CN102904420A - Multi-port current transformer - Google Patents

Multi-port current transformer Download PDF

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Publication number
CN102904420A
CN102904420A CN2012103763710A CN201210376371A CN102904420A CN 102904420 A CN102904420 A CN 102904420A CN 2012103763710 A CN2012103763710 A CN 2012103763710A CN 201210376371 A CN201210376371 A CN 201210376371A CN 102904420 A CN102904420 A CN 102904420A
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CN
China
Prior art keywords
basic module
port
current transformer
bridge
level
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Pending
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CN2012103763710A
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Chinese (zh)
Inventor
王平
马骁骁
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Institute of Electrical Engineering of CAS
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Institute of Electrical Engineering of CAS
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Application filed by Institute of Electrical Engineering of CAS filed Critical Institute of Electrical Engineering of CAS
Priority to CN2012103763710A priority Critical patent/CN102904420A/en
Publication of CN102904420A publication Critical patent/CN102904420A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a multi-port current transformer which consists of basic modules (1, 2, 3) and balanced circuits, wherein a first basic module (1) is composed of a modular multi-level current transformer, the alternating-current side of the first basic module serves as a first port, and the direct-current side of the first basic module serves as a direct-current busbar; a second basic module (2) and a third basic module (3) are both formed by the serial connection and parallel connection of insulation linkage levels (6); high-voltage sides of the second basic module and the third basic module are connected in parallel to the direct-current busbar after being connected in series, and each level of the high-voltage sides is connected in parallel to a capacitor with the equal capacity; the low-voltage side of the second basic module is a second port; the low-voltage side of the third basic module is a third port; a first balanced circuit (4) is composed of a single-phase insulation voltage transformer of an auxiliary side multi-winding and an auxiliary H-bridge thereof, and is connected between the third port and the direct-current busbar; a second balanced circuit (5) is composed of insulation linkage levels (6), and is connected between the high-voltage sides of the second basic module and the third basic module (2, 3); and the multi-port current transformer comprises a balanced circuit.

Description

The multiport current transformer
Technical field
The present invention relates to a kind of current transformer.
Background technology
In recent years, there are a lot of researchs to be devoted to develop cleaning, safe, sustainable, economic electric energy.Regenerative resource is not easy to be access in electric power system, must be connected by electronic power convertor equipment, and for this reason, power electronic equipment more and more is used in the system of high-power.The research of many electric power systems aspect all is centered around the power electronic equipment of the power control that can provide more flexible, intelligent.The multiport current transformer is different from common single port input, the current transformer of single port output, owing to have special structure, can single port input, multiport output, perhaps multiport input, single port output, even multiport is inputted, multiport output, thereby flowing of power ratio control more flexibly, can give full play to its advantage as the node in the electrical network.
The topology of multiport current transformer has several, and wherein newer is the multiport current transformer topology of the UNIFLEX project proposition of Britain, is based on the high modularization current transformer of isolated form full-bridge DC/DC converter.
As everyone knows, regenerative resource accesses electrical network not too easily, must pass through electronic power convertor, the multiport current transformer not only can connect different loads, power supply, can also be used for connecting the energy-storage systems such as regenerative resource and fuel cell, be a kind of cleaning, efficient, continuable electric energy conversion system.
Summary of the invention
The objective of the invention is to overcome the shortcoming that existing multiport current transformer voltage is difficult to balance, proposing two kinds, to carry out the multiport current transformer of balance of voltage control by circuit clamping newly topological.The present invention not only can realize the two-way flow of electric energy, keeps simultaneously the electrical isolation of both sides, and can and keep the balance of voltage with different loads, can connect the distributed power energy, satisfies the demand of the different electric power power conversion of following intelligent grid.
Multiport current transformer of the present invention is by three basic module and balance the electric circuit constitute.Multiport current transformer of the present invention has three ports, and three ports lay respectively in the three basic module.In three ports, the power of the first port equals the power sum of the second port and the 3rd port.The first basic module is made of modular multi-level converter; The second basic module is identical with the 3rd basic module structure, consists of by the connection in series-parallel of isolation link level.The first balancing circuitry is made of single-phase isolating transformer and the attached H bridge of the many windings of secondary, and the second balancing circuitry is made of isolation link level.
Multiport current transformer of the present invention has following technical characterstic:
1. can realize the basic function such as two-way flow, electrical isolation of energy;
2. can connect three and be in the not even system of same frequency of out of phase;
3. the first port power equals the second port and the 3rd port power sum;
4. owing to the existence of balancing circuitry, the second port and the 3rd port can be with different loads and keep the balance of voltage;
5. if the three basic module is replaced to other topological current transformers, keep balancing circuitry, still can consist of feasible multiport current transformer;
6. the present invention can connect the distributed power energy, as the multiport node in the electrical network, satisfies the demand of different electric power power conversion.
Description of drawings
The schematic diagram of Fig. 1 embodiment of the invention 1;
The schematic diagram of Fig. 2 embodiment of the invention 2;
Modular multi-level converter sub modular structure schematic diagram among Fig. 3 the present invention in the first basic module;
The isolated form full-bridge DC/DC transformer configuration schematic diagram of isolation link level among Fig. 4 the present invention;
The structure principle chart of balancing circuitry 4 among Fig. 5 the present invention;
The simulation waveform of Fig. 6 embodiment of the invention 1;
The simulation waveform of Fig. 7 embodiment of the invention 2;
The simulation waveform of Fig. 8 embodiment of the invention 1;
The simulation waveform of Fig. 9 embodiment of the invention 2;
Among the figure: 1 first basic module, 2 second basic modules, 3 the 3rd basic modules, 4 first balancing circuitrys, 5 second balancing circuitrys, 6-1,6-2,6-n, 6-n+1,6-n+2 ... 6-2n is based on the isolation link level of isolated form full-bridge DC/DC converter, 7-1,7-2,7-m is based on the modular multi-level converter submodule of half-bridge structure, L1, L2, modular multi-level converter brachium pontis inductance in L6 the first basic module 1, the submodule electric capacity of modular multi-level converter in Csm the first basic module 1, C1, C2, the C2n dc-link capacitance, Cp2 the second port dc-link capacitance; Cp3 three-port DC bus capacitor.
Embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments.
Fig. 1 is the multiport current transformer that the embodiment of the invention 1 comprises balancing circuitry 4.As shown in Figure 1, the embodiment of the invention 1 is comprised of the first basic module 1, the second basic module 2, the 3rd basic module 3 and the first balancing circuitry 4.
Described the first basic module 1 is made of modular multi-level converter, and modular multi-level converter has three-phase, every up and down two brachium pontis, totally six brachium pontis of dividing mutually.Each brachium pontis is by m submodule 7-1,7-2 ... 7-m, m 〉=4, and a brachium pontis inductance is composed in series.Six brachium pontis inductance L 1, L2 ... L6 is connected on respectively in six brachium pontis.Sub modular structure as shown in Figure 3, each submodule is by two IGBT with anti-paralleled diode, be that S1, S2 are composed in series half-bridge structure, sub-module capacitance Csm in parallel between the two ends after S1, the S2 series connection, the positive and negative port that externally connects as submodule is drawn at the two ends of S2.During a plurality of submodule series connection, the positive port of a submodule connects the negative terminal mouth of another submodule.All sub modular structures in the first basic module 1 are identical.
The three-phase of modular multi-level converter AC is as the first port of multiport current transformer of the present invention, and the DC side of modular multi-level converter is as the dc bus of multiport current transformer of the present invention.
Described the second basic module 2 and the 3rd basic module 3 structures are identical, consist of by the connection in series-parallel of n level isolation link level.The structure of isolation link level is isolated form full-bridge DC/DC converter.The second basic module 2 is by n isolated form full-bridge DC/DC converter 6-1,6-2 ... the 6-n connection in series-parallel forms, the 3rd basic module 3n isolated form full-bridge DC/DC converter 6-n+1,6-n+2 ... the 6-2n connection in series-parallel forms, n 〉=4.
As shown in Figure 4, each described isolated form full-bridge DC/DC converter is comprised of H bridge and single-phase isolating transformer of high frequency that two IGBT form, and described transformer voltage ratio is 1:1, and no-load voltage ratio also can change according to the design needs.The former limit of described transformer and secondary connect respectively the AC of two H bridges, the DC side of two H bridges is as the port that externally connects, the DC side of a H bridge is input side, two terminals of this DC side are respectively positive and negative end, the DC side of another H bridge is outlet side, and two terminals of this DC side are respectively positive and negative end.
The input side series connection of n level isolation link level, n 〉=4, the input side plus end that is every grade of isolation link level links to each other with the negative terminal that another grade isolation links the level input side, the outlet side of every grade of isolation link level is in parallel with the outlet side that another grade isolation links level, the plus end that is the outlet side of every grade of isolation link level is connected together, the negative terminal of every grade of isolation link level is connected together, and consists of the second basic module.The series side of isolation link level is the high-pressure side of the second basic module, and the side in parallel of isolation link level is the low-pressure side of the second basic module.The 3rd basic module and the second basic module structure are identical.Second with the positive and negative terminal of input side of the on high-tension side every one-level isolation link level of the 3rd basic module between capacitor C 1 that size is identical in parallel, C2, C2n, then the series connection of the high-pressure side of second, third basic module consists of the dc bus of multiport current transformer, with the DC side parallel of modular multi-level converter, as shown in Figure 1.
A capacitor C p2 in parallel consists of the second port of multiport current transformer of the present invention between the positive and negative terminal of the low-pressure side of the second basic module, and a capacitor C p3 in parallel consists of the 3rd port of multiport current transformer of the present invention between the positive and negative terminal of the low-pressure side of the 3rd basic module.Second, third port is DC port, connects three-phase inverter between its positive and negative terminal and can form the interchange port.
As shown in Figure 5, the first balancing circuitry 4 is made of single-phase isolating transformer and the attached H bridge of the many windings of secondary.Described single-phase isolating transformer has single input winding, 2n group output winding, and no-load voltage ratio is 1:1,1,1 ..., 1.The former limit of single-phase isolating transformer connects the AC of the first attached H bridge, and the DC side parallel of the first attached H bridge also can be connected in parallel on the low-pressure side of the second basic module 2 in the low-pressure side of the 3rd basic module 3.Each group winding of single-phase isolating transformer secondary connects the AC of an attached H bridge, altogether 2n winding and 2n H bridge, and the DC side of the individual attached H bridge of described 2n is connected in parallel on respectively on 2n the electric capacity of dc bus of multiport current transformer of the present invention.In the load of the second port, the 3rd port not simultaneously, by the single-phase isolating transformer of the many windings of secondary in the first balancing circuitry 4 to dc-link capacitance C1, C2, the voltage of C2n carries out respectively clamp, thereby so that when the second port, the 3rd port band different loads, keep the balance of voltage, make multiport current transformer of the present invention stable.
Fig. 2 is the multiport current transformer that the embodiment of the invention 2 comprises balancing circuitry 5.As shown in Figure 2, the embodiment of the invention 2 is comprised of three basic module 1,2, the 3 and second balancing circuitry 5.Three basic module 1,2,3 structure and embodiment 1 are identical.The second balancing circuitry 5 is made of an isolation link level, and the structure of isolation link level is isolated form full-bridge DC/DC converter, as shown in Figure 4.The input side of the second balancing circuitry 5 is connected in parallel on the high-pressure side of the second basic module 2, the capacitor C 1 of multiport current transformer dc bus namely, C2, on the Cn, the outlet side of the second balancing circuitry 5 is connected in parallel on the high-pressure side of the 3rd basic module 3, the capacitor C n+1 of multiport current transformer dc bus namely, Cn+2 ... on the C2n.In the load of the second port, the 3rd port not simultaneously, by the isolated form full-bridge DC/DC converter in the second balancing circuitry 5 high side voltage of the second basic module and the 3rd basic module is carried out balance, thereby so that the balance of voltage of the second port, the 3rd port, it is stable that multiport current transformer of the present invention keeps.
Three ports of multiport current transformer of the present invention are drawn by the three basic module respectively.The first port is drawn from the AC of the modular multi-level converter of the first basic module 1, and the second port is drawn from the low-pressure side of the second basic module 2, and the 3rd port is drawn from the low-pressure side of the 3rd basic module 3.Three ports all can get access to grid or load.The power of the first port equals the second port and the 3rd port power sum.If the multiport current transformer does not comprise balancing circuitry, then when laod unbalance, dc-link capacitance voltage can not keep balance, and the voltage of the second port and the 3rd port can not keep balance.First, second, third basic module for other topologys consist of as long as add the first balancing circuitry or the second balancing circuitry, also can consist of the multiport current transformer.
Fig. 6 is that the embodiment of the invention 1 is operated in power and flows to second, third port by the first port, and the simulation waveform during second, third port band different loads state.The multiport current transformer of described embodiment 1 comprises the first balancing circuitry 4.As shown in Figure 6, the modular multi-level converter of the first basic module 1 is in rectification state, power flows to second, third port by the first port, the load of second, third port is different, modular multi-level converter DC bus-bar voltage and second, third port DC bus-bar voltage keep balance, and keep constant.In the time of 0.3 second, cut off the load of the second port, can find out and cut off rear the second port 2, the increasing of the 3rd port 3 DC voltage difference, but still can keep balance.
Fig. 7 is that the embodiment of the invention 2 is operated in power and flows to second, third port by the first port, and the simulation waveform during second, third port band different loads state.Described multiport current transformer comprises the second balancing circuitry 5.As shown in Figure 7, the modular multi-level converter of the first basic module 1 is in rectification state, power flows to second, third port by the first port, the load of second, third port is different, modular multi-level converter DC bus-bar voltage and second, third port DC bus-bar voltage keep balance, and keep constant.In the time of 0.3 second, cut off the load of the second port, can find out and cut off rear second segment mouth 2, the increasing of the 3rd port 3 DC voltage difference, but still can keep balance.Can find out that by Fig. 6, Fig. 7 contrast second, third port of the first balancing circuitry 4 is poor less than second, third port voltage of the second balancing circuitry 5.
Fig. 8 be the embodiment of the invention 1 be operated in power by second, third port flow to the first port, and the simulation waveform during the different big or small power supply status of second, third port band.Affiliated multiport current transformer comprises the first balancing circuitry 4.As shown in Figure 8, the modular multi-level converter of the first basic module 1 is in inverter mode, power by second, third port flow to the first port, the direct voltage of second, third port is in different size, and keep constant, modular multi-level converter DC bus-bar voltage and second, third port DC bus-bar voltage keep balance, and keep constant.
Fig. 9 be the embodiment of the invention 2 be operated in power by second, third port flow to the first port, and simulation waveform during the different big or small power supply status of second, third port band.Affiliated multiport current transformer comprises the second balancing circuitry 5.As shown in Figure 9, the modular multi-level converter of the first basic module 1 is in inverter mode, power by second, third port flow to the first port, the direct voltage of second, third port is in different size, and keep constant, modular multi-level converter DC bus-bar voltage and second, third port DC bus-bar voltage keep balance, and keep constant.Can find out that by Fig. 8, Fig. 9 contrast second, third port of the first balancing circuitry 4 is poor less than second, third port voltage of the second balancing circuitry 5.

Claims (8)

1. multiport current transformer is characterized in that: described multiport current transformer is made of three basic module (1,2,3) and balancing circuitry; The first basic module (1) is made of modular multi-level converter; The second basic module (2) and the 3rd basic module (3) are made of (6) connection in series-parallel of a plurality of isolation link level; The first balancing circuitry (4) is made of single-phase isolating transformer and the attached H bridge of the many windings of secondary, and the second balancing circuitry (5) is made of isolation link level; Described multiport current transformer comprises three ports altogether, and described three ports lay respectively in the three basic module (1,2,3); In described three ports, the power of the first port equal the second port and the 3rd port performance number and.
2. multiport current transformer as claimed in claim 1, it is characterized in that: in the described basic module (1), modular multi-level converter has three-phase, every up and down two brachium pontis that divide mutually, each brachium pontis is by m submodule (7-1,7-2,7-m) be composed in series m 〉=4 with a brachium pontis inductance; Each submodule is by the one the second two IGBT(S1 with anti-paralleled diode, S2) be composed in series half-bridge structure, an IGBT(S1) and the 2nd IGBT(S2) two ends submodule electric capacity (Csm) in parallel after the series connection; The 2nd IGBT(S2) positive port and the negative terminal mouth that externally connects as this submodule drawn at two ends; During a plurality of submodule series connection, the positive port of a submodule connects the negative terminal mouth of another submodule.
3. multiport current transformer as claimed in claim 1, it is characterized in that: described the second basic module (2) is identical with the 3rd basic module (3) structure, consists of n 〉=4 by the connection in series-parallel of n level isolation link level; Described isolation link level is isolated form full-bridge DC/DC converter; Described isolated form full-bridge DC/DC converter is comprised of H bridge and single-phase isolating transformer of high frequency that two IGBT form, and described single-phase isolating transformer no-load voltage ratio is 1:1; The former limit of described transformer and secondary connect respectively the AC of two H bridges, the DC side of two H bridges is as the port that externally connects, the DC side of one side H bridge becomes input side, two terminals of this DC side are respectively positive and negative end, the DC side of opposite side H bridge becomes outlet side, and two terminals of this DC side are respectively positive and negative end.
4. multiport current transformer as claimed in claim 3 is characterized in that: described single-phase isolating transformer no-load voltage ratio or change according to the design needs.
5. multiport current transformer as claimed in claim 2, it is characterized in that: the input side series connection of described n level isolation link level, n 〉=4, the input side plus end that is every grade of isolation link level links to each other with the negative terminal that another grade isolation links the level input side, the outlet side of every grade of isolation link level is in parallel with the outlet side that another grade isolation links level, the plus end that is the outlet side of every grade of isolation link level is connected together, and the negative terminal of every grade of isolation link level is connected together, and consists of the second basic module (2); The series side of isolation link level is the high-pressure side of the second basic module (2), and the side in parallel of isolation link level is the low-pressure side of the second basic module (2); The 3rd basic module (3) is identical with the series-parallel system of the second basic module (2); Electric capacity that size is identical in parallel between the positive and negative terminal of input side of on high-tension side every one-level isolation link level of the second basic module (2) and the 3rd basic module (3); The high-pressure side series connection of the second basic module (2) and the 3rd basic module (3) consists of the dc bus of multiport current transformer, with the DC side parallel of modular multi-level converter.
6. multiport current transformer as claimed in claim 1, it is characterized in that: described multiport current transformer comprises the first balancing circuitry (4) or the second balancing circuitry (5).
7. multiport current transformer as claimed in claim 5, it is characterized in that: described the first balancing circuitry (4) is made of single-phase isolating transformer and the attached H bridge of the many windings of secondary; Described single-phase isolating transformer has single input winding, 2n group output winding, and the no-load voltage ratio of described isolating transformer is 1:1, and 1,1 ..., 1; The former limit of described single-phase isolating transformer connects the AC of the first attached H bridge, and the DC side parallel of the first attached H bridge is in the low-pressure side of the 3rd basic module (3), or the low-pressure side of the second basic module (2); Each group winding of single-phase isolating transformer secondary connects the AC of an attached H bridge; The DC side of 2n described attached H bridge is connected in parallel on respectively on 2n the electric capacity of dc bus of multiport current transformer of the present invention.
8. multiport current transformer as claimed in claim 5 is characterized in that: described the second balancing circuitry (5) is made of an isolation link level, and isolation link level is isolated form full-bridge DC/DC converter; The input side of the second balancing circuitry (5) is connected in parallel on the high-pressure side of the second basic module (2), and the outlet side of the second balancing circuitry (5) is connected in parallel on the high-pressure side of the 3rd basic module (3).
CN2012103763710A 2012-09-29 2012-09-29 Multi-port current transformer Pending CN102904420A (en)

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CN106385022A (en) * 2016-09-09 2017-02-08 国网北京市电力公司 Energy router
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CN109167528A (en) * 2018-08-30 2019-01-08 中国科学院电工研究所 High voltage direct current transmission device and its control method

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CN106253728A (en) * 2016-08-15 2016-12-21 上海交通大学 Multi-port modular multi-level converter for Multi-end flexible direct current transmission application
CN106253728B (en) * 2016-08-15 2019-02-22 上海交通大学 Multi-port modular multi-level converter for Multi-end flexible direct current transmission application
CN106385022A (en) * 2016-09-09 2017-02-08 国网北京市电力公司 Energy router
CN107134802A (en) * 2017-06-29 2017-09-05 西安交通大学 A kind of flexible multimode switch topology in the port of middle pressure three based on electric power electric transformer
CN107134802B (en) * 2017-06-29 2021-01-19 西安交通大学 Medium-voltage three-port flexible multi-state switch topology based on power electronic transformer
CN109167528A (en) * 2018-08-30 2019-01-08 中国科学院电工研究所 High voltage direct current transmission device and its control method

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Application publication date: 20130130