CN115331930B - Magnetic integration hybrid distribution transformer with simple structure - Google Patents
Magnetic integration hybrid distribution transformer with simple structure Download PDFInfo
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- CN115331930B CN115331930B CN202211004362.9A CN202211004362A CN115331930B CN 115331930 B CN115331930 B CN 115331930B CN 202211004362 A CN202211004362 A CN 202211004362A CN 115331930 B CN115331930 B CN 115331930B
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- 230000010354 integration Effects 0.000 title abstract description 13
- 238000004804 winding Methods 0.000 claims abstract description 198
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 79
- 229910052742 iron Inorganic materials 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims description 17
- 230000004907 flux Effects 0.000 claims description 12
- 230000007935 neutral effect Effects 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 238000003475 lamination Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 claims 1
- 230000017525 heat dissipation Effects 0.000 abstract description 4
- 238000002955 isolation Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/263—Fastening parts of the core together
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
- H01F27/266—Fastening or mounting the core on casing or support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/40—Structural association with built-in electric component, e.g. fuse
- H01F2027/408—Association with diode or rectifier
Abstract
The invention relates to a magnetic integration hybrid distribution transformer with a simple structure, and belongs to the technical field of transformers. The magnetically integrated hybrid distribution transformer includes a magnetic core structure and windings; the magnetic core structure comprises a main magnetic core and an auxiliary magnetic core, the main magnetic core comprises iron core columns and iron yokes, the iron core columns are longitudinally arranged, and windings are respectively arranged on the iron core columns; the auxiliary magnetic core comprises independent square hollow magnetic rings, and a hollow window is formed in the center of each magnetic ring; the windings comprise a high-voltage winding, a low-voltage winding and an auxiliary winding which are arranged on the iron core limb; each phase auxiliary winding is positioned above the high-voltage winding and the low-voltage winding of the phase, passes through the window of the phase auxiliary magnetic core and is wound on the core limb of the phase main magnetic core. The magnetic integrated hybrid distribution transformer has the advantages of simple structure, reduced number of discrete magnetic elements, simplified integral structure of the device, saved space required by the design of heat dissipation of the filter inductor of the transformer, and reduced volume of the hybrid distribution transformer.
Description
Technical Field
The invention belongs to the technical field of transformers, and particularly relates to a magnetic integration hybrid distribution transformer with a simple structure.
Background
Distribution transformers in power distribution networks are currently still the most important electrical devices for voltage conversion and power distribution, but lack the ability to actively manage and actively control distributed power sources and loads as energy hubs. In this context, related research and technological workers have proposed the concept of hybrid distribution transformers. The hybrid distribution transformer is a novel controllable distribution transformer realized by improving the design of a traditional distribution transformer and then connecting a fully-controlled power electronic device into the transformer. Compared with the traditional distribution transformer, the hybrid distribution transformer not only has the advantages of high efficiency and reliability of the traditional distribution transformer, but also can greatly improve the controllability of the traditional distribution transformer, so that the hybrid distribution transformer is very suitable for the intelligent development requirement of a future distribution network.
The hybrid distribution transformer in the prior art comprises a main transformer, a series isolation transformer and a magnetic integration hybrid distribution transformer of a converter unit, wherein the main transformer and the series isolation transformer share a middle iron yoke to realize weak coupling integration of the main transformer and the series isolation transformer; and magnetic leakage iron cores are arranged between the primary winding and the control winding and between the valve side winding and the net side winding, so that leakage inductance between corresponding windings is increased, and the magnetic integration design of the output connection inductance of the transformer and the converter is realized by replacing the inductance with the leakage inductance. However, this structure has two disadvantages:
1. the series isolation transformer is used in the structure, the number of windings is large, and the whole structure of the device is still complex;
2. in order to realize magnetic integration, the structure arranges magnetic leakage iron cores between the primary winding and the control winding and between the valve side winding and the net side winding, and at least 6 three phases are needed, so that the number of discrete magnetic elements is still more, and the loss is larger; in the structure, leakage inductance is required to be adjusted by adjusting the air gap between the leakage iron core and the iron yoke in the control winding and the valve side winding, the adjustment mode is not simple and convenient, and the adjustment range is small.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, and provides the magnetic integrated hybrid distribution transformer with a simple structure, which can reduce the number of discrete magnetic elements, simplify the whole structure of the device, omit the space required by the heat dissipation design of the filter inductor of the transformer and reduce the volume of the hybrid distribution transformer.
According to one aspect of the present invention, there is provided a magnetically integrated hybrid distribution transformer of simple structure, comprising a transformer unit comprising a magnetic core structure and windings; the magnetic core structure comprises a main magnetic core and an auxiliary magnetic core, the main magnetic core comprises iron core columns and iron yokes, the iron core columns are longitudinally arranged, and windings are respectively arranged on the iron core columns; the iron yokes are arranged between the iron core limbs and used for fixing the iron core limbs; the auxiliary magnetic core comprises independent square hollow magnetic rings, and a hollow window is formed in the center of each magnetic ring; the windings comprise a high-voltage winding, a low-voltage winding and an auxiliary winding which are arranged on the iron core limb; the windings are sequentially arranged on the iron core column from left to right according to the sequence of A phase, B phase and C phase; each phase auxiliary winding is positioned above the high-voltage winding and the low-voltage winding of the phase, passes through the window of the phase auxiliary magnetic core and is wound on the core limb of the phase main magnetic core.
Preferably, the high-voltage winding and the low-voltage winding of each phase winding are concentrically wound on a main magnetic core limb of the phase by adopting a layered coil, and the low-voltage winding and the high-voltage winding are sequentially arranged from the core limb outwards.
Preferably, the leakage inductance between the auxiliary winding and the high voltage winding of each phase is adjusted by adjusting the distance between the auxiliary winding and the high voltage winding of each phase.
Preferably, the method comprises the steps of,
and a new magnetic flux path is formed by winding an auxiliary magnetic core between each phase of auxiliary winding and each phase of high-voltage winding, so that leakage inductance between each phase of high-voltage winding and each phase of auxiliary winding is improved.
Preferably, the method comprises the steps of,
the auxiliary magnetic cores are independent in three phases, and the size and the material of each auxiliary magnetic core are determined according to the needed leakage inductance frequency and the leakage inductance value.
Preferably, the method comprises the steps of,
the two groups of iron yokes are respectively arranged at the upper end and the lower end of the main magnetic core iron core column; the iron yoke in the magnetic core structure is spliced with the main magnetic core iron core column in a 45-degree oblique joint step lap joint mode; each stage of lamination of the iron core structure adopts silicon steel sheets.
Preferably, the magnetically integrated hybrid distribution transformer comprises a converter unit connected to the auxiliary windings per phase and to the low voltage windings per phase.
Preferably, the converter unit includes:
an AC-DC converter, a DC-AC converter, a DC bus capacitor common to the AC-DC converter and the DC-AC converter, a filter inductance, and a three-phase four-wire AC voltage filter.
Preferably, the AC-DC converter comprises parallel current control legs; the DC-AC converter comprises a voltage control bridge arm and a zero sequence control bridge arm which are connected in parallel; the rear end of the filter inductor connected behind the voltage control bridge arm is a three-phase voltage output end of the converter unit, and the rear end of the filter inductor connected behind the zero sequence control bridge arm is a zero sequence output end of the converter unit; the three-phase four-wire alternating current voltage filter is connected in parallel between the three-phase voltage output end and the zero sequence output end of the converter unit; the auxiliary winding is connected with the middle point of the current control bridge arm, the low-voltage winding is connected with the three-phase voltage output end of the converter unit, and the zero sequence output end of the converter unit is connected with the neutral line of the three-phase four-wire system load.
Preferably, the method comprises the steps of,
the high-voltage winding is connected into a power grid through a triangle connection method, the low-voltage winding is respectively connected with a three-phase four-wire system load and each phase voltage output end of the converter unit, and the auxiliary winding is connected with the current output end of the converter unit through the triangle connection method.
The beneficial effects are that: the invention adopts a structure that the high-voltage winding and the low-voltage winding are concentrically wound on the same iron core column and the auxiliary winding is separately wound, thereby increasing the distance between the auxiliary winding and the high-voltage winding and increasing the leakage inductance between the high-voltage winding and the auxiliary winding. The structure can increase leakage inductance while keeping compact structure, is convenient for realizing magnetic integration of filter inductance and winding leakage inductance, and can conveniently and flexibly adjust leakage inductance by adjusting the distance between the auxiliary winding and the high-voltage winding; by adding the auxiliary magnetic core between the high-voltage winding and the low-voltage winding, leakage inductance between the high-voltage winding and the low-voltage winding of the transformer is improved, a filter inductor of the transformer connected with the auxiliary winding is omitted, magnetic integration of the filter inductor of the transformer and the transformer winding is realized, the number of discrete magnetic elements can be reduced, and the integral structure of the device is simplified. In addition, the auxiliary magnetic core can jointly dissipate heat with the main magnetic core, so that the space required by the heat dissipation design of the filter inductor of the converter is saved, and the volume of the hybrid distribution transformer is reduced as a whole.
Features and advantages of the present invention will become apparent by reference to the following drawings and detailed description of embodiments of the invention.
Drawings
Fig. 1 (a), 1 (b) and 1 (c) are schematic circuit topologies and connection relationships of components of a main circuit in a magnetically integrated hybrid distribution transformer according to the present invention;
fig. 2 is a three-dimensional view of the electromagnetic body of the magnetically integrated hybrid distribution transformer of the present invention.
Fig. 3 is a graph of electromagnetic simulation results of a magnetically integrated hybrid distribution transformer of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a magnetic integration hybrid distribution transformer with a simple structure, which comprises a transformer unit, wherein the transformer unit comprises a magnetic core structure and a winding; the magnetic core structure comprises a main magnetic core and an auxiliary magnetic core, the main magnetic core comprises iron core columns and iron yokes, the iron core columns are longitudinally arranged, and windings are respectively arranged on the iron core columns; the iron yokes are arranged between the iron core limbs and used for fixing the iron core limbs; the auxiliary magnetic core comprises independent square hollow magnetic rings, and a hollow window is formed in the center of each magnetic ring; the windings comprise a high-voltage winding, a low-voltage winding and an auxiliary winding which are arranged on the iron core limb; the windings are sequentially arranged on the iron core column from left to right according to the sequence of A phase, B phase and C phase; each phase auxiliary winding is positioned above the high-voltage winding and the low-voltage winding of the phase, passes through the window of the phase auxiliary magnetic core and is wound on the core limb of the phase main magnetic core.
Preferably, the high-voltage winding and the low-voltage winding of each phase winding are concentrically wound on a main magnetic core limb of the phase by adopting a layered coil, and the low-voltage winding and the high-voltage winding are sequentially arranged from the core limb outwards.
Preferably, the leakage inductance between the auxiliary winding and the high voltage winding of each phase is adjusted by adjusting the distance between the auxiliary winding and the high voltage winding of each phase.
Specifically, under the condition that the total amount of magnetic flux is unchanged, the larger the magnetic flux in the material with high magnetic permeability is, the magnetic flux generated by current in the windings mainly passes through the main iron core because the magnetic permeability of the iron core is far greater than that of air, and leakage inductance between the windings is smaller. In the original concentric circle winding structure of the high-voltage winding, the low-voltage winding and the auxiliary winding, the leakage inductance is smaller due to the small interval between the windings. After the distance between the high-voltage winding and the auxiliary winding is increased by the structure, the coupling effect of the high-voltage winding and the auxiliary winding through the main iron core is weakened, the magnetic flux in the main iron core is reduced, the leakage magnetic flux is increased, and the leakage inductance is also increased.
Preferably, the method comprises the steps of,
and a new magnetic flux path is formed by winding an auxiliary magnetic core between each phase of auxiliary winding and each phase of high-voltage winding, so that leakage inductance between each phase of high-voltage winding and each phase of auxiliary winding is improved.
Specifically, after the auxiliary magnetic core is added, the magnetic permeability of the auxiliary magnetic core is relatively high, and after the auxiliary magnetic core is added between the high-voltage winding and the auxiliary winding, the magnetic flux is redistributed, the magnetic flux passing through the auxiliary magnetic core is increased, and the magnetic flux passing through the main iron core is reduced, which is equivalent to the increase of leakage inductance.
Preferably, the method comprises the steps of,
the auxiliary magnetic cores are independent in three phases, and the size and the material of each auxiliary magnetic core are determined according to the needed leakage inductance frequency and the leakage inductance value.
Preferably, the method comprises the steps of,
the two groups of iron yokes are respectively arranged at the upper end and the lower end of the main magnetic core iron core column; the iron yoke in the magnetic core structure is spliced with the main magnetic core iron core column in a 45-degree oblique joint step lap joint mode; each stage of lamination of the iron core structure adopts silicon steel sheets.
Preferably, the magnetically integrated hybrid distribution transformer comprises a converter unit connected to the auxiliary windings per phase and to the low voltage windings per phase.
Preferably, the converter unit includes:
an AC-DC converter, a DC-AC converter, a DC bus capacitor common to the AC-DC converter and the DC-AC converter, a filter inductance, and a three-phase four-wire AC voltage filter.
Preferably, the AC-DC converter comprises parallel current control legs; the DC-AC converter comprises a voltage control bridge arm and a zero sequence control bridge arm which are connected in parallel; the rear end of the filter inductor connected behind the voltage control bridge arm is a three-phase voltage output end of the converter unit, and the rear end of the filter inductor connected behind the zero sequence control bridge arm is a zero sequence output end of the converter unit; the three-phase four-wire alternating current voltage filter is connected in parallel between the three-phase voltage output end and the zero sequence output end of the converter unit; the auxiliary winding is connected with the middle point of the current control bridge arm, the low-voltage winding is connected with the three-phase voltage output end of the converter unit, and the zero sequence output end of the converter unit is connected with the neutral line of the three-phase four-wire system load.
Preferably, the method comprises the steps of,
the high-voltage winding is connected into a power grid through a triangle connection method, the low-voltage winding is respectively connected with a three-phase four-wire system load and each phase voltage output end of the converter unit, and the auxiliary winding is connected with the current output end of the converter unit through the triangle connection method.
For a better understanding of the present invention, the following describes in detail the implementation of the magnetically integrated hybrid distribution transformer of the present invention with simple structure in conjunction with fig. 1 (a), 1 (b), 1 (c), 2, and 3.
The invention has simple structure, and the main circuit of the magnetic integrated hybrid distribution transformer comprises a transformer unit 16 and a converter unit 6; as shown in fig. 1 (a), the windings of the transformer unit 15 include an a-phase high-voltage winding 1a, a B-phase high-voltage winding 1B, a C-phase high-voltage winding 1C, an a-phase low-voltage winding 2a, a B-phase low-voltage winding 2B, a C-phase low-voltage winding 2C, an a-phase auxiliary winding 3a, a B-phase auxiliary winding 3B, and a C-phase auxiliary winding 3C. A. The head/tail end of each phase of the B, C three-phase high-voltage winding is A/X, B/Y, C/Z in sequence, the head/tail end of each phase of the A, B, C three-phase low-voltage winding is a2/x2, b2/y2 and c2/Z2 in sequence, and the head/tail end of each phase of the A, B, C three-phase auxiliary winding is a3/x3, b3/y3 and c3/Z3 in sequence; the method comprises the steps of providing the head ends of a high-voltage winding, a low-voltage winding and an auxiliary winding as homonymous ends; the high-voltage windings are connected into a power grid by adopting a triangle connection method, specifically, the head ends A, B, C of the A, B, C three-phase high-voltage windings 1a, 1B and 1C are connected into the power grid, meanwhile, the head end A of 1a is connected with the tail end Z of 1C, the head end B of 1B is connected with the tail end X of 1a, and the head end C of 1C is connected with the tail end Y of 1B.
As shown in fig. 1 (b), the inverter unit 6 is composed of 1 AC-DC converter 7, 1 DC-AC converter 8, 1 DC bus capacitor 9 common to the AC-DC converter and the DC-AC converter, 4 filter inductors 13, and 1 AC output filter 14. The AC-DC converter 7 comprises 3 parallel current control bridge arms, each phase of current bridge arm is formed by connecting two switching tubes 10 in series, the DC-AC converter comprises 3 parallel voltage control bridge arms and 1 zero sequence control bridge arm, each phase of voltage bridge arm is formed by connecting two switching tubes 11 in series, and each zero sequence control bridge arm is formed by connecting two switching tubes 12 in series; the auxiliary windings of each phase are connected with the current output end of each phase of the converter unit by adopting a triangle connection method, specifically, the head ends a3, b3 and c3 of the A, B, C three-phase auxiliary windings 3a, 3b and 3c are connected with the three-phase current output ends u3, v3 and w3 of the converter unit A, B, C, meanwhile, the head end a3 of the 3a is connected with the tail end z3 of the 3c, the head end b3 of the 3b is connected with the tail end x3 of the 3a, and the head end c3 of the 3c is connected with the tail end y3 of the 3 b.
As shown in fig. 1 (b) and fig. 1 (c), the low-voltage windings of each phase are respectively connected with the load and the voltage output end of each phase of the converter unit, the zero-sequence output end of the converter unit is connected with the neutral line of the three-phase four-wire system load 15, specifically, the head ends a2, b2 and c2 of the A, B, C three-phase low-voltage windings 2a, 2b and 2c are connected with the front ends u2, v2 and w2 of the A, B, C three-phase load 15, the tail ends x2, y2 and z2 of the A, B, C three-phase low-voltage windings 2a, 2b and 2c are respectively connected with the three-phase voltage output ends u2y, v2y and w2y of the converter unit, and the zero-sequence output end ny2 of the converter unit is connected with the neutral line n2 of the three-phase four-wire system load 15.
Fig. 2 is a three-dimensional view of the electromagnetic body of the magnetically integrated hybrid distribution transformer of the present invention with a simple structure. As shown in fig. 2, the above-described magnetic integrated hybrid distribution transformer core structure with a simple structure includes a main core including 3 legs including a-phase leg 4a, B-phase leg 4B, and C-phase leg 4C, and an auxiliary core, and a yoke. The auxiliary magnetic cores are three independent square hollow magnetic rings, and the hollow in the center of each magnetic ring forms 1 window and comprises an A-phase auxiliary magnetic core 5a, a B-phase auxiliary magnetic core 5B and a C-phase auxiliary magnetic core 5C; the three-phase auxiliary magnetic cores 5a, 5b, 5c are vertically arranged on the three-phase iron core posts 4a, 4b, 4c in the direction that the windows are perpendicular to the horizontal plane respectively; the A-phase low-voltage winding 2a and the A-phase high-voltage winding 1a are layered windings, and are concentrically wound on the A-phase main magnetic core limb 4a from inside to outside, and the A-phase auxiliary winding 3a passes through a window of the A-phase auxiliary magnetic core and is wound on the A-phase main magnetic core limb 4 a; the B-phase low-voltage winding 2B and the high-voltage winding 1B are layered windings, and are concentrically wound on the B-phase main magnetic core limb 4B from inside to outside, and the B-phase auxiliary winding 3B passes through a window of the B-phase auxiliary magnetic core and is wound on the B-phase main magnetic core limb 4B; the C-phase low-voltage winding 2C and the high-voltage winding 1C adopt layered windings, are concentrically wound on the C-phase main magnetic core limb 4C from inside to outside, and the C-phase auxiliary winding 3C passes through a window of the C-phase auxiliary magnetic core and is wound on the C-phase main magnetic core limb 4C.
As shown in fig. 2, the three-phase auxiliary magnetic cores are independent of each other, and can flexibly adjust leakage inductance according to needs.
Fig. 3 is a diagram of electromagnetic simulation results of the magnetic integrated hybrid distribution transformer with a simple structure. As shown in fig. 3, the electromagnetic simulation result provided by the embodiment of the invention shows that:
1. the part of the auxiliary magnetic core between the auxiliary winding and the high-voltage winding has higher magnetic induction intensity (green is shown in the figure, and the color of the part with higher magnetic induction intensity is the same as that of the part with higher magnetic induction intensity in the main iron core), which indicates that more magnetic flux passes through the auxiliary magnetic core, the leakage inductance between the auxiliary winding and the high-voltage winding is obviously improved, and the effectiveness of the structural design of the invention is verified.
2. The main core and the auxiliary core of the magnetic integrated hybrid distribution transformer with simple structures are not saturated, so that the design requirement of the transformer core is met, and the practical feasibility of the structural design of the magnetic integrated hybrid distribution transformer is verified.
The invention adopts a structure that the high-voltage winding and the low-voltage winding are concentrically wound on the same iron core column and the auxiliary winding is separately wound, thereby increasing the distance between the auxiliary winding and the high-voltage winding and increasing the leakage inductance between the high-voltage winding and the auxiliary winding. The structure can increase leakage inductance while keeping compact structure, is convenient for realizing magnetic integration of filter inductance and winding leakage inductance, and can conveniently and flexibly adjust leakage inductance by adjusting the distance between the auxiliary winding and the high-voltage winding; by adding the auxiliary magnetic core between the high-voltage winding and the low-voltage winding, leakage inductance between the high-voltage winding and the low-voltage winding of the transformer is improved, a filter inductor of the transformer connected with the auxiliary winding is omitted, magnetic integration of the filter inductor of the transformer and the transformer winding is realized, the number of discrete magnetic elements can be reduced, and the integral structure of the device is simplified. In addition, the auxiliary magnetic core can jointly dissipate heat with the main magnetic core, so that the space required by the heat dissipation design of the filter inductor of the converter is saved, and the volume of the hybrid distribution transformer is reduced as a whole.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the specification and drawings of the present invention or direct/indirect application in other related technical fields are included in the scope of the present invention.
Claims (7)
1. A magnetically integrated hybrid distribution transformer of simple construction, characterized in that it comprises a transformer unit comprising a magnetic core structure and windings; the magnetic core structure comprises a main magnetic core and an auxiliary magnetic core, the main magnetic core comprises iron core columns and iron yokes, the iron core columns are longitudinally arranged, and windings are respectively arranged on the iron core columns; the iron yokes are arranged between the iron core limbs and used for fixing the iron core limbs; the auxiliary magnetic core comprises independent square hollow magnetic rings, and a hollow window is formed in the center of each magnetic ring; the windings comprise a high-voltage winding, a low-voltage winding and an auxiliary winding which are arranged on the iron core limb; the windings are sequentially arranged on the iron core column from left to right according to the sequence of A phase, B phase and C phase; each phase of auxiliary winding is positioned above the corresponding phase high-voltage winding and low-voltage winding, passes through a window of the corresponding phase auxiliary magnetic core and is wound on the corresponding phase main magnetic core iron core column;
the high-voltage winding and the low-voltage winding of each phase winding are concentrically wound on a main magnetic core iron core column of the phase by adopting a layered coil, and the low-voltage winding and the high-voltage winding are sequentially arranged outwards from the iron core column;
adjusting leakage inductance between each phase of the auxiliary winding and each phase of the high-voltage winding by adjusting the distance between each phase of the auxiliary winding and each phase of the high-voltage winding;
and a new magnetic flux path is formed by winding an auxiliary magnetic core between each phase of the auxiliary winding and each phase of the high-voltage winding, so that leakage inductance between each phase of the high-voltage winding and each phase of the auxiliary winding is improved.
2. The magnetically integrated hybrid distribution transformer according to claim 1, characterized in that,
the auxiliary magnetic cores are independent in three phases, and the size and the material of each phase of the auxiliary magnetic cores are determined according to the needed leakage inductance frequency and the leakage inductance value.
3. The magnetically integrated hybrid distribution transformer according to claim 1, characterized in that,
the two groups of iron yokes are respectively arranged at the upper end and the lower end of the main magnetic core iron core column; the iron yoke in the magnetic core structure is spliced with the main magnetic core iron core column in a 45-degree oblique joint step lap joint mode; each stage of lamination of the magnetic core structure adopts silicon steel sheets.
4. The magnetically integrated hybrid distribution transformer of claim 1, comprising a converter unit connected to each phase of the auxiliary winding and each phase of the low voltage winding.
5. The magnetically integrated hybrid distribution transformer of claim 4, wherein the converter unit comprises:
an AC-DC converter, a DC-AC converter, a DC bus capacitor common to the AC-DC converter and the DC-AC converter, a filter inductance, and a three-phase four-wire AC voltage filter.
6. The magnetically integrated hybrid distribution transformer of claim 5, wherein the AC-DC converter comprises parallel current control legs; the DC-AC converter comprises a voltage control bridge arm and a zero sequence control bridge arm which are connected in parallel; the rear end of the filter inductor connected behind the voltage control bridge arm is a three-phase voltage output end of the converter unit, and the rear end of the filter inductor connected behind the zero sequence control bridge arm is a zero sequence output end of the converter unit; the three-phase four-wire alternating current voltage filter is connected in parallel between the three-phase voltage output end and the zero sequence output end of the converter unit; the auxiliary winding is connected with the middle point of the current control bridge arm, the low-voltage winding is connected with the three-phase voltage output end of the converter unit, and the zero sequence output end of the converter unit is connected with the neutral line of the three-phase four-wire system load.
7. The magnetically integrated hybrid distribution transformer according to claim 6, characterized in that,
the high-voltage winding is connected into a power grid through a triangle connection method, the low-voltage winding is respectively connected with a three-phase four-wire system load and each phase voltage output end of the converter unit, and the auxiliary winding is connected with the current output end of the converter unit through the triangle connection method.
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| WO2016151225A1 (en) * | 2015-03-21 | 2016-09-29 | Emerson Network Power Industrial Systems | Three-phase transformer for twelve-phase rectifier |
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