Body arrangement structure of single 48-pulse hydrogen production rectifier transformer

Abstract

The utility model provides a device body arrangement structure of a single-machine 48-pulse hydrogen production rectifier transformer, the single-machine 48-pulse hydrogen production rectifier transformer comprises a left device body and a right device body, and high-voltage winding D connection, low-voltage winding d connection and low-voltage winding y connection of the left device body and the right device body are all combined into 24 pulses. The phase angle difference of the 24-pulse rectifier transformers of the left transformer body and the right transformer body is equivalent to 48 pulses in a 7.5-degree combination mode, each 24-pulse rectifier transformer is a shared three-column three-phase iron core, and a conjugate iron core with the 15-degree phase difference of a high-voltage winding is arranged between the upper portion and the lower portion of the three-column three-phase iron core. A channel is provided for phase difference excitation between the upper high-voltage winding of the three-column three-phase iron core and the lower high-voltage winding of the three-column three-phase iron core through the conjugate iron core, four rectifiers with 12 pulses and 15-degree phase difference can be dragged by the valve side of the single-machine 48-pulse rectifier transformer, and the one-to-four function can be effectively achieved; meanwhile, the size and the weight of the system are effectively reduced, the overall manufacturing cost is greatly reduced, and rapid industrialization of green hydrogen is facilitated.

Description

Technical Field

[0001] This article belongs to the technical field of rectifier transformer body, specifically relating to the body arrangement structure of a single-unit 48-pulse hydrogen production rectifier transformer. Background Technology

[0002] The hydrogen-electric coupling system includes the power grid as the electricity source, wind and photovoltaic power generation equipment, user loads, hydrogen energy storage equipment, and rectifier power supplies. The real-time conversion of renewable energy into electricity via wind and solar power generation equipment is the main source of electricity in hydrogen production through wind-solar hybrid power generation. This green electricity is supplied to the hydrogen electrolyzer via a hydrogen production rectifier transformer and rectifier, where it is converted into various green energy sources such as hydrogen, ammonia, and alcohols.

[0003] For large-scale 1000-2000 Nm³ / h water electrolysis hydrogen production rectifier units, multi-pulse thyristor rectifier systems are typically used. The rectifier transformer types mainly include a 6-pulse three-phase double-reverse star structure with a balancing reactor, a valve-side star-delta phase-shifting 12-pulse structure, and a grid-side phase-shifting + valve-side star-delta phase-shifting 24-pulse structure. A single 24-pulse system exhibits current harmonics of 5-6% and voltage harmonics of 0.9%, with a power factor ≥0.95. To improve the system power factor and reduce harmonic content, multi-pulse thyristor rectifier systems require additional filtering devices to achieve relatively ideal current and voltage harmonics. This conventional technology involves high investment and a large footprint, hindering the industrialization and promotion of green hydrogen. Utility Model Content

[0004] To address the aforementioned issues, this paper proposes a single-unit 48-pulse hydrogen production rectifier transformer with a transformer body arrangement structure. The transformer comprises two bodies, a left body and a right body. The high-voltage winding (D-connection), low-voltage winding (d-connection), and low-voltage winding (y-connection) of both the left and right bodies are combined to form a 24-pulse configuration. The phase shift angle of the high-voltage winding (D-connection) at the upper part of the left body is +1.875°, and the phase shift angle of the high-voltage winding (D-connection) at the lower part of the left body is -13.125°. The phase difference between the upper and lower portions of the high-voltage winding in the left body is 15°. The phase shift angle of the high-voltage winding (D-connection) at the upper part of the right body is +9.375°, and the phase shift angle of the high-voltage winding (D-connection) at the lower part of the right body is -5.625°. The phase difference between the upper and lower portions of the high-voltage winding in the right body is... The phase angle difference between the 24-pulse rectifier transformers in the left and right bodies is equivalent to 48 pulses when combined with a 7.5° phase angle. Each 24-pulse rectifier transformer has a shared three-limb three-phase iron core. A conjugate iron core with a 15° phase difference between the high-voltage windings is provided between the upper and lower parts of the three-limb three-phase iron core. The phase difference excitation between the upper high-voltage winding and the lower high-voltage winding of the three-limb three-phase iron core is provided by the conjugate iron core. The valve side of a single 48-pulse rectifier transformer can drive four 12-pulse rectifiers with a 15° phase difference, which can effectively realize the function of one-to-four, and also effectively reduce the size and weight of the system, and significantly reduce the overall cost, which is conducive to the rapid industrialization of green hydrogen.

[0005] The high-voltage winding D-connection phase shift angle of the left transformer body is +1.875° and -13.125°, which, combined with the low-voltage winding d-connection and low-voltage winding y-connection, forms 24 pulses. The high-voltage winding phase shift of the upper part of the left transformer body is +1.875°, which, combined with the low-voltage winding d-connection and low-voltage winding y-connection, forms 12 pulses. The high-voltage winding phase shift of the lower part of the left transformer body is -13.125°, which, combined with the low-voltage winding d-connection and low-voltage winding y-connection, forms 12 pulses. The phase difference between the upper and lower parts of the high-voltage winding of the left transformer body is 15°.

[0006] The phase shift angles of the high-voltage winding D-connection on the right transformer body are +9.375° and -5.625°, which, combined with the low-voltage winding d-connection and low-voltage winding y-connection, form 24 pulses. The phase shift angle of the high-voltage winding at the upper part of the right transformer body is +9.375°, which, combined with the low-voltage winding d-connection and low-voltage winding y-connection, forms 12 pulses. The phase shift angle of the high-voltage winding at the lower part of the right transformer body is -5.625°, which, combined with the low-voltage winding d-connection and low-voltage winding y-connection, forms 12 pulses. The phase difference between the upper and lower parts of the high-voltage winding on the right transformer body is 15°.

[0007] The conjugate core includes an upper yoke, side columns, middle columns, and a lower yoke. The upper and lower ends of the side columns and middle columns are respectively equipped with upper and lower yokes. The middle yoke is provided in the middle of the side columns and middle columns as a transverse partition. The parallel operation of the upper and lower high-voltage windings is achieved through the conjugate core to realize additional magnetic circuit isolation and independent operation. Each 24-pulse rectifier transformer shares a three-column core. Considering that when two transformers are combined, there is a 15° phase difference in the magnetic flux passing through the upper and lower columns on the grid side, a conjugate core is designed in the three-column core. The conjugate core can provide an additional magnetic circuit for the magnetic flux of the upper and lower columns when they are in different phases, thus realizing the magnetic isolation and independent operation of the upper and lower windings, and also effectively reducing the size and weight of the system. Beneficial effects

[0008] The single-unit 48-pulse thyristor rectifier transformer not only allows for wide-range and convenient adjustment of the valve-side voltage via on-load tap changer, but also achieves extremely low current and voltage harmonics, and improves the system's power factor and efficiency. It can meet the current requirements of large-scale 500~2000 Nm3 / h alkaline solution and ALK electrolyzers. The valve side of the single-unit 48-pulse rectifier transformer can drive four 12-pulse rectifiers with a 15° phase difference, effectively realizing the one-to-four function, while also effectively reducing the system's size and weight, and significantly reducing the overall cost, which is conducive to the rapid industrialization of green hydrogen.

[0009] Each 24-pulse rectifier transformer shares a three-limb core. Considering that when two transformers are operating in combination, there is a 15° phase difference in the magnetic flux passing through the upper and lower limbs on the grid side, a conjugate core is designed in the three-limb core. The conjugate core can provide an additional magnetic circuit for the magnetic flux of the upper and lower limbs under different phase conditions, which realizes the magnetic isolation and independent operation of the upper and lower windings, and also effectively reduces the size and weight of the system. Attached Figure Description

[0010] Figure 1 This is a schematic cross-sectional view of the body arrangement structure of a single-unit 48-pulse hydrogen production rectifier transformer.

[0011] Figure 2 It is a single-unit 48-pulse hydrogen production rectifier transformer with a body arrangement structure based on the phase shift principle of the left body 24-pulse high and low voltage windings;

[0012] Figure 3 It is a single-unit 48-pulse hydrogen production rectifier transformer with a body arrangement structure based on the phase shift principle of the right body 24-pulse high and low voltage windings;

[0013] Figure 4 This is a schematic diagram of a three-phase, three-column conjugate core of a single-unit 48-pulse hydrogen production rectifier transformer.

[0014] In the diagram: 1. Conjugate iron core, 2. Upper body, 3. Lower body, 4. Upper left body, 5. Lower left body, 6. Upper right body, 7. Lower right body, 8. Upper yoke of iron core, 9. Side post of iron core, 10. Middle yoke of iron core, 11. Middle post of iron core, 12. Lower yoke of iron core. Detailed Implementation

[0015] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0016] 1. Conjugate iron core, 2. Upper body, 3. Lower body, 4. Upper left body, 5. Lower left body, 6. Upper right body, 7. Lower right body, 8. Upper yoke of iron core, 9. Side post of iron core, 10. Middle yoke of iron core, 11. Middle post of iron core, 12. Lower yoke of iron core.

[0017] like Figure 1 , 2 As shown in Figures 3 and 4;

[0018] A single-unit 48-pulse hydrogen production rectifier transformer has a body arrangement structure. The transformer includes two bodies, a left body and a right body. The high-voltage winding (D-connection), low-voltage winding (d-connection), and low-voltage winding (y-connection) of both the left and right bodies are combined to form a 24-pulse configuration. The phase shift angle of the high-voltage winding (D-connection) at the upper part (4) of the left body is +1.875°, and the phase shift angle of the high-voltage winding (D-connection) at the lower part (5) of the left body is -13.125°. The upper and lower portions of the high-voltage winding of the left body are phase-shifted... The phase difference is 15°. The phase shift angle of the high-voltage winding D-connection on the upper part 6 of the right transformer body is +9.375°, and the phase shift angle of the high-voltage winding D-connection on the lower part 7 of the right transformer body is -5.625°. The phase difference between the upper and lower parts of the high-voltage winding on the right transformer body is 15°. The phase angle difference between the 24-pulse rectifier transformers on the left and right transformer bodies, combined with 7.5°, is equivalent to 48 pulses. Each 24-pulse rectifier transformer has a shared three-limb three-phase iron core. The upper and lower parts of the three-limb three-phase iron core... The three-limb, three-phase core 1 has a conjugate iron core with a 15° phase difference between its high-voltage windings. The phase difference excitation between the upper and lower high-voltage windings of the three-limb, three-phase iron core is provided by the conjugate iron core. The phase shift angles of the left high-voltage winding D-connection are +1.875° and -13.125°, combined with the low-voltage winding d-connection and low-voltage winding y-connection to form a 24-pulse configuration. The phase shift angles of the right high-voltage winding D-connection are +9.375° and -5.625°, combined with the low-voltage winding d-connection... The low-voltage winding is connected in a 24-pulse configuration. The conjugate core 1 includes an upper core yoke 8, a core side post 9, a core middle post 11, and a core lower yoke 12. The upper and lower ends of the core side post 9 and the core middle post 11 are respectively provided with the upper core yoke 8 and the core lower yoke 12. The core middle yoke 10 is provided in a transversely separated manner in the middle between the core side post 9 and the core middle post 11. The parallel operation of the upper high-voltage winding and the lower high-voltage winding is achieved by the conjugate core 1 to realize additional magnetic circuit isolation and independent operation.

[0019] Implementation example;

[0020] The upper four high-voltage windings on the left transformer body are phase-shifted by +1.875° and the low-voltage windings are connected by d and y to form 12 pulses. The lower five high-voltage windings on the left transformer body are phase-shifted by -13.125° and the low-voltage windings are connected by d and y to form 12 pulses. The phase difference between the upper and lower parts of the high-voltage windings on the left transformer body is 15°.

[0021] The upper 6 high-voltage windings of the right transformer body are phase-shifted by +9.375° and the low-voltage windings connected by d and y are combined to form 12 pulses. The lower 7 high-voltage windings of the right transformer body are phase-shifted by -5.625° and the low-voltage windings connected by d and y are combined to form 12 pulses. The phase difference between the upper and lower parts of the high-voltage windings of the right transformer body is 15°.

[0022] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A body arrangement structure for a single-unit 48-pulse hydrogen production rectifier transformer, characterized in that, The aforementioned single-unit 48-pulse hydrogen production rectifier transformer includes two sections: a left section and a right section. The high-voltage winding (D-connection), low-voltage winding (d-connection), and low-voltage winding (y-connection) of both the left and right sections are combined to form a 24-pulse configuration. The phase shift angle of the high-voltage winding (D-connection) at the upper part of the left section is +1.875°, and the phase shift angle of the high-voltage winding (D-connection) at the lower part of the left section is -13.125°. The phase difference between the upper and lower portions of the high-voltage winding in the left section is 15°. The phase shift angle of the high-voltage winding (D-connection) at the upper part of the right section is +9.375°, and the phase shift angle of the high-voltage winding (D-connection) at the lower part of the right section is... The phase difference between the upper and lower parts of the high-voltage winding of the right transformer body is 15°, and the phase difference between the 24-pulse rectifier transformers of the left and right transformer bodies is equivalent to 48 pulses when combined with a phase angle of 7.5°. Each 24-pulse rectifier transformer is a shared three-limb three-phase iron core. A conjugate iron core with a 15° phase difference between the high-voltage winding is provided between the upper and lower parts of the three-limb three-phase iron core. The phase difference excitation between the upper high-voltage winding and the lower high-voltage winding of the three-limb three-phase iron core is provided by the conjugate iron core.

2. The body arrangement structure of a single-unit 48-pulse hydrogen production rectifier transformer according to claim 1, characterized in that, The phase shift angles of the left high-voltage winding D-connection are +1.875° and -13.125°, which, together with the low-voltage winding d-connection and the low-voltage winding y-connection, form a 24-pulse configuration.

3. The transformer body arrangement structure of a single-unit 48-pulse hydrogen production rectifier transformer according to claim 1, characterized in that, The phase shift angles of the right high-voltage winding D-connection are +9.375° and -5.625°, which, together with the low-voltage winding d-connection and the low-voltage winding y-connection, form a 24-pulse configuration.

4. The body arrangement of a single 48-step hydrogen rectifier transformer according to claim 1, characterized in that, The conjugate core includes an upper yoke, side posts, middle posts, and a lower yoke. The upper and lower ends of the side posts and middle posts are respectively provided with upper and lower yokes, and the middle yoke is provided in a transverse partition between the side posts and middle posts.

5. The body arrangement of a single 48-step hydrogen rectifier transformer according to claim 1, characterized in that, The combination of the high-voltage winding phase shift of +1.875° and the low-voltage winding d-connection and low-voltage winding y-connection on the upper part of the left transformer body forms a 12-pulse configuration.

6. The transformer body arrangement structure of a single-unit 48-pulse hydrogen production rectifier transformer according to claim 1, characterized in that, The combination of the low-voltage winding phase shift of -13.125° and the low-voltage winding d-connection and low-voltage winding y-connection in the lower part of the left body is 12 pulses.

7. The body arrangement structure of a single-unit 48-pulse hydrogen production rectifier transformer according to claim 1, characterized in that, The combination of the high-voltage winding phase shift of +9.375° and the low-voltage winding d-connection and low-voltage winding y-connection on the upper part of the right transformer body forms a 12-pulse configuration.

8. The transformer body arrangement structure of a single-unit 48-pulse hydrogen production rectifier transformer according to claim 1, characterized in that, The combination of the low-voltage winding phase shift of -5.625° and the low-voltage winding d-connection and low-voltage winding y-connection in the lower part of the right body is 12 pulses.

9. The body arrangement structure of a single-unit 48-pulse hydrogen production rectifier transformer according to claim 1, characterized in that, The parallel operation of the upper high-voltage winding and the lower high-voltage winding is achieved through the conjugate iron core to realize additional magnetic circuit isolation and independent operation.

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