CN103326608B - One seed module, facies unit, voltage-source type multilevel converter and control method - Google Patents
One seed module, facies unit, voltage-source type multilevel converter and control method Download PDFInfo
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- CN103326608B CN103326608B CN201310222489.2A CN201310222489A CN103326608B CN 103326608 B CN103326608 B CN 103326608B CN 201310222489 A CN201310222489 A CN 201310222489A CN 103326608 B CN103326608 B CN 103326608B
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Abstract
Disclosure one seed module, including the first branch road parallel with one another and the second branch road；First branch road comprises the energy-storage travelling wave tube and at least one turn-off device that are serially connected, has at least a turn-off device forward to be connected in the first branch road；Second branch road includes at least one charging circuit and at least two turn-off device, all turn-off devices are serially connected, and at least one turn-off device and other turn-off device differential concatenation, and charging circuit is in parallel with turn-off device, and make the turn-off device of any one differential concatenation all between the two ends of some charging circuit.This structure differential concatenation by turn-off device, can suppress when DC Line Fault locking inverter even to stop AC system to inject fault current to DC network.Invention additionally discloses the control method of a kind of aforementioned submodule, and the facies unit being made up of this submodule and control method, and the voltage-source type multilevel converter being made up of described facies unit and control method.
Description
Technical field
The invention belongs to field of power electronics, particularly to a kind of voltage-source type multilevel converter and composition its submodule, facies unit structure and control method.
Background technology
Modularization multi-level converter is a kind of novel inverter suitable in high pressure applications received much concern in recent years.It adopts the mode of a sub module cascade, by controlling the state of each submodule respectively, it is possible to make the alternating voltage that inverter exports approach sine wave, thus the harmonic content reduced in output voltage.Its appearance solves the series average-voltage problem that two level voltage source inverters exist, and has broad application prospects.
" distributed energy storage and the converter circuit " of MarquardtRainer is referred to a kind of modularization multi-level converter (MMC) (public announcement of a patent application number: DE10103031A) the earliest, the submodule of this inverter adopts half-bridge and capacitor to compose in parallel, and the output port at submodule can pass through to control to produce capacitance voltage or two kinds of level of 0 voltage.2010, Siemens Company a success for the flexible DC power transmission engineering TransBay engineering adopting this topological structure that beats the world undertaken the construction of puts into operation, it was demonstrated that the engineer applied feasibility of this inverter topological structure.
This structure is modified by ABB AB on the basis of modular multi-level converter topological structure, propose a kind of cascade two level blockization many level topological structure (public announcement of a patent application number: US20100328977A1), with above-mentioned modularization multi-level converter, this inverter is distinctive in that the connected mode of submodule is contrary.
Above two modularization multi-level converter has the disadvantage that, when DC network breaks down, AC network can provide fault current by the diode of submodule to trouble point, thus causing DC side to cross stream.
ALSTOM company it is also proposed a kind of novel topological structure (public announcement of a patent application number: US20120113699A1), it is called bridge arm switching multi-level converter (AAMC), each brachium pontis of this inverter is constituted controllable voltage source by N number of full-bridge sub module cascade, and M IGBT switch series connection is as brachium pontis switching switch.The cascade full-bridge submodule of upper and lower bridge arm is put into AC network by M the IGBT switch connected by this inverter in turn, when DC network breaks down, inverter is switched to the STATCOM method of operation and block AC network and the path of fault current is provided to trouble point, DC side overcurrent will not be caused.But this converter Control method is more complicated, need engineering verification.
Summary of the invention
The purpose of the present invention, it is in that to provide a seed module, facies unit, voltage-source type multilevel converter and control method, it is by the differential concatenation of turn-off device in submodule, can suppress when DC Line Fault locking inverter even to stop AC system to inject fault current to DC network.
In order to reach above-mentioned purpose, the technical solution used in the present invention is:
One seed module, including the first branch road parallel with one another and the second branch road；
First branch road comprises the energy-storage travelling wave tube and at least one first turn-off device that are serially connected, and each first equal inverse parallel of turn-off device has diode, and has at least a first turn-off device forward to be connected in the first branch road；When the first turn-off device has at least two, and when at least one first turn-off device and other the first turn-off device differential concatenation, first branch road also includes at least one charging circuit, this charging circuit and the first turn-off device are in parallel, and make the first turn-off device of any one differential concatenation all between the two ends of some charging circuit；And the annexation of energy-storage travelling wave tube and the first turn-off device can only have following 4 kinds of situations: the positive pole of energy-storage travelling wave tube connects the positive pole of the first turn-off device of forward series connection, the positive pole of energy-storage travelling wave tube connects the negative pole of the first turn-off device of differential concatenation, the negative pole of energy-storage travelling wave tube connects the negative pole of the first turn-off device that forward connects or the positive pole of the first turn-off device of the negative pole connection differential concatenation of energy-storage travelling wave tube；
Second branch road includes at least one charging circuit and at least two the second turn-off device, each second equal inverse parallel of turn-off device has diode, all second turn-off devices are serially connected, and at least one second turn-off device and other the second turn-off device differential concatenation, and charging circuit and the second turn-off device are in parallel, and make the second turn-off device of any one differential concatenation all between the two ends of some charging circuit.
Above-mentioned charging circuit adopts any one in following six kinds of structures: only with normally closed node；Only with charging resistor；Normally closed node is connected with charging resistor；Diode reverse is connected with normally closed node；Diode reverse is connected with charging resistor；Connect with normally closed node, charging resistor three again after diode reverse.
The control method of a kind of submodule as above, controls submodule and is operated in following three kinds of states: conducting state, controls all first turn-off device conductings in the first branch road, and all second turn-off devices controlled in the second branch road turn off；Off state, all first turn-off devices controlled in the first branch road turn off, and control all second turn-off device conductings in two branch roads；Blocking, controls all first turn-off devices in the first branch road and all second turn-off devices in the second branch road are turned off.
When being in series with normally closed node in above-mentioned charging circuit, first control submodule pulls open this normally closed node before being operated on or off state.
A kind of facies unit, including upper brachium pontis and lower brachium pontis, described upper and lower brachium pontis all includes at least two being serially connected submodule as claimed in claim 1 or 2 and at least one reactor, all submodules in described same brachium pontis connect in the same direction, and submodule closure in upper and lower brachium pontis is contrary, and one end of upper and lower brachium pontis is respectively as first and second direct current end points of this facies unit, in order to access in DC network, and the mutual short circuit of the other end of upper and lower brachium pontis is as the exchange end points of this facies unit, in order in incoming transport network.
A kind of facies unit, the submodule comprised in described upper and lower brachium pontis and the quantity of reactor are identical or different.
The control method of a kind of facies unit as above, each submodule controlled in facies unit is operated in following three kinds of states: conducting state, controls all first turn-off device conductings in the first branch road, and all second turn-off devices controlled in the second branch road turn off；Off state, all first turn-off devices controlled in the first branch road turn off, and control all second turn-off device conductings in two branch roads；Blocking, controls all first turn-off devices in the first branch road and all second turn-off devices in the second branch road are turned off.
When certain submodule charging circuit in above-mentioned facies unit is in series with normally closed node, control before this submodule is operated on or off state, first to pull open this normally closed node.
A kind of voltage-source type multilevel converter, comprises at least one facies unit as above.
A kind of such as the control method of above-mentioned voltage-source type multilevel converter, the each submodule controlling to form in the facies unit of this inverter is operated in following three kinds of states: conducting state, controlling all first turn-off device conductings in the first branch road, all second turn-off devices controlled in the second branch road turn off；Off state, all first turn-off devices controlled in the first branch road turn off, and control all second turn-off device conductings in two branch roads；Blocking, controls all first turn-off devices in the first branch road and all second turn-off devices in the second branch road are turned off.
After adopting such scheme, the invention have the benefit that
(1) during DC network fault, it is possible to suppress even to stop AC network to provide fault current to trouble point by turning off the turn-off device in all submodules；
(2) when charging circuit comprises charging resistor, it is possible to cancel the charging resistor of inverter AC.
Accompanying drawing explanation
Fig. 1 is the first embodiment schematic diagram of Neutron module of the present invention；
Fig. 2 is the charging circuit schematic diagram of Neutron module of the present invention；
Fig. 3 is the second embodiment schematic diagram of Neutron module of the present invention；
Fig. 4 is the 3rd embodiment schematic diagram of Neutron module of the present invention；
Fig. 5 is the 4th embodiment schematic diagram of Neutron module of the present invention；
Fig. 6 is the control method schematic diagram of submodule shown in Fig. 1；
Fig. 7 is the connection diagram of voltage-source type multilevel converter in the present invention.
Detailed description of the invention
The present invention provides a kind of submodule for forming voltage-source type multilevel converter, including the first branch road parallel with one another and the second branch road, article two, two of branch road interface are as two exit points, for connecting external circuit, wherein, first branch road comprises the energy-storage travelling wave tube and at least one turn-off device that are serially connected, the equal inverse parallel of each turn-off device has diode, when turn-off device has at least two, at least one turn-off device and other turn-off device differential concatenation, and now the first branch road also includes at least one charging circuit, this charging circuit is in parallel with turn-off device, the principle connected is to ensure that the turn-off device making any one differential concatenation is all between the two ends of some charging circuit；And energy-storage travelling wave tube can only have following 4 kinds of situations with the annexation of turn-off device: the positive pole of energy-storage travelling wave tube is connected the positive pole of the turn-off device of forward series connection, the positive pole of energy-storage travelling wave tube connects the negative pole of the turn-off device of differential concatenation, the negative pole of energy-storage travelling wave tube connects the negative pole of the turn-off device that forward connects or the positive pole of the turn-off device of the negative pole connection differential concatenation of energy-storage travelling wave tube；Second branch road includes at least one charging circuit and at least two turn-off device, the equal inverse parallel of each turn-off device has diode, all turn-off devices are serially connected, and at least one turn-off device and other turn-off device differential concatenation, and charging circuit is in parallel with turn-off device, the principle connected is to ensure that the turn-off device making any one differential concatenation is all between the two ends of some charging circuit, is described in detail below in conjunction with specific embodiment.
When described turn-off device adopts IGBT, described just extremely its colelctor electrode, described negative pole is its emitter stage；When described turn-off device adopts IGCT or GTO, described just extremely its anode, described negative pole is its negative electrode；When described turn-off device adopts MOSFET, described just extremely its drain electrode, described negative pole is its source electrode.
First as shown in Figure 2, it it is a kind of way of realization of charging circuit 19, two end points X3 of described charging circuit 19, can only with normally closed node 191 or charging resistor 192 between X4, normally closed node 191 can also be adopted to be in series with charging resistor 192, more can adopt in diode 193 and normally closed node 191 and charging resistor 192 cascaded structure of any one or two kinds of devices, namely have 6 kinds and realize structure, Fig. 2 gives the structure that three kinds of devices all adopt, wherein diode 193 needs differential concatenation, it should be noted that, which kind of combination no matter is adopted to realize structure, each device is for being connected in series, therefore its position relationship is not construed as limiting, shown in Fig. 2, structure is only illustration.The effect of normally closed node is by pulling open this normally closed node time properly functioning, enables the submodule of locking to stop AC network cannot provide fault current to trouble point；The effect of charging resistor is the charging current in restriction inverter charging process；Acting as in charging circuit limit charging current in parallel with turn-off device direction of diode.Function as required can be composed in series charging circuit by the various combination of the normally closed node of employing, charging resistor and diode.
Will be given below the present invention and several circuit that realize of submodule are provided, and be described in detail.
As shown in Figure 1, it is that the one of Neutron module of the present invention realizes circuit, wherein, first branch road includes turn-off device 11, diode 12 and the capacitor 10 as energy-storage travelling wave tube, and wherein, diode 12 inverse parallel is at the two ends of turn-off device 11, and turn-off device 11 and capacitor 10 are series relationship, and the positive pole of turn-off device 11 connects the positive pole of capacitor, the negative pole of turn-off device 11 connects the exit point X1 of this submodule, and the negative pole of capacitor 10 connects the exit point X2 of this submodule；Second branch road includes turn-off device 13,15, diode 14,16 and charging circuit 19, wherein, diode 14,16 inverse parallel respectively is at the two ends of turn-off device 13,15, turn-off device 13 forward connects, and turn-off device 15 Opposite direction connection, " forward ", " reversely " herein is to be as the criterion with the direction of capacitor 10；Charging circuit 19 is connected in parallel on the two ends of turn-off device 15, for charging for other submodule, and the structure of charging circuit 19 by the agency of above, it is not described in detail in this.
Coordinating Fig. 1 structure, the present invention gives the control method of this submodule, and as shown in Figure 6, the controlled system module of described control method is operated in three kinds of duties: conducting state, off state and blocking.
Conducting state: turn-off device 11 turns on, turn-off device 13,15 turns off, capacitor 10 is by diode 12(such as Fig. 6 (a)) or turn-off device 11(such as Fig. 6 (d)) access between two output ports X1, X2 of submodule, now the voltage between X1, X2 is the voltage of capacitor 10, electric current can flow into from X1, X2 flows out, it is also possible to flow into from X2, X1 flows out；
Off state: turn-off device 11 turns off, turn-off device 13,15 turns on, capacitor 10 is bypassed, and between output port X1, X2, the voltage of output is 0, and electric current can flow into from X1, pass sequentially through turn-off device 13 and diode 16, flowed out by X2 again, see Fig. 6 (b), it is possible to flow into from X2, sequentially pass through turn-off device 15 and diode 14, then flowed out by X1；
First blocking: if being in series with normally closed node 191 in charging circuit 19, then need when locking to pull open this normally closed node 191；Turn-off device 11,13,15 is turned off, and electric current can flow into from X1, passes sequentially through diode 12 and capacitor 10, then is flowed out by X2, sees shown in Fig. 6 (c)；In Fig. 6 (f) Suo Shi, there are two kinds of situations: if charging circuit 19 is in series with normally closed node, owing to normally closed node pulls open, electric current can not flow into from X2, X1 flow out, and if normally closed node of not connecting in charging circuit 19, then now no matter this charging circuit is only with charging resistor 192, or adopt charging resistor 192 to connect with diode 193, electric current all can flow into from X2, sequentially passes through charging circuit 19 and diode 14, then is flowed out by X1.
As shown in Figure 3, it is that the present invention provides the second of submodule to implement structure, its component number adopted and kind are identical with structure shown in Fig. 1: the first branch road includes turn-off device 21, diode 22 and capacitor 20, second branch road includes turn-off device 23,25, diode 24,26 and charging circuit 19, different from structure shown in Fig. 1 are in that: charging circuit 19 is connected in parallel on the two ends of the second branch road；The control method of this enforcement structure is identical with Fig. 1 structure, repeats no more.
Being the third enforcement structure of submodule of the present invention shown in Fig. 4, the second branch road includes turn-off device 33,35, diode 34,36 and charging circuit 19, and the annexation of this second branch road is identical with the second branch road annexation in Fig. 1, no longer describes in detail；First branch road includes turn-off device 31, diode 32 and capacitor 33, wherein, diode 32 inverse parallel is at the two ends of turn-off device 31, the exit point X1 of the positive pole connexon module of capacitor 30, negative pole connects the negative pole of turn-off device 31, and turn-off device 31 positive pole connect exit point X2, namely turn-off device 31 be differential concatenation in circuit.The control method that this kind implements structure is identical with Fig. 1 structure, and when submodule is in the conduction state, turn-off device 31 turns on, and turn-off device 33,35 turns off；When submodule is off state, turn-off device 31 turns off, and turn-off device 33,35 turns on；When submodule is in blocking, turn-off device 31,33,35 is both off.Concrete current direction is not described in detail in this.
Being the 4th kind of enforcement structure of submodule of the present invention shown in Fig. 5, the second branch road includes turn-off device 45,47, diode 46,48 and charging circuit 19, and the annexation of this second branch road is identical with the second branch road annexation in Fig. 1, no longer describes in detail；First branch road includes turn-off device 41,43, diode 42,44, charging circuit 19 and capacitor 40, diode 42,44 inverse parallel respectively is at the two ends of turn-off device 41,43, turn-off device 43,41 and capacitor 40 are sequentially connected in series, and turn-off device 43 differential concatenation, turn-off device 41 forward is connected, and charging circuit 19 is in parallel with the turn-off device 43 of differential concatenation.The control method of this enforcement structure is identical with control method principle shown in Fig. 6, there are three kinds of duties: during conducting state, all turn-off devices conducting in first branch road, all turn-off devices in second branch road turn off, during off state, all turn-off devices in first branch road turn off, all turn-off devices conducting in second branch road, during blocking, the all turn-off devices connected in submodule are both off, and before controlling entrance blocking, if charging circuit is in series with normally closed node, need first to be pulled open by normally closed node, now electric current can not flow into from output port X1, output port X2 flows out, can not flow into from X2, X1 flows out.
After adopting aforementioned structure, when submodule is uncharged, normally closed node closes, and can be charged for other submodule by charging circuit and diode；Before unlocking after submodule charging complete (before being namely operated on or off state), pull open normally closed node owing to submodule is charged by corresponding control circuit.
As shown in Figure 7, the circuit diagram of the facies unit being made up of aforementioned submodule, wherein, described facies unit includes brachium pontis 3 and lower brachium pontis 4, described upper and lower brachium pontis all includes at least two submodule 1(SM being serially connected) and at least one reactor 2, and the submodule 1 comprised in upper and lower brachium pontis can be identical with the quantity of reactor 2, it is also possible to different, the particular circuit configurations of each submodule 1 can be identical, it is also possible to different；In same brachium pontis (upper brachium pontis 3 or lower brachium pontis 4), all of submodule 1 connects in the same direction, and the closure of the submodule 1 in upper and lower brachium pontis is contrary；One end of upper brachium pontis 3 is as the first direct current end points 6 of described facies unit, in order to access in DC network, one end of lower brachium pontis 4 is as the second direct current end points 7 of described facies unit, in order to access in DC network, and the other end of upper brachium pontis 3, lower brachium pontis 4 links together, collectively as the exchange end points 5 of described facies unit, in order in incoming transport network.It should be noted that, for upper brachium pontis 3 or lower brachium pontis 4, described submodule 1 is also unrestricted with the series position of reactor 2, and many sub-reactors can be regarded as due to a reactor and be composed in series, therefore the number of described reactor is not limited as, as long as the reactance total value in certain brachium pontis reaches the requirement that this brachium pontis is corresponding.
The present invention also provides for a kind of voltage-source type multilevel converter, and including the facies unit shown at least one Fig. 7, the number of described facies unit can determine according to the exchange end points number of AC system.Described inverter suppresses by turning off the turn-off device in all submodules or stops AC network to provide fault current to the trouble point of DC network.When DC network generation earth fault, such as, in Fig. 7 during the first direct current end points 6 ground connection, make all submodules 1 be in blocking by locking inverter, due to electric current cannot flow into from the output port X2 of submodule 1, X1 flow out, therefore AC network cannot provide fault current to trouble point.
Above example is only the technological thought that the present invention is described, it is impossible to limits protection scope of the present invention, every technological thought proposed according to the present invention, any change done on technical scheme basis with this, each falls within scope.
Claims (5)
1. the control method of a seed module, described submodule includes the first branch road parallel with one another and the second branch road；
First branch road comprises the energy-storage travelling wave tube and at least one first turn-off device that are serially connected, and each first equal inverse parallel of turn-off device has diode, and has at least a first turn-off device forward to be connected in the first branch road；When the first turn-off device has at least two, and when at least one first turn-off device and other the first turn-off device differential concatenation, first branch road also includes at least one charging circuit, this charging circuit and the first turn-off device are in parallel, and make the first turn-off device of any one differential concatenation all between the two ends of some charging circuit；And the annexation of energy-storage travelling wave tube and the first turn-off device can only have following 4 kinds of situations: the positive pole of energy-storage travelling wave tube connects the positive pole of the first turn-off device of forward series connection, the positive pole of energy-storage travelling wave tube connects the negative pole of the first turn-off device of differential concatenation, the negative pole of energy-storage travelling wave tube connects the negative pole of the first turn-off device that forward connects or the positive pole of the first turn-off device of the negative pole connection differential concatenation of energy-storage travelling wave tube；
Second branch road includes at least one charging circuit and at least two the second turn-off device, each second equal inverse parallel of turn-off device has diode, all second turn-off devices are serially connected, and at least one second turn-off device and other the second turn-off device differential concatenation, and charging circuit and the second turn-off device are in parallel, and make the second turn-off device of any one differential concatenation all between the two ends of some charging circuit；
It is characterized in that controlling submodule is operated in following three kinds of states: conducting state, control all first turn-off device conductings in the first branch road, all second turn-off devices controlled in the second branch road turn off；Off state, all first turn-off devices controlled in the first branch road turn off, and control all second turn-off device conductings in two branch roads；Blocking, controls all first turn-off devices in the first branch road and all second turn-off devices in the second branch road are turned off.
2. the control method of a seed module as claimed in claim 1, it is characterised in that: when being in series with normally closed node in described charging circuit, first control submodule pulls open this normally closed node before being operated on or off state.
3. the control method of a facies unit, described facies unit includes brachium pontis and lower brachium pontis, described upper brachium pontis and lower brachium pontis all include at least two submodule and at least one reactor that are serially connected, all submodules in described upper brachium pontis and lower brachium pontis connect in the same direction, and submodule closure in upper brachium pontis and lower brachium pontis is contrary, and one end of upper brachium pontis and lower brachium pontis is respectively as the first of this facies unit, two direct current end points, in order to access in DC network, and the mutual short circuit of the other end of upper brachium pontis and lower brachium pontis is as the end points that exchanges of this facies unit, in order in incoming transport network；
Described submodule includes the first branch road parallel with one another and the second branch road；
First branch road comprises the energy-storage travelling wave tube and at least one first turn-off device that are serially connected, and each first equal inverse parallel of turn-off device has diode, and has at least a first turn-off device forward to be connected in the first branch road；When the first turn-off device has at least two, and when at least one first turn-off device and other the first turn-off device differential concatenation, first branch road also includes at least one charging circuit, this charging circuit and the first turn-off device are in parallel, and make the first turn-off device of any one differential concatenation all between the two ends of some charging circuit；And the annexation of energy-storage travelling wave tube and the first turn-off device can only have following 4 kinds of situations: the positive pole of energy-storage travelling wave tube connects the positive pole of the first turn-off device of forward series connection, the positive pole of energy-storage travelling wave tube connects the negative pole of the first turn-off device of differential concatenation, the negative pole of energy-storage travelling wave tube connects the negative pole of the first turn-off device that forward connects or the positive pole of the first turn-off device of the negative pole connection differential concatenation of energy-storage travelling wave tube；
Second branch road includes at least one charging circuit and at least two the second turn-off device, each second equal inverse parallel of turn-off device has diode, all second turn-off devices are serially connected, and at least one second turn-off device and other the second turn-off device differential concatenation, and charging circuit and the second turn-off device are in parallel, and make the second turn-off device of any one differential concatenation all between the two ends of some charging circuit；
It is characterized in that each submodule controlled in facies unit is operated in following three kinds of states: conducting state, control all first turn-off device conductings in the first branch road, all second turn-off devices controlled in the second branch road turn off；Off state, all first turn-off devices controlled in the first branch road turn off, and control all second turn-off device conductings in two branch roads；Blocking, controls all first turn-off devices in the first branch road and all second turn-off devices in the second branch road are turned off.
4. the control method of a kind of facies unit as claimed in claim 3, it is characterised in that: when certain the submodule charging circuit in described facies unit is in series with normally closed node, control before this submodule is operated on or off state, first to pull open this normally closed node.
5. the control method of a voltage-source type multilevel converter, described voltage-source type multilevel converter comprises at least one facies unit, described facies unit includes brachium pontis and lower brachium pontis, described upper brachium pontis and lower brachium pontis all include at least two submodule and at least one reactor that are serially connected, all submodules in described upper brachium pontis and lower brachium pontis connect in the same direction, and submodule closure in upper brachium pontis and lower brachium pontis is contrary, and one end of upper brachium pontis and lower brachium pontis is respectively as the first of this facies unit, two direct current end points, in order to access in DC network, and the mutual short circuit of the other end of upper brachium pontis and lower brachium pontis is as the end points that exchanges of this facies unit, in order in incoming transport network；
Described submodule includes the first branch road parallel with one another and the second branch road；
First branch road comprises the energy-storage travelling wave tube and at least one first turn-off device that are serially connected, and each first equal inverse parallel of turn-off device has diode, and has at least a first turn-off device forward to be connected in the first branch road；When the first turn-off device has at least two, and when at least one first turn-off device and other the first turn-off device differential concatenation, first branch road also includes at least one charging circuit, this charging circuit and the first turn-off device are in parallel, and make the first turn-off device of any one differential concatenation all between the two ends of some charging circuit；And the annexation of energy-storage travelling wave tube and the first turn-off device can only have following 4 kinds of situations: the positive pole of energy-storage travelling wave tube connects the positive pole of the first turn-off device of forward series connection, the positive pole of energy-storage travelling wave tube connects the negative pole of the first turn-off device of differential concatenation, the negative pole of energy-storage travelling wave tube connects the negative pole of the first turn-off device that forward connects or the positive pole of the first turn-off device of the negative pole connection differential concatenation of energy-storage travelling wave tube；
Second branch road includes at least one charging circuit and at least two the second turn-off device, each second equal inverse parallel of turn-off device has diode, all second turn-off devices are serially connected, and at least one second turn-off device and other the second turn-off device differential concatenation, and charging circuit and the second turn-off device are in parallel, and make the second turn-off device of any one differential concatenation all between the two ends of some charging circuit；
It is characterized in that each submodule controlling to form in the facies unit of this inverter is operated in following three kinds of states: conducting state, control all first turn-off device conductings in the first branch road, all second turn-off devices controlled in the second branch road turn off；Off state, all first turn-off devices controlled in the first branch road turn off, and control all second turn-off device conductings in two branch roads；Blocking, controls all first turn-off devices in the first branch road and all second turn-off devices in the second branch road are turned off.
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|---|---|---|---|---|
| CN104052026B (en) * | 2014-05-29 | 2016-05-25 | 华中科技大学 | For submodule topology and the application thereof of modularization multi-level converter |
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