CN105471306B - Auxiliary capacitor distribution full-bridge MMC based on inequality constraints is topological from pressure - Google Patents
Auxiliary capacitor distribution full-bridge MMC based on inequality constraints is topological from pressure Download PDFInfo
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- CN105471306B CN105471306B CN201610047423.8A CN201610047423A CN105471306B CN 105471306 B CN105471306 B CN 105471306B CN 201610047423 A CN201610047423 A CN 201610047423A CN 105471306 B CN105471306 B CN 105471306B
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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
- H02M7/49—Combination of the output voltage waveforms of a plurality of converters
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/0077—Plural converter units whose outputs are connected in series
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Abstract
The present invention provides the auxiliary capacitor distribution full-bridge MMC based on inequality constraints from pressure topology.Full-bridge MMC from pressure topology, by full-bridge MMC models and from press subsidiary loop joint mapping.Full-bridge MMC models pass through 6 in subsidiary loop with from pressure subsidiary loopNElectrical link, IGBT module triggering occur for a IGBT module, and the two constitutes the auxiliary capacitor distribution full-bridge MMC based on inequality constraints from pressure topology；IGBT module is latched, and topoligical equivalence is full-bridge MMC topologys.Full-bridge MMC is topological from pressure, DC side failure can be clamped, simultaneously independent of special Pressure and Control, it can be on the basis of completing the conversion of alternating current-direct current energy, spontaneously realize the equilibrium of submodule capacitor voltage, submodule triggering frequency and capacitor's capacity can be accordingly reduced simultaneously, realize the fundamental frequency modulation of full-bridge MMC.
Description
Technical field
The present invention relates to flexible transmission fields, and in particular to a kind of auxiliary capacitor distribution full-bridge based on inequality constraints
MMC is topological from pressure.
Background technology
Modularization multi-level converter MMC is the developing direction of the following HVDC Transmission Technology, and MMC uses submodule (Sub-
Module, SM) cascade mode constructs converter valve, and the direct series connection of big metering device is avoided, is reduced to device consistency
It is required that while being convenient for dilatation and redundant configuration.With the raising of level number, output waveform can effectively avoid low electricity close to sine
The defect of flat VSC-HVDC.
Full-bridge MMC is composed of full-bridge submodule, full-bridge submodule by four IGBT modules, a sub- module capacitance and
1 mechanical switch is constituted, and flexible operation has DC Line Fault clamping ability.
Different from two level, three level VSC, the DC voltage of full-bridge MMC is not supported by a bulky capacitor, but by
A series of mutually independent suspension submodule capacitance supported in series.In order to ensure waveform quality and the guarantee of exchange side voltage output
Each power semiconductor bears identical stress in module, also for better support DC voltage, reduces alternate circulation, must
It must ensure that submodule capacitor voltage is in the state of dynamic stability in the periodical flowing of bridge arm power.
It is that current solution full-bridge MMC Neutron module capacitance voltage equilibriums are asked that algorithm is pressed in sequence based on capacitance voltage sequence
The mainstream thinking of topic.But the realization of ranking function has to rely on the Millisecond sampling of capacitance voltage, needs a large amount of sensor
And optical-fibre channel is coordinated；Secondly, when group number of modules increases, the operand of capacitance voltage sequence increases rapidly, and is
The hardware design of controller brings huge challenge；In addition, sequence pressure algorithm realization to submodule cut-off frequency have it is very high
Requirement, cut-off frequency and be closely related with voltage equalizing, in practice process, probably due to the limitation of voltage equalizing, it has to
The increase for improving the triggering frequency of submodule, and then transverter being brought to be lost.
Document " A DC-Link Voltage Self-Balance Method for a Diode-Clamped
Modular Multilevel Converter With Minimum Number of Voltage Sensors ", it is proposed that one
Kind realizes the thinking of MMC submodule capacitor voltage equilibriums by clamp diode and transformer.But the program in design one
Determine the modular nature that degree destroys submodule, submodule capacitive energy interchange channel is also confined in phase, could not be fully sharp
Larger be transformed into is also brought along while so that control strategy is complicated with the introducing of the existing structure of MMC, three transformers
This.
Invention content
In view of the above-mentioned problems, it is an object of the invention to propose it is a kind of economy, it is modular, do not depend on and press algorithm,
Submodule triggering frequency and capacitor's capacity can be accordingly reduced simultaneously and the full-bridge MMC with DC Line Fault clamping ability is opened up from pressure
It flutters.
The specific constituted mode of the present invention is as follows.
Auxiliary capacitor distribution full-bridge MMC based on inequality constraints includes being made of A, B, C three-phase from pressure topology
Full-bridge MMC models, each bridge arm of A, B, C three-phase respectively byNA full-bridge submodule and 1 bridge arm reactor are connected in series；Including
By 6NA IGBT module, 6N+ 11 clamp diodes, 8 auxiliary capacitors, 4 pressing certainly for auxiliary IGBT module composition assist
Circuit.
The above-mentioned auxiliary capacitor distribution full-bridge MMC based on inequality constraints is from pressure topology, full-bridge MMC models, A phases
1st submodule of upper bridge arm, one IGBT module midpoint are connected with DC bus anode upwards, another IGBT module
Midpoint is connected with one IGBT module midpoint of the 2nd submodule of bridge arm in A phases downwards；The of bridge arm in A phasesiA submodule
Block, whereiniValue be 2~N- 1, one IGBT module midpoint upwards with bridge arm in A phasesi- 1 submodule one
IGBT module midpoint is connected, another IGBT module midpoint downwards with bridge arm in A phases theiOne IGBT module of+1 submodule
Midpoint is connected；The of bridge arm in A phasesNA submodule, one IGBT module midpoint downwards through two bridge arm reactors under A phases
One IGBT module midpoint of the 1st submodule of bridge arm is connected, another IGBT module midpoint upwards with bridge arm in A phasesNOne IGBT module midpoint of -1 submodule is connected；The of A phase lower bridge armsiA submodule, whereiniValue be 2~N- 1,
One IGBT module midpoint upwards with A phase lower bridge armsiOne IGBT module midpoint of -1 submodule is connected, another
IGBT module midpoint downwards with A phase lower bridge armsiOne IGBT module midpoint of+1 submodule is connected；The of A phase lower bridge armsN
A submodule, one IGBT module midpoint are connected with DC bus cathode downwards, another IGBT module midpoint is upwards and A
The of phase lower bridge armNTwo IGBT module midpoints of -1 submodule are connected.The connection side of B phases and C phase upper and lower bridge arm submodules
Formula is consistent with A.
The above-mentioned auxiliary capacitor distribution full-bridge MMC based on inequality constraints is from pressure topology, from pressure subsidiary loop,
First auxiliary capacitor and second auxiliary capacitor are in parallel by clamp diode, second auxiliary capacitor anode connection auxiliary
IGBT module, first auxiliary capacitor cathode connection clamp diode are incorporated to DC bus anode；Third auxiliary capacitor and
Four auxiliary capacitors pass through clamp diode parallel connection, third auxiliary capacitor cathode connection auxiliary IGBT module, the 4th auxiliary
Capacitance cathode connection clamp diode is incorporated to DC bus cathode；5th auxiliary capacitor and the 6th auxiliary capacitor pass through clamper
Diodes in parallel, the 5th auxiliary capacitor anode connection auxiliary IGBT module, the 6th two pole of auxiliary capacitor cathode connection clamper
Pipe is incorporated to DC bus anode；7th auxiliary capacitor and the 8th auxiliary capacitor are in parallel by clamp diode, and the 8th auxiliary
Capacitance cathode connection auxiliary IGBT module, the 7th auxiliary capacitor anode connection clamp diode is helped to be incorporated to DC bus cathode.
Clamp diode passes through the 1st sub- module capacitance and first auxiliary capacitor anode in bridge arm in IGBT module connection A phases；It is logical
Cross in IGBT module connection A phases in bridge arm theiA sub- module capacitance and thei+ 1 sub- module capacitance anode, whereiniValue be
1~N-1；The is connected in A phases in bridge arm by IGBT moduleNThe 1st sub- module capacitance of a sub- module capacitance and A phases lower bridge arm is just
Pole；It is connected the in A phase lower bridge arms by IGBT moduleiA sub- module capacitance and A phases lower bridge armi+ 1 sub- module capacitance is just
Pole, whereiniValue be 1~N-1；It is connected the in A phase lower bridge arms by IGBT moduleNA sub- module capacitance is assisted with third
Capacitance cathode.Clamp diode passes through the 1st sub- module capacitance in bridge arm in IGBT module connection B phases and second auxiliary electricity
Hold cathode；The is connected in B phases in bridge arm by IGBT moduleiA sub- module capacitance and thei+ 1 sub- module capacitance cathode, whereiniValue be 1~N-1；The is connected in B phases in bridge arm by IGBT moduleNThe 1st son of a sub- module capacitance and B phases lower bridge arm
Module capacitance cathode；It is connected the in B phase lower bridge arms by IGBT moduleiA sub- module capacitance and B phases lower bridge armi+ 1 submodule
Block capacitance cathode, whereiniValue be 2~N-1；It is connected the in B phase lower bridge arms by IGBT moduleNA sub- module capacitance and the
Four auxiliary capacitor cathode.When the connection type of clamp diode is consistent with A between C phase upper and lower bridge arm Neutron modules, the 6th
Auxiliary capacitor anode is positive through the sub- module capacitance of bridge arm first in auxiliary IGBT module, clamp diode connection C phases, the 5th
Auxiliary capacitor cathode through assist IGBT module, clamp diode connection B phases on the sub- module capacitance cathode of bridge arm first, the 8th
Auxiliary capacitor anode is through assisting IGBT module, clamp diode connection C phases lower bridge arm theNA sub- module capacitance anode, the 7th
Auxiliary capacitor cathode is through assisting IGBT module, clamp diode connection B phases lower bridge arm theNA sub- module capacitance cathode；In C phases
When the connection type of clamp diode is consistent with B between lower bridge arm Neutron module, the 5th auxiliary capacitor cathode is through assisting IGBT
The sub- module capacitance cathode of bridge arm first in module, clamp diode connection C phases, the 6th auxiliary capacitor anode is through assisting IGBT
The sub- module capacitance anode of bridge arm first in module, clamp diode connection A phases, the 7th auxiliary capacitor cathode is through assisting IGBT
Module, clamp diode connection C phases lower bridge arm theNA sub- module capacitance cathode, the 8th auxiliary capacitor anode is through assisting IGBT
Module, clamp diode connection A phases lower bridge arm theNA sub- module capacitance anode.
Description of the drawings
Fig. 1 is the structural schematic diagram of full-bridge submodule；
Fig. 2 is the auxiliary capacitor distribution full-bridge MMC based on inequality constraints topological from pressure.
Specific implementation mode
For the performance and operation principle that the present invention is further explained, below in conjunction with attached drawing to the constituted mode and work to invention
It is specifically described as principle.But the full-bridge MMC based on the principle is not limited to Fig. 2 from pressure topology.
With reference to figure 2, the auxiliary capacitor distribution full-bridge MMC based on inequality constraints is topological from pressure, including by A, B, C tri-
Mutually constitute full-bridge MMC models, each bridge arm of A, B, C three-phase respectively byNA full-bridge submodule and the series connection of 1 bridge arm reactor and
At, including by 6NA IGBT module, 6N+ 11 clamp diodes, 8 auxiliary capacitors, 4 auxiliary IGBT modules form certainly equal
Press subsidiary loop.
In full-bridge MMC models, the 1st submodule of bridge arm in A phases, one IGBT module midpoint is upwards and DC bus
Anode is connected, another IGBT module midpoint is connected with one IGBT module midpoint of the 2nd submodule of bridge arm in A phases downwards
It connects；The of bridge arm in A phasesiA submodule, whereiniValue be 2 ~N- 1, one IGBT module midpoint upwards with bridge in A phases
The of armiOne IGBT module midpoint of -1 submodule is connected, another IGBT module midpoint downwards with bridge arm in A phasesiOne IGBT module midpoint of+1 submodule is connected；The of bridge arm in A phasesNA submodule, one IGBT module midpoint to
It is upper with bridge arm in A phases theNOne IGBT module midpoint of -1 submodule is connected, another IGBT module midpoint is downwards through two
A bridge arm reactorL 0It is connected with one IGBT module midpoint of the 1st full-bridge submodule of A phase lower bridge arms；A phase lower bridge arms
TheiA submodule, whereiniValue be 2 ~N- 1, one IGBT module midpoint upwards with A phase lower bridge armsi- 1 submodule
One IGBT module midpoint of block is connected, another IGBT module midpoint downwards with A phase lower bridge armsi+ 1 submodule one
IGBT module midpoint is connected；The of A phase lower bridge armsNA submodule, one IGBT module midpoint are negative with DC bus downwards
Pole is connected, another IGBT module midpoint upwards with A phase lower bridge armsNOne IGBT module midpoint of -1 submodule is connected
It connects.B phases and the connection type of C phase upper and lower bridge arm submodules are consistent with A.
From in pressure subsidiary loop, auxiliary capacitorC 1With auxiliary capacitorC 2Pass through clamp diode parallel connection, auxiliary capacitorC 2Just
Pole connection auxiliary IGBT moduleT 1, auxiliary capacitorC 1Cathode connection clamp diode is incorporated to DC bus anode；Auxiliary capacitorC 3With
Auxiliary capacitorC 4Pass through clamp diode parallel connection, auxiliary capacitorC 3Cathode connection auxiliary IGBT moduleT 2, auxiliary capacitorC 4Anode is even
It connects clamp diode and is incorporated to DC bus cathode；Auxiliary capacitorC 5With auxiliary capacitorC 6Pass through clamp diode parallel connection, auxiliary capacitorC 5Anode connection auxiliary IGBT moduleT 3, auxiliary capacitorC 6Cathode connection clamp diode is incorporated to DC bus anode；Auxiliary capacitorC 7With auxiliary capacitorC 8Pass through clamp diode parallel connection, auxiliary capacitorC 8Cathode connection auxiliary IGBT moduleT 4, auxiliary capacitorC 7Just
Pole connection clamp diode is incorporated to DC bus cathode.Clamp diode passes through IGBT moduleT au_1Connect in A phases in bridge arm the
1 sub- module capacitanceC au_1With auxiliary capacitorC 1Anode；Pass through IGBT moduleT au_i 、T au_i+1Connect in A phases in bridge arm theiHeight
Module capacitanceC au_i Withi+ 1 sub- module capacitanceC au_i+1Anode, whereiniValue be 1~N-1；Pass through IGBT moduleT au_N 、T al_1Connect in A phases in bridge arm theNA sub- module capacitanceC au_N With the 1st sub- module capacitance of A phases lower bridge armC al_1Anode；Pass through
IGBT module Tal_i 、T al_i+1It connects the in A phase lower bridge armsiA sub- module capacitanceC al_i With A phases lower bridge armi+ 1 submodule electricity
HoldC al_i+1Anode, whereiniValue be 1~N-1；Pass through IGBT moduleT al_N It connects the in A phase lower bridge armsNA submodule electricity
HoldC al_N With auxiliary capacitorC 3Anode.Clamp diode passes through IGBT moduleT bu_11st submodule electricity in bridge arm in connection B phases
HoldC bu_1With auxiliary capacitorC 2, auxiliary capacitorC 5Cathode；Pass through IGBT moduleT bu_i 、T bu_i+1Connect in B phases in bridge arm theiHeight
Module capacitanceC bu_i Withi+ 1 sub- module capacitanceC bu_i+1Cathode, whereiniValue be 1~N-1；Pass through IGBT moduleT bu_N 、T bl_1Connect in B phases in bridge arm theNA sub- module capacitanceC bu_N With the 1st sub- module capacitance of B phases lower bridge armC bl_1Cathode；Pass through
IGBT moduleT bl_i 、T bl_i+1It connects the in B phase lower bridge armsiA sub- module capacitanceC bl_i With B phases lower bridge armi+ 1 submodule electricity
HoldC bl_i+1Cathode, whereiniValue be 1~N-1；Pass through IGBT moduleT bl_N It connects the in B phase lower bridge armsNA submodule electricity
HoldC bl_N With auxiliary capacitorC 4, auxiliary capacitorC 7Cathode.Auxiliary capacitorC 6Anode is through assisting IGBT moduleT cu_1, clamp diode connect
Connect first sub- module capacitance of bridge arm in C phasesC cu_1Anode；Auxiliary capacitorC 8Anode is through assisting IGBT moduleT cl_N , two pole of clamper
Pipe connects C phases lower bridge arm theNA sub- module capacitanceC cl_N Anode.
Under normal circumstances, from 6 in pressure subsidiary loopNA IGBT moduleT au_i 、T al_i 、T bu_i、T bl_i 、T cu_i 、T cl_i Often
It closes, whereiniValue be 1~N, first sub- module capacitance of bridge arm in A phasesC au_1When bypass, IGBT module is assisted at this timeT 1It is disconnected
It opens, submodule capacitanceC au_1With auxiliary capacitorC 1Pass through clamp diode parallel connection；Bridge arm in A phasesiA sub- module capacitanceC au_i It is other
Lu Shi, whereiniValue be 2~N, submodule capacitanceC au_i With submodule capacitanceC au_i-1Pass through clamp diode parallel connection；A phases
First sub- module capacitance of lower bridge armC al_1When bypass, submodule capacitanceC al_1Pass through clamp diode, two bridge arm reactorsL 0
With submodule capacitanceC au_N It is in parallel；A phases lower bridge armiA sub- module capacitanceC al_i When bypass, whereiniValue be 2~N, submodule
Block capacitanceC al_i With submodule capacitanceC al_i-1Pass through clamp diode parallel connection；Assist IGBT moduleT 2When closure, auxiliary capacitorC 3
Pass through clamp diode and submodule capacitanceC al_N It is in parallel.
Under normal circumstances, from 6 in pressure subsidiary loopNA IGBT moduleT au_i 、T al_i 、T bu_i、T bl_i 、T cu_i 、T cl_i Often
It closes, whereiniValue be 1~N, assist IGBT moduleT 1When closure, auxiliary capacitorC 2With submodule capacitanceC bu_1Pass through clamper two
Pole pipe is in parallel；Bridge arm in B phasesiA sub- module capacitanceC bu_i When bypass, whereiniValue be 1~N- 1, submodule capacitanceC bu_i
With submodule capacitanceC bu_i+1Pass through clamp diode parallel connection；Bridge arm in B phasesNA sub- module capacitanceC bu_N When bypass, submodule
CapacitanceC bu_N Pass through clamp diode, two bridge arm reactorsL 0With submodule capacitanceC bl_1It is in parallel；B phases lower bridge armiA submodule
Block capacitanceC bl_i When bypass, whereiniValue be 1~N- 1, submodule capacitanceC bl_i With submodule capacitanceC bl_i+1Pass through clamper two
Pole pipe is in parallel；B phases lower bridge armNA sub- module capacitanceC bl_N When bypass, submodule capacitanceC bl_N With auxiliary capacitorC 4Pass through clamper
Diodes in parallel.Wherein assist IGBT moduleT 1Trigger signal it is consistent with first submodule trigger signal of bridge arm in A phases；It is auxiliary
Help IGBT moduleT 2Trigger signal and B phases lower bridge armNThe trigger signal of a submodule is consistent.
During straight AC energy is converted, alternately input, the bypass of each submodule assists IGBT moduleT 1、T 2Alternately
It is closed, shutdown, A, B phase upper and lower bridge arm submodule capacitor voltage meet lower column constraint under the action of clamp diode：
Due to auxiliary capacitorC 1、C 2、C 3、C 4The relationship of voltage meets：
Similarly, B, C phase upper and lower bridge arm submodule capacitor voltage meet following conditions：
Due to auxiliary capacitorC 5、C 6、C 7、C 8The relationship of voltage meets：
It follows that meeting following constraint item in the dynamic process for completing straight AC energy conversion in singly clamp MMC
Part：
It is illustrated by above-mentioned it is found that full-bridge MMC topologys have submodule capacitor voltage from the ability of equalization.
Finally it should be noted that：Described embodiment is only some embodiments of the present application, rather than whole realities
Apply example.Based on the embodiment in the application, those of ordinary skill in the art are obtained without making creative work
Every other embodiment, shall fall in the protection scope of this application.
Claims (2)
1. the auxiliary capacitor distribution full-bridge MMC based on inequality constraints is topological from pressure, it is characterised in that：Including by A, B, C
Three-phase constitute full-bridge MMC models, each bridge arm of A, B, C three-phase respectively byNA full-bridge submodule and 1 bridge arm reactor series connection
It forms；Including by 6NA IGBT module, 6N+ 11 clamp diodes, 8 auxiliary capacitorsC 1、C 2、C 3、C 4、C 5、C 6、C 7、C 8, 4
Assist IGBT moduleT 1、T 2、T 3、T 4What is constituted presses subsidiary loop certainly；Wherein in full-bridge MMC models, the 1st of bridge arm in A phases
The interface of full-bridge submodule, two IGBT of one bridge arm is connected with DC bus anode, the connection of two IGBT of another bridge arm
Contact is connected with the interface of one two IGBT of bridge arm of the 2nd full-bridge submodule of bridge arm in A phases；The of bridge arm in A phasesiIt is a
Full-bridge submodule, whereiniValue be 2 ~N- 1, the interface of two IGBT of one bridge arm and of bridge arm in A phasesi- 1 complete
The interface of one two IGBT of bridge arm of bridge submodule is connected, the interface of two IGBT of another bridge arm and of bridge arm in A phasesi
The interface of+1 one two IGBT of bridge arm of full-bridge submodule is connected；The of bridge arm in A phasesNA full-bridge submodule, one bridge
The interface of two IGBT of arm and of bridge arm in A phasesNThe interface of -1 one two IGBT of bridge arm of full-bridge submodule is connected,
The interface of two IGBT of another bridge arm is through two bridge arm reactorsL 0With the 1st one bridge arm of full-bridge submodule of A phase lower bridge arms
The interface of two IGBT is connected；The of A phase lower bridge armsiA full-bridge submodule, whereiniValue be 2 ~N- 1, one bridge arm
The interface of two IGBT and the of A phase lower bridge armsiThe interface of -1 one two IGBT of bridge arm of full-bridge submodule is connected, separately
The interface of one two IGBT of bridge arm and the of A phase lower bridge armsiThe interface phase of two IGBT of+1 one bridge arm of full-bridge submodule
Connection；The of A phase lower bridge armsNThe interface of a full-bridge submodule, two IGBT of one bridge arm is connected with DC bus cathode,
The interface of two IGBT of another bridge arm and the of A phase lower bridge armsNThe interface of -1 one two IGBT of bridge arm of full-bridge submodule
It is connected；B phases and the connection type of C phase upper and lower bridge arm submodules are consistent with A；The of A, B, C phase upper and lower bridge armiA full-bridge
It is parallel with mechanical switch respectively between submodule output portK au_i ,K al_i ,K bu_i ,K bl_i ,K cu_i ,K cl_i , whereiniValue be 1 ~N；From in pressure subsidiary loop, clamp diodeD 2Cathode connects auxiliary capacitorC 2Anode, clamp diodeD 2Anode connection auxiliary
CapacitanceC 1Anode, auxiliary capacitorC 2Anode connection auxiliary IGBT moduleT 1Drain electrode, auxiliary capacitorC 1Cathode connects clamp diodeD 1Anode；Clamp diodeD 4Cathode connects auxiliary capacitorC 3Anode, clamp diodeD 4Anode connection auxiliary capacitorC 4Anode, it is auxiliary
Help capacitanceC 3Cathode connection auxiliary IGBT moduleT 2Source electrode, auxiliary capacitorC 4Anode connection clamp diodeD 3Cathode；Clamper two
Pole pipeD 6Cathode connects auxiliary capacitorC 5Anode, clamp diodeD 6Anode connection auxiliary capacitorC 6Anode, auxiliary capacitorC 5Anode
Connection auxiliary IGBT moduleT 3Drain electrode, auxiliary capacitorC 6Cathode connects clamp diodeD 5Anode；Clamp diodeD 8Cathode connects
Connect auxiliary capacitorC 8Anode, clamp diodeD 8Anode connection auxiliary capacitorC 7Anode, auxiliary capacitorC 8Cathode connection auxiliary IGBT
ModuleT 4Source electrode, auxiliary capacitorC 7Anode connection clamp diodeD 7Cathode；Clamp diodeD au_0Cathode connects auxiliary capacitorC 1Anode, clamp diodeD au_0Anode passes through IGBT moduleT au_11st full-bridge submodule capacitance in bridge arm in connection A phasesC au_1Anode, whereinT au_1Drain electrode connectionC au_1Anode,T au_1Source electrode connectsD au_0Anode；Clamp diodeD au_i Cathode passes through
IGBT moduleT au_i Connect in A phases in bridge arm theiA full-bridge submodule capacitanceC au_i Anode, clamp diodeD au_i Anode passes through
IGBT moduleT au_i+1Connect in A phases in bridge arm thei+ 1 full-bridge submodule capacitanceC au_i+1Anode, whereinT au_i Drain electrode connectionC au_i Anode,T au_i Source electrode connectsD au_i Cathode,T au_i+1Drain electrode connectionC au_i+1Anode,T au_i+1Source electrode connectsD au_i Anode,i's
Value be 1~N-1；Clamp diodeD au_N Cathode passes through IGBT moduleT au_N Connect in A phases in bridge arm theNA full-bridge submodule
CapacitanceC au_N Anode, clamp diodeD au_N Anode passes through IGBT moduleT al_1Connect the 1st full-bridge submodule electricity of A phases lower bridge arm
HoldC al_1Anode, whereinT au_N Drain electrode connectionC au_N Anode,T au_N Source electrode connectsD au_N Cathode,T al_1Drain electrode connectionC al_1Anode,T al_1Source electrode connectsD au_N Anode；Clamp diodeD al_i Cathode passes through IGBT module Tal_i It connects the in A phase lower bridge armsiIt is a complete
Bridge submodule capacitanceC al_i Anode, clamp diodeD al_i Anode passes through IGBT moduleT al_i+1Connect A phases lower bridge arm thei+ 1 complete
Bridge submodule capacitanceC al_i+1Anode, wherein Tal_i Drain electrode connectionC al_i Anode, Tal_i Source electrode connectsD al_i Cathode,T al_i+1Drain electrode
ConnectionC al_i+1Anode,T al_i+1Source electrode connectsD al_i Anode,iValue be 1~N-1；Clamp diodeD al_N Cathode passes through IGBT
ModuleT al_N It connects the in A phase lower bridge armsNA full-bridge submodule capacitanceC al_N Anode, clamp diodeD al_N Anode connection auxiliary
CapacitanceC 3Anode, whereinT al_N Drain electrode connectionC al_N Anode,T al_N Source electrode connectsD al_N Cathode；Clamp diodeD bu_0Cathode connects
Auxiliary capacitorC 2Cathode, clamp diodeD bu_0Anode passes through IGBT moduleT bu_11st full-bridge submodule in bridge arm in connection B phases
Block capacitanceC bu_1Cathode, whereinT bu_1Drain electrode connectionC bu_1Cathode,T bu_1Source electrode connectsD bu_0Anode；Clamp diodeD bu_ i It is negative
Pole passes through IGBT moduleT bu_i Connect in B phases in bridge arm theiA full-bridge submodule capacitanceC bu_i Cathode, clamp diodeD bu_ i Just
Pole passes through IGBT moduleT bu_i+1Connect in B phases in bridge arm thei+ 1 full-bridge submodule capacitanceC bu_i+1Cathode, whereinT bu_i Drain electrode
ConnectionC bu_i Cathode,T bu_i Source electrode connectsD bu_ i Cathode, T bu_i+1Drain electrode connectionC bu_i+1Cathode,T bu_i+1Source electrode connectsD bu_ i Just
Pole,iValue be 1~N-1；Clamp diodeD bu_N Cathode passes through IGBT moduleT bu_N Connect in B phases in bridge arm theNA full-bridge
Submodule capacitanceC bu_N Cathode, clamp diodeD bu_N Anode passes through IGBT moduleT bl_1Connect B phases the 1st full-bridge of lower bridge arm
Module capacitanceC bl_1Cathode, whereinT bu_N Drain electrode connectionC bu_N Cathode,T bu_N Source electrode connectsD bu_N Cathode,T bl_1Drain electrode connectionC bl_1
Cathode,T bl_1Source electrode connectsD bu_N Anode；Clamp diodeD bl_i Cathode passes through IGBT moduleT bl_i It connects the in B phase lower bridge armsi
A full-bridge submodule capacitanceC bl_i Cathode, clamp diodeD bl_i Anode passes through IGBT moduleT bl_i+1Connect B phases lower bridge arm thei+1
A full-bridge submodule capacitanceC bl_i+1Cathode, whereinT bl_i Drain electrode connectionC bl_i Cathode,T bl_i Source electrode connectsD bl_i Cathode,T bl_i+1
Drain electrode connectionC bl_i+1Cathode,T bl_i+1Source electrode connectsD bl_i Anode,iValue be 1~N-1；Clamp diodeD bl_N Cathode passes through
IGBT moduleT bl_N It connects the in B phase lower bridge armsNA full-bridge submodule capacitanceC bl_N Cathode, clamp diodeD bl_N Anode connection
Auxiliary capacitorC 4Cathode, whereinT bl_N Drain electrode connectionC bl_N Cathode,T bl_N Source electrode connectsD bl_N Cathode；Submodule in C phase upper and lower bridge arms
The connection type of clamp diode is consistent with A between block, in addition, clamp diodeD cu_0Cathode connects auxiliary capacitorC 6Anode, pincers
Position diodeD cu_0Anode connection IGBT moduleT cu_1Source electrode, auxiliary capacitorC 5Cathode connects clamp diodeD bu_0Cathode, clamper
DiodeD cl_N Anode connection auxiliary capacitorC 8Anode, clamp diodeD cl_N Cathode connects IGBT moduleT cl_N Source electrode, auxiliary electricity
HoldC 7Cathode connects clamp diodeD bl_N Anode；6 in above-mentioned A, B, C three-phaseNA IGBT module T au_i 、T al_i 、T bu_i 、T bl_i 、T cu_i 、T cl_i , whereiniValue be 1~N, 6N+ 11 clamp diodes, 8 auxiliary capacitorsC 1、C 2、C 3、C 4、C 5、C 6、C 7、C 8
And 4 auxiliary IGBT modulesT 1、T 2、T 3、T 4, collectively form and press subsidiary loop certainly.
2. the auxiliary capacitor distribution full-bridge MMC according to claim 1 based on inequality constraints is from pressure topology, special
Sign is：When normal condition, from 6 in pressure subsidiary loopNA IGBT moduleT au_i 、T al_i 、T bu_i 、T bl_i 、T cu_i 、T cl_i Often
It closes, when fault condition, 6NA IGBT moduleT au_i 、T al_i 、T bu_i 、T bl_i 、T cu_i 、T cl_i It disconnects, whereiniValue be 1~N；
Under normal circumstances, first full-bridge submodule capacitance of bridge arm in A phasesC au_1When bypass, IGBT module is assisted at this timeT 1It disconnects, submodule
Block capacitanceC au_1With auxiliary capacitorC 1Pass through clamp diode parallel connection；Bridge arm in A phasesiA full-bridge submodule capacitanceC au_i Bypass
When, whereiniValue be 2~N, submodule capacitanceC au_i With submodule capacitanceC au_i-1Pass through clamp diode parallel connection；Under A phases
First full-bridge submodule capacitance of bridge armC al_1When bypass, submodule capacitanceC al_1Pass through clamp diode, two bridge arm reactorsL 0With submodule capacitanceC au_N It is in parallel；A phases lower bridge armiA full-bridge submodule capacitanceC al_i When bypass, whereiniValue be 2~N, submodule capacitanceC al_i With submodule capacitanceC al_i-1Pass through clamp diode parallel connection；Assist IGBT moduleT 2When closure, auxiliary
CapacitanceC 3Pass through clamp diode and submodule capacitanceC al_N It is in parallel；Assist IGBT moduleT 1When closure, auxiliary capacitorC 2With submodule
Block capacitanceC bu_1Pass through clamp diode parallel connection；Bridge arm in B phasesiA full-bridge submodule capacitanceC bu_i When bypass, whereiniTake
Value for 1~N- 1, submodule capacitanceC bu_i With submodule capacitanceC bu_i+1Pass through clamp diode parallel connection；Bridge arm in B phasesNIt is a complete
Bridge submodule capacitanceC bu_N When bypass, submodule capacitanceC bu_N Pass through clamp diode, two bridge arm reactorsL 0With submodule electricity
HoldC bl_1It is in parallel；B phases lower bridge armiA full-bridge submodule capacitanceC bl_i When bypass, whereiniValue be 1~N- 1, submodule electricity
HoldC bl_i With submodule capacitanceC bl_i+1Pass through clamp diode parallel connection；B phase lower bridge armsNA full-bridge submodule capacitanceC bl_N Bypass
When, submodule capacitanceC bl_N With auxiliary capacitorC 4Pass through clamp diode parallel connection；Wherein assist IGBT moduleT 1Trigger signal with
The trigger signal of first full-bridge submodule of bridge arm is consistent in A phases；Assist IGBT moduleT 2Trigger signal and B phases lower bridge armNThe trigger signal of a full-bridge submodule is consistent；During straight AC energy is converted, each full-bridge submodule alternating input,
Bypass assists IGBT moduleT 1、T 2It is alternately closed, turns off, work of the A phase upper and lower bridge arm submodule capacitor voltages in clamp diode
Under, meet lower column constraint,U C1≥U Cau_1≥U Cau_2…≥U Cau_N ≥U Cal_1≥U Cal_2…≥U Cal_N ≥U C3；Bridge above and below B phases
Arm submodule capacitor voltage meets lower column constraint under the action of clamp diode,U C2≤U Cbu_1≤U Cbu_2…≤U Cbu_N ≤U Cbl_1≤U Cbl_2…≤U Cbl_N ≤U C4；Against auxiliary capacitorC 1、C 2Between voltage, auxiliary capacitorC 3、C 4Between voltage not
Equality constraint "U C1≤U C2,U C3≥U C4", the 4 of A, B phase upper and lower bridge armNA full-bridge submodule capacitance,C au_i 、C al_i 、C bu_i 、C bl_i , whereiniValue be 1~NAnd auxiliary capacitorC 1、C 2、C 3、C 4, voltage bridge arm in self-balancing state, topological A, B phase
Between have submodule capacitor voltage from the ability of equalization；The form of the composition of C phases is consistent with A in topology, passes through auxiliary capacitorC 5、C 6、C 7、C 8Effect, the constraints of C, B capacitive coupling voltage is similar with A, B capacitive coupling voltage constraints, and topology has son
Module capacitance voltage is from the ability of equalization.
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