion module is full-bridge submodule, and each sub-conversion module in described public conversion module is full-bridge submodule；
Described full-bridge submodule is by power switch pipe T1, T2, T3 and T4, and capacitor C composition；
Wherein, the first network of T1 is connected with second network of T2 and is connected the end input as full-bridge submodule, T3's First network is connected and connects the end outfan as full-bridge submodule with second network of T4, and second network of T1 is with C just Pole, second network of T3 are connected and connect the end energy storage filter unit outfan as described full-bridge submodule, the first of T2 Network is connected with the first network of the negative pole of C, T4 and is connected the end energy storage filter unit input as described full-bridge submodule End.
4. Modular multilevel converter as claimed in claim 3, it is characterised in that described Input transformation module is full-bridge Modules A, described full-bridge submodule A is by power switch pipe T11, T21, T31 and T41, and capacitor C1 composition；
Described output transform module is full-bridge submodule B, described full-bridge submodule B by power switch pipe T12, T22, T31 and T41, and capacitor C2 composition；
Wherein, the first network of T31 be connected with second network of T41 and connect end as the outfan of full-bridge submodule A and The input of full-bridge submodule B；
Second network of the first network of T11 and T21 is connected and is connected the end input as full-bridge submodule A, the of T11 Two networks and second network of C1 positive pole, T31 are connected and to be connected end defeated as the energy storage filter unit of described full-bridge submodule A Going out end, the first network of T21 is connected with the first network of the negative pole of C1, T41 and is connected end as described full-bridge submodule A's Energy storage filter unit input；
Second network of the first network of T12 and T22 is connected and is connected the end outfan as full-bridge submodule B, the of T12 Two networks and second network of C2 positive pole, T31 are connected and to be connected end defeated as the energy storage filter unit of described full-bridge submodule B Going out end, the first network of T22 is connected with the first network of the negative pole of C2, T41 and is connected end as described full-bridge submodule B's Energy storage filter unit input.
5. Modular multilevel converter as claimed in claim 1, it is characterised in that described Input transformation module includes first Input transformation module and the second Input transformation module, described output transform module includes the first output transform module and the second output Conversion module, described public conversion module includes the first public conversion module and the second public conversion module；
Described first Input transformation module and described first public conversion module form rectification just half loop of described MMC, institute State the second Input transformation module and the rectification negative half period loop of the described second public conversion module described MMC of composition；
Described first output transform module and described first public conversion module form inversion just half loop of described MMC, institute State the second output transform module and the inversion negative half period loop of the described second public conversion module described MMC of composition；
The input of described first Input transformation module connects described VinOutfan, the output of described first Input transformation module End is connected with the input of described first output transform module, and connects the first public input of described first public conversion module End, the energy storage filter unit outfan of described first Input transformation module and the energy storage filtering of described first output transform module are single Unit's outfan is connected, and the outfan of described first output transform module connects described VoutInput, described first public conversion First public output ground connection of module；
The outfan of described second Input transformation module connects described VinInput, the input of described second Input transformation module End is connected with the outfan of described second output transform module, and connects the second public output of described second public conversion module End, the energy storage filter unit input of described second Input transformation module and the energy storage filtering of described second output transform module are single Unit's input is connected, and the input of described second output transform module connects described VoutOutfan, described second public conversion Second public input end grounding of module.
6. Modular multilevel converter as claimed in claim 5, it is characterised in that described first public conversion module comprises M sub-conversion module, described M is the integer more than or equal to 2；
The input of the first sub-conversion module in described M sub-conversion module is as the of described first sub public conversion module One public input, the outfan of described first sub-conversion module connects the second son conversion mould in described M sub-conversion module The input of block, the outfan of described second sub-conversion module is as the first public output of described first public conversion module End.
7. Modular multilevel converter as claimed in claim 5, it is characterised in that described second public conversion module comprises M sub-conversion module；
The input of the first sub-conversion module in described M sub-conversion module is as the second of described second public conversion module Public input, the outfan of described first sub-conversion module connects the second sub-conversion module in described M sub-conversion module Input, the outfan of described second sub-conversion module is as the second public output of described second public conversion module.
Modular multilevel converter the most as claimed in claims 6 or 7, it is characterised in that described first Input transformation module It is common positive negative bus half-bridge submodule, each in described first public conversion module with described first output transform module Sub-conversion module is common positive negative bus half-bridge submodule；
Described half-bridge submodule is by power switch pipe T1 and T2, and capacitor C composition；
Wherein, the first network of T1 is connected with second network of T2 and is connected the end input as half-bridge submodule, T1's Second network is connected with C positive pole and is connected the end energy storage filter unit outfan as half-bridge submodule, the first network of T2 It is connected with the negative pole of C and is connected the end outfan as half-bridge submodule.
9. Modular multilevel converter as claimed in claim 8, it is characterised in that the half of described first Input transformation module The energy storage filter unit of the half-bridge submodule of the energy storage filter unit outfan of bridge submodule and described first output transform module Outfan is connected；
The outfan of the half-bridge submodule of described first Input transformation module and the half-bridge submodule of described first output transform module The input of block is connected, and connects the first public input of described first public conversion module.
Modular multilevel converter the most as claimed in claims 6 or 7, it is characterised in that described second Input transformation module It is common positive negative bus half-bridge submodule, each in described second public conversion module with described second output transform module Sub-conversion module is common positive negative bus half-bridge submodule；
Described half-bridge submodule is by power switch pipe T1 and T2, and capacitor C composition；
Wherein, the first network of T1 is connected with second network of T2 and is connected the end outfan as half-bridge submodule, T1's Second network is connected with C positive pole and is connected the end input as half-bridge submodule, and the first network of T2 is connected with the negative pole of C And connect the end energy storage filter unit input as half-bridge submodule.
11. Modular multilevel converter as claimed in claim 10, it is characterised in that described second Input transformation module The energy storage filter unit input of half-bridge submodule is single with the energy storage filtering of the half-bridge submodule of described second output transform module Unit's input is connected；
The input of the half-bridge submodule of described second Input transformation module and the half-bridge submodule of described second output transform module The outfan of block is connected, and connects the second public output of the second public conversion module.
12. 1 kinds of uninterruptible power systems, it is characterised in that including: battery, charger, STS STS and such as right Require Modular multilevel converter MMC described in any one of 1-11；
Described battery is for the main input end V at uninterrupted power source ups systeminInput is provided for described MMC when input is abnormal, And export powering load by described MMC；
Described charger is for the described V at described ups systeminBeing supplied to described MMC when inputting normal is the charging of described battery；
Described STS is for providing stand-by power supply passage when described MMC output abnormality for described UPS.
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