CN117388780B - Multi-element model-based transformer wide-area direct-current magnetic bias testing method and device - Google Patents
Multi-element model-based transformer wide-area direct-current magnetic bias testing method and device Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 52
- 238000004088 simulation Methods 0.000 claims abstract description 36
- 238000004364 calculation method Methods 0.000 claims abstract description 24
- 230000005284 excitation Effects 0.000 claims abstract description 4
- 238000004804 winding Methods 0.000 claims description 46
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
- 239000011162 core material Substances 0.000 claims description 13
- 230000035699 permeability Effects 0.000 claims description 5
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 230000001276 controlling effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000010998 test method Methods 0.000 abstract description 4
- 230000009897 systematic effect Effects 0.000 abstract description 3
- 230000000295 complement effect Effects 0.000 abstract description 2
- 229920006395 saturated elastomer Polymers 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to the technical field of transformer direct current magnetic bias, and discloses a transformer wide-area direct current magnetic bias test method and device based on a multiple model, wherein the transformer wide-area magnetic bias test device based on the multiple model is built and comprises a magnetic saturation type controllable reactor, a magnetic bias control module and a multi-physical field finite element model simulation calculation module; the magnetic bias control module is adjusted to test the vibration noise of the magnetic saturation type controllable reactor under the deep magnetic bias; according to the vibration noise test result of the magnetic saturation type controllable reactor, the adjustment model excitation and boundary conditions of the multi-physical-field finite element model simulation calculation module are determined, the deep magnetic bias test is carried out in the multi-physical-field finite element model simulation calculation module, and the physical characteristics of the transformer to be tested under the wide-area magnetic bias are fitted according to the result. According to the invention, the state of the transformer under the deep bias of the transformer to be side is obtained through fitting of the magnetic saturation type controllable reactor, and the DC bias magnetic energy test can be more scientific and systematic by combining simulation calculation with the complementary perfect data.
Description
Technical Field
The invention belongs to the technical field of transformer direct current magnetic bias, and particularly relates to a transformer wide-range direct current magnetic bias test method and device based on a multivariate model.
Background
The extra-high voltage direct current engineering solves the problem of unbalanced energy distribution in China to a great extent, but when the working condition of monopolar earth operation occurs in direct current transmission, an operating transformer in a power grid near a direct current grounding electrode is at risk of direct current magnetic bias. The problems of no-load loss, noise, iron core temperature rise and the like can occur when the transformer generates direct-current magnetic bias, the safe and stable operation of the transformer is affected very adversely, and the whole power system can be endangered greatly.
Considering the safety of a transformer product, the physical test of the transformer under deep magnetic bias cannot be carried out in a factory or on site, so that the prior art mainly tests the influence of direct current magnetic bias on the transformer by a finite element method.
Disclosure of Invention
In order to develop a test on the DC bias magnetic resistance of the transformer in the deep bias magnetic state, the invention provides a transformer wide-area DC bias magnetic test method and device based on a multivariate model, the transformer state of the transformer to be tested in the deep bias magnetic state is obtained through fitting a magnetic saturation type controllable reactor, and the DC bias magnetic energy test method can be more scientific and systematic by combining the complete data of a multi-physical-field finite element model simulation calculation module.
The present invention is so achieved. A transformer wide-area direct-current magnetic bias testing method based on a multivariate model comprises the following steps:
Step one, constructing a transformer wide-area magnetic bias testing device of a multi-element model, wherein the transformer wide-area magnetic bias testing device comprises a magnetic saturation type controllable reactor, a magnetic bias control module and a multi-physical field finite element model simulation calculation module;
Step two, acquiring the iron core size parameter of the transformer to be tested and the electromagnetic and mechanical characteristic parameters of the silicon steel sheet used, and constructing a multi-physical-field finite element model simulation calculation module of the transformer to be tested; the magnetic saturation type controllable reactor is adjusted according to the size proportion of the iron core;
Step three, adjusting a magnetic bias control module, and testing vibration noise of the magnetic saturation type controllable reactor under deep magnetic bias;
And fourthly, determining the adjustment model excitation and boundary conditions of the multi-physical-field finite element model simulation calculation module according to the vibration noise test result of the magnetic saturation type controllable reactor, performing the deep magnetic bias simulation test in the multi-physical-field finite element model simulation calculation module, and fitting the physical characteristics of the transformer to be tested under the wide-area magnetic bias according to the vibration noise test result and the deep magnetic bias simulation test result of the magnetic saturation type controllable reactor.
In the second step, the magnetic saturation type controllable reactor realizes continuous adjustment of the capacity by adjusting the saturation of the iron core material and changing the magnetic permeability of the iron core by means of the control part.
In the second step, the magnetic saturation type controllable reactor comprises a side yoke, an iron core column, a working winding and a control winding; wherein the control winding is wound around the limb outside and the working winding is located outside the control winding, i.e. the control winding is located between the limb and the working winding.
And thirdly, providing direct current by a control winding of the magnetic saturation type controllable reactor through a rectifier, gradually adjusting the direct current from 0 to the maximum, measuring voltage and current at a bus, measuring harmonic waves, and drawing a relation curve of the direct current and a primary side current value.
A transformer wide-area direct-current magnetic bias testing device based on a multi-element model comprises a magnetic saturation type controllable reactor, a magnetic bias control module and a multi-physical field finite element model simulation calculation module;
The magnetic saturation type controllable reactor comprises a side yoke, a control winding, a working winding and an iron core column, wherein a temperature sensor and a vibration sensor are embedded in the working winding and the iron core column;
The magnetic bias control module is used for controlling the magnetic saturation of the iron core column, so as to change the reactance value of the magnetic saturation type controllable reactor;
the vibration sensor is used for testing vibration noise of the magnetic saturation type controllable reactor under deep magnetic bias;
The multi-physical field finite element model simulation calculation module is used for carrying out a deep magnetic bias simulation test and fitting physical characteristics of the transformer to be tested under wide-area magnetic bias according to a vibration noise test result and a deep magnetic bias simulation test result of the magnetic saturation type controllable reactor.
The invention has the beneficial effects that: the state of the transformer under the deep bias of the transformer to be side is obtained through fitting of the magnetic saturation type controllable reactor, and the direct current bias magnetic energy testing method can be more scientific and systematic by combining the complement perfect data of the multi-physical field finite element model simulation calculation module.
Drawings
Fig. 1 is a schematic diagram of a magnetic saturation type controllable reactor.
Fig. 2 is a graph showing the relationship between the dc current and the primary current.
Fig. 3 is a graph of bias current versus noise.
Fig. 4 is an electrical schematic diagram of a magnetically saturated controllable reactor.
Fig. 5 is a simplified model of a small slope ideal magnetization curve.
Detailed Description
The invention is further illustrated below in connection with specific examples.
A transformer wide-area direct-current magnetic bias testing method based on a multivariate model comprises the following steps:
Step one, constructing a transformer wide-area magnetic bias testing device of a multi-element model, wherein the transformer wide-area magnetic bias testing device comprises a magnetic saturation type controllable reactor, a magnetic bias control module and a multi-physical field finite element model simulation calculation module;
Step two, acquiring the iron core size parameter of the transformer to be tested and the electromagnetic and mechanical characteristic parameters of the silicon steel sheet used, and constructing a multi-physical-field finite element model simulation calculation module of the transformer to be tested; the magnetic saturation type controllable reactor is adjusted according to the size proportion of the iron core;
Step three, adjusting a magnetic bias control module, and testing vibration noise of the magnetic saturation type controllable reactor under deep magnetic bias;
And fourthly, determining the adjustment model excitation and boundary conditions of the multi-physical-field finite element model simulation calculation module according to the vibration noise test result of the magnetic saturation type controllable reactor, performing the deep magnetic bias simulation test in the multi-physical-field finite element model simulation calculation module, and fitting the physical characteristics of the transformer to be tested under the wide-area magnetic bias according to the vibration noise test result and the deep magnetic bias simulation test result of the magnetic saturation type controllable reactor.
In the second step, the magnetic saturation type controllable reactor realizes continuous adjustment of the capacity by adjusting the saturation of the iron core material and changing the magnetic permeability of the iron core by means of the control part.
In the second step, the magnetic saturation type controllable reactor mainly comprises a side yoke 1, an iron core column 4, a working winding 3, a control winding 2 and the like; wherein the control winding 2 is wound outside the limb 4 and the working winding 3 is located outside the control winding 2, i.e. the control winding 2 is located between the limb 4 and the working winding 3. The structural dimension parameters and winding parameters of the magnetically-saturated controllable reactor are shown in the following tables 1 and 2.
TABLE 1 magnetic saturation type controllable reactor structural size
TABLE 2 magnetic saturation type controllable reactor winding parameters
In the third step, the control winding 2 of the magnetic saturation type controllable reactor provides direct current through a rectifier, the direct current is gradually regulated from 0to the maximum, the voltage and current at the 10kV bus are measured, the harmonic wave is measured, and a relation curve of the direct current and the primary current value is drawn, as shown in fig. 2. And D, increasing direct current to enable the iron core limb to gradually enter deep saturation, testing equivalent impedance Zr of the exciting winding, enabling the impedance to approach saturation, and testing the current value increase rate trend of the primary side. As can be seen from fig. 3, the change rules of vibration and noise are basically consistent, the change rules are rapidly increased along with the increase of the bias current, then gradually decreased along with the increase of the bias current, and then are stable.
A transformer wide-area direct-current magnetic bias testing device based on a multi-element model comprises a magnetic saturation type controllable reactor, a magnetic bias control module and a multi-physical field finite element model simulation calculation module;
The magnetic saturation type controllable reactor comprises a side yoke, a control winding, a working winding and an iron core column, wherein a temperature sensor and a vibration sensor are embedded in the working winding and the iron core column;
The magnetic bias control module is used for controlling the magnetic saturation of the iron core column, so as to change the reactance value of the magnetic saturation type controllable reactor;
the vibration sensor is used for testing vibration noise of the magnetic saturation type controllable reactor under deep magnetic bias;
The multi-physical field finite element model simulation calculation module is used for carrying out a deep magnetic bias simulation test and fitting physical characteristics of the transformer to be tested under wide-area magnetic bias according to a vibration noise test result and a deep magnetic bias simulation test result of the magnetic saturation type controllable reactor.
The magnetic saturation type controllable reactor utilizes the magnetic bias control module to control the saturation of the iron core column, thereby influencing the reactive power output of the magnetic saturation type controllable reactor to meet the voltage/reactive power requirements of a line/system.
As shown in fig. 4, the upper winding is a working winding, the lower winding is a control winding, N is the number of turns of the working winding, B 1 is the magnetic density of the core column of the magnetic saturation type controllable reactor, B 2 is the magnetic density of the side yoke of the magnetic saturation type controllable reactor, N k is the number of turns of the control winding, R k is the series impedance of the control loop, e=e m sin ωt, E is the transient electromotive force of the working winding, E m is the maximum value of the electromotive force of the working winding, ω is the angular electromotive force of the working power supply, t is time, i is the current flowing through the working winding, a b is the magnetic field strength of the core column of the magnetic saturation type controllable reactor, and when the control power supply E k is regulated, the magnetic state of the core column can be changed, so as to change the reactance value. The simplified small slope ideal magnetization curve model shown in fig. 5, where O is the origin of the coordinate system, B is the magnetic induction of the core, H is the magnetic field of the core, B s is the maximum value of the saturation magnetic density of the core, and-B s is the minimum value of the saturation magnetic density of the core. For a magnetically saturated controllable reactor, when the reactor works at idle, the core working point is close to the saturation state, and at the moment, the core can be pushed from the edge of the linear region to the core saturation region by only applying a small exciting current.
The self inductance L of the magnetically saturated controllable reactor can be expressed as:
；
wherein mu is magnetic permeability, N is the number of turns of the working winding, A is the sectional area of the iron core column, and l is the magnetic path length of the iron core column. As the saturation of the iron core column increases, the magnetic permeability mu decreases, the reactance value decreases, and the capacity Increase, wherein/>The reactance value is the reactance value, and U is the voltage.
The above examples are intended to be illustrative of the present invention and not limiting, and modifications may be made to the present embodiments by those skilled in the art without creative contribution to the present invention as required after reading the present specification, but are protected by patent laws within the scope of the appended claims.
Claims (2)
1. A transformer wide-area direct-current magnetic bias testing method based on a multivariate model is characterized by comprising the following steps:
Step one, constructing a transformer wide-area magnetic bias testing device of a multi-element model, wherein the transformer wide-area magnetic bias testing device comprises a magnetic saturation type controllable reactor, a magnetic bias control module and a multi-physical field finite element model simulation calculation module;
step two, acquiring the iron core size parameter of the transformer to be tested and the electromagnetic and mechanical characteristic parameters of the silicon steel sheet used, and constructing a multi-physical-field finite element model simulation calculation module of the transformer to be tested; the magnetic saturation type controllable reactor is adjusted according to the size proportion of the iron core; the magnetic saturation type controllable reactor realizes continuous adjustment of the capacity by adjusting the saturation of the iron core material and changing the magnetic permeability of the iron core by means of the control part; the magnetic saturation type controllable reactor comprises a side yoke, an iron core column, a working winding and a control winding; the control winding is wound outside the iron core limb, and the working winding is positioned outside the control winding, namely the control winding is positioned between the iron core limb and the working winding;
Step three, adjusting a magnetic bias control module, and testing vibration noise of the magnetic saturation type controllable reactor under deep magnetic bias; the control winding of the magnetic saturation type controllable reactor provides direct current through a rectifier, the direct current is gradually regulated from 0 to the maximum, the voltage and the current at the bus are measured, the harmonic is measured, and a relation curve of the direct current and the primary current value is drawn;
And fourthly, determining the adjustment model excitation and boundary conditions of the multi-physical-field finite element model simulation calculation module according to the vibration noise test result of the magnetic saturation type controllable reactor, performing the deep magnetic bias simulation test in the multi-physical-field finite element model simulation calculation module, and fitting the physical characteristics of the transformer to be tested under the wide-area magnetic bias according to the vibration noise test result and the deep magnetic bias simulation test result of the magnetic saturation type controllable reactor.
2. The device for the multi-element model-based transformer wide-area direct-current magnetic bias testing method of claim 1, which is characterized by comprising a magnetic saturation type controllable reactor, a magnetic bias control module and a multi-physical field finite element model simulation calculation module;
The magnetic saturation type controllable reactor comprises a side yoke, a control winding, a working winding and an iron core column, wherein a temperature sensor and a vibration sensor are embedded in the working winding and the iron core column;
The magnetic bias control module is used for controlling the magnetic saturation of the iron core column, so as to change the reactance value of the magnetic saturation type controllable reactor;
the vibration sensor is used for testing vibration noise of the magnetic saturation type controllable reactor under deep magnetic bias;
The multi-physical field finite element model simulation calculation module is used for carrying out a deep magnetic bias simulation test and fitting physical characteristics of the transformer to be tested under wide-area magnetic bias according to a vibration noise test result and a deep magnetic bias simulation test result of the magnetic saturation type controllable reactor.
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