CN109545528B - Three-phase-change nine-phase step-up and step-down autotransformer - Google Patents
Three-phase-change nine-phase step-up and step-down autotransformer Download PDFInfo
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- CN109545528B CN109545528B CN201811565341.8A CN201811565341A CN109545528B CN 109545528 B CN109545528 B CN 109545528B CN 201811565341 A CN201811565341 A CN 201811565341A CN 109545528 B CN109545528 B CN 109545528B
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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
- H01F30/02—Auto-transformers
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- 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
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- 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
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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
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Abstract
The invention provides a design scheme of a three-phase-to-nine-phase step-up and step-down autotransformer, wherein a secondary side winding is sequentially displaced by 20 degrees in electrical angle. Secondary sideThe windings are symmetrical with the 20 windings about their 20 winding axes, soVoltage vectorThe voltage vector is symmetrical about the voltage vector. The scheme has three groups of windings on the secondary side，0，) Fewer turns of the additional winding, better symmetry and more approximate to sine wave of the composite magnetic potential. The weakening effect of the current low-order harmonic wave on the primary winding side is good. Because the phase-shifting transformer with the self-coupling structure is adopted, the design capacity of the phase-shifting transformer with the isolation structure is only about 10 percent, and the manufacturing cost can be greatly reduced.
Description
Technical Field
The invention relates to an AC-DC power converter, in particular to a three-phase-to-nine-phase step-up and step-down autotransformer in the AC-DC power converter.
Background
Along with the improvement of the rectifying power level, the multi-pulse rectifying circuit is widely applied to the fields of power electronics, motor driving, aircraft converter systems, high-voltage direct current transmission and the like. Although the high-frequency PWM rectification can enable the input current to approach a sine wave, the high-frequency PWM rectification has high cost, large switching loss and low efficiency, and limits the application of the PWM rectification in high-power occasions. The multi-pulse rectification technology represented by the phase-shifting transformer and the uncontrolled rectification technology can effectively reduce the harmonic current of the input side, has the advantages of high efficiency, strong overload capacity and the like, and is widely studied.
The primary side of the phase-shifting transformer of the isolation structure is provided with one winding, the secondary side is provided with three windings, and when the line voltages of the windings are equal, the phase shift is carried out between the windings of the secondary side by 20 degrees, namely the voltage phasors of the secondary side second winding and the primary winding are in phase, and the voltage phasors of the secondary side first winding lead the voltage phasors of the second winding by 20 degrees, and the voltage phasors of the secondary side third winding lag the voltage phasors of the second winding by 20 degrees. The output rectifying circuits of the three windings can be connected in series (or in parallel) and then connected with a direct current load. The adoption of the triple connection not only can reduce the harmonic wave of alternating current input current, but also can reduce the ripple amplitude of direct current output voltage (or current). The conventional multi-pulse rectification technology is based on the isolated phase-shifting transformer, and the aim of multi-pulse is achieved by multiplexing the secondary side, and particularly, the 18-pulse rectification circuit is applied to industrial production 9 But its equivalent capacity is 1.03 times the output power, which results in a rectifying circuitThe volume is too large, which is unfavorable for the miniaturization and the weight reduction of the equipment. For some autotransformers with auto-coupling structures, which have similar rated voltage values of primary and secondary windings, the design capacity of the autotransformer is only about 10% of that of the phase-shifting transformer with the isolation structure, so that the manufacturing cost can be greatly reduced.
Regarding the design scheme of the three-phase-nine-phase-change step-up and step-down autotransformer, the requirement of the triple connection winding of the isolation structure should be met as much as possible: the line voltages of the three secondary windings are equal, and the phase difference is sequentially 20 DEG in design; secondary side-20 ° winding and 20 ° winding with respect theretoThe winding axis is symmetrical, so that the current low harmonic wave at the primary winding side is greatly weakened, and the effect of isolation phase shift and triple connection can be achieved. For example, as shown in fig. 1, although three secondary windings are sequentially different in design by 20 ° in electrical angle, each core leg has six coils, the phase portions of the secondary side first autotransformer a (B, C) and the third autotransformer a (B, C) are not strictly symmetrical about the axis of the secondary winding a (B, C) in practical application, resulting in poor attenuation effect of the low harmonic wave of the current on the primary winding side in practical application.
Disclosure of Invention
The invention firstly provides a design scheme of a three-phase-to-nine-phase step-down autotransformer, which comprises three iron core columns (A 1 、B 1 、C 1 ) The method is characterized in that:
7 coils are respectively arranged on the iron core columns corresponding to each iron core column; in which =there is a on core limb A1 1 a 3 、*a 3 a' 2 、*a' 2 b' 1 、*b' 1 b 3 、*B 1 B、*c 2 c' 2 、*c' 1 c 1 7 coils, iron core column B 1 Above there is B 1 b 3 、*b 3 b' 2 、*b' 2 c' 1 、*c' 1 c 3 、*C 1 C、*a 2 a' 2 、*a' 1 a 1 7 coils, iron core column C 1 Above is C 1 c 3 、*c 3 c' 2 、*c' 2 a' 1 、*a' 1 a 3 、*A 1 A、*b 2 b' 2 、*b' 1 b 1 7 coils (the same name ends of the coils) are connected with the same terminal jumper wire on different iron cores, three high-voltage terminals A, B, C are connected with an external network, and nine terminals a 1 ，b 1 ，c 1 、a 2 ，b 2 ，c 2 、a 3 ，b 3 ，c 3 Forming a secondary low-voltage side outlet terminal;
turns of coil A 1 b 3 +B 1 B=B 1 c 3 +C 1 C=C 1 a 3 +A 1 A is an integer, the number of turns a 1 a' 1 = a 2 a' 2 = b 1 b' 1 = b 2 b' 2 = c 1 c' 1 = c 2 c' 2 And is an integer, the number of turns a 3 a' 1 = a 3 a' 2 = b 3 b' 1 = b 3 b' 2 = c 3 c' 1 = c 3 c' 2 Turns of coil A 1 a 3 = B 1 b 3 = C 1 c 3 Turns of coil A 1 A = B 1 B= C 1 C。
The invention also provides a three-phase nine-phase boost autotransformer, which comprises three iron core columns (A 1 、B 1 、C 1 ) The method is characterized in that:
7 coils are respectively arranged on the iron core columns corresponding to each iron core column; wherein, iron core column A 1 Above are a 1 A、*A B、*B 1 b 3 、*c' 2 C、*C c' 1 、*a 1 a' 1 、*b' 2 b 2 7 coils, iron core column B 1 Above there is B 1 B、*B C、*C 1 c 3 、*a' 2 A、*A a' 1 、*b 1 b' 1 、*c' 2 c 2 7 coils ， Iron core column C 1 Above is C 1 C、*C A、*A 1 a 3 、*b' 2 B、*B b' 1 、*c 1 c' 1 、*a' 2 a 2 7 coils (same name end of coil); the same terminal jumper wire on different iron cores is connected, three low-voltage terminals A, B, C are connected with an external network, nine terminals a 1 ，b 1 ，c 1 、a 2 ，b 2 ，c 2 、a 3 ，b 3 ，c 3 Forming a secondary high-voltage side outlet terminal;
turns of coil A 1 B+B 1 b 3 =B 1 C+C 1 c 3 =C 1 A+A 1 a 3 And is an integer, the number of turns c' 1 C=Cc' 2 = a' 1 A=Aa' 2 =b' 1 B=Bb' 2 And is an integer, the number of turns A 1 A=B 1 B= C 1 C, number of turns A of coil 1 a 3 = B 1 b 3 =C 1 c 3 Number of turns a of coil 1 a' 1 = a 2 a' 2 = b 1 b' 1 = b 2 b' 2 = c 1 c' 1 = c 2 c' 2 。
According to the technical scheme and the vector diagram drawn by the technical scheme, the secondary side winding is sequentially displaced by 20 degrees in design. I.e. the secondary side 20 deg. winding is symmetrical with the 20 deg. winding about its 0 deg. winding axis, so the 20 deg. voltage vector is symmetrical with the 20 deg. voltage vector about its 0 deg. winding voltage vector. The scheme has the advantages that the number of turns of the additional winding of the secondary side three groups of windings (20 degrees, 0 degree and 20 degrees) is fewer, the symmetry is better, the composite magnetic potential is closer to a sine wave, and the weakening effect of the current low-order harmonic wave on the primary winding side is good.
Because the invention has the characteristics and the advantages, the invention can be used in three-phase-change nine-phase buck or boost autotransformer products.
Drawings
FIG. 1 is a voltage phasor schematic diagram of a three-phase to nine-phase autotransformer disclosed in the prior art U.S. patent;
FIG. 2 is a schematic diagram of the voltage phasors of the three-phase nine-phase step-down autotransformer of the present invention;
FIG. 3 is a schematic diagram of the coil coupling of a three-phase to nine-phase step down autotransformer of the present invention;
FIG. 4 is a schematic diagram of the voltage phasors of the three-phase to nine-phase step-up autotransformer of the present invention;
FIG. 5 is a schematic diagram of the coil coupling of a three-phase to nine-phase step-up autotransformer of the present invention;
fig. 6 is a circuit schematic of an AC/DC power conversion system of the present invention.
Detailed Description
The structure, voltage phase vector diagram and the like of the three-phase-to-nine-phase buck or boost autotransformer product applying the technical scheme of the invention are specifically described below with reference to the accompanying drawings.
First, a three-phase nine-phase step-down autotransformer: the voltage phasor diagram is shown in fig. 2, with the thick solid lines in fig. 2 representing the turns distribution and coupling and the thin solid lines in fig. 2 representing the voltage phasors.
0ARepresenting the a-phase voltage of the primary winding,Oa 1 、 Oa 2 、Oa 3 representing three windings on the secondary sidea 1 Phase(s),a 2 Phase(s),a 3 Phase voltage.OAAndOa 3 in the same phase, the two components are in the same phase,Oa 1 advancingOa 3 20°，Oa 2 Hysteresis ofOa 3 20°，Oa 1 And (3) withOa 2 Corresponding coil arrangement0AIs completely symmetrical and is provided with a plurality of grooves,0a 3 and (3) with0AThe other phases are coincident and arranged in the same way.
As shown in fig. 2, the phasor diagram mapping step: as low-voltage side-phase voltage phasorsOa 3、 Ob 3、 Oc 3 Thena 3 、b 3 、c 3 Is a triangle with low voltage line voltageOa 1 AdvancingOa 3 20 degrees, doOa 2 Hysteresis ofOa 3 20 DEG, and voltage phasorOa 1 =Oa 2 =Oa 3 。 Coil as coil//b 3 c 3 And-> 。 Prolonged voltage phasorOa 3 To A, OA is the phase voltage at the input side, asAA 1 //c 3 a 3 And is connected witha 3 c 3 Is intersected with the extension line of (2)A 1 The method comprises the steps of carrying out a first treatment on the surface of the The coil diagram and the voltage phasor diagram of the B phase and the C phase can be respectively made in the same way.
In fig. 2, the number of turns A 1 b 3 +B 1 B= B 1 c 3 +C 1 C=C 1 a 3 +A 1 A is an integer, the number of turns a 1 a' 1 =a 2 a' 2 = b 1 b' 1 = b 2 b' 2 = c 1 c' 1 = c 2 c' 2 And is an integer.
Turns of coil a 3 a' 1 =a 3 a' 2 =b 3 b' 1 =b 3 b' 2 =c 3 c' 1 =c 3 c' 2 Turns of coil A 1 a 3 =B 1 b 3 =C 1 c 3 =A 1 A=B 1 B=C 1 And C, the number of turns of the coils can be an integer or a fraction, and the number of turns of the coils can be specifically adjusted according to the wire outlet positions of the tail ends of the winding.
As shown in fig. 2, the analysis is performed with respect to one phase voltage effective value:
A 1 A= (0A﹣0 a 3 )/√3
a' 1 a 3 =2/3（0 a 3 ﹣0 a 1 cos( β )）
a' 1 a 1 =0 a 1 sin( β )﹣a' 1 a 3 /2
a' 1 c' 2 =√30 a 1 ﹣2 a' 1 a 3
wherein beta is 0a 3 Respectively with 0a 1 、0 a 2 The included angle is also a phase-shifting angle, and the designed value is 20 degrees. 0a 1 Relative to 0a 3 Advanced beta, 0a 2 Relative to 0a 3 Hysteresis beta, 0a 3 In phase with 0A. The effective value of the primary side phase voltage 0A and the effective value of the secondary side phase voltage 0A can be deduced from the above formula 1 And the phase shift angle beta is related to the effective value of each branch voltage.
From the vector diagram relationship shown in FIG. 2, it can be seen that the voltage vector magnitude (effective value) a' 1 a 1 = a' 2 a 2 =b' 1 b 1 = b' 2 b 1 = c' 2 c 2 = c' 1 c 1 ;A 1 A= A 1 a 3 = B 1 B= B 1 b 3 =C 1 C= C 1 c 3 ;a' 1 a 3 = a' 2 a 3 = b' 1 b 3 = b' 2 b 3 = c' 2 c 3 = c' 1 c 3 ;a' 1 c' 2 = c' 1 b' 2 =b' 1 a' 2 。
Fig. 3 shows a core limb a 1 ，B 1 ，C 1 Three-phase core type iron core columns are formed, and 7 coils are arranged on each iron core column. Wherein, the iron core columnA 1 There are 7 coils: a is that 1 a 3 ，a 3 a' 2 ，a' 2 b' 1 ，b' 1 b 3 ，B 1 B，c 2 c' 2 ，c' 1 c 1 The method comprises the steps of carrying out a first treatment on the surface of the Iron core column B 1 There are 7 coils: b (B) 1 b 3 ，b 3 b' 2 ，b' 2 c' 1 ，c' 1 c 3 ，C 1 C ，a 2 a' 2 ，a' 1 a 1 The method comprises the steps of carrying out a first treatment on the surface of the Iron core column C 1 There are 7 coils: c (C) 1 c 3 ，c 3 c' 2 ，c' 2 a' 1 ，a' 1 a 3 ，A 1 A，b 2 b' 2 ，b' 1 b 1 . For this purpose, core limb A 1 ，B 1 ，C 1 The upper 21 coils are all of the same name ends of the coils are marked by 'x' in fig. 3, and the coils are tightly adhered to when connected.
As shown in fig. 3, the same terminal jumper wire on different cores is connected with:
at the iron core columnA 1 Terminal c 'on' 2 And core leg C 1 Terminal c 'on' 2 Coupling;
at the iron core columnA 1 Terminal c 'on' 1 And core leg B 1 Terminal c 'on' 1 Coupling;
at the iron core columnA 1 Terminal B on 1 And core leg B 1 Terminal B on 1 Coupling;
at the iron core column B 1 Terminal a 'on' 2 And iron core columnA 1 Terminal a 'on' 2 Coupling;
at the iron core column B 1 Terminal a 'on' 1 And core leg C 1 Terminal a 'on' 1 Coupling;
at the iron core column B 1 Terminal C on 1 And core leg C 1 Terminal C on 1 Coupling;
at the core limb C 1 Terminal b 'on' 2 And core leg B 1 Terminal b 'on' 2 Coupling;
at the core limb C 1 Terminal b 'on' 1 And iron core columnA 1 Terminal b 'on' 1 Coupling;
at the core limb C 1 Upper terminalA 1 And iron core columnA 1 Upper terminalA 1 And (5) connection.
Wherein, the iron core columnA 1 With main coilsa 3 b 3 Iron core column B 1 With main coilsb 3 c 3 Core limb C 1 With main coilsc 3 a 3 This is3 coils form a main triangle coil group of the transformer, and three-phase terminals at the high voltage side are marked as A, B and C and are connected with an external network; the nine-phase terminal of the secondary low-voltage side is marked as a 1 ，b 1 ，c 1 ；a 2 ，b 2 ，c 2 ；a 3 ，b 3 ，c 3 The output ends are respectively connected with the rectifier bridge. The coil linkage diagram of fig. 3 is identical to the phasor diagram of fig. 2, and the vector diagram of fig. 2 can be drawn according to the winding structure described above.
Therefore, after the effective value of the primary side input voltage and the effective value of the secondary side output voltage are designed or obtained, the proportion among the turns of each branch circuit can be determined, the proper number of base turns is selected according to actual needs, the specific turns of each branch circuit is determined, and the phase shifting angle is determined by the harmonic elimination effect of the input side current. According to the phasor diagram and the established circuit diagram, in one product model, for example, the input voltage 444V, the output voltage 427V, the core leg width 75 mm, the core leg thickness 125 mm, the core leg window height 145 mm, the core leg window width 110 mm, the silicon steel sheet 27Q 120, the winding turns a' 2 b' 1 =139 turns; c 2 c' 2 =27 turns; c' 1 c 1 =27 turns, a 3 a' 2 =6 turns; b' 1 b 3 =6 turns; b (B) 1 B=2 turns, a 1 a 3 Under the working condition of 2 turns and 60kW of output power, not only the phase shift angle beta obtained by actual measurement is 20.12 degrees approximately 20 degrees, but also other harmonics except for a small amount of 17 th order and 19 th order harmonics are basically eliminated in the input current, and the actual measured THD (harmonic distortion rate) is only 6.98%.
Second, a three-phase to nine-phase step-up autotransformer, the voltage vector diagram is shown in fig. 4, the thick solid line in fig. 4 represents the distribution and connection of turns, and the thin solid line in fig. 4 represents the voltage phasors. The following mainly discloses the main different parts from the first step-down transformer.
As shown in fig. 4, the phasor diagram mapping step: the input low-voltage side phase voltage phasors OA, OB and OC are A, B, C as low-voltage line voltage triangles, and the voltage phasors OA are prolonged to lead OA 3 , Oa 3 For the phase voltage at the high-voltage output sideOa 1 AdvancingIn the followingOa 3 20 degrees, doOa 2 Lag behindOa 3 20 DEG and voltage phasorOa 1 =Oa 2 =Oa 3 。 As voltage phasor a 1 a' 1 //AB；a 2 a' 2 /(CA); and a 1 a' 1 = a 2 a' 2 . Coil as coila 3 A 1 ,// CA andABthe extension line is intersected withA 1 . The coil diagram and the voltage phasor diagram of the B phase and the C phase can be respectively made in the same way.
In fig. 4, the number of turns A 1 B+ B 1 b 3 = B 1 C+ C 1 c 3 = C 1 A+A 1 a 3 And is an integer, the number of turns c' 1 C=C c' 2 = a' 1 A=A a' 2 = b' 1 B=B b' 2 And is an integer.
Turns of coil A 1 A=B 1 B=C 1 C=A 1 a 3 =B 1 b 3 =C 1 c 3 Number of turns a of coil 1 a' 1 = a 2 a' 2 = b 1 b' 1 = b 2 b' 2 = c 1 c' 1 = c 2 c' 2 The number of turns of the coils can be an integer or a fraction, and can be specifically adjusted according to the outgoing line position of the tail end of the winding.
Fig. 5 shows a core limb a 1 ，B 1 ，C 1 Three-phase core type iron core columns are formed, and 7 coils are arranged on each iron core column.
Iron core columnA 1 There are 7 coils: a is that 1 A，AB，B 1 b 3 ，c' 2 C，C c' 1 ，a 1 a' 1 ，b' 2 b 2 ；
Iron core column B 1 There are 7 coils: b (B) 1 B，BC，C 1 c 3 ，a' 2 A，A a' 1 ，b 1 b' 1 ，c' 2 c 2 ；
Iron core column C 1 There are 7 coils: c (C) 1 C，CA，A 1 a 3 ，b' 2 B，B b' 1 ，c 1 c' 1 ，a' 2 a 2 ；
Iron core column A 1 ，B 1 ，C 1 The upper 21 coils are all of the same name ends of the coils are marked by 'x' in fig. 5, and the coils are tightly adhered to when connected.
In fig. 5, the same terminal jumper wire on different cores is connected specifically:
at the iron core columnA 1 Terminal B on 1 And core leg B 1 Terminal B on 1 Coupling;
at the iron core columnA 1 Terminal c 'on' 2 And core leg B 1 Terminal c 'on' 2 Coupling;
at the iron core columnA 1 Terminal c 'on' 1 And core leg C 1 Terminal c 'on' 1 Coupling;
at the iron core columnA 1 Terminal a 'on' 1 And core leg B 1 Terminal a 'on' 1 Coupling;
at the iron core columnA 1 Terminal b 'on' 2 And core leg C 1 Terminal b 'on' 2 Coupling;
at the iron core columnA 1 Upper terminal C and core limb C 1 The upper terminal C is connected;
at the iron core column B 1 Terminal C on 1 And core leg C 1 Terminal C on 1 Coupling;
at the iron core column B 1 Terminal a 'on' 2 And core leg C 1 Terminal a 'on' 2 Coupling;
at the iron core column B 1 Terminal b 'on' 1 And core leg C 1 Terminal b 'on' 1 Coupling;
at the iron core column B 1 Upper terminal a and core limbA 1 The upper terminal A is connected;
at the core limb C 1 Upper terminalA 1 And iron core columnA 1 Upper terminalA 1 Coupling;
at the core limb C 1 Terminal B and core limb B 1 The upper terminal B is connected;
iron core columnA 1 With main coilsABIron core column B 1 With main coilsBCCore limb C 1 With main coilsCAThese 3 coils form the main triangle coil of the transformer, the low-voltage side terminal is A, B, C connected with the external net, and the nine-phase terminal of the secondary high-voltage side is a 1 ，b 1 ，c 1 ；a 2 ，b 2 ，c 2 ；a 3 ，b 3 ，c 3 The output ends are respectively connected with the rectifier bridge. The coil linkage diagram of fig. 5 is identical to the phasor diagram of fig. 4, and the vector diagram of fig. 4 can be drawn according to the winding structure described above.
As shown in fig. 6, the secondary side terminal a of the step-down or step-up autotransformer 1 b 1 c 1 ，a 2 b 2 c 2 ，a 3 b 3 c 3 The outgoing lines of the three-phase rectifier bridge are respectively connected with a three-phase rectifier bridge, and the direct current output ends of the three-phase rectifier bridge are connected in parallel after passing through a common mode reactor and are connected to a direct current load. The three terminals A, B and C of the primary side of the autotransformer are connected to the power grid, so that the power conversion of the AC to DC can be realized, and the weakening effect of the current low-order harmonic wave of the primary side is good.
Claims (2)
1. Three-phase and nine-phase step-down autotransformer comprising three core columns (A) 1 、B 1 、C 1 ) The device is characterized in that 7 coils are respectively arranged on each iron core column; wherein, iron core column A1 is provided with a 1 a 3 、*a 3 a' 2 、*a' 2 b' 1 、*b' 1 b 3 、*B 1 B、*c 2 c' 2 、*c' 1 c 1 7 coils, iron core column B 1 Above there is B 1 b 3 、*b 3 b' 2 、*b' 2 c' 1 、*c' 1 c 3 、*C 1 C、*a 2 a' 2 、*a' 1 a 1 7 coils, iron core column C 1 Above is C 1 c 3 、*c 3 c' 2 、*c' 2 a' 1 、*a' 1 a 3 、*A 1 A、*b 2 b' 2 、*b' 1 b 1 7 coils (same name end of coil); the same terminal jumper wire on different iron cores is connected, three high-voltage terminals A, B, C are connected with an external net, nine terminals a 1 ，b 1 ，c 1 、a 2 ，b 2 ，c 2 、a 3 ，b 3 ，c 3 Forming a secondary low-voltage side outlet terminal;
turns of coil A 1 b 3 +B 1 B＝B 1 c 3 +C 1 C＝C 1 a 3 +A 1 A is an integer, the number of turns a 1 a' 1 ＝a 2 a' 2 ＝b 1 b' 1 ＝b 2 b' 2 ＝c 1 c' 1 ＝c 2 c' 2 And is an integer, the number of turns a 3 a' 1 ＝a 3 a' 2 ＝b 3 b' 1 ＝b 3 b' 2 ＝c 3 c' 1 ＝c 3 c' 2 Turns of coil A 1 a 3 ＝B 1 b 3 ＝C 1 c 3 ＝A 1 A＝B 1 B＝C 1 C；
Three groups of terminals a on the secondary side of the autotransformer 1 ，b 1 ，c 1 、a 2 ，b 2 ，c 2 、a 3 ，b 3 ，c 3 Each three-phase rectifier bridge is connected and then connected in parallel after passing through a common mode reactor;
wherein, iron core column A 1 With a main coil a 3 b 3 Iron core column B 1 With main coil b 3 c 3 Core limb C 1 With a main coil c 3 a 3 The 3 coils form a main triangle coil group of the transformer, and three-phase terminals on the high-voltage side are marked as A, B and C and are connected with an external network; the nine-phase terminal of the secondary low-voltage side is marked as a 1 ，b 1 ，c 1 ；a 2 ，b 2 ，c 2 ；a 3 ，b 3 ，c 3 The output ends are respectively connected with the rectifier bridge.
2. The three-phase and nine-phase boosting autotransformer comprises three iron core columns (A 1 、B 1 、C 1 ) The device is characterized in that 7 coils are respectively arranged on each iron core column; wherein, iron core column A 1 Above are a 1 A、*A B、*B 1 b 3 、*c' 2 C、*C c' 1 、*a 1 a' 1 、*b' 2 b 2 7 coils, iron core column B 1 Above there is B 1 B、*B C、*C 1 c 3 、*a' 2 A、*A a' 1 、*b 1 b' 1 、*c' 2 c 2 7 coils, iron core column C 1 Above is C 1 C、*C A、*A 1 a 3 、*b' 2 B、*B b' 1 、*c 1 c' 1 、*a' 2 a 2 7 coils (same name end of coil); the same terminal jumper wire on different iron cores is connected, three low-voltage terminals A, B, C are connected with an external network, nine terminals a 1 ，b 1 ，c 1 、a 2 ，b 2 ，c 2 、a 3 ，b 3 ，c 3 Forming a secondary high-voltage side outlet terminal;
turns of coil A 1 B+B 1 b 3 ＝B 1 C+C 1 c 3 ＝C 1 A+A 1 a 3 And is an integer, the number of turns c' 1 C＝C c' 2 ＝a' 1 A＝A a' 2 ＝b' 1 B＝Bb' 2 And is an integer, the number of turns A 1 A＝B 1 B＝C 1 C＝A 1 a 3 ＝B 1 b 3 ＝C 1 c 3 Number of turns a of coil 1 a' 1 ＝a 2 a' 2 ＝b 1 b' 1 ＝b 2 b' 2 ＝c 1 c' 1 ＝c 2 c' 2 ；
Three groups of terminals a on the secondary side of the autotransformer 1 ，b 1 ，c 1 、a 2 ，b 2 ，c 2 、a 3 ，b 3 ，c 3 Each three-phase rectifier bridge is connected and then connected in parallel after passing through a common mode reactor;
iron core column A 1 The main coil AB and the iron core column B are arranged on the upper part 1 The main coil BC is arranged on the iron core column C 1 The main coil CA is arranged on the transformer, the 3 coils form a main triangle coil of the transformer, a terminal of the low-voltage side is marked as A, B, C and connected with an external network, and a nine-phase terminal of the secondary high-voltage side is marked as a 1 ，b 1 ，c 1 ；a 2 ，b 2 ，c 2 ；a 3 ，b 3 ，c 3 The output ends are respectively connected with the rectifier bridge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811565341.8A CN109545528B (en) | 2018-12-20 | 2018-12-20 | Three-phase-change nine-phase step-up and step-down autotransformer |
Applications Claiming Priority (1)
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| CN101635514A (en) * | 2009-08-27 | 2010-01-27 | 北京交通大学 | High-voltage power circuit adopting multi-split transformer |
| CN101635198A (en) * | 2009-06-30 | 2010-01-27 | 东莞市光华实业有限公司 | 36-pulse high-power frequency conversion rectifier transformer |
| CN103594237A (en) * | 2013-11-28 | 2014-02-19 | 佛山市欧立电子有限公司 | 18-pulse phase shift rectifier transformer |
| CN105321694A (en) * | 2014-07-11 | 2016-02-10 | 波音公司 | Symmetrical step-up and step-down autotransformer delta topology |
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| CA2418315A1 (en) * | 2002-12-24 | 2004-06-24 | Delta Transformers Of Canada (1999) Ltd. | Field-adjustable phase shifting transformer |
| US7049921B2 (en) * | 2003-08-12 | 2006-05-23 | Owen Donald W | Auto-transformer for use with multiple pulse rectifiers |
| FR2870039B1 (en) * | 2004-05-07 | 2006-08-04 | Thales Sa | AUTOTRANSFORMER WITH 40 DEGREES |
| FR2875971B1 (en) * | 2004-09-24 | 2006-11-10 | Thales Sa | ALTERNATIVE-CONTINUOUS CONVERTER FOR AERONAUTICS |
| US7772953B2 (en) * | 2008-12-16 | 2010-08-10 | The Boeing Company | Symmetrical auto transformer delta topologies |
| CN102201749A (en) * | 2011-06-28 | 2011-09-28 | 江苏华鹏变压器有限公司 | Three-phase 48-pulse rectifying transformer |
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| CN101635198A (en) * | 2009-06-30 | 2010-01-27 | 东莞市光华实业有限公司 | 36-pulse high-power frequency conversion rectifier transformer |
| CN101635514A (en) * | 2009-08-27 | 2010-01-27 | 北京交通大学 | High-voltage power circuit adopting multi-split transformer |
| CN103594237A (en) * | 2013-11-28 | 2014-02-19 | 佛山市欧立电子有限公司 | 18-pulse phase shift rectifier transformer |
| CN105321694A (en) * | 2014-07-11 | 2016-02-10 | 波音公司 | Symmetrical step-up and step-down autotransformer delta topology |
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