CN106452147A - Three-phase symmetric topology for self-balance of capacitor voltage of MMC (Modular Multilevel Converter) module - Google Patents
Three-phase symmetric topology for self-balance of capacitor voltage of MMC (Modular Multilevel Converter) module Download PDFInfo
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- CN106452147A CN106452147A CN201611039450.7A CN201611039450A CN106452147A CN 106452147 A CN106452147 A CN 106452147A CN 201611039450 A CN201611039450 A CN 201611039450A CN 106452147 A CN106452147 A CN 106452147A
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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
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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
- H02M7/4835—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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Abstract
The invention discloses a three-phase symmetric topology for self-balance of capacitor voltage of an MMC (Modular Multilevel Converter) module. A half-bridge type MMC topology comprises inner-phase module capacitor self-circuits and inter-phase subsidiary loops. An inter-phase self-voltage-sharing circuit consists of 6(N-1) clamping diodes; and in switching of modules, unbalanced voltage of capacitors of the modules automatically flows from an i<th> module to an (i-1)<th> module, wherein the value of i is 2-(N-1). Each of the inter-phase subsidiary loops consists of six subsidiary capacitors, six subsidiary IGBTs (Insulated Gate Bipolar Translator) and nine subsidiary diodes, and a first module of a per-phase upper bridge arm and a last module of a per-phase lower bridge arm form two triangles by the inter-phase subsidiary loops, thereby realizing free flow of inter-phase energy. According to the topology disclosed by the invention, the self-balance of the inner-phase and inter-phase energy is realized; all the modules adopt identical sub-modules, thereby keeping consistency of the modules; and the inter-phase subsidiary loops at the two ends form the triangles, thereby keeping the symmetry of the three-phase topology.
Description
Technical field：
The invention belongs to Technology of HVDC based Voltage Source Converter field is and in particular to a kind of MMC module capacitance voltage of three-phase symmetrical
From equilibrium topology.
Background technology：
Modularization multi-level converter (Modular Multilevel Converter, MMC) is flexible DC power transmission skill
The basic topology of art converter valve, which solves when high-voltage great-current is applied, and traditional two level converter breaker in middle devices are direct
Series-parallel problem.In terms of loss, the sine wave modulation mode approached using staircase waveform, greatly reduce its switching frequency,
Compare with the high frequency modulated of traditional two level converters, loss is greatly reduced.After multiple submodule cascade, the staircase waveform of output is non-
Often approach sine wave, waveform quality is high, reduces the requirement of wave filter.Additionally, using after Redundancy Design, fault submodule can be by
Redundancy submodule replaces, and enhances reliability.
Submodule capacitor voltage equalizes and is to ensure that MMC inverter outputting high quality waveform, the key of converter valve reliability service,
In traditional MMC topology, asked using the equilibrium solving submodule capacitor voltage based on capacitance voltage sorting sub-module Switching Strategy
Inscribe, its basic idea is：The voltage of all submodules of acquisition system, according to converter bridge arm sense of current, module charges
When, all modules on brachium pontis press boosting sequence, the relatively low module of preferential input voltage；During module discharge, module is pressed blood pressure lowering and is arranged
Sequence, the higher module preferential discharge of voltage, apply this Switching Strategy, when sequence frequency is higher, can be good at ensureing submodule
The concordance of block capacitance voltage.But it is as the lifting of transmission line capability and electric pressure, number of modules is significantly increased, on each brachium pontis
Number of modules up to hundreds of, cannot quickly all module voltage be collected in a processor, thus being unfavorable for arranging
The carrying out of sequence, and the required sequence number of times that sorts is also a lot, at this moment will carry out packet sequencing with multiple processors, and packet is thrown
Cut, in this way, the concordance of module capacitance voltage will reduce.
Document " A DC-Link Voltage Self-Balance Method for a Diode-Clamped
Propose in Modular Multilevel Converter With Minimum Number of Voltage Sensors "
A kind of method realizing oneself pressure of MMC module capacitance using auxiliary clamp diode and transformator, submodule balancing energy limits to
In phase, and the introducing of transformator makes system structure and control strategy complex.
It is based on the last period carried literary composition in patent " the centralized half-bridge MMC of the auxiliary capacitor based on equality constraint is topological from all pressing "
Booster diode isostatic pressing in offering is it is proposed that a kind of alternate balancing energy topology based on auxiliary capacitor and modulation strategy.Its
Basic thought has been the booster diode being connected using submodule electric capacity, and in the biphase phase of A, C, imbalance flows up automatically,
Brachium pontis the top A, C two utilizes the uppermost module discharge of auxiliary capacitor phase B phase after being in parallel；B phase is then contrary, and imbalance is through energy
Amount booster diode flows downward, and flow to auxiliary capacitor, to A, C two phase discharge.Its topology can be realized in phase substantially, alternate mould
Block energy equalizes, but itself is asymmetric for topology, destroys the symmetry of three-phase system, final A, C phase enable full symmetric,
Differ larger with B phase.Additionally, the submodule of B phase and the biphase use of A, C is different in its topology, it is unfavorable for modularized production.
Content of the invention：
The invention aims to overcoming " the centralized half-bridge MMC of the auxiliary capacitor based on equality constraint is topological from all pressing "
The problem of middle asymmetrical three-phase, there is provided a kind of MMC module capacitance voltage of three-phase symmetrical is from topology in a balanced way, this topology energy
Realize phase inner module capacitance voltage from all pressing, alternate imbalance energy circulation circulates, and topological structure is full symmetric.
For reaching above-mentioned purpose, the present invention is achieved through the following technical solutions：
A kind of MMC module capacitance voltage of three-phase symmetrical is certainly topological in a balanced way, including in three-phase semi-bridge type MMC model, phase
Clamp diode is from equalizer circuit and alternate imbalance energy flux loop；Three-phase semi-bridge type MMC model is used for realizing alternating current-direct current
Conversion, in the phase being connected with three-phase semi-bridge type MMC model Neutron module, clamp diode forces submodule voltage from equalizer circuit
Automatic equalization, alternate uneven energy in three-phase semi-bridge type MMC model is by alternate imbalance energy flux loop stream simultaneously
Logical.
The present invention is further improved by, and three-phase semi-bridge type MMC model, by A, B, C tri- phase composition, often mutually has upper and lower two
Individual brachium pontis is constituted, and each brachium pontis has N number of semi-bridge type submodule, on each brachium pontis, submodule block number is followed successively by 1-N from top to bottom；
1st submodule of brachium pontis, its submodule electric capacity C wherein in A phaseAu_1Negative pole the 2nd submodule with brachium pontis in A phase downwards
IGBT module midpoint is connected, and its submodule IGBT module midpoint is connected with dc bus positive pole upwards, the of brachium pontis in A phase
The value of i submodule, wherein i is 2～N-1, its submodule electric capacity CAu_iNegative pole individual with the i+1 of brachium pontis in A phase downwards
Submodule IGBT module midpoint is connected, its submodule IGBT module midpoint the i-th -1 submodule electricity with brachium pontis in A phase upwards
Hold CAu_i-1Negative pole is connected, the n-th submodule of brachium pontis in A phase, its submodule electric capacity CAu_nNegative pole down through two brachium pontis
Reactor LAuAnd LAdModule I GBT module midpoint sub- with the 1st of brachium pontis under A phase is connected, its submodule IGBT module midpoint
N-1 sub- module capacitance C with brachium pontis in A phase upwardsAu_n-1Negative pole be connected, i-th submodule of brachium pontis under A phase, its
Submodule electric capacity CAd_iNegative pole downwards sub- module I GBT module midpoint individual with the i+1 of brachium pontis under A phase is connected, its IGBT mould
Block midpoint the i-th -1 sub- module capacitance C with brachium pontis under A phase upwardsAd_i-1Negative pole be connected, brachium pontis n-th submodule under A phase
Block electric capacity CAd_nNegative pole be directly connected to direct current negative busbar, its IGBT module midpoint upwards with the N-1 submodule of brachium pontis under A phase
Electric capacity CAd_n-1Negative pole be connected；1st submodule of brachium pontis, its submodule electric capacity C in B phaseBu_1Negative pole downwards with B phase on
2nd sub- module I GBT module midpoint of brachium pontis is connected, its submodule IGBT module midpoint upwards with dc bus positive pole phase
Connect, i-th submodule of brachium pontis in B phase, the wherein value of i are 2～N-1, its submodule electric capacity CBu_iNegative pole downwards and B
In phase, the i+1 sub- module I GBT module midpoint of brachium pontis is connected, its submodule IGBT module midpoint upwards with brachium pontis in B phase
The i-th -1 sub- module capacitance CBu_i-1Negative pole is connected, the n-th submodule of brachium pontis in B phase, its submodule electric capacity CBu_n's
Negative pole is down through two brachium pontis reactor LBuAnd LBdModule I GBT module midpoint sub- with the 1st of brachium pontis under B phase is connected, its
Submodule IGBT module midpoint N-1 sub- module capacitance C with brachium pontis in B phase upwardsBu_n-1Negative pole be connected, bridge under B phase
I-th submodule of arm, its submodule electric capacity CBd_iThe negative pole individual sub- module I GBT module with the i+1 of brachium pontis under B phase downwards
Midpoint is connected, its IGBT module midpoint the i-th -1 sub- module capacitance C with brachium pontis under B phase upwardsBd_i-1Negative pole be connected,
Brachium pontis n-th submodule electric capacity C under B phaseBd_nNegative pole be directly connected to direct current negative busbar, its IGBT module midpoint upwards with B phase
Lower brachium pontis N-1 sub- module capacitance CBd_n-1Negative pole be connected；1st submodule of brachium pontis, its submodule electric capacity in C phase
CCu_1Negative pole downwards module I GBT module midpoint sub- with the 2nd of brachium pontis in C phase is connected, its submodule IGBT module midpoint
It is connected with dc bus positive pole upwards, i-th submodule of brachium pontis in C phase, the wherein value of i are 2～N-1, its submodule
Electric capacity CCu_iNegative pole downwards sub- module I GBT module midpoint individual with the i+1 of brachium pontis in C phase is connected, its submodule IGBT mould
Block midpoint the i-th -1 sub- module capacitance C with brachium pontis in C phase upwardsCu_i-1Negative pole is connected, the n-th submodule of brachium pontis in C phase
Block, its submodule electric capacity CCu_nNegative pole down through two brachium pontis reactor LCuAnd LCdThe 1st submodule with brachium pontis under C phase
IGBT module midpoint is connected, its submodule IGBT module midpoint N-1 sub- module capacitance with brachium pontis in C phase upwards
CCu_n-1Negative pole be connected, i-th submodule of brachium pontis under C phase, its submodule electric capacity CCd_iNegative pole downwards with bridge under C phase
The sub- module I GBT module midpoint of i+1 of arm is connected, its IGBT module midpoint the i-th -1 son with brachium pontis under C phase upwards
Module capacitance CCd_i-1Negative pole be connected, brachium pontis n-th submodule electric capacity C under C phaseCd_nNegative pole be directly connected to direct current bear mother
Line, its IGBT module midpoint individual sub- module capacitance C with brachium pontis N-1 under C phase upwardsCd_n-1Negative pole be connected；Constitute above-mentioned constraint
A, B, C three-phase topology of relation is completely the same.
The present invention is further improved by, in phase clamp diode from equalizer circuit by being connected to three-phase semi-bridge type MMC
The clamp diode composition of model Neutron module capacitance cathode, brachium pontis n-th submodule electric capacity C in A phaseAu_nPositive pole through clamp
Diode is connected to the N-1 module capacitance CAu_n-1Positive pole, by that analogy, the 2nd sub- module capacitance C of brachium pontis in A phaseAu_2Just
Pole is connected to the 1st sub- module capacitance CAu_1Positive pole, the 1st sub- module capacitance CAu_1Positive pole be connected to alternate auxiliary through diode
Electric capacity C1Positive pole；Brachium pontis n-th submodule electric capacity C under A phaseAd_nPositive pole is connected to N-1 sub- module capacitance through clamp diode
CAd_n-1Positive pole, by that analogy, lower the 2nd sub- module capacitance C of brachium pontisAd_2Positive pole be connected to first son through clamp diode
Module capacitance CAd_1Positive pole, lower first sub- module capacitance C of brachium pontisAd_1Positive pole be connected in A phase brachium pontis through clamp diode
A submodule C afterwardsAu_nPositive pole；Brachium pontis n-th submodule electric capacity C in B phaseBu_nPositive pole be connected to N-1 through clamp diode
Individual module capacitance CBu_n-1Positive pole, by that analogy, the 2nd sub- module capacitance C of brachium pontis in B phaseBu_2Positive pole is connected to the 1st submodule
Block electric capacity CBu_1Positive pole, the 1st sub- module capacitance CBu_1Positive pole be connected to alternate auxiliary capacitor C through diode2Positive pole；B phase
Lower brachium pontis n-th submodule electric capacity CBd_nPositive pole is connected to N-1 sub- module capacitance C through clamp diodeBd_n-1Positive pole, with
This analogizes, lower the 2nd sub- module capacitance C of brachium pontisBd_2Positive pole be connected to first sub- module capacitance C through clamp diodeBd_1Just
Pole, lower first sub- module capacitance C of brachium pontisBd_1Positive pole be connected to last submodule of brachium pontis C in B phase through clamp diodeBu_n
Positive pole；Brachium pontis n-th submodule electric capacity C in C phaseCu_nPositive pole be connected to the N-1 module capacitance C through clamp diodeCu_n-1
Positive pole, by that analogy, the 2nd sub- module capacitance C of brachium pontis in C phaseCu_2Positive pole is connected to the 1st sub- module capacitance CCu_1Positive pole,
1st sub- module capacitance CCu_1Positive pole be connected to alternate auxiliary capacitor C through diode3Positive pole；Brachium pontis n-th submodule under C phase
Electric capacity CCd_nPositive pole is connected to N-1 sub- module capacitance C through clamp diodeCd_n-1Positive pole, by that analogy, lower brachium pontis the 2nd
Submodule electric capacity CCd_2Positive pole be connected to first sub- module capacitance C through clamp diodeCd_1Positive pole, lower first son of brachium pontis
Module capacitance CCd_1Positive pole be connected to last submodule of brachium pontis C in C phase through clamp diodeCu_nPositive pole；This three-phase is complete
In consistent phase clamp diode from equalizer circuit within interest field.
The present invention is further improved by, and alternate imbalance energy flux loop is arranged in brachium pontis first in every phase
Between individual submodule and under every phase between brachium pontis n-th submodule, loop between two neighboring module by two diodes, one
Individual auxiliary charging electric capacity and an IGBT composition；First sub- module capacitance C of brachium pontis in A phaseAu_1Positive pole through diode connect
Auxiliary capacitor C1Positive pole, electric capacity C1Negative pole be connected in direct current positive bus through diode, additionally, auxiliary capacitor C1Positive pole warp
Auxiliary IGBT T1It is connected to the 1st module capacitance C of brachium pontis in B phaseBu_1Positive pole, electric capacity CBu_1Negative pole be connected to through diode
Brachium pontis auxiliary capacitor C in A phase1Negative pole, constitute alternate loop, by that analogy, brachium pontis auxiliary capacitor C in B phase2Positive pole through auxiliary
Help IGBT T2It is connected to the 1st module capacitance C of brachium pontis in C phaseCu_1Positive pole, CCu_1Negative pole be connected in B phase brachium pontis auxiliary
Electric capacity C2Negative pole, likewise, brachium pontis auxiliary capacitor C in C phase3It is connected to first sub- module capacitance C of brachium pontis in A phaseAu_1On,
First module composition triangle loop of brachium pontis on three-phase；Similar with upper brachium pontis, for the alternate subsidiary loop of lower brachium pontis, A phase
Lower brachium pontis n-th module capacitance CAd_nPositive pole be connected to lower brachium pontis auxiliary capacitor C through booster diode4Positive pole, auxiliary capacitor C4
Negative pole be directly connected in direct current negative busbar, C4Positive pole through assist IGBT T4It is connected to last submodule of brachium pontis under B phase
Block electric capacity CBd_nPositive pole, auxiliary capacitor C4With B phase last submodule electric capacity CBd_nNegative pole pass through direct current negative busbar be connected
Connect, likewise, last submodule of brachium pontis electric capacity C under B phaseBd_nPositive pole through diode connect auxiliary capacitor C5Positive pole, auxiliary
Electric capacity C5Negative pole meet direct current negative busbar, auxiliary capacitor C5Positive pole through assist IGBT T5It is connected to last height of brachium pontis under C phase
Module capacitance CCd_nPositive pole, CCd_nNegative pole through direct current negative busbar constitute loop, last submodule electric capacity of brachium pontis under C phase
CCd_nPositive pole through diode connect auxiliary capacitor C6Positive pole, auxiliary capacitor C6Negative pole meet direct current negative busbar, auxiliary capacitor C6's
Positive pole is through assisting IGBT T6It is connected to last submodule of brachium pontis electric capacity C under A phaseAd_nPositive pole, CAd_nNegative pole through direct current bear
Bus constitutes loop；So, under three-phase, last submodule of brachium pontis also passes through the triangle loop of alternate auxiliary circuit,
Realize three-phase full symmetric.
Compared with prior art, the present invention has the advantage that：
The present invention entirely submodule used by topology identical it is ensured that the MMC original symmetry of topology, clamp two in phase
Pole pipe is capable of in MMC every phase Neutron module voltage automatic equalization from equalizer circuit, and the uneven energy between three-phase passes through
Balance is realized in alternate imbalance energy flux loop, and by MMC, in phase, clamp diode is from equalizer circuit, alternate imbalance energy
Amount flow cycle three Partial coordination work, makes whole system energy automatic equalization.
Further, realize submodule capacitor voltage in MMC phase in phase and, from equalizing, eliminate the sensing of capacitance voltage sampling
Device it is assumed that there being N number of module on each brachium pontis, then can save 6N voltage measurement sensor, and the light that communicates accordingly；This
Outward, MMC module voltage automatic equalization, controller is not needing sort operation, reduces the requirement to controller, especially high pressure
In Large Copacity current conversion station, submodule number is more, and this advantage is more notable.
Additionally, alternate imbalance energy flux loop is disposed adjacent to the two ends of direct current positive and negative busbar, alternate imbalance
The loop circulation by two ends for the energy, realizes balance, in final three-phase, the voltage of corresponding submodule also can be equal, improves module
Capacitor voltage equalizing performance.
In sum, in the full symmetric phase of three-phase, submodule electric capacity, can not only from equilibrium, alternate energy self-balancing topology
It is applied to flexible direct-current transmission field it is also possible to constitute STATCOM (STATCOM), Research on Unified Power Quality Conditioner
(UPQC), the FACTS device of other high-voltage large-capacities such as THE UPFC (UPFC).This invention topology of indirect utilization and think of
The other application occasion thought is also within interest field.
Brief description：
Fig. 1 is that the MMC module capacitance voltage of three-phase symmetrical equalizes topology certainly；
Fig. 2 is the schematic diagram of semi-bridge type submodule；
Fig. 3 is phase inner module capacitance voltage from balanced energy circulation schematic diagram；
Fig. 4 is alternate imbalance energy flux schematic diagram；
Fig. 5 is brachium pontis submodule capacitor voltage stable state waveform in A phase；
Fig. 6 is brachium pontis submodule capacitor voltage stable state waveform under A phase；
Fig. 7 is the sub- module voltage stable state waveform of brachium pontis first in every phase；
Fig. 8 is last submodule voltage stable state waveform of brachium pontis under every phase；
Fig. 9 is the 4th sub- module voltage stable state waveform of brachium pontis in every phase.
Specific embodiment：
With reference to specific embodiment, the topology of the present invention and operation principle are described in further detail, described are
Explanation of the invention rather than restriction.
1) with reference to Fig. 1, half-bridge submodule is made up of two IGBT and module capacitance；With reference to Fig. 2, three-phase symmetrical
, from equalizing topology, including the half-bridge MMC model being made up of A, B, C three-phase, A, B, C three-phase is respectively by 2N for MMC module capacitance voltage
Individual half-bridge submodule, 2 brachium pontis reactors are in series；Including the individual clamp diode of 6 (N-1), 9 alternate booster diodes, 6
Individual auxiliary capacitor, all presses alternate imbalance energy flux loop certainly in the phase of 6 auxiliary IGBT module compositions.
2) in semi-bridge type MMC topology, the 1st submodule of brachium pontis in A phase, its submodule electric capacity negative pole downwards with A phase on
2nd sub- module I GBT module midpoint of brachium pontis is connected, its submodule IGBT module midpoint upwards with dc bus positive pole phase
Connect；I-th submodule of brachium pontis in A phase, the wherein value of i are 2～N-1, its submodule electric capacity negative pole downwards with bridge in A phase
The sub- module I GBT module midpoint of the i+1 of arm is connected, its submodule IGBT module midpoint upwards with i-th of brachium pontis in A phase-
1 sub- module capacitance negative pole is connected；The n-th submodule of brachium pontis in A phase, its submodule electric capacity CAuNNegative pole down through two
Individual brachium pontis reactor module I GBT module midpoint sub- with the 1st of brachium pontis under A phase is connected, its submodule IGBT module midpoint to
The upper N-1 with brachium pontis in A phase sub- module capacitance negative pole is connected；I-th submodule of brachium pontis, the wherein value of i under A phase
For 2～N-1, sub- module I GBT module midpoint individual with the i+1 of brachium pontis under A phase is connected its submodule electric capacity negative pole downwards, its
Module capacitance negative pole with the i-th -1 of brachium pontis under A phase is connected upwards at IGBT module midpoint.The biphase connected mode of B, C and A
Mutually completely the same.
3) in phase from all pressure auxiliary circuits, last submodule of brachium pontis (n-th) electric capacity C in A phaseAuNPositive pole
It is connected to the negative pole of N-1 module capacitance through booster diode, by that analogy, the 2nd sub- module capacitance C of brachium pontis in A phaseAu2's
Positive pole is connected to the 1st sub- module capacitance CAu1Negative pole, the 1st sub- module capacitance CAu1Positive pole connect diode and be connected to alternate auxiliary
Electric capacity C1Positive pole；Similar, brachium pontis n-th submodule electric capacity C under A phaseAdNPositive pole be connected to N-1 through clamp diode
Submodule electric capacity CAd(N-1)Negative pole, by that analogy, lower the 2nd sub- module capacitance C of brachium pontisAd2Positive pole connect through clamp diode
To first sub- module capacitance CAd1Negative pole, lower first sub- module capacitance positive pole of brachium pontis be not added with clamp diode.B, C are biphase
The connected mode mode that is connected with A completely the same.
4) in alternate imbalance energy flux loop, first sub- module capacitance C of brachium pontis in A phaseAu1Positive pole through two poles
Pipe connects auxiliary capacitor C1Positive pole, electric capacity negative pole is connected in direct current positive bus through diode, additionally, auxiliary capacitor C1Just
Pole is through assisting IGBT T1It is connected to the 1st module capacitance C of brachium pontis in B phaseBu1Positive pole, its negative pole through flow back diode D1Connect
To A phase upper end auxiliary capacitor C1Negative pole, constitute alternate loop.By that analogy, B phase auxiliary capacitor C2Positive pole through assist IGBT
T2It is connected to the 1st module capacitance C of brachium pontis in C phaseCu1Positive pole, its negative pole is through diode D2It is connected to B phase upper end auxiliary capacitor
C2Negative pole, likewise, C phase auxiliary capacitor is connected to A phase, on three-phase, first module capacitance of brachium pontis is through alternate auxiliary circuit structure
Triangularity loop.Similar with upper brachium pontis, for the alternate subsidiary loop of lower brachium pontis, last module capacitance of brachium pontis under A phase
CAdNPositive pole through booster diode D4It is connected to lower brachium pontis auxiliary capacitor C4Positive pole, auxiliary capacitor C4Negative pole is directly connected to direct current
In negative busbar, the positive pole of auxiliary capacitor is through assisting IGBT T4It is connected to last submodule of brachium pontis electric capacity C under B phaseBdNJust
Pole, auxiliary capacitor C4With B phase last submodule electric capacity CBdNNegative pole be connected by direct current negative busbar.Likewise, B phase
Lower brachium pontis last submodule electric capacity CBdNPositive pole through diode connect auxiliary capacitor C5Positive pole, auxiliary capacitor negative pole connects
Direct current negative busbar, auxiliary capacitor C5Positive pole through assist IGBT T5It is connected to last submodule of brachium pontis electric capacity C under C phaseCdNJust
Pole, negative pole constitutes loop through direct current negative busbar.C phase is connected to A phase with same method.So, under three-phase brachium pontis last
Submodule also passes through the triangle loop of alternate auxiliary circuit, realizes three-phase full symmetric.
With reference to Fig. 3, phase is interior from equalizer circuit in the course of the work, when the down tube conducting of n-th module on a certain brachium pontis,
If n-th module capacitance voltage is higher than the capacitance voltage of N-1 module, with reference to Fig. 3, the positive pole warp of n-th module capacitance
Clamp diode is connected to the positive pole of N-1 module capacitance, and now the down tube of n-th module is conducting, i.e. N and N-1
The negative pole of individual module capacitance is connected, and n-th module charges automatically to the N-1 module, the module electricity so on each brachium pontis
Hold voltage to can be achieved with certainly equalizing.
With reference to Fig. 4, the upper pipe of the half-bridge module that the drive signal of auxiliary IGBT is all connected with it in alternate equilibrium loop
Drive signal be consistent；The charging modes of alternate auxiliary capacitor are consistent with phase inner module charging modes, with brachium pontis in A phase are
Example, when first submodule down tube conducting on upper brachium pontis, its module capacitance positive pole is connected with auxiliary capacitor positive pole through diode,
Auxiliary capacitor negative pole is connected with the negative pole of first module capacitance with the down tube of first module through direct current positive bus, constitutes and charges
Loop；When first module down tube of A phase turns off, when upper pipe is opened, alternate auxiliary IGBT T1Conducting, if auxiliary capacitor voltage
Higher than the capacitance voltage of first module of B phase, auxiliary capacitor first module of brachium pontis from trend B phase charges, and remaining is alternate auxiliary
Help the working method in loop all with A, the alternate loop of the upper brachium pontis of B is consistent.Realize the mutual transmission of alternate imbalance energy, finally reach
To the alternate energy balance.
Specifically known perfectly well by above-mentioned, carried topology enables phase inner module capacitance voltage from equilibrium, alternate imbalance energy
Free flow, finally makes in phase, alternate energy is all realized equalizing, and topology keeps three-phase full symmetric.
Embodiment：
According to description of the invention, apply in examples of simulation the capacitance voltage of three-phase symmetrical from equalizing topology as shown in figure 1,
It exchanges side joint 380V AC network rated voltage, and DC side rated voltage is 700V, connects 96 Ω ohmic loads；Using 5 level
Structure, that is, often phase upper and lower bridge arm has 4 sub- half-bridge modules to constitute, and submodule electric capacity is 3300 μ F, the specified electricity of submodule electric capacity
Press as 175V；Brachium pontis reactor is 15mH；After system stable operation, in phase, clamp diode is from during the work of equalizer circuit, sub
Mutually clamp between module capacitance, voltage maintains equilibrium, with reference to Fig. 5 and Fig. 6, taking A phase as a example, four submodules of brachium pontis in A phase
Capacitance voltage UcAui, four module capacitance voltages of brachium pontis under i=1-4 and A phaseUcAdi, can equalize, and deviation is within ± 5V,
Fluctuation is within 2.85%；With reference to Fig. 7, first sub- module voltage U of brachium pontis on A, B, C three-phasecAu1, UcBu1And UcCu1Amplitude and
Rule of conversion is almost completely the same, 120 ° of phase place mutual deviation, likewise, with reference to Fig. 8, last submodule voltage of brachium pontis under three-phase
UcAd4, UcBd4And UcCd4Amplitude and rule of conversion are also almost completely the same, 120 ° of phase place mutual deviation, thus can obtain the electricity of three-phase symmetrical
Hold voltage can voltage can mutually equalize between every first submodule of phase from equilibrium topology, voltage between last submodule
Also can mutually equalize, reach the purpose of alternate imbalance energy free flow.After the submodule balance of voltage at every phase two ends, by phase
Interior clamp diode forces the submodule voltage on every opposite position also to equalize from equalizer circuit, with reference to Fig. 9, such as A, B, C tri-
Upper the 4th sub- module voltage U of brachium pontis in phasecAu4, UcBu4And UcCu4Can realize equalizing, therefore in phase, clamp diode is all pressed certainly
Circuit and the collective effect in alternate imbalance energy flux loop, make the submodule electric voltage equalization in MMC topology, often mutually it
Between also enable balancing energy.
Claims (4)
1. a kind of MMC module capacitance voltage of three-phase symmetrical is from topology in a balanced way it is characterised in that including three-phase semi-bridge type MMC
In model, phase, clamp diode is from equalizer circuit and alternate imbalance energy flux loop；Three-phase semi-bridge type MMC model is used for real
Existing AC-DC conversion, in the phase being connected with three-phase semi-bridge type MMC model Neutron module, clamp diode forces son from equalizer circuit
Module voltage automatic equalization, alternate uneven energy in three-phase semi-bridge type MMC model is by alternate imbalance energy stream simultaneously
The circulation of logical loop.
2. from topology in a balanced way, its feature exists a kind of MMC module capacitance voltage of three-phase symmetrical according to claim 1
In three-phase semi-bridge type MMC model, by A, B, C tri- phase composition, often mutually has upper and lower two brachium pontis to constitute, each brachium pontis has N number of half
Bridge type submodule, on each brachium pontis, submodule block number is followed successively by 1-N from top to bottom；1st submodule of brachium pontis wherein in A phase,
Its submodule electric capacity CAu_1Negative pole downwards module I GBT module midpoint sub- with the 2nd of brachium pontis in A phase is connected, its submodule
IGBT module midpoint is connected with dc bus positive pole upwards, i-th submodule of brachium pontis in A phase, the wherein value of i be 2～
N-1, its submodule electric capacity CAu_iNegative pole downwards sub- module I GBT module midpoint individual with the i+1 of brachium pontis in A phase is connected, its
Submodule IGBT module midpoint the i-th -1 sub- module capacitance C with brachium pontis in A phase upwardsAu_i-1Negative pole is connected, brachium pontis in A phase
N-th submodule, its submodule electric capacity CAu_nNegative pole down through two brachium pontis reactor LAuAnd LAdWith brachium pontis under A phase
1 sub- module I GBT module midpoint is connected, its submodule IGBT module midpoint the N-1 submodule with brachium pontis in A phase upwards
Block electric capacity CAu_n-1Negative pole be connected, i-th submodule of brachium pontis under A phase, its submodule electric capacity CAd_iNegative pole downwards and A
Under phase, the i+1 sub- module I GBT module midpoint of brachium pontis is connected, its IGBT module midpoint upwards with i-th of brachium pontis under A phase-
1 sub- module capacitance CAd_i-1Negative pole be connected, brachium pontis n-th submodule electric capacity C under A phaseAd_nNegative pole be directly connected to direct current
Negative busbar, its IGBT module midpoint individual sub- module capacitance C with brachium pontis N-1 under A phase upwardsAd_n-1Negative pole be connected；Bridge in B phase
1st submodule of arm, its submodule electric capacity CBu_1Negative pole downwards with the 2nd sub- module I GBT module of brachium pontis in B phase in
Point is connected, and its submodule IGBT module midpoint is connected with dc bus positive pole upwards, i-th submodule of brachium pontis in B phase,
Wherein the value of i is 2～N-1, its submodule electric capacity CBu_iNegative pole individual sub- module I GBT with the i+1 of brachium pontis in B phase downwards
Module midpoint is connected, its submodule IGBT module midpoint the i-th -1 sub- module capacitance C with brachium pontis in B phase upwardsBu_i-1Negative
Pole is connected, the n-th submodule of brachium pontis in B phase, its submodule electric capacity CBu_nNegative pole down through two brachium pontis reactor LBu
And LBdModule I GBT module midpoint sub- with the 1st of brachium pontis under B phase is connected, its submodule IGBT module midpoint upwards with B phase
N-1 sub- module capacitance C of upper brachium pontisBu_n-1Negative pole be connected, i-th submodule of brachium pontis under B phase, its submodule electricity
Hold CBd_iNegative pole downwards sub- module I GBT module midpoint individual with the i+1 of brachium pontis under B phase is connected, its IGBT module midpoint to
Upper the i-th -1 sub- module capacitance C with brachium pontis under B phaseBd_i-1Negative pole be connected, brachium pontis n-th submodule electric capacity under B phase
CBd_nNegative pole be directly connected to direct current negative busbar, its IGBT module midpoint upwards with the sub- module capacitance of brachium pontis N-1 under B phase
CBd_n-1Negative pole be connected；1st submodule of brachium pontis, its submodule electric capacity C in C phaseCu_1Negative pole downwards with brachium pontis in C phase
The 2nd sub- module I GBT module midpoint be connected, its submodule IGBT module midpoint is connected with dc bus positive pole upwards,
I-th submodule of brachium pontis in C phase, the wherein value of i are 2～N-1, its submodule electric capacity CCu_iNegative pole downwards with C phase on
The sub- module I GBT module midpoint of the i+1 of brachium pontis is connected, its submodule IGBT module midpoint upwards with brachium pontis in C phase the
I-1 sub- module capacitance CCu_i-1Negative pole is connected, the n-th submodule of brachium pontis in C phase, its submodule electric capacity CCu_nNegative pole
Down through two brachium pontis reactor LCuAnd LCdModule I GBT module midpoint sub- with the 1st of brachium pontis under C phase is connected, its submodule
Block IGBT module midpoint N-1 sub- module capacitance C with brachium pontis in C phase upwardsCu_n-1Negative pole be connected, brachium pontis under C phase
I-th submodule, its submodule electric capacity CCd_iThe negative pole individual sub- module I GBT module midpoint with the i+1 of brachium pontis under C phase downwards
It is connected, its IGBT module midpoint the i-th -1 sub- module capacitance C with brachium pontis under C phase upwardsCd_i-1Negative pole be connected, C phase
Lower brachium pontis n-th submodule electric capacity CCd_nNegative pole be directly connected to direct current negative busbar, its IGBT module midpoint upwards with bridge under C phase
Arm N-1 sub- module capacitance CCd_n-1Negative pole be connected；A, B, C three-phase topology constituting above-mentioned restriction relation is completely the same.
3. from topology in a balanced way, its feature exists a kind of MMC module capacitance voltage of three-phase symmetrical according to claim 2
In, in phase clamp diode from equalizer circuit by the clamp two being connected to three-phase semi-bridge type MMC model Neutron module capacitance cathode
Pole pipe forms, brachium pontis n-th submodule electric capacity C in A phaseAu_nPositive pole be connected to the N-1 module capacitance through clamp diode
CAu_n-1Positive pole, by that analogy, the 2nd sub- module capacitance C of brachium pontis in A phaseAu_2Positive pole is connected to the 1st sub- module capacitance CAu_1's
Positive pole, the 1st sub- module capacitance CAu_1Positive pole be connected to alternate auxiliary capacitor C through diode1Positive pole；Brachium pontis n-th under A phase
Submodule electric capacity CAd_nPositive pole is connected to N-1 sub- module capacitance C through clamp diodeAd_n-1Positive pole, by that analogy, lower bridge
The 2nd sub- module capacitance C of armAd_2Positive pole be connected to first sub- module capacitance C through clamp diodeAd_1Positive pole, lower brachium pontis
One sub- module capacitance CAd_1Positive pole be connected to last submodule of brachium pontis C in A phase through clamp diodeAu_nPositive pole；B phase
Upper brachium pontis n-th submodule electric capacity CBu_nPositive pole be connected to the N-1 module capacitance C through clamp diodeBu_n-1Positive pole, with
This analogizes, the 2nd sub- module capacitance C of brachium pontis in B phaseBu_2Positive pole is connected to the 1st sub- module capacitance CBu_1Positive pole, the 1st submodule
Block electric capacity CBu_1Positive pole be connected to alternate auxiliary capacitor C through diode2Positive pole；Brachium pontis n-th submodule electric capacity C under B phaseBd_n
Positive pole is connected to N-1 sub- module capacitance C through clamp diodeBd_n-1Positive pole, by that analogy, lower the 2nd submodule electricity of brachium pontis
Hold CBd_2Positive pole be connected to first sub- module capacitance C through clamp diodeBd_1Positive pole, lower first sub- module capacitance of brachium pontis
CBd_1Positive pole be connected to last submodule of brachium pontis C in B phase through clamp diodeBu_nPositive pole；Brachium pontis n-th submodule in C phase
Block electric capacity CCu_nPositive pole be connected to the N-1 module capacitance C through clamp diodeCu_n-1Positive pole, by that analogy, brachium pontis in C phase
2nd sub- module capacitance CCu_2Positive pole is connected to the 1st sub- module capacitance CCu_1Positive pole, the 1st sub- module capacitance CCu_1Positive pole
It is connected to alternate auxiliary capacitor C through diode3Positive pole；Brachium pontis n-th submodule electric capacity C under C phaseCd_nPositive pole is through clamp diode
It is connected to N-1 sub- module capacitance CCd_n-1Positive pole, by that analogy, lower the 2nd sub- module capacitance C of brachium pontisCd_2Positive pole through pincers
Position diode is connected to first sub- module capacitance CCd_1Positive pole, lower first sub- module capacitance C of brachium pontisCd_1Positive pole through clamp
Diode is connected to last submodule of brachium pontis C in C phaseCu_nPositive pole；In the on all four phase of this three-phase clamp diode from
Equalizer circuit is within interest field.
4. from topology in a balanced way, its feature exists a kind of MMC module capacitance voltage of three-phase symmetrical according to claim 2
In, alternate imbalance energy flux loop be arranged in every phase between first submodule of brachium pontis and every phase under brachium pontis N
Between individual submodule, the loop between two neighboring module is by two diodes, an auxiliary charging electric capacity and an IGBT group
Become；First sub- module capacitance C of brachium pontis in A phaseAu_1Positive pole through diode connect auxiliary capacitor C1Positive pole, electric capacity C1Negative pole
It is connected in direct current positive bus through diode, additionally, auxiliary capacitor C1Positive pole through assist IGBT T1It is connected to brachium pontis in B phase
1 module capacitance CBu_1Positive pole, electric capacity CBu_1Negative pole be connected to brachium pontis auxiliary capacitor C in A phase through diode1Negative pole, structure
Become alternate loop, by that analogy, brachium pontis auxiliary capacitor C in B phase2Positive pole through assist IGBT T2It is connected to brachium pontis the 1st in C phase
Module capacitance CCu_1Positive pole, CCu_1Negative pole be connected to brachium pontis auxiliary capacitor C in B phase2Negative pole, likewise, brachium pontis in C phase
Auxiliary capacitor C3It is connected to first sub- module capacitance C of brachium pontis in A phaseAu_1On, first module composition triangle of brachium pontis on three-phase
Loop；Similar with upper brachium pontis, for the alternate subsidiary loop of lower brachium pontis, brachium pontis n-th module capacitance C under A phaseAd_nPositive pole warp
Booster diode is connected to lower brachium pontis auxiliary capacitor C4Positive pole, auxiliary capacitor C4Negative pole be directly connected in direct current negative busbar, C4
Positive pole through assist IGBT T4It is connected to last submodule of brachium pontis electric capacity C under B phaseBd_nPositive pole, auxiliary capacitor C4With B phase
Last submodule electric capacity CBd_nNegative pole be connected by direct current negative busbar, likewise, last submodule of brachium pontis under B phase
Block electric capacity CBd_nPositive pole through diode connect auxiliary capacitor C5Positive pole, auxiliary capacitor C5Negative pole connect direct current negative busbar, auxiliary electricity
Hold C5Positive pole through assist IGBT T5It is connected to last submodule of brachium pontis electric capacity C under C phaseCd_nPositive pole, CCd_nNegative pole warp
Direct current negative busbar constitutes loop, last submodule of brachium pontis electric capacity C under C phaseCd_nPositive pole through diode connect auxiliary capacitor C6
Positive pole, auxiliary capacitor C6Negative pole meet direct current negative busbar, auxiliary capacitor C6Positive pole through assist IGBT T6It is connected under A phase brachium pontis
Sub- module capacitance C afterwardsAd_nPositive pole, CAd_nNegative pole through direct current negative busbar constitute loop；So, under three-phase, brachium pontis is
A submodule also passes through the triangle loop of alternate auxiliary circuit afterwards, realizes three-phase full symmetric.
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| CN110649833A (en) * | 2019-09-03 | 2020-01-03 | 昆明理工大学 | MMC topological structure with interphase bidirectional self-voltage-sharing capability |
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Effective date of registration: 20210219 Address after: 518000 aotexin power building, No.3, songpingshan Road, North District, high tech Industrial Park, Nanshan District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN AUTO ELECTRIC POWER PLANT Co.,Ltd. Address before: Beilin District Xianning West Road 710049, Shaanxi city of Xi'an province No. 28 Patentee before: XI'AN JIAOTONG University |