CN117457347A - Magnetic control transformer - Google Patents

Magnetic control transformer Download PDF

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Publication number
CN117457347A
CN117457347A CN202311591729.6A CN202311591729A CN117457347A CN 117457347 A CN117457347 A CN 117457347A CN 202311591729 A CN202311591729 A CN 202311591729A CN 117457347 A CN117457347 A CN 117457347A
Authority
CN
China
Prior art keywords
iron core
coil
yoke
side body
magnetic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311591729.6A
Other languages
Chinese (zh)
Inventor
张福增
陈晓国
周凯
刘凯
卢威
朱志栩
李亦健
吴泳中
邸龙
袁佳歆
马光晨
张琉婷
周航
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wuhan University WHU
CSG Electric Power Research Institute
Zhaoqing Power Supply Bureau of Guangdong Power Grid Co Ltd
Original Assignee
Wuhan University WHU
CSG Electric Power Research Institute
Zhaoqing Power Supply Bureau of Guangdong Power Grid Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wuhan University WHU, CSG Electric Power Research Institute, Zhaoqing Power Supply Bureau of Guangdong Power Grid Co Ltd filed Critical Wuhan University WHU
Priority to CN202311591729.6A priority Critical patent/CN117457347A/en
Publication of CN117457347A publication Critical patent/CN117457347A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • 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
    • 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
    • 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
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/38—Auxiliary core members; Auxiliary coils or windings
    • H01F27/385—Auxiliary core members; Auxiliary coils or windings for reducing harmonics

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

The invention discloses a device, comprising: a magnetically controlled transformer, comprising: three adjacent iron core components, the three iron core components are arranged in a regular triangle mode; the side bodies of any two adjacent iron core components, which are close to each other, are wound with a first coil; each iron core component comprises an upper side yoke and a lower side yoke, and the upper side yoke and the lower side yoke are respectively wound with a second coil; a bipolar magnetic valve is arranged beside each second coil. In the invention, the bipolar magnetic valve is adopted to reduce the harmonic content of the output current of the magnetic control transformer, which is different from the external inhibition method and other methods requiring additional input of a harmonic control device, and has the advantages of low cost and simple structure.

Description

Magnetic control transformer
Technical Field
The invention relates to the technical field of transformers, in particular to a magnetic control transformer.
Background
With more and more high-proportion new energy being connected into a power system, unstable fluctuation of the terminal voltage of the power system can occur, and the terminal voltage is easy to rise and even exceeds the allowable range of the power system when in light load. However, the magnetic valve type magnetic control transformer based on the core magnetic saturation working principle inevitably generates higher harmonics in the dynamic adjustment process. As the capacity of the magnetic control transformer increases, the harmonic content of the output increases, and too high harmonic can cause damage to the power system.
Disclosure of Invention
The invention provides a magnetic control transformer, which solves the technical problems that the magnetic control transformer inevitably generates higher harmonic waves in the dynamic adjustment process, and the power system is damaged by the excessive harmonic waves.
The invention provides a magnetic control transformer, comprising: three adjacent iron core components, wherein the three iron core components are arranged in a regular triangle manner;
the side bodies of any two adjacent iron core components, which are close to each other, are wound with a first coil;
each iron core assembly comprises an upper side yoke and a lower side yoke, and second coils are respectively wound on the upper side yoke and the lower side yoke;
a bipolar magnetic valve is arranged beside each second coil.
Preferably, each of the iron core assemblies further includes two oppositely disposed iron cores;
each iron core comprises a first side body, and a second side body and a third side body which are respectively perpendicular to the upper side and the lower side of the first side body.
Preferably, the upper side yoke is fixedly arranged at the top of the second side bodies of the two oppositely arranged iron cores; the lower side yoke is fixedly arranged at the tops of the third side bodies of the two oppositely arranged iron cores.
Preferably, the upper side yoke and the lower side yoke each comprise a fourth side body, and a fifth side body and a sixth side body which are respectively perpendicular to the left side and the right side of the fourth side body;
the fifth side body and the sixth side body of the upper side yoke are respectively and vertically arranged at the top of the second side bodies of the two oppositely arranged iron cores;
the fifth side body and the sixth side body of the lower side yoke are respectively and vertically arranged at the top parts of the third side bodies of the two oppositely arranged iron cores.
Preferably, gaps are reserved between the second side bodies and the third side bodies of the two oppositely arranged iron cores, and the bipolar magnetic valve is arranged at the gaps.
Preferably, the bipolar magnetic valve comprises a small section and two middle section sections arranged on two sides of the small section.
Preferably, the sum of the lengths of the two middle section sections is the same as the length of the small section;
the second side body and the third side body have the same corresponding first sectional area, the second sectional area of the small section is one third of the first sectional area, and the third sectional area of the middle section is two thirds of the first sectional area.
Preferably, the first coil is an ac coil; the alternating current coil is wound on the first side bodies of the two adjacent iron cores.
Preferably, the second coil is a direct current coil; the direct current coils are wound on the fourth side body of each side yoke.
Preferably, the upper side yoke and the lower side yoke are both U-shaped side yokes; the iron core is a U-shaped iron core.
From the above technical scheme, the invention has the following advantages:
the invention provides a magnetic control transformer, comprising: three adjacent iron core components, the three iron core components are arranged in a regular triangle mode; the side bodies of any two adjacent iron core components, which are close to each other, are wound with a first coil; each iron core component comprises an upper side yoke and a lower side yoke, and the upper side yoke and the lower side yoke are respectively wound with a second coil; a bipolar magnetic valve is arranged beside each second coil. In the invention, the bipolar magnetic valve is adopted to reduce the harmonic content of the output current of the magnetic control transformer, which is different from the method of external inhibition and the like, which requires additional input of a harmonic control device, the cost is low and the structure is simple, thereby solving the technical problems that the magnetic control transformer inevitably generates higher harmonic in the dynamic regulation process and the damage to a power system is caused by the excessive harmonic.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is an overall schematic diagram of a magnetic control transformer provided in the present application;
FIG. 2 is a schematic illustration of a bipolar magnetic valve provided herein;
FIG. 3 is an equivalent graph of the magnetization characteristics of the bipolar magnetic valve provided by the present application in a simulation curve;
wherein, the reference numerals are as follows: the magnetic core comprises a core 1, an upper side yoke 2, a lower side yoke 3, a bipolar magnetic valve 4, a small section 41, a middle section 42, a first coil 5 and a second coil 6.
Detailed Description
The embodiment of the invention provides a magnetic control transformer, which is used for solving the technical problems that higher harmonic waves are inevitably generated in the dynamic adjustment process of the magnetic control transformer, and the power system is damaged by the excessive harmonic waves.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present 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.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Referring to fig. 1, an embodiment of a magnetic control transformer provided in the present application includes: three adjacent iron core components, the three iron core components are arranged in a regular triangle mode; the side bodies of any two adjacent iron core components, which are close to each other, are wound with a first coil 5; each iron core component comprises an upper side yoke 2 and a lower side yoke 3, and the upper side yoke 2 and the lower side yoke 3 are respectively wound with a second coil 6; a bipolar magnetic valve 4 is arranged next to each second coil 6.
In this embodiment, the three iron core components are arranged in a regular triangle manner, so that the harmonic wave of the magnetic control transformer can be reduced, and the bipolar magnetic valve 4 can be used for limiting the harmonic wave content of the magnetic control transformer.
In a preferred embodiment, each core assembly further comprises two oppositely disposed cores 1; each iron core 1 comprises a first side body, a second side body and a third side body which are respectively perpendicular to the upper side and the lower side of the first side body.
In a preferred embodiment, the upper side yoke 2 is fixedly arranged on top of the second side bodies of the two oppositely arranged iron cores 1; the lower side yoke 3 is fixedly arranged at the top of the third side bodies of the two oppositely arranged iron cores 1.
In a preferred embodiment, the upper and lower yokes 2 and 3 each include a fourth side body and fifth and sixth side bodies perpendicular to the left and right sides of the fourth side body, respectively; the fifth side body and the sixth side body of the upper side yoke 2 are respectively and vertically arranged at the top of the second side bodies of the two oppositely arranged iron cores 1; the fifth side body and the sixth side body of the lower yoke 3 are respectively vertically arranged at the top of the third side bodies of the two oppositely arranged iron cores 1.
In a preferred embodiment, a gap is left between the second side and the third side of the two oppositely arranged cores 1, and a bipolar magnetic valve 4 is arranged at the gap.
It will be appreciated that the bipolar magnetic valve 4 is disposed in the gap and that the bipolar magnetic valve 4 is fixedly connected to the two oppositely disposed cores 1.
In a preferred embodiment, the first coil 5 is an alternating current coil; the ac coil is wound around the first side of the adjacent two cores 1.
It should be noted that, three first coils 5 wound in the magnetic control transformer correspond to three-phase currents respectively, and each phase of high-low voltage ac winding is wound on the iron core 1 to perform a transformation function.
In a preferred embodiment, the second coil 6 is a direct current coil; the direct current coils are wound on the fourth side body of each side yoke.
A direct-current excitation coil is wound on the side yoke, and because the bipolar magnetic valve 4 is close to the upper side yoke 2 or the lower side yoke 3, magnetic fluxes passing through the bipolar magnetic valve 4 are overlapped by direct-current magnetic fluxes and alternating-current magnetic fluxes, namely magnetic fields generated by the alternating-current coil and the direct-current coil pass through the bipolar magnetic valve 4, and the magnetic fluxes applied to the bipolar magnetic valve 4 can achieve an overlapped effect;
specifically, in the iron core assembly, the directions of direct-current magnetic fluxes generated by the upper side yoke 2 and the lower side yoke 3 are the same; since the current passing through the ac coil alternates between positive and negative half cycles, the direction of the generated magnetic field also changes, so that the ac magnetic flux generated by the iron core 1 will be superimposed with the dc magnetic flux at one bipolar magnetic valve 4 in the iron core assembly to saturate the bipolar magnetic valve 4, and the ac magnetic flux will be partially cancelled by the dc magnetic flux at the other bipolar magnetic valve 4, i.e. the other bipolar magnetic valve 4 is not saturated;
in other words, when the direct-current magnetic flux and the alternating-current magnetic flux are in the same direction, the bipolar magnetic valve 4 reaches a magnetic saturation state; when the direct-current magnetic flux and the alternating-current magnetic flux are in opposite directions, the bipolar magnetic valves 4 are in a desaturated state, and therefore, when the magnetic flux is applied, each bipolar magnetic valve 4 is switched between a magnetically saturated state and a desaturated state.
At any moment, one bipolar magnetic valve 4 in the same iron core component is always in a saturated state, at the moment, the iron core component has smaller magnetic conductivity and larger magnetic resistance, the corresponding inductance is smaller, and the inductance is equivalent to an excitation inductance in the magnetic control transformer, so that the effect of supplementing reactive power can be achieved.
Referring to fig. 2, in a preferred embodiment, the bipolar magnetic valve includes a small cross-section 41 and two middle cross-section 42 disposed on opposite sides of the small cross-section 41.
In a preferred embodiment, the sum of the lengths of the two middle section segments 42 is the same as the length of the small section segment 41; the second side body and the third side body have the same corresponding first sectional area, the second sectional area of the small section 41 is one third of the first sectional area, and the third sectional area of the middle section 42 is two thirds of the first sectional area.
It should be noted that, the output current of the magnetic control transformer contains a certain harmonic, wherein the content of the third harmonic is the largest, during the working process of the magnetic control transformer, the bipolar magnetic valve can generate double-stage saturation, the small section 41 and the middle section 42 respectively generate different contributions to the output current, and the suppression effect on the harmonic current is provided; bipolar saturation means that at nominal operating voltage, when no dc flux is supplied, the small section 41 enters saturation and is always saturated during subsequent control; the middle section 42 with larger area is unsaturated at the beginning, and when the middle section 42 is saturated with the increase of the direct current excitation current, the middle section 42 and the small section 41 generate opposite harmonic waves respectively, which cancel each other out, so that the harmonic components contained in the output current of the magnetic control transformer are reduced.
The cross-sectional area of the preferred embodiment is the cross-sectional area of the cross-section taken perpendicular to the axis of the magnetic control transformer;
specifically, the first cross-sectional area of the core 1 is a 1 In the bipolar magnetic valve, the second cross-sectional area of the small cross-section 41 is A 2 The third cross-sectional area of the middle section 42 is A 3 The method comprises the steps of carrying out a first treatment on the surface of the Small sizeThe length of the section 41 is l 1 The sum of the lengths of the two middle section sections 42 is l 2 The method comprises the steps of carrying out a first treatment on the surface of the In order to facilitate the analysis of the magnetic field intensity of the two-stage magnetic valve, equivalent magnetic field intensity He is introduced, wherein the magnetization characteristic of the two-stage magnetic valve in a simulation curve is set as shown in FIG. 3, and the two-stage magnetic valve is obtained according to ampere loop law
H e (l 1 +l 2 )＝H 1 l 1 +H 2 l 2 (1)
Wherein H is 1 And H 2 The magnetic field strengths in the small section 41 and the medium section 42, respectively, are analyzed to obtain He as a piecewise function; the magnetization characteristics of the bipolar magnetic valve can be equivalently changed by changing the ratio of the sectional areas of the small section 41 and the middle section 42 to the length of the small section 41, and analysis shows that the harmonic current of the magnetic control transformer is equivalent to superposition of the harmonic generated by the small section 41 and the middle section 42;
let L t1 ＝l 1 /(l 1 +l 2 )，L t2 ＝l 2 /(l 1 +l 2 ) Wherein L is t1 The ratio of the core of the small section 41 to the core of the bipolar valve, L t2 The proportion of the core of the two middle section segments 42 to the core of the bipolar valve;
combining equation (1), fundamental and each subharmonic expressions can be obtained:
in the method, in the process of the invention,the fundamental current per unit value; />N=1, 2, … for each subharmonic current per unit value; beta 1 And beta 2 The magnetic saturation of the small section 41 and the two middle section 42, respectively;
wherein the folding points Bs1 and Bs2 of the equivalent magnetization curve of the bipolar magnetic valve are formed by a small section 41 and the middle section 42, bs1 and Bs2 are magnetic induction saturation values corresponding to the small section 41 and the middle section 42 respectively; in the structural design of the bipolar magnetic valve, when the design meets A 2 ＝1/3A 1 ，A 3 ＝2/3A 1 At this time, there is bs1= (1/3) × Bts, bs2= (2/3) × Bts; wherein Bts is the saturation value of the magnetic induction intensity corresponding to the bipolar magnetic valve.
When the direct-current excitation magnetic flux of the bipolar magnetic valve is controlled to be increased, the magnetic saturation of the small section 41 and the middle section 42 automatically satisfies the following relationship: when beta is 1 Beta is less than or equal to pi 2 =0; when pi < beta 1 When less than or equal to 2 pi, cos (. Beta.) 1 /2)＝1-cos(β 2 2) the analysis can find that the 3 rd harmonic phase generated by the small section 41 is opposite to the 3 rd harmonic phase generated by the middle section 42 and counteracts each other;
thus, when the bipolar magnetic valve satisfies A 2 ＝1/3A 1 ，A 3 ＝2/3A 1 ，l 1 ＝l 2 When the magnetic control transformer is used, the middle section 42 and the small section 41 can respectively generate third harmonic waves with basically equal sizes and opposite directions, and harmonic currents are mutually overlapped, so that the third harmonic waves contained in the output current of the final magnetic control transformer are reduced; the bipolar magnetic valve also plays a limiting role for fifth and seventh harmonics.
Particularly, in the preferred embodiment, the sections of the small section 41 and the middle section 42 are square, compared with the circular section, the magnetic flux of the bipolar magnetic valve with square section flowing through the magnetic valve section is more uniform and the sectional area is not wasted, so that the consumption of iron core materials can be reduced, and the cost is reduced;
in the preferred embodiment, the bipolar magnetic valve can reduce output harmonic waves of the magnetic control transformer, meanwhile, the reasonably designed bipolar magnetic valve structure can also reduce edge effect during magnetic saturation, winding loss is reduced, and the magnetic control transformer using the bipolar magnetic valve can reduce influence of harmonic waves on a power system and limit of rated capacity.
In a preferred embodiment, the upper and lower yokes 2, 2 are both U-shaped yokes; the iron core 1 is a U-shaped iron core.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A magnetically controlled transformer, comprising: three adjacent iron core components, wherein the three iron core components are arranged in a regular triangle manner;
the side bodies of any two adjacent iron core components, which are close to each other, are wound with a first coil;
each iron core assembly comprises an upper side yoke and a lower side yoke, and second coils are respectively wound on the upper side yoke and the lower side yoke;
a bipolar magnetic valve is arranged beside each second coil.
2. The magnetically controlled transformer of claim 1, wherein each core assembly further comprises two oppositely disposed cores;
each iron core comprises a first side body, and a second side body and a third side body which are respectively perpendicular to the upper side and the lower side of the first side body.
3. The magnetic transformer according to claim 2, wherein the upper side yoke is fixedly arranged on top of the second side bodies of the two oppositely arranged iron cores; the lower side yoke is fixedly arranged at the tops of the third side bodies of the two oppositely arranged iron cores.
4. The magnetic transformer of claim 1, wherein the upper and lower yokes each comprise a fourth side body and fifth and sixth side bodies perpendicular to left and right sides of the fourth side body, respectively;
the fifth side body and the sixth side body of the upper side yoke are respectively and vertically arranged at the top of the second side bodies of the two oppositely arranged iron cores;
the fifth side body and the sixth side body of the lower side yoke are respectively and vertically arranged at the top parts of the third side bodies of the two oppositely arranged iron cores.
5. The magnetic transformer of claim 2, wherein a gap is left between the second side and the third side of the two oppositely disposed cores, and the bipolar magnetic valve is disposed at the gap.
6. A magnetically controlled transformer according to claim 3, wherein the bipolar magnetic valve comprises a small cross-section and two medium cross-section sections arranged on both sides of the small cross-section.
7. The magnetic control transformer of claim 6, wherein the sum of the lengths of the two middle section segments is the same as the length of the small section segment;
the second side body and the third side body have the same corresponding first sectional area, the second sectional area of the small section is one third of the first sectional area, and the third sectional area of the middle section is two thirds of the first sectional area.
8. The magnetically controlled transformer of claim 2, wherein the first coil is an ac coil; the alternating current coil is wound on the first side bodies of the two adjacent iron cores.
9. The magnetically controlled transformer of claim 2, wherein the second coil is a dc coil; the direct current coils are wound on the fourth side body of each side yoke.
10. The magnetic control transformer of claim 2, wherein the upper and lower yokes are both U-shaped yokes; the iron core is a U-shaped iron core.
CN202311591729.6A 2023-11-27 2023-11-27 Magnetic control transformer Pending CN117457347A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311591729.6A CN117457347A (en) 2023-11-27 2023-11-27 Magnetic control transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311591729.6A CN117457347A (en) 2023-11-27 2023-11-27 Magnetic control transformer

Publications (1)

Publication Number Publication Date
CN117457347A true CN117457347A (en) 2024-01-26

Family

ID=89581854

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311591729.6A Pending CN117457347A (en) 2023-11-27 2023-11-27 Magnetic control transformer

Country Status (1)

Country Link
CN (1) CN117457347A (en)

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