CN110571023B - Vibration damper and reactor - Google Patents

Vibration damper and reactor Download PDF

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CN110571023B
CN110571023B CN201910779852.8A CN201910779852A CN110571023B CN 110571023 B CN110571023 B CN 110571023B CN 201910779852 A CN201910779852 A CN 201910779852A CN 110571023 B CN110571023 B CN 110571023B
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reactor
iron core
winding
core
magnetic
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CN110571023A (en
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张娟娟
李婷婷
盛财旺
高冲
周建辉
张静
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State Grid Smart Grid Research Institute Co ltd
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Global Energy Interconnection Research Institute
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/03—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using magnetic or electromagnetic means
    • 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
    • H01F27/33—Arrangements for noise damping
    • 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

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Regulation Of General Use Transformers (AREA)

Abstract

The invention provides a vibration damping device and a reactor, wherein the vibration damping device is applied to the reactor and comprises the following components: the reactor comprises a groove and a magnetic conduction winding, wherein the groove is formed in one end face of a pair of opposite end faces of the reactor, the magnetic conduction winding is wound on the groove and the side wall of one end face of the iron core to form an annular structure, and the magnetic conduction winding divides one end face into a first part which is not wound by the magnetic conduction winding and a second part which is wound by the magnetic conduction winding. The magnetic conduction winding is embedded in the end face of the iron core of the reactor, so that the electromagnetic force generated by the magnetic conduction winding and the original electromagnetic force act together, the effect of reducing the vibration of the iron core is achieved, and the vibration problem of the reactor is further improved.

Description

Vibration damper and reactor
Technical Field
The invention relates to the technical field of extra-high voltage direct current transmission power equipment, in particular to a vibration damping device and a reactor.
Background
The anode saturable reactor is a key device in the converter valve and is used for protecting the reliable switching-on of the thyristor. However, the anode saturable reactor bears the action of pulse voltage when the converter valve is switched on or off, and the iron core of the anode saturable reactor is generally switched between a magnetic unsaturated state and a magnetic saturated state within a time of several microseconds to tens of microseconds, so that the working current of the anode saturable reactor contains a large amount of harmonic waves, the harmonic waves can aggravate the vibration of the iron core, the higher the current frequency is, the sharper the vibration noise is caused, and the service life of the reactor and the whole noise level of a valve hall are seriously influenced. Therefore, the saturable reactor is a main vibration source in the converter valve, the aging of the saturable reactor can be accelerated by long-term high-frequency vibration, the service life of equipment is shortened, and even the fault of the whole converter valve system is caused in severe cases. How to effectively reduce the vibration and the noise of the iron core of the reactor has important engineering significance for improving the performance of the reactor, the converter valve and even a direct current transmission system.
Disclosure of Invention
In view of this, embodiments of the present invention provide a vibration damping device applied to a reactor, so as to solve the problem that the reliability of the reactor is reduced due to lack of effective control over the iron core vibration and noise of the reactor in the prior art.
According to a first aspect, an embodiment of the present invention provides a vibration damping device applied to a reactor including: the two end faces of the first iron core are in butt joint with the two end faces of the second iron core in pairs respectively to form an air gap structure, and the vibration damper comprises: the groove is arranged on a pair of opposite end faces of the first iron core and the second iron core, and the magnetic conduction winding is wound on the groove and the side wall of one end face of the iron core to form an annular structure so as to divide one end face into a first part which is not wound by the magnetic conduction winding and a second part which is wound by the magnetic conduction winding.
Optionally, the plane of the annular structure formed by the magnetic conductive winding is parallel to the air gap structure.
Optionally, the groove is disposed on the one end surface.
Optionally, the magnetic conductive winding is an electrically conductive material.
According to a second aspect, an embodiment of the present invention further provides a reactor, where the reactor includes a first iron core, a second iron core, and the vibration damping device according to the first aspect and any one of the optional embodiments thereof, where two end surfaces of the first iron core are in butt joint with two end surfaces of the second iron core, respectively, to form an air gap structure.
Optionally, the first core and the second core are U-shaped cores.
Optionally, the air gap structure is rectangular.
Optionally, the reactor further includes: and the excitation winding is arranged at one butt end face of the first iron core and the second iron core.
Optionally, the groove is provided on one of the abutting end faces in the excitation winding.
The technical scheme of the invention has the following advantages:
1. the embodiment of the invention provides a vibration damping device, which is applied to a reactor and comprises the following components: the groove is arranged on a pair of opposite end faces of the first iron core and the second iron core, the magnetic conduction winding is wound on the groove and the side wall of one end face of the iron core to form an annular structure, the plane where the magnetic conduction winding embedded into the iron core is located is parallel to the end face of the air gap of the iron core, and one end face of the magnetic conduction winding is divided into a first part which is not wound by the magnetic conduction winding and a second part which is wound by the magnetic conduction winding. The magnetic conduction winding is embedded in the end face of the iron core of the reactor, so that electromagnetic force and original electromagnetic force act together, the total electromagnetic force on the end face of the iron core is reduced, the effect of reducing iron core vibration is better, the vibration and noise problems of the reactor are improved, and the operation reliability of a converter valve system and a direct current transmission system is improved.
2. An embodiment of the present invention provides a reactor, including: the first iron core, the second iron core and the vibration damper provided by another embodiment of the invention have the advantages that two end faces of the first iron core are in butt joint with two end faces of the second iron core in pairs respectively to form an air gap structure, and electromagnetic force generated by the first iron core and the second iron core is acted with original electromagnetic force together in a mode of embedding the magnetic conduction winding at the end face of the iron core of the reactor, so that the total electromagnetic force at the end face of the iron core is reduced, the effect of reducing the vibration of the iron core is better, the vibration and noise problem of the reactor is improved, and the operation reliability of a converter valve system and a direct current transmission system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a partial structure of a reactor provided in an embodiment of the present invention;
FIG. 2 is a schematic view of a vibration damping apparatus according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an end face of a reactor core to which a magnetic conductive winding is added according to an embodiment of the present invention;
fig. 4 is a stress comparison diagram of an unencapsulated portion and an encapsulated portion of an end face of a reactor core to which a magnetic-conductive winding is added according to an embodiment of the present invention;
fig. 5 is a stress comparison diagram of a reactor core with a magnetic conductive winding and a reactor core without a magnetic conductive winding according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. Fig. 1 shows a schematic diagram of a reactor according to an embodiment of the present invention, and as shown in fig. 1, an iron core of the reactor is a racetrack iron core 1, where the racetrack iron core 1 specifically includes: a first core 11; two end faces of the second iron core 12 are in butt joint with two end faces of the first iron core 11 in pairs respectively, and an air gap structure 3 is formed at the butt joint position; one of the opposing end surfaces of the first core 11 and the second core 12 is provided in the field winding 2. A groove 4 is formed in the upper end surface of the first iron core 11 disposed in the excitation winding 2, a magnetic conductive winding 5 is wound around the groove 4 and the side wall of the first iron core 11, neither the groove 4 nor the magnetic conductive winding 5 is shown in fig. 1, and the magnetic conductive winding 5 divides the upper end surface of the first iron core 11 into a first portion S that is not wound by the magnetic conductive winding 51And a second part S wound by the magnetic conductive winding 52. In the embodiment of the present invention, the reactor core is a race-type core, that is, the first core 11 and the second core 12 are U-shaped cores, and in practical applications, those skilled in the art may use other types of reactor cores, and the present invention is not limited thereto.
Specifically, in an embodiment, as shown in fig. 2, a schematic diagram of a vibration damping device provided by an embodiment of the present invention is shown, as shown in fig. 1 and fig. 2, a core air gap structure 3 is a rectangular structure existing between a first core 11 and a second core 12 of a reactor, a square groove 4 is opened in the center of an upper end surface of the first core 11 for accommodating a magnetic conductive winding 5, in an embodiment of the present invention, the magnetic conductive winding 5 is made of a conductive material with a circular cross section, is embedded in the square groove 4, is wound around a side wall of the upper end surface of the first core 11 of the racetrack-type reactor, and keeps a plane of the magnetic conductive winding 5 parallel to an end surface at the core air gap 3.
It should be noted that, in the embodiment of the present invention, the groove 4 is formed in the upper end surface of the first iron core 11 as an example, in practical applications, the groove 4 may be formed in other end surfaces of the first iron core 11 or each end surface of the second iron core 12, and the position, size, and shape of the groove 4 may also be set according to practical needs, the present invention is not limited thereto, in addition, in the embodiment of the present invention, a conductive material with a circular cross section is selected as the magnetic conductive winding, in practical applications, a conductive material with other size and shape may also be selected as the magnetic conductive winding to be added to the iron core, as long as the same vibration damping effect can be achieved, so as to achieve the effect of reducing the iron core vibration, and the present invention is not limited thereto.
Specifically, in an embodiment, fig. 3 shows an end surface of the first iron core 11, the magnetic conduction winding 5, the groove 4 formed on the upper end surface of the first iron core 11 and the magnetic conduction winding 5 wound on the side wall of the upper end surface of the first iron core 11 divide the end surface into two parts, and as shown in fig. 3, the end surface is divided into a first part cross section S not wound by the magnetic conduction winding 51And a second partial cross-section S wound by the magnetic conductive winding 52To be coveredSecond part S of core 11 wound by magnetic conduction winding 52Indicated by shading.
The principle of reducing core vibration of the reactor provided by the embodiment of the invention will be described in detail with reference to specific application examples.
Specifically, in an embodiment, as shown in fig. 3, for a portion S of the reactor core 1 not surrounded by the magnetic permeable winding 51In the magnetic circuit, through a cross-sectional area S not surrounded by the magnetic conductive winding 51Magnetic flux phi1The instantaneous value of the magnetic flux is expressed by equation (1):
Φ1t＝Φ1sinωt (1)
wherein phi1tRepresenting the instantaneous value, Φ, of the magnetic flux passing through a section not surrounded by the magnetic-conducting winding1Representing the magnetic flux across a cross section not surrounded by the magnetic permeable winding.
Specifically, in one embodiment, as shown in fig. 3, for a portion S of the reactor core 1 surrounded by the magnetic permeable winding 52In the magnetic circuit, due to the presence of the magnetic reactance of the magnetic conductive winding itself, the cross-sectional area S enclosed by the magnetic conductive winding 5 is traversed2Magnetic flux phi2The instantaneous value of the magnetic flux is expressed by equation (2):
Figure BDA0002176234890000061
wherein phi2tRepresenting the instantaneous value, Φ, of the magnetic flux passing through the section surrounded by the magnetic-conducting winding2Representing the magnetic flux across the cross section surrounded by the magnetic conductive winding,
Figure BDA0002176234890000062
representing two magnetic fluxes phi1And phi2The resulting phase difference.
Specifically, the tangent value of the magnetic flux phase difference in the formula (2) is expressed by the formula (3):
Figure BDA0002176234890000071
wherein X represents the reactance of the magnetic conductive winding, RdThe resistance of the magnetic conductive winding is shown, R represents the air gap reluctance of the part of the iron core surrounded by the magnetic conductive winding at the air gap,
Figure BDA0002176234890000072
represents the magnetic flux phi1And phi2Resulting in a phase difference of δ2Representing the length of the air gap at the core air gap surrounded by the permeable winding.
In particular, the portion S at the core air gap 3 surrounded by the magnetically permeable winding 52The air gap reluctance of (4) is expressed by equation:
Figure BDA0002176234890000073
wherein R represents the air gap reluctance of the part of the iron core surrounded by the magnetic conduction winding at the air gap, and delta2Representing the length of the gap, S, at the core gap, surrounded by the magnetically permeable winding2Representing the cross-sectional area enclosed by the magnetic permeable winding.
Specifically, the resultant attraction force generated by the two magnetic fluxes is expressed by equation (5):
Figure BDA0002176234890000074
wherein, F1Represents the magnetic flux phi1Average value of generated suction force, F2Represents the magnetic flux phi2The average value of the generated suction force is,
Figure BDA0002176234890000075
represents the magnetic flux phi1And phi2The resulting phase difference.
Specifically, for the portion S of the reactor core 1 to which the magnetic conductive winding 5 is added, which is not surrounded by the magnetic conductive winding 51Magnetic flux phi1Average value F of generated suction force1As shown by the solid line in fig. 5, F1Expressed by equation (6):
Figure BDA0002176234890000081
wherein, F1Represents the magnetic flux phi1Average value of generated suction force, [ phi ]1Representing the magnetic flux, S, across a cross-section not surrounded by the magnetic-conductive winding1Representing the cross-sectional area not surrounded by the magnetic permeable winding.
Specifically, for the part S of the reactor core 1 with the magnetic conductive winding 5, which is surrounded by the magnetic conductive winding 52Magnetic flux phi2Average value F of generated suction force2As shown by the dashed line in fig. 5, F2Expressed by equation (7):
Figure BDA0002176234890000082
wherein, F2Represents the magnetic flux phi2Average value of generated suction force, [ phi ]2Representing the magnetic flux, S, across the cross-section surrounded by the magnetic-conductive winding2Representing the cross-sectional area enclosed by the magnetic permeable winding.
Specifically, in the reactor core 1 to which the magnetic conductive winding 5 is added, the portion S surrounded by the magnetic conductive winding 52And the part S not surrounded by the magnetic conductive winding 51The simulation data of the stress is shown in FIG. 4, and as is obvious from the results of FIG. 4, the magnetic flux phi1Average value F of generated suction force1And magnetic flux phi2Average value F of generated suction force2The two forces are out of phase so that the total force F on the reactor core 1 changes.
Under the action of electromagnetic force, the reactor iron core 1 can vibrate, the vibration amplitude of the iron core 1 can be increased along with the increase of the electromagnetic force, then modeling is respectively carried out on the reactor of the embodiment of the invention and the traditional reactor according to actual conditions, operation data of the reactor is extracted, stress conditions are compared, the result is shown in fig. 5, the dotted line in fig. 5 represents the stress condition of the traditional reactor without the magnetic conduction winding 5 in the working process, and the solid line represents the stress condition of the reactor with the magnetic conduction winding 5 in the working process. As is apparent from the results shown in fig. 5, the fluctuation range of the force applied to the core 1 is narrowed compared with that before the magnetic conductive winding 5 is added, and the electromagnetic force of the core with the magnetic conductive winding at the end face is reduced, thereby reducing the vibration of the core. Therefore, the amplitude of stress of the iron core can be reduced by reasonably selecting the magnetic conduction winding at the iron core of the reactor, and the effect of reducing the vibration of the iron core can be further achieved.
Through the cooperation of the above components, the vibration damping device provided by the embodiment of the invention enables the electromagnetic force generated by the vibration damping device to act together with the original electromagnetic force by embedding the magnetic conductive winding at the end face of the iron core of the reactor, so that the total electromagnetic force at the end face of the iron core is reduced, the effect of reducing the vibration of the iron core is better achieved, the problems of vibration and noise of the reactor are solved, and the operation reliability of the converter valve system and the direct current transmission system is improved.
An embodiment of the present invention further provides a reactor, and as shown in fig. 1, the reactor includes: in the first iron core 11, the second iron core 12 and the damping device (not shown in fig. 1) according to another embodiment of the present invention, two end faces of the first iron core 11 are respectively butted with two end faces of the second iron core 12 in pairs to form the air gap structure 3.
Through the cooperation of the above components, the reactor provided by the embodiment of the invention generates electromagnetic force and acts together with the original electromagnetic force by embedding the magnetic conductive winding at the end face of the iron core of the reactor, so that the total electromagnetic force at the end face of the iron core is reduced, the effect of reducing the vibration of the iron core is better, the problems of vibration and noise of the reactor are solved, and the operation reliability of a converter valve system and a direct current transmission system is improved.
The above examples are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above examples, those skilled in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (7)

1. A vibration damping device applied to a reactor, the reactor comprising: the reactor comprises a first iron core and a second iron core, wherein two end faces of the first iron core are in butt joint with two end faces of the second iron core in pairs respectively to form an air gap structure, and the reactor further comprises: an excitation winding provided at a pair of opposing end surfaces of the first core and the second core, wherein the vibration damping device includes:
a groove provided on one of a pair of opposing end surfaces of the first core and the second core around which the excitation winding is wound;
and the magnetic conduction winding is wound on the groove and the side wall of one end face of the iron core provided with the groove, and an annular structure is formed so as to divide the end face into a first part which is not wound by the magnetic conduction winding and a second part which is wound by the magnetic conduction winding.
2. The vibration damping device of claim 1 wherein the annular structure formed by the magnetically permeable winding lies in a plane parallel to the air gap structure.
3. The vibration damping device of claim 1 wherein said recess is disposed in said one end surface.
4. The vibration damping device of claim 1 wherein said magnetically permeable winding is an electrically conductive material.
5. A reactor, characterized in that the reactor comprises a first iron core, a second iron core and a damping device according to any one of claims 1 to 4, wherein two end faces of the first iron core are in butt joint with two end faces of the second iron core in pairs respectively to form an air gap structure;
the reactor further includes: and the excitation winding is arranged at one butt end face of the first iron core and the second iron core.
6. The reactor according to claim 5, characterized in that the first core and the second core are U-shaped cores.
7. The reactor according to claim 5, characterized in that the air gap structure is rectangular.
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JPS60154607A (en) * 1984-01-25 1985-08-14 Hitachi Ltd 3-phase reactor with gap
CN101702367B (en) * 2009-11-27 2012-07-18 中国电力科学研究院 Saturable reactor used for direct-current current transformation valve
EP2624260B1 (en) * 2012-02-02 2018-04-04 DET International Holding Limited Forward converter with magnetic component
CN104505239A (en) * 2015-01-14 2015-04-08 东南大学 Mixed magnetic biasing magnetic saturation controllable electric reactor
US11721472B2 (en) * 2017-10-25 2023-08-08 Sumitomo Electric Industries, Ltd. Coil component, circuit board, and power supply device

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