Delta Yanbian 24-pulse autotransformer

Abstract

The present invention provides a triangular extension 24-pulse autotransformer, which includes three phases, the three phases include A phase, B phase and C phase, the structures of the six coils are the same, and the structures of the A phase, B phase and C phase are the same; each phase primary and each phase secondary respectively include two windings and are assembled together to form six coils; the two windings of each phase primary and a winding of the secondary of the phase are sequentially connected, and the middle lead-out end of the two windings of each phase primary extends another winding of the secondary of the phase, and the six coil structures generate four groups of three-phase AC voltages, and the phases of the four groups of three-phase AC voltages differ by 15° electrical angle. Compared with the related art, the triangular extension 24-pulse autotransformer of the present invention has a simple winding structure, a small volume and a low transformer equivalent capacity.

Description

Technical Field

[0001] The invention relates to the technical field of electric energy conversion, and in particular to a delta-Yanbian 24-pulse autotransformer. Background Art

[0002] With the rapid development of industry, rectifier transformers are increasingly used in electrolysis, electrochemistry, smelting, electroplating, oxidation, coloring, electrophoresis, aviation, and power traction. Rectifier transformers can be divided into 12-pulse rectifier transformers, 18-pulse rectifier transformers, 24-pulse rectifier transformers, etc. according to the number of pulses.

[0003] In the related art, rectifier transformers are commonly used 12-pulse isolation transformers, 18-pulse isolation transformers, and 24-pulse isolation transformers, among which the higher the number of pulses, the smaller the input current harmonic content and the lower the output voltage pulsation. Since all the energy of the isolation transformer is coupled through the transformer, the transformer equivalent capacity is large, which increases the volume and weight of the system; the higher the number of pulses, the lower the THD distortion rate. The total harmonic content of the 18-pulse autotransformer is about 10%, and the total harmonic content of the 24-pulse autotransformer is about 7.5%. In addition, the windings of the rectifier transformer in the related art are generally 3 windings, and the winding process is complicated, which makes the manufacturing process and operation of the transformer complicated. At the same time, the transformer is large in size and the heat dissipation effect is not good. The current equivalent capacity of the 24-pulse isolation transformer is: P = IU, and the equivalent capacity of the autotransformer is: P = 0.5IU, which increases the material cost and the process manufacturing time. Summary of the invention

[0004] The object of the present invention is to provide a delta-extended 24-pulse autotransformer with a simple winding structure, small volume and low transformer equivalent capacity, with an equivalent capacity of about 0.1IU, in view of the deficiencies in the prior art.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The present invention provides a triangular extended 24-pulse autotransformer, comprising three phases, wherein the three phases include an A phase, a B phase and a C phase, each phase primary side and each phase secondary side respectively include two windings and are assembled together to form six coils; the structures of the six coils are the same, and the structures of the A phase, the B phase and the C phase are the same;

[0007] Among them, the first winding Np1 of the A-phase primary, the second winding Np2 of the A-phase primary and the first winding Ns1 of the A-phase secondary are connected in sequence, and the middle lead-out ends of the first winding Np1 of the A-phase primary and the second winding Np2 of the A-phase primary are connected to the second winding Ns2 of the A-phase secondary; wherein the connection terminals of the first winding Np1 of the A-phase primary of the two A-phase coils are both the common terminal n, the connection terminals of the second winding Np2 of the A-phase primary of the two A-phase coils are both the input terminals A1 of the triangle extended 24-pulse autotransformer, the connection terminals of the first winding Ns1 of the A-phase secondary of the two A-phase coils are respectively the voltage output terminals c2 and b4 of the triangle extended 24-pulse autotransformer, and the connection terminals of the second winding Ns2 of the A-phase secondary of the two A-phase coils are respectively the voltage output terminals c1 and b3 of the triangle extended 24-pulse autotransformer;

[0008] Among them, the connection terminals of the first winding Np1 of the B-phase primary of the two B-phase coils are all the common terminal n, and the connection terminals of the second winding Np2 of the B-phase primary of the two B-phase coils are all the input terminals B1 of the triangle extension 24-pulse autotransformer; the connection terminals of the first winding Np1 of the C-phase primary of the two C-phase coils are all the common terminal n, and the connection terminals of the second winding Np2 of the C-phase primary of the two C-phase coils are all the input terminals C1 of the triangle extension 24-pulse autotransformer; the common terminal n of the A-phase primary, the common terminal n of the B-phase primary and the common terminal n of the C-phase primary are all connected, and the winding corresponding to the input terminal A1 of the A-phase primary, the winding corresponding to the input terminal B1 of the B-phase primary and the winding corresponding to the input terminal C1 of the C-phase primary form a triangle structure;

[0009] The triangle Yanbian 24-pulse autotransformer generates four groups of three-phase AC voltages through six coil structures, wherein the voltages of the first group of leading voltage output terminals a1, b1 and c1 are Ua1, Ub1 and Uc1 respectively, the voltages of the second group of leading voltage output terminals a2, b2 and c2 are Ua2, Ub2 and Uc2, the voltages of the first group of lagging voltage output terminals a3, b3 and c3 are Ua3, Ub3 and Uc3, the voltages of the second group of lagging voltage output terminals a4, b4 and c42 are Ua4, Ub4 and Uc4, and the phases of the four groups of three-phase AC voltages differ by 15° electrical angle.

[0010] Furthermore, the voltage leading phase difference of the first group of leading voltage output terminals a1, b1 and c1 is 7.5° electrical angle, the voltage leading phase difference of the second group of leading voltage output terminals a2, b2 and c2 is 22.5° electrical angle, the voltage lagging phase difference of the first group of lagging voltage output terminals a3, b3 and c3 is 7.5° electrical angle, and the voltage lagging phase difference of the second group of lagging voltage output terminals a4, b4 and c42 is 22.5° electrical angle.

[0011] Furthermore, the first winding Np1 of the B-phase primary, the second winding Np2 of the B-phase primary, and the first winding Ns1 of the B-phase secondary are connected in sequence, and the middle lead-out ends of the first winding Np1 of the B-phase primary and the second winding Np2 of the B-phase primary are connected to the second winding Ns2 of the B-phase secondary;

[0012] Among them, the connection terminals of the first winding Ns1 of the B-phase secondary side of the two B-phase coils are respectively the voltage output terminals a2 and c4 of the triangle extension 24-pulse autotransformer, and the connection terminals of the second winding Ns2 of the B-phase secondary side of the two B-phase coils are respectively the voltage output terminals a1 and c3 of the triangle extension 24-pulse autotransformer.

[0013] Furthermore, the first winding Np1 of the C-phase primary, the second winding Np2 of the C-phase primary, and the first winding Ns1 of the C-phase secondary are connected in sequence, and the middle lead-out ends of the first winding Np1 of the C-phase primary and the second winding Np2 of the C-phase primary are connected to the second winding Ns2 of the C-phase secondary;

[0014] Among them, the connection terminals of the first winding Ns1 of the C-phase secondary side of the two C-phase coils are respectively the voltage output terminals a4 and b2 of the triangle extension 24-pulse autotransformer, and the connection terminals of the second winding Ns2 of the C-phase secondary side of the two C-phase coils are respectively the voltage output terminals a3 and b1 of the triangle extension 24-pulse autotransformer.

[0015] Furthermore, the number of turns of the first winding Np1 of the primary side of the A phase, the B phase and the C phase is SNp1, the number of turns of the second winding Np2 of the primary side of the A phase, the B phase and the C phase is SNp2, the number of turns of the first winding Ns1 of the secondary side of the A phase, the B phase and the C phase is SNs1, the number of turns of the second winding Ns2 of the secondary side of the A phase, the B phase and the C phase is SNs2, and the turns ratio between the windings satisfies:

[0016] SNp1:SNp2=1:0.0176;

[0017] SNp1:SNs1=1:0.246;

[0018] SNp1:SNs2=1:0.088;

[0019] SNp1:SNp2:SNs1:SNs2=11.4:0.2:2.8:1.

[0020] Furthermore, the triangle-Yanbian 24-pulse autotransformer obtains the four groups of three-phase AC voltages through an asymmetric vector synthesis method.

[0021] Furthermore, the voltages of the first group of leading voltage output terminals a1, b1 and c1 and the voltages of the second group of leading voltage output terminals a2, b2 and c2 constitute a group of 12-phase output voltage vectors, wherein the vector lengths of voltage Ua1, voltage Ub1, voltage Uc1, voltage Ua2, voltage Ub2 and voltage Uc2 are equal.

[0022] Furthermore, the voltages of the first group of lagging voltage output terminals a3, b3 and c3 and the voltages of the second group of lagging voltage output terminals a4, b4 and c42 constitute another group of the 12-phase output voltage vectors, wherein the vector lengths of voltage Ua3, voltage Ub3, voltage Uc3, voltage Ua4, voltage Ub4 and voltage Uc4 are equal.

[0023] Furthermore, the voltage amplitudes of the two groups of the 12-phase output voltage vectors are equal and the phase difference is 15° electrical angle.

[0024] Beneficial effects of the present invention: In the present invention, the three phases of the triangle extended side 24-pulse autotransformer include phase A, phase B and phase C, and each phase primary and each phase secondary include two windings respectively and are assembled together to form six coils; and the structures of the six coils are all the same, so that the structures of the A phase, B phase and C phase are all the same; the connection mode of the triangle extended side 24-pulse autotransformer is set as follows: the two windings of each phase primary side and a winding of the secondary side of the phase are connected in sequence, and the middle lead-out ends of the two windings of each phase primary side extend another winding of the secondary side of the phase; each phase of the structure only needs 4 windings, and the winding is a triangle extended side structure, the winding process is simple, and the same body is composed of six coils, the volume is small, the heat dissipation of the transformer is convenient, and the manufacturing process is simple to operate, so that the winding structure of the triangle extended side 24-pulse autotransformer of the present invention is simple and the volume is small. In addition, the triangular-extending 24-pulse autotransformer of the present invention generates four groups of three-phase AC voltages through six coil structures, and the phases of the four groups of three-phase AC voltages differ by 15° electrical angle, so that the triangular-extending 24-pulse autotransformer of the present invention has a low equivalent capacity, while saving material costs and production time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the coil structure of the triangular Yanbian 24-pulse autotransformer of the present invention;

[0026] Figure 2 It is the circuit principle diagram of the triangular Yanbian 24-pulse autotransformer of the present invention;

[0027] Figure 3 It is the output voltage vector diagram of the triangular Yanbian 24-pulse autotransformer of the present invention;

[0028] Figure 4It is a schematic diagram of voltage relationship in the equivalent capacity calculation of the triangle Yanbian 24-pulse autotransformer of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to specific embodiments.

[0030] The invention discloses a triangular extended 24-pulse autotransformer.

[0031] See also Figure 1 , Figure 1 It is a schematic diagram of the coil structure of the triangle Yanbian 24-pulse autotransformer of the present invention.

[0032] The triangular extension 24-pulse autotransformer includes three phases, and the three phases include phase A, phase B and phase C. Each phase primary and each phase secondary respectively include two windings and are assembled together to form six coils. The triangular extension 24-pulse autotransformer is divided into two groups of coils, the upper group of coils is 3, and the lower group of coils is 3; a total of six coils constitute the triangular extension 24-pulse autotransformer.

[0033] The structures of the six coils are all the same, and the structures of the A phase, B phase and C phase are all the same.

[0034] See also Figure 2 , Figure 2 The circuit diagram of the triangular extension 24-pulse autotransformer of the present invention is shown in FIG.

[0035] The two primary windings of each phase are: phase A: Np1, Np2; phase B: Np1, Np2; phase C: Np1, Np2.

[0036] The two windings on the secondary side of each phase are: phase A: Ns1, Ns2; phase B: Ns1, Ns2; phase C: Ns1, Ns2.

[0037] The six coil structures and winding connection methods of the triangle Yanbian 24-pulse autotransformer are as follows:

[0038] The first winding Np1 of the primary side of phase A, the second winding Np2 of the primary side of phase A and the first winding Ns1 of the secondary side of phase A are connected in sequence, and the middle lead-out ends of the first winding Np1 of the primary side of phase A and the second winding Np2 of the primary side of phase A are connected to the second winding Ns2 of the secondary side of phase A.

[0039] Among them, the connection terminal of the first winding Np1 of the A-phase primary side of the two A-phase coils is the common terminal n, the connection terminal of the second winding Np2 of the A-phase primary side of the two A-phase coils is the input terminal A1 of the triangle extension 24-pulse autotransformer, the connection terminal of the first winding Ns1 of the A-phase secondary side of the two A-phase coils is respectively the voltage output terminal c2 and b4 of the triangle extension 24-pulse autotransformer, and the connection terminal of the second winding Ns2 of the A-phase secondary side of the two A-phase coils is respectively the voltage output terminal c1 and b3 of the triangle extension 24-pulse autotransformer.

[0040] The first winding Np1 of the B-phase primary, the second winding Np2 of the B-phase primary and the first winding Ns1 of the B-phase secondary are connected in sequence, and the middle lead-out ends of the first winding Np1 of the B-phase primary and the second winding Np2 of the B-phase primary are connected to the second winding Ns2 of the B-phase secondary.

[0041] The connection terminals of the first winding Np1 of the B-phase primary of the two B-phase coils are the common terminal n, and the connection terminals of the second winding Np2 of the B-phase primary of the two B-phase coils are the input terminal B1 of the triangle extension 24-pulse autotransformer. The connection terminals of the first winding Ns1 of the B-phase secondary of the two B-phase coils are the voltage output terminals a2 and c4 of the triangle extension 24-pulse autotransformer, and the connection terminals of the second winding Ns2 of the B-phase secondary of the two B-phase coils are the voltage output terminals a1 and c3 of the triangle extension 24-pulse autotransformer.

[0042] The first winding Np1 of the C phase primary, the second winding Np2 of the C phase primary and the first winding Ns1 of the C phase secondary are connected in sequence, and the middle lead ends of the first winding Np1 of the C phase primary and the second winding Np2 of the C phase primary are connected to the second winding Ns2 of the C phase secondary.

[0043] The connection terminals of the first winding Np1 of the C-phase primary of the two C-phase coils are the common terminal n, and the connection terminals of the second winding Np2 of the C-phase primary of the two C-phase coils are the input terminal C1 of the triangle extension 24-pulse autotransformer. The connection terminals of the first winding Ns1 of the C-phase secondary of the two C-phase coils are the voltage output terminals a4 and b2 of the triangle extension 24-pulse autotransformer, and the connection terminals of the second winding Ns2 of the C-phase secondary of the two C-phase coils are the voltage output terminals a3 and b1 of the triangle extension 24-pulse autotransformer.

[0044] The common terminal n of the primary side of phase A, the common terminal n of the primary side of phase B, and the common terminal n of the primary side of phase C are all connected, and the winding corresponding to the input terminal A1 of the primary side of phase A, the winding corresponding to the input terminal B1 of the primary side of phase B, and the winding corresponding to the input terminal C1 of the primary side of phase C form a triangle structure. That is, the primary windings A1-n, B1-n, and C1-n form a triangle. The two windings of the primary side of each phase are sequentially connected to the winding of a secondary side of the phase, that is, the two windings of the primary side of each phase extend the winding of a secondary side, and the middle lead-out end of the two windings of the primary side of each phase extends the winding of another secondary side of the phase. Each phase of this structure only needs 4 windings, and the winding is a triangular extended side structure, the winding process is simple, and it is composed of six wire packages in the same body, which is small in size, convenient for heat dissipation of the transformer, and the manufacturing process is simple to operate, so that the triangular extended side 24-pulse autotransformer winding structure of the present invention is simple and small in size.

[0045] The triangular Yanbian 24-pulse autotransformer generates four groups of three-phase AC voltages through six coil structures, wherein the voltages of the first group of leading voltage output terminals a1, b1 and c1 are Ua1, Ub1 and Uc1 respectively, and the voltages of the second group of leading voltage output terminals a2, b2 and c2 are Ua2, Ub2 and Uc2. The voltages of the first group of lagging voltage output terminals a3, b3 and c3 are Ua3, Ub3 and Uc3. The voltages of the second group of lagging voltage output terminals a4, b4 and c42 are Ua4, Ub4 and Uc4.

[0046] The voltage leading phase difference of the first group of leading voltage output terminals a1, b1 and c1 is 7.5° electrical angle, the voltage leading phase difference of the second group of leading voltage output terminals a2, b2 and c2 is 22.5° electrical angle, the voltage lagging phase difference of the first group of lagging voltage output terminals a3, b3 and c3 is 7.5° electrical angle, and the voltage lagging phase difference of the second group of lagging voltage output terminals a4, b4 and c42 is 22.5° electrical angle.

[0047] The phases of the four groups of three-phase AC voltages differ by 15° electrical angle.

[0048] To realize the above voltage vector construction, the number of turns of the first winding Np1 of the primary side of the A phase, the B phase and the C phase is SNp1, the number of turns of the second winding Np2 of the primary side of the A phase, the B phase and the C phase is SNp2, the number of turns of the first winding Ns1 of the secondary side of the A phase, the B phase and the C phase is SNs1, and the number of turns of the second winding Ns2 of the secondary side of the A phase, the B phase and the C phase is SNs2. The turns ratio between the windings satisfies:

[0049] SNp1:SNp2=1:0.0176;

[0050] SNp1:SNs1=1:0.246;

[0051] SNp1:SNs2=1:0.088;

[0052] SNp1:SNp2:SNs1:SNs2=11.4:0.2:2.8:1.

[0053] See also Figure 3 , Figure 3 It is the output voltage vector diagram of the triangular Yanbian 24-pulse autotransformer of the present invention.

[0054] The triangular extended 24-pulse autotransformer obtains the four groups of three-phase AC voltages by an asymmetric vector synthesis method. The voltages of the first group of leading voltage output terminals a1, b1 and c1 and the voltages of the second group of leading voltage output terminals a2, b2 and c2 constitute a group of 12-phase output voltage vectors.

[0055] The vector lengths of voltage Ua1, voltage Ub1, voltage Uc1, voltage Ua2, voltage Ub2 and voltage Uc2 are equal. In this embodiment, the equal voltage vector lengths actually mean that the voltage vector lengths are approximately equal, and a certain degree of voltage difference is acceptable.

[0056] The voltages of the first group of lagging voltage output terminals a3, b3 and c3 and the voltages of the second group of lagging voltage output terminals a4, b4 and c42 constitute another group of the 12-phase output voltage vectors, wherein the vector lengths of voltage Ua3, voltage Ub3, voltage Uc3, voltage Ua4, voltage Ub4 and voltage Uc4 are equal.

[0057] The voltage amplitudes of the two groups of 12-phase output voltage vectors are equal and the phases differ by 15 electrical degrees. In this embodiment, the equal voltage amplitudes actually mean that the voltage amplitudes are approximately equal, and a certain degree of voltage difference is acceptable.

[0058] See also Figure 4 , Figure 4 This is a schematic diagram of the voltage relationship in the equivalent capacity calculation of the triangular Yanbian 24-pulse autotransformer of the present invention.

[0059] The equivalent capacity of the input terminal A1 is P, the current value of the input terminal A1 is I, and the voltage value of the input terminal A1 is U.

[0060] The voltage value between the input terminal A1 and the input terminal B1 is U1.

[0061] The voltage value between the input terminal A1 and the first group of leading voltage output terminals a1 is U3, and the current value between the two is I3.

[0062] The voltage value between the input terminal A1 and the second group of leading voltage output terminals a2 is U2, and the current value between the two is I2.

[0063] Among them, from I=P / U; I3≈0.45I; I2≈0.45I; I1≈I-I3-I2≈0.1I; U1=U; it can be calculated that: P≈I1U≈0.1IU.

[0064] It can be concluded that the equivalent capacity of the triangle-Yanbian 24-pulse autotransformer of the present invention is: P≈0.1IU. Therefore, the triangle-Yanbian 24-pulse autotransformer of the present invention has a low equivalent capacity and saves material cost and production time.

[0065] In the present invention, the three phases of the triangle extended side 24-pulse autotransformer include phase A, phase B and phase C, and each phase primary and each phase secondary include two windings respectively and are assembled together to form six coils; and the structures of the six coils are all the same, so that the structures of the phase A, phase B and phase C are all the same; the connection mode of the triangle extended side 24-pulse autotransformer is set as follows: the two windings of each phase primary and a winding of the secondary of the phase are connected in sequence, and the middle lead-out ends of the two windings of each phase primary extend another winding of the secondary of the phase; each phase of the structure only needs 4 windings, and the winding is a triangle extended side structure, the winding process is simple, and the same body is composed of six coils, the volume is small, the heat dissipation of the transformer is convenient, and the manufacturing process is simple to operate, so that the winding structure of the triangle extended side 24-pulse autotransformer of the present invention is simple and the volume is small. In addition, the triangular-extending 24-pulse autotransformer of the present invention generates four groups of three-phase AC voltages through six coil structures, and the phases of the four groups of three-phase AC voltages differ by 15° electrical angle, so that the triangular-extending 24-pulse autotransformer of the present invention has a low equivalent capacity, while saving material costs and production time.

[0066] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A triangular Yanbian 24-pulse autotransformer, comprising three phases, wherein the three phases include phase A, phase B and phase C, characterized in that: Each primary side of each phase and each secondary side of each phase respectively include two windings and are assembled together to form six coils; the structures of the six coils are the same, and the structures of the A phase, the B phase and the C phase are the same; Among them, the first winding Np1 of the A-phase primary, the second winding Np2 of the A-phase primary and the first winding Ns1 of the A-phase secondary are connected in sequence, and the middle lead-out ends of the first winding Np1 of the A-phase primary and the second winding Np2 of the A-phase primary are connected to the second winding Ns2 of the A-phase secondary; wherein the connection terminals of the first winding Np1 of the A-phase primary of the two A-phase coils are both the common terminal n, the connection terminals of the second winding Np2 of the A-phase primary of the two A-phase coils are both the input terminals A1 of the triangle extended 24-pulse autotransformer, the connection terminals of the first winding Ns1 of the A-phase secondary of the two A-phase coils are respectively the voltage output terminals c2 and b4 of the triangle extended 24-pulse autotransformer, and the connection terminals of the second winding Ns2 of the A-phase secondary of the two A-phase coils are respectively the voltage output terminals c1 and b3 of the triangle extended 24-pulse autotransformer; Among them, the connection terminal of the first winding Np1 of the B-phase primary of the two B-phase coils is the common terminal n, and the connection terminal of the second winding Np2 of the B-phase primary of the two B-phase coils is the input terminal B1 of the triangle extension 24-pulse autotransformer; the connection terminal of the first winding Np1 of the C-phase primary of the two C-phase coils is the common terminal n, and the connection terminal of the second winding Np2 of the C-phase primary of the two C-phase coils is the input terminal C1 of the triangle extension 24-pulse autotransformer; the winding corresponding to the input terminal A1 of the A-phase primary, the winding corresponding to the input terminal B1 of the B-phase primary and the winding corresponding to the input terminal C1 of the C-phase primary form a triangle structure; wherein the primary windings A1-n, B1-n and C1-n form a triangle; The triangle Yanbian 24-pulse autotransformer generates four groups of three-phase AC voltages through six coil structures, wherein the voltages of the first group of leading voltage output terminals a1, b1 and c1 are Ua1, Ub1 and Uc1 respectively, the voltages of the second group of leading voltage output terminals a2, b2 and c2 are Ua2, Ub2 and Uc2, the voltages of the first group of lagging voltage output terminals a3, b3 and c3 are Ua3, Ub3 and Uc3, the voltages of the second group of lagging voltage output terminals a4, b4 and c42 are Ua4, Ub4 and Uc4, and the phases of the four groups of three-phase AC voltages differ by 15° electrical angle; The voltage leading phase difference of the first group of leading voltage output terminals a1, b1 and c1 is 7.5° electrical angle, the voltage leading phase difference of the second group of leading voltage output terminals a2, b2 and c2 is 22.5° electrical angle, the voltage lagging phase difference of the first group of lagging voltage output terminals a3, b3 and c3 is 7.5° electrical angle, and the voltage lagging phase difference of the second group of lagging voltage output terminals a4, b4 and c42 is 22.5° electrical angle; The first winding Np1 of the primary side of the B phase, the second winding Np2 of the primary side of the B phase and the first winding Ns1 of the secondary side of the B phase are connected in sequence, and the middle lead-out end of the first winding Np1 of the primary side of the B phase and the second winding Np2 of the primary side of the B phase is connected to the second winding Ns2 of the secondary side of the B phase; The connection terminals of the first winding Ns1 of the B-phase secondary side of the two B-phase coils are the voltage output terminals a2 and c4 of the triangle extension 24-pulse autotransformer, and the connection terminals of the second winding Ns2 of the B-phase secondary side of the two B-phase coils are the voltage output terminals a1 and c3 of the triangle extension 24-pulse autotransformer; The first winding Np1 of the primary side of the C phase, the second winding Np2 of the primary side of the C phase, and the first winding Ns1 of the secondary side of the C phase are connected in sequence, and the middle lead-out ends of the first winding Np1 of the primary side of the C phase and the second winding Np2 of the primary side of the C phase are connected to the second winding Ns2 of the secondary side of the C phase; Among them, the connection terminals of the first winding Ns1 of the C-phase secondary side of the two C-phase coils are respectively the voltage output terminals a4 and b2 of the triangle extension 24-pulse autotransformer, and the connection terminals of the second winding Ns2 of the C-phase secondary side of the two C-phase coils are respectively the voltage output terminals a3 and b1 of the triangle extension 24-pulse autotransformer.

2. The delta-Yanbian 24-pulse autotransformer according to claim 1 is characterized in that: The number of turns of the first winding Np1 of the primary side of the A phase, the B phase and the C phase is SNp1, the number of turns of the second winding Np2 of the primary side of the A phase, the B phase and the C phase is SNp2, the number of turns of the first winding Ns1 of the secondary side of the A phase, the B phase and the C phase is SNs1, the number of turns of the second winding Ns2 of the secondary side of the A phase, the B phase and the C phase is SNs2, and the turns ratio between the windings satisfies: SNp1:SNp2=1:0.0176; SNp1:SNs1=1:0.246; SNp1:SNs2=1:0.088; SNp1:SNp2:SNs1:SNs2=11.4:0.2:2.8:

1.

3. The delta-Yanbian 24-pulse autotransformer according to claim 1 is characterized in that: The triangle Yanbian 24-pulse autotransformer obtains the four groups of three-phase AC voltages through an asymmetric vector synthesis method.

4. The delta-Yanbian 24-pulse autotransformer according to claim 1, characterized in that: The voltages of the first group of leading voltage output terminals a1, b1 and c1 and the voltages of the second group of leading voltage output terminals a2, b2 and c2 constitute a group of 12-phase output voltage vectors, wherein the vector lengths of voltage Ua1, voltage Ub1, voltage Uc1, voltage Ua2, voltage Ub2 and voltage Uc2 are equal.

5. The delta-Yanbian 24-pulse autotransformer according to claim 4, characterized in that: The voltages of the first group of lagging voltage output terminals a3, b3 and c3 and the voltages of the second group of lagging voltage output terminals a4, b4 and c42 constitute another group of the 12-phase output voltage vectors, wherein the vector lengths of voltage Ua3, voltage Ub3, voltage Uc3, voltage Ua4, voltage Ub4 and voltage Uc4 are equal.

6. The delta-Yanbian 24-pulse autotransformer according to claim 5, characterized in that: The voltage amplitudes of the two groups of 12-phase output voltage vectors are equal and the phase difference is 15° electrical angle.

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