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CN112820524A - Multi-phase transformer and rectifier system - Google Patents

Multi-phase transformer and rectifier system Download PDF

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Publication number
CN112820524A
CN112820524A CN202110153893.3A CN202110153893A CN112820524A CN 112820524 A CN112820524 A CN 112820524A CN 202110153893 A CN202110153893 A CN 202110153893A CN 112820524 A CN112820524 A CN 112820524A
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winding
core
phase
voltage
iron core
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CN112820524B (en
Inventor
张胜发
李锡光
徐海波
李绍辉
孔铭
乔良
李坚庆
阳志超
张诗娟
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Dongguan South Semiconductor Technology Co ltd
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Dongguan South Semiconductor Technology Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
    • H01F30/12—Two-phase, three-phase or polyphase transformers
    • H01F30/14—Two-phase, three-phase or polyphase transformers for changing the number of phases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H01F27/306—Fastening or mounting coils or windings on core, casing or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F30/00—Fixed transformers not covered by group H01F19/00
    • H01F30/02—Auto-transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H02M5/14—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion between circuits of different phase number
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/066—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode particular circuits having a special characteristic
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • H02M7/068—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode mounted on a transformer

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Rectifiers (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

The present application relates to a multiphase transformer and rectifier system. The multiphase transformer comprises a first iron core column, a second iron core column and a third iron core column, wherein the first iron core column, the second iron core column and the third iron core column are respectively provided with a first winding, a second winding, a third winding, a fourth winding, a fifth winding and a sixth winding, and the specific winding design and structural layout are adopted, so that the transformer has three input ends and nine output ends, the three-phase input lines can be converted into three groups of three-phase voltages to jointly form nine-phase voltage output, nine-phase power frequency AC-DC rectification is realized, the power factor is improved, the total harmonic content of input current is reduced, the overall working performance of the transformer is improved, the reactive compensation and harmonic management cost is reduced, in addition, the multiphase transformer has a voltage reduction function, the voltage of the output end can be smaller than the voltage of the input end, the application requirements of direct low-voltage power frequency AC-DC rectification such as low voltage and the like can be met, low use cost and high reliability.

Description

Multi-phase transformer and rectifier system
Technical Field
The present application relates to the field of transformer technology, and more particularly, to a multi-phase transformer and a rectifier system.
Background
The transformer is a device for changing alternating voltage by utilizing the principle of electromagnetic induction, and main components comprise a coil and an iron core, and the transformer has the following main functions: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization, and the like. The multiphase self-coupling phase-shifting rectifier transformer is one of transformers, is a core component for realizing power frequency AC-DC rectification, is widely applied to medium and high power frequency converter systems, and has the advantages of strong adaptability to commercial power supply environment, strong load impact resistance, high reliability and the like.
The traditional power frequency AC-DC rectification adopts 3-phase 6-pulse wave power frequency AC-DC rectification, and a core component of the traditional power frequency AC-DC rectification adopts a three-phase transformer, but the method has low power factor, can generate larger input current harmonic wave, exceeds the limit requirements of reactive power and harmonic wave of a power grid for industrial application, has large influence on the power grid, and generates serious harmonic wave interference on other electrical equipment. In the medium and high power application, higher-cost reactive compensation and harmonic treatment equipment is required, the additional cost is high, and the reliability is low.
Disclosure of Invention
In view of the above, it is necessary to provide a multi-phase transformer and a rectifier system for solving the problems of the conventional power frequency AC-DC rectification method.
A multiphase transformer comprises a first iron core column, a second iron core column and a third iron core column, wherein a first winding, a second winding, a third winding, a fourth winding, a fifth winding and a sixth winding are arranged on the first iron core column, the second iron core column and the third iron core column;
a first end of a first winding on the first core limb is connected with a first end of a fourth winding on the second core limb, a first end of the first winding on the second core limb is connected with a first end of the fourth winding on the third core limb, and a first end of the first winding on the third core limb is connected with a first end of the fourth winding on the first core limb;
a second end of a fifth winding on the first core leg is connected to a second end of a third winding on the second core leg, a second end of the fifth winding on the second core leg is connected to a second end of the third winding on the third core leg, and a second end of the fifth winding on the third core leg is connected to a second end of the third winding on the first core leg;
a second end of a fourth winding on the first core limb and a first end of a fifth winding on the first core limb are both connected with a second end of a sixth winding on the third core limb, the second end of the fourth winding on the third core limb and the first end of the fifth winding on the third core limb are both connected with a second end of the sixth winding on the second core limb, and the second end of the fourth winding on the second core limb and the first end of the fifth winding on the second core limb are both connected with the second end of the sixth winding on the first core limb;
a second end of a second winding on the second core leg is connected to a first end of a third winding on the second core leg, a second end of the second winding on the third core leg is connected to a first end of the third winding on the third core leg, and a second end of the second winding on the first core leg is connected to a first end of the third winding on the first core leg;
a second end of the first winding on the third core column is connected with a first end of the second winding on the third core column, a second end of the first winding on the first core column is connected with a first end of the second winding on the first core column, and a second end of the first winding on the second core column is connected with a first end of the second winding on the second core column;
the input end of the multi-phase transformer comprises a first end of a sixth winding on the first iron core column, a first end of a sixth winding on the second iron core column and a first end of a sixth winding on the third iron core column, and the output end of the multi-phase transformer comprises a common connecting end of a fourth winding and a fifth winding on each iron core column, a common connecting end of a second winding and a third winding on each iron core column and a common connecting end of a first winding and a second winding on each iron core column.
A rectifier system comprising a full wave rectifier bridge and a multi-phase transformer as described above, the full wave rectifier bridge connecting the output terminals of the multi-phase transformer.
The multi-phase transformer and rectifier system adopts specific winding design and structural layout, six windings are respectively arranged on three iron core columns, and through the specific connection relationship among the windings, the transformer is provided with three input ends, nine output ends, the input three-phase line voltage can be converted into three groups of three-phase line voltage, nine-phase line voltage output is formed between specific phase voltages, nine-phase power frequency AC-DC rectification is realized, the power factor is improved, the total harmonic content of input current is reduced, the working performance of the transformer is improved, the additional reactive compensation and harmonic treatment cost is reduced, particularly, the multi-phase transformer is designed according to a voltage reduction function, the voltage of an output end is smaller than that of an input end, the application requirements of direct low-voltage power frequency AC-DC rectification of a low-voltage frequency converter and the like can be met, and the multi-phase transformer is low in use cost and high in reliability.
In one embodiment, the winding directions of the windings on the first core limb are the same, the winding directions of the windings on the second core limb are the same, and the winding directions of the windings on the third core limb are the same.
In one embodiment, the output end of the multi-phase transformer includes a main step-down three-phase voltage output end, an advance phase three-phase voltage output end and a lag phase three-phase voltage output end, the main step-down three-phase voltage output end includes a common connection end of a fourth winding and a fifth winding on the first core limb, a common connection end of the fourth winding and the fifth winding on the second core limb, and a common connection end of the fourth winding and the fifth winding on the third core limb, the advance phase three-phase voltage output end includes a common connection end of a second winding and a third winding on the first core limb, a common connection end of a second winding and a third winding on the second core limb, and a common connection end of a second winding and a third winding on the third core limb, and the lag phase voltage output end includes a common connection end of a first winding and a second winding on the first core limb, and a lag phase voltage output end, And the common connecting end of the first winding and the second winding on the second iron core column and the common connecting end of the first winding and the second winding on the third iron core column.
In one embodiment, the voltage vector output by the leading phase three-phase voltage output end is ahead of the voltage vector output by the main step-down three-phase voltage output end, and the voltage vector output by the lagging phase three-phase voltage output end is behind the voltage vector output by the main step-down three-phase voltage output end.
In one embodiment, the common connection end of the fourth winding and the fifth winding on the first core limb outputs a voltage vector of
Figure BDA0002933748100000041
The voltage vector output by the common connection end of the fourth winding and the fifth winding on the second iron core column is
Figure BDA0002933748100000042
The voltage vector output by the common connecting end of the fourth winding and the fifth winding on the third iron core column is
Figure BDA0002933748100000043
A second winding on the first core limb andthe common connection of the third winding outputs a voltage vector of
Figure BDA0002933748100000044
The voltage vector output by the common connection end of the second winding and the third winding on the second iron core column is
Figure BDA0002933748100000045
The voltage vector output by the common connecting end of the second winding and the third winding on the third iron core column is
Figure BDA0002933748100000046
The voltage vector output by the common connecting end of the first winding and the second winding on the first iron core column is
Figure BDA0002933748100000047
The voltage vector output by the common connecting end of the first winding and the second winding on the second iron core column is
Figure BDA0002933748100000048
The voltage vector output by the common connecting end of the first winding and the second winding on the third iron core column is
Figure BDA0002933748100000049
Vector of line voltage difference
Figure BDA00029337481000000410
Figure BDA00029337481000000411
And
Figure BDA00029337481000000412
are equal in magnitude.
In one embodiment, the line voltage difference vector
Figure BDA00029337481000000413
Figure BDA00029337481000000414
And its inverse vector, forming a vector distribution with 20 degrees intervals in a 360 degree range.
In one embodiment, the number of turns of the corresponding windings on the first core leg, the second core leg and the third core leg is equal.
In one embodiment, the first winding and the third winding on each core leg have the same number of turns, and the fourth winding and the fifth winding on each core leg have the same number of turns.
In one embodiment, the full-wave rectifier bridge includes nine rectifier diode bridge arms, one output end of the multiphase transformer is correspondingly connected with an alternating current input node of one rectifier diode bridge arm, a common connection end of a direct current side anode of each rectifier diode bridge arm forms a load anode connection end, and a common connection end of a direct current side cathode of each rectifier diode bridge arm forms a load cathode connection end.
Drawings
FIG. 1 is a schematic diagram of a multi-phase transformer in one embodiment;
FIG. 2 is a block diagram of a multi-phase transformer in one embodiment;
FIG. 3 is a schematic diagram of the operation of a multi-phase transformer in one embodiment;
FIG. 4 is a schematic diagram of a rectifier system in one embodiment;
FIG. 5 is a block diagram of a rectifier system in one embodiment;
fig. 6 is a schematic of input current and output voltage waveforms for a rectifier system in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described more fully below by way of examples in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, referring to fig. 1, a multi-phase transformer is provided, comprising a first core leg 21, a second core leg 22, and a third core leg 23, on each of which a first winding, a second winding, a third winding, a fourth winding, a fifth winding, and a sixth winding are arranged on the first core leg 21, the second core leg 22, and the third core leg 23. Referring to fig. 2, a first end of the first winding 311 on the first core leg 21 is connected to a first end of the fourth winding 324 on the second core leg 22, a first end of the first winding 321 on the second core leg 22 is connected to a first end of the fourth winding 334 on the third core leg 23, and a first end of the first winding 331 on the third core leg 23 is connected to a first end of the fourth winding 314 on the first core leg 21. A second end of the fifth winding 315 on the first core leg 21 is connected to a second end of the third winding 323 on the second core leg 22, a second end of the fifth winding 325 on the second core leg 22 is connected to a second end of the third winding 333 on the third core leg 23, and a second end of the fifth winding 335 on the third core leg 23 is connected to a second end of the third winding 313 on the first core leg 21.
The second end of the fourth winding 314 on the first core leg 21 and the first end of the fifth winding 315 on the first core leg 21 are both connected to the second end of the sixth winding 336 on the third core leg 23, the second end of the fourth winding 334 on the third core leg 23 and the first end of the fifth winding 335 on the third core leg 23 are both connected to the second end of the sixth winding 326 on the second core leg 22, and the second end of the fourth winding 324 on the second core leg 22 and the first end of the fifth winding 325 on the second core leg 22 are both connected to the second end of the sixth winding 316 on the first core leg 21. The second end of the second winding 322 on the second core leg 22 is connected to the first end of the third winding 323 on the second core leg 22, the second end of the second winding 332 on the third core leg 23 is connected to the first end of the third winding 333 on the third core leg 23, and the second end of the second winding 312 on the first core leg 21 is connected to the first end of the third winding 313 on the first core leg 21. The second end of the first winding 331 on the third core leg 23 is connected to the first end of the second winding 332 on the third core leg 23, the second end of the first winding 311 on the first core leg 21 is connected to the first end of the second winding 312 on the first core leg 21, and the second end of the first winding 321 on the second core leg 22 is connected to the first end of the second winding 322 on the second core leg 22.
The input terminals of the multi-phase transformer comprise a first end of a sixth winding 316 on the first core leg 21, a first end of a sixth winding 326 on the second core leg 22 and a first end of a sixth winding 336 on the third core leg 23, and the output terminals of the multi-phase transformer comprise a common connection terminal of the fourth and fifth windings on each core leg, a common connection terminal of the second and third windings on each core leg and a common connection terminal of the first and second windings on each core leg.
Specifically, the multiphase transformer in this embodiment is a core component for implementing power frequency AC-DC rectification, and may be applied to a medium-high power low-voltage inverter system. The multiphase transformer comprises a first iron core column 21, a first winding 311, a second winding 312, a third winding 313, a fourth winding 314, a fifth winding 315 and a sixth winding 316 which are arranged on the first iron core column 21, a second iron core column 22, a first winding 321, a second winding 322, a third winding 323, a fourth winding 324, a fifth winding 325 and a sixth winding 326 which are arranged on the second iron core column 22, a third iron core column 23, and a first winding 331, a second winding 332, a third winding 333, a fourth winding 334, a fifth winding 335 and a sixth winding 336 which are arranged on the third iron core column 23. Furthermore, the first winding, the second winding, the third winding, the fourth winding, the fifth winding and the sixth winding are arranged at corresponding positions on each iron core column, and the windings arranged at the corresponding positions on each iron core column adopt the same winding serial number, so that the transformer structure is convenient to identify. In addition, the multi-phase transformer comprises an upper yoke 11 and a lower yoke 12, one end of the first leg 21, the second leg 22 and the third leg 23 being connected to the upper yoke 11 and the other end being connected to the lower yoke 12. The first core limb 21, the second core limb 22, the third core limb 23, the upper yoke 11 and the lower yoke 12 may be made of silicon steel sheets of the same material to ensure that the magnetic circuit works normally.
The number of the input ends of the multi-phase transformer is three, and when the number of the output ends of the multi-phase transformer is nine, the multi-phase transformer can be connected with power frequency three-phase voltage to output power frequency nine-phase voltage, and at the moment, the multi-phase transformer is a nine-phase transformer. The multiphase transformer adopts specific winding design and structural layout, six windings are respectively arranged on three iron core columns, and specific connection relations among the windings are utilized, so that the transformer has three input ends and nine output ends, the input three-phase line voltage can be converted into three groups of three-phase line voltages, specific nine-phase line voltage output is jointly formed, nine-phase power frequency AC-DC rectification is realized, the power factor is improved, the total harmonic content of input current is reduced, the overall working performance is improved, the reactive compensation and harmonic treatment cost is reduced, particularly, the multiphase transformer is designed according to a voltage reduction function, the voltage of the output end is smaller than that of the input end, the application requirements of direct low-voltage power frequency AC-DC rectification such as a low-voltage frequency converter can be met, the use cost is low, and the reliability is high.
In one embodiment, the winding direction of each winding on the first core limb 21 is the same, the winding direction of each winding on the second core limb 22 is the same, and the winding direction of each winding on the third core limb 23 is the same.
Specifically, referring to fig. 1-2, the first ends of the windings on the core legs are respectively used as the heads of the windings, and the second ends of the windings on the core legs are respectively used as the tails of the windings. The winding direction of the winding refers to the winding direction of the winding on the corresponding core limb. The winding directions of the windings on the first core limb 21 are the same, the heads (terminals with black dot marks) of the windings are the same ends, and the tails (terminals without black dot marks) of the windings are the same ends. The winding directions of the windings on the second core limb 22 are also the same, the heads (terminals with black dot marks) of the windings are homonymous terminals, and the tails (terminals without black dot marks) of the windings are homonymous terminals. The winding directions of the windings on the third core column 23 are the same, the heads (terminals with black dot marks) of the windings are the same ends, and the tails (terminals without black dot marks) of the windings are the same ends. Further, the winding direction of each winding on the first core limb 21, the winding direction of each winding on the second core limb 22, and the winding direction of each winding on the third core limb 23 are respectively the same, for example, the winding directions of the first winding on the first core limb 21, the first winding on the second core limb 22, and the first winding on the third core limb 23 are the same
Figure BDA0002933748100000081
In one embodiment, referring to fig. 2-3, the output terminals of the multi-phase transformer include a main buck three-phase voltage output terminal, a leading phase three-phase voltage output terminal and a lagging phase three-phase voltage output terminal, the main buck three-phase voltage output terminal includes a common connection terminal 315 of a fourth winding 314 and a fifth winding on a first core limb 21, a common connection terminal 315 of a fourth winding 324 and a fifth winding 325 on a second core limb 22, and a common connection terminal 334 and a fifth winding 335 on a third core limb 23, the leading phase three-phase voltage output terminal includes a common connection terminal of a second winding 312 and a third winding 313 on the first core limb 21, a common connection terminal of a second winding 322 and a third winding 323 on the second core limb 22, and a common connection terminal of a second winding 332 and a third winding 333 on the third core limb 23, and the lagging phase voltage output terminal includes a common connection terminal 311 and a second winding 312 on the first core limb 21, The common connection of the first winding 321 and the second winding 322 on the second core leg 22 and the common connection of the first winding 331 and the second winding 332 on the third core leg 23.
Specifically, referring to fig. 2-3, the nodes (a, B, C) are power frequency three-phase voltage input terminals corresponding to vectors
Figure BDA0002933748100000091
The voltage vector of the power frequency three-phase input phase is the voltage vector of three input ends of the multi-phase transformer. Node (A)0，B0，C0) Is a power frequency three-phase main voltage reduction phase output end, namely a main voltage reduction three-phase voltage output end, corresponding to a vector
Figure BDA0002933748100000092
The phase voltage vector is a power frequency three-phase main voltage reduction phase. Node (A)1，B1，C1) Corresponding vector for power frequency three-phase leading-phase output end, i.e. leading-phase three-phase voltage output end
Figure BDA0002933748100000093
Figure BDA0002933748100000094
For power frequency three-phase superThe leading phase "phase voltage vector. Node (A)2，B2，C2) Corresponding vectors for power frequency three-phase lagging phase output ends, namely lagging phase three-phase voltage output ends
Figure BDA0002933748100000095
The power frequency three-phase lagging phase voltage vector is obtained. The input power frequency three-phase voltage (A-B-C) is respectively input from the head connection point of the sixth winding on each iron core column, the output main voltage reduction phase three-phase voltage (A0-B0-C0) is respectively output from the tail connection point of the sixth winding on each iron core column, the leading phase three-phase voltage (A1-B1-C1) is respectively output from the connection point of the second winding and the third winding on each iron core column, and the lagging phase three-phase voltage (A2-B2-C2) is respectively output from the connection point of the first winding and the second winding on each iron core column.
In one embodiment, the voltage vector output by the leading phase three-phase voltage output terminal leads the voltage vector output by the main step-down three-phase voltage output terminal, and the voltage vector output by the lagging phase three-phase voltage output terminal lags the voltage vector output by the main step-down three-phase voltage output terminal.
Specifically, the voltage vector output by the leading phase three-phase voltage output end is ahead of the voltage vector output by the main step-down three-phase voltage output end, which means that the voltage vector output by the leading phase three-phase voltage output end
Figure BDA0002933748100000096
Voltage vectors respectively ahead of the output of the main step-down three-phase voltage output terminal
Figure BDA0002933748100000097
The voltage vector output by the lagging phase three-phase voltage output end lags behind the voltage vector output by the main voltage-reducing three-phase voltage output end, namely the voltage vector output by the lagging phase three-phase voltage output end
Figure BDA0002933748100000098
Voltage vectors respectively lagging behind output ends of main voltage reduction three-phase voltage
Figure BDA0002933748100000099
The phase angle, lead and lag are 37 degrees.
In one embodiment, referring to fig. 2-3, the voltage vector output from the common connection end of the fourth winding 314 and the fifth winding 315 on the first core limb 21 is
Figure BDA0002933748100000101
The voltage vector output from the common connection end of the fourth winding 324 and the fifth winding 325 on the second core limb 22 is
Figure BDA0002933748100000102
The voltage vector output by the common connection end of the fourth winding 334 and the fifth winding 335 on the third core column 23 is
Figure BDA0002933748100000103
The voltage vector output from the common connection end of the second winding 312 and the third winding 313 on the first core limb 21 is
Figure BDA0002933748100000104
The voltage vector output from the common connection end of the second winding 322 and the third winding 323 on the second core limb 22 is
Figure BDA0002933748100000105
The voltage vector output by the common connecting end of the second winding 332 and the third winding 333 on the third core column 23 is
Figure BDA0002933748100000106
The voltage vector output from the common connection end of the first winding 311 and the second winding 312 of the first core limb 21 is
Figure BDA0002933748100000107
The voltage vector output from the common connection end of the first winding 321 and the second winding 322 on the second core limb 22 is
Figure BDA0002933748100000108
First winding on third iron core column 23The voltage vector output by the common connection of the group 331 and the second winding 332 is
Figure BDA0002933748100000109
Vector of line voltage difference
Figure BDA00029337481000001010
Figure BDA00029337481000001011
And
Figure BDA00029337481000001012
are equal in magnitude.
When the following nine line voltage difference vectors
Figure BDA00029337481000001013
Figure BDA00029337481000001014
When the output voltages of the nine rectifier diode bridge arms are equal, the output voltages of the nine rectifier diode bridge arms can be directly connected in parallel if the nine output terminals of the multi-phase transformer are respectively connected with one rectifier diode bridge arm, the anodes of all the rectifier diode bridge arms form a common connecting end for being connected with the anode of the resistive load 90, and the cathodes of all the diode bridge arms form a common connecting end for being connected with the cathode of the resistive load 90. The voltage output by the multi-phase transformer does not need to be externally connected with a balance reactor after being rectified, the direct low-voltage power frequency AC-DC rectification application requirements of a low-voltage frequency converter and the like can be met, the use cost and the occupied volume of equipment are reduced, and the use convenience is improved.
In one embodiment, the line voltage difference vector
Figure BDA00029337481000001015
Figure BDA00029337481000001016
And its inverse vector, forming a vector distribution with 20 degrees intervals in a 360 degree range.
Current line voltage difference vector
Figure BDA0002933748100000111
Figure BDA0002933748100000112
And the inverted vectors thereof, when vector distribution at intervals of 20 degrees is formed in a range of 360 degrees, if nine output ends of the multiphase transformer are respectively connected with one rectifier diode bridge arm, the outputs of all the rectifier diode bridge arms can be connected in parallel to realize 18 pulse wave ripples. Furthermore, on the basis, a main voltage reduction phase voltage vector is set
Figure BDA0002933748100000113
Are respectively three-phase input phase voltage vectors
Figure BDA0002933748100000114
Figure BDA0002933748100000115
M times (M)<1) Let the phase voltage amplitudes of the three-phase input (A, B, C) be VPThe three-phase main step-down output (A)0，B0，C0) The phase voltage amplitudes are all M.VP(M<1). From this, the phase voltage vector of each leading phase can be obtained
Figure BDA0002933748100000116
The amplitude values of (A) are all 0.767. M.VPThe phase of the corresponding leading main vector is about 37 degrees; voltage vector of each lagging phase
Figure BDA0002933748100000117
The amplitude of (A) is also 0.767. M.VPThe corresponding lag dominant vector phase is about 37 degrees.
In one embodiment the number of turns of the corresponding windings on the first core leg 21, the second core leg 22 and the third core leg 23 is equal. Specifically, the number of turns of the corresponding windings on the first iron core column 21, the second iron core column 22 and the third iron core column 23 is equal, which means that the number of turns of the windings at the corresponding positions on the first iron core column 21, the second iron core column 22 and the third iron core column 23 is equal, for example, the number of turns of the first winding 311 on the first iron core column 21, the first winding 321 on the second iron core column 22 and the first winding 331 on the third iron core column 23 is equal, the number of turns of the second winding 312 on the first iron core column 21, the second winding 322 on the second iron core column 22 and the second winding 332 on the third iron core column 23 are equal, the number of turns of other windings with corresponding winding numbers is also equal, and details are not repeated herein.
Setting the phase voltage vector of the main buck phase
Figure BDA0002933748100000118
Are respectively three-phase input phase voltage vectors
Figure BDA0002933748100000119
M times (M)<1) Then according to the constraint relation between the magnetic flux of the transformer and the electromotive force of each winding, the difference vector
Figure BDA00029337481000001110
Respectively corresponding to the leading corresponding main step-down vector
Figure BDA00029337481000001111
The phase angle is 30 degrees. Difference vector
Figure BDA00029337481000001112
Are the voltage vectors for winding 336, winding 316, and winding 326, respectively.
Let the phase voltage amplitudes of the three-phase input (A, B, C) be VPThe three-phase main step-down output (A)0，B0，C0) The phase voltage amplitudes are all M.VP(M<1). By vector triangles
Figure BDA0002933748100000121
Vector triangle
Figure BDA0002933748100000122
Figure BDA0002933748100000123
Sum vector triangle
Figure BDA0002933748100000124
The voltage amplitudes for windings 336, 316, and 326 may all be found as: vN4＝2·VP·sin[30°-arcsin(0.5·M)]And thus winding 336, winding 316, and winding 326 have the same number of turns, all identified in fig. 3 as N4. The number of winding turns N4 can be determined by the winding voltage and the core material in actual manufacturing.
In one embodiment, the first winding and the third winding on each core leg have the same number of turns, and the fourth winding and the fifth winding on each core leg have the same number of turns. Further, on the basis that the number of turns of the corresponding windings on the first core limb 21, the second core limb 22 and the third core limb 23 is equal, the voltage amplitude of the sixth winding on each core limb can be calculated by referring to the calculation method for the voltage amplitude of the sixth winding on each core limb in the foregoing, and the voltage amplitudes of the first winding and the third winding on each core limb are both: vN1＝0.44738·M·VPTherefore, the number of turns of the first winding on the first core leg 21, the second core leg 22 and the third core leg 23 is the same as the number of turns of the third winding on the first core leg 21, the second core leg 22 and the third core leg 23, all the turns are identified as N1 in fig. 3, and the number of turns of the winding N1 can be determined by the winding voltage and the core material in actual manufacturing.
With reference to the foregoing calculation method for the voltage amplitude of the sixth winding on each core limb, the voltage amplitudes of the fourth winding and the fifth winding on each core limb are both: vN3＝0.46159·M·VP-0.5·VN1Therefore, the number of turns of the fourth winding on the first, second and third core legs 21, 22, 23 is also equal to the voltage amplitude of the fifth winding on the first, second and third core legs 21, 22, 23, i.e. the voltage amplitudes of the six windings are equal. The number of turns of the fourth winding on the first core leg 21, the second core leg 22 and the third core leg 23 is the same as the number of turns of the fifth winding on the first core leg 21, the second core leg 22 and the third core leg 23, the number of turns is N3 in fig. 3, and the number of turns N3 of the winding can be determined by winding voltage and core material in actual manufacturing.
Further, reference is made to the foregoing for the sixth winding on each core legThe voltage amplitude can be calculated by the calculation method, and the voltage amplitudes of the second windings on the iron core columns are all as follows: vN2＝0.59938·M·VPAnd therefore the number of turns of the second winding on the first leg 21, the second leg 22 and the third leg 23 is the same, all identified in fig. 3 as N2. The number of winding turns N2 can be determined by the winding voltage and the core material in actual manufacturing.
The multi-phase transformer adopts the specific winding design and the structural layout, six windings are respectively arranged on three iron core columns, and specific connection relations among the windings are utilized to enable the transformer to have three input ends and nine output ends, the three-phase line voltage input can be converted into three-phase voltage groups, nine-phase line voltage output is jointly formed, nine-phase power frequency AC-DC rectification is realized, the power factor is improved, the total harmonic content of input current is reduced, the overall working performance of the transformer is improved, the reactive compensation and harmonic treatment cost are reduced, particularly, the multi-phase transformer is designed according to a voltage reduction function, the voltage of the output end is smaller than that of the input end, the application requirements of direct low-voltage power frequency AC-DC rectification of a low-voltage frequency converter and the like can be met, the use cost is low, and the reliability is high.
In one embodiment, referring to fig. 4-5, a rectifier system is provided, which includes a full-wave rectifier bridge 50 and the multi-phase transformer 40 as described above, the full-wave rectifier bridge 50 being connected to the output of the multi-phase transformer 40. The multiphase transformer 40 may output a specific symmetrical nine-phase voltage, which may be applied to the resistive load 90 after being rectified by the full-wave rectifier bridge.
In one embodiment, referring to fig. 5, the full-wave rectifier bridge 50 includes nine rectifier diode bridge arms, an output end of the multiphase transformer 40 is correspondingly connected to an ac input node of one rectifier diode bridge arm, a common connection end of the dc-side anodes of the rectifier diode bridge arms forms an anode connection end of the resistive load 90, and a common connection end of the dc-side cathodes of the rectifier diode bridge arms forms a cathode connection end of the resistive load 90. The nine rectifier diode bridge arms adopt 18 rectifier diodes, nine-phase output of the multiphase transformer 40 is respectively connected with alternating current input nodes of the rectifier diode bridge arms, direct current side anodes of all the rectifier diode bridge arms are connected together to be connected with an anode of the resistive load 90, direct current side cathodes of all the rectifier diode bridge arms are connected together to be connected with a cathode of the resistive load 90, and the requirements of direct low-voltage power frequency AC-DC rectification application of a low-voltage frequency converter and the like can be met.
For a better understanding of the above embodiments, the following detailed description is given in conjunction with a specific embodiment. In this embodiment, the multi-phase transformer is a nine-phase step-down auto-coupling phase-shifting rectifier transformer, and includes an iron core and a winding. The core comprises an upper yoke 11, a lower yoke 12, a first core leg 21, a second core leg 22 and a third core leg 23. The winding structure 31 on the first core leg comprises a first winding 311, a second winding 312, a third winding 313, a fourth winding 314, a fifth winding 315, a sixth winding 316. The winding structure 32 on the second core leg comprises a first winding 321, a second winding 322, a third winding 323, a fourth winding 324, a fifth winding 325, a sixth winding 326. The winding structure 33 on the third core leg comprises a first winding 331, a second winding 332, a third winding 333, a fourth winding 334, a fifth winding 335, a sixth winding 336.
Referring to fig. 1, the winding directions of the windings on the first core limb 21 are the same, the heads (terminals with black dot marks) of the windings are the same terminals, and the tails (terminals without black dot marks) of the windings are the same terminals. In fig. 1, the winding directions of the windings on the second core limb 22 are the same, the heads (terminals with black dot marks) of the windings are the same terminals, and the tails (terminals without black dot marks) of the windings are the same terminals. In fig. 1, the winding directions of the windings on the third core limb 23 are the same, the heads (terminals with black dot marks) of the windings are homonymous terminals, and the tails (terminals without black dot marks) of the windings are homonymous terminals. The configuration of each winding on the first core limb 21, the configuration of each winding on the second core limb 22, the configuration of each winding on the third core limb 23, and the like are correspondingly the same.
Fig. 2 is a schematic diagram of the connection relationship between the windings of the multiphase transformer of this embodiment. The head of winding 311 is connected to the head of winding 324, the head of winding 321 is connected to the head of winding 334, and the head of winding 331 is connected to the head of winding 314. The tail of winding 315 is connected to the tail of winding 323, the tail of winding 325 is connected to the tail of winding 333, and the tail of winding 335 is connected to the tail of winding 313. The tail of winding 336 connects the tail of winding 314 to the head of winding 315 as the a0 phase output node for one of the nine phase voltage outputs, while the head of winding 336 serves as the a phase input node for one of the three phase voltage inputs. The tail of winding 326 connects the tail of winding 334 to the head of winding 335 as the C0 phase output node for one of the nine phase voltage outputs, while the head of winding 326 serves as the C phase input node for one of the three phase voltage inputs. The tail of winding 316 connects the tail of winding 324 to the head of winding 325, which serves as the B0 phase output node for one of the nine phase voltage outputs, while the head of winding 316 serves as the B phase input node for one of the three phase voltage inputs. The tail of winding 322 is connected to the head of winding 323, which is the a1 phase output node for one of the nine phase voltage outputs. The tail of winding 332 is connected to the head of winding 333 as the B1 phase output node for one of the nine phase voltage outputs. The tail of winding 312 is connected to the head of winding 313, which is the C1 phase output node for one of the nine phase voltage outputs. The tail of winding 331 is connected to the head of winding 332, which is the a2 phase output node for one of the nine phase voltage outputs. The tail of winding 311 is connected to the head of winding 312, which is the B2 phase output node for one of the nine phase voltage outputs. The tail of winding 321 is connected to the head of winding 322, which is the C2 phase output node for one of the nine phase voltage outputs.
Fig. 3 is a schematic diagram of a circuit of a multi-phase transformer and a vector diagram of phase voltages in an embodiment, and a corresponding relationship diagram of the two diagrams. The nodes (A, B and C) are power frequency three-phase voltage input ends and correspond to vectors
Figure BDA0002933748100000151
Figure BDA0002933748100000152
And the power frequency three-phase input phase voltage vector is obtained. Node (A)0，B0，C0) Is a power frequency three-phase main voltage-reducing phase output end and corresponds to a vector
Figure BDA0002933748100000153
Is a power frequency three-phase "The main buck phase "phase voltage vector. Node (A)1，B1，C1) Corresponding vector for power frequency three-phase leading phase output end
Figure BDA0002933748100000154
For power frequency three-phase leading phase voltage vector
Figure BDA0002933748100000155
Respectively preceding the corresponding principal vectors
Figure BDA0002933748100000156
The phase angle is 37 degrees. Node (A)2，B2，C2) Corresponding vector for power frequency three-phase lag phase output end
Figure BDA0002933748100000157
For power frequency three-phase lagging phase voltage vector
Figure BDA0002933748100000158
Respectively lags corresponding principal vectors
Figure BDA0002933748100000159
Figure BDA00029337481000001510
The phase angle is 37 degrees.
Setting the phase voltage vector of the main buck phase
Figure BDA00029337481000001511
Are respectively three-phase input phase voltage vectors
Figure BDA00029337481000001512
M times (M)<1) Then according to the constraint relation between the magnetic flux of the transformer and the electromotive force of each winding, the difference vector
Figure BDA00029337481000001513
Respectively corresponding to the leading corresponding main step-down vector
Figure BDA00029337481000001514
The phase angle is 30 degrees. Difference vector
Figure BDA00029337481000001515
Are the voltage vectors for winding 336, winding 316, and winding 326, respectively.
Let the phase voltage amplitudes of the three-phase input (A, B, C) be VPThe amplitude of the phase voltage of the three-phase main step-down output (A0, B0, C0) is M.VP(M<1). By vector triangles
Figure BDA0002933748100000161
Vector triangle
Figure BDA0002933748100000162
Figure BDA0002933748100000163
Sum vector triangle
Figure BDA0002933748100000164
The voltage amplitudes for windings 336, 316, and 326 may all be found as: vN4＝2·VP·sin[30°-arcsin(0.5·M)]And thus winding 336, winding 316, and winding 326 have the same number of turns, all identified as N4. The number of winding turns N4 can be determined by the winding voltage and the core material in actual manufacturing.
Fig. 4 is a schematic circuit diagram of a rectifier system in one embodiment of the present application, including the multiphase transformer 40 and 9 full-wave rectifier bridges (61,62, 63; 71,72, 73; 81,82,83) corresponding to nine-phase rectification, and a resistive load 90. Each full-wave rectifier bridge is composed of two rectifier bridge arms consisting of 4 rectifier diodes respectively and is used for connecting a nine-phase step-down autotransformer and a direct-current load, direct-current outputs of all full-wave rectifier bridges are directly connected in parallel and then connected with a resistance load 90, the resistance load 90 is generally a direct-current load, an external balance reactor is not needed, system design is simplified, reliability is enhanced, and cost is reduced.
To achieve direct parallel connection of the outputs of the full-wave rectifier bridges of fig. 4, the following nine linesVector of voltage differences
Figure BDA0002933748100000165
Figure BDA0002933748100000166
Equal amplitude is the amplitude after voltage reduction
Figure BDA0002933748100000167
In order to realize symmetrical 18-pulse wave ripple after the outputs of the full-wave rectifier bridges in fig. 4 are connected in parallel, the following nine line voltage difference vectors
Figure BDA0002933748100000168
Figure BDA0002933748100000169
Etc. together with their inverse vectors (total of 18 line voltage vectors) form a vector distribution spaced 20 degrees apart over a 360 degree range. From this, the phase voltage vector of each leading phase can be obtained
Figure BDA00029337481000001610
The amplitude values of (A) are all 0.767. M.VPThe phase of the corresponding leading main vector is about 37 degrees; voltage vector of each lagging phase
Figure BDA00029337481000001611
Figure BDA00029337481000001612
The amplitude of (A) is also 0.767. M.VPThe corresponding lag dominant vector phase is about 37 degrees.
Refer to the vector relationships in fig. 3. And taking into account: the voltage vector direction of each winding on the first core limb 21 is the same, for example, the same as the voltage vector direction on the winding 316; the voltage vector direction of each winding on the core leg of the second iron 22 is the same, for example, the same as the voltage vector direction on the winding 326; the voltage vector direction of each winding on the third leg 23 is the same, for example, as the voltage vector direction on winding 336. Thus, the voltage amplitude and the number of turns of each winding can be obtained through the calculation of the amplitude and the phase of each vector polygon.
The voltage amplitudes of winding 311, winding 313, winding 321, winding 323, winding 331, and winding 333 are: vN1＝0.44738·M·VPAnd therefore the number of turns for winding 311, winding 313, winding 321, winding 323, winding 331, and winding 333 are the same, all identified in fig. 3 as N1. The number of winding turns N1 can be determined by the winding voltage and the core material in actual manufacturing.
The voltage amplitudes of winding 314, winding 315, winding 324, winding 325, winding 334, and winding 335 are: vN3＝0.46159·M·VP-0.5·VN1And thus winding 314, winding 315, winding 324, winding 325, winding 334, and winding 335 have the same number of turns, all identified in fig. 3 as N3. The number of winding turns N3 can be determined by the winding voltage and the core material in actual manufacturing.
The voltage amplitudes of winding 312, winding 322, and winding 332 are: vN2＝0.59938·M·VPAnd thus the number of turns in winding 312, winding 322, and winding 332 are the same, all identified in fig. 3 as N2. The number of winding turns N2 can be determined by the winding voltage and the core material in actual manufacturing.
Fig. 4 illustrates the principle application of the multiphase transformer outputting specific symmetrical 9-phase line voltages, and in principle, after the 9-phase line voltages are respectively subjected to full-wave rectification, the output direct current sides of the 9-phase line voltages are directly connected in parallel to form 18-pulse rectification output, fig. 5 is a practical application circuit schematic diagram of a rectifier system in an embodiment, only a minimum of 18 rectifier diodes are used to form nine rectifier diode bridge arms 50, the nine phase outputs of the multiphase transformer 40 are respectively connected with the alternating current input nodes of the rectifier diode bridge arms, the direct current side anodes of all the rectifier diode bridge arms are connected together to the anode of the resistive load 90, and the direct current side cathodes of all the rectifier diode bridge arms are connected together to the cathode of the resistive load 90. The application system of fig. 5 meets the application requirements of direct low-voltage power frequency AC-DC rectification of a low-voltage frequency converter and the like.
Fig. 6 is a schematic diagram of an input 18-step current waveform and an output 18-pulse rectified voltage waveform of the rectifier system in one embodiment, and input current harmonics meet the requirement that the total harmonic content THD of the input current of the conventional 9-phase 18-pulse power frequency AC-DC rectification is 10.1% of the theoretical value. And the ripple of the low-voltage direct current 18-pulse voltage waveform directly output by rectification can be controlled to be about 5%, so that the burden of a subsequent filter circuit is reduced.
The rectifier system adopts the specific winding design and the structural layout, six windings are respectively arranged on three iron core columns, and specific connection relations among the windings are utilized, so that the transformer has three input ends and nine output ends, the input three-phase line voltage can be converted into three groups of three-phase line voltages, specific nine-phase line voltage output is jointly formed, nine-phase power frequency AC-DC rectification is realized, the power factor is improved, the total harmonic content of input current is reduced, the overall working performance of the transformer is improved, the reactive compensation and harmonic treatment cost are reduced, moreover, the multiphase transformer has a voltage reduction function, the voltage of the output end is smaller than that of the input end, the application requirements of direct low-voltage power frequency AC-DC rectification of a low-voltage frequency converter and the like can be met, the cost of a rectification system is reduced, and the reliability is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A multi-phase transformer is characterized by comprising a first iron core column, a second iron core column and a third iron core column, wherein a first winding, a second winding, a third winding, a fourth winding, a fifth winding and a sixth winding are arranged on the first iron core column, the second iron core column and the third iron core column;
a first end of a first winding on the first core limb is connected with a first end of a fourth winding on the second core limb, a first end of the first winding on the second core limb is connected with a first end of the fourth winding on the third core limb, and a first end of the first winding on the third core limb is connected with a first end of the fourth winding on the first core limb;
a second end of a fifth winding on the first core leg is connected to a second end of a third winding on the second core leg, a second end of the fifth winding on the second core leg is connected to a second end of the third winding on the third core leg, and a second end of the fifth winding on the third core leg is connected to a second end of the third winding on the first core leg;
a second end of a fourth winding on the first core limb and a first end of a fifth winding on the first core limb are both connected with a second end of a sixth winding on the third core limb, the second end of the fourth winding on the third core limb and the first end of the fifth winding on the third core limb are both connected with a second end of the sixth winding on the second core limb, and the second end of the fourth winding on the second core limb and the first end of the fifth winding on the second core limb are both connected with the second end of the sixth winding on the first core limb;
a second end of a second winding on the second core leg is connected to a first end of a third winding on the second core leg, a second end of the second winding on the third core leg is connected to a first end of the third winding on the third core leg, and a second end of the second winding on the first core leg is connected to a first end of the third winding on the first core leg;
a second end of the first winding on the third core column is connected with a first end of the second winding on the third core column, a second end of the first winding on the first core column is connected with a first end of the second winding on the first core column, and a second end of the first winding on the second core column is connected with a first end of the second winding on the second core column;
the input end of the multi-phase transformer comprises a first end of a sixth winding on the first iron core column, a first end of a sixth winding on the second iron core column and a first end of a sixth winding on the third iron core column, and the output end of the multi-phase transformer comprises a common connecting end of a fourth winding and a fifth winding on each iron core column, a common connecting end of a second winding and a third winding on each iron core column and a common connecting end of a first winding and a second winding on each iron core column.
2. The multiphase transformer of claim 1, wherein the winding directions of the windings on the first core leg are the same, the winding directions of the windings on the second core leg are the same, and the winding directions of the windings on the third core leg are the same.
3. The multiphase transformer of claim 1, wherein the output terminals of the multiphase transformer comprise a main buck three-phase voltage output terminal, a leading phase three-phase voltage output terminal and a lagging phase three-phase voltage output terminal, the main buck three-phase voltage output terminal comprises a common connection terminal of a fourth winding and a fifth winding on the first core limb, a common connection terminal of the fourth winding and the fifth winding on the second core limb and a common connection terminal of the fourth winding and the fifth winding on the third core limb, the leading phase three-phase voltage output terminal comprises a common connection terminal of a second winding and a third winding on the first core limb, a common connection terminal of a second winding and a third winding on the second core limb and a common connection terminal of a second winding and a third winding on the third core limb, and the lagging phase voltage output terminal comprises a common connection terminal of a first winding and a second winding on the first core limb, a leading phase three-phase voltage output terminal, a lagging phase three-phase voltage output terminal comprises a common connection terminal of a first winding, And the common connecting end of the first winding and the second winding on the second iron core column and the common connecting end of the first winding and the second winding on the third iron core column.
4. The multiphase transformer of claim 3, wherein said leading phase three phase voltage output outputs a voltage vector that leads said primary buck three phase voltage output, and wherein said lagging phase three phase voltage output outputs a voltage vector that lags said primary buck three phase voltage output.
5. The multiphase transformer of claim 1, wherein the common connection end of the fourth winding and the fifth winding on the first core leg outputs a voltage vector of
Figure FDA0002933748090000031
The voltage vector output by the common connection end of the fourth winding and the fifth winding on the second iron core column is
Figure FDA0002933748090000032
The voltage vector output by the common connecting end of the fourth winding and the fifth winding on the third iron core column is
Figure FDA0002933748090000033
The voltage vector output by the common connection end of the second winding and the third winding on the first iron core column is
Figure FDA0002933748090000034
The voltage vector output by the common connection end of the second winding and the third winding on the second iron core column is
Figure FDA0002933748090000035
The voltage vector output by the common connecting end of the second winding and the third winding on the third iron core column is
Figure FDA0002933748090000036
The voltage vector output by the common connecting end of the first winding and the second winding on the first iron core column is
Figure FDA0002933748090000037
Of first and second windings on the second core limbThe voltage vector output by the common connection terminal is
Figure FDA0002933748090000038
The voltage vector output by the common connecting end of the first winding and the second winding on the third iron core column is
Figure FDA0002933748090000039
Vector of line voltage difference
Figure FDA00029337480900000310
Figure FDA00029337480900000311
And
Figure FDA00029337480900000312
are equal in magnitude.
6. The multiphase transformer of claim 5, wherein said line voltage difference vector
Figure FDA00029337480900000313
And its inverse vector, forming a vector distribution with 20 degrees intervals in a 360 degree range.
7. The multiphase transformer of claim 1, wherein corresponding windings on said first core leg, said second core leg, and said third core leg have an equal number of turns.
8. The multiphase transformer of claim 7, wherein the first winding and the third winding on each leg have the same number of turns, and the fourth winding and the fifth winding on each leg have the same number of turns.
9. A rectifier system comprising a full wave rectifier bridge and a multiphase transformer according to any of claims 1-8, the full wave rectifier bridge connecting the output terminals of the multiphase transformer.
10. The rectifier system according to claim 9, wherein the full-wave rectifier bridge comprises nine rectifier diode bridge arms, one output end of the multiphase transformer is correspondingly connected with an alternating current input node of one rectifier diode bridge arm, a common connection end of a direct current side anode of each rectifier diode bridge arm forms a load anode connection end, and a common connection end of a direct current side cathode of each rectifier diode bridge arm forms a load cathode connection end.
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CN112820523A (en) * 2021-02-04 2021-05-18 东莞南方半导体科技有限公司 Multiphase autotransformer and rectifier system
CN114005655A (en) * 2021-10-28 2022-02-01 西安热工研究院有限公司 Phase-shifting transformer

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