CN104078195A - Three-phase coupling reactor and converter - Google Patents
Three-phase coupling reactor and converter Download PDFInfo
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- CN104078195A CN104078195A CN201410306862.7A CN201410306862A CN104078195A CN 104078195 A CN104078195 A CN 104078195A CN 201410306862 A CN201410306862 A CN 201410306862A CN 104078195 A CN104078195 A CN 104078195A
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Abstract
The invention discloses a three-phase coupling reactor and a converter. The three-phase coupling reactor comprises an iron core and six windings, the iron core comprises an upper iron yoke, a lower iron yoke, at least one first iron core post without a gas gap and three second iron core posts with gas gaps, wherein the first iron core post and the second iron core posts are located between the upper iron yoke and the lower iron yoke; two windings wind each second iron core post, and the ends of the two windings on the same second iron core post in different names are connected in a short circuit mode. According to the three-phase coupling reactor and converter, the zero sequence circulating current impedance of the converter system is increased through the coupling between windings, and accordingly the problem of uneven current of parallel power modules due to zero sequence circulating current is effectively solved.
Description
Technical field
The present invention relates to current transformer field, more particularly, relate to a kind of for suppressing the coupling reactor of current transformer zero sequence circulation.
Background technology
Along with the development of power electronic technology and product, large capacity current transformer is progressively used widely.In large capacity current transformer, generally improve the current capacity of switching device by the parallel connection of the module such as IGBT, MOSFET.But, the factors such as the output characteristic of power model in parallel, transfer characteristic, gate electrode drive signals time delay often there are differences, these differences produce zero sequence circulation by causing between power model in parallel, make power model in parallel in the time of Static and dynamic, cannot reach desirable equal stream mode, thereby limited the result of use of the switching device after parallel connection.
For suppressing another zero sequence circulation, conventionally increase isolating transformer or adopt suitable software scenario at the ac output end of two power models of parallel connection, solve the problem of not current-sharing between power model in parallel.But in such scheme, the isolating transformer of increase increases the volume, weight, cost, the loss that make converter system greatly; The use of zero sequence circulation control software can increase the complexity of control system.
Summary of the invention
The technical problem to be solved in the present invention is, for suppressing in the above-mentioned current transformer with two power models, zero sequence circulation cost is high, the problem of relative complex, and a kind of coupling reactor and current transformer are provided.
The technical scheme that the present invention solves the problems of the technologies described above is, a kind of coupling reactor is provided, comprise iron core and six windings, described iron core comprises upper yoke, lower yoke and lays respectively at least one the first iron core column without air gap between described upper yoke and lower yoke and the second iron core column that three have an air gap; Described in each, in the second iron core column, be arranged with respectively two windings, and one group of different name end short circuit of two windings in same the second iron core column.
In coupling reactor of the present invention, described in each, the second iron core column comprises the upper and lower joining, and described upper and lower has respectively air gap; Two windings difference winding in this second iron core column is in upper and lower.
In coupling reactor of the present invention, two windings in same the second iron core column side by side winding on same section of this second iron core column.
In coupling reactor of the present invention, described iron core comprises two the first iron core column without air gap, described the first iron core column and the second iron core column be arranged in parallel and described three the second iron core column between two the first iron core column without air gap.
In coupling reactor of the present invention, described the first iron core column and the second iron core column be arranged in parallel, and described three the second iron core column are positioned at the same side of the first iron core column.
The present invention also provides a kind of current transformer, comprises at least two power models in parallel, and this current transformer also comprises the coupling reactor of the output that is concatenated into described power model; Described coupling reactor comprises iron core and six windings, and described iron core comprises upper yoke, lower yoke and lays respectively at least one the first iron core column without air gap between described upper yoke and lower yoke and the second iron core column that three have an air gap; Described in each, in the second iron core column, be arranged with respectively two windings, and one group of different name end short circuit of two windings in same the second iron core column; The different name end of the short circuit of two windings in same the second iron core column is connected respectively to the output of a power model as the output of current transformer, the independently different name end of each winding.
In current transformer of the present invention, described in each, the second iron core column comprises the upper and lower joining, and described upper and lower has respectively air gap; Two windings difference winding in this second iron core column is in upper and lower.
In current transformer of the present invention, the first winding in same the second iron core column and the second winding are wound on same section of this second iron core column side by side.
In current transformer of the present invention, described iron core comprises two the first iron core column without air gap, described the first iron core column and the second iron core column be arranged in parallel and described three the second iron core column between two the first iron core column without air gap.
In current transformer of the present invention, described the first iron core column and the second iron core column be arranged in parallel, and described three the second iron core column are positioned at the same side of the first iron core column.
Coupling reactor of the present invention and current transformer, increase the zero sequence circulation impedance of converter system by the coupling between winding, thereby effectively solve the problem that causes not current-sharing of power model in parallel due to zero sequence circulation.The present invention also provides low magnetic resistance loop by the magnetic flux producing to common mode current without air-gap iron core post, suppresses the common mode current that current transformer when operation produces, and can greatly reduce volume, the cost of converter system.
Brief description of the drawings
Fig. 1 is the schematic diagram of coupling reactor the first embodiment of the present invention.
Fig. 2 is the schematic diagram of coupling reactor the second embodiment of the present invention.
Fig. 3 is the schematic diagram of coupling reactor the 3rd embodiment of the present invention.
Fig. 4 is the schematic diagram of coupling reactor the 4th embodiment of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Coupling reactor of the present invention is applied to the current transformer with two power models in parallel, can suppress the zero sequence circulation that power model in parallel produces because of differences such as output characteristic, transfer characteristic, gate electrode drive signals time delays.This coupling reactor comprises iron core and six windings, above-mentioned iron core comprise upper yoke, lower yoke and lay respectively at upper yoke and lower yoke between at least one the first iron core column without air gap and three the second iron core column that have an air gap; In each second iron core column, be arranged with respectively two windings, and one group of different name end short circuit of two windings in same the second iron core column.
Because two windings in same the second iron core column exist mutual inductance, in the time that coupling reactor is concatenated into the output of power model in parallel in current transformer, when being used to common reactor, the zero sequence circulation impedance that makes system obviously increases, the effect that suppresses zero sequence circulation is more obvious, thereby improves the current-sharing effect of power model in parallel.
As shown in Figure 1, be the schematic diagram of coupling reactor the first embodiment of the present invention.Coupling reactor in the present embodiment comprises iron core and six winding L 1_A, L1_B, L1_C, L2_A, L2_B, L2_C, and above-mentioned iron core comprises upper yoke, lower yoke (upper yoke, lower yoke are all permeability magnetic material) and lays respectively at two the first iron core column 11 without air gap between upper yoke and lower yoke and the second iron core column 12 that three have an air gap.Three the second iron core column 12 and two the first iron core column 11 be arranged in parallel, and three the second iron core column 12 are all between two the first iron core column 11.In the time of specific implementation, above-mentioned upper yoke, lower yoke the first iron core column 11 and the second iron core column 12 can be structure as a whole.
Above-mentioned each second iron core column 12 comprises the upper and lower joining, and upper and lower has respectively air gap.Six winding L 1_A, L1_B, L1_C, L2_A, L2_B, L2_C respectively winding in three the second iron core column 12, and two winding L 1_A in same the second iron core column 12 and L2_A, L1_B and L2_B, L1_C and L2_C respectively winding to the upper and lower of the second iron core column 12.One group of different name end short circuit of winding L 1_A in same the second iron core column 12 and L2_A, L1_B and L2_B, L1_C and L2_C.
When above-mentioned coupling reactor is concatenated into power model output in parallel (i.e. three winding L 1_A, L1_B, the independent terminals of L1_C are connected to the output of a power model, other three winding L 2_A, L2_B, the independent terminals of L2_C are connected to the output of another power model, the different name link X_A of two windings, X_B, X_C is connected to load) time, due to winding L 1_A and L2_A, L1_B and L2_B, there is respectively mutual inductance M in L1_C and L2_C, can make the zero sequence circulation impedance of system use common reactor time, increase, the effect that suppresses zero sequence circulation is more obvious, make the current-sharing better effects if of power model in parallel.And in the time having common mode current to flow through in winding L 1_A, L1_B, L1_C, L2_A, L2_B, L2_C, the first iron core column 11 via high magnetic permeability is formed loop by the magnetic flux that common mode current produces, and realizes the inhibition to common mode current.
As shown in Figure 2, in the second embodiment of coupling reactor of the present invention, iron core is made up of upper yoke, lower yoke, three the second iron core column 22 and first iron core column 21, wherein the second iron core column 22 and the first iron core column 21 are all connected between upper yoke and lower yoke, and without air gap, in each second iron core column 22, there is air gap in the first iron core column 21.Above-mentioned the second iron core column 22 and the first iron core column 21 be arranged in parallel, and three the second iron core column 22 are positioned at the same side of the first iron core column 21.
Similarly, each second iron core column 22 comprises the upper and lower joining, and upper and lower has respectively air gap.Six winding L 1_A, L1_B, L1_C, L2_A, L2_B, L2_C respectively winding in three the second iron core column 22, and two winding L 1_A in same the second iron core column 22 and L2_A, L1_B and L2_B, L1_C and L2_C respectively winding to the upper and lower of the second iron core column 22.One group of different name end short circuit of winding L 1_A in same the second iron core column 22 and L2_A, L1_B and L2_B, L1_C and L2_C.
The zero sequence circulation that coupling reactor in the present embodiment can be realized power model in parallel equally suppresses, and compared with embodiment in Fig. 1, owing to having lacked first iron core column 21, the temperature rise meeting of this coupling reactor is relatively high.
As shown in Figure 3, be the schematic diagram of the 3rd embodiment of coupling reactor of the present invention.Coupling reactor in the present embodiment comprises iron core and six winding L 1_A, L1_B, L1_C, L2_A, L2_B, L2_C equally, and above-mentioned iron core comprises upper yoke, lower yoke (upper yoke, lower yoke are all permeability magnetic material) and lays respectively at two the first iron core column 31 without air gap between upper yoke and lower yoke and the second iron core column 32 that three have an air gap.Three the second iron core column 32 and two the first iron core column 31 be arranged in parallel, and three the second iron core column 32 are all between two the first iron core column 31.
Six winding L 1_A, L1_B in the present embodiment, L1_C, L2_A, L2_B, L2_C winding (each second iron core column 32 is arranged with two windings) in three the second iron core column 32 respectively, and two winding L 1_A and L2_A, L1_B and L2_B, L1_C in same the second iron core column 32 and L2_C adopts and same section to the second iron core column 32 around mode winding.One group of different name end short circuit of winding L 1_A in same the second iron core column 32 and L2_A, L1_B and L2_B, L1_C and L2_C.
The zero sequence circulation that coupling reactor in the present embodiment can be realized power model in parallel equally suppresses, and compared with embodiment in Fig. 1,2, its volume can dwindle greatly.
As shown in Figure 4, in the 4th embodiment of coupling reactor of the present invention, iron core is made up of upper yoke, lower yoke, three the second iron core column 42 and first iron core column 41, wherein the second iron core column 42 and the first iron core column 41 are all connected between upper yoke and lower yoke, and without air gap, in each second iron core column 42, there is air gap in the first iron core column 41.Above-mentioned the second iron core column 42 and the first iron core column 41 be arranged in parallel, and three the second iron core column 42 are positioned at the same side of the first iron core column 41.
Each in the present embodiment same employing of the second iron core column 42 is also arranged with two windings around mode, and one group of different name end short circuit of these two windings.
The zero sequence circulation that coupling reactor in the present embodiment can be realized power model in parallel equally suppresses, and compared with embodiment in Fig. 3, owing to having lacked first iron core column 31, the temperature rise meeting of this coupling reactor is relatively high.
Above-mentioned coupling reactor can directly apply to the current transformer that comprises at least two power models in parallel.Now, this current transformer also comprises the coupling reactor of the output that is concatenated into power model, and this coupling reactor comprises iron core and six windings, wherein iron core comprises upper yoke, lower yoke and lays respectively at least one the first iron core column without air gap between described upper yoke and lower yoke and the second iron core column that three have an air gap; Described in each, in the second iron core column, be arranged with respectively two windings, and one group of different name end short circuit of two windings in same the second iron core column; The different name end of the short circuit of two windings in same the second iron core column is connected respectively to the output of a power model as the output of current transformer, the independently different name end of each winding.
In above-mentioned current transformer, each second iron core column comprises the upper and lower joining, and upper and lower has respectively air gap; Two windings difference winding in this second iron core column is in upper and lower.In addition, the first winding in each second iron core column and the second winding also can be wound on same section of this second iron core column side by side.
Above-mentioned iron core can comprise two the first iron core column without air gap, the first iron core column and the second iron core column be arranged in parallel and three the second iron core column between two the first iron core column without air gap.In addition, iron core also can only comprise first iron core column, and the first iron core column and the second iron core column be arranged in parallel, and three the second iron core column are positioned at the same side of the first iron core column.
The above; only for preferably embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (10)
1. a coupling reactor, it is characterized in that: comprise iron core and six windings, described iron core comprises upper yoke, lower yoke and lays respectively at least one the first iron core column without air gap between described upper yoke and lower yoke and the second iron core column that three have an air gap; Described in each, in the second iron core column, be arranged with respectively two windings, and one group of different name end short circuit of two windings in same the second iron core column.
2. coupling reactor according to claim 1, it is characterized in that: described in each, the second iron core column comprises the upper and lower joining, and described upper and lower has respectively air gap; Two windings difference winding in this second iron core column is in upper and lower.
3. coupling reactor according to claim 1, is characterized in that: two windings in same the second iron core column side by side winding on same section of this second iron core column.
4. according to the coupling reactor described in any one in claim 1-3, it is characterized in that: described iron core comprises two the first iron core column without air gap, described the first iron core column and the second iron core column be arranged in parallel and described three the second iron core column between two the first iron core column without air gap.
5. according to the coupling reactor described in any one in claim 1-3, it is characterized in that: described the first iron core column and the second iron core column be arranged in parallel, and described three the second iron core column are positioned at the same side of the first iron core column.
6. a current transformer, comprises at least two power models in parallel, it is characterized in that: this current transformer also comprises the coupling reactor of the output that is concatenated into described power model; Described coupling reactor comprises iron core and six windings, and described iron core comprises upper yoke, lower yoke and lays respectively at least one the first iron core column without air gap between described upper yoke and lower yoke and the second iron core column that three have an air gap; Described in each, in the second iron core column, be arranged with respectively two windings, and one group of different name end short circuit of two windings in same the second iron core column; The different name end of the short circuit of two windings in same the second iron core column is connected respectively to the output of a power model as the output of current transformer, the independently different name end of each winding.
7. current transformer according to claim 6, is characterized in that: described in each, the second iron core column comprises the upper and lower joining, and described upper and lower has respectively air gap; Two windings difference winding in this second iron core column is in upper and lower.
8. current transformer according to claim 6, is characterized in that: the first winding in same the second iron core column and the second winding are wound on same section of this second iron core column side by side.
9. according to the current transformer described in any one in claim 6-8, it is characterized in that: described iron core comprises two the first iron core column without air gap, described the first iron core column and the second iron core column be arranged in parallel and described three the second iron core column between two the first iron core column without air gap.
10. according to the current transformer described in any one in claim 6-8, it is characterized in that: described the first iron core column and the second iron core column be arranged in parallel, and described three the second iron core column are positioned at the same side of the first iron core column.
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| CN104882253A (en) * | 2015-04-24 | 2015-09-02 | 上海意兰可电力电子设备有限公司 | Three-phase four-limb conjugated electric reactor |
| CN106783059A (en) * | 2016-12-30 | 2017-05-31 | 上海意兰可电力电子设备有限公司 | Three-phase equalizing reactor |
| DE102017110059A1 (en) * | 2017-05-10 | 2018-11-15 | Manfred Schmelzer Gmbh | Multi-phase push-pull power choke |
| CN110310801A (en) * | 2019-07-19 | 2019-10-08 | 东莞市大忠电子有限公司 | A kind of integrated three-phase common mode inductance of 5G |
| US10790697B2 (en) | 2016-06-07 | 2020-09-29 | Ge Energy Power Conversion Technology Limited | System for converting electrical energy supplied by a network and a conversion method implemented by means of such a conversion system |
| CN112816840A (en) * | 2021-01-29 | 2021-05-18 | 国网陕西省电力公司电力科学研究院 | Cable line alternating current voltage withstand test method and system based on three-phase shunt reactor |
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| CN112816840B (en) * | 2021-01-29 | 2023-07-21 | 国网陕西省电力公司电力科学研究院 | Cable line alternating-current withstand voltage test method and system based on three-phase shunt reactor |
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Effective date of registration: 20191126 Address after: 215000 No.16, Youxiang Road, Yuexi, Wuzhong District, Suzhou City, Jiangsu Province Patentee after: Suzhou Huichuan Technology Co.,Ltd. Address before: 518101 Guangdong city of Shenzhen province Baoan District no 70 District Liu Xian two road Hongwei Dong Industrial Zone E Patentee before: Shenzhen Huichuan Technology Co., Ltd. |