CN103825482B - Three-phase and four-line bridge-type modular unit tandem compound high tension transformer - Google Patents
Three-phase and four-line bridge-type modular unit tandem compound high tension transformer Download PDFInfo
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- CN103825482B CN103825482B CN201410073339.4A CN201410073339A CN103825482B CN 103825482 B CN103825482 B CN 103825482B CN 201410073339 A CN201410073339 A CN 201410073339A CN 103825482 B CN103825482 B CN 103825482B
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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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Abstract
nullThe invention provides three-phase and four-line bridge-type modular unit tandem compound high tension transformer，Including 2N three-phase and four-line bridge-type modular unit and 8 brachium pontis inductance，Wherein the upper brachium pontis of three-phase and four-line high tension transformer is by the most in series with one end of 4 brachium pontis inductance again after the series connection of N number of three-phase and four-line bridge-type modular unit，Lower brachium pontis is followed in series to form with other N number of three-phase and four-line bridge-type modular unit by one end of other 4 brachium pontis inductance，Then the other end of 4 brachium pontis inductance going up brachium pontis is connected with the other end of 4 brachium pontis inductance of lower brachium pontis，4 junction points between 4 brachium pontis inductance and 4 brachium pontis inductance of lower brachium pontis of upper brachium pontis constitute the outfan of corresponding phase brachium pontis，The junction point of upper and lower bridge arm inductance constitutes ac output end and the center line of corresponding phase brachium pontis，Ac output end is connected to the load of three-phase Y-connection mode，Center line is connected to load midpoint.The present invention reduces components and parts, decrease power cell number, combination is simple, and reliability is higher.
Description
Technical field
The invention belongs to converters or high voltage applications field, relate to the structure of three-phase and four-line bridge-type modular unit tandem compound high tension transformer topology.
Background technology
One of key technology realizing high-voltage high-power converter is high power converter topology, conducts in-depth research high voltage and high power inverter the most in the world, it is proposed that numerous significant pressure Large Copacity topology.The technology of main structure topology includes: 1, the direct serial connection technology of device for power switching, its advantage is can directly to apply existing topology, shortcoming is that each power switching device series exists static and dynamic voltage balancing problem, device for power switching is turned on and off coherence request higher, it is easy to device fault occurs；2, multiple technology, its advantage be tradition H bridge or three-phase bridge circuit couple by Multiple coil Industrial Frequency Transformer, it is achieved high voltage, low harmony wave output, shortcoming is to need to use power frequency multiwinding transformer, cost, loss, complexity increase, and have dc magnetization phenomenon；3, multilevel converter, its advantage is that DC side uses series direct current electric capacity to realize device for power switching and all press, and shortcoming is that the electric conduction stream load of device for power switching is inconsistent, causes the imbalance of DC voltage on each DC capacitor, and topology is more complicated；4, block combiner multi-level converter i.e. MMC changer; its advantage is that each phase brachium pontis is according to electric pressure; it is followed in series to form by multiple identical modular power units and two brachium pontis inductance; achieve high modularization; than general multilevel converter, there is more obvious advantage at aspects such as device current stress, off-center operation, error protections, be the changer of current high voltage electric energy conversion first-selection.
The present invention, on the basis of MMC changer, proposes a kind of degree of modularity higher three-phase and four-line bridge-type modular unit tandem compound high tension transformer.
Summary of the invention
The present invention proposes a kind of three-phase and four-line bridge-type modular unit tandem compound high tension transformer, compare with existing high voltage and high power inverter, the degree of modularity is higher, decrease components and parts, decreasing power cell number, combination is simple, and reliability is higher, and cost declines, hold out broad prospects in high-voltage large-capacity commercial Application.The present invention is achieved through the following technical solutions.
Three-phase and four-line bridge-type modular unit tandem compound high tension transformer, it includes 2N three-phase and four-line bridge-type modular unit and 8 brachium pontis inductance, wherein the upper brachium pontis of three-phase and four-line high tension transformer is by the most in series with one end of 4 brachium pontis inductance again after the series connection of N number of three-phase and four-line bridge-type modular unit, lower brachium pontis is followed in series to form with other N number of three-phase and four-line bridge-type modular unit by one end of other 4 brachium pontis inductance, then the other end of 4 brachium pontis inductance going up brachium pontis is connected with the other end of 4 brachium pontis inductance of lower brachium pontis, 4 junction points between 4 brachium pontis inductance and 4 brachium pontis inductance of lower brachium pontis of upper brachium pontis constitute the outfan of corresponding phase brachium pontis, N is positive integer.
Further, described three-phase and four-line bridge-type modular unit is made up of power switch component and 1 DC capacitor of 8 band fly-wheel diodes.
Further, in described three-phase and four-line bridge-type modular unit, every 2 power switch components, 1 phase in series, 8 power switch components constitute 4 phases altogether, i.e. a phase, b phase, c phase and o phase, the most every 1 phase the most each includes the first switching tube and second switch pipe, and the two ends of the first switching tube and second switch pipe are all connected with fly-wheel diode, the respectively first fly-wheel diode and the second fly-wheel diode；The positive pole of the first switching tube receives A end, and negative pole receives B end；The positive pole of second switch pipe receives B end, and negative pole receives C end, and wherein B end, C end are outfan.Then the A end of a phase, b phase, c phase and o phase is connected with each other, and selects the o phase i.e. A end of center line phase to receive the positive pole of DC capacitor, C end receives the negative pole of DC capacitor, the magnitude of voltage that voltage E=V/2N, V are input DC power on DC capacitor.
Further, three-phase and four-line bridge-type modular unit includes 2 kinds of duties, and the first state is the first switching tube or the conducting of the first fly-wheel diode, and other device is turned off；The second state is second switch pipe or the conducting of the second fly-wheel diode, and other device is turned off.
Further, the upper brachium pontis of three-phase and four-line high tension transformer is connected in series three-phase and four-line bridge-type modular unit and 4 brachium pontis inductance connections are constituted, the B end i.e. U of i.e. first the three-phase and four-line every phase of bridge-type modular unit by N number ofa1、Ub1、Uc1、Uo1It is connected with the positive pole of power supply, the C end of first three-phase and four-line every phase of bridge-type modular unit and the B end i.e. U of second three-phase and four-line bridge-type modular unit phase homophasea2、Ub2、Uc2、Uo2It is connected, connects rule, the U of i-th three-phase and four-line bridge-type modular unit according to thisai、Ubi、Uci、UoiBeing connected respectively to the C end of the i-th-1 three-phase and four-line bridge-type modular unit phase homophase, the C end of the i-th three-phase and four-line every phase of bridge-type modular unit is connected respectively to the B end i.e. U of i+1 three-phase and four-line bridge-type modular unit phase homophasea (i+1)、Ub (i+1)、Uc (i+1)、Uo (i+1), N number of three-phase and four-line bridge-type modular unit connect after, the C end of the n-th three-phase and four-line every phase of bridge-type modular unit respectively with the first inductance, the second inductance, the 3rd inductance and the 4th inductance connection.
Further, the lower brachium pontis of three-phase and four-line high tension transformer is sequentially connected with N number of three-phase and four-line bridge-type modular unit being connected in series by 4 brachium pontis inductance and constitutes, the 5th inductance, the 6th inductance, the 7th inductance and the 8th inductance (Lon) respectively with the B end i.e. U of the N+1 three-phase and four-line every phase of bridge-type modular unita (N+1)、Ub (N+1)、Uc (N+1)、Uo (N+1)It is connected, the C end of the N+1 three-phase and four-line every phase of bridge-type modular unit and the B end i.e. U of the N+2 three-phase and four-line bridge-type modular unit phase homophasea (N+2)、Ub (N+2)、Uc (N+2)、Uo (N+2)It is connected, according to this rule, after N number of three-phase and four-line bridge-type modular unit connects, the C end i.e. a of the 2N three-phase and four-line every phase of bridge-type modular unit-、b-、c-、o-End is connected to the negative pole of power supply.
Further, three-phase and four-line high tension transformer is drawn at junction point i.e. a, b, c, o point of upper and lower bridge arm inductance, and wherein a, b, c point is connected to the load of three-phase Y-connection, and o point is connected to load midpoint.
The present invention, compared with MMC changer, has the advantage that and technique effect: 1, modular power unit is different, and MMC changer uses uniphase mode massing power cell, and the present invention is to use three-phase and four-line bridge-type modular unit；2, compound mode is different, after MMC changer is the combination of uniphase mode massing power unit cascade, the most combined, and the present invention to be the series connection of three-phase and four-line bridge-type modular power unit once combined.Thus the present invention is compared with MMC changer, there is following significant advantage: 1, decrease components and parts；2, the degree of modularity is higher；3, combination is simple；4, reliability is high；5, cost declines.
Accompanying drawing explanation
Fig. 1 is the three-phase and four-line bridge-type modular unit structure chart constituting high tension transformer.
Fig. 2 is the three-phase and four-line bridge-type modular unit tandem compound high tension transformer main circuit diagram of the present invention.
Fig. 3 is the three-phase and four-line bridge-type modular unit tandem compound high tension transformer structure chart with 2N=4 module.
Fig. 4 has 3 level output voltage waveforms of the three-phase and four-line bridge-type modular unit tandem compound high tension transformer of 2N=4 module when being and use multilevel.
Fig. 5 has 4 level output voltage waveforms of the three-phase and four-line bridge-type modular unit tandem compound high tension transformer of 2N=4 module when being and use multilevel.
Specific embodiments
It is embodied as being further described to the present invention below in conjunction with accompanying drawing.
Shown in Fig. 1 is the three-phase and four-line bridge-type modular unit of the present invention, and three-phase and four-line bridge-type modular unit is made up of power switch component and 1 DC capacitor of 8 band fly-wheel diodes.The most every 2 power switch components, 1 phase in series, 8 power switch components constitute 4 phases, i.e. a phase, b phase, c phase and o phase altogether, and every 1 phase the most each includes the first switch transistor T1With second switch pipe T2, the first switch transistor T1Positive pole receive A end, negative pole receives B end, second switch pipe T2Positive pole receive B end, negative pole receives C end, and wherein B end, C end are outfan.Then the A end of a phase, b phase, c phase and o phase is connected with each other, and selects the o phase i.e. A end of center line phase to receive DC capacitor CEPositive pole, C end receive DC capacitor CENegative pole, DC capacitor CEOn the magnitude of voltage that voltage E=V/2N, V are input DC power.
According to the three-phase and four-line bridge-type modular unit structure of Fig. 1, including 2 kinds of duties, the first state is the first switching tube or the conducting of the first fly-wheel diode, and other device is turned off；The second state is second switch pipe or the conducting of the second fly-wheel diode, and other device is turned off.
Three-phase and four-line bridge-type modular unit tandem compound high tension transformer constituted mode shown in Fig. 2 is as follows: 1, the upper brachium pontis of three-phase and four-line high tension transformer is made up of N number of three-phase and four-line bridge-type modular unit being connected in series and 4 brachium pontis inductance connections, i.e. first three-phase and four-line bridge-type modular unit M1The B end i.e. U of every phasea1、Ub1、Uc1、Uo1It is connected with the positive pole of power supply V, first three-phase and four-line bridge-type modular unit M1The C end of every phase and second three-phase and four-line bridge-type modular unit M2The B end i.e. U of phase homophasea2、Ub2、Uc2、Uo2It is connected, connects rule, i-th three-phase and four-line bridge-type modular unit M according to thisiThe B end i.e. U of every phaseai、Ubi、Uci、UoiIt is connected respectively to the i-th-1 three-phase and four-line bridge-type modular unit Mi-1The C end of phase homophase, i-th three-phase and four-line bridge-type modular unit MiThe C end of every phase is connected respectively to i+1 three-phase and four-line bridge-type modular unit Mi+1The B end i.e. U of phase homophasea (i+1)、Ub (i+1)、Uc (i+1)、Uo (i+1), after N number of three-phase and four-line bridge-type modular unit connects, n-th three-phase and four-line bridge-type modular unit MNThe C end of every phase respectively with the first inductance Lap, the second inductance Lbp, the 3rd inductance LcpWith the 4th inductance LopConnect；2, the lower brachium pontis of three-phase and four-line high tension transformer is connected and composed with N number of three-phase and four-line bridge-type modular unit being connected in series by 4 brachium pontis inductance, the 5th inductance Lan, the 6th inductance Lbn, the 7th inductance LcnWith the 8th inductance LonRespectively with the N+1 three-phase and four-line bridge-type modular unit MN+1The B end i.e. U of every phasea (N+1)、Ub (N+1)、Uc (N+1)、Uo (N+1)It is connected, the N+1 three-phase and four-line bridge-type modular unit MN+1The C end of every phase and the N+2 three-phase and four-line bridge-type modular unit MN+2The B end i.e. U of phase homophasea (N+2)、Ub (N+2)、Uc (N+2)、Uo (N+2)It is connected, according to this rule, after N number of three-phase and four-line bridge-type modular unit connects, the 2N three-phase and four-line bridge-type modular unit M2NThe C end i.e. a of every phase-、b-、c-、o-End is connected to the negative pole of power supply V, is i.e. configured to lower brachium pontis；3, three-phase and four-line high tension transformer is drawn at junction point i.e. a, b, c, o point of upper and lower bridge arm inductance, and wherein a, b, c point is connected to the load of three-phase Y-connection, and o point is connected to load midpoint.
Fig. 3 is a three-phase and four-line bridge-type modular unit tandem compound high tension transformer with 2N=4 module, and it is by 4 three-phase and four-line bridge-type modules M1、M2、M3、M4And the brachium pontis inductance that 8 inductance value are identicalLConstitute.Use Multilevel modulation strategy adjustment center line phase voltage Vo, threephase load voltage V can be realizedao、Vbo、VcoMany level export, and the voltage with multiple levels waveform that two of which is different is shown in Figure 4 and 5.
Claims (4)
1. a three-phase and four-line bridge-type modular unit tandem compound high tension transformer, it is characterized in that including 2N three-phase and four-line bridge-type modular unit and 8 brachium pontis inductance, four terminals after wherein the upper brachium pontis of high tension transformer is connected by N number of three-phase and four-line bridge-type modular unit are the most in series with one end of 4 brachium pontis inductance again, lower brachium pontis is followed in series to form with other N number of three-phase and four-line bridge-type modular unit by one end of other 4 brachium pontis inductance, then the other end of 4 brachium pontis inductance going up brachium pontis is connected with the other end of 4 brachium pontis inductance of lower brachium pontis, 4 junction points between 4 brachium pontis inductance and 4 brachium pontis inductance of lower brachium pontis of upper brachium pontis constitute the outfan of corresponding phase brachium pontis, N is positive integer；Described three-phase and four-line bridge-type modular unit is made up of power switch component and 1 DC capacitor of 8 band fly-wheel diodes；
In described three-phase and four-line bridge-type modular unit, every 2 power switch components, 1 phase in series, 8 power switch components constitute 4 phases, i.e. a phase, b phase, c phase and o phase altogether, and the most every 1 phase the most each includes the first switching tube (T1) and second switch pipe (T2), the first switching tube (T1) and second switch pipe (T2) two ends be all connected with fly-wheel diode, the respectively first fly-wheel diode (D1) and the second fly-wheel diode (D2)；First switching tube (T1) positive pole receive A end, negative pole receives B end, second switch pipe (T2) positive pole receive B end, negative pole receives C end, and wherein B end, C end are outfan；Then the A end of a phase, b phase, c phase and o phase is connected with each other, and selects the o phase i.e. A end of center line phase to receive DC capacitor (CE) positive pole, C end receive DC capacitor (CE) negative pole, DC capacitor (CEThe magnitude of voltage that voltage E=V/2N, V are input DC power on)；Three-phase and four-line bridge-type modular unit includes 2 kinds of duties, and the first state is the first switching tube (T1) or the first fly-wheel diode (D1) conducting, other device is turned off；The second state is second switch pipe (T2) or the second fly-wheel diode (D2) conducting, other device is turned off.
Three-phase and four-line bridge-type modular unit tandem compound high tension transformer the most according to claim 1, it is characterized in that, the upper brachium pontis of high tension transformer is made up of N number of three-phase and four-line bridge-type modular unit being connected in series and 4 brachium pontis inductance connections, i.e. first three-phase and four-line bridge-type modular unit (M1) the B end i.e. U of every phasea1、Ub1、Uc1、Uo1It is connected with the positive pole of input DC power (V), first three-phase and four-line bridge-type modular unit (M1) the C end of every phase and second three-phase and four-line bridge-type modular unit (M2) the B end i.e. U of phase homophasea2、Ub2、Uc2、Uo2It is connected, connects rule, i-th three-phase and four-line bridge-type modular unit (M according to thisi) the B end U of every phaseai、Ubi、Uci、UoiIt is connected respectively to the i-th-1 three-phase and four-line bridge-type modular unit (Mi-1) the C end of phase homophase, i-th three-phase and four-line bridge-type modular unit (Mi) the C end of every phase is connected respectively to i+1 three-phase and four-line bridge-type modular unit (Mi+1) the B end i.e. U of phase homophasea(i+1)、Ub(i+1)、Uc(i+1)、Uo(i+1), after N number of three-phase and four-line bridge-type modular unit connects, n-th three-phase and four-line bridge-type modular unit (MN) every phase C end respectively with the first inductance (Lap), the second inductance (Lbp), the 3rd inductance (Lcp) and the 4th inductance (Lop) connect.
Three-phase and four-line bridge-type modular unit tandem compound high tension transformer the most according to claim 1, it is characterized in that, the lower brachium pontis of three-phase and four-line high tension transformer is connected and composed with N number of three-phase and four-line bridge-type modular unit being connected in series by 4 brachium pontis inductance, wherein the 5th inductance (Lan), the 6th inductance (Lbn), the 7th inductance (Lcn) and the 8th inductance (Lon) respectively with the N+1 three-phase and four-line bridge-type modular unit (MN+1) the B end i.e. U of every phasea(N+1)、Ub(N+1)、Uc(N+1)、Uo(N+1)It is connected, the N+1 three-phase and four-line bridge-type modular unit (MN+1) the C end of every phase and the N+2 three-phase and four-line bridge-type modular unit (MN+2) the B end i.e. U of phase homophasea(N+2)、Ub(N+2)、Uc(N+2)、Uo(N+2)It is connected, according to this rule, after N number of three-phase and four-line bridge-type modular unit connects, the 2N three-phase and four-line bridge-type modular unit (M2N) the C end i.e. a of every phase-、b-、c-、o-End is connected to the negative pole of input DC power (V), is i.e. configured to lower brachium pontis.
Three-phase and four-line bridge-type modular unit tandem compound high tension transformer the most according to claim 1, it is characterized in that, three-phase and four-line high tension transformer is drawn at junction point i.e. a, b, c, o point of upper and lower bridge arm inductance, wherein a, b, c point is connected to the load of three-phase Y-connection, and o point is connected to load midpoint.
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| CN101546964A (en) * | 2009-05-12 | 2009-09-30 | 北京交通大学 | Module combined multi-level converter |
| CN102097967A (en) * | 2010-12-10 | 2011-06-15 | 清华大学 | Cascaded multi-level converter |
| CN202872650U (en) * | 2012-07-10 | 2013-04-10 | 辽宁荣信电气传动技术有限责任公司 | H-bridge-based high-voltage stabilized power supply |
| CN203747683U (en) * | 2014-02-28 | 2014-07-30 | 华南理工大学 | Three-phase four-wire bridge-type modular unit series combination high-voltage transformer |
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- 2014-02-28 CN CN201410073339.4A patent/CN103825482B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101546964A (en) * | 2009-05-12 | 2009-09-30 | 北京交通大学 | Module combined multi-level converter |
| CN102097967A (en) * | 2010-12-10 | 2011-06-15 | 清华大学 | Cascaded multi-level converter |
| CN202872650U (en) * | 2012-07-10 | 2013-04-10 | 辽宁荣信电气传动技术有限责任公司 | H-bridge-based high-voltage stabilized power supply |
| CN203747683U (en) * | 2014-02-28 | 2014-07-30 | 华南理工大学 | Three-phase four-wire bridge-type modular unit series combination high-voltage transformer |
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