CN103701343B - Three-phase bridge module unit series combination high-voltage transformer - Google Patents
Three-phase bridge module unit series combination high-voltage transformer Download PDFInfo
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- CN103701343B CN103701343B CN201310719758.6A CN201310719758A CN103701343B CN 103701343 B CN103701343 B CN 103701343B CN 201310719758 A CN201310719758 A CN 201310719758A CN 103701343 B CN103701343 B CN 103701343B
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Abstract
The invention discloses a three-phase bridge module unit series combination high-voltage transformer, which comprises 2N three-phase bridge module units and six bridge arm inductors, wherein each three-phase bridge module unit consists of six power switch element with fly-wheel diodes, and a direct-current capacitor; the power switch unit of each phase is formed by connecting the anodes and cathodes of two power switch elements in series in sequence, and a series middle point and the cathodes are taken as output ends; the anodes of upper power switch elements in the three-phase bridge module units are connected together; the power switch unit of any phase is connected in series with the direct-current capacitor; the anodes of the upper power switch elements are connected with the anode of the direct-current capacitor; the cathodes of lower power switch units are connected with the cathode of the direct-current capacitor. By adopting the three-phase bridge module unit series combination high-voltage transformer, the numbers of elements and modularized power units are reduced, combination is easy, and high reliability and low cost are realized.
Description
Technical field
The invention belongs to converters or high voltage applications field, relate to the structure of three-phase bridge 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 combined high pressure changer.The changer that the present invention proposes has following different from MMC changer: 1, modular power unit is different, and MMC changer uses uniphase mode massing power cell, and the present invention is to use three-phase bridge modular power unit；2, compound mode is different, after MMC changer is the combination of every phase module power unit cascade, the most combined, and the present invention to be tandem compound of three-phase modular power cell complete.Thus the present invention is compared with MMC changer, there is following significant advantage: 1, decrease components and parts；2, modular power unit number is decreased；3, combination is simple；4, reliability is high；5, cost declines.
Summary of the invention
The present invention proposes a kind of three-phase bridge 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.
A kind of three-phase bridge modular unit tandem compound high tension transformer, it comprises 2N three-phase bridge modular unit and 6 brachium pontis inductance, wherein the upper brachium pontis of high tension transformer is by the most in series with one end of 3 brachium pontis inductance again after the series connection of N number of three-phase bridge modular unit, lower brachium pontis is followed in series to form with other N number of three-phase bridge modular unit by one end of other 3 brachium pontis inductance, then on high tension transformer, the other end of 3 brachium pontis inductance in brachium pontis is connected with the other end of described other 3 the brachium pontis inductance in lower brachium pontis, the ac output end of 3 junction point corresponding phase brachium pontis of composition between 3 brachium pontis inductance and 3 brachium pontis inductance in lower brachium pontis in upper brachium pontis, N is positive integer.
Further, described three-phase bridge modular unit is made up of power switch component and 1 DC capacitor of 6 band fly-wheel diodes.
Further, in three-phase bridge modular unit, every 2 power switch components, 1 phase in series, 6 power switch components constitute 3 phases i.e. a phase, b phase and c phase altogether, the most every 1 phase the most each includes the first switching tube and second switch pipe, and 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, negative pole receives C end, wherein B end, C end are outfan, the A end selecting a phase or b phase or c phase receives the positive pole of DC capacitor, C end receives the negative pole of DC capacitor, then the A end of a, b, c three-phase is connected, the magnitude of voltage that voltage E=V/2N, V are input DC power on DC capacitor.
Further, three-phase bridge modular unit tandem compound high tension transformer has 3 kinds of duties, and the first state is second switch pipe or the conducting of the second fly-wheel diode of upper brachium pontis N number of three-phase bridge modular unit, and other device is turned off；The second state is second switch pipe or the conducting of the second fly-wheel diode of lower brachium pontis N number of three-phase bridge modular unit, and other device is turned off；The third state is the first switching tube or the conducting of the first fly-wheel diode of 2N three-phase bridge modular unit of upper and lower bridge arm, and other device is turned off.
Further, the upper brachium pontis of high tension transformer is followed in series to form with brachium pontis inductance by N number of three-phase bridge modular unit, the B end i.e. a of i.e. first the every phase of three-phase bridge modular unit+、b+、c+End is connected with the positive pole of power supply, the B end i.e. U of first every phase of three-phase bridge modular unita1、Ub1、Uc1It is connected with the positive pole of power supply, the C end of first every phase of three-phase bridge modular unit and the B end i.e. U of second three-phase bridge modular unita2、Ub2、Uc2It is connected, connects rule, the B end i.e. U of i-th three-phase bridge modular unit according to thisai、Ubi、UciBeing connected respectively to the C end of the i-th-1 every phase of three-phase bridge modular unit, the C end of the every phase of i-th three-phase bridge modular unit is connected respectively to the B end i.e. U of i+1 three-phase bridge modular unita (i+1)、Ub (i+1)、Uc (i+1), N number of three-phase bridge modular unit connect after, the C end of the every phase of n-th three-phase bridge modular unit respectively with the first inductance, the second inductance and the 3rd inductance connection.
Further, the lower brachium pontis of high tension transformer is followed in series to form with N number of three-phase bridge modular unit by brachium pontis inductance, the i.e. the 4th inductance, the 5th inductance and the 6th inductance respectively with the B end U of the N+1 every phase of three-phase bridge modular unita (N+1)、Ub (N+1)、Uc (N+1)It is connected, the C end of the N+1 every phase of module and the B end i.e. U of the N+2 three-phase bridge modular unita (N+2)、Ub (N+2)、Uc (N+2)It is connected, according to this rule, after N number of three-phase bridge modular unit of the lower brachium pontis of high tension transformer connects, the C end i.e. a of the 2N every phase of three-phase bridge modular unit-、b-、c-End is connected to the negative pole of power supply V.
The present invention, compared with MMC changer, has following difference: 1, modular power unit is different, and MMC changer uses uniphase mode massing power cell, and the present invention is to use three-phase bridge modular power 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 tandem compound of three-phase modular power cell complete.Thus the present invention is compared with MMC changer, there is following significant advantage: 1, decrease components and parts；2, modular power unit number is decreased；3, combination is simple；4, reliability is high；5, cost declines.
Accompanying drawing explanation
Fig. 1 a ~ Fig. 1 c is the structure chart of the three-phase bridge modular unit of high tension transformer.
Fig. 2 is the three-phase bridge modular unit tandem compound high tension transformer main circuit of the present invention.
Fig. 3 is 3 kinds of working state figures of every phase brachium pontis in three-phase bridge modular unit tandem compound high tension transformer.
Fig. 4 is the three-phase bridge modular unit tandem compound high tension transformer with 2N=4 module.
Fig. 5 has the output voltage waveforms of the three-phase bridge modular unit tandem compound high tension transformer of 2N=4 module when being and use 120 ° of control.
Fig. 6 has the output voltage waveforms of the three-phase bridge modular unit tandem compound high tension transformer of 2N=4 module when being and use 180 ° of control.
Specific embodiments
It is embodied as being further described to the present invention below in conjunction with accompanying drawing.
Shown in Fig. 1 is three-phase bridge modular unit of the present invention, and the constituted mode of three-phase bridge modular unit is as follows: comprising power switch component and 1 DC capacitor, every 2 power switch components, 1 phase in series of 6 band fly-wheel diodes, they press the first switch transistor T1Positive pole receive A end, negative pole receives B end, second switch pipe T2Positive pole receive B end, negative pole is received the mode of C end and is connected, wherein B end, C end are outfan, then select the A end of a phase or b phase or c phase to receive DC capacitor CEPositive pole, C end receive DC capacitor CENegative pole (CEOn the magnitude of voltage that voltage E=V/2N, V are input DC power), and then the A end of a, b, c three-phase is connected.
The three-phase bridge modular unit tandem compound high tension transformer constituted mode of Fig. 2 is as follows: 1, upper brachium pontis is followed in series to form with brachium pontis inductance by N number of three-phase bridge modular unit, i.e. first three-phase bridge modular unit M1The B end i.e. a of every phase+、b+、c+End is connected with the positive pole of power supply V, first three-phase bridge modular unit M1B end i.e. its U of every phasea1、Ub1、Uc1It is connected with the positive pole of power supply V, C end and second three-phase bridge modular unit M2Ua2、Ub2、Uc2Being connected, according to this rule, the connected mode between three-phase bridge modular unit is i-th three-phase bridge modular unit MiUai、Ubi、UciIt is connected respectively to the i-th-1 three-phase bridge modular unit Mi-1The C end of every phase, i-th three-phase bridge modular unit MiThe C end of every phase is connected respectively to i+1 three-phase bridge modular unit Mi+1Ua (i+1)、Ub (i+1)、Uc (i+1), after N number of three-phase bridge modular unit connects, n-th three-phase bridge modular unit MNThe C end of every phase respectively with the first inductance Lap, the second inductance LbpWith the 3rd inductance LcpConnect；2, lower brachium pontis is followed in series to form with N number of three-phase bridge modular unit by brachium pontis inductance, the 4th inductance Lan, the 5th inductance LbnWith the 6th inductance LcnRespectively with the N+1 three-phase bridge modular unit MN+1The B end i.e. U of every phasea (N+1)、Ub (N+1)、Uc (N+1)It is connected, the N+1 three-phase bridge modular unit MN+1The C end of every phase and the N+2 three-phase bridge modular unit MN+2Ua (N+2)、Ub (N+2)、Uc (N+2)It is connected, according to this rule, after N number of three-phase bridge modular unit connects, the 2N three-phase bridge modular unit M2NThe C end i.e. a of every phase-、b-、c-End is connected to the negative pole of power supply V；3, by three-phase brachium pontis at the junction point of upper and lower 2 brachium pontis inductance, i.e. connecting at a, b, c point, load can be three-phase star or triangle connection.
According to the three-phase bridge modular unit tandem compound high tension transformer topology of Fig. 2, every phase brachium pontis has 3 kinds of duties, and the first state is upper brachium pontis N number of three-phase bridge i.e. M of modular unit1~MNThe second switch pipe T of middle three-phase2Or second sustained diode2Conducting, other device is turned off, and ac output end voltage is 2NE=V；The second state is lower brachium pontis N number of three-phase bridge i.e. M of modular unitN+1~M2NThe second switch pipe T of middle three-phase2Or second sustained diode2Conducting, other device is turned off, and ac output end voltage is 0；The third state is 2N i.e. M of three-phase bridge modular unit of upper and lower bridge arm1~M2NFirst switch transistor T of middle three-phase1Or first sustained diode1Conducting, other device is turned off, and ac output end voltage is NE=V/2.Fig. 3 is the work wave that each cross streams outfan is corresponding.
For the three-phase bridge modular unit tandem compound high tension transformer shown in Fig. 2, there is 2N three-phase bridge modular unit, by controlling output amplitude 2NE(V=2NE) and three-phase phase difference 120oAlternating voltage.
Fig. 4 is the three-phase bridge modular unit tandem compound high tension transformer with 2N=4 module based on Fig. 1 a, and it is by 4 three-phase bridge modules M1、M2、M3、M4And 6 brachium pontis inductance are constituted, wherein the inductance value of 6 brachium pontis inductance is identical, is L.According to 120oElectrically conducting manner controls, and a, b, c point is to power supply mid-point voltage Va、Vb、VcAnd the load line voltage V in a phase and b phaseabSee Fig. 5；According to 180oElectrically conducting manner controls, and a, b, c point is to power supply mid-point voltage Va、Vb、VcAnd the load line voltage V in a phase and b phaseabSee Fig. 6.
Claims (3)
1. a three-phase bridge modular unit tandem compound high tension transformer, it is characterized in that comprising 2N three-phase bridge modular unit and 6 brachium pontis inductance, wherein the upper brachium pontis of high tension transformer is by the most in series with one end of 3 brachium pontis inductance again after the series connection of N number of three-phase bridge modular unit, lower brachium pontis is followed in series to form with other N number of three-phase bridge modular unit by one end of other 3 brachium pontis inductance, then on high tension transformer, the other end of 3 brachium pontis inductance of brachium pontis is connected with the other end of 3 brachium pontis inductance of lower brachium pontis, 3 junction points between 3 brachium pontis inductance and 3 brachium pontis inductance in lower brachium pontis in upper brachium pontis constitute the ac output end of corresponding phase brachium pontis, N is positive integer；Described three-phase bridge modular unit is made up of power switch component and 1 DC capacitor of 6 band fly-wheel diodes；In described three-phase bridge modular unit, every 2 power switch components, 1 phase in series, 6 power switch components constitute 3 phases, i.e. a phase, b phase and c 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) 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, selects the A end of a phase or b phase or c phase to receive DC capacitor (CE) positive pole, C end receive DC capacitor (CE) negative pole, then the A end of a, b, c three-phase is connected, DC capacitor (CEThe magnitude of voltage that voltage E=V/2N, V are input DC power on)；Described changer includes 3 kinds of duties, and the first state is the second switch pipe (T of upper brachium pontis N number of three-phase bridge modular unit2) or the second fly-wheel diode (D2) conducting, other device is turned off；The second state is the second switch pipe (T of lower brachium pontis N number of three-phase bridge modular unit2) or the second fly-wheel diode (D2) conducting, other device is turned off；The third state is the first switching tube (T of 2N three-phase bridge modular unit of upper and lower bridge arm1) or the first fly-wheel diode (D1) conducting, other device is turned off.
Three-phase bridge modular unit tandem compound high tension transformer the most according to claim 1, it is characterised in that the upper brachium pontis of high tension transformer is followed in series to form with brachium pontis inductance by N number of three-phase bridge modular unit, first three-phase bridge modular unit (M1) the B end i.e. a of every phase+、b+、c+End is connected with the positive pole of power supply (V), first three-phase bridge modular unit (M1) the B end i.e. U of every phasea1、Ub1、Uc1It is connected with the positive pole of power supply (V), first three-phase bridge modular unit (M1) the C end of every phase and second three-phase bridge modular unit (M2) B end i.e. Ua2、Ub2、Uc2It is connected, connects rule, i-th three-phase bridge modular unit (M according to thisi) B end i.e. Uai、Ubi、UciIt is connected respectively to the i-th-1 three-phase bridge modular unit (Mi-1) the C end of every phase, i-th three-phase bridge modular unit (Mi) the C end of every phase is connected respectively to i+1 three-phase bridge modular unit (Mi+1) B end i.e. Ua(i+1)、Ub(i+1)、Uc(i+1), after N number of three-phase bridge modular unit connects, n-th three-phase bridge modular unit (MN) every phase C end respectively with the first inductance (Lap), the second inductance (Lbp) and the 3rd inductance (Lcp) connect.
Three-phase bridge modular unit tandem compound high tension transformer the most according to claim 1, it is characterised in that the lower brachium pontis of high tension transformer is followed in series to form with N number of three-phase bridge modular unit by brachium pontis inductance, the i.e. the 4th inductance (Lan), the 5th inductance (Lbn) and the 6th inductance (Lcn) respectively with the N+1 three-phase bridge modular unit (MN+1) the B end i.e. U of every phasea(N+1)、Ub(N+1)、Uc(N+1)It is connected, the N+1 module (MN+1) the C end of every phase and the N+2 three-phase bridge modular unit (MN+2) the B end i.e. U of every phasea(N+2)、Ub(N+2)、Uc(N+2)It is connected, according to this rule, after N number of three-phase bridge modular unit of the lower brachium pontis of high tension transformer connects, the 2N three-phase bridge modular unit (M2N) the C end i.e. a of every phase-、b-、c-End is connected to the negative pole of power supply (V).
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| CN101465606A (en) * | 2008-09-17 | 2009-06-24 | 刘建政 | Parallel-in converter for directly-driving wind power generation system |
| CN102130619A (en) * | 2011-03-21 | 2011-07-20 | 中国电力科学研究院 | Voltage balancing control method for multi-level modular converter |
| CN102843031A (en) * | 2012-08-14 | 2012-12-26 | 华北电力大学 | Basic circuit of improved modular multilevel converter |
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| CN204376745U (en) * | 2013-12-21 | 2015-06-03 | 华南理工大学 | Three-phase bridge modular unit tandem compound high tension transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5933339A (en) * | 1998-03-23 | 1999-08-03 | Electric Boat Corporation | Modular static power converter connected in a multi-level, multi-phase, multi-circuit configuration |
| JP5941631B2 (en) * | 2011-07-26 | 2016-06-29 | 株式会社日立製作所 | Power converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101465606A (en) * | 2008-09-17 | 2009-06-24 | 刘建政 | Parallel-in converter for directly-driving wind power generation system |
| CN102130619A (en) * | 2011-03-21 | 2011-07-20 | 中国电力科学研究院 | Voltage balancing control method for multi-level modular converter |
| CN102843031A (en) * | 2012-08-14 | 2012-12-26 | 华北电力大学 | Basic circuit of improved modular multilevel converter |
| CN103248254A (en) * | 2013-05-09 | 2013-08-14 | 中国矿业大学 | Pre-charging system and method for modular multilevel inverter |
| CN204376745U (en) * | 2013-12-21 | 2015-06-03 | 华南理工大学 | Three-phase bridge modular unit tandem compound high tension transformer |
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