CN104901570B - Modularization multi-level converter - Google Patents
Modularization multi-level converter Download PDFInfo
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- CN104901570B CN104901570B CN201510351437.4A CN201510351437A CN104901570B CN 104901570 B CN104901570 B CN 104901570B CN 201510351437 A CN201510351437 A CN 201510351437A CN 104901570 B CN104901570 B CN 104901570B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/0085—Partially controlled bridges
Abstract
The invention discloses a kind of modularization multi-level converter, including at least one facies unit for being made up of the first bridge arm and the second bridge arm；First bridge arm and the second bridge arm include energy storage submodule and reactor；Energy storage submodule in first bridge arm uses full-bridge submodule FBSM or class full-bridge submodule SFBSM；The energy storage submodule in second bridge arm uses half-bridge submodule HBSM simultaneously；Or, the energy storage submodule in the first bridge arm uses half-bridge submodule HBSM；The energy storage submodule in second bridge arm uses full-bridge submodule FBSM or class full-bridge submodule SFBSM simultaneously, for direct fault current isolation.The present invention is relatively all using the modularization multi-level converter of half-bridge submodule, the quantity of turn-off device only needs to add the switching loss increase for only having a bridge arm in a quarter and facies unit under optimal situation, still has DC line fault isolating power while with higher economy.
Description
Technical field
The invention belongs to field of power electronics, more particularly to modularization multi-level converter.
Background technology
Modularization multi-level converter is a kind of new change of current suitable for high pressure applications received much concern in recent years
Device, it is by the way of sub-module cascade, by controlling the state of each submodule respectively, the exchange that can export transverter
Voltage approaches sine wave, so as to reduce the harmonic content in output voltage, its appearance solves two level voltage source transverters
The series average-voltage problem of presence, has broad application prospects.
Use half-bridge submodule for prime power unit modularization transverter occur DC bipolar short trouble after, by
In the afterflow effect of diode, it is impossible to realize DC Line Fault self-cleaning by itself quick control.Full-bridge submodule is used for base
The modularization transverter of this power cell can realize that DC bipolar short trouble is removed, but IGBT quantity adds one times,
Cost and switching loss are larger.In order to reduce cost, (patent application stage, application is public for a kind of transverter and its control method
Cloth number：201310179826.4) transverter using class full-bridge topologies is proposed, IGBT quantity is also required to add one
Half, cost is reduced with respect to full-bridge submodule, but switching loss is still larger.
In order to realize higher economy, the cost and running wastage of transverter are important performance assessment criteria, therefore have must
Propose that a kind of cost and running wastage are more excellent, while having the transverter of DC bipolar short trouble Scavenging activity.
The content of the invention
The purpose of the present invention, is to provide modularization multi-level converter, this modularization multi-level converter cost and fortune
Row loss is more excellent, while having DC bipolar short trouble Scavenging activity.
In order to reach above-mentioned technical purpose, the technical solution adopted by the present invention is：Modularization multi-level converter, including extremely
A few facies unit, the facies unit includes the first bridge arm and the second bridge arm；
Described first bridge arm one end is the first direct current end points P, and the other end is used to connect exchange end points；
Described second bridge arm one end is the second direct current end points N, and the other end is also used for connection exchange end points；
First bridge arm includes at least two energy storage submodules and at least one reactor, the energy storage submodule and electricity
Anti- device is in series；
Second bridge arm includes at least two energy storage submodules and at least one reactor, the energy storage submodule and electricity
Anti- device is in series；
First bridge arm and the second bridge arm are using one of following two schemes:
I) the energy storage submodule in first bridge arm uses full-bridge submodule FBSM or class full-bridge submodule SFBSM, uses
In direct fault current isolation；The energy storage submodule in second bridge arm uses half-bridge submodule HBSM simultaneously；
Ii) or, energy storage submodule in first bridge arm uses half-bridge submodule HBSM；While second bridge arm
In energy storage submodule use full-bridge submodule FBSM or class full-bridge submodule (SFBSM), for direct fault current isolation.
As further improved technical scheme of the present invention, the facies unit is three, respectively the first facies unit, second
Facies unit and third phase unit；
The other end of first bridge arm of first facies unit is connected with exchange terminal A, the second bridge arm of the first facies unit
The other end also with exchange terminal A be connected；
The other end of first bridge arm of second facies unit is connected with exchange terminal B, the second bridge arm of the second facies unit
The other end also with exchange terminal B be connected；
The other end of first bridge arm of the third phase unit is connected with exchange terminal A, the second bridge arm of third phase unit
The other end also with exchange end points C be connected.
As further improved technical scheme of the present invention, first bridge arm or the second bridge arm also include series connection access
At least one damping module DSM；The damping module DSM is made up of turn-off device, diode, resistor coupled in parallel；It is described to close
Disconnected device diode reverse is in parallel, and resistance R and turn-off device are in parallel；
The negative electrode of damping module DSM diode described in first bridge arm points to exchange end points；Hindered described in second bridge arm
The anode of Buddhist nun's module DSM diode points to exchange end points.
As further improved technical scheme of the present invention, the damping module DSM also includes in parallel with a resistor be used for
Protect the arrester of turn-off device.
As further improved technical scheme of the present invention, when facies unit is normally run, in the damping module DSM
Turn-off device is constantly in opening state.
It is used as further improved technical scheme of the present invention, when detecting DC Line Fault generation, all turn-off devices
Turn off at once.
In the facies unit of the present invention, the energy storage submodule of a bridge arm, which is used, has the complete of direct fault current isolating power
Bridge submodule (FBSM) or class full-bridge submodule (SFBSM), the energy storage submodule of another bridge arm are all using half-bridge submodule
(HBSM) quantity of turn-off device is only needed under, the relative modularization multi-level converter using half-bridge submodule, optimal situation
The switching loss increase for only having a bridge arm in a quarter and facies unit is added, while with higher economy still
So there is DC line fault isolating power.
Beneficial effects of the present invention are：
(1) be not present in the bridge arm of transverter provided using the present invention half-bridge submodule with direct fault current every
Situation about being mixed from the submodule of ability, it is to avoid there is the submodule of direct fault current isolating power in valve side earth fault
When the overvoltage problem that is likely to occur；
(2) under optimal situation, the relatively complete modularization multi-level converter based on half-bridge submodule, turn-off device
Quantity only needs to add a quarter, and only has the switching loss increase of a bridge arm during normal operation.
(3) the first or second bridge arm of transverter facies unit provided using the present invention all using during half-bridge submodule still
With DC Line Fault isolating power；
Brief description of the drawings
Fig. 1 is the structural representation of the one embodiment for the three-phase transverter that the present invention is provided.
Fig. 2 a are one of half-bridge submodule (HBSM) structural representations.
Fig. 2 b are the two of half-bridge submodule (HBSM) structural representation.
Fig. 3 is full-bridge submodule (FBSM) structural representation.
Fig. 4 a are one of class full-bridge submodule (SFBSM) structural representations.
Fig. 4 b are the two of class full-bridge submodule (SFBSM) structural representation.
Fig. 5 is damping module (DSM) topology diagram.
Fig. 6 is the transverter facies unit structural representation comprising damping module that the present invention is provided.
Embodiment
Below with reference to drawings and the specific embodiments, technical scheme is described in detail.
Embodiment 1
This modularization multi-level converter, including at least one facies unit, the facies unit include the first bridge arm and second
Bridge arm；Described first bridge arm one end is the first direct current end points P, and the other end is used to connect exchange end points；Described second bridge arm one end
For the second direct current end points N, the other end is also used for connection exchange end points；First bridge arm include at least two energy storage submodules and
At least one reactor, the energy storage submodule and reactor are in series；Second bridge arm includes at least two energy storage submodules
Block and at least one reactor, the energy storage submodule and reactor are in series；Under first bridge arm and the second bridge arm are used
State one of two schemes:I) the energy storage submodule in first bridge arm uses full-bridge submodule FBSM or class full-bridge submodule
SFBSM, for direct fault current isolation；The energy storage submodule in second bridge arm uses half-bridge submodule HBSM simultaneously；
Ii) or, energy storage submodule in first bridge arm uses half-bridge submodule HBSM；Energy storage in second bridge arm simultaneously
Submodule uses full-bridge submodule FBSM or class full-bridge submodule (SFBSM), for direct fault current isolation.
Preferably, the facies unit is three, respectively the first facies unit, the second facies unit and third phase list
Member；The other end of first bridge arm of first facies unit with exchange terminal A be connected, the second bridge arm of the first facies unit it is another
End is also connected with exchange terminal A；The other end of first bridge arm of second facies unit is connected with exchange terminal B, and second is mutually single
The other end of second bridge arm of member is also connected with exchange terminal B；The other end of first bridge arm of the third phase unit is with exchanging
Terminal A is connected, and the other end of the second bridge arm of third phase unit is also connected with exchange end points C.First bridge arm or the second bridge
Arm also includes at least one damping module DSM of series connection access；The damping module DSM is by turn-off device, diode, resistance
Compose in parallel；The turn-off device diode reverse is in parallel, and resistance R and turn-off device are in parallel；Hindered described in first bridge arm
The negative electrode of Buddhist nun's module DSM diode points to exchange end points；The anode of damping module DSM diode refers to described in second bridge arm
To exchange end points.The damping module DSM also includes the arrester for being used to protect turn-off device in parallel with a resistor.When mutually single
During first normal operation, the turn-off device in the damping module DSM is constantly in opening state.Sent out when detecting DC Line Fault
When raw, all turn-off devices are turned off at once.
The first bridge arm and reactor and energy storage submodule in the second bridge arm can be with any amount of proportionings in the present embodiment
In any location strings connection, both reactor can be 1,2,3, or more, can be according to the arbitrary progress that puts in order
Series connection；Such as reactor can be connected on the either end of bridge arm, or be connected on the two ends of bridge arm, or even each energy storage submodule
Between by reactor connect or using reactor as a part for submodule, any position that reactor can be in bridge arm in a word
Put, if be connected in bridge arm and equivalent reactance value be equal to design load just can be because reactor is not limited position, to subtract
Limitation of the space layout to inverter design is lacked.
Further, with three facies units in the present embodiment, i.e., exemplified by three-phase modular multilevel inverter, Fig. 1 is this
The structural representation of modularization multi-level converter one embodiment, including three facies units are respectively the first facies unit, second
Facies unit and third phase unit, corresponding exchange end points are respectively terminal A, B and C, and the first direct current end points of three facies units is short
End points P is connected in, the second direct current end points short circuit of three facies units is end points N.
First facies unit also includes the first bridge arm a1 and the second bridge arm a2, and the first bridge arm a1 of the first facies unit is comprising mutual
Series connection multiple energy storage submodules be respectively submodule a11, submodule a12 to submodule a1n, and with multiple energy storage submodules
The reactor La1 of series connection, reactor La1 one end is connected with the first direct current end points P, and the port x 1 of the other end and submodule a11 connects
Connect, after submodule a11, submodule a12 to submodule a1n different port are connected with each other, submodule a1n port x 2 is with exchanging
Terminal A is coupled；Second bridge arm a2 of the first facies unit include multiple energy storage submodules for being serially connected be respectively submodule a21,
Submodule a22 is to submodule a2n, and the reactor La2 connected with multiple energy storage submodules, reactor La2 one end and second
Direct current end points N connections, the other end is connected with submodule a2n port x 2, and submodule a21, submodule a22 are to submodule a2n's
After different port is connected with each other, submodule a11 port x 1 is coupled with exchange terminal A.The submodule of the first bridge arm a1
A11, submodule a12 to submodule a1n be energy storage submodule, using full-bridge submodule as shown in Figure 3 or such as accompanying drawing 4a
Or the class full-bridge submodule SFBSM shown in 4b, for direct fault current isolation, submodule a21, the son of the second bridge arm a2
Module a22 to submodule a2n is energy storage submodule, using the half-bridge submodule HBSM as shown in accompanying drawing 2a or 2b；Or institute
State the first bridge arm a1 submodule a11, submodule a12 to submodule a1n be energy storage submodule, using such as accompanying drawing 2a or 2b institutes
The half-bridge submodule HBSM, the second bridge arm a2 that show submodule a21, submodule a22 to submodule a2n are energy storage submodule
Block, the class full-bridge submodule SFBSM using full-bridge submodule as shown in Figure 3 or as shown in accompanying drawing 4a or 4b, for direct current
Fault current is isolated.
Identical, the second facies unit also includes the first bridge arm b1 and the second bridge arm b2, the first bridge arm b1 of the second facies unit
Comprising the multiple energy storage submodules being serially connected be respectively submodule b11, submodule b12 to submodule b1n, and with multiple storages
The reactor Lb1 of energon block coupled in series, reactor Lb1 one end is connected with the first direct current end points P, and the other end is with submodule b11's
Port x 1 is connected, after submodule b11, submodule b12 to submodule b1n different port are connected with each other, submodule b1n port
X2 is coupled with exchange terminal B；It is respectively son that second bridge arm b2 of the second facies unit, which includes the multiple energy storage submodules being serially connected,
Module b21, submodule b22 are to submodule b2n, and the reactor Lb2 connected with multiple energy storage submodules, reactor Lb2 mono-
End is connected with the second direct current end points N, and the other end is connected with submodule b2n port x 2, submodule b21, submodule b22 to submodule
After block b2n different port is connected with each other, submodule b11 port x 1 is coupled with exchange terminal B.The son of the first bridge arm b1
Module b11, submodule b12 to submodule b1n be energy storage submodule, using full-bridge submodule as shown in Figure 3 or as attached
Class full-bridge submodule SFBSM shown in Fig. 4 a or 4b, for direct fault current isolation, the submodule of the second bridge arm b2
B21, submodule b22 to submodule b2n be energy storage submodule, using the half-bridge submodule HBSM as shown in accompanying drawing 2a or 2b；
Or submodule b11, the submodule b12 of the first bridge arm b1 to submodule b1n is energy storage submodule, using such as accompanying drawing 2a
Or submodule b21, the submodule b22 of half-bridge the submodule HBSM, the second bridge arm b2 shown in 2b to submodule b2n are storage
Can submodule, the class full-bridge submodule SFBSM using full-bridge submodule as shown in Figure 3 or as shown in accompanying drawing 4a or 4b, use
In direct fault current isolation.
Identical, third phase unit also includes the first bridge arm c1 and the second bridge arm c2, the first bridge arm c1 of third phase unit
Comprising the multiple energy storage submodules being serially connected be respectively submodule c11, submodule c12 to submodule c1n, and with multiple storages
The reactor Lc1 of energon block coupled in series, reactor Lc1 one end is connected with the first direct current end points P, and the other end is with submodule c11's
Port x 1 is connected, after submodule c11, submodule c12 to submodule c1n different port are connected with each other, submodule c1n port
X2 is coupled with exchange end points C；It is respectively son that second bridge arm c2 of third phase unit, which includes the multiple energy storage submodules being serially connected,
Module c21, submodule c22 are to submodule c2n, and the reactor Lc2 connected with multiple energy storage submodules, reactor Lc2 mono-
End is connected with the second direct current end points N, and the other end is connected with submodule c2n port x 2, submodule c21, submodule c22 to submodule
After block c2n different port is connected with each other, submodule c11 port x 1 is coupled with exchange end points C.The son of the first bridge arm c1
Module c11, submodule c12 to submodule c1n be energy storage submodule, using full-bridge submodule as shown in Figure 3 or as attached
Class full-bridge submodule SFBSM shown in Fig. 4 a or 4b, for direct fault current isolation, the submodule of the second bridge arm c2
C21, submodule c22 to submodule c2n be energy storage submodule, using the half-bridge submodule HBSM as shown in accompanying drawing 2a or 2b；
Or submodule c11, the submodule c12 of the first bridge arm c1 to submodule c1n is energy storage submodule, using such as accompanying drawing 2a
Or submodule c21, the submodule c22 of half-bridge the submodule HBSM, the second bridge arm c2 shown in 2b to submodule c2n are storage
Can submodule, the class full-bridge submodule SFBSM using full-bridge submodule as shown in Figure 3 or as shown in accompanying drawing 4a or 4b, use
In direct fault current isolation.
Shown in Fig. 2 a and Fig. 2 b for two kinds of half-bridge submodules with similar structures, it is anti-that the half-bridge submodule includes band
The turn-off device 11,13 and energy-storage travelling wave tube C1 of parallel diode, wherein, turn-off device 11 and the reverse parallel connection of diode 12,
Turn-off device 13 and the reverse parallel connection of diode 14；For turn-off device 11,13, it can use single gate-controlled switch device
Part, such as IGBT, IGCT, MOSFET or GTO full-controlled device, as provided herein in embodiment by taking IGBT as an example, can also be used
The structure being made up of at least two gate-controlled switch devices in series.The reverse parallel connection is the anode and turn-off device of diode
Negative electrode is connected, and the negative electrode of the diode is connected with the turn-off device anode.
In fig. 2 a, when the turn-off device 11,13 is IGBT, the emitter stage and Ke Guan of the turn-off device 11
The colelctor electrode connection of disconnected device 13, and the tie point is as the first end point X1 of energy storage submodule, the turn-off device 11
Colelctor electrode via energy-storage travelling wave tube C1 connections turn-off device 13 emitter stage；The emitter stage of turn-off device 13 is used as energy storage submodule
Second end points X2 of block.
In figure 2b, when the turn-off device is IGBT, emitter stage and the turn-off device 11 of turn-off device 13
Colelctor electrode connection, and the tie point be used as the second end points X2 of energy storage submodule, the turn-off device 11 emitter stage warp
By the colelctor electrode of energy-storage travelling wave tube C connections turn-off device 13；The colelctor electrode of turn-off device 13 is used as the first of energy storage submodule
End points X1.
Fig. 3 show the structural representation of full-bridge submodule, the full-bridge submodule include with anti-paralleled diode can
Device 21,23,25,27 and energy-storage travelling wave tube C2 are turned off, wherein, turn-off device 21 and the reverse parallel connection of diode 22 can switching off device
Part 23 and the inverse parallel of diode 24, turn-off device 25 and the inverse parallel of diode 26, turn-off device 27 and diode 28 are reverse
It is in parallel；For turn-off device 21,23,25,27, its can use single gate-controlled switch device, such as IGBT, IGCT,
The full-controlled devices such as MOSFET or GTO, as provided herein in embodiment by taking IGBT as an example, can also use and controllable be opened by least two
Close the structure that devices in series is constituted.
In figure 3, the emitter stage of turn-off device 21 is connected with the colelctor electrode of turn-off device 23, and the tie point conduct
The first end point X1 of full-bridge submodule, the colelctor electrode of the turn-off device 21 is via energy-storage travelling wave tube C2 connections turn-off device 23
Emitter stage；The colelctor electrode of the turn-off device 21 is also connected with the colelctor electrode of turn-off device 27, the turn-off device 27
Emitter stage connect the colelctor electrode of turn-off device 25, and the tie point is used as the second end points X2 of full-bridge submodule；It is described can
The emitter stage of shut-off device 25 is connected to the emitter stage of turn-off device 23.
Fig. 4 a and Fig. 4 b show two kinds of structural representations with the class full-bridge submodule of class formation, class full-bridge
Module includes the turn-off device 31,33,35 with anti-paralleled diode, diode 37 and energy-storage travelling wave tube C3, wherein, can switching off device
Part 31 and the inverse parallel of diode 32, turn-off device 33 and the reverse parallel connection of diode 34, turn-off device 35 and diode 36 are anti-
To parallel connection；For turn-off device 31,33,35, it can use single gate-controlled switch device, such as IGBT, IGCT, MOSFET
Or the full-controlled device such as GTO, as provided herein in embodiment by taking IGBT as an example, it can also use by least two gate-controlled switch devices
Structure in series.
In class full-bridge submodule shown in Fig. 4 a, the emitter stage of turn-off device 31 connects with the colelctor electrode of turn-off device 33
Connect, and the tie point, as the first end point X1 of class full-bridge submodule, the colelctor electrode of the turn-off device 31 is via energy storage member
The emitter stage of part C connections turn-off device 33；The colelctor electrode of the turn-off device 31 is also connected with the negative electrode of diode 37, described
The anode of diode 37 connects the colelctor electrode of turn-off device 35, and the tie point is used as the second end points of class full-bridge submodule
X2；The emitter stage of the turn-off device 35 is connected to the emitter stage of turn-off device 33.
In the class full-bridge submodule shown in Fig. 4 b, the emitter stage of turn-off device 35 connects the negative electrode of diode 37, and
The tie point is as the first end point X1 of class full-bridge submodule, and the colelctor electrode of the turn-off device 35 is via energy-storage travelling wave tube C3 companies
Connect the anode of diode 37；The colelctor electrode of the turn-off device 35 is also connected with the colelctor electrode of turn-off device 33, described to close
The emitter stage of disconnected device 33 connects the colelctor electrode of turn-off device 31, and the tie point is used as the second end points of class full-bridge submodule
X2, the emitter stage of the turn-off device 31 is connected to the anode of diode 37.
Fig. 5 show damping module DSM topology diagrams, by turn-off device S1 and the antiparallel diode D1 of S1, electricity
Resistance R and arrester M is composed in parallel, and diode D1 negative electrode is damping module DSM the first connection end point X1, diode D1 sun
Extremely damping module DSM the second connection end point X2.
Fig. 6 show the transverter facies unit structural representation comprising damping module, and the first bridge arm includes the reactance of series connection
L1, a damping module DSM and multiple class full-bridge submodule SFBSM1, reactance L1 one end connect the first direct current end points P, reactance
L1 other end connection damping module DSM first port X1, damping module DSM and multiple class full-bridge submodule SFBSM1 is successively
Series connection, i.e., the second port X2 of previous module is connected with the first port X1 of latter module, last class full-bridge submodule
SFBSM1 second port X2 is connected with exchange terminal A；Second bridge arm include series connection reactance L2, a damping module DSM ' and
Multiple half-bridge submodule HBSM1, reactance L2 one end connect the second direct current end points N, reactance L2 other end connection damping module
DSM second port X2, damping module DSM are sequentially connected in series with multiple half-bridge submodule HBSM1, i.e., the second port of previous module
X2 is connected with the first port X1 of latter module, and last half-bridge submodule HBSM1 first port X1 connects with exchanging terminal A
Connect；Second direct current end points N also with the earth be connected, such second direct current end points P only need an overhead line/cable can with it is another
Hold transverter connection.
Transverter facies unit comprising damping module as shown in Figure 6, when earth fault occurs for DC line, locking resistance
All switching devices, class full-bridge submodule SFBSM1 in Buddhist nun's module DSM, class full-bridge submodule SFBSM1 and damping module DSM '
Electric capacity C provide backward voltage suppress bridge arm current be zero, the energy part in fault loop is damped mould in the process
Block is consumed, and remainder is absorbed by the electric capacity C in class full-bridge submodule SFBSM1.
It should be noted that the transverter facies unit comprising damping module as shown in Figure 6, any one class full-bridge submodule
Block SFBSM1 can be as shown in Figure 3 the class full-bridge submodule SFBSM2 shown in full-bridge submodule or Fig. 4 b；In Fig. 6 the first bridge arm and
Second bridge arm only configures a damping module DSM, can also be configured multiple damping module DSM and completes identical damping function.
The technological thought of above example only to illustrate the invention, it is impossible to which protection scope of the present invention is limited with this, it is every
According to technological thought proposed by the present invention, any change done on the basis of technical scheme each falls within the scope of the present invention
Within.
Claims (6)
1. a kind of modularization multi-level converter, including at least one facies unit, the facies unit include the first bridge arm and second
Bridge arm；
Described first bridge arm one end is the first direct current end points P, and the other end is used to connect exchange end points；
Described second bridge arm one end is the second direct current end points N, and the other end is also used for connection exchange end points；
First bridge arm includes at least two energy storage submodules and at least one reactor, the energy storage submodule and reactor
It is in series；
Second bridge arm includes at least two energy storage submodules and at least one reactor, the energy storage submodule and reactor
It is in series；
It is characterized in that first bridge arm and the second bridge arm are using one of following two schemes：
I) the energy storage submodule in first bridge arm uses full-bridge submodule FBSM or class full-bridge submodule SFBSM, for straight
Flow fault current isolation；The energy storage submodule in second bridge arm uses half-bridge submodule HBSM simultaneously；
Ii) or, energy storage submodule in first bridge arm uses half-bridge submodule HBSM；Simultaneously in second bridge arm
Energy storage submodule uses full-bridge submodule FBSM or class full-bridge submodule (SFBSM), for direct fault current isolation；
The class full-bridge submodule (SFBSM) can turn off including the first turn-off device (31) with anti-paralleled diode, second
Device (33), the 3rd turn-off device (35), the 4th diode (37) and energy-storage travelling wave tube (C3), wherein, the first turn-off device
(31) with the first diode (32) inverse parallel, the second turn-off device (33) and the second diode (34) reverse parallel connection, the 3rd can
Device (35) and the 3rd diode (36) reverse parallel connection are turned off, connected mode is using one of following two schemes：
I) emitter stage of the first turn-off device (31) is connected with the colelctor electrode of the second turn-off device (33), and the tie point is made
For the first end point (X1) of class full-bridge submodule, the colelctor electrode of first turn-off device (31) connects via energy-storage travelling wave tube (C)
Connect the emitter stage of the second turn-off device (33)；The colelctor electrode of first turn-off device (31) is also connected with the 4th diode
(37) negative electrode, the anode of the 4th diode (37) connects the colelctor electrode of the 3rd turn-off device (35), and the tie point
It is used as the second end points (X2) of class full-bridge submodule；The emitter stage of 3rd turn-off device (35), which is connected to second, to be turned off
The emitter stage of device (33)；
Ii) or, the emitter stage of the 3rd turn-off device (35) connects the negative electrode of the 4th diode (37), and the tie point conduct
The first end point (X1) of class full-bridge submodule, the colelctor electrode of the 3rd turn-off device (35) is connected via energy-storage travelling wave tube (C3)
The anode of 4th diode (37)；The colelctor electrode of 3rd turn-off device (35) is also connected with the second turn-off device (33)
Colelctor electrode, the emitter stage of second turn-off device (33) connects the colelctor electrode of the first turn-off device (31), and the connection
The second end points (X2) as class full-bridge submodule is put, the emitter stage of first turn-off device (31) is connected to the four or two pole
Manage the anode of (37).
2. modularization multi-level converter as claimed in claim 1, it is characterised in that：
The facies unit is three, respectively the first facies unit, the second facies unit and third phase unit；
The other end of first bridge arm of first facies unit with exchange terminal A be connected, the second bridge arm of the first facies unit it is another
One end is also connected with exchange terminal A；
The other end of first bridge arm of second facies unit with exchange terminal B be connected, the second bridge arm of the second facies unit it is another
One end is also connected with exchange terminal B；
The other end of first bridge arm of the third phase unit with exchange end points C be connected, the second bridge arm of third phase unit it is another
One end is also connected with exchange end points C.
3. modularization multi-level converter as claimed in claim 1 or 2, it is characterised in that：First bridge arm or the second bridge
Arm also includes at least one damping module DSM of series connection access；The damping module DSM is by turn-off device, diode, resistance
Compose in parallel；The turn-off device diode reverse is in parallel, and resistance R and turn-off device are in parallel；
The negative electrode of damping module DSM diode described in first bridge arm points to exchange end points；Mould is damped described in second bridge arm
The anode of block DSM diode points to exchange end points.
4. modularization multi-level converter as claimed in claim 3, it is characterised in that：The damping module DSM also include with
The arrester for being used to protect turn-off device of resistor coupled in parallel.
5. modularization multi-level converter as claimed in claim 3, it is characterised in that：It is described when facies unit is normally run
Turn-off device in damping module DSM is constantly in opening state.
6. modularization multi-level converter as claimed in claim 3, it is characterised in that：When detecting DC Line Fault generation,
All turn-off devices are turned off at once.
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| CN105406743A (en) * | 2015-09-22 | 2016-03-16 | 华南理工大学 | Hybrid modular multi-level converter with asymmetric bridge arms |
| CN108233689B (en) * | 2018-01-12 | 2021-06-18 | 南京南瑞继保电气有限公司 | Power conversion device and control method |
| CN109039100A (en) * | 2018-07-25 | 2018-12-18 | 许继集团有限公司 | A kind of semibridge system submodule of modularization multi-level converter |
| CN110417290B (en) * | 2019-07-23 | 2020-09-04 | 国网江苏省电力有限公司扬州供电分公司 | Novel modular multilevel converter submodule topological circuit and control method thereof |
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| CN102931863A (en) * | 2012-11-12 | 2013-02-13 | 华北电力大学 | Method for setting up modularized multi-level converter composite structure model |
| BR102012023337A2 (en) * | 2012-09-17 | 2014-10-29 | Universidade Federal De Santa Catarina | MODULAR MULTILEVEL STATIC CONVERTERS SYSTEM |
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| US10069430B2 (en) * | 2013-11-07 | 2018-09-04 | Regents Of The University Of Minnesota | Modular converter with multilevel submodules |
| CN204669246U (en) * | 2015-06-23 | 2015-09-23 | 南京南瑞继保电气有限公司 | Modularization multi-level converter |
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| BR102012023337A2 (en) * | 2012-09-17 | 2014-10-29 | Universidade Federal De Santa Catarina | MODULAR MULTILEVEL STATIC CONVERTERS SYSTEM |
| CN102931863A (en) * | 2012-11-12 | 2013-02-13 | 华北电力大学 | Method for setting up modularized multi-level converter composite structure model |
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