CN104901570A - Modularized multi-level current converter - Google Patents
Modularized multi-level current converter Download PDFInfo
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- CN104901570A CN104901570A CN201510351437.4A CN201510351437A CN104901570A CN 104901570 A CN104901570 A CN 104901570A CN 201510351437 A CN201510351437 A CN 201510351437A CN 104901570 A CN104901570 A CN 104901570A
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- brachium pontis
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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
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Abstract
The invention discloses a modularized multi-level current converter. The modularized multi-level current converter comprises at least one phase unit formed by a first bridge arm and a second bridge arm. Each of the first bridge arm and the second bridge arm comprises an energy storage sub-module and a reactor. The energy storage sub-module of the first bridge arm adopts a full bridge sub-module FBSM or a similar full bridge sub-module SFBSM; simultaneously, the energy storage sub-module of the second bridge arm adopts a half-bridge sub-module HBSM; or, the energy storage sub-module of the first bridge arm adopts a half-bridge sub-module HBSM; and simultaneously, the energy storage sub-module of the second bridge arm adopts a full bridge sub-module FBSM or a similar full bridge sub-module SFBSM used for direct current fault current isolation. Compared with a modularized multi-level current converter fully adopting the half-bridge sub-modules, the number of turn-off devices is only increased by one fourth under the optimal condition, the switch loss of only one bridge arm in the phase units is increased, the economical performance is relatively high, and at the same time, the direct current line fault isolation capability is available.
Description
Technical field
The invention belongs to field of power electronics, particularly modularization multi-level converter.
Background technology
Modularization multi-level converter is a kind of novel converter being applicable to high pressure applications received much concern in recent years, it adopts the mode of sub module cascade, by controlling the state of each submodule respectively, the alternating voltage that converter can be made to export approaches sine wave, thus the harmonic content in reduction output voltage, its appearance solves the series average-voltage problem of two level voltage source converters existence, has broad application prospects.
Adopt half-bridge submodule be the modularization converter of prime power unit after generation DC bipolar short trouble, due to the afterflow effect of diode, self quick control realization DC Line Fault self-cleaning can not be relied on.Employing full-bridge submodule is that the modularization converter of prime power unit can realize the removing of DC bipolar short trouble, but the quantity of IGBT adds one times, and cost and switching loss are all larger.In order to reduce cost, a kind of converter and control method (patent application stage thereof, application publication number: 201310179826.4) propose the converter adopting class full-bridge topologies, the quantity of IGBT also needs to add half, the relative full-bridge submodule of cost reduces, but switching loss is still larger.
In order to realize higher economy, the cost of converter and running wastage are important performance assessment criteria, are therefore necessary to propose a kind of cost and running wastage is all more excellent, have the converter of DC bipolar short trouble Scavenging activity simultaneously.
Summary of the invention
Object of the present invention, is to provide modularization multi-level converter, and this modularization multi-level converter cost and running wastage are all more excellent, has DC bipolar short trouble Scavenging activity simultaneously.
In order to reach above-mentioned technical purpose, the technical solution used in the present invention is: modularization multi-level converter, comprises at least one facies unit, and described facies unit comprises the first brachium pontis and the second brachium pontis;
Described first brachium pontis one end is the first direct current end points P, and the other end is for connecting interchange end points;
Described second brachium pontis one end is the second direct current end points N, and the other end is also for connecting interchange end points;
Described first brachium pontis comprises at least two energy storage submodules and at least one reactor, and described energy storage submodule and reactor are in series;
Described second brachium pontis comprises at least two energy storage submodules and at least one reactor, and described energy storage submodule and reactor are in series;
Described first brachium pontis and the second brachium pontis adopt one of following two schemes:
I) the energy storage submodule in described first brachium pontis adopts full-bridge submodule FBSM or class full-bridge submodule SFBSM, isolates for direct fault current; Energy storage submodule simultaneously in described second brachium pontis adopts half-bridge submodule HBSM;
Ii) or, energy storage submodule in described first brachium pontis adopts half-bridge submodule HBSM; Energy storage submodule simultaneously in described second brachium pontis adopts full-bridge submodule FBSM or class full-bridge submodule (SFBSM), isolates for direct fault current.
As further improved technical scheme of the present invention, described facies unit is three, is respectively first-phase unit, second-phase unit and third phase unit;
The other end of the first brachium pontis of described first-phase unit is connected with interchange terminal A, and the other end of the second brachium pontis of first-phase unit is also connected with interchange terminal A;
The other end of the first brachium pontis of described second-phase unit is connected with interchange terminal B, and the other end of the second brachium pontis of second-phase unit is also connected with interchange terminal B;
The other end of the first brachium pontis of described third phase unit is connected with interchange terminal A, and the other end of the second brachium pontis of third phase unit is also connected with interchange end points C.
As further improved technical scheme of the present invention, described first brachium pontis or the second brachium pontis also comprise at least one damping module DSM of series connection access; Described damping module DSM is made up of turn-off device, diode, resistor coupled in parallel; Described turn-off device diode reverse is in parallel, resistance R and turn-off device parallel connection;
The cathode directed of the diode of damping module DSM described in the first brachium pontis exchanges end points; The anode directed of the diode of damping module DSM described in the second brachium pontis exchanges end points.
As further improved technical scheme of the present invention, described damping module DSM also comprises the lightning arrester for the protection of turn-off device in parallel with a resistor.
As further improved technical scheme of the present invention, when facies unit normally runs, the turn-off device in described damping module DSM is in opening state always.
As further improved technical scheme of the present invention, when detecting that DC Line Fault occurs, all turn-off devices turn off at once.
In facies unit of the present invention, the energy storage submodule of a brachium pontis uses the full-bridge submodule (FBSM) with direct fault current isolating power or class full-bridge submodule (SFBSM), the energy storage submodule of another brachium pontis all adopts half-bridge submodule (HBSM), the modularization multi-level converter of relative employing half-bridge submodule, under optimal situation, the quantity of turn-off device only needs to add 1/4th and only has the switching loss of a brachium pontis to increase in facies unit, while having higher economy, still have DC line fault isolating power.
Beneficial effect of the present invention is:
(1) adopt in the brachium pontis of converter provided by the invention the situation that there is not half-bridge submodule and mix with the submodule with direct fault current isolating power, avoid the overvoltage problem that the submodule with direct fault current isolating power may occur when valve side earth fault;
(2), under optimal situation, the relatively complete modularization multi-level converter based on half-bridge submodule, the quantity of turn-off device only needs to add 1/4th, and only has the switching loss of a brachium pontis to increase during normal operation.
(3) adopt the first or second brachium pontis of converter facies unit provided by the invention all to adopt during half-bridge submodule and still there is DC Line Fault isolating power;
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of three-phase converter provided by the invention.
Fig. 2 a is one of half-bridge submodule (HBSM) structural representation.
Fig. 2 b is half-bridge submodule (HBSM) structural representation two.
Fig. 3 is full-bridge submodule (FBSM) structural representation.
Fig. 4 a is one of class full-bridge submodule (SFBSM) structural representation.
Fig. 4 b is class full-bridge submodule (SFBSM) structural representation two.
Fig. 5 is damping module (DSM) topology diagram.
Fig. 6 is the converter facies unit structural representation comprising damping module provided by the invention.
Embodiment
Below with reference to drawings and the specific embodiments, technical scheme of the present invention is described in detail.
Embodiment 1
This modularization multi-level converter, comprises at least one facies unit, and described facies unit comprises the first brachium pontis and the second brachium pontis; Described first brachium pontis one end is the first direct current end points P, and the other end is for connecting interchange end points; Described second brachium pontis one end is the second direct current end points N, and the other end is also for connecting interchange end points; Described first brachium pontis comprises at least two energy storage submodules and at least one reactor, and described energy storage submodule and reactor are in series; Described second brachium pontis comprises at least two energy storage submodules and at least one reactor, and described energy storage submodule and reactor are in series; Described first brachium pontis and the second brachium pontis adopt one of following two schemes: energy storage submodule i) in described first brachium pontis adopts full-bridge submodule FBSM or class full-bridge submodule SFBSM, isolates for direct fault current; Energy storage submodule simultaneously in described second brachium pontis adopts half-bridge submodule HBSM; Ii) or, energy storage submodule in described first brachium pontis adopts half-bridge submodule HBSM; Energy storage submodule simultaneously in described second brachium pontis adopts full-bridge submodule FBSM or class full-bridge submodule (SFBSM), isolates for direct fault current.
Preferably, described facies unit is three, is respectively first-phase unit, second-phase unit and third phase unit; The other end of the first brachium pontis of described first-phase unit is connected with interchange terminal A, and the other end of the second brachium pontis of first-phase unit is also connected with interchange terminal A; The other end of the first brachium pontis of described second-phase unit is connected with interchange terminal B, and the other end of the second brachium pontis of second-phase unit is also connected with interchange terminal B; The other end of the first brachium pontis of described third phase unit is connected with interchange terminal A, and the other end of the second brachium pontis of third phase unit is also connected with interchange end points C.Described first brachium pontis or the second brachium pontis also comprise at least one damping module DSM of series connection access; Described damping module DSM is made up of turn-off device, diode, resistor coupled in parallel; Described turn-off device diode reverse is in parallel, resistance R and turn-off device parallel connection; The cathode directed of the diode of damping module DSM described in the first brachium pontis exchanges end points; The anode directed of the diode of damping module DSM described in the second brachium pontis exchanges end points.Described damping module DSM also comprises the lightning arrester for the protection of turn-off device in parallel with a resistor.When facies unit normally runs, the turn-off device in described damping module DSM is in opening state always.When detecting that DC Line Fault occurs, all turn-off devices turn off at once.
Reactor in the present embodiment in the first brachium pontis and the second brachium pontis and energy storage submodule can any amount of proportioning join in any location strings, and both reactor can be 1,2,3, or more, can connect according to putting in order arbitrarily; Such as reactor can be connected on the either end of brachium pontis, or be connected on the two ends of brachium pontis, to be connected by reactor between even each energy storage submodule or using the part of reactor as submodule, reactor can any position in brachium pontis in a word, if to be connected in brachium pontis and the reactance value of equivalence to equal design load just passable, because reactor does not limit position, decrease the restriction of space layout to inverter design.
Further, with three facies units in the present embodiment, namely three-phase modular multilevel inverter is example, Fig. 1 is the structural representation of this modularization multi-level converter embodiment, comprise three facies units and be respectively first-phase unit, second-phase unit and third phase unit, corresponding interchange end points is respectively terminal A, B and C, and the first direct current end points short circuit of three facies units is end points P, and the second direct current end points short circuit of three facies units is end points N.
First-phase unit also comprises the first brachium pontis a1 and the second brachium pontis a2, multiple energy storage submodules that first brachium pontis a1 of first-phase unit comprises series connection are mutually respectively submodule a11, submodule a12 to submodule a1n, and the reactor La1 to connect with multiple energy storage submodule, reactor La1 one end is connected with the first direct current end points P, the other end is connected with the port x 1 of submodule a11, after submodule a11, submodule a12 are interconnected to the different port of submodule a1n, the port x 2 of submodule a1n with exchange terminal A and connect; Multiple energy storage submodules that second brachium pontis a2 of first-phase unit comprises series connection are mutually respectively submodule a21, submodule a22 to submodule a2n, and the reactor La2 to connect with multiple energy storage submodule, reactor La2 one end is connected with the second direct current end points N, the other end is connected with the port x 2 of submodule a2n, after submodule a21, submodule a22 are interconnected to the different port of submodule a2n, the port x 1 of submodule a11 with exchange terminal A and connect.Submodule a11, the submodule a12 of described first brachium pontis a1 are energy storage submodule to submodule a1n, employing full-bridge submodule as shown in Figure 3 or the class full-bridge submodule SFBSM as shown in accompanying drawing 4a or 4b, isolate for direct fault current, submodule a21, the submodule a22 of described second brachium pontis a2 are energy storage submodule to submodule a2n, adopt the half-bridge submodule HBSM as shown in accompanying drawing 2a or 2b; Or submodule a11, the submodule a12 of described first brachium pontis a1 are energy storage submodule to submodule a1n, adopt the half-bridge submodule HBSM as shown in accompanying drawing 2a or 2b, submodule a21, the submodule a22 of described second brachium pontis a2 are energy storage submodule to submodule a2n, employing full-bridge submodule as shown in Figure 3 or the class full-bridge submodule SFBSM as shown in accompanying drawing 4a or 4b, isolate for direct fault current.
Identical, second-phase unit also comprises the first brachium pontis b1 and the second brachium pontis b2, multiple energy storage submodules that first brachium pontis b1 of second-phase unit comprises series connection are mutually respectively submodule b11, submodule b12 to submodule b1n, and the reactor Lb1 to connect with multiple energy storage submodule, reactor Lb1 one end is connected with the first direct current end points P, the other end is connected with the port x 1 of submodule b11, after submodule b11, submodule b12 are interconnected to the different port of submodule b1n, the port x 2 of submodule b1n with exchange terminal B and connect; Multiple energy storage submodules that second brachium pontis b2 of second-phase unit comprises series connection are mutually respectively submodule b21, submodule b22 to submodule b2n, and the reactor Lb2 to connect with multiple energy storage submodule, reactor Lb2 one end is connected with the second direct current end points N, the other end is connected with the port x 2 of submodule b2n, after submodule b21, submodule b22 are interconnected to the different port of submodule b2n, the port x 1 of submodule b11 with exchange terminal B and connect.Submodule b11, the submodule b12 of described first brachium pontis b1 are energy storage submodule to submodule b1n, employing full-bridge submodule as shown in Figure 3 or the class full-bridge submodule SFBSM as shown in accompanying drawing 4a or 4b, isolate for direct fault current, submodule b21, the submodule b22 of described second brachium pontis b2 are energy storage submodule to submodule b2n, adopt the half-bridge submodule HBSM as shown in accompanying drawing 2a or 2b; Or submodule b11, the submodule b12 of described first brachium pontis b1 are energy storage submodule to submodule b1n, adopt the half-bridge submodule HBSM as shown in accompanying drawing 2a or 2b, submodule b21, the submodule b22 of described second brachium pontis b2 are energy storage submodule to submodule b2n, employing full-bridge submodule as shown in Figure 3 or the class full-bridge submodule SFBSM as shown in accompanying drawing 4a or 4b, isolate for direct fault current.
Identical, third phase unit also comprises the first brachium pontis c1 and the second brachium pontis c2, multiple energy storage submodules that first brachium pontis c1 of third phase unit comprises series connection are mutually respectively submodule c11, submodule c12 to submodule c1n, and the reactor Lc1 to connect with multiple energy storage submodule, reactor Lc1 one end is connected with the first direct current end points P, the other end is connected with the port x 1 of submodule c11, after submodule c11, submodule c12 are interconnected to the different port of submodule c1n, the port x 2 of submodule c1n with exchange end points C and connect; Multiple energy storage submodules that second brachium pontis c2 of third phase unit comprises series connection are mutually respectively submodule c21, submodule c22 to submodule c2n, and the reactor Lc2 to connect with multiple energy storage submodule, reactor Lc2 one end is connected with the second direct current end points N, the other end is connected with the port x 2 of submodule c2n, after submodule c21, submodule c22 are interconnected to the different port of submodule c2n, the port x 1 of submodule c11 with exchange end points C and connect.Submodule c11, the submodule c12 of described first brachium pontis c1 are energy storage submodule to submodule c1n, employing full-bridge submodule as shown in Figure 3 or the class full-bridge submodule SFBSM as shown in accompanying drawing 4a or 4b, isolate for direct fault current, submodule c21, the submodule c22 of described second brachium pontis c2 are energy storage submodule to submodule c2n, adopt the half-bridge submodule HBSM as shown in accompanying drawing 2a or 2b; Or submodule c11, the submodule c12 of described first brachium pontis c1 are energy storage submodule to submodule c1n, adopt the half-bridge submodule HBSM as shown in accompanying drawing 2a or 2b, submodule c21, the submodule c22 of described second brachium pontis c2 are energy storage submodule to submodule c2n, employing full-bridge submodule as shown in Figure 3 or the class full-bridge submodule SFBSM as shown in accompanying drawing 4a or 4b, isolate for direct fault current.
Shown in Fig. 2 a and Fig. 2 b is two kinds of half-bridge submodules with similar structures, described half-bridge submodule comprises turn-off device 11,13 and the energy-storage travelling wave tube C1 of band anti-paralleled diode, wherein, turn-off device 11 and diode 12 reverse parallel connection, turn-off device 13 and diode 14 reverse parallel connection; For turn-off device 11,13, it can adopt single gate-controlled switch device, as IGBT, IGCT, MOSFET or GTO etc. control device entirely, as provided all for IGBT in embodiment herein, the structure be made up of at least two gate-controlled switch devices in series also can be adopted.Described reverse parallel connection is that the anode of diode is connected with the negative electrode of turn-off device, and the negative electrode of described diode is connected with described turn-off device anode.
In fig. 2 a, when described turn-off device 11,13 is IGBT, the emitter of described turn-off device 11 is connected with the collector electrode of turn-off device 13, and this tie point is as the first end points X1 of energy storage submodule, the collector electrode of described turn-off device 11 connects the emitter of turn-off device 13 via energy-storage travelling wave tube C1; The emitter of turn-off device 13 is as the second end points X2 of energy storage submodule.
In figure 2b, when described turn-off device is IGBT, the emitter of turn-off device 13 is connected with the collector electrode of turn-off device 11, and this tie point is as the second end points X2 of energy storage submodule, the emitter of described turn-off device 11 connects the collector electrode of turn-off device 13 via energy-storage travelling wave tube C; The collector electrode of turn-off device 13 is as the first end points X1 of energy storage submodule.
Figure 3 shows that the structural representation of full-bridge submodule, described full-bridge submodule comprises turn-off device 21,23,25,27 and the energy-storage travelling wave tube C2 of band anti-paralleled diode, wherein, turn-off device 21 and diode 22 reverse parallel connection, turn-off device 23 and diode 24 inverse parallel, turn-off device 25 and diode 26 inverse parallel, turn-off device 27 and diode 28 reverse parallel connection; For turn-off device 21,23,25,27, it can adopt single gate-controlled switch device, as IGBT, IGCT, MOSFET or GTO etc. control device entirely, as provided all for IGBT in embodiment herein, the structure be made up of at least two gate-controlled switch devices in series also can be adopted.
In figure 3, the emitter of turn-off device 21 is connected with the collector electrode of turn-off device 23, and this tie point is as the first end points X1 of full-bridge submodule, and the collector electrode of described turn-off device 21 connects the emitter of turn-off device 23 via energy-storage travelling wave tube C2; The collector electrode of described turn-off device 21 also connects the collector electrode of turn-off device 27, and the emitter of described turn-off device 27 connects the collector electrode of turn-off device 25, and this tie point is as the second end points X2 of full-bridge submodule; The emitter of described turn-off device 25 is connected to the emitter of turn-off device 23.
Fig. 4 a and Fig. 4 b is depicted as the structural representation that two kinds have the class full-bridge submodule of class formation, described class full-bridge submodule comprises the turn-off device 31,33,35 of band anti-paralleled diode, diode 37 and energy-storage travelling wave tube C3, wherein, turn-off device 31 and diode 32 inverse parallel, turn-off device 33 and diode 34 reverse parallel connection, turn-off device 35 and diode 36 reverse parallel connection; For turn-off device 31,33,35, it can adopt single gate-controlled switch device, as IGBT, IGCT, MOSFET or GTO etc. control device entirely, as provided all for IGBT in embodiment herein, the structure be made up of at least two gate-controlled switch devices in series also can be adopted.
In class full-bridge submodule shown in Fig. 4 a, the emitter of turn-off device 31 is connected with the collector electrode of turn-off device 33, and this tie point is as the first end points X1 of class full-bridge submodule, the collector electrode of described turn-off device 31 connects the emitter of turn-off device 33 via energy-storage travelling wave tube C; The collector electrode of described turn-off device 31 also connects the negative electrode of diode 37, and the anode of described diode 37 connects the collector electrode of turn-off device 35, and this tie point is as the second end points X2 of class full-bridge submodule; The emitter of described turn-off device 35 is connected to the emitter of turn-off device 33.
In the class full-bridge submodule shown in Fig. 4 b, the emitter of turn-off device 35 connects the negative electrode of diode 37, and this tie point is as the first end points X1 of class full-bridge submodule, the collector electrode of described turn-off device 35 connects the anode of diode 37 via energy-storage travelling wave tube C3; The collector electrode of described turn-off device 35 also connects the collector electrode of turn-off device 33, the emitter of described turn-off device 33 connects the collector electrode of turn-off device 31, and this tie point is as the second end points X2 of class full-bridge submodule, the emitter of described turn-off device 31 is connected to the anode of diode 37.
Figure 5 shows that damping module DSM topology diagram, by turn-off device S1, compose in parallel with the antiparallel diode D1 of S1, resistance R and lightning arrester M, the negative electrode of diode D1 is the first connection end point X1 of damping module DSM, and the anode of diode D1 is the second connection end point X2 of damping module DSM.
Figure 6 shows that the converter facies unit structural representation comprising damping module, first brachium pontis comprises the reactance L1 of series connection, a damping module DSM and multiple class full-bridge submodule SFBSM1, one end of reactance L1 connects the first direct current end points P, the other end of reactance L1 connects the first port X1 of damping module DSM, damping module DSM connects successively with multiple class full-bridge submodule SFBSM1, namely the second port x 2 of last module is connected with the first port X1 of a rear module, and second port x 2 of last class full-bridge submodule SFBSM1 is connected with interchange terminal A; Second brachium pontis comprises the reactance L2 of series connection, a damping module DSM ' and multiple half-bridge submodule HBSM1, one end of reactance L2 connects the second direct current end points N, the other end of reactance L2 connects second port x 2 of damping module DSM, damping module DSM connects successively with multiple half-bridge submodule HBSM1, namely the second port x 2 of last module is connected with the first port X1 of a rear module, and the first port X1 of last half-bridge submodule HBSM1 is connected with interchange terminal A; Second direct current end points N is also connected with the earth, and such second direct current end points P only needs an overhead wire/cable can be connected with other end converter.
The converter facies unit comprising damping module as shown in Figure 6, when DC line generation earth fault, switching devices all in locking damping module DSM, class full-bridge submodule SFBSM1 and damping module DSM ', the electric capacity C of class full-bridge submodule SFBSM1 provides reverse voltage to suppress bridge arm current to be zero, the damped module consumption of an energy part in the process in fault loop, remainder is absorbed by the electric capacity C in class full-bridge submodule SFBSM1.
It should be noted that, the converter facies unit comprising damping module as shown in Figure 6, any one class full-bridge submodule SFBSM1 can be the class full-bridge submodule SFBSM2 shown in full-bridge submodule or Fig. 4 b as shown in Figure 3; In Fig. 6, the first brachium pontis and the second brachium pontis only configure a damping module DSM, and also configurable multiple damping module DSM completes identical damping function.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (6)
1. a modularization multi-level converter, comprises at least one facies unit, and described facies unit comprises the first brachium pontis and the second brachium pontis;
Described first brachium pontis one end is the first direct current end points P, and the other end is for connecting interchange end points;
Described second brachium pontis one end is the second direct current end points N, and the other end is also for connecting interchange end points;
Described first brachium pontis comprises at least two energy storage submodules and at least one reactor, and described energy storage submodule and reactor are in series;
Described second brachium pontis comprises at least two energy storage submodules and at least one reactor, and described energy storage submodule and reactor are in series;
It is characterized in that described first brachium pontis and the second brachium pontis adopt one of following two schemes:
I) the energy storage submodule in described first brachium pontis adopts full-bridge submodule FBSM or class full-bridge submodule SFBSM, isolates for direct fault current; Energy storage submodule simultaneously in described second brachium pontis adopts half-bridge submodule HBSM;
Ii) or, energy storage submodule in described first brachium pontis adopts half-bridge submodule HBSM; Energy storage submodule simultaneously in described second brachium pontis adopts full-bridge submodule FBSM or class full-bridge submodule (SFBSM), isolates for direct fault current.
2. modularization multi-level converter as claimed in claim 1, is characterized in that:
Described facies unit is three, is respectively first-phase unit, second-phase unit and third phase unit;
The other end of the first brachium pontis of described first-phase unit is connected with interchange terminal A, and the other end of the second brachium pontis of first-phase unit is also connected with interchange terminal A;
The other end of the first brachium pontis of described second-phase unit is connected with interchange terminal B, and the other end of the second brachium pontis of second-phase unit is also connected with interchange terminal B;
The other end of the first brachium pontis of described third phase unit is connected with interchange terminal A, and the other end of the second brachium pontis of third phase unit is also connected with interchange end points C.
3. modularization multi-level converter as claimed in claim 1 or 2, is characterized in that: described first brachium pontis or the second brachium pontis also comprise at least one damping module DSM of series connection access; Described damping module DSM is made up of turn-off device, diode, resistor coupled in parallel; Described turn-off device diode reverse is in parallel, resistance R and turn-off device parallel connection;
The cathode directed of the diode of damping module DSM described in the first brachium pontis exchanges end points; The anode directed of the diode of damping module DSM described in the second brachium pontis exchanges end points.
4. modularization multi-level converter as claimed in claim 3, is characterized in that: described damping module DSM also comprises the lightning arrester for the protection of turn-off device in parallel with a resistor.
5. modularization multi-level converter as claimed in claim 3, it is characterized in that: when facies unit normally runs, the turn-off device in described damping module DSM is in opening state always.
6. modularization multi-level converter as claimed in claim 3, it is characterized in that: when detecting that DC Line Fault occurs, all turn-off devices turn off at once.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510351437.4A CN104901570B (en) | 2015-06-23 | 2015-06-23 | Modularization multi-level converter |
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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 |
| CN108233689A (en) * | 2018-01-12 | 2018-06-29 | 南京南瑞继保电气有限公司 | A kind of power conversion unit 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 |
| CN110417290A (en) * | 2019-07-23 | 2019-11-05 | 国网江苏省电力有限公司扬州供电分公司 | A kind of novel modularized multilevel converter submodule topological circuit and its control method |
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| CN108233689A (en) * | 2018-01-12 | 2018-06-29 | 南京南瑞继保电气有限公司 | A kind of power conversion unit 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 |
| CN110417290A (en) * | 2019-07-23 | 2019-11-05 | 国网江苏省电力有限公司扬州供电分公司 | A kind of novel modularized multilevel converter submodule topological circuit and its control method |
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