CN103326608A - Sub module, phase unit, voltage source type multi-level current converter and control methods - Google Patents
Sub module, phase unit, voltage source type multi-level current converter and control methods Download PDFInfo
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- CN103326608A CN103326608A CN2013102224892A CN201310222489A CN103326608A CN 103326608 A CN103326608 A CN 103326608A CN 2013102224892 A CN2013102224892 A CN 2013102224892A CN 201310222489 A CN201310222489 A CN 201310222489A CN 103326608 A CN103326608 A CN 103326608A
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Abstract
The invention discloses a sub module which comprises a first sub circuit and a second sub circuit which are connected in parallel, the first sub circuit comprises an energy storage element and at least one turning-off component which are connected in series, and the turning-off component is forwardly connected in the first sub circuit in series. The second sub circuit comprises at least one charging circuit and at least two turning-off components, the turning-off components all can be connected in series, and at least one turning-off component is backwardly connected with other turning-off components in series. The charging circuit is connected with the turning-off components in parallel, and any one of the turning-off components which are backwardly connected in series is arranged between the two ends of the charging circuit. Through the backward series connection of the turning-off components, when direct currents fail and a current converter is closed, an alternating current system can be restrained or even stopped from injecting failure currents to a direct current system. The invention further discloses a control method of the sub module, a phase unit formed by the sub modules and a control method thereof, and a voltage source type multi-level current converter formed by the phase units and a control method thereof.
Description
Technical field
The invention belongs to field of power electronics, particularly a kind of voltage-source type multilevel converter and form its submodule, facies unit structure and control method.
Background technology
Modularization multi-level converter is a kind of novel converter that is applicable to high pressure applications that received much concern in recent years.It adopts the mode of a sub-module-cascade, by controlling respectively the state of each submodule, can make the alternating voltage of converter output approach sine wave, thereby reduce the harmonic content in the output voltage.Its appearance has solved the series average-voltage problem that two level voltage source converters exist, and has broad application prospects.
" distributed energy storage and converter circuit " of Marquardt Rainer mentioned a kind of modularization multi-level converter (MMC) (public announcement of a patent application number: DE10103031A) the earliest, the submodule of this converter adopts half-bridge and Parallel-connected Capacitor to form, can be by control generation capacitance voltage or two kinds of level of 0 voltage at the output port of submodule.2010, a success of the flexible DC power transmission engineering Trans Bay engineering of this topological structure of employing that beats the world of being undertaken the construction of by Siemens Company put into operation, and has proved the engineering application feasibility of this converter topological structure.
ABB AB revises this structure on the basis of modularization multi-level converter topological structure, (public announcement of a patent application number: US20100328977A1), this converter is that with the difference of above-mentioned modularization multi-level converter the connected mode of submodule is opposite to have proposed a kind of cascade two level modular multilevel topological structures.
The shortcoming that above-mentioned two kinds of modularization multi-level converters exist is, AC network can provide fault current to the fault point by the diode of submodule when DC network broke down, thereby caused the DC side overcurrent.
ALSTOM company has also proposed (the public announcement of a patent application number: US20120113699A1) of a kind of novel topological structure, be called bridge arm switching multi-level converter (AAMC), each brachium pontis of this converter consists of controllable voltage source by the cascade of N full-bridge submodule, and M IGBT switch series connection is as the brachium pontis diverter switch.This converter drops into AC network with the cascade full-bridge submodule of upper and lower bridge arm in turn by M IGBT switch of series connection, when DC network breaks down, converter is switched to the STATCOM operational mode and block AC network provides path from fault current to the fault point, can not cause the DC side overcurrent.But this converter control method is complicated, is still waiting engineering verification.
Summary of the invention
Purpose of the present invention, be to provide a kind of submodule, facies unit, voltage-source type multilevel converter and control method, it can suppress even stop AC system to inject fault current to DC network by the differential concatenation of turn-off device in the submodule when DC Line Fault locking converter.
In order to reach above-mentioned purpose, the technical solution used in the present invention is:
A kind of submodule comprises the first branch road parallel with one another and the second branch road;
The first branch road comprises an energy-storage travelling wave tube and at least one first turn-off device of mutual series connection, and the equal inverse parallel of each the first turn-off device has diode, and has at least first a 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, the first branch road also comprises at least one charging circuit, this charging circuit is in parallel with the first turn-off device, and the first turn-off device that makes any one differential concatenation is all between the two ends of some charging circuits; And energy-storage travelling wave tube can only have following 4 kinds of situations with the annexation of the first turn-off device: the positive pole of energy-storage travelling wave tube is connected 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 of forward connection, or the negative pole of energy-storage travelling wave tube connects the positive pole of the first turn-off device of differential concatenation;
The second branch road comprises at least one charging circuit and at least two the second turn-off devices, the equal inverse parallel of each the second turn-off device has diode, all second turn-off devices are connected mutually, and at least one second turn-off device and other the second turn-off device differential concatenation, and charging circuit is in parallel with the second turn-off device, and the second turn-off device that makes any one differential concatenation is all between the two ends of some charging circuits.
Above-mentioned charging circuit adopts any one in following six kinds of structures: only adopt normally closed node; Only adopt 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 the diode reverse.
A kind of control method of aforesaid submodule, the control submodule is operated in following three kinds of states: conducting state, control all the first turn-off device conductings in the first branch road, all second turn-off devices of controlling in the second branch road turn-off; Off state, all first turn-off devices of controlling in the first branch road turn-off, and control all the second turn-off device conductings in two branch roads; Blocking is controlled all first turn-off devices in the first branch road and all second turn-off devices in the second branch road and is all turn-offed.
When being in series with normally closed node in the above-mentioned charging circuit, before the control submodule is operated in conducting or off state, at first pull open this normally closed node.
A kind of facies unit, comprise brachium pontis and lower brachium pontis, described upper and lower brachium pontis includes at least two submodules as claimed in claim 1 or 2 and at least one reactor of mutual series connection, all submodules in the described same brachium pontis connect in the same way, and the submodule closure in the upper and lower brachium pontis is opposite, and an 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 the DC network, and the mutual short circuit of the other end of upper and lower brachium pontis is as the interchange end points of this facies unit, in the incoming transport network.
A kind of facies unit, the submodule that comprises in the described upper and lower brachium pontis and the quantity of reactor are identical or different.
A kind of control method of aforesaid facies unit, each submodule in the control facies unit is operated in following three kinds of states: conducting state, control all the first turn-off device conductings in the first branch road, all second turn-off devices of controlling in the second branch road turn-off; Off state, all first turn-off devices of controlling in the first branch road turn-off, and control all the second turn-off device conductings in two branch roads; Blocking is controlled all first turn-off devices in the first branch road and all second turn-off devices in the second branch road and is all turn-offed.
When being in series with normally closed node in certain the submodule charging circuit in the above-mentioned facies unit, before controlling this submodule and being operated in conducting or off state, at first pull open this normally closed node.
A kind of voltage-source type multilevel converter comprises at least one aforesaid facies unit.
A kind of control method such as above-mentioned voltage-source type multilevel converter, each submodule in the facies unit of this converter of controlling composition is operated in following three kinds of states: conducting state, control all the first turn-off device conductings in the first branch road, all second turn-off devices of controlling in the second branch road turn-off; Off state, all first turn-off devices of controlling in the first branch road turn-off, and control all the second turn-off device conductings in two branch roads; Blocking is controlled all first turn-off devices in the first branch road and all second turn-off devices in the second branch road and is all turn-offed.
After adopting such scheme, beneficial effect of the present invention is:
(1) during the DC network fault, can suppress even stop AC network provide fault current to the fault point by turn-offing turn-off device in all submodules;
When (2) charging circuit comprises charging resistor, can cancel the charging resistor of converter AC.
Description of drawings
Fig. 1 is the first embodiment schematic diagram of submodule among the present invention;
Fig. 2 is the charging circuit schematic diagram of submodule among the present invention;
Fig. 3 is the second embodiment schematic diagram of submodule among the present invention;
Fig. 4 is the 3rd embodiment schematic diagram of submodule among the present invention;
Fig. 5 is the 4th embodiment schematic diagram of submodule among the present invention;
Fig. 6 is the control method schematic diagram of submodule shown in Figure 1;
Fig. 7 is the connection diagram of voltage-source type multilevel converter among the present invention.
Embodiment
The invention provides a kind of submodule for forming the voltage-source type multilevel converter, comprise the first branch road parallel with one another and the second branch road, article two, two of branch road and interface are as two exit points, be used for connecting external circuit, wherein, the first branch road comprises an energy-storage travelling wave tube and at least one turn-off device of mutual series connection, 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 this moment, the first branch road also comprised at least one charging circuit, this charging circuit is in parallel with turn-off device, and the principle of connection is to guarantee to make the turn-off device of any one differential concatenation all between the two ends of some charging circuits; 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 of forward connection, or the negative pole of energy-storage travelling wave tube connects the positive pole of the turn-off device of differential concatenation; The second branch road comprises at least one charging circuit and at least two turn-off devices, the equal inverse parallel of each turn-off device has diode, all turn-off devices are connected mutually, 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 that connects be guarantee to make any one differential concatenation turn-off device all between the two ends of some charging circuits, be elaborated below in conjunction with specific embodiment.
When described turn-off device adopts IGBT, described just very its collector electrode, described negative pole is its emitter; When described turn-off device adopts IGCT or GTO, described just very its anode, described negative pole is its negative electrode; When described turn-off device adopts MOSFET, described just very its drain electrode, described negative pole is its source electrode.
At first as shown in Figure 2, it is a kind of way of realization of charging circuit 19, two end points X3 of described charging circuit 19, can only adopt normally closed node 191 or charging resistor 192 between the X4, also can adopt normally closed node 191 to be in series with charging resistor 192, more can adopt in diode 193 and normally closed node 191 and the charging resistor 192 cascaded structure of any one or two kinds of devices, also namely have 6 kinds of implementation structures, Fig. 2 has provided three kinds of structures that device all adopts, wherein diode 193 needs differential concatenation, need to prove, no matter adopt which kind of combination implementation structure, each device is for being connected in series, therefore its position relationship is not construed as limiting, and structure shown in Figure 2 only is illustration.The effect of normally closed node is to pull open this normally closed node during by normal operation, makes the submodule of locking can stop AC network to provide fault current to the fault point; The effect of charging resistor is the charging current in the restriction converter charging process; Acting as of diode limits the charging current direction when charging circuit is in parallel with turn-off device.Can function as required be composed in series charging circuit by the various combination that adopts normally closed node, charging resistor and diode.
Below will provide several realization circuit that the invention provides submodule, and be elaborated.
As shown in Figure 1, it is a kind of realization circuit of submodule among the present invention, wherein, the first branch road comprises turn-off device 11, diode 12 and as the capacitor 10 of energy-storage travelling wave tube, wherein, diode 12 inverse parallels are at the two ends of turn-off device 11, and turn-off device 11 is series relationship with capacitor 10, 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; The second branch road comprises turn-off device 13,15, diode 14,16 and charging circuit 19, wherein, diode 14,16 respectively inverse parallels at turn-off device 13,15 two ends, turn-off device 13 forwards connect, and turn-off device 15 Opposite direction connections, " forward " herein, " oppositely " they are that the direction with capacitor 10 is as the criterion; Charging circuit 19 is connected in parallel on the two ends of turn-off device 15, is used to other submodule charging, and the structure preamble of charging circuit 19 is by the agency of, is not described in detail in this.
Cooperate 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 operating states: conducting state, off state and blocking.
Conducting state: turn-off device 11 conductings, turn-off device 13,15 turn-offs, 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 port X1, X2 of submodule, voltage between X1, X2 is the voltage of capacitor 10 at this moment, electric current can flow into from X1, X2 flows out, and also can flow into from X2, X1 flows out;
Off state: turn-off device 11 turn-offs, turn-off device 13,15 conductings, capacitor 10 is bypassed, and the voltage of exporting between output port X1, X2 is 0, and electric current can flow into from X1, successively by turn-off device 13 and diode 16, flowed out by X2 again, see Fig. 6 (b), also can flow into from X2, pass through successively turn-off device 15 and diode 14, flowed out by X1 again;
Blocking: if be in series with normally closed node 191 in the charging circuit 19, then when locking, at first need pull open this normally closed node 191; Turn-off device 11,13,15 all turn-offs, and electric current can flow into from X1, successively by diode 12 and capacitor 10, is flowed out by X2 again, sees shown in Fig. 6 (c); In shown in Fig. 6 (f), two kinds of situations are arranged: if be in series with normally closed node in the charging circuit 19, because normally closed node pulls open, electric current can not flow into from X2, X1 flows out, and if the normally closed node of not connecting in the charging circuit 19, then this moment, no matter this charging circuit only adopted charging resistor 192, or adopt charging resistor 192 to connect with diode 193, electric current all can flow into from X2, through overcharge circuit 19 and diode 14, is flowed out by X1 more successively.
As shown in Figure 3, that the second that the invention provides submodule is implemented structure, the component number that it adopts and kind are identical with structure shown in Figure 1: the first branch road comprises turn-off device 21, diode 22 and capacitor 20, the second branch road comprises turn-off device 23,25, diode 24,26 and charging circuit 19, be from the different of structure shown in Figure 1: charging circuit 19 is connected in parallel on the two ends of the second branch road; This control method of implementing structure is identical with Fig. 1 structure, repeats no more.
Shown in Figure 4 is that the third of submodule of the present invention implemented structure, and the second branch road comprises 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 among Fig. 1, no longer detailed description; The first branch road comprises turn-off device 31, diode 32 and capacitor 33, wherein, diode 32 inverse parallels are at the two ends of turn-off device 31, the exit point X1 of the anodal connexon module of capacitor 30, negative pole connects the negative pole of turn-off device 31, and the positive pole of turn-off device 31 connects exit point X2, and also can turn-off device 31 is that differential concatenation is in circuit.The control method that this kind implemented structure is identical with Fig. 1 structure, when submodule is in conducting state, and turn-off device 31 conductings, turn-off device 33,35 turn-offs; When submodule was in off state, turn-off device 31 turn-offed turn-off device 33,35 conductings; When submodule was in blocking, turn-off device 31,33,35 all turn-offed.Concrete current direction is not described in detail in this.
Shown in Figure 5ly is the 4th kind of submodule of the present invention and implements structure, the second branch road comprises 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 among Fig. 1, no longer detailed description; The first branch road comprises turn-off device 41,43, diode 42,44, charging circuit 19 and capacitor 40, diode 42,44 respectively inverse parallels at turn-off device 41,43 two ends, turn-off device 43,41 and capacitor 40 connect successively, and turn-off device 43 differential concatenations, the series connection of turn-off device 41 forwards, charging circuit 19 is in parallel with the turn-off device 43 of differential concatenation.This control method of implementing structure is identical with control method principle shown in Figure 6, have three kinds of operating states: during conducting state, all turn-off device conductings in the first branch road, all turn-off devices in the second branch road turn-off, during off state, all turn-off devices in the first branch road turn-off, all turn-off device conductings in the second branch road, during blocking, all turn-off devices that connect in the submodule all turn-off, and before control enters blocking, if be in series with normally closed node in the charging circuit, need first normally closed node to be pulled open, this moment, electric current can not flow into from output port X1, output port X2 flows out, and can not flow into from X2, X1 flows out.
After adopting aforementioned structure, when submodule was uncharged, normally closed node was closed, can be other submodule charging by charging circuit and diode; After finishing, the submodule charging before the release (before namely being operated in conducting or off state), can pull open normally closed node by corresponding control circuit because submodule is charged.
As shown in Figure 7, the circuit diagram of the facies unit that is formed by aforementioned submodule, wherein, described facies unit comprises brachium pontis 3 and lower brachium pontis 4, described upper and lower brachium pontis includes at least two submodule 1(SM of mutual series connection) and at least one reactor 2, and the quantity of the submodule 1 that comprises in the upper and lower brachium pontis and reactor 2 can be identical, and also can be different, the particular circuit configurations of each submodule 1 can be identical, also can be different; In same brachium pontis (upper brachium pontis 3 or lower brachium pontis 4), all submodules 1 connect in the same way, and the closure of the submodule in the upper and lower brachium pontis 1 is opposite; 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 the 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 the DC network, and the other end of upper brachium pontis 3, lower brachium pontis 4 links together, common interchange end points 5 as described facies unit is in the incoming transport network.Need to prove, for upper brachium pontis 3 or lower brachium pontis 4, described submodule 1 is also unrestricted with the series position of reactor 2, and because a reactor can be regarded a plurality of sub-reactors as and be composed in series, therefore the number of described reactor is not restricted, as long as the reactance total value in certain brachium pontis reaches requirement corresponding to this brachium pontis.
The present invention also provides a kind of voltage-source type multilevel converter, comprises the facies unit that at least one is shown in Figure 7, and the number of described facies unit can decide according to the interchange end points number of AC system.Described converter is by turn-offing the turn-off device inhibition in all submodules or stoping AC network to provide fault current to the fault point of DC network.When DC network generation earth fault, for example among Fig. 7 during the first direct current end points 6 ground connection, make all submodules 1 all be in blocking by the locking converter, because electric current can't flow into from the output port X2 of submodule 1, X1 flows out, so AC network can't provide fault current to the fault point.
Above embodiment only for explanation technological thought of the present invention, can not limit protection scope of the present invention with this, every technological thought that proposes according to the present invention, and any change of doing on the technical scheme basis all falls within the protection range of the present invention.
Claims (10)
1. a submodule is characterized in that: comprise the first branch road parallel with one another and the second branch road;
The first branch road comprises an energy-storage travelling wave tube and at least one first turn-off device of mutual series connection, and the equal inverse parallel of each the first turn-off device has diode, and has at least first a 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, the first branch road also comprises at least one charging circuit, this charging circuit is in parallel with the first turn-off device, and the first turn-off device that makes any one differential concatenation is all between the two ends of some charging circuits; And energy-storage travelling wave tube can only have following 4 kinds of situations with the annexation of the first turn-off device: the positive pole of energy-storage travelling wave tube is connected 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 of forward connection, or the negative pole of energy-storage travelling wave tube connects the positive pole of the first turn-off device of differential concatenation;
The second branch road comprises at least one charging circuit and at least two the second turn-off devices, the equal inverse parallel of each the second turn-off device has diode, all second turn-off devices are connected mutually, and at least one second turn-off device and other the second turn-off device differential concatenation, and charging circuit is in parallel with the second turn-off device, and the second turn-off device that makes any one differential concatenation is all between the two ends of some charging circuits.
2. a kind of submodule as claimed in claim 1, it is characterized in that: described charging circuit adopts any one in following six kinds of structures: only adopt normally closed node; Only adopt 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 the diode reverse.
3. the control method of a submodule as claimed in claim 1, it is characterized in that controlling submodule and be operated in following three kinds of states: conducting state, control all the first turn-off device conductings in the first branch road, all second turn-off devices of controlling in the second branch road turn-off; Off state, all first turn-off devices of controlling in the first branch road turn-off, and control all the second turn-off device conductings in two branch roads; Blocking is controlled all first turn-off devices in the first branch road and all second turn-off devices in the second branch road and is all turn-offed.
4. the control method of a kind of submodule as claimed in claim 3 is characterized in that: when being in series with normally closed node in the described charging circuit, before the control submodule is operated in conducting or off state, at first pull open this normally closed node.
5. facies unit, it is characterized in that: comprise brachium pontis and lower brachium pontis, described upper and lower brachium pontis includes at least two submodules as claimed in claim 1 or 2 and at least one reactor of mutual series connection, all submodules in the described same brachium pontis connect in the same way, and the submodule closure in the upper and lower brachium pontis is opposite, and an 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 the DC network, and the mutual short circuit of the other end of upper and lower brachium pontis is as the interchange end points of this facies unit, in the incoming transport network.
6. a kind of facies unit as claimed in claim 5, it is characterized in that: the submodule that comprises in the described upper and lower brachium pontis and the quantity of reactor are identical or different.
7. the control method of a facies unit as claimed in claim 5, each submodule that it is characterized in that controlling in the facies unit is operated in following three kinds of states: conducting state, control all the first turn-off device conductings in the first branch road, all second turn-off devices of controlling in the second branch road turn-off; Off state, all first turn-off devices of controlling in the first branch road turn-off, and control all the second turn-off device conductings in two branch roads; Blocking is controlled all first turn-off devices in the first branch road and all second turn-off devices in the second branch road and is all turn-offed.
8. the control method of a kind of facies unit as claimed in claim 7 is characterized in that: when being in series with normally closed node in certain the submodule charging circuit in the described facies unit, before controlling this submodule and being operated in conducting or off state, at first pull open this normally closed node.
9. a voltage-source type multilevel converter is characterized in that: comprise at least one such as claim 5 or 6 described facies units.
10. the control method of a voltage-source type multilevel converter as claimed in claim 9, it is characterized in that each submodule in the facies unit of this converter of controlling composition is operated in following three kinds of states: conducting state, control all the first turn-off device conductings in the first branch road, all second turn-off devices of controlling in the second branch road turn-off; Off state, all first turn-off devices of controlling in the first branch road turn-off, and control all the second turn-off device conductings in two branch roads; Blocking is controlled all first turn-off devices in the first branch road and all second turn-off devices in the second branch road and is all turn-offed.
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| CN109586334A (en) * | 2018-11-07 | 2019-04-05 | 詹长江 | A kind of inverter of integrated energy consuming circuitry function |
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| WO2015180204A1 (en) * | 2014-05-29 | 2015-12-03 | 华中科技大学 | Submodule topology for modular multi-level converter and application thereof |
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| CN105429495A (en) * | 2015-12-10 | 2016-03-23 | 西南交通大学 | Modular multilevel converter using multi-state submodule |
| CN105429495B (en) * | 2015-12-10 | 2017-11-14 | 西南交通大学 | A kind of Modular multilevel converter using polymorphic submodule |
| 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 |
| CN109586334A (en) * | 2018-11-07 | 2019-04-05 | 詹长江 | A kind of inverter of integrated energy consuming circuitry function |
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