CN106452147B - A kind of topology of oneself equilibrium of the MMC module capacitance voltage of three-phase symmetrical - Google Patents

A kind of topology of oneself equilibrium of the MMC module capacitance voltage of three-phase symmetrical Download PDF

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CN106452147B
CN106452147B CN201611039450.7A CN201611039450A CN106452147B CN 106452147 B CN106452147 B CN 106452147B CN 201611039450 A CN201611039450 A CN 201611039450A CN 106452147 B CN106452147 B CN 106452147B
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phase
bridge arm
module
anode
submodule
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CN106452147A (en
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王跃
尹太元
段国朝
王宁
尹诗媛
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SHENZHEN AUTO ELECTRIC POWER PLANT Co.,Ltd.
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Xian Jiaotong University
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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 a kind of topologys of oneself equilibrium of the MMC module capacitance voltage of three-phase symmetrical.Semi-bridge type MMC topology is made of phase internal module capacitor from circuit and alternate subsidiary loop.Alternate to be made of from equalizer circuit 6 (N-1) a clamp diodes, when module switching works, module capacitance unbalance voltage flows the value of wherein i from i-th of module to i-1 module automatically for 2~N-1.Alternate subsidiary loop is made of 6 auxiliary capacitors, IGBT and 9 booster diode of 6 auxiliary, and first module of bridge arm and every the last one module of phase lower bridge arm constitute two triangles through alternate subsidiary loop respectively in every phase, realize alternate energy free flow.The topology realizes in phase, the equilibrium certainly of alternate energy；All modules are all made of identical submodule, maintain the consistency of module；The alternate subsidiary loop at both ends constitutes triangle, keeps the symmetry of three-phase topology.

Description

A kind of topology of oneself equilibrium of the MMC module capacitance voltage of three-phase symmetrical
Technical field:
The invention belongs to flexible DC transmission technology fields, and in particular to a kind of MMC module capacitance voltage of three-phase symmetrical From balanced topology.
Background technique:
Modularization multi-level converter (Modular Multilevel Converter, MMC) is flexible DC transmission skill The basic topology of art converter valve, which solve in high-voltage great-current in application, switching device is direct in traditional two level converters Series-parallel problem.In terms of loss, the sine wave modulation mode approached using staircase waveform greatly reduces its switching frequency, It is compared with the high frequency modulated of traditional two level converters, loss is greatly reduced.The staircase waveform exported after multiple submodule cascade is non- Sine wave is often approached, waveform quality is high, reduces the requirement of filter.In addition, after using Redundancy Design, failure submodule can be by Redundancy submodule replaces, and enhances reliability.
Submodule capacitor voltage equilibrium is to guarantee MMC inverter outputting high quality waveform, the key of converter valve reliability service, In traditional MMC topology, asked using the equilibrium for solving submodule capacitor voltage based on capacitance voltage sorting sub-module switching strategy Topic, basic idea is: the voltage of all submodules of acquisition system, according to converter bridge arm sense of current, module charging When, all modules on bridge arm are preferential to put into the lower module of voltage by boosting sequence；When module discharge, module is by decompression row Sequence, the higher module preferential discharge of voltage when the frequency that sorts is higher, can be good at guaranteeing submodule using this switching strategy The consistency of block capacitance voltage.But with the promotion of transmission line capability and voltage class, number of modules is significantly increased, on each bridge arm Number of modules it is up to several hundred, all module voltages can not be collected in a processor quickly, to be unfavorable for arranging The progress of sequence, and the required sequence number that sorts is also very much, and sequence at this moment will be grouped with multiple processors, and grouping is thrown It cuts, in this way, the consistency of module capacitance voltage will reduce.
Document " A DC-Link Voltage Self-Balance Method for a Diode-Clamped It is proposed in Modular Multilevel Converter With Minimum Number of Voltage Sensors " A method of MMC module capacitance is realized using auxiliary clamp diode and transformer from pressing, and submodule balancing energy limits to In in phase, and the introducing of transformer keeps system structure and control strategy complex.
The last period mentioned text is based in patent " the auxiliary capacitor centralization half-bridge MMC based on equality constraint is topological from pressure " Booster diode isostatic pressing in offering proposes a kind of alternate balancing energy topology and modulation strategy based on auxiliary capacitor.Its Basic thought has been the booster diode connected using submodule capacitor, and imbalance flows up automatically in A, C two-phase phase, Bridge arm the top A, C two utilizes the uppermost module discharge of auxiliary capacitor phase B phase after being in parallel；B phase is then on the contrary, imbalance is through energy Amount booster diode flows downward, and auxiliary capacitor is flow to, to two phase discharge of A, C.Its topology can realize in phase substantially, alternate mould Block energy is balanced, but topology itself is asymmetric, destroys the symmetry of three-phase system, final A, C phase be able to achieve it is full symmetric, Differ larger with B phase.In addition, the submodule that B phase and A, C two-phase use in its topology is different, it is unfavorable for modularized production.
Summary of the invention:
The purpose of the invention is to overcome " the auxiliary capacitor centralization half-bridge MMC based on equality constraint is topological from pressure " The problem of middle asymmetrical three-phase, provides a kind of MMC module capacitance voltage of three-phase symmetrical from the topology of equilibrium, this topology energy Phase internal module capacitance voltage is realized from pressing, alternate imbalance energy circulation circulates, and topological structure is full symmetric.
In order to achieve the above objectives, the present invention is achieved through the following technical solutions:
A kind of topology of oneself equilibrium of the MMC module capacitance voltage of three-phase symmetrical, including in three-phase semi-bridge type MMC model, phase Clamp diode is from equalizer circuit and alternate uneven energy flux circuit；Three-phase semi-bridge type MMC model is for realizing alternating current-direct current It converts, clamp diode forces submodule voltage from equalizer circuit in the phase connecting with three-phase semi-bridge type MMC model Neutron module Automatic equalization, while uneven energy alternate in three-phase semi-bridge type MMC model passes through alternate uneven energy flux circuit stream It is logical.
A further improvement of the present invention lies in that three-phase semi-bridge type MMC model, by tri- phase composition of A, B, C, every phase has upper and lower two A bridge arm is constituted, and has N number of semi-bridge type submodule on each bridge arm, submodule block number is followed successively by 1-N from top to bottom on each bridge arm； Wherein in A phase bridge arm the 1st submodule, submodule capacitor CAu_1Cathode the 2nd submodule with bridge arm in A phase downwards IGBT module midpoint is connected, and submodule IGBT module midpoint is connected with DC bus anode upwards, the of bridge arm in A phase I submodule, wherein the value of i is 2~N-1, submodule capacitor CAu_iCathode downwards with the i+1 of bridge arm in A phase Submodule IGBT module midpoint is connected, submodule IGBT module midpoint (i-1)-th submodule electricity with bridge arm in A phase upwards Hold CAu_i-1Cathode is connected, the n-th submodule of bridge arm in A phase, submodule capacitor CAu_nCathode downwards through two bridge arms Reactor LAuAnd LAdIt is connected with the 1st sub- module I GBT module midpoint of A phase lower bridge arm, submodule IGBT module midpoint Upwards with the N-1 of bridge arm in A phase sub- module capacitance CAu_n-1Cathode be connected, i-th of submodule of A phase lower bridge arm, Submodule capacitor CAd_iCathode be connected with the i+1 of A phase lower bridge arm sub- module I GBT module midpoint downwards, IGBT mould Block midpoint upwards with (i-1)-th sub- module capacitance C of A phase lower bridge armAd_i-1Cathode be connected, A phase lower bridge arm n-th submodule Block capacitor CAd_nCathode be directly connected to direct current negative busbar, IGBT module midpoint upwards with A phase the N-1 submodule of lower bridge arm Capacitor CAd_n-1Cathode be connected；1st submodule of bridge arm, submodule capacitor C in B phaseBu_1Cathode downwards and in B phase The sub- module I GBT module midpoint of the 2nd of bridge arm is connected, submodule IGBT module midpoint upwards with DC bus anode phase It connects, i-th of submodule of bridge arm in B phase, wherein the value of i is 2~N-1, submodule capacitor CBu_iCathode downwards and B The i+1 sub- module I GBT module midpoint of bridge arm is connected in phase, submodule IGBT module midpoint upwards with bridge arm in B phase (i-1)-th sub- module capacitance CBu_i-1Cathode is connected, the n-th submodule of bridge arm in B phase, submodule capacitor CBu_n's Cathode is downwards through two bridge arm reactor LBuAnd LBdIt is connected with the 1st sub- module I GBT module midpoint of B phase lower bridge arm, Submodule IGBT module midpoint upwards with the N-1 of bridge arm in B phase sub- module capacitance CBu_n-1Cathode be connected, bridge under B phase I-th of submodule of arm, submodule capacitor CBd_iCathode downwards with the i+1 of B phase lower bridge arm sub- module I GBT module Midpoint is connected, IGBT module midpoint upwards with (i-1)-th sub- module capacitance C of B phase lower bridge armBd_i-1Cathode be connected, B phase lower bridge arm n-th submodule capacitor CBd_nCathode be directly connected to direct current negative busbar, IGBT module midpoint upwards with B phase N-1 sub- module capacitance C of lower bridge armBd_n-1Cathode be connected；1st submodule of bridge arm, submodule capacitor in C phase CCu_1Cathode be connected with the 2nd sub- module I GBT module midpoint of bridge arm in C phase downwards, submodule IGBT module midpoint It is connected upwards with DC bus anode, i-th of submodule of bridge arm in C phase, wherein the value of i is 2~N-1, submodule Capacitor CCu_iCathode be connected with the i+1 of bridge arm in C phase sub- module I GBT module midpoint downwards, submodule IGBT mould Block midpoint upwards with (i-1)-th sub- module capacitance C of bridge arm in C phaseCu_i-1Cathode is connected, the n-th submodule of bridge arm in C phase Block, submodule capacitor CCu_nCathode downwards through two bridge arm reactor LCuAnd LCdWith the 1st submodule of C phase lower bridge arm IGBT module midpoint is connected, submodule IGBT module midpoint upwards with the N-1 of bridge arm in C phase sub- module capacitances CCu_n-1Cathode be connected, i-th of submodule of C phase lower bridge arm, submodule capacitor CCd_iCathode downwards with bridge under C phase The sub- module I GBT module midpoint of the i+1 of arm is connected, IGBT module midpoint upwards with (i-1)-th son of C phase lower bridge arm Module capacitance CCd_i-1Cathode be connected, C phase lower bridge arm n-th submodule capacitor CCd_nCathode be directly connected to the negative mother of direct current Line, IGBT module midpoint upwards with C phase lower bridge arm N-1 sub- module capacitance CCd_n-1Cathode be connected；Constitute above-mentioned constraint A, B, C three-phase topology of relationship are completely the same.
A further improvement of the present invention lies in that clamp diode is from equalizer circuit by being connected to three-phase semi-bridge type MMC in phase The clamp diode of model Neutron module capacitance cathode forms, bridge arm n-th submodule capacitor C in A phaseAu_nAnode through clamping Diode is connected to the N-1 module capacitance CAu_n-1Anode, and so on, the 2nd sub- module capacitance C of bridge arm in A phaseAu_2Just Pole is connected to the 1st sub- module capacitance CAu_1Anode, the 1st sub- module capacitance CAu_1Anode through diode be connected to alternate auxiliary Capacitor C1Anode；A phase lower bridge arm n-th submodule capacitor CAd_nAnode is connected to N-1 sub- module capacitances through clamp diode CAd_n-1Anode, and so on, the 2nd sub- module capacitance C of lower bridge armAd_2Anode through clamp diode be connected to first son Module capacitance CAd_1Anode, lower bridge arm first sub- module capacitance CAd_1Anode be connected in A phase bridge arm most through clamp diode The latter submodule CAu_nAnode；Bridge arm n-th submodule capacitor C in B phaseBu_nAnode through clamp diode be connected to N-1 A module capacitance CBu_n-1Anode, and so on, the 2nd sub- module capacitance C of bridge arm in B phaseBu_2Anode is connected to the 1st submodule Block capacitor CBu_1Anode, the 1st sub- module capacitance CBu_1Anode through diode be connected to alternate auxiliary capacitor C2Anode；B phase Lower bridge arm n-th submodule capacitor CBd_nAnode is connected to N-1 sub- module capacitance C through clamp diodeBd_n-1Anode, with This analogizes, the 2nd sub- module capacitance C of lower bridge armBd_2Anode through clamp diode be connected to first sub- module capacitance CBd_1Just Pole, lower bridge arm first sub- module capacitance CBd_1Anode through clamp diode be connected to the last one submodule of bridge arm C in B phaseBu_n Anode；Bridge arm n-th submodule capacitor C in C phaseCu_nAnode through clamp diode be connected to the N-1 module capacitance CCu_n-1 Anode, and so on, the 2nd sub- module capacitance C of bridge arm in C phaseCu_2Anode is connected to the 1st sub- module capacitance CCu_1Anode, 1st sub- module capacitance CCu_1Anode through diode be connected to alternate auxiliary capacitor C3Anode；C phase lower bridge arm n-th submodule Capacitor CCd_nAnode is connected to N-1 sub- module capacitance C through clamp diodeCd_n-1Anode, and so on, lower bridge arm the 2nd Submodule capacitor CCd_2Anode through clamp diode be connected to first sub- module capacitance CCd_1Anode, first son of lower bridge arm Module capacitance CCd_1Anode through clamp diode be connected to the last one submodule of bridge arm C in C phaseCu_nAnode；The three-phase is complete Clamp diode is from equalizer circuit within interest field in consistent phase.
A further improvement of the present invention lies in that alternate imbalance energy flux circuit is arranged in bridge arm first in every phase Between a submodule between every phase lower bridge arm n-th submodule, circuit between two neighboring module is by two diodes, and one A auxiliary charging capacitor and an IGBT composition；Bridge arm first sub- module capacitance C in A phaseAu_1Anode connected through diode Auxiliary capacitor C1Anode, capacitor C1Cathode be connected in direct current positive bus through diode, in addition, auxiliary capacitor C1Anode warp Assist IGBT T1It is connected to the 1st module capacitance C of bridge arm in B phaseBu_1Anode, capacitor CBu_1Cathode be connected to through diode Bridge arm auxiliary capacitor C in A phase1Cathode, constitute alternate circuit, and so on, bridge arm auxiliary capacitor C in B phase2Anode through auxiliary Help IGBT T2It is connected to the 1st module capacitance C of bridge arm in C phaseCu_1Anode, CCu_1Cathode be connected in B phase bridge arm and assist Capacitor C2Cathode, likewise, bridge arm auxiliary capacitor C in C phase3It is connected to bridge arm first sub- module capacitance C in A phaseAu_1On, First module composition triangle circuit of bridge arm on three-phase；It is similar with upper bridge arm, for the alternate subsidiary loop of lower bridge arm, A phase Lower bridge arm n-th module capacitance CAd_nAnode through booster diode be connected to lower bridge arm auxiliary capacitor C4Anode, auxiliary capacitor C4 Cathode be directly connected in direct current negative busbar, C4Anode through assist IGBT T4It is connected to the last one submodule of B phase lower bridge arm Block capacitor CBd_nAnode, auxiliary capacitor C4With the last one submodule capacitor of B phase CBd_nCathode by direct current negative busbar be connected It connects, likewise, the last one submodule capacitor of B phase lower bridge arm CBd_nAnode through diode connect auxiliary capacitor C5Anode, auxiliary Capacitor C5Cathode meet direct current negative busbar, auxiliary capacitor C5Anode through assist IGBT T5It is connected to last height of C phase lower bridge arm Module capacitance CCd_nAnode, CCd_nCathode through direct current negative busbar constitute circuit, the last one submodule capacitor of C phase lower bridge arm CCd_nAnode through diode connect auxiliary capacitor C6Anode, auxiliary capacitor C6Cathode meet direct current negative busbar, auxiliary capacitor C6's Anode is through assisting IGBT T6It is connected to the last one submodule capacitor of A phase lower bridge arm CAd_nAnode, CAd_nCathode it is negative through direct current Bus constitutes circuit；In this way, the last one submodule of three-phase lower bridge arm, which also passes through alternate auxiliary circuit, constitutes triangle circuit, Realize that three-phase is full symmetric.
Compared with prior art, the present invention has the advantage that:
Submodule used in the entire topology of the present invention is identical, ensure that the original symmetry of MMC topology, clamp two in phase Pole pipe can be realized every phase Neutron module voltage automatic equalization in MMC from equalizer circuit, and the uneven energy between three-phase passes through Balance is realized in alternate imbalance energy flux circuit, and by MMC, clamp diode is from equalizer circuit, alternate uneven energy in phase The co-ordination of flow cycle three parts is measured, whole system energy automatic equalization is made.
Further, realize that submodule capacitor voltage eliminates the sensing of capacitance voltage sampling from equilibrium in MMC phase in phase Device, it is assumed that have N number of module on each bridge arm, then can save 6N voltage measurement sensor, and communicate light accordingly；This Outside, MMC module voltage automatic equalization, controller are not needing sort operation, reduce the requirement to controller, especially high pressure In large capacity converter station, submodule number is more, and the advantage is more significant.
In addition, alternate imbalance energy flux circuit is disposed adjacent to the both ends of direct current positive and negative busbar, alternate imbalance Energy is circulated by the circuit at both ends, realizes balance, and the voltage that submodule is corresponded in final three-phase also can be equal, improves module Capacitor voltage equalizing performance.
In conclusion submodule capacitor, can not only from balanced, alternate energy self-balancing topology in the full symmetric phase of three-phase Applied to flexible direct-current transmission field, static synchronous compensator (STATCOM), Research on Unified Power Quality Conditioner also may be constructed (UPQC), the FACTS device of other high-voltage large-capacities such as THE UPFC (UPFC).Indirect utilization invention topology and think of The other application occasion thought is also within interest field.
Detailed description of the invention:
Fig. 1 is that the MMC module capacitance voltage of three-phase symmetrical is topological from equilibrium；
Fig. 2 is the schematic diagram of semi-bridge type submodule；
Fig. 3 be phase internal module capacitance voltage from balanced energy circulate schematic diagram；
Fig. 4 is alternate uneven energy flux schematic diagram；
Fig. 5 is bridge arm submodule capacitor voltage stable state waveform in A phase；
Fig. 6 is A phase lower bridge arm submodule capacitor voltage stable state waveform；
Fig. 7 is bridge arm first sub- module voltage stable state waveform in every phase；
Fig. 8 is the last one submodule voltage stable state waveform of every phase lower bridge arm；
Fig. 9 is the 4th sub- module voltage stable state waveform of bridge arm in every phase.
Specific embodiment:
Topology and working principle of the invention are described in further detail below with reference to specific embodiment, it is described to be Explanation of the invention rather than limit.
1) Fig. 1 is referred to, half-bridge submodule is made of two IGBT and module capacitances；With reference to Fig. 2, three-phase symmetrical MMC module capacitance voltage is from balanced topology, and including the half-bridge MMC model being made of A, B, C three-phase, A, B, C three-phase are respectively by 2N A half-bridge submodule, 2 bridge arm reactors are connected in series；Including 6 (N-1) a clamp diodes, 9 alternate booster diodes, 6 A auxiliary capacitor, the phase of 6 auxiliary IGBT module compositions is interior to press alternate uneven energy flux circuit certainly.
2) in semi-bridge type MMC topology, the 1st submodule of bridge arm in A phase, submodule capacitor cathode is downwards and in A phase The sub- module I GBT module midpoint of the 2nd of bridge arm is connected, submodule IGBT module midpoint upwards with DC bus anode phase Connection；I-th of submodule of bridge arm in A phase, wherein the value of i be 2~N-1, submodule capacitor cathode downwards with bridge in A phase The sub- module I GBT module midpoint of the i+1 of arm is connected, submodule IGBT module midpoint upwards with bridge arm in A phase i-th- 1 sub- module capacitance cathode is connected；The n-th submodule of bridge arm in A phase, submodule capacitor CAuNCathode downwards through two A bridge arm reactor is connected with the 1st sub- module I GBT module midpoint of A phase lower bridge arm, submodule IGBT module midpoint to It is upper to be connected with the N-1 of bridge arm in A phase sub- module capacitance cathode；I-th of submodule of A phase lower bridge arm, the wherein value of i For 2~N-1, submodule capacitor cathode is connected with the sub- module I GBT module midpoint of the i+1 of A phase lower bridge arm downwards, IGBT module midpoint is connected with (i-1)-th sub- module capacitance cathode of A phase lower bridge arm upwards.B, the connection type and A of C two-phase It is mutually completely the same.
3) in phase from pressure auxiliary circuit, the last one submodule (n-th) capacitor of bridge arm C in A phaseAuNAnode The cathode of the N-1 module capacitance is connected to through booster diode, and so on, the 2nd sub- module capacitance C of bridge arm in A phaseAu2's Anode is connected to the 1st sub- module capacitance CAu1Cathode, the 1st sub- module capacitance CAu1Anode connect diode and be connected to alternate auxiliary Capacitor C1Anode；Similar, A phase lower bridge arm n-th submodule capacitor CAdNAnode be connected to N-1 through clamp diode Submodule capacitor CAd(N-1)Cathode, and so on, the 2nd sub- module capacitance C of lower bridge armAd2Anode connect through clamp diode To first sub- module capacitance CAd1Cathode, clamp diode is not added in lower bridge arm first sub- module capacitance anode.B, C two-phase The connection type mode that is connected with A it is completely the same.
4) in alternate uneven energy flux circuit, bridge arm first sub- module capacitance C in A phaseAu1Anode through two poles Pipe connects auxiliary capacitor C1Anode, capacitor cathode is connected in direct current positive bus through diode, in addition, auxiliary capacitor C1Just Pole is through assisting IGBT T1It is connected to the 1st module capacitance C of bridge arm in B phaseBu1Anode, cathode through flow back diode D1Connection To A phase upper end auxiliary capacitor C1Cathode, constitute alternate circuit.And so on, B phase auxiliary capacitor C2Anode through assist IGBT T2It is connected to the 1st module capacitance C of bridge arm in C phaseCu1Anode, cathode is through diode D2It is connected to B phase upper end auxiliary capacitor C2Cathode, likewise, C phase auxiliary capacitor is connected to A phase, first module capacitance of bridge arm is through alternate auxiliary circuit structure on three-phase At triangle circuit.It is similar with upper bridge arm, for the alternate subsidiary loop of lower bridge arm, the last one module capacitance of A phase lower bridge arm CAdNAnode through booster diode D4It is connected to lower bridge arm auxiliary capacitor C4Anode, auxiliary capacitor C4Cathode is directly connected to direct current In negative busbar, the anode of auxiliary capacitor is through assisting IGBT T4It is connected to the last one submodule capacitor of B phase lower bridge arm CBdNJust Pole, auxiliary capacitor C4With the last one submodule capacitor of B phase CBdNCathode be connected by direct current negative busbar.Likewise, B phase The last one submodule capacitor of lower bridge arm CBdNAnode through diode connect auxiliary capacitor C5Anode, auxiliary capacitor cathode connects Direct current negative busbar, auxiliary capacitor C5Anode through assist IGBT T5It is connected to the last one submodule capacitor of C phase lower bridge arm CCdNJust Pole, cathode constitute circuit through direct current negative busbar.C phase is connected to A phase with same method.In this way, the last one of three-phase lower bridge arm Submodule also passes through alternate auxiliary circuit and constitutes triangle circuit, realizes that three-phase is full symmetric.
With reference to Fig. 3, in phase during the work time from equalizer circuit, when the down tube conducting of n-th module on a certain bridge arm, If n-th module capacitance voltage is higher than the capacitance voltage of the N-1 module, with reference to Fig. 3, the anode warp of n-th module capacitance Clamp diode is connected to the anode of the N-1 module capacitance, and the down tube of n-th module is conducting, i.e. N and N-1 at this time The cathode of a module capacitance is connected, and n-th module gives the N-1 module charging, the module electricity on bridge arm each so automatically Holding voltage can be achieved with from balanced.
With reference to Fig. 4, the upper tube for the half-bridge module for assisting the driving signal of IGBT to be connect with it in alternate equilibrium circuit Driving signal be consistent；The charging modes of alternate auxiliary capacitor are consistent with phase internal module charging modes, are with bridge arm in A phase Example, when first submodule down tube conducting on upper bridge arm, module capacitance anode is connected through diode with auxiliary capacitor anode, Down tube of the auxiliary capacitor cathode through direct current positive bus and first module is connected with the cathode of first module capacitance, constitutes charging Circuit；When the first module down tube shutdown of A phase, when upper tube is opened, alternate auxiliary IGBT T1Conducting, if auxiliary capacitor voltage Higher than the capacitance voltage of first module of B phase, for auxiliary capacitor from first module charging of bridge arm in trend B phase, remaining is alternate auxiliary Help the working method in circuit all with A, the alternate circuit of the upper bridge arm of B is consistent.The mutual transmission for realizing alternate uneven energy, finally reaches To alternate energy balance.
Specifically known perfectly well by above-mentioned, mentioned topology is able to achieve phase internal module capacitance voltage from balanced, alternate imbalance energy Free flow, finally makes in phase, alternate energy all realizes equilibrium, and topology keeps three-phase full symmetric.
Embodiment:
Description according to the present invention, in examples of simulation using the capacitance voltage of three-phase symmetrical from balanced topology as shown in Figure 1, It, which is exchanged, flanks 380V AC network voltage rating, and DC side voltage rating is 700V, connects 96 Ω ohmic loads；Using 5 level Structure, i.e., every phase upper and lower bridge arm have 4 sub- half-bridge modules to constitute, and submodule capacitor is 3300 μ F, the specified electricity of submodule capacitor Pressure is 175V；Bridge arm reactor is 15mH；After system stable operation, clamp diode is from when the work of equalizer circuit in phase, son It mutually being clamped between module capacitance, voltage remains balanced, with reference to Fig. 5 and Fig. 6, by taking A phase as an example, four submodules of bridge arm in A phase Capacitance voltage UcAui, four module capacitance voltages of i=1-4 and A phase lower bridge armUcAdi, it can be balanced, and deviation is within ± 5V, Fluctuation is within 2.85%；With reference to Fig. 7, bridge arm first sub- module voltage U on A, B, C three-phasecAu1, UcBu1And UcCu1Amplitude and Rule of conversion is almost consistent, and 120 ° of phase mutual deviation, likewise, with reference to Fig. 8, the last one submodule voltage of three-phase lower bridge arm UcAd4, UcBd4And UcCd4Amplitude and rule of conversion are also almost consistent, and 120 ° of phase mutual deviation, it can thus be concluded that the electricity of three-phase symmetrical Appearance voltage is from energy voltage energy is mutually balanced between first submodule of every phase in balanced topology, voltage between the last one submodule Also can be mutually balanced, achieve the purpose that alternate uneven energy free flow.After the submodule balance of voltage at every phase both ends, by phase Interior clamp diode forces the submodule voltage on every opposite position also balanced from equalizer circuit, with reference to Fig. 9, such as A, B, C tri- Upper the 4th sub- module voltage U of bridge arm in phasecAu4, UcBu4And UcCu4It can realize equilibrium, therefore clamp diode is pressed certainly in phase The collective effect of circuit and alternate uneven energy flux circuit, makes the submodule electric voltage equalization in MMC topology, every phase mutually it Between be also able to achieve balancing energy.

Claims (2)

1. a kind of topology of oneself equilibrium of the MMC module capacitance voltage of three-phase symmetrical, which is characterized in that including three-phase semi-bridge type MMC Clamp diode is from equalizer circuit and alternate uneven energy flux circuit in model, phase；Three-phase semi-bridge type MMC model is for real Show AC-DC conversion, clamp diode forces son from equalizer circuit in the phase connecting with three-phase semi-bridge type MMC model Neutron module Module voltage automatic equalization, while uneven energy alternate in three-phase semi-bridge type MMC model passes through alternate uneven energy stream Logical circuit circulation；
For three-phase semi-bridge type MMC model by tri- phase composition of A, B, C, every phase has upper and lower two bridge arms to constitute, and has on each bridge arm N number of Semi-bridge type submodule, submodule block number is followed successively by 1-N from top to bottom on each bridge arm；Wherein in A phase bridge arm the 1st submodule Block, submodule capacitor CAu_1Cathode be connected with the 2nd sub- module I GBT module midpoint of bridge arm in A phase downwards, son Module I GBT module midpoint is connected with DC bus anode upwards, i-th of submodule of bridge arm in A phase, and wherein the value of i is 2~N-1, submodule capacitor CAu_iCathode be connected with the i+1 of bridge arm in A phase sub- module I GBT module midpoint downwards Connect, submodule IGBT module midpoint upwards with (i-1)-th sub- module capacitance C of bridge arm in A phaseAu_i-1Cathode is connected, A phase The n-th submodule of upper bridge arm, submodule capacitor CAu_nCathode downwards through two bridge arm reactor LAuAnd LAdWith bridge under A phase The sub- module I GBT module midpoint of the 1st of arm is connected, the submodule IGBT module midpoint N-1 with bridge arm in A phase upwards A sub- module capacitance CAu_n-1Cathode be connected, i-th of submodule of A phase lower bridge arm, submodule capacitor CAd_iCathode to It is lower to be connected with a sub- module I GBT module midpoint of the i+1 of A phase lower bridge arm, IGBT module midpoint upwards with A phase lower bridge arm (i-1)-th sub- module capacitance CAd_i-1Cathode be connected, A phase lower bridge arm n-th submodule capacitor CAd_nCathode directly connect To direct current negative busbar, IGBT module midpoint upwards with A phase lower bridge arm N-1 sub- module capacitance CAd_n-1Cathode be connected；B 1st submodule of bridge arm, submodule capacitor C in phaseBu_1Cathode the 2nd sub- module I GBT with bridge arm in B phase downwards Module midpoint is connected, and submodule IGBT module midpoint is connected with DC bus anode upwards, i-th of bridge arm in B phase Submodule, wherein the value of i is 2~N-1, submodule capacitor CBu_iThe cathode i+1 submodule with bridge arm in B phase downwards Block IGBT module midpoint is connected, submodule IGBT module midpoint (i-1)-th sub- module capacitance with bridge arm in B phase upwards CBu_i-1Cathode is connected, the n-th submodule of bridge arm in B phase, submodule capacitor CBu_nCathode downwards through two bridge arm electricity Anti- device LBuAnd LBdBe connected with the 1st sub- module I GBT module midpoint of B phase lower bridge arm, submodule IGBT module midpoint to The upper N-1 sub- module capacitance C with bridge arm in B phaseBu_n-1Cathode be connected, i-th of submodule of B phase lower bridge arm, son Module capacitance CBd_iCathode be connected with the i+1 of B phase lower bridge arm sub- module I GBT module midpoint downwards, IGBT module Midpoint upwards with (i-1)-th sub- module capacitance C of B phase lower bridge armBd_i-1Cathode be connected, B phase lower bridge arm n-th submodule Capacitor CBd_nCathode be directly connected to direct current negative busbar, IGBT module midpoint upwards with the N-1 submodule electricity of B phase lower bridge arm Hold CBd_n-1Cathode be connected；1st submodule of bridge arm, submodule capacitor C in C phaseCu_1Cathode downwards with bridge in C phase The sub- module I GBT module midpoint of the 2nd of arm is connected, and submodule IGBT module midpoint is connected with DC bus anode upwards It connects, i-th of submodule of bridge arm in C phase, wherein the value of i is 2~N-1, submodule capacitor CCu_iCathode downwards with C phase The sub- module I GBT module midpoint of the i+1 of upper bridge arm is connected, submodule IGBT module midpoint upwards with bridge arm in C phase (i-1)-th sub- module capacitance CCu_i-1Cathode is connected, the n-th submodule of bridge arm in C phase, submodule capacitor CCu_nIt is negative Extremely downwards through two bridge arm reactor LCuAnd LCdIt is connected with the 1st sub- module I GBT module midpoint of C phase lower bridge arm, son Module I GBT module midpoint upwards with the N-1 of bridge arm in C phase sub- module capacitance CCu_n-1Cathode be connected, C phase lower bridge arm I-th of submodule, submodule capacitor CCd_iCathode downwards and in the i+1 of C phase lower bridge arm sub- module I GBT module Point be connected, IGBT module midpoint upwards with (i-1)-th sub- module capacitance C of C phase lower bridge armCd_i-1Cathode be connected, C Phase lower bridge arm n-th submodule capacitor CCd_nCathode be directly connected to direct current negative busbar, IGBT module midpoint is upwards and under C phase N-1 sub- module capacitance C of bridge armCd_n-1Cathode be connected；A, B, C three-phase topology with above-mentioned connection relationship is completely the same；
Alternate imbalance energy flux circuit is arranged in every phase between first submodule of bridge arm and every phase lower bridge arm N Between a submodule, the circuit between two neighboring module is by two diodes, an auxiliary charging capacitor and an IGBT group At；Bridge arm first sub- module capacitance C in A phaseAu_1Anode through diode connect auxiliary capacitor C1Anode, capacitor C1Cathode It is connected in direct current positive bus through diode, in addition, auxiliary capacitor C1Anode through assist IGBT T1It is connected to bridge arm in B phase 1 module capacitance CBu_1Anode, capacitor CBu_1Cathode be connected to bridge arm auxiliary capacitor C in A phase through diode1Cathode, structure At alternate circuit, and so on, bridge arm auxiliary capacitor C in B phase2Anode through assist IGBT T2It is connected to bridge arm the 1st in C phase Module capacitance CCu_1Anode, CCu_1Cathode be connected to bridge arm auxiliary capacitor C in B phase2Cathode, likewise, bridge arm in C phase Auxiliary capacitor C3It is connected to bridge arm first sub- module capacitance C in A phaseAu_1On, first module composition triangle of bridge arm on three-phase Circuit；It is similar with upper bridge arm, for the alternate subsidiary loop of lower bridge arm, A phase lower bridge arm n-th module capacitance CAd_nAnode warp Booster diode is connected to lower bridge arm auxiliary capacitor C4Anode, auxiliary capacitor C4Cathode be directly connected in direct current negative busbar, C4 Anode through assist IGBT T4It is connected to the last one submodule capacitor of B phase lower bridge arm CBd_nAnode, auxiliary capacitor C4With B phase The last one submodule capacitor CBd_nCathode be connected by direct current negative busbar, likewise, the last one submodule of B phase lower bridge arm Block capacitor CBd_nAnode through diode connect auxiliary capacitor C5Anode, auxiliary capacitor C5Cathode connect direct current negative busbar, auxiliary electricity Hold C5Anode through assist IGBT T5It is connected to the last one submodule capacitor of C phase lower bridge arm CCd_nAnode, CCd_nCathode warp Direct current negative busbar constitutes circuit, the last one submodule capacitor of C phase lower bridge arm CCd_nAnode through diode connect auxiliary capacitor C6 Anode, auxiliary capacitor C6Cathode meet direct current negative busbar, auxiliary capacitor C6Anode through assist IGBT T6It is connected to A phase lower bridge arm most The latter submodule capacitor CAd_nAnode, CAd_nCathode through direct current negative busbar constitute circuit；In this way, three-phase lower bridge arm is most The latter submodule also passes through alternate auxiliary circuit and constitutes triangle circuit, realizes that three-phase is full symmetric.
2. a kind of MMC module capacitance voltage of three-phase symmetrical according to claim 1 exists from balanced topology, feature In clamp diode is from equalizer circuit by being connected to the clamp two of three-phase semi-bridge type MMC model Neutron module capacitance cathode in phase Pole pipe forms, bridge arm n-th submodule capacitor C in A phaseAu_nAnode through clamp diode be connected to the N-1 module capacitance CAu_n-1Anode, and so on, the 2nd sub- module capacitance C of bridge arm in A phaseAu_2Anode is connected to the 1st sub- module capacitance CAu_1's Anode, the 1st sub- module capacitance CAu_1Anode through diode be connected to alternate auxiliary capacitor C1Anode；A phase lower bridge arm n-th Submodule capacitor CAd_nAnode is connected to N-1 sub- module capacitance C through clamp diodeAd_n-1Anode, and so on, lower bridge The 2nd sub- module capacitance C of armAd_2Anode through clamp diode be connected to first sub- module capacitance CAd_1Anode, lower bridge arm One sub- module capacitance CAd_1Anode through clamp diode be connected to the last one submodule of bridge arm C in A phaseAu_nAnode；B phase Upper bridge arm n-th submodule capacitor CBu_nAnode through clamp diode be connected to the N-1 module capacitance CBu_n-1Anode, with This analogizes, the 2nd sub- module capacitance C of bridge arm in B phaseBu_2Anode is connected to the 1st sub- module capacitance CBu_1Anode, the 1st submodule Block capacitor CBu_1Anode through diode be connected to alternate auxiliary capacitor C2Anode；B phase lower bridge arm n-th submodule capacitor CBd_n Anode is connected to N-1 sub- module capacitance C through clamp diodeBd_n-1Anode, and so on, the 2nd submodule electricity of lower bridge arm Hold CBd_2Anode through clamp diode be connected to first sub- module capacitance CBd_1Anode, first sub- module capacitance of lower bridge arm CBd_1Anode through clamp diode be connected to the last one submodule of bridge arm C in B phaseBu_nAnode；Bridge arm n-th submodule in C phase Block capacitor CCu_nAnode through clamp diode be connected to the N-1 module capacitance CCu_n-1Anode, and so on, bridge arm in C phase 2nd sub- module capacitance CCu_2Anode is connected to the 1st sub- module capacitance CCu_1Anode, the 1st sub- module capacitance CCu_1Anode Alternate auxiliary capacitor C is connected to through diode3Anode；C phase lower bridge arm n-th submodule capacitor CCd_nAnode is through clamp diode It is connected to N-1 sub- module capacitance CCd_n-1Anode, and so on, the 2nd sub- module capacitance C of lower bridge armCd_2Anode through pincers Position diode is connected to first sub- module capacitance CCd_1Anode, lower bridge arm first sub- module capacitance CCd_1Anode through clamping Diode is connected to the last one submodule of bridge arm C in C phaseCu_nAnode.
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