CN108023494A - A kind of modularization multi-level converter and its sub-modular structure - Google Patents

A kind of modularization multi-level converter and its sub-modular structure Download PDF

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Publication number
CN108023494A
CN108023494A CN201610951470.5A CN201610951470A CN108023494A CN 108023494 A CN108023494 A CN 108023494A CN 201610951470 A CN201610951470 A CN 201610951470A CN 108023494 A CN108023494 A CN 108023494A
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China
Prior art keywords
switching tube
branch
sub
modular structure
switch pipe
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CN201610951470.5A
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CN108023494B (en
Inventor
迟永宁
李琰
李武华
孙蔚
杨贺雅
董玉斐
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Zhejiang University ZJU
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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Zhejiang University ZJU
State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd CEPRI
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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

Abstract

The present invention provides a kind of modularization multi-level converter and its sub-modular structure, wherein：Multilevel converter includes：Inductance and the sub-modular structure mutually cascaded, inductance and sub-modular structure bridge arm in series, two groups of bridge arm phase elements in series；Sub-modular structure includes：Positive terminal branch, negative pole end branch, capacitive branch and two-way power switch branch；Positive terminal branch is in parallel with capacitive branch, and the midpoint of the both ends of two-way power switch branch respectively with positive terminal branch and capacitive branch is connected；One end of negative pole end branch is connected with the parallel connection of positive terminal branch and capacitive branch, its other end is connected with the midpoint of capacitive branch.Technical solution provided by the invention is applied in MMC HVDC systems, the autonomous protection of DC Line Fault can be achieved, and due to the symmetry of structure, so that sub-modular structure is under non-blocking mode, output characteristics is that symmetrical, good symmetry is conducive to maintain the current stress of power device and capacitance in submodule to balance on current direction.

Description

A kind of modularization multi-level converter and its sub-modular structure
Technical field
The present invention relates to flexible direct current transmission ＆ distribution electro-technical field, and in particular to a kind of modularization multi-level converter and its son Modular structure.
Background technology
Modularization multi-level converter (Modular Multilevel Converter, MMC) from 2002 come out since, With the features such as degree of modularity is high, output waveform quality is good, step voltage is low, devices switch frequency is low, high straightening is had become Flow in (High Voltage Direct Current, HVDC) transmission system transverter topological structure most with prospects it One.In the MMC-HVDC projects to put into operation at present mostly using half-bridge submodule (Half Bridge Sub-Module, HBSM) structure, structure power device quantity is few, system cost is low, operational efficiency is high for this, but transverter when DC side breaks down Itself does not possess active defense capability, need to be by exchange relay protection device isolated fault.
Dc-side short-circuit fault is a kind of direct current transportation particularly common failure in overhead transmission line.At present, processing is straight Stream side failure mainly has three kinds of modes：1) by the alternating current equipment such as disengagement failure such as AC circuit breaker, AC fuse with exchanging The contact of system；2) contacting by the blocking-failures such as DC equipment such as dc circuit breaker and transverter；3) by transverter The isolation of DC side failure is realized in the switch motion of power semiconductor.But the first processing mode is led due to its mechanical restriction Cause the response time length of alternating current equipment, restart complexity；The shortcoming of second of processing mode be dc circuit breaker technology still not Ripe and cost is high, it is difficult to applied in Practical Project；Two ways than before, the third mode response time is fast, after failure The ability that system recovers normal operation is strong, so the effective solution way of one kind as processing MMC-HVDC dc-side short-circuit faults Footpath.
At present, it can realize that representative in the sub-modular structure of DC Line Fault protection is full-bridge submodule (Full Bridge Sub-Module, FBSM) and clamp Shuangzi module (Clamp Double Sub-Module, CDSM) structure.Entirely The power semiconductor number of bridge submodule is twice of half-bridge submodule, increases system cost, reduces the fortune of transverter Line efficiency；It is although simple for structure to clamp Shuangzi module, but fault-tolerant ability is poor, once clamp switch pipe damage submodule will be unable to reality The normal output of existing level, influences the normal operation of whole system.
Accordingly, it is desirable to provide a kind of technical solution meets the needs of the prior art.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of modularization multi-level converter and its submodule Structure, wherein：Modularization multi-level converter includes inductance, the sub-modular structure mutually cascaded, and inductance is connected structure with submodule Into bridge arm, two groups of bridge arm phase elements in series.
Sub-modular structure includes：Positive terminal branch, negative pole end branch, capacitive branch and two-way power switch branch；Cathode Hold branch in parallel with capacitive branch, the both ends of the two-way power switch branch midpoint phase with positive terminal branch and capacitive branch respectively Even；One end of negative pole end branch is connected with the parallel connection of positive terminal branch and capacitive branch, the midpoint of its other end and capacitive branch It is connected.
Positive terminal branch includes：The switching tube S1 and S2 of the anti-simultaneously diode of two bands；The emitter of first switch pipe S1 with The collector of second switch pipe S2 is connected.
Negative pole end branch includes：The switching tube S3 and S4 of the anti-simultaneously diode of two bands；The emitter of 3rd switching tube S3 with The collector of 4th switching tube S4 is connected.
Capacitive branch includes：Two the capacitance C1 and C2 being serially connected；
The positive terminal of first capacitance C1 is connected with the collector of first switch pipe S1, the negative pole end and second of the second capacitance C2 The emitter of switching tube S2 and the 4th switching tube S4 are connected, the intermediate node phase of the collector and capacitive branch of the 3rd switching tube S3 Even.
Two-way power switch branch includes：The switching tube S5 and S6 of the anti-simultaneously diode of two bands；Two-way power switch branch One end be connected with the collector of the 5th switching tube S5, the current collection of the other end of two-way power switch branch and the 6th switching tube S6 Extremely it is connected, the emitter of the 5th switching tube S5 is connected with the emitter of the 6th switching tube S6.
Another preferred solution of two-way power switch branch, including：Two switching tubes S5 and S6 in parallel；5th switch The collector of pipe S5 is connected with the emitter of the 6th switching tube S6.
Band is anti-and the base stage of the switching tube of diode receives the switch controlling signal that external equipment provides；The anti-simultaneously diode of band Switching tube be IGBT type switching tubes.
The operational mode of sub-modular structure includes normal mode, non-blocking mode or STATCOM patterns；
Normal mode includes：+ 2E ,+1E and 0 three kinds of level modes；STATCOM patterns include：Three kinds of electricity of+1E, 0 and -1E It is flat-die type powdered.
Normal mode and STATCOM patterns include 6 kinds of on off states：
First switch state：First switch pipe S1, the 4th switching tube S4 and the 6th switching tube S6 are open-minded；Second switch pipe S2, the 3rd switching tube S3 and the 5th switching tube S5 shut-offs；
Second switch state：First switch pipe S1, the 3rd switching tube S3 and the 6th switching tube S6 are open-minded；Second switch pipe S2, the 4th switching tube S4 and the 5th switching tube S5 shut-offs；
3rd on off state：4th switching tube S4, the 5th switching tube S5 and the 6th switching tube S6 are open-minded；First switch pipe S1, second switch pipe S2 and the 3rd switching tube S3 shut-offs；
4th on off state：3rd switching tube S3, the 5th switching tube S5 and the 6th switching tube S6 are open-minded；First switch pipe S1, second switch pipe S2 and the 4th switching tube S4 shut-offs；
5th on off state：Second switch pipe S2, the 4th switching tube S4 and the 5th switching tube S5 are open-minded；First switch pipe S1, the 3rd switching tube S3 and the 6th switching tube S6 shut-offs；
6th on off state：Second switch pipe S2, the 3rd switching tube S3 and the 5th switching tube S5 are open-minded；First switch pipe S1, the 4th switching tube S4 and the 6th switching tube S6 shut-offs；
Non-blocking mode includes 2 kinds of on off states：
7th on off state：The gate signal of the whole switching tubes of shut-off, current direction from positive terminal flow to negative pole end when, electricity The anti-and diode that stream passes through in first switch pipe S1 and the 4th switching tube S4 charges to the first capacitance C1 and the second capacitance C2；
8th on off state：The gate signal of the whole switching tubes of shut-off, current direction from negative pole end flow to positive terminal when, electricity The anti-and diode flowed through in second switch pipe S2 and the 3rd switching tube S3 charges to the second capacitance C2.
Compared with the latest prior art, technical solution provided by the invention has the advantages that：
1st, under non-blocking mode, the submodule capacitance of technical solution provided by the invention is all put into bridge arm, submodule Capacitance charges, and produces inverse electromotive force, has the function of isolated DC side failure；
2nd, in MMC-HVDC systems, the autonomous protection of DC Line Fault can be realized using technical solution provided by the invention, And due to the symmetry of structure so that sub-modular structure under non-blocking mode, output characteristics on current direction be it is symmetrical, it is good Good symmetry is conducive to maintain the current stress of power device and capacitance in submodule to balance；
3rd, in HCMC-HVDC systems, have using technical solution provided by the invention lower than full-bridge sub-modular structure Conduction loss, the operational efficiency of system is improved.
Brief description of the drawings
Fig. 1 is the topology diagram of the single-ended three-phase modular multilevel inverter of the present invention；
Fig. 2 is a kind of topological schematic diagram of MMC sub-modular structures of the present invention；
Fig. 3 is the topological schematic diagram of another kind of MMC sub-modular structures of the present invention；
Fig. 4 is the first switch view of MMC sub-modular structures of the present invention；
Fig. 5 is the second switch view of MMC sub-modular structures of the present invention；
Fig. 6 is the 3rd on off state schematic diagram of MMC sub-modular structures of the present invention；
Fig. 7 is the 4th on off state schematic diagram of MMC sub-modular structures of the present invention；
Fig. 8 is the 5th on off state schematic diagram of MMC sub-modular structures of the present invention；
Fig. 9 is the 6th on off state schematic diagram of MMC sub-modular structures of the present invention；
Figure 10 is the 7th on off state schematic diagram of MMC sub-modular structures of the present invention；
Figure 11 is the 8th on off state schematic diagram of MMC sub-modular structures of the present invention.
Embodiment
Technical scheme is described in further details with reference to Figure of description.
The invention discloses a kind of Modularized multi-level converter sub-module structure with fault traversing, it passes through The on off state of redundancy adjusts the current stress balance of 2 capacitances and 8 power switch pipes in submodule；In the normal mode may be used Three kinds of level are exported, improve the level integrated level of submodule；Under non-blocking mode, submodule capacitance all puts into bridge arm In, the charging of submodule capacitance, produces inverse electromotive force, plays the function of isolated DC side failure.Sub-modular structure of the present invention should , it can be achieved that the autonomous of DC Line Fault protects in MMC-HVDC systems, and due to the symmetry of structure so that sub-modular structure Under non-blocking mode, output characteristics is that symmetrical, good symmetry is conducive to maintain power in submodule on current direction The current stress of device and capacitance balances；Apply in HCMC-HVDC systems, there is the conducting lower than full-bridge sub-modular structure Loss, the operational efficiency of system are improved.
The sub-modular structure of the present invention includes：4 with anti-and diode switching tube S1~S4,2 capacitance C1~C2 And 1 two-way power switch, wherein：The emitter of switching tube S1 is connected with the collector of switching tube S2 and is sub-modular structure Positive terminal, the collector of switching tube S1 is connected with the positive terminal of capacitance C1, the emitter of switching tube S2 and the anode of capacitance C2 The emitter of end and switching tube S4 are connected, and the negative pole end of capacitance C1 is connected with the positive terminal of capacitance C2 and is used as intermediate node, opens The collector for closing pipe S3 is connected with intermediate node, and the emitter of switching tube S3 is connected with the collector of switching tube S4 and is submodule The negative pole end of structure, one end of two-way switch pipe are connected with submodule positive terminal, the other end and intermediate node of two-way switch pipe It is connected.The base stage of four switching tube S1~S4 receives the switch controlling signal provided from external equipment, and 4 with anti-and two Switching tube S1~S4 of pole pipe uses IGBT.
Two-way power switch is formed by 2 with anti-and diode switching tube S5~S6；Wherein, the current collection of switching tube S5 Extremely one end of two-way power switch, the emitter of switching tube S5 are connected with the emitter of switching tube S6, the current collection of switching tube S6 The extremely other end of two-way power switch, the base stage of 2 switching tube S5~S6 receive the switch control provided from external equipment Signal processed.
Two-way power switch is formed by 2 without anti-and diode switching tube S5~S6；Wherein, the collection of switching tube S5 Electrode is connected with the emitter of switching tube S6 and is one end of two-way power switch, and the emitter of switching tube S5 is with switching tube S6's Collector is connected and is the other end of two-way power switch, and the base stage of 2 switching tube S5~S6 is received to be carried from external equipment The switch controlling signal of confession, 2 use IGBT with anti-and diode switching tube S5~S6.
There are three kinds of operational modes (normal mode, non-blocking mode and STATCOM patterns) for MMC sub-modular structures of the present invention； Exportable+2E ,+1E and 0 three kinds of level in the normal mode, improve the level integrated level of submodule；Under non-blocking mode, son Module capacitance is all put into bridge arm, and the charging of submodule capacitance, produces inverse electromotive force, play the work(of isolated DC side failure Energy；Under STATCOM patterns, three kinds of level of exportable+1E, 0 and -1E, realize the reactive power support to AC system.The present invention The on-state loss of MMC submodules is less than MMC full-bridge sub-modular structures, is conducive to improve the running efficiency of system of MMC-HVDC；Can Negative level is actively exported, troubleshooting is more flexible compared with clamp Shuangzi module.
As shown in Figure 1, the elementary cell of single-ended three-phase modular multilevel inverter (MMC) is submodule (Sub- Module, SM), N number of sub-module cascade and a bridge arm inductance bridge arm in series, upper and lower two bridge arms in series one A phase element.Three-phase MMC transverters contain three phase elements, 6 bridge arms, 6N submodule.DC side busbar voltage is Udc, hand over It is respectively u to flow side three-phase phase voltagea、ubAnd uc, O points are Zero potential reference.
MMC sub-modular structures as shown in Figure 2, the sub-modular structure include four with anti-and diode switching tube S1 ~S4, two capacitance C1~C2 and 1 two-way power switch；Wherein：
The emitter of switching tube S1 is connected with the collector of switching tube S2 and for the positive terminal of sub-modular structure, switching tube S1 Collector be connected with the positive terminal of capacitance C1, the transmitting of the emitter of switching tube S2 and the negative pole end of capacitance C2 and switching tube S4 Extremely it is connected, the negative pole end of capacitance C1 is connected with the positive terminal of capacitance C2 and is used as intermediate node, and the collector of switching tube S3 is with Intermediate node is connected, and the emitter of switching tube S3 is connected with the collector of switching tube S4 and is the negative pole end of sub-modular structure, two-way One end of switching tube is connected with submodule positive terminal, and the other end of two-way switch pipe is connected with intermediate node, and 4 with anti-and two Switching tube S1~S4 of pole pipe uses IGBT.
Two-way power switch in Fig. 2 is formed by 2 with anti-and diode switching tube S5~S6；Wherein, two-way work( The both ends of rate switch are respectively the collector of switching tube S5 and the collector of switching tube S6, the collector and positive terminal of switching tube S5 It is connected, the emitter of switching tube S5 is connected with the emitter of switching tube S6, and the collector of switching tube S6 is connected with intermediate node, The base stage of two switching tube S5~S6 receives the switch controlling signal provided from external equipment.
Optionally, two-way power switch is formed by 2 without anti-and diode switching tube S5~S6；Specifically As shown in figure 3, wherein, the collector of switching tube S5 is connected with the emitter of switching tube S6 and is one end of two-way power switch, The emitter of switching tube S5 is connected with the collector of switching tube S6 and is the other end of two-way power switch.Switching tube S5~S6 is equal Using IGBT.
Fig. 4-Figure 11 is the current flow diagrams under the different on off states of present embodiment MMC sub-modular structures.Fig. 4-Fig. 9 For 6 kinds of on off state current flow diagrams under normal mode or STATCOM patterns；Figure 10-Figure 11 is 2 kinds under non-blocking mode and opens Off status current flow diagrams.Following table is a kind of MMC submodules of the modularization multi-level converter with active fault ride-through capacity The on off state table of block structure.
On off state table in table gives the on off state under normal mode, STATCOM patterns and non-blocking mode, normally Under pattern, submodule switches between on off state 1~5, is equivalent to two half-bridge submodule series connection, under STATCOM patterns, Submodule switches between on off state 2~6, is equivalent to a full-bridge submodule.
Each on off state in above table is specifically introduced below in conjunction with the accompanying drawings.
As shown in figure 4, on off state 1：S1, S4 and S6 are open-minded；S2, S3 and S5 are turned off.Capacitance C1 and C2 pass through switching tube S1 and S4 are put into bridge arm, and the AB output voltages USM of submodule is the sum of voltage on capacitance C1 and C2, theoretical value+2E, its In, E is the theoretical value of each submodule capacitor voltage.Under this on off state, electric current two-way flow, sense of current determines son The charging and discharging state of module capacitance C1 and C2.
As shown in figure 5, on off state 2：S1, S3 and S6 are open-minded；S2, S4 and S5 are turned off.Capacitance C1 by switching tube S1 and Switching tube S3 is put into bridge arm, and capacitance C2 is bypassed.Submodule AB output voltages USM is the magnitude of voltage on capacitance C1, theoretical It is worth for+E.Under this on off state, electric current two-way flow, sense of current determines the charging and discharging state of submodule capacitance C1.
As shown in fig. 6, on off state 3：S4, S5 and S6 are open-minded；S1, S2 and S3 are turned off.Capacitance C2 passes through two-way switch pipe Put into switching tube S4 in bridge arm, capacitance C1 is bypassed.Submodule AB output voltages USM is the magnitude of voltage on capacitance C2, is managed It is+E by value.Under this on off state, electric current two-way flow, sense of current determines the charging and discharging state of submodule capacitance C2. On off state 2 and on off state 3 have identical submodule external characteristics, and output voltage USM is+E, and two kinds of on off states can be distinguished Discharge and recharge is carried out to capacitance C1 and C2, this is conducive to the balance of voltage for maintaining C1, C2.
As shown in fig. 7, on off state 4：S3, S5 and S6 are open-minded；S1, S2 and S4 are turned off.Capacitance C1 and C2 are bypassed, son Modules A B output voltages USM is zero.Electric current passes through two-way switch pipe and switching tube S3 two-way flows.
As shown in figure 8, on off state 5：S2, S4 and S5 are open-minded；S1, S3 and S6 are turned off.Capacitance C1 and C2 are bypassed, son Modules A B output voltages USM is zero.Electric current passes through switching tube S2 and S4 two-way flow.
As shown in figure 9, on off state 6：S2, S3 and S5 are open-minded；S1, S4 and S6 are turned off.Capacitance C2 is bypassed, submodule AB Output voltage USM is-E.Electric current passes through switching tube S2 and S3 two-way flow.
As shown in Figure 10, on off state 7：The gate signal shut-off of whole power semiconductors, current direction is from submodule The A ends of block flow to B ends, and the IGBT that electric current passes through in switching tube S1 and S4 is anti-and diode charges to capacitance C1 and C2, submodule Output voltage USM be the sum of voltage on capacitance C1 and C2+2E.
As shown in figure 11, on off state 8：The gate signal shut-off of whole power semiconductors, current direction is from submodule The B ends of block flow to A ends, and the IGBT that electric current passes through in switching tube S2 and S3 is anti-and diode charges to capacitance C2, submodule it is defeated It is-E to go out voltage USM.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof, institute The those of ordinary skill in category field with reference to above-described embodiment still can to the present invention embodiment modify or Equivalent substitution, these are applying for this pending hair without departing from any modification of spirit and scope of the invention or equivalent substitution Within bright claims.

Claims (10)

  1. A kind of 1. sub-modular structure of modularization multi-level converter, it is characterised in that
    The sub-modular structure includes：Positive terminal branch, negative pole end branch, capacitive branch and two-way power switch branch；
    The positive terminal branch is in parallel with the capacitive branch, the both ends of the two-way power switch branch respectively with the cathode End branch is connected with the intermediate node of the capacitive branch；
    One end of the negative pole end branch is connected with the parallel connection of the positive terminal branch and the capacitive branch, its other end and institute The intermediate node for stating capacitive branch is connected.
  2. 2. sub-modular structure according to claim 1, it is characterised in that the positive terminal branch includes：Two bands are anti-simultaneously The switching tube (S1 and S2) of diode；
    The emitter of first switch pipe (S1) is connected with the collector of second switch pipe (S2).
  3. 3. sub-modular structure according to claim 2, it is characterised in that the negative pole end branch includes：
    The switching tube (S3 and S4) of the anti-simultaneously diode of two bands；The emitter of 3rd switching tube (S3) and the 4th switching tube (S4) Collector is connected.
  4. 4. sub-modular structure according to claim 3, it is characterised in that the capacitive branch includes：Two are serially connected Capacitance (C1 and C2)；
    The positive terminal of first capacitance (C1) is connected with the collector of the first switch pipe (S1), the negative pole end of the second capacitance (C2) It is connected with the emitter of the second switch pipe (S2) and the 4th switching tube (S4), the current collection of the 3rd switching tube (S3) Pole is connected with the intermediate node of the capacitive branch.
  5. 5. sub-modular structure according to claim 4, it is characterised in that the two-way power switch branch includes：Two The switching tube (S5 and S6) of the anti-simultaneously diode of band；
    One end of the extremely described two-way power switch branch of current collection of 5th switching tube (S5), its with the positive terminal branch Intermediate node is connected；The other end of the extremely described two-way power switch branch of current collection of 6th switching tube (S6), itself and the capacitance The intermediate node of branch is connected；The emitter and the emitter phase of the 6th switching tube (S6) of 5th switching tube (S5) Even.
  6. 6. sub-modular structure according to claim 4, it is characterised in that the two-way power switch branch includes：It is in parallel Two switching tubes (S5 and S6)；
    The collector of 5th switching tube (S5) is connected with the emitter of the 6th switching tube (S6)；
    The emitter of 5th switching tube (S5) is connected with the collector of the 6th switching tube (S6).
  7. 7. sub-modular structure according to claim 2, it is characterised in that
    The band is anti-and the base stage of the switching tube of diode receives the switch controlling signal that external equipment provides；
    The band is anti-and the switching tube of diode is IGBT type switching tubes.
  8. 8. the sub-modular structure according to claim 5 or 6, it is characterised in that the operational mode bag of the sub-modular structure Include normal mode, non-blocking mode or STATCOM patterns；
    The normal mode includes：+ 2E ,+1E and 0 three kinds of level modes；
    The non-blocking mode includes：+ 2E and two kinds of level modes of-E；
    The STATCOM patterns include：Three kinds of level modes of+1E, 0 and -1E.
  9. 9. sub-modular structure according to claim 8, it is characterised in that the normal mode and the STATCOM patterns Including 6 kinds of on off states：
    First switch state：The first switch pipe (S1), the 4th switching tube (S4) and the 6th switching tube (S6) are opened It is logical；The second switch pipe (S2), the 3rd switching tube (S3) and the 5th switching tube (S5) shut-off；
    Second switch state：The first switch pipe (S1), the 3rd switching tube (S3) and the 6th switching tube (S6) are opened It is logical；The second switch pipe (S2), the 4th switching tube (S4) and the 5th switching tube (S5) shut-off；
    3rd on off state：4th switching tube (S4), the 5th switching tube (S5) and the 6th switching tube (S6) are opened It is logical；The first switch pipe (S1), the second switch pipe (S2) and the 3rd switching tube (S3) shut-off；
    4th on off state：3rd switching tube (S3), the 5th switching tube (S5) and the 6th switching tube (S6) are opened It is logical；The first switch pipe (S1), the second switch pipe (S2) and the 4th switching tube (S4) shut-off；
    5th on off state：The second switch pipe (S2), the 4th switching tube (S4) and the 5th switching tube (S5) are opened It is logical；The first switch pipe (S1), the 3rd switching tube (S3) and the 6th switching tube (S6) shut-off；
    6th on off state：The second switch pipe (S2), the 3rd switching tube (S3) and the 5th switching tube (S5) are opened It is logical；The first switch pipe (S1), the 4th switching tube (S4) and the 6th switching tube (S6) shut-off；
    The non-blocking mode includes 2 kinds of on off states：
    7th on off state：The gate signal of the whole switching tubes of shut-off, current direction flow to the negative pole end from the positive terminal When, the electric current passes through anti-and diode in the first switch pipe (S1) and the 4th switching tube (S4) to described first Capacitance (C1) and second capacitance (C2) charging；
    8th on off state：The gate signal of the whole switching tubes of shut-off, current direction flow to the positive terminal from the negative pole end When, the electric current is electric to described second through the anti-and diode in the second switch pipe (S2) and the 3rd switching tube (S3) Hold (C2) charging.
  10. 10. a kind of modularization multi-level converter, including inductance, it is characterised in that：Further include mutually cascade such as claim The sub-modular structure any 1-9, the inductance and submodule bridge arm in series, bridge arm described in two groups are in series Phase element.
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CN108872842A (en) * 2018-06-11 2018-11-23 浙江大学 A kind of MMC submodule open-circuit fault diagnostic method
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CN110943636B (en) * 2019-11-25 2023-04-28 国网山东省电力公司潍坊供电公司 Multi-level module for eliminating direct current short-circuit current
CN112803758A (en) * 2021-01-15 2021-05-14 西安交通大学 Non-isolated high-voltage direct current-direct current converter with fault blocking function and method
CN112803758B (en) * 2021-01-15 2021-12-28 西安交通大学 Non-isolated high-voltage direct current-direct current converter with fault blocking function and method
CN112671253A (en) * 2021-03-15 2021-04-16 四川华泰电气股份有限公司 Cascaded H-bridge converter, open-circuit fault redundancy processing method, medium, and apparatus
CN113992037A (en) * 2021-12-30 2022-01-28 华北电力大学（保定） Bidirectional self-blocking plug module topological structure and fault ride-through method thereof

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