A compact three-dimensional magnetic control transformer

Abstract

The application discloses a compact three-dimensional magnetic control transformer, comprising three identical single-frame iron cores which are spliced to form a three-prism three-dimensional structure; wherein each single-frame iron core comprises iron core columns arranged on left and right sides and transverse chokes arranged on upper and lower ends; a magnetic valve is arranged at the middle position of each transverse choke, a side choke connected with the transverse choke is arranged above the magnetic valve, the cross-sectional area of the magnetic valve is equal to that of the side choke, and the protrusions of the magnetic valve and the side choke correspond in position; direct-current windings are wound on the side chokes; and three-phase alternating-current windings are wound on the iron core columns of two adjacent single-frame iron cores. The magnetic control transformer provided by the application can stably output reactive power, greatly reduces the occupied space of the transformer equipment, is especially suitable for urban power distribution stations with limited space, and can be widely applied to actual power grid engineering.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and in particular to a compact three-dimensional magnetically controlled transformer. Background Art

[0002] At present, a large number of cables are used for power supply in urban power grid construction, which increases the capacitive reactive charging power in the power system. When the load is light, there is excessive redundant capacitive reactive power. At this time, inductive reactive power compensation equipment is urgently needed to compensate for the capacitive reactive power.

[0003] Traditional reactive power compensation solutions typically employ active compensation devices based on power electronics or external controllable reactors (such as thyristor-controlled reactors and magnetic-controlled reactors). However, common issues with power electronics include low reliability, inability to operate in harsh environments, high maintenance costs, and electromagnetic interference generated by high-frequency switching, which can impact the city's electromagnetic environment. Alternatively, external controllable reactors require additional floor space, making them unsuitable for the limited space of urban distribution stations.

[0004] The magnetically controlled transformer combines a controllable reactor with a transformer, allowing traditional transformers to have the basic function of stepping up and down voltage as well as the ability to flexibly adjust reactive voltage. It only requires adding some floor space to the original transformer volume, making it particularly suitable for urban distribution stations with limited space.

[0005] However, the magnetic control transformers in the prior art are all single-phase magnetic control transformer topology structures. If three single-phase magnetic control transformers are used, the occupied area is large and it is not suitable for urban distribution networks with limited space. There is no three-phase magnetic control transformer in the prior art that can be applied to the existing power system. Summary of the Invention

[0006] The object of the present invention is to provide a compact three-dimensional magnetic control transformer to solve the technical problem that the existing magnetic control transformer occupies a large area and is not suitable for urban power distribution networks with limited space.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] A compact three-dimensional magnetic control transformer, comprising:

[0009] Three identical single-frame iron cores, wherein the three single-frame iron cores are spliced ​​to form a triangular pyramid three-dimensional structure;

[0010] Each of the single-frame iron cores includes iron core columns arranged on the left and right sides, and cross struts arranged on the upper and lower ends respectively;

[0011] A magnetic valve is provided in the middle of each transverse yoke, and a side yoke connected to the transverse yoke is provided above the magnetic valve. The cross-sectional area of ​​the magnetic valve and the side yoke are equal, and the protrusions of the magnetic valve and the side yoke correspond in position.

[0012] The DC winding is wound on each of the side chokes respectively; the three-phase AC winding is wound on the core columns of two adjacent single-frame iron cores respectively.

[0013] Optionally, the cross-sectional area of ​​the magnetic valve is half of the cross-sectional area at both ends of the cross-sectional area.

[0014] Optionally, the bypass choke is an inverted U-shaped bypass choke.

[0015] Optionally, the bypass choke is an arc-shaped bypass choke.

[0016] Optionally, the three single-frame cores are symmetrically distributed in the form of a triangular pyramid in space.

[0017] Optionally, two adjacent core columns in two adjacent single-frame cores form a group of core columns, and three groups of core columns are symmetrically distributed in the form of triangular pyramids in space.

[0018] Optionally, the two DC windings of each single-frame iron core generate two DC magnetic fluxes with the same direction at the corresponding magnetic valve.

[0019] Optionally, the AC magnetic flux flowing through each of the single-frame iron cores has the same direction as one of the two DC magnetic fluxes, and the AC magnetic flux and the DC magnetic flux with the same direction are superimposed on each other, so that the magnetic valve is saturated.

[0020] Optionally, the AC magnetic flux flowing through each of the single-frame iron cores is in a direction opposite to one of the two DC magnetic fluxes, and the DC magnetic flux partially offsets the AC magnetic flux, so that the magnetic valve is not saturated.

[0021] The present invention provides a compact three-dimensional magnetically controlled transformer, comprising: three identical single-frame iron cores, which are spliced ​​together to form a triangular pyramid three-dimensional structure; wherein each of the single-frame iron cores includes iron core columns respectively arranged on the left and right sides, and cross chokes respectively arranged on the upper and lower ends; a magnetic valve is provided in the middle position of each cross choke, and a side choke connected to the cross choke is provided above the magnetic valve, the cross-sectional area of ​​the magnetic valve and the side choke is equal, and the protrusions of the magnetic valve and the side choke correspond in position; a DC winding is respectively wound on each of the side chokes; and a three-phase AC winding is respectively wound on the iron core columns of two adjacent single-frame iron cores.

[0022] Based on the above technical solution, the beneficial effects brought about by the present invention are:

[0023] Three identical single-frame cores are spliced ​​together to form a triangular pyramid three-dimensional structure. Each single-frame core includes two upper and lower cross chokes and two left and right core columns. A magnetic valve is provided in the middle of each cross choke, and a side choke connected to the cross choke is provided above the magnetic valve. DC windings are wound on each side choke, and three-phase AC windings are wound on the core columns of two adjacent single-frame cores. During normal operation, the two DC windings of any single-frame core will generate two DC magnetic fluxes with the same direction at the corresponding small magnetic valves. The AC magnetic flux will be superimposed on the DC magnetic flux at a certain magnetic valve to saturate the magnetic valve, thereby stably outputting reactive power. In addition to the basic function of step-up and step-down of traditional transformers, it also has the ability to flexibly adjust the reactive voltage. Only a part of the floor space needs to be increased on the original transformer volume, which is particularly suitable for urban distribution stations with limited space.

[0024] The magnetic control transformer provided by the present invention is a compact, three-dimensional, multifunctional magnetic control transformer. Compared with the single-phase magnetic control transformer using three three-column type, it can save the floor space and volume of three core columns, greatly reducing the floor space and volume of existing equipment, and reducing the space occupied by the equipment, thereby providing a more flexible deployment method for transformer equipment, improving the design freedom of urban distribution station buildings, providing more flexible and reliable power transformer equipment for industrial production, and can be widely used in actual power grid projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the topological structure of an embodiment of the present invention;

[0026] Figure 2 Schematic diagram of the topology of a single-frame core in an embodiment of the present invention;

[0027] Figure 3 is a schematic diagram of an AC winding in an embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of a DC winding in an embodiment of the present invention;

[0029] Figure 5 Schematic diagram of magnetic circuit analysis of a magnetron transformer at a certain moment in an embodiment of the present invention;

[0030] Figure 6 Schematic diagram of average magnetic flux of three phases ABC in an embodiment of the present invention;

[0031] Among them, 1 represents a single-frame iron core, 2 represents a magnetic valve, 3 represents a bypass choke, 4 represents a phase AC winding, and 5 represents a DC winding. DETAILED DESCRIPTION

[0032] The embodiment of the present invention provides a compact three-dimensional magnetic control transformer to solve the technical problem that the existing magnetic control transformer occupies a large area and is not suitable for urban power distribution networks with limited space.

[0033] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive disclosure of the present invention.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Existing magnetic control transformers all use a single-phase magnetic control transformer topology. Using three single-phase magnetic control transformers would require a large footprint, making them unsuitable for urban power distribution networks, where space is limited. Existing technology lacks a three-phase magnetic control transformer topology suitable for existing power systems.

[0036] See also Figures 1 to 5 The present invention provides an embodiment of a compact three-dimensional magnetic control transformer, comprising:

[0037] Three identical single-frame iron cores, wherein the three single-frame iron cores are spliced ​​to form a triangular pyramid three-dimensional structure;

[0038] Each of the single-frame iron cores includes iron core columns arranged on the left and right sides, and cross struts arranged on the upper and lower ends respectively;

[0039] A magnetic valve is provided in the middle of each transverse yoke, and a side yoke connected to the transverse yoke is provided above the magnetic valve. The cross-sectional area of ​​the magnetic valve and the side yoke are equal, and the protrusions of the magnetic valve and the side yoke correspond in position.

[0040] The DC winding is wound on each of the side chokes respectively; the three-phase AC winding is wound on the core columns of two adjacent single-frame iron cores respectively.

[0041] In the embodiment of the present invention, three single-frame cores are spliced ​​together to form a triangular pyramid structure, resulting in a compact and multifunctional magnetic control transformer. This triangular pyramid structure saves space and volume compared to three single-phase magnetic control transformers with three cores.

[0042] In one embodiment, a magnetic control transformer includes three identical single-frame cores. Each single-frame core includes left and right core legs and upper and lower cross struts. Specifically, each single-frame core includes two core legs and two cross struts, resulting in a total of six core legs across the three single-frame cores. The three single-frame cores are spliced ​​together to form a triangular pyramid structure, ie, the three single-frame cores are symmetrically distributed in space like a triangular pyramid.

[0043] Specifically, there are four core columns in two adjacent single-frame cores, where two adjacent core columns form a group of core columns, and the three groups of core columns are symmetrically distributed in the shape of a triangular pyramid in space. Assume that the two adjacent single-frame cores are the first single-frame core K and the second single-frame core M, and the two adjacent core columns of K and M form a group (a pair) of core columns, that is, the core column to the right of K and the core column to the left of M form a pair of core columns. In a similar way, the six core columns of the three single-frame cores can be divided into three pairs of core columns, and the three pairs of core columns are symmetrically distributed in the shape of a triangular pyramid in space.

[0044] It can be understood that the three single-frame cores are spliced ​​together to form a six-column three-dimensional structure. The two adjacent core columns of two adjacent single-frame cores form a pair of core columns, and each pair of core columns is symmetrically distributed in a triangular pyramid in space.

[0045] In one embodiment, a magnetic valve is positioned midway between each transverse yoke, and a side yoke connected to the transverse yoke is positioned above the magnetic valve. The cross-sectional area of ​​the magnetic valve and the side yoke are equal, and the magnetic valve and the protrusion of the side yoke correspond in position. In a preferred embodiment, the side yoke is an inverted U-shaped side yoke or an arc-shaped side yoke.

[0046] It should be noted that the purpose of providing an inverted U-shaped bypass choke is to wind the DC excitation winding and it can also be an arc or other shape. For the embodiments of the present invention, the shape of the bypass choke does not affect the technical problem it solves. In the embodiments of the present invention, there is no requirement for the relative distance between the magnetic valve and the bypass choke (such as the inverted U-shaped bypass choke), but the position of the magnetic valve and the raised portion of the bypass choke must correspond.

[0047] Each single-frame core has two upper and lower crosspieces, each with a magnetic valve located in the middle. In a preferred embodiment, the cross-sectional area of ​​the magnetic valve is half that of the crosspiece at either end. A side choke connected to the crosspiece is located above the magnetic valve. The cross-sectional area of ​​the magnetic valve is equal to that of the side choke, and the protrusions of the magnetic valve and the side choke correspond. In a preferred embodiment, the cross-sectional area of ​​the side choke is half that of the crosspiece at either end.

[0048] In one embodiment, the DC windings are wound on each shunt choke, and the three-phase AC windings are wound on the core legs of two adjacent single-frame cores. Each single-frame core has two transverse chokes, each of which is equipped with a shunt choke. Thus, each single-frame core is equipped with two shunt chokes, and each single-frame core is wound with two DC excitation windings.

[0049] In one embodiment, the three-phase AC windings are respectively wound on the core columns of two adjacent single-frame iron cores. Each phase of the three-phase AC winding is respectively wound on the core columns spliced ​​together by two adjacent iron core frames, and the six core columns are divided into three pairs of core columns, and these three pairs of core columns are also symmetrically distributed in the form of a triangular pyramid in space. For example, the three-phase AC windings are phase A, phase B, and phase C. The A-phase AC winding is wound on the two adjacent core columns of the first and second single-frame iron cores (the right core column of the first single-frame iron core and the left core column of the second single-frame iron core), the B-phase AC winding is wound on the two adjacent core columns of the second and third single-frame iron cores (the right core column of the second single-frame iron core and the left core column of the third single-frame iron core), and the C-phase AC winding is wound on the two adjacent core columns of the third and first single-frame iron cores (the right core column of the third single-frame iron core and the left core column of the first single-frame iron core).

[0050] An embodiment of the present invention provides a compact three-dimensional magnetically controlled transformer. When the magnetically controlled transformer is operating normally, the two DC windings of any single-frame iron core will generate two DC magnetic fluxes with the same direction at the corresponding small magnetic valves. The AC magnetic flux will be superimposed on the DC magnetic flux at a certain magnetic valve to saturate the magnetic valve, thereby outputting reactive power; while at the other magnetic valve, the DC magnetic flux offsets part of the AC magnetic flux, and the magnetic valve is not saturated.

[0051] In one embodiment, the two DC windings of each single-frame core generate two DC magnetic fluxes with the same direction at the corresponding magnetic valves. For each single-frame core, a magnetic valve is positioned midway between the upper and lower transverse yokes. Above each magnetic valve is an inverted U-shaped yoke, on which the DC windings are wound. This means that each single-frame core has two DC windings wound around it. These two DC windings generate two DC magnetic fluxes of equal magnitude and direction at the corresponding positions of the magnetic valves.

[0052] In one embodiment, the AC magnetic flux flowing through each single-frame iron core has the same direction as one of the two DC magnetic fluxes. The AC magnetic flux and the DC magnetic flux with the same direction are superimposed on each other, causing the magnetic valve to saturate.

[0053] In one embodiment, the AC magnetic flux flowing through each single-frame iron core is in the opposite direction to one of the two DC magnetic fluxes, and the DC magnetic flux offsets part of the AC magnetic flux, so that the magnetic valve is not saturated.

[0054] Specifically, the magnetic fluxes flowing through the three single-frame core columns of the compact three-dimensional magnetic control transformer are ΦAB, ΦBC and ΦCA respectively, the average magnetic fluxes of the two single-frame core columns wrapped by the A-phase, B-phase and C-phase windings are ΦA, ΦB and ΦC respectively, the DC magnetic flux is ΦD, the currents flowing through the A-phase, B-phase and C-phase windings are IA, IB and IC respectively, and the DC current in the DC excitation winding is ID.

[0055] Now take a certain time period where ΦA>ΦB and ΦA>ΦC for analysis. In this time period, the actual flow direction of all magnetic fluxes related to phase A is as follows: Figure 5 As shown in the figure, the four DC magnetic fluxes all flow counterclockwise, with ΦAB flowing counterclockwise and ΦCA flowing clockwise. It can be seen that during this time period: ΦAB and ΦD flow in the same direction at the lower left magnetic valve, superimposing each other and causing the magnetic valve to saturate. ΦCA and ΦD flow in the same direction at the upper right magnetic valve, superimposing each other and causing the magnetic valve to saturate. Therefore, for phase A, during this time period, the magnetic flux it generates flows through two saturated magnetic valves, one on each side, creating a symmetrical magnetic circuit.

[0056] It should be noted that each single-frame iron core has two DC fluxes, and a compact three-dimensional magnetic control transformer has a total of six DC fluxes. Only the A-phase AC winding is analyzed here, and the A-phase is only related to the two single-frame iron cores and the four DC fluxes on these two single-frame iron cores.

[0057] Please note that Figure 6 In addition to the case where ΦA > ΦB and ΦA > ΦC, there are also two possible cases: ΦB > ΦA and ΦB > ΦC, and ΦC > ΦA and ΦC > ΦB. Since the three phases are symmetrical and the operating principles of each phase are the same, there is no essential difference between these three cases.

[0058] In one embodiment, at any time, the AC magnetic flux generated by any phase AC winding will flow through two saturated magnetic valves, and the two magnetic valves are symmetrical.

[0059] From the above analysis, it can be seen that the magnetic flux generated by any phase at any time will flow through two saturated magnetic valves, one on each side, and the magnetic circuit is symmetrical. Therefore, the compact three-dimensional magnetic control transformer provided by the embodiment of the present invention can stably output reactive power.

[0060] The compact three-dimensional magnetically controlled transformer provided by the embodiment of the present invention splices three identical single-frame cores to form a triangular pyramid three-dimensional structure. Each single-frame core includes two upper and lower cross-chains and two left and right core columns. A magnetic valve is provided in the middle position of each cross-chain, and a side chain connected to the cross-chain is provided above the magnetic valve. The DC windings are respectively wound on each side chain, and the three-phase AC windings are respectively wound on the core columns of the two adjacent single-frame cores. During normal operation, the two DC windings of any single-frame core will generate two DC magnetic fluxes with the same direction at the corresponding small magnetic valves. The AC magnetic flux will be superimposed on the DC magnetic flux at a certain magnetic valve to saturate the magnetic valve, thereby stably outputting reactive power. In addition to the basic function of stepping up and down the voltage of a traditional transformer, it also has the ability to flexibly adjust the reactive voltage. Only a part of the floor space needs to be increased on the original transformer volume. It is particularly suitable for urban distribution stations with limited space.

[0061] The magnetically controlled transformer provided in the embodiment of the present invention is a compact, three-dimensional, multifunctional magnetically controlled transformer. Compared with the single-phase magnetically controlled transformer using three three-column units, it can save the floor space and volume of three core columns, greatly reducing the floor space and volume of existing equipment, and reducing the space occupied by the equipment, thereby providing a more flexible deployment method for transformer equipment, improving the design freedom of urban distribution station buildings, and providing more flexible and reliable power transformer equipment for industrial production. It can be widely used in actual power grid projects.

[0062] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0063] In the embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0064] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0065] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0066] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, and other media that can store program code.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A compact three-dimensional magnetic control transformer, characterized in that: include: Three identical single-frame iron cores, wherein the three single-frame iron cores are spliced ​​to form a triangular pyramid three-dimensional structure; Each of the single-frame iron cores includes iron core columns arranged on the left and right sides, and cross struts arranged on the upper and lower ends respectively; A magnetic valve is provided in the middle of each transverse yoke, and a side yoke connected to the transverse yoke is provided above the magnetic valve. The cross-sectional area of ​​the magnetic valve and the side yoke are equal, and the protrusions of the magnetic valve and the side yoke correspond in position. The DC winding is wound on each of the side chokes respectively; the three-phase AC winding is wound on the core columns of the two adjacent single-frame iron cores respectively; The two DC windings of each single-frame iron core generate two DC magnetic fluxes with the same direction at the corresponding magnetic valve; At any time, the AC magnetic flux generated by any phase AC winding will flow through two saturated magnetic valves, and the two magnetic valves are symmetrical.

2. The compact three-dimensional magnetic control transformer according to claim 1, characterized in that: The cross-sectional area of ​​the magnetic valve is half of the cross-sectional area at both ends of the cross-sectional area.

3. The compact three-dimensional magnetic control transformer according to claim 1, characterized in that: The side choke is an inverted U-shaped side choke.

4. The compact three-dimensional magnetic control transformer according to claim 1, characterized in that: The side choke is an arc-shaped side choke.

5. The compact three-dimensional magnetic control transformer according to claim 1, characterized in that: The three single-frame iron cores are symmetrically distributed in a triangular pyramid shape in space.

6. The compact three-dimensional magnetic control transformer according to claim 5, characterized in that: Two adjacent core columns in two adjacent single-frame cores form a group of core columns, and three groups of core columns are symmetrically distributed in a triangular pyramid shape in space.

7. The compact three-dimensional magnetic control transformer according to claim 1, characterized in that: The AC magnetic flux flowing through each of the single-frame iron cores has the same direction as one of the two DC magnetic fluxes. The AC magnetic flux and the DC magnetic flux with the same direction are superimposed on each other, so that the magnetic valve is saturated.

8. The compact three-dimensional magnetic control transformer according to claim 1, characterized in that: The AC magnetic flux flowing through each of the single-frame iron cores is in the opposite direction to one of the two DC magnetic fluxes. The DC magnetic flux offsets part of the AC magnetic flux, so that the magnetic valve is not saturated.

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