CN106411166A - Modular multi-level converter hybrid bridge arm topology structure - Google Patents
Modular multi-level converter hybrid bridge arm topology structure Download PDFInfo
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- CN106411166A CN106411166A CN201611026962.XA CN201611026962A CN106411166A CN 106411166 A CN106411166 A CN 106411166A CN 201611026962 A CN201611026962 A CN 201611026962A CN 106411166 A CN106411166 A CN 106411166A
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Classifications
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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
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses an MMC hybrid bridge arm topology structure with the ability of direct current side short-circuit current blocking, which belongs to the technical field of power electronics. The MMC bridge arm is composed of two kinds of sub-modules mixed in a certain proportion, and has buffer inductance. According to the output characteristic of different types of sub-modules of MMC, three-level double half bridge sub-modules and four-level series twin sub-modules form the hybrid bridge arm in a design proportion, which reduces the number of sub-modules and the number of peripheral devices at the same voltage level. The number of the sub-modules is designed, and at the same time the ability of direct current side short-circuit current blocking is realized. The number of controllable devices is reduced. The cost and loss of a converter are reduced. The overall efficiency is improved. In normal operation, two kinds of sub-modules share similar control, and the design of a control algorithm is relatively simple.
Description
Technical field
The invention belongs to electric and electronic technical field is and in particular to a kind of mould with dc-side short-circuit current blocking ability
Block Multilevel Inverters (i.e. MMC, the application calls MMC in the following text) mix bridge arm topological.
Background technology
Modular multi-level converter (MMC) have modularized design, expansibility is good, individual devices switching frequency is low,
Many advantages, such as harmonic performance is good, it has also become the one preferred technique scheme of voltage-source type current conversion station topology.Modular multilevel unsteady flow
The basic topology of device each phase brachium pontis is as shown in figure 1, brachium pontis and lower brachium pontis two parts can be divided into, it usually needs in upper and lower bridge
Connect respectively in arm a buffer inductance, to limit short circuit current during bridge arm direct pass.Upper and lower brachium pontis is respectively by N number of submodule
It is composed in series, if DC bus-bar voltage is VDC, then the voltage that each submodule bears in normal work isSubmodule divides
For unipolarity submodule and bipolarity submodule, half-bridge submodule is typical unipolarity submodule, as shown in Fig. 2 exportable
Positive level and zero level；Full-bridge submodule is typical ambipolar submodule, as shown in figure 3, exportable positive level, zero level and
Negative level.In D.C. high voltage transmission (HVDC) field, it is safeguards system that current conversion station has dc-side short-circuit current blocking ability
The important requirement of safe operation, forms the modular multi-level converter switching device number of brachium pontis using unipolarity submodule
Few, running efficiency of system is higher, but due to negative level can not be exported, cannot fault restriction electricity when DC side is short-circuited fault
Stream, does not have blocking ability；Negative level can be exported using the modular multi-level converter that bipolarity submodule forms brachium pontis,
Backward voltage can be provided when DC side is short-circuited fault, thus limiting to fault current, but in identical voltage
Under grade, the switching device number that it needs is more, and system loss is larger, relatively costly.Existing scholar proposes to adopt unipolarity
Submodule and bipolarity submodule collectively constitute brachium pontis, and adopt many level submodule topology to ensure that short circuit current blocks to reach
Reduce the purpose of system loss and cost while ability, but and non-optimal topological project.
Content of the invention
Current transformer brachium pontis for solving to have direct-current short circuit current blocking ability in prior art is lost big, high cost asking
Topic, the application discloses a kind of modular multi-level converter mixing bridge arm topological structure.
The present invention specifically employs the following technical solutions：
A kind of modular multi-level converter mixing bridge arm topological structure, described modular multi-level converter mixing brachium pontis
It is divided into brachium pontis and lower brachium pontis two parts；It is characterized in that：
Upper and lower brachium pontis respectively Shuangzi module is connected by the double half-bridge submodule of X three level with Y four level and 1 delay
Rush inductance to constitute；Wherein, the double half-bridge submodule of three level connects Shuangzi module number than satisfaction with four level：
The present invention further includes following preferred version：
The double half-bridge submodule of described three level is by first to fourth 4 full control switching device (S11、S12、S21、S22) and the
First, the second two electric capacity (C1、C2) constitute；Wherein, 4 full control switching device (S11、S12、S21、S22) be sequentially connected in series, the first electricity
Hold C1Control switching device S complete with first11Control switching device S complete with second12Series arm in parallel, the second electric capacity C2Complete with the 3rd
Control switching device S21Control switching device S complete with the 4th22Series arm in parallel；First, second full control switching device S11、S12Mutually
Mend conducting, the three, the 4th full control switching device S21、S22Complementary conducting；As the first full control switching device S12Control switch complete with the 3rd
Device S21During conducting, the double half-bridge submodule of this three level is in bypass condition.
Four described level series connection Shuangzi modules are by the 5th to the 9th 5 full control switching device (S31、S32、S41、S42、Sc)、
One power diode (D) and the three, the 4th electric capacity (C3、C4) constitute；Wherein, the 5th full control switching device S31Entirely control with the 6th
Switching device S32Series connection, the 7th full control switching device S41With eight convergent points control switching device S42Series connection, the 3rd electric capacity C3Complete with the 5th
Control switching device S31Control switching device S complete with the 6th32Series arm in parallel, the 4th electric capacity C2With the 7th full control switching device
S41With eight convergent points control switching device S42Series arm in parallel, the 3rd electric capacity C3With the 4th electric capacity C4Between by the 9th full control switch
Device ScIntersect with power diode D and be connected, and pass through the 9th full control switching device S during the positive circulation of electric currentc, electric current reverse flow
Pass through power diode D when logical；5th full control switching device S31Control switching device S complete with the 6th32Complementary conducting, the 7th controls entirely
Switching device S41With eight convergent points control switching device S42Complementary conducting.
During normal work, the 9th full control switching device Sc is held on；As the 5th full control switching device S32, the 7th full control opens
Close device S41Control switching device S complete with the 9thcDuring conducting, this submodule is in bypass condition；When direct-current short circuit fault occurs,
5th to the 9th 5 full control switching device (S31、S32、S41、S42、Sc) all lockings.
In four described level series connection Shuangzi modules, the 5th to eight convergent points control switching device S31、S32、S41、S42Have identical
Electric pressure, the 9th full control switching device ScIt is the 5th to eight convergent points control switching device S with power diode D31、S32、S41、
S42The twice of electric pressure.
The present invention has following beneficial technique effect：
Using four level series connection Shuangzi modules employ less full control switching device (5) ,+2V can be exportedC、+
VC、0、-2VCFour level, the demand of output level when both having met normal work, and short circuit current blocking ability is maximized,
And device cost is down to minimum；For coordinating ambipolar four level series connection Shuangzi modules, unipolarity submodule employs three electricity
Flat double half-bridge submodule, in normal work, connects the full control switching device S of electric capacity in four level series connection Shuangzi modulescKeep
Conducting, two seed module have similar topology so that the design comparison of integral control algorithm is simple, many level submodule simultaneously
Save the quantity of peripheral component under identical electric pressure, reduce system cost；Two seed module adopt design proportion
Constitute mixing brachium pontis, for considering the optimum topological project of dc-side short-circuit current blocking ability, system effectiveness and cost.
Brief description
Fig. 1 modular multi-level converter MMC single-phase brachium pontis basic topology schematic diagram；
Fig. 2 existing unipolarity half-bridge submodule topology schematic diagram；
Fig. 3 existing bipolarity full-bridge submodule topology schematic diagram；
Three level double half-bridge submodule topology schematic diagram that Fig. 4 present invention adopts；
The four level series connection Shuangzi module topology schematic diagrames that Fig. 5 present invention adopts；
The mixing bridge arm topological schematic diagram of Fig. 6 present invention.
Specific embodiment
The present invention is described in detail below in conjunction with the accompanying drawings.
The present invention proposes a kind of MMC mixing bridge arm topological with dc-side short-circuit current blocking ability, single-phase brachium pontis
It is divided into brachium pontis and lower brachium pontis, connected Shuangzi module and one by the double half-bridge submodule of X three level four level individual with Y respectively
Buffer inductance forms.
Three level double half-bridge submodule topology that the present invention adopts is as shown in figure 4, by first to fourth 4 full control derailing switches
Part (S11、S12、S21、S22) and first, second two electric capacity (C1、C2) constitute；Wherein, 4 full control switching device (S11、S12、
S21、S22) be sequentially connected in series, the first electric capacity C1Control switching device S complete with first11Control switching device S complete with second12Series arm
Parallel connection, the second electric capacity C2Control switching device S complete with the 3rd21Control switching device S complete with the 4th22Series arm in parallel；Firstth,
Two full control switching device S11、S12Complementary conducting, the three, the 4th full control switching device S21、S22Complementary conducting；When the first full control is opened
Close device S12Control switching device S complete with the 3rd21During conducting, the double half-bridge submodule of this three level is in bypass condition.If electric capacity is electric
Press as VC, then this submodule can export+2VC、+VC, 0 three level.
The four level series connection Shuangzi module topology that the present invention adopts are as shown in figure 5, the 5th to the 9th 5 controls switching device entirely
(S31、S32、S41、S42、Sc), a power diode (D) and the three, the 4th electric capacity (C3、C4) constitute；Wherein, the 5th full control is opened
Close device S31Control switching device S complete with the 6th32Series connection, the 7th full control switching device S41With eight convergent points control switching device S42Series connection,
3rd electric capacity C3Control switching device S complete with the 5th31Control switching device S complete with the 6th32Series arm in parallel, the 4th electric capacity C2With
7th full control switching device S41With eight convergent points control switching device S42Series arm in parallel, the 3rd electric capacity C3With the 4th electric capacity C4It
Between by the 9th full control switching device ScIntersect with power diode D and be connected, and by the 9th full control switch during the positive circulation of electric current
Device Sc, during electric current reverse circulated, pass through power diode D；5th full control switching device S31Control switching device S complete with the 6th32Mutually
Mend conducting, the 7th full control switching device S41With eight convergent points control switching device S42Complementary conducting.During normal work, entirely control derailing switch
Part ScIt is held on.During normal work, the 9th full control switching device ScIt is held on；As the 5th full control switching device S32, the 7th
Full control switching device S41Control switching device S complete with the 9thcDuring conducting, this submodule is in bypass condition；When direct-current short circuit occurs
During fault, the 5th to the 9th 5 full control switching device (S31、S32、S41、S42、Sc) all lockings, no matter electric current flows forward or backwards
Dynamic, this submodule the 3rd electric capacity C3, the 4th electric capacity C4It is serial connection charge state, export negative level.If capacitance voltage is VC, then
This submodule can export+2VC、+VC、0、-2VCFour level.
The MMC mixing bridge arm topological with dc-side short-circuit current blocking ability proposed by the present invention is respectively by X three electricity
Flat double half-bridge submodules are connected with Y four level Shuangzi module and a buffer inductance upper and lower brachium pontis of composition, two seed module
Quantitative proportion meetAs shown in Figure 6.
In normal work, connect the full control switching device S of electric capacity in four level series connection Shuangzi modulescIt is held on, two
Seed module has similar topology so that the design comparison of integral control algorithm is simple, and many level submodule is identical simultaneously
Save the quantity of peripheral component under electric pressure, reduce system cost；When DC side is short-circuited fault, Suo Youquan
Control switching device locking, the negative voltage maximum of brachium pontis output is more than ac line voltage maximum, thus playing to short circuit current
Restriction effect.Two seed module adopt design proportion to constitute mixing brachium pontis, both ensure that dc-side short-circuit current blocking ability, with
When improve system effectiveness, reduce the holistic cost of system.
Present invention applicant describes in detail to the present invention with reference to Figure of description and describes, but art technology
It should be understood that above example is only the preferred embodiments of the invention, explanation in detail is intended merely to help reader more personnel
Understand well present invention spirit, and not limiting the scope of the invention, any made based on the spirit of the present invention
Improvement or modify all should be within protection scope of the present invention.
Claims (5)
1. a kind of modular multi-level converter mixing bridge arm topological structure, described modular multi-level converter mixing brachium pontis divides
For upper brachium pontis and lower brachium pontis two parts；It is characterized in that：
Upper and lower brachium pontis respectively Shuangzi module connect by the double half-bridge submodule of X three level with Y four level and 1 buffer electric
Sense is in series.
2. modular multi-level converter mixing bridge arm topological structure as claimed in claim 1 it is characterised in that：
Wherein, the double half-bridge submodule of three level connects Shuangzi module number than satisfaction with four level：
3. modular multi-level converter mixing bridge arm topological structure as claimed in claim 1 or 2 it is characterised in that：
The double half-bridge submodule of described three level is by first to fourth 4 full control switching device (S11、S12、S21、S22) and first,
The second two electric capacity (C1、C2) constitute；Wherein, 4 full control switching device (S11、S12、S21、S22) be sequentially connected in series, the first electric capacity C1
Control switching device S complete with first11Control switching device S complete with second12Series arm in parallel, the second electric capacity C2Open with the 3rd full control
Close device S21Control switching device S complete with the 4th22Series arm in parallel；First, second full control switching device S11、S12Complementation is led
Logical, the three, the 4th full control switching device S21、S22Complementary conducting；As the first full control switching device S12With the 3rd full control switching device
S21During conducting, the double half-bridge submodule of this three level is in bypass condition.
4. modular multi-level converter mixing bridge arm topological structure as claimed in claim 1 or 2 it is characterised in that：
Four described level series connection Shuangzi modules are by the 5th to the 9th 5 full control switching device (S31、S12、S41、S42、Sc), one
Power diode (D) and the three, the 4th electric capacity (C3、C4) constitute；Wherein, the 5th full control switching device S31Control switch complete with the 6th
Device S32Series connection, the 7th full control switching device S41With eight convergent points control switching device S42Series connection, the 3rd electric capacity C3Open with the 5th full control
Close device S31Control switching device S complete with the 6th32Series arm in parallel, the 4th electric capacity C4Control switching device S complete with the 7th41With
Eight convergent points control switching device S42Series arm in parallel, the 3rd electric capacity C3With the 4th electric capacity C4Between by the 9th full control switching device
ScIntersect with power diode D and be connected, and pass through the 9th full control switching device S during the positive circulation of electric currentc, during electric current reverse circulated
By power diode D；5th full control switching device S31Control switching device S complete with the 6th32Complementary conducting, the 7th full control switch
Device S41With eight convergent points control switching device S42Complementary conducting；
During normal work, the 9th full control switching device ScIt is held on；As the 5th full control switching device S32, the 7th full control derailing switch
Part S41Control switching device S complete with the 9thcDuring conducting, this submodule is in bypass condition；When direct-current short circuit fault occurs, the 5th
To the 9th 5 full control switching device (S31、S32、S41、S42、Sc) all lockings.
5. modular multi-level converter mixing bridge arm topological structure as claimed in claim 4 it is characterised in that：
In four described level series connection Shuangzi modules, the 5th to eight convergent points control switching device S31、S32、S41、S42There is identical electricity
Pressure grade, the 9th full control switching device ScIt is the 5th to eight convergent points control switching device S with power diode D31、S32、S41、S42Electricity
The twice of pressure grade.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106899216A (en) * | 2017-04-12 | 2017-06-27 | 中国石油大学(华东) | A kind of the level submodules of MMC tri- topology and its capacitance voltage balance control method with direct fault current blocking ability |
| CN107222117A (en) * | 2017-05-18 | 2017-09-29 | 特变电工新疆新能源股份有限公司 | A kind of unidirectional current type modularization multi-level converter |
| CN108631633A (en) * | 2018-05-30 | 2018-10-09 | 上海海事大学 | A kind of mixing capacitance voltage type Shuangzi block coupled in series topological structure based on MMC |
| CN109067218A (en) * | 2018-09-12 | 2018-12-21 | 上海交通大学 | A kind of solid-state transformer topological structure method based on more level submodules |
| CN109120174A (en) * | 2018-09-03 | 2019-01-01 | 国网山东省电力公司潍坊供电公司 | Capacitance voltage equalization methods based on Shuangzi MMC module |
| CN109302058A (en) * | 2018-10-11 | 2019-02-01 | 昆明理工大学 | A kind of direct current-direct current Modular multilevel converter and its control method with the output of three level of class |
| CN111049407A (en) * | 2020-01-03 | 2020-04-21 | 东南大学 | Series-parallel modular multilevel converter with current-breaking capability and control method thereof |
| CN111756265A (en) * | 2020-07-28 | 2020-10-09 | 华北电力大学（保定） | Half-level MMC topological structure and modulation method thereof |
| CN112928943A (en) * | 2021-01-28 | 2021-06-08 | 东南大学 | Direct current side series connection alternating current side parallel connection type electric energy tapping device |
| CN112953274A (en) * | 2019-11-26 | 2021-06-11 | 新疆金风科技股份有限公司 | Power module and control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106899216A (en) * | 2017-04-12 | 2017-06-27 | 中国石油大学(华东) | A kind of the level submodules of MMC tri- topology and its capacitance voltage balance control method with direct fault current blocking ability |
| CN107222117A (en) * | 2017-05-18 | 2017-09-29 | 特变电工新疆新能源股份有限公司 | A kind of unidirectional current type modularization multi-level converter |
| CN108631633A (en) * | 2018-05-30 | 2018-10-09 | 上海海事大学 | A kind of mixing capacitance voltage type Shuangzi block coupled in series topological structure based on MMC |
| CN108631633B (en) * | 2018-05-30 | 2020-08-25 | 上海海事大学 | MMC-based hybrid capacitor voltage type dual-sub-module series connection topological structure |
| CN109120174A (en) * | 2018-09-03 | 2019-01-01 | 国网山东省电力公司潍坊供电公司 | Capacitance voltage equalization methods based on Shuangzi MMC module |
| CN109067218A (en) * | 2018-09-12 | 2018-12-21 | 上海交通大学 | A kind of solid-state transformer topological structure method based on more level submodules |
| CN109302058A (en) * | 2018-10-11 | 2019-02-01 | 昆明理工大学 | A kind of direct current-direct current Modular multilevel converter and its control method with the output of three level of class |
| CN112953274A (en) * | 2019-11-26 | 2021-06-11 | 新疆金风科技股份有限公司 | Power module and control method thereof |
| CN111049407A (en) * | 2020-01-03 | 2020-04-21 | 东南大学 | Series-parallel modular multilevel converter with current-breaking capability and control method thereof |
| CN111049407B (en) * | 2020-01-03 | 2021-03-02 | 东南大学 | Series-parallel modular multilevel converter with current-breaking capability and control method thereof |
| CN111756265A (en) * | 2020-07-28 | 2020-10-09 | 华北电力大学（保定） | Half-level MMC topological structure and modulation method thereof |
| CN111756265B (en) * | 2020-07-28 | 2023-09-01 | 华北电力大学（保定） | Half-level MMC topological structure and modulation method thereof |
| CN112928943A (en) * | 2021-01-28 | 2021-06-08 | 东南大学 | Direct current side series connection alternating current side parallel connection type electric energy tapping device |
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Application publication date: 20170215 |