High-low voltage lead structure of single-machine 48-pulse hydrogen production rectifier transformer

Abstract

According to the high-low voltage lead structure of the single-machine 48-pulse hydrogen production rectifier transformer, a left device body, a right device body and a self-coupling modulation device body are arranged in an oil tank of the single-machine 48-pulse hydrogen production rectifier transformer, the self-coupling modulation device body is connected with the left device body and the right device body at the phase angle difference of 7.5 degrees, and the self-coupling modulation device body is powered by a grid-side three-phase power source. Power sources of the left transformer body and the right transformer body are output through the self-coupling modulation transformer body, a phase shift phase with the phase angle difference of 7.5 degrees is arranged between the left transformer body and the right transformer body, and four rectifiers with 12 pulses and 15-degree phase difference can be dragged by the valve side of a single 48-pulse rectifier transformer, so that the one-to-four function can be effectively realized, and the power consumption is reduced. 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] The present application belongs to the technical field of rectifier transformer lead structure, and particularly relates to a high-low voltage lead structure of a single-machine 48-pulse hydrogen rectifier transformer. BACKGROUND

[0002] The hydrogen power coupling system comprises a power grid, wind power and photovoltaic power generation equipment, user load, hydrogen energy storage equipment and rectifier power supply and the like as a power source. Renewable energy is converted into electric energy in real time through the wind and light power generation equipment, which is the main source of electric energy in the wind and light complementary power generation hydrogen production. Green electric energy is supplied to the hydrogen production electrolytic tank through the hydrogen production rectifier transformer and the rectifier, and is converted into hydrogen, ammonia, alcohol and other green energy.

[0003] For large-scale 1000-2000Nm3 / h electrolytic water hydrogen production rectifier devices, a multi-pulse thyristor rectifier system is usually used, and the rectifier transformer types mainly include 6-pulse three-phase double anti-star balanced reactor structure, valve side star angle phase shift 12-pulse structure, network side phase shift + valve side star angle phase shift 24-pulse structure and the like; single 24-pulse current harmonic is 5-6%, voltage harmonic is 0.9%, and the system power factor is greater than or equal to 0.95. In order to improve the system power factor and reduce the harmonic content, the multi-pulse thyristor rectifier system needs to increase the filtering device to realize the ideal current and voltage harmonic, and this conventional technology has high investment and large occupied area, which is not conducive to the popularization of green hydrogen industrialization. CONTENT OF THE INVENTION

[0004] In order to solve the above problems, a high and low voltage lead structure of single machine 48 pulse hydrogen rectifier transformer is provided, the oil tank of the single machine 48 pulse hydrogen rectifier transformer is internally provided with left body, right body and self-coupling modulator body, the self-coupling modulator body is connected with the left body and the right body with a phase angle difference of 7.5°, the self-coupling modulator body is powered by a network side three-phase power supply, the power supply of the left body and the right body is output through the self-coupling modulator body, a phase angle difference of 7.5° is arranged between the left body and the right body, a phase angle difference of 15° is arranged between the upper part and the lower part of the left body and the right body, the single machine 48 pulse rectifier transformer is provided with eight sets of electrically independent three-phase valve side windings, the phase angle difference between the four low-voltage winding d connections and the four low-voltage winding y connections of the single machine 48 pulse rectifier transformer is 30°, the magnetic circuit and electricity of the valve side winding of the left body lower part one low-voltage winding d connection and one low-voltage winding y connection and the valve side winding of the left body upper part one low-voltage winding d connection and one low-voltage winding y connection are completely independent and constitute a group of 24 pulse waves, the magnetic circuit and electricity of the valve side winding of the right body lower part one low-voltage winding d connection and one low-voltage winding y connection and the valve side winding of the right body upper part one low-voltage winding d connection and one low-voltage winding y connection are completely independent and constitute another group of 24 pulse waves, the four low-voltage winding d connections and the four low-voltage winding y connections of the valve side winding are equivalent to 48 pulse waves, the single machine 48 pulse thyristor rectifier transformer can not only realize the wide and convenient adjustment of the valve side voltage through the on-load voltage regulating switch, but also realize the extremely low current and voltage harmonic, improve the power factor and efficiency of the system, meet the current demand of large-scale 500-2000Nm3 / h caustic soda and ALK electrolytic cell, the valve side of the single machine 48 pulse rectifier transformer can drive four 12 pulse rectifiers with a phase difference of 15°, which not only effectively realizes the function of one driving four, but also effectively reduces the volume and weight of the system, greatly reduces the overall cost, is beneficial to the rapid industrialization of green hydrogen, the single machine 48 pulse rectifier transformer has eight sets of electrically independent three-phase valve side windings, the phase angle difference between the four d connections and the four y connections of the valve side winding is 30°, realizes the independent operation of the eight sets of valve side windings of the single machine, and effectively reduces the volume and weight of the system.

[0005] The self-coupling modulator body adjusts and controls the output side coil turns of the self-coupling modulator body through the on-load voltage regulating switch, the output side coil turns of the self-coupling modulator body adjust the wide adjustment of the output voltage, the output of the self-coupling modulator body is connected to the input of the left body and the right body, the core of the self-coupling modulator body is constant magnetic flux, the core of the left body and the right body is variable magnetic flux, the output voltage is wide adjustment by changing the output side coil turns of the self-coupling modulation through the on-load voltage regulating switch, the output of the self-coupling modulation is the input of the two rectifier transformer bodies, since the input side voltage of the rectifier transformer can change with different voltage levels due to the switching gear of the switch, the valve side voltage of the rectifier transformer also corresponds to the output of the different levels, that is, the core of the rectifier transformer realizes variable magnetic flux.

[0006] The high-voltage winding (D-connection) phase shift angles of the left transformer body are +1.875° and -13.125°, combined with the low-voltage winding (d-connection) and low-voltage winding (y-connection) for 24 pulses. The high-voltage winding phase shift angle of the upper left transformer body is +1.875°, combined with the low-voltage winding (d-connection) and low-voltage winding (y-connection) for 12 pulses. The high-voltage winding phase shift angle of the lower left transformer body is -13.125°, combined with the low-voltage winding (d-connection) and low-voltage winding (y-connection) for 12 pulses. The phase difference between the upper and lower parts of the high-voltage winding of the left transformer body is 15°. The high-voltage winding (D-connection) phase shift angles of the right transformer body are +9.375° and -5.625°, combined with the low-voltage winding (d-connection) and low-voltage winding (y-connection) for 24 pulses. The upper high-voltage winding is phase-shifted by +9.375° and the low-voltage winding (d-connection and y-connection) is combined to form 12 pulses. The lower high-voltage winding of the right transformer body is phase-shifted by -5.625° and the low-voltage winding (d-connection and y-connection) is combined to form 12 pulses. The phase difference between the upper and lower parts of the high-voltage winding of the right transformer body is 15°. Since the power supply of the rectifier transformers of the left and right transformer bodies shares the output of the autotransformer, the high-voltage coils of the two rectifier transformers must not only ensure that the conjugate core flux of the three-phase three-column is phase-shifted according to the 15° phase angle difference between the upper and lower parts, but also ensure that the phase angle difference between the left and right transformer bodies is 7.5°.

[0007] 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 through on-load tap changers, but also achieves extremely low current and voltage harmonics, and improves the power factor and efficiency of the system. It can meet the current requirements of large-scale 500-2000 Nm3 / h alkaline solutions 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 function of one-to-four, while also effectively reducing the size and weight of the system, and significantly reducing the overall cost, which is conducive to the rapid industrialization of green hydrogen.

[0009] The single-unit 48-pulse rectifier transformer has eight electrically independent three-phase valve-side windings. The phase angle difference between the four d-connection and four y-connection valve-side windings is 30°, which realizes the independent operation of the eight valve-side windings of a single unit, effectively reducing the size and weight of the system.

[0010] The output voltage can be adjusted by changing the number of turns of the output coil of the autotransformer through an on-load tap changer. The output of the autotransformer is the input of the two rectifier transformers. Since the input voltage of the rectifier transformer can change by different levels depending on the switch position, the valve-side voltage of the rectifier transformer also outputs a corresponding level difference, that is, the core of the rectifier transformer achieves variable flux.

[0011] Since the power supply of the left and right rectifier transformers shares the output of the autotransformer, the high-voltage coils of the two rectifier transformers must be phase-shifted according to the 15° phase angle difference between the upper and lower parts to ensure that the magnetic flux of the three-phase three-column conjugate core is phase-shifted according to the 15° phase angle difference, and the phase angle difference between the left and right sides must also be 7.5° phase-shifted. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the high-voltage lead connection of a single-unit 48-pulse hydrogen production rectifier transformer;

[0013] Figure 2 This is a schematic diagram of the low-voltage lead connection of a single-unit 48-pulse hydrogen production rectifier transformer;

[0014] Figure 3 This is a high-voltage winding lead structure diagram of a single-unit 48-pulse hydrogen production rectifier transformer;

[0015] Figure 4 This is a low-voltage lead connection structure diagram of a single-unit 48-pulse hydrogen production rectifier transformer;

[0016] In the diagram: 1. Left transformer body, 2. Right transformer body, 3. Autotransformer body, 4. Upper part of left transformer body, 5. Lower part of left transformer body, 6. Upper part of right transformer body, 7. Lower part of right transformer body. Detailed Implementation

[0017] 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.

[0018] Left transducer body 1, right transducer body 2, autotransformer body 3, upper left transducer body 4, lower left transducer body 5, upper right transducer body 6, lower right transducer body 7.

[0019] like Figure 1 , 2 As shown in Figures 3 and 4;

[0020] A high- and low-voltage lead structure for a single-unit 48-pulse hydrogen production rectifier transformer is disclosed. The transformer's tank contains a left transformer body 1, a right transformer body 2, and an autotransformer body 3. The autotransformer body is connected to both the left and right transformer bodies 1 and 2 with a phase angle difference of 7.5°. The autotransformer body is powered by a three-phase grid power supply. The power supply to both the left and right transformer bodies 1 and 2 is output through the autotransformer body 3. A phase connection is provided between the left and right transformer bodies 1 and 2. A 7.5° phase shift is achieved, with a 15° phase shift between the upper and lower parts of the left transformer body 1 and the right transformer body 2. The autotransformer body 3 controls the number of turns of its output coil via an on-load tap changer. Adjusting the number of turns of the output coil of the autotransformer body 3 allows for wide-range adjustment of the output voltage. The output of the autotransformer body 3 is connected to the input of the left transformer body 1 and the right transformer body 2. The core of the autotransformer body 3 has a constant magnetic flux. The cores of the left transformer body 1 and the right transformer body 2... The core is a variable flux winding. On the left side, the high-voltage winding (D-connection) with phase shift angles of +1.875° and -13.125°, combined with the low-voltage winding (d-connection and y-connection), forms a 24-pulse winding. On the right side, the high-voltage winding (D-connection) with phase shift angles of +9.375° and -5.625°, combined with the low-voltage winding (d-connection and y-connection), also forms a 24-pulse winding. On the upper left side, the high-voltage winding (4) with a phase shift of +1.875°, combined with the low-voltage winding (d-connection and y-connection), forms a 12-pulse winding. On the lower left side, the high-voltage winding (5) with a phase shift of +1.875°, combined with the low-voltage winding (d-connection and y-connection), forms a 12-pulse winding. The phase shift of the high voltage winding in the left transformer body 1 is -13.125°, and the combination of the low voltage winding d-connection and the low voltage winding y-connection forms 12 pulses. The phase difference between the upper and lower parts of the high voltage winding in the left transformer body 1 is 15°. The phase shift of the high voltage winding in the upper part of the right transformer body 6 is +9.375°, and the combination of the low voltage winding d-connection and the low voltage winding y-connection forms 12 pulses. The phase shift of the high voltage winding in the lower part of the right transformer body 7 is -5.625°, and the combination of the low voltage winding d-connection and the low voltage winding y-connection forms 12 pulses. The phase difference between the upper and lower parts of the high voltage winding in the right transformer body 2 is 15°.

[0021] Implementation example;

[0022] The single-unit 48-pulse rectifier transformer has eight electrically independent three-phase valve-side windings. The phase angle difference between the four low-voltage windings connected by d and the four low-voltage windings connected by y of the single-unit 48-pulse rectifier transformer is 30°. The valve-side winding with one low-voltage winding connected by d and one low-voltage winding connected by y in the lower part 5 of the left transformer body and the valve-side winding with one low-voltage winding connected by d and one low-voltage winding connected by y in the upper part 4 of the left transformer body form a 24-pulse group with completely independent magnetic and electrical circuits. The valve-side winding with one low-voltage winding connected by d and one low-voltage winding connected by y in the lower part 7 of the right transformer body and the valve-side winding with one low-voltage winding connected by d and one low-voltage winding connected by y in the upper part 6 of the right transformer body form another 24-pulse group with completely independent magnetic and electrical circuits. The combination of the four low-voltage windings connected by d and the four low-voltage windings connected by y is equivalent to a 48-pulse group.

[0023] 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 high- and low-voltage lead structure for a single-unit 48-pulse hydrogen production rectifier transformer, characterized in that, The single-unit 48-pulse hydrogen production rectifier transformer has a left transformer body, a right transformer body, and an autotransformer body inside its tank. The autotransformer body is connected to the left and right transformer bodies with a phase angle difference of 7.5°. The autotransformer body is powered by a three-phase grid power supply. The power supply to the left and right transformer bodies is output through the autotransformer body. A 7.5° phase shift is established between the left and right transformer bodies, and a 15° phase shift is established between the upper and lower parts of the left and right transformer bodies. The single-unit 48-pulse rectifier transformer has eight electrically independent three-phase valve-side windings. The single-unit 48-pulse rectifier transformer has four low-voltage windings... The phase angle difference between the d-connection and the four low-voltage winding y-connection valve-side windings is 30°. The valve-side windings of one low-voltage winding d-connection and one low-voltage winding y-connection in the lower part of the left transformer body and the valve-side windings of one low-voltage winding d-connection and one low-voltage winding y-connection in the upper part of the left transformer body form a 24-pulse group with completely independent magnetic and electrical circuits. The valve-side windings of one low-voltage winding d-connection and one low-voltage winding y-connection in the lower part of the right transformer body and the valve-side windings of one low-voltage winding d-connection and one low-voltage winding y-connection in the upper part of the right transformer body form another 24-pulse group with completely independent magnetic and electrical circuits. The combination of the four low-voltage winding d-connection and four low-voltage winding y-connection valve-side windings is equivalent to 48 pulses.

2. The high and low voltage lead structure of a single-unit 48-pulse hydrogen production rectifier transformer according to claim 1, characterized in that, The autotransformer body adjusts the number of turns of the output coil of the autotransformer body through an on-load tap changer. The number of turns of the output coil of the autotransformer body adjusts the wide range of output voltage adjustment. The output of the autotransformer body is connected as the input of the left and right bodies. The iron core of the autotransformer body is a constant magnetic flux, while the iron cores of the left and right bodies are variable magnetic flux.

3. The high and low voltage lead 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.

4. The high and low voltage lead 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.

5. The high and low voltage lead structure of a single-unit 48-pulse hydrogen production rectifier transformer according to claim 1, characterized in that, The upper high-voltage winding of the left transformer body with a phase shift of +1.875° and the combination of the low-voltage winding d-connection and the low-voltage winding y-connection form 12 pulses. The lower high-voltage winding of the left transformer body with a phase shift of -13.125° and the combination of the low-voltage winding d-connection and the low-voltage winding y-connection form 12 pulses. The phase difference between the upper and lower parts of the high-voltage winding of the left transformer body is 15°.

6. The high and low voltage lead structure of a single-unit 48-pulse hydrogen production rectifier transformer according to claim 1, characterized in that, The upper high-voltage winding of the right transformer body is phase-shifted by +9.375° and the combination of the low-voltage winding d-connection and the low-voltage winding y-connection forms 12 pulses. The lower high-voltage winding of the right transformer body is phase-shifted by -5.625° and the combination of the low-voltage winding d-connection and the low-voltage winding y-connection forms 12 pulses. The phase difference between the upper and lower parts of the high-voltage winding of the right transformer body is 15°.

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