CN110829430B - Harmonic elimination system of phasor transformer junction line - Google Patents
Harmonic elimination system of phasor transformer junction line Download PDFInfo
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- CN110829430B CN110829430B CN201810920653.XA CN201810920653A CN110829430B CN 110829430 B CN110829430 B CN 110829430B CN 201810920653 A CN201810920653 A CN 201810920653A CN 110829430 B CN110829430 B CN 110829430B
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- 230000008030 elimination Effects 0.000 title claims abstract description 17
- 238000003379 elimination reaction Methods 0.000 title claims abstract description 17
- 230000010363 phase shift Effects 0.000 claims abstract description 68
- 238000010248 power generation Methods 0.000 claims abstract description 24
- 230000009466 transformation Effects 0.000 claims description 20
- 238000002955 isolation Methods 0.000 claims description 9
- 230000000694 effects Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention relates to a harmonic elimination system of a junction line of a phasor transformer, which is electrically connected and arranged between a power generation system and at least one load, and comprises: the first transformer group is provided with a first transformer, a second transformer and a third transformer which are mutually connected in parallel, wherein the phase shift of the second transformer is different from the phase shift of the first transformer by a first angle, the phase shift of the third transformer is different from the phase shift of the first transformer by a second angle, and the phase shift of the second transformer is different from the phase shift of the third transformer. Therefore, the transformer with the phase shift difference is arranged in the power system, so that the effect of eliminating harmonic waves is achieved.
Description
Technical Field
The present disclosure relates to harmonic cancellation systems, and particularly to a harmonic cancellation system for a junction line of a phasor transformer.
Background
At present, due to the electronization of household electrical appliances and the large use of nonlinear loads such as converters (inverters), inverters (inverters) and rectifiers (rectifiers), the harmonic problem is increasingly serious, and even the capacitor of the client is burnt out and damaged.
The fundamental cause of the generation of harmonics is waveform distortion caused by nonlinear characteristics of part of the equipment and the load in the power generation system, so that the applied voltage and the generated current do not have a linear relationship.
Therefore, when the power generation system supplies power to nonlinear devices and loads, the devices or loads transmit (such as a transformer), convert (such as an ac-dc converter) and absorb (such as an arc furnace) the fundamental wave energy supplied by the generator of the system, and simultaneously convert part of the fundamental wave energy into harmonic wave energy, and send a large amount of harmonic waves back to the power generation system, so that the sinusoidal waveform of the power generation system is distorted and the power quality is reduced, and the problem of generating the harmonic waves cannot be ignored.
However, as shown in the schematic flow diagram of the power generation system in fig. 1, the whole power generation system can be roughly divided into a power generation system a, a high-voltage power transformation device B, a low-voltage power transformation device C and a load D, wherein the high-voltage power transformation device B and the low-voltage power transformation device C are all provided with a transformer 20 (e.g., dy 11) with the same phase shift, and a filter 30, such as a passive filter or an active filter (as shown in the schematic flow diagram of the prior art transformer configuration in fig. 2), is installed between the high-voltage power transformation device B and the low-voltage power transformation device C in order to eliminate the generation of harmonics, but the passive filter can only filter out a wave with a certain value and the active filter needs to readjust parameters due to environmental changes (such as when the system is replaced), but the active filter has a function of automatically adjusting parameters, has a high installation cost and has a limit value, and if the limit value is exceeded, the filter cannot be filtered.
In view of the above, the present inventors have diligently studied and conceived for many years to design a harmonic cancellation system for junction lines of a phasor transformer, so as to improve the defects of the prior art and further enhance industrial implementation and utilization.
Disclosure of Invention
The present invention provides a harmonic cancellation system for a junction line of a phasor transformer, wherein a harmonic cancellation system for a single-stage-phasor transformer junction line or a harmonic cancellation system for a double-stage-phasor transformer junction line is installed in a high-voltage power transformation device, a low-voltage power transformation device or both between a power generation system and a load, and the transformer group has three transformers which are arranged in parallel and have phase shift differences, so that the effect of eliminating harmonic waves can be achieved by arranging the transformers with phase shift differences in a power system, and transformer combinations with different phase shift differences can be matched according to different electrical characteristics. In addition, when the transformers are isolation transformers, regional electrical protection can be achieved, and the effect of eliminating harmonic waves is better.
Therefore, in order to achieve the above object, the present invention is a harmonic cancellation system of a junction line of a phasor transformer, electrically connected between a power generation system and at least one load, comprising: the first transformer group is provided with a first transformer, a second transformer and a third transformer which are mutually connected in parallel, wherein the phase shift of the second transformer is different from the phase shift of the first transformer by a first angle, the phase shift of the third transformer is different from the phase shift of the first transformer by a second angle, and the phase shift of the second transformer is different from the phase shift of the third transformer.
The harmonic elimination system for the junction line of the phasor transformer is characterized in that the first transformer set is arranged on a high-voltage power transformation device or a low-voltage power transformation device between the power generation system and the load.
The harmonic elimination system for the junction line of the phasor transformer is characterized in that the first transformer groups are arranged in the low-voltage power transformation device in pairs, the first transformers of the first transformer groups are electrically connected to the same load, the second transformers of the first transformer groups are electrically connected to the same load, and the third transformers of the first transformer groups are electrically connected to the same load.
The harmonic elimination system of the phase-change transformer junction line further comprises a second transformer set arranged on the low-voltage power transformation device when the first transformer set is arranged on the high-voltage power transformation device, and the second transformer set is provided with a fourth transformer, a fifth transformer and a sixth transformer which are mutually arranged in parallel, wherein the phase shift of the fifth transformer is different from the phase shift of the fourth transformer by a first angle, the phase shift of the sixth transformer is different from the phase shift of the fourth transformer by a second angle, and the phase shift of the fifth transformer is different from the phase shift of the sixth transformer.
The harmonic elimination system for the junction line of the phasor transformer is characterized in that the second transformer groups are arranged in the low-voltage power transformation device in pairs, the fourth transformers of the second transformer groups are electrically connected to the same load, the fifth transformers of the second transformer groups are electrically connected to the same load, and the sixth transformers of the second transformer groups are electrically connected to the same load.
The harmonic elimination system of the junction line of the phasor transformer is characterized in that the first angle and the second angle are 30 degrees or 60 degrees.
The harmonic elimination system for the junction line of the phasor transformer comprises a first transformer, a second transformer, a third transformer, a fourth transformer, a fifth transformer and a sixth transformer which are all three-phase transformers.
The harmonic elimination system for the junction line of the phasor transformer comprises a first transformer, a second transformer, a third transformer, a fourth transformer, a fifth transformer and a sixth transformer which are all isolation transformers.
The harmonic elimination system of the junction line of the phasor transformer, wherein the isolation transformer is an amorphous isolation transformer.
The harmonic elimination system of the phasor transformer junction line is characterized in that the first transformer, the second transformer and the third transformer are all K4 transformers, and the fourth transformer, the fifth transformer and the sixth transformer are all K20 transformers.
The harmonic elimination system of the phasor transformer junction line is characterized in that the first transformer, the second transformer and the third transformer are respectively K4 three-phase amorphous isolation transformers of Dy1, dz0 and Dz2, and the fourth transformer, the fifth transformer and the sixth transformer of the second transformer group are respectively K20 three-phase amorphous isolation transformers of Dy1, dz0 and Dz 2.
Drawings
Fig. 1 is a schematic and schematic flow chart of a power generation system.
Fig. 2 is a schematic diagram of a prior art transformer configuration architecture.
Fig. 3 is a schematic diagram of a first configuration architecture of a harmonic cancellation system of a junction line of a phasor transformer according to the present invention.
Fig. 4 is a schematic diagram of a second configuration architecture of the harmonic cancellation system of the junction line of the phasor transformer according to the present invention.
Fig. 5 is a schematic diagram of a third configuration architecture of a harmonic cancellation system of a junction line of a phasor transformer according to the present invention.
Fig. 6 is a schematic diagram of a fourth configuration architecture of a harmonic cancellation system of a junction line of a phasor transformer according to the present invention.
[ symbolic description ]
10a, 10b, 10c, 10d harmonic cancellation system
11 first transformer group
111 first transformer
112 second transformer
113 third transformer
12 second transformer group
121 fourth transformer
122 fifth transformer
123 sixth transformer
20 transformer
30 filter
A power generation system
B high-voltage power transformation device
C low-voltage power transformation device
D load
Detailed Description
The following describes embodiments of the present invention with reference to fig. 3, 4, 5, and 6. The description is not intended to limit the embodiments of the invention, but is one example of the invention.
Referring to fig. 3 to 5, the harmonic cancellation system 10a of the present invention is disposed between a power generation system a and at least one load D, and includes: the first transformer 11 has a first transformer 111, a second transformer 112 and a third transformer 113 arranged in parallel, wherein the phase shift of the second transformer 112 is different from the phase shift of the first transformer 111 by a first angle, and the phase shift of the third transformer 113 is different from the phase shift of the first transformer 111 by a second angle, but the phase shift of the second transformer 112 is different from the phase shift of the third transformer 113.
In addition, the first angle and the second angle are 30 degrees or 60 degrees, for example, the first transformer 111, the second transformer 112, and the third transformer 113 of the first transformer 11 may be Dy1, dz0, dz2, respectively, the phase shift of the second transformer 112 is 30 degrees less than the phase shift of the first transformer 111, the phase shift of the third transformer 113 is 30 degrees more than the phase shift of the first transformer 111, or the first transformer 111, the second transformer 112, and the third transformer 113 of the first transformer 11 may be Dz0, dy11, dz2, respectively, the phase shift of the second transformer 112 is 30 degrees less than the phase shift of the first transformer 111, and the phase shift of the third transformer 113 is 60 degrees more than the phase shift of the first transformer 111.
Next, the first transformer 11 is disposed between the power generation system a and the load D (such as the harmonic cancellation system 10a shown in fig. 3) or the low voltage transformer C (such as the harmonic cancellation system 10B shown in fig. 4), so that the total harmonic distortion (Total Harmonic Distortion, THD) at the high voltage side is reduced by the offset of the phase shift between the first transformer 111, the second transformer 112 and the third transformer 113, and the harmonic cancellation effect can be achieved by replacing the prior art transformer with the same phase shift transformer with the first transformer 11.
However, as shown in the harmonic cancellation system 10C of fig. 5, if the first transformer 11 is disposed at both the high voltage transformer B and the low voltage transformer C, the resultant harmonic value measured at the high voltage side is lower, in other words, the harmonic cancellation effect is better, than that of the high voltage transformer B or the low voltage transformer C alone.
Referring to fig. 4 and fig. 5, referring to the harmonic cancellation systems 10b and 10C, when the first transformer groups 11 are disposed in the low-voltage transformer device C in pairs, the first transformers 111 of the first transformer groups 11 are electrically connected to the same load D, the second transformers 112 of the first transformer groups 11 are electrically connected to the same load D, and the third transformers 113 of the first transformer groups 11 are electrically connected to the same load D.
In addition, referring to the harmonic cancellation system 10d of fig. 6, when the first transformer 11 is disposed in the high-voltage transformer B, the harmonic cancellation system further includes a second transformer 12 disposed in the low-voltage transformer C, and the second transformer 12 has a fourth transformer 121, a fifth transformer 122 and a sixth transformer 123 disposed in parallel with each other, wherein the phase shift of the fifth transformer 122 is different from the phase shift of the fourth transformer 121 by the first angle, and the phase shift of the sixth transformer 123 is different from the phase shift of the fourth transformer 121 by the second angle, but the phase shift of the fifth transformer 122 is different from the phase shift of the sixth transformer 123.
In addition, the first angle and the second angle are 30 degrees or 60 degrees, for example, the fourth transformer 121, the fifth transformer 122 and the sixth transformer 123 of the second transformer set 12 may be Dy1, dz0, dz2, respectively, the phase shift of the fifth transformer 122 is 30 degrees less than the phase shift of the first transformer 121, the phase shift of the third transformer 123 is 30 degrees more than the phase shift of the first transformer 121, or the fourth transformer 121, the fifth transformer 122 and the sixth transformer 123 of the second transformer set 12 may be Dz0, dy11, dz2, respectively, the phase shift of the second transformer 122 is 30 degrees less than the phase shift of the first transformer 121, and the phase shift of the third transformer 123 is 60 degrees more than the phase shift of the first transformer 121.
Moreover, the second transformer groups 12 are disposed in pairs on the low-voltage transformer device C, the fourth transformers 121 of the second transformer groups 12 are electrically connected to the same load D, the fifth transformers 122 of the second transformer groups 12 are electrically connected to the same load D, and the sixth transformers 123 of the second transformer groups 12 are electrically connected to the same load D.
In addition, the first transformer 111, the second transformer 112, the third transformer 113, the fourth transformer 121, the fifth transformer 122 and the sixth transformer 123 may be three-phase transformers, isolated transformers, especially isolated transformers, which may be amorphous, so that the present invention uses three-phase amorphous isolated transformers.
Further, since the K value is a value defining a Harmonic Content (Harmonic Content) in the power system, the larger the K value is, the more the Harmonic Content is represented, so that in order to eliminate the Harmonic wave reflected from the load D to the power generation system a, the first transformer 111, the second transformer 112, the third transformer 113, the fourth transformer 121, the fifth transformer 122 and the sixth transformer 123 can be selected from transformers (e.g., K4 transformer, K13 transformer, K20 transformer) having a K value greater than the K value measured by the load D.
For example, if the K value measured by the load D is about 11.9, and the present invention is a harmonic cancellation system of a single-stage-phasor transformer junction (as shown in fig. 3 and 4), since the low-voltage transformer C shown in fig. 3 and the high-voltage transformer B shown in fig. 4 are not provided with the characteristic of eliminating harmonics, the first transformer 111, the second transformer 112 and the third transformer 113 included in the first transformer group 11 relatively arranged between the high-voltage transformer B and the low-voltage transformer C may be selected from transformers (e.g. K4 transformer, K13 transformer and K20 transformer) having a K value greater than the K value measured by the load D; however, when the present invention is a harmonic cancellation system of a dual-stage-phasor transformer junction line (as shown in fig. 5 and 6), since the first transformer 11 including the first transformer 111, the second transformer 112 and the third transformer 113 is disposed in the high voltage transformer B and the low voltage transformer C as shown in fig. 5, the transformers (e.g. K4 transformer, K13 transformer and K20 transformer) having K values larger than K values measured by the load D can be selected, but if the first transformer 11 including the first transformer 111, the second transformer 112 and the third transformer 113 is disposed in the high voltage transformer B and the second transformer 12 including the fourth transformer 121, the fifth transformer 122 and the sixth transformer 123 is disposed in the low voltage transformer C, the fourth transformer 121, the fifth transformer 122 and the first transformer 11 of the second transformer 12 disposed in the low voltage transformer C is disposed closer to the load D, and the first transformer 11 and the second transformer 11 of the first transformer 12 are also selected, and the second transformer 11 of the first transformer 11 and the second transformer 11 of the second transformer 13 of the second transformer 113 are selected, and the harmonic cancellation system is also performed in the harmonic cancellation system of fig. 6.
Finally, as illustrated in the preferred embodiment, when the first transformer 111, the second transformer 112, and the third transformer 113 of the first transformer 11 are K4 amorphous isolated transformers such as Dy1, dz0, dz2, and the like, respectively, and are disposed in the high voltage transformer B as shown in fig. 3, a harmonic cancellation system of a single-stage-phasor transformer junction line is formed, the total harmonic distortion measured on the secondary side of the third transformer 113 of the K4 amorphous isolated transformer of Dz2 is 28.71%, the total harmonic distortion measured on the primary side of the third transformer 113 is 27.84%, and the total harmonic distortion is still 25% or more, but the total harmonic distortion measured on the high voltage side of the first transformer 111 and the second transformer 112 of the K4 amorphous isolated transformers such as Dy1, dz0, and the like is 0.50%, so that the power consumption of the power generation system is greatly reduced, and the power consumption of the power generation system is prevented from being damaged due to the sine wave distortion caused by the fact that the load D is reduced.
In addition, when the first transformer 111, the second transformer 112, and the third transformer 113 of the first transformer 11 are respectively K4 amorphous isolated transformers such as Dy1, dz0, dz2, etc., and the fourth transformer 121, the fifth transformer 122, and the sixth transformer 123 of the second transformer 11 are respectively K20 amorphous isolated transformers such as Dy1, dz0, dz2, etc., and are respectively disposed on the high voltage transformer B and the low voltage transformer C as shown in fig. 6, a harmonic cancellation system of a dual-layer-phase-change transformer junction line is formed, a total harmonic distortion ratio is 25.75% on the second side of the sixth transformer 123 of the K20 amorphous isolated transformer of Dz2 of the low voltage transformer C, a total harmonic distortion ratio is 25.16% on the first side of the sixth transformer 123, a total harmonic distortion ratio is 9.36% on the second side of the third transformer 113, a total harmonic distortion ratio is 9.36% on the third transformer 113, and a total harmonic distortion ratio is only on the first side of the third transformer 113, and a loss of the total harmonic distortion ratio is reduced to 30% is avoided, and further, the power generation system is prevented from being damaged by the total harmonic distortion ratio is reduced by the amplitude of the power generation system, and the total distortion ratio is reduced by the total harmonic distortion ratio of the system is reduced by 30.
The invention provides a harmonic elimination system of a phase-change transformer junction line, which is characterized in that a harmonic elimination system of a single-layer-phase-change transformer junction line or a harmonic elimination system of a double-layer-phase-change transformer junction line is formed by installing a transformer set in a high-voltage power transformation device and a low-voltage power transformation device or both between a power generation system and a load, and the transformer set is provided with three transformers which are arranged in parallel and have phase shift differences, so that the effect of eliminating harmonic waves can be achieved by arranging the transformers with the phase shift differences in a power system, and transformer combinations with different phase shift differences can be matched according to different electrical characteristics. In addition, when the transformers are isolation type transformers, regional electrical protection can be achieved, and the effect of eliminating harmonic waves is improved.
Claims (7)
1. A harmonic cancellation system for a junction line of a phasor transformer, electrically connected between a power generation system and at least one load, comprising:
the first transformer group is provided with a first transformer, a second transformer and a third transformer which are mutually connected in parallel, wherein the phase shift of the second transformer is different from the phase shift of the first transformer by a first angle, the phase shift of the third transformer is different from the phase shift of the first transformer by a second angle, and the phase shift of the second transformer is different from the phase shift of the third transformer;
when the first transformer set is arranged on a high-voltage power transformation device between the power generation system and the load, the harmonic elimination system further comprises a second transformer set arranged on a low-voltage power transformation device between the power generation system and the load, and the second transformer set is provided with a fourth transformer, a fifth transformer and a sixth transformer which are mutually arranged in parallel, wherein the phase shift of the fifth transformer is different from the phase shift of the fourth transformer by the first angle, the phase shift of the sixth transformer is different from the phase shift of the fourth transformer by the second angle, but the phase shift of the fifth transformer is different from the phase shift of the sixth transformer; the first angle and the second angle are 30 degrees or 60 degrees.
2. The harmonic cancellation system of a phasor transformer junction line of claim 1, wherein the second transformer groups are disposed in the low voltage transformer device in pairs, and fourth transformers of the second transformer groups are electrically connected to the same load, fifth transformers of the second transformer groups are electrically connected to the same load, and sixth transformers of the second transformer groups are electrically connected to the same load.
3. The harmonic cancellation system of claim 1 or 2, wherein the first transformer, the second transformer, the third transformer, the fourth transformer, the fifth transformer and the sixth transformer are all three-phase transformers.
4. The harmonic cancellation system of claim 1 or 2, wherein the first transformer, the second transformer, the third transformer, the fourth transformer, the fifth transformer and the sixth transformer are all isolated transformers.
5. The harmonic cancellation system of a phasor transformer junction line of claim 4 wherein the isolation transformer is an amorphous isolation transformer.
6. The harmonic cancellation system of claim 1 or 2, wherein the first transformer, the second transformer and the third transformer are all K4 transformers, and the fourth transformer, the fifth transformer and the sixth transformer are all K20 transformers.
7. The harmonic cancellation system of a phasor transformer junction line of claim 1 or 2, wherein the first, second and third transformers are K4 three-phase amorphous isolated transformers of Dy1, dz0, dz2, respectively, and the fourth, fifth and sixth transformers of the second transformer group are K20 three-phase amorphous isolated transformers of Dy1, dz0, dz2, respectively.
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| CN201810920653.XA CN110829430B (en) | 2018-08-14 | 2018-08-14 | Harmonic elimination system of phasor transformer junction line |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101036276A (en) * | 2004-08-26 | 2007-09-12 | 康弗蒂姆有限公司 | Transformers |
| CN102237686A (en) * | 2010-04-20 | 2011-11-09 | 通用电气公司 | Method and apparatus for reduction of harmonics in a power supply |
| CN105609275A (en) * | 2016-01-13 | 2016-05-25 | 苏州吴变电气科技有限公司 | 54 pulse wave phase shift rectifier transformer |
| CN206313674U (en) * | 2016-12-28 | 2017-07-07 | 嘉兴伏尔电子科技有限公司 | A kind of multiple busbar power supply |
| CN106953332A (en) * | 2017-05-02 | 2017-07-14 | 中国矿业大学 | Electrified railway in-phase power supply scheme based on uncontrollable rectifier and step doping inversion |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8279640B2 (en) * | 2008-09-24 | 2012-10-02 | Teco-Westinghouse Motor Company | Modular multi-pulse transformer rectifier for use in symmetric multi-level power converter |
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2018
- 2018-08-14 CN CN201810920653.XA patent/CN110829430B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101036276A (en) * | 2004-08-26 | 2007-09-12 | 康弗蒂姆有限公司 | Transformers |
| CN102237686A (en) * | 2010-04-20 | 2011-11-09 | 通用电气公司 | Method and apparatus for reduction of harmonics in a power supply |
| CN105609275A (en) * | 2016-01-13 | 2016-05-25 | 苏州吴变电气科技有限公司 | 54 pulse wave phase shift rectifier transformer |
| CN206313674U (en) * | 2016-12-28 | 2017-07-07 | 嘉兴伏尔电子科技有限公司 | A kind of multiple busbar power supply |
| CN106953332A (en) * | 2017-05-02 | 2017-07-14 | 中国矿业大学 | Electrified railway in-phase power supply scheme based on uncontrollable rectifier and step doping inversion |
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