Hydrogen production rectifier transformer

Abstract

The invention provides a hydrogen production rectifier transformer, and relates to the technical field of transformers. The main voltage regulating winding and the auxiliary voltage regulating winding are arranged, the main voltage regulating winding and the high-voltage winding are connected through the on-load voltage regulating switch, and the auxiliary voltage regulating winding and the high-voltage winding pass through the non-excitation voltage regulating switch. The access proportion of the main voltage regulating winding is adjusted through the on-load voltage regulating switch, so that variable flux voltage regulation is realized; when the hydrogen production rectifier transformer is the power supply of the IGBT rectifier equipment, the access proportion of the auxiliary voltage regulation winding is adjusted through the non-excitation voltage regulation switch, and constant magnetic flux voltage regulation is realized; the thyristor rectification and the IGBT rectification are matched at the same time, the investment cost can be reduced, meanwhile, the occupied area is reduced, and the problems that when the thyristor rectification and the IGBT rectification are used in a combined mode, the investment cost is high, and the occupied area is large are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformers, in particular to a hydrogen production rectifier transformer. BACKGROUND

[0002] At present, there are two commonly used technologies for hydrogen production rectification, namely thyristor rectification and IGBT rectification.

[0003] The advantage of thyristor rectification is high efficiency under high load conditions, which meets the high power output, but the efficiency decreases significantly when the load is below 50%, and the rectifier cost is low. The advantage of IGBT rectification is stable efficiency in a wide load range, even if the load rate is as low as 10-20%, the efficiency can still remain above 85%, and the rectifier cost is high. By combining the two rectification methods of thyristor rectification and IGBT rectification, thyristor rectification is used under high load, and IGBT rectification is used under low load, which can realize the overall efficiency improvement in the full load range and reduce energy consumption.

[0004] However, thyristor rectification requires the use of on-load voltage regulating transformers to achieve a wide range of power regulation. IGBT rectification requires the use of no-field voltage regulating transformers, which have a small voltage regulating range, generally ±5%, and the low-voltage winding is usually a double-split structure and meets the single branch operation. In order to meet the mixed use requirements of the two rectification methods, two transformers need to be configured, which has high investment cost and large floor area.

[0005] There is an urgent need for a hydrogen production rectifier transformer that can adapt to both thyristor and IGBT rectification. SUMMARY

[0006] The present application provides a hydrogen production rectifier transformer, which solves the problems of high investment cost and large floor area when thyristor rectification and IGBT rectification are used together.

[0007] In a first aspect, the present application provides a hydrogen production rectifier transformer, which includes: a core, a high-voltage winding, a low-voltage winding, a main voltage regulating winding and an auxiliary voltage regulating winding, and an on-load voltage regulating switch connecting the main voltage regulating winding and the high-voltage winding, and a no-field voltage regulating switch connecting the auxiliary voltage regulating winding and the high-voltage winding; when the hydrogen production rectifier transformer is the power supply of a thyristor rectification device, the on-load voltage regulating switch is used to adjust the connection ratio of the main voltage regulating winding to realize variable flux voltage regulation; when the hydrogen production rectifier transformer is the power supply of an IGBT rectification device, the no-field voltage regulating switch is used to adjust the connection ratio of the auxiliary voltage regulating winding to realize constant flux voltage regulation.

[0008] In a possible implementation, the main voltage regulating winding is arranged at the innermost layer outside the core; the high-voltage winding and the auxiliary voltage regulating winding are arranged outside the main voltage regulating winding; and the low-voltage winding is arranged outside the high-voltage winding and the auxiliary voltage regulating winding.

[0009] In one possible implementation, the main voltage regulating winding includes a main voltage regulating winding 1 disposed on the upper innermost layer and a main voltage regulating winding 2 disposed on the lower innermost layer.

[0010] In one possible implementation, the high-voltage winding includes a high-voltage winding 1 and a high-voltage winding 2 arranged vertically; an auxiliary voltage regulating winding 1 is fitted in the middle of the high-voltage winding 1; and an auxiliary voltage regulating winding 2 is fitted in the middle of the high-voltage winding 2.

[0011] In one possible implementation, the low-voltage winding includes a low-voltage winding 1 and a low-voltage winding 2 arranged vertically.

[0012] In one possible implementation, part or all of the main voltage regulating winding 1 is connected to the high voltage winding 1; part or all of the main voltage regulating winding 2 is connected to the high voltage winding 2; the high voltage winding 1 and the high voltage winding 2 are connected to the power grid; the low voltage winding 1 and the low voltage winding 2 supply power to the thyristor rectifier equipment; the hydrogen production rectifier transformer adjusts the connection ratio of the main voltage regulating winding 1 and the main voltage regulating winding 2 through an on-load tap changer to achieve voltage regulation of the low voltage winding 1 and the low voltage winding 2.

[0013] In one possible implementation, part or all of the auxiliary voltage regulating winding 1 is connected to the high-voltage winding 1; part or all of the auxiliary voltage regulating winding 2 is connected to the high-voltage winding 2; the high-voltage winding 1 and the high-voltage winding 2 are connected to the power grid; the low-voltage winding 1 and the low-voltage winding 2 supply power to the IGBT rectifier equipment; the hydrogen production rectifier transformer adjusts the connection ratio of the auxiliary voltage regulating winding 1 and the auxiliary voltage regulating winding 2 through a non-excitation voltage regulating switch to achieve voltage regulation of the high-voltage winding 1 and the high-voltage winding 2.

[0014] In one possible implementation, low-voltage winding 1 is a d-connected winding and low-voltage winding 2 is a y-connected winding; or, low-voltage winding 1 is a y-connected winding and low-voltage winding 2 is a d-connected winding; the phase difference between low-voltage winding 1 and low-voltage winding is 30°; the deviation of the no-load voltage ratio between low-voltage winding 1 and low-voltage winding is less than 1%.

[0015] In one possible implementation, the off-magnetic voltage regulator includes an off-magnetic voltage regulator 1 and an off-magnetic voltage regulator 2, with the off-magnetic voltage regulator 1 connected to the auxiliary voltage regulating winding 1 and the off-magnetic voltage regulator 2 connected to the auxiliary voltage regulating winding 2.

[0016] In one possible implementation, the splitting coefficient of the hydrogen production rectifier transformer... The value range is 3.5 < <4; where the splitting coefficient is the ratio of the splitting impedance to the total through impedance, the splitting impedance is the impedance between low voltage winding 1 and low voltage winding 2, and the total through impedance is the impedance of main voltage regulating winding 1, main voltage regulating winding 2, high voltage winding 1 and high voltage winding 2 relative to low voltage winding 1 and low voltage winding 2.

[0017] The application provides a hydrogen production rectifier transformer, and the application is characterized in that: a main voltage regulating winding and an auxiliary voltage regulating winding are arranged, the main voltage regulating winding and a high-voltage winding are connected through an on-load voltage regulating switch, and the auxiliary voltage regulating winding and the high-voltage winding are connected through a no-field voltage regulating switch; when the hydrogen production rectifier transformer is a power supply of a thyristor rectifier device, the on-load voltage regulating switch is used to adjust the access proportion of the main voltage regulating winding, so as to realize variable flux voltage regulation; when the hydrogen production rectifier transformer is a power supply of an IGBT rectifier device, the no-field voltage regulating switch is used to adjust the access proportion of the auxiliary voltage regulating winding, so as to realize constant flux voltage regulation; the thyristor rectification and the IGBT rectification can be simultaneously adapted, the investment cost can be reduced, the occupied area can be reduced, and the problems of high investment cost and large occupied area when the thyristor rectification and the IGBT rectification are combined are solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0019] Figure 1 is a structure schematic diagram of a hydrogen production rectifier transformer provided by the embodiments of the present application; Figure 2 is a wiring schematic diagram of a hydrogen production rectifier transformer provided by the embodiments of the present application; Figure 3 is a wiring schematic diagram of another hydrogen production rectifier transformer provided by the embodiments of the present application; Figure 4 is a rectification principle schematic diagram of a hydrogen production rectifier transformer provided by the embodiments of the present application. DETAILED DESCRIPTION

[0020] In the following description, specific details are set forth such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application can be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.

[0021] In the description of the present application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a description of the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean that A exists alone, A and B exist together, and B exists alone. In addition, "at least one" means two or more. "First", "second" and the like do not limit the quantity and execution order, and "first", "second" and the like do not necessarily mean different.

[0022] In the embodiments of the present application, the words such as "exemplary" or "for example" are used to mean serving as an example, instance, or illustration. Any embodiment or design presented as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or advantageous than other embodiments or design schemes. In fact, the use of "exemplary" or "for example" is intended to present the relevant concept in a specific manner, so as to facilitate understanding.

[0023] In addition, the terms "include" and "have" and any variation thereof mentioned in the description of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or modules is not limited to the listed steps or modules, but can optionally include other steps or modules not listed, or can optionally include other steps or modules inherent to the process, method, product or device.

[0024] In order to make the purpose, technical scheme and advantages of the present application clearer, specific embodiments will be described below with reference to the drawings of the present application.

[0025] As shown in Figure 1 The hydrogen production rectifier transformer provided by the embodiments of the present application includes: an iron core, a high-voltage winding, a low-voltage winding, a main voltage regulating winding and an auxiliary voltage regulating winding, and an on-load voltage regulating switch connecting the main voltage regulating winding and the high-voltage winding, and a no-field voltage regulating switch connecting the auxiliary voltage regulating winding and the high-voltage winding.

[0026] For example, the iron core of the hydrogen production rectifier transformer adopts a three-phase three-column type or a three-phase five-column type. The main voltage regulating winding 1 and the main voltage regulating winding 2 are located at the innermost side of the iron core; the high-voltage winding 1 and the high-voltage winding 2 are connected in parallel outside the main voltage regulating winding; the low-voltage winding 1 and the low-voltage winding 2 are located outside the high-voltage winding and are connected into d-connection and y-connection respectively, that is, the voltage phase difference is 30°; the auxiliary voltage regulating winding I and the auxiliary voltage regulating winding II are located in the middle of the high-voltage winding.

[0027] When the hydrogen production rectifier transformer is the power supply of the thyristor rectifier device, the on-load voltage regulating switch is used to adjust the connection proportion of the main voltage regulating winding, so as to realize the variable magnetic flux voltage regulation.

[0028] The hydrogen production rectifier transformer is the power supply of the IGBT rectifier device, and the proportion of the auxiliary voltage regulating winding is adjusted through the no-field voltage regulating switch to realize constant magnetic flux voltage regulation.

[0029] In some embodiments, the main voltage regulating winding is arranged on the innermost layer outside the iron core; the high-voltage winding and the auxiliary voltage regulating winding are arranged outside the main voltage regulating winding; and the low-voltage winding is arranged outside the high-voltage winding and the auxiliary voltage regulating winding.

[0030] In some embodiments, the main voltage regulating winding includes a main voltage regulating winding 1 arranged on the upper side of the innermost layer and a main voltage regulating winding 2 arranged on the lower side of the innermost layer.

[0031] In some embodiments, the high-voltage winding includes a high-voltage winding 1 and a high-voltage winding 2 arranged in an upper-lower manner; the auxiliary voltage regulating winding 1 is sleeved on the middle part of the high-voltage winding 1; and the auxiliary voltage regulating winding 2 is sleeved on the middle part of the high-voltage winding 2.

[0032] In some embodiments, the low-voltage winding includes a low-voltage winding 1 and a low-voltage winding 2 arranged in an upper-lower manner.

[0033] The main voltage regulating winding is located on the innermost side, is lined with a hard paper tube, is sleeved on the iron core, and includes a main voltage regulating winding 1 on the upper part and a main voltage regulating winding 2 on the lower part, which are connected with the high-voltage winding respectively. The main voltage regulating winding is a multi-stage series winding, and is connected with the on-load voltage regulating switch through a tapping lead.

[0034] The high-voltage winding is sleeved outside the main voltage regulating winding, includes a high-voltage winding 1 on the upper part and a high-voltage winding 2 on the lower part, which are connected with the main voltage regulating winding and the auxiliary voltage regulating winding respectively. The low-voltage winding is sleeved outside the high-voltage winding, includes a low-voltage winding 1 on the upper part and a low-voltage winding 2 on the lower part, which are connected with the load rectifier device respectively. The auxiliary voltage regulating winding is sleeved on the middle part of the high-voltage winding, includes an auxiliary voltage regulating winding 1 on the upper part and an auxiliary voltage regulating winding 2 on the lower part, which are connected with the high-voltage winding respectively. The auxiliary voltage regulating winding is a multi-stage cross connection voltage regulating, and is connected with the no-field voltage regulating switch through a tapping lead.

[0035] In some embodiments, part or all of the main voltage regulating winding 1 is connected with the high-voltage winding 1; part or all of the main voltage regulating winding 2 is connected with the high-voltage winding 2; the high-voltage winding 1 and the high-voltage winding 2 are connected with the power grid; the low-voltage winding 1 and the low-voltage winding 2 are used for supplying power to the thyristor rectifier device; and the hydrogen production rectifier transformer adjusts the proportion of the main voltage regulating winding 1 and the main voltage regulating winding 2 through the on-load voltage regulating switch to realize voltage regulation of the low-voltage winding 1 and the low-voltage winding 2.

[0036] In some embodiments, the main regulating winding is partially or entirely connected to the high-voltage winding, and the high-voltage winding is connected to the power grid. In this case, the outputs of the two low-voltage windings with a mutual difference of 30° can be used as the power supply for the thyristor rectifier device. The hydrogen production transformer can adjust the voltage of the low-voltage winding by adjusting the number of turns of the main regulating winding, which belongs to variable magnetic flux voltage regulation. This mode of operation is referred to as "full penetration operation", and the impedance of the high-voltage winding and the main regulating winding to the low-voltage winding is referred to as "full penetration impedance". When the other windings are all open, the impedance between the two low-voltage windings is referred to as "split impedance", and the ratio of the "split impedance" to the "full penetration impedance" is referred to as the "split coefficient

[0037] In some embodiments, part or all of the auxiliary regulating winding 1 is connected to the high-voltage winding 1, and part or all of the auxiliary regulating winding 2 is connected to the high-voltage winding 2. The high-voltage winding 1 and the high-voltage winding 2 are connected to the power grid, and the low-voltage winding 1 and the low-voltage winding 2 supply power to the IGBT rectifier device. The hydrogen production rectifier transformer adjusts the proportion of the auxiliary regulating winding 1 and the auxiliary regulating winding 2 connected by the no-load voltage regulating switch to achieve voltage regulation of the high-voltage winding 1 and the high-voltage winding 2.

[0038] The auxiliary regulating winding is partially or entirely connected to the high-voltage winding, and the high-voltage winding is connected to the power grid. At the same time, the main regulating winding is not connected to the high-voltage winding. In this case, the outputs of the two low-voltage windings with a mutual difference of 30° can be used as the power supply for the IGBT rectifier device. The hydrogen production transformer can adjust the voltage fluctuation of the high-voltage winding by adjusting the number of turns of the auxiliary regulating winding, which belongs to constant magnetic flux voltage regulation. For example, when one set of low-voltage windings is open, only one set of low-voltage windings is connected to the rectifier device. This mode of operation is referred to as "half penetration operation", and the impedance of the high-voltage winding and the auxiliary regulating winding to the low-voltage winding is referred to as "half penetration impedance".

[0039] For example, as shown in Figure 2 The auxiliary regulating winding 1 is connected to the high-voltage winding 1 at a position of 70-80% of the total number of turns of the high-voltage winding 1 from the first end, and the auxiliary regulating winding 2 is connected to the high-voltage winding 2 at a position of 70-80% of the total number of turns of the high-voltage winding 2 from the first end. The auxiliary regulating winding 1 and the auxiliary regulating winding 2 are connected to the no-load voltage regulating switch 10 through a tapping lead. ​The main voltage regulating winding 1 and the main voltage regulating winding 2 are connected with the high-voltage winding 1 and the high-voltage winding 2, the high-voltage winding 1 and the high-voltage winding 2 are connected with the power grid, and the output of the low-voltage winding 1 and the low-voltage winding 2 with a mutual difference of 30° can be used as the power supply of the thyristor rectifier device. At this time, the hydrogen production transformer can adjust the voltage of the low-voltage winding 1 and the low-voltage winding 2 by adjusting the number of turns of the main voltage regulating winding 1 and the main voltage regulating winding 2, which belongs to variable magnetic flux voltage regulation. This operation mode is also called "full penetration operation", and the impedance of the high-voltage winding 1 and the high-voltage winding 2 to the low-voltage winding 1 and the low-voltage winding 2 is called "full penetration impedance". When all other windings are open, the impedance between the low-voltage winding 1 and the low-voltage winding 2 is called "split impedance", and the ratio of the "split impedance" to the "full penetration impedance" is called "split coefficient".

[0040] The auxiliary voltage regulating winding 1 and the auxiliary voltage regulating winding 2 are connected with the high-voltage winding 1 and the high-voltage winding 2, the high-voltage winding 1 and the high-voltage winding 2 are connected with the power grid, and the main voltage regulating winding 1 and the main voltage regulating winding 2 are not connected with the high-voltage winding 1 and the high-voltage winding 2, and the output of the low-voltage winding 1 and the low-voltage winding 2 with a mutual difference of 30° can be used as the power supply of the IGBT rectifier device. At this time, the hydrogen production transformer can adjust the voltage fluctuation of the high-voltage winding 1 and the high-voltage winding 2 by adjusting the number of turns of the auxiliary voltage regulating winding 1 and the auxiliary voltage regulating winding 2, which belongs to constant magnetic flux voltage regulation. For example, the low-voltage winding 1 is disconnected, only the low-voltage winding 2 is connected with the rectifier device, or the low-voltage winding 2 is disconnected, only the low-voltage winding 1 is connected with the rectifier device. This operation mode is also called "half penetration operation", and the impedance of the high-voltage winding 1 and the high-voltage winding 2 to the low-voltage winding 1 or the low-voltage winding 2 is called "half penetration impedance".

[0041] When the operation mode is "half penetration operation", the auxiliary voltage regulating winding 1 and the auxiliary voltage regulating winding 2 are connected with the high-voltage winding 1 and the high-voltage winding 2, the low-voltage winding 1 is short-circuited, and only one group of low-voltage winding is connected, so that the upper and lower parts of the magnetic circuit are asymmetric. If the auxiliary voltage regulating winding 1 and the auxiliary voltage regulating winding 2 are connected in parallel and then connected to the no-excitation switch 10, the loop between the two will have circulating current due to the inconsistent coupling degree between each branch and the low-voltage winding 1. Through electromagnetic simulation, it can be found that the circulating current cannot be ignored.

[0042] If the auxiliary voltage regulating winding 1 and the auxiliary voltage regulating winding 2 are connected in parallel and then connected to a no-excitation switch, there will be circulating current between the two auxiliary windings. In the present application, the leads of the two auxiliary windings are connected to different switches, which can effectively avoid the circulating current.

[0043] For example, the auxiliary voltage regulating winding 1 and the auxiliary voltage regulating winding 2 are connected in parallel and then connected to a no-excitation switch, and the low-voltage winding 1 is short-circuited. Figure 3As shown, by connecting the leads of auxiliary voltage regulating winding 1 and auxiliary voltage regulating winding 2 to different non-excitation voltage regulating switches 1 and 2 respectively, the circulation path of the circulating current can be effectively cut off, thus avoiding this circulating current.

[0044] like Figure 4 As shown, in the "full-through operation" mode, the voltage difference between low-voltage winding 1 and low-voltage winding 2 is 30°. Although the average DC voltage output by the two rectifier bridges is equal, the instantaneous values ​​are different, resulting in an instantaneous voltage difference between the two rectifier bridges. Due to this instantaneous voltage difference, a circulating current will be generated in the large loop between the two split low-voltage windings and the rectifier. Properly setting the "split impedance" value can limit this circulating current to a reasonable range.

[0045] When the operating mode is "full-through operation," the circulating current flows between the thyristors of the two rectifier bridges that are conducting and the secondary winding of the transformer. The direction of the circulating current changes as the rectifier components commutate. Therefore, the frequency of the circulating current is six times the power supply voltage frequency.

[0046] According to the commutation rule, assuming that starting from b1c1, the conduction sequence of the line voltage is as follows: b1c1→b2c2→b1a1→b2a2→c1a1→c2a2→c1b1→c2b2→a1b1→a2b2→a1c1→a2c2→b1c1.

[0047] Instantaneous value of cyclic voltage: = ; When represented as an equivalent sine wave, the root mean square effective value of the cyclic voltage is approximately: =0.11 ; in: This is the effective value of the secondary voltage.

[0048] When the circulating current exceeds the operating current, it will flow within the circulating path. The circulating current path includes the split impedance of two 6-pulse low-voltage windings. This is because the frequency of the circulating current is six times the power supply voltage frequency.

[0049] That is: ; Assume the transformer's primary winding is connected in a D-shape with n turns, and the secondary winding is connected in a y-shape with n turns. Turns, secondary winding d, number of turns n turns.

[0050] The percentage of circulating current referred to the primary side: ; in: It is the circulating current; For split impedance; is a split impedance unit value; is a primary line current effective value.

[0051] The proportion of the circulating current converted to the DC side is: ; Wherein: is a load current.

[0052] In order to reduce the circulating current, the split factor of the hydrogen production rectifier transformer is controlled in 3.5 < 4, so that when the "half-crossing impedance " is 7%, the "full-crossing impedance " is about 7.5%, and the split impedance is about 24% < 30%, and the circulating current is about 4.2% ~ 5.2%, so the circulating current proportion is controlled in a small range, and the balance reactor does not need to be increased when the two rectifier bridges operate in parallel.

[0053] Due to structural reasons, the half-crossing impedance of the secondary side y connection winding and the d connection winding to the primary side winding is not equal, which will cause the outlet voltage to be not equal in the case of load operation, and will increase the circulating current. In order to limit the circulating current, the reactance height of the y connection winding and the d connection winding should be consistent, and when the outlet is adopted on the transformer tank cover, the y connection winding is arranged on the upper part of the d connection winding in the axial direction.

[0054] In actual application, the number of turns of the d connection winding and the y connection winding is not strictly equal to times relationship, which will also affect the circulating current, and when the number of turns is designed, the deviation of the no-load voltage ratio should be controlled to be less than 1%.

[0055] In some embodiments, the low-voltage winding 1 is a d connection winding, and the low-voltage winding 2 is a y connection winding; or, the low-voltage winding 1 is a y connection winding, and the low-voltage winding 2 is a d connection winding; the phase difference between the low-voltage winding 1 and the low-voltage winding is 30°; and the deviation of the no-load voltage ratio of the low-voltage winding 1 and the low-voltage winding is less than 1%.

[0056] In some embodiments, the field-free voltage regulating switch includes a field-free voltage regulating switch 1 and a field-free voltage regulating switch 2, the field-free voltage regulating switch 1 is connected with the auxiliary voltage regulating winding 1, and the field-free voltage regulating switch 2 is connected with the auxiliary voltage regulating winding 2.

[0057] In some embodiments, the split factor of the hydrogen production rectifier transformer is in the range of 3.5 < 4; wherein the split factor is the ratio of the split impedance to the full-crossing impedance, the split impedance is the impedance between the low-voltage winding 1 and the low-voltage winding 2, and the full-crossing impedance is the impedance of the main voltage regulating winding 1, the main voltage regulating winding 2, the high-voltage winding 1 and the high-voltage winding 2 relative to the low-voltage winding 1 and the low-voltage winding 2.

[0058] This invention provides a hydrogen production rectifier transformer. By setting up a main voltage regulating winding and an auxiliary voltage regulating winding, the main voltage regulating winding and the high-voltage winding are connected via an on-load tap changer, and the auxiliary voltage regulating winding and the high-voltage winding are connected via an off-load tap changer. When the hydrogen production rectifier transformer powers a thyristor rectifier device, the connection ratio of the main voltage regulating winding is adjusted via the on-load tap changer to achieve variable flux voltage regulation. When the hydrogen production rectifier transformer powers an IGBT rectifier device, the connection ratio of the auxiliary voltage regulating winding is adjusted via the off-load tap changer to achieve constant flux voltage regulation. This allows for simultaneous adaptation of thyristor rectification and IGBT rectification, reducing investment costs and floor space, thus solving the problems of high investment costs and large floor space required when using thyristor rectification and IGBT rectification in combination.

[0059] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A hydrogen production rectifier transformer, characterized in that, include: Iron core, high voltage winding, low voltage winding, main voltage regulating winding and auxiliary voltage regulating winding, as well as on-load tap changer connecting the main voltage regulating winding and the high voltage winding, and off-load tap changer connecting the auxiliary voltage regulating winding and the high voltage winding; When the hydrogen production rectifier transformer is used as the power supply for the thyristor rectifier equipment, the connection ratio of the main voltage regulating winding is adjusted by the on-load tap changer to achieve variable flux voltage regulation. When the hydrogen production rectifier transformer is used as the power supply for the IGBT rectifier equipment, the connection ratio of the auxiliary voltage regulating winding is adjusted by the non-excitation voltage regulating switch to achieve constant flux voltage regulation.

2. The hydrogen production rectifier transformer according to claim 1, characterized in that, The main voltage regulating winding is located on the innermost layer outside the iron core; the high-voltage winding and the auxiliary voltage regulating winding are located outside the main voltage regulating winding; the low-voltage winding is located outside the high-voltage winding and the auxiliary voltage regulating winding.

3. The hydrogen production rectifier transformer according to claim 1, characterized in that, The main voltage regulating winding includes a main voltage regulating winding 1 located on the upper innermost layer and a main voltage regulating winding 2 located on the lower innermost layer.

4. The hydrogen production rectifier transformer according to claim 1, characterized in that, The high-voltage winding includes a high-voltage winding 1 and a high-voltage winding 2 arranged vertically. An auxiliary voltage regulating winding 1 is installed in the middle of the high voltage winding 1; An auxiliary voltage regulating winding 2 is installed in the middle of the high voltage winding 2.

5. The hydrogen production rectifier transformer according to claim 1, characterized in that, The low-voltage winding includes a low-voltage winding 1 and a low-voltage winding 2 arranged vertically.

6. The hydrogen production rectifier transformer according to claim 1, characterized in that, Part or all of the main voltage regulating winding 1 is connected to the high voltage winding 1; part or all of the main voltage regulating winding 2 is connected to the high voltage winding 2; the high voltage winding 1 and the high voltage winding 2 are connected to the power grid; the low voltage winding 1 and the low voltage winding 2 supply power to the thyristor rectifier equipment. The hydrogen production rectifier transformer adjusts the connection ratio of the main voltage regulating winding 1 and the main voltage regulating winding 2 through the on-load tap changer to achieve voltage regulation of the low-voltage winding 1 and the low-voltage winding 2.

7. The hydrogen production rectifier transformer according to claim 1, characterized in that, Part or all of the auxiliary voltage regulating winding 1 is connected to the high voltage winding 1; part or all of the auxiliary voltage regulating winding 2 is connected to the high voltage winding 2; the high voltage winding 1 and the high voltage winding 2 are connected to the power grid; the low voltage winding 1 and the low voltage winding 2 supply power to the IGBT rectifier equipment. The hydrogen production rectifier transformer adjusts the connection ratio of auxiliary voltage regulating winding 1 and auxiliary voltage regulating winding 2 through the non-excitation voltage regulating switch to achieve voltage regulation of high voltage winding 1 and high voltage winding 2.

8. The hydrogen production rectifier transformer according to claim 1, characterized in that, The low-voltage winding 1 is a d-connected winding, and the low-voltage winding 2 is a y-connected winding; or, the low-voltage winding 1 is a y-connected winding, and the low-voltage winding 2 is a d-connected winding; the phase difference between the low-voltage winding 1 and the low-voltage winding is 30°. The deviation between the no-load voltage ratio of the low-voltage winding 1 and the low-voltage winding is less than 1%.

9. The hydrogen production rectifier transformer according to claim 1, characterized in that, The off-magnetic voltage regulating switch includes an off-magnetic voltage regulating switch 1 and an off-magnetic voltage regulating switch 2. The off-magnetic voltage regulating switch 1 is connected to the auxiliary voltage regulating winding 1, and the off-magnetic voltage regulating switch 2 is connected to the auxiliary voltage regulating winding 2.

10. The hydrogen production rectifier transformer according to claim 1, characterized in that, The splitting coefficient of the hydrogen production rectifier transformer The value range is 3.5 < <4; Wherein, the splitting coefficient is the ratio of the splitting impedance to the total through impedance, the splitting impedance is the impedance between low-voltage winding 1 and low-voltage winding 2, and the total through impedance is the impedance of main voltage regulating winding 1, main voltage regulating winding 2, high-voltage winding 1 and high-voltage winding 2 relative to low-voltage winding 1 and low-voltage winding 2.

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