CN112180177A - Power frequency electromagnetic field evaluation method and system fusing measured data - Google Patents
Power frequency electromagnetic field evaluation method and system fusing measured data Download PDFInfo
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- G01R29/08—Measuring electromagnetic field characteristics
Abstract
The application relates to a power frequency electromagnetic field evaluation method and system fusing measured data, relating to the technical field of power frequency electromagnetic field evaluation, and the method comprises the following steps: obtaining a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and permeability sub-thresholds; generating a plurality of material parameter combinations according to the plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and permeability sub-thresholds; obtaining theoretical electric field intensity and theoretical magnetic field intensity of each power frequency electromagnetic field measuring point through analog calculation; calculating the theoretical electric field intensity of each material parameter combination and the total intensity error of the theoretical magnetic field intensity, the actually measured electric field intensity and the actually measured magnetic field intensity; and obtaining the theoretical electric field intensity and the theoretical magnetic field intensity corresponding to the minimum value of the total intensity error, and judging the theoretical electric field intensity and the theoretical magnetic field intensity as the actual electric field intensity and the actual magnetic field intensity. According to the method, the simulation data and the real-time measurement data are compared, and the high-precision power frequency electromagnetic field distribution is gradually established, so that support is provided for electromagnetic shielding design and health protection.
Description
Technical Field
The invention relates to the technical field of power frequency electromagnetic field evaluation, in particular to a power frequency electromagnetic field evaluation method and system fusing measured data.
Background
On a marine platform, there is a high voltage transmission line, such as an ocean nuclear power platform, whose output voltages include 10.5KV and 35 KV. The high-voltage power transmission line can generate a strong power frequency electromagnetic field, can interfere high-precision electronic and electrical equipment to a certain extent, and can cause potential harm to human bodies exposed in the high-voltage power transmission line for a long time. Generally, a special shielding material, such as a composite material of stainless steel and permalloy, is wrapped around the high-voltage transmission line, so that a power frequency electromagnetic field generated by the high-voltage transmission line meets the marine standard, and the working performance of nearby electronic and electrical equipment and the human health of platform sea men are not affected. However, when the high-voltage transmission line works in a severe marine environment for a long time, the special shielding material wrapped by the high-voltage transmission line gradually generates an aging phenomenon, and the shielding effect is correspondingly deteriorated, so that the power frequency electromagnetic field of the high-voltage transmission line needs to be continuously and accurately monitored and evaluated, and the working performance of the electronic and electrical equipment and the human health of platform sea workers are guaranteed.
At present, the evaluation of the power frequency electromagnetic field generated by the high-voltage transmission line generally comprises two methods:
firstly, performing electromagnetic field numerical simulation analysis on the high-voltage transmission line based on Ansoft Maxwell electromagnetic field finite element analysis software based on the traditional electromagnetic field theory, wherein the input conditions comprise: the current voltage, the specific size and the spatial position of the high-voltage transmission line, the dielectric constant, the conductivity and the permeability of the electric lead, and the dielectric constant, the conductivity and the permeability of the shielding material special for the wrapping layer. With the long-term operation of a high-voltage transmission line in a severe marine environment, the special shielding material for the wrapping layer is gradually aged, the dielectric constant, the conductivity and the magnetic conductivity of the special shielding material cannot be directly measured, generally, the special shielding material is estimated based on experience, and certain errors exist, so that the distribution of a power frequency electromagnetic field based on Ansoft Maxwell electromagnetic field finite element analysis software is not accurate enough.
Secondly, according to a real-time measurement mode, a plurality of power frequency electromagnetic field measuring instruments are arranged in a cabin where the high-voltage transmission line is located, and power frequency electromagnetic field distribution is evaluated according to measurement results, but the arrangement number of the power frequency electromagnetic field measuring instruments in the cabin is limited, and the power frequency electromagnetic field near the high-voltage transmission line is difficult to accurately evaluate.
Therefore, in order to meet the use requirements at the present stage, a new power frequency electromagnetic field evaluation technical scheme is provided.
Disclosure of Invention
The embodiment of the application provides a power frequency electromagnetic field evaluation method and system fusing measured data, and high-precision power frequency electromagnetic field distribution is gradually established for a high-voltage power transmission line through comparison of software simulation data and real-time measurement data, so that support is provided for electromagnetic shielding design of electronic and electrical equipment of a cabin where the power frequency electromagnetic field distribution is located and health protection of working seamen.
In a first aspect, a power frequency electromagnetic field evaluation method fused with measured data is provided, the method comprising the following steps:
splitting a preset dielectric constant threshold range, a preset conductivity threshold range and a preset magnetic conductivity threshold range according to a preset splitting rule to obtain a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and magnetic conductivity sub-thresholds;
combining to generate a plurality of material parameter combinations based on a plurality of the permittivity sub-threshold, the conductivity sub-threshold and the permeability sub-threshold, a material parameter combination comprising one of the permittivity sub-threshold, one of the conductivity sub-threshold and one of the permeability sub-threshold;
according to the preset coordinate information of a plurality of power frequency electromagnetic field measuring points, combining each material parameter combination, and performing analog calculation to obtain the theoretical electric field intensity and the theoretical magnetic field intensity of each power frequency electromagnetic field measuring point corresponding to the material parameter combination;
selecting an evaluation time period, and calculating the theoretical electric field intensity and the total intensity error of the theoretical magnetic field intensity, the actually-measured electric field intensity and the actually-measured magnetic field intensity of each power frequency electromagnetic field measuring point of each material parameter combination;
and obtaining the theoretical electric field intensity and the theoretical magnetic field intensity corresponding to the minimum value of the total intensity error, and judging the theoretical electric field intensity and the theoretical magnetic field intensity as the actual electric field intensity and the actual magnetic field intensity.
Specifically, the calculating of the total intensity error of the theoretical electric field strength and the total intensity error of the theoretical magnetic field strength, the actually measured electric field strength, and the actually measured magnetic field strength of each power frequency electromagnetic field measurement point of each material parameter combination specifically includes the following steps:
calculating theoretical electric field intensity of each power frequency electromagnetic field measuring point of each material parameter combination and electric field total error of actually measured electric field intensity;
calculating the theoretical magnetic field intensity of each power frequency electromagnetic field measuring point of each material parameter combination and the total magnetic field error of the actually measured magnetic field intensity;
calculating to obtain the total error of the intensity corresponding to each material parameter combination according to the total error of the electric field and the total error of the magnetic field corresponding to each material parameter combination; wherein the content of the first and second substances,
the total error in intensity is the sum of the total error in the electric field and the total error in the magnetic field.
Specifically, according to a preset splitting rule, splitting a preset dielectric constant threshold range, a preset conductivity threshold range and a preset magnetic conductivity threshold range to obtain a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and magnetic conductivity sub-thresholds, specifically including the following steps:
setting a splitting constant n, and carrying out step-by-step splitting on the dielectric constant threshold range, the conductivity threshold range and the magnetic conductivity threshold range; wherein the content of the first and second substances,
a plurality of the dielectric constant sub-thresholds are respectivelya，
A plurality of conductivity sub-thresholds respectively σa，
A plurality of magnetic permeability sub-thresholds respectively of mua，
In particular, the material parameter combination exists (n +1)3And (4) a combination mode.
Specifically, the electric field total error calculation formula is as follows:
wherein, [ t ]a，tbThe actually measured electric field intensities of the k power frequency electromagnetic field measurement points are respectively E (x) in the evaluation time period corresponding to the total error of the electric field1,y1,z1,t)，E(x2,y2,z2,t)…E(xk,yk,zkT), the theoretical electric field intensities obtained by the k power frequency electromagnetic field measuring points through the material parameter combination simulation are respectively E' (x)1,y1,z1,t)，E′(x2,y2,z2,t)…E′(xk,yk,zk,t)。
Specifically, the total magnetic field error calculation formula is as follows:
wherein, [ t ]a，tbThe actually measured magnetic field intensity of the k power frequency electromagnetic field measuring points is respectively B (x) in the evaluation time period corresponding to the total error of the magnetic field1,y1,z1,t)，B(x2,y2,z2,t)…B(xk,yk,zkT), the theoretical magnetic field intensity obtained by the k power frequency electromagnetic field measuring points through the material parameter combination simulation is B' (x)1,y1,z1,t)，B′(x2,y2,z2,t)…B′(xk,yk,zk,t)。
Specifically, the calculation formula of the total error of the intensity is as follows:
Δ(ta～tb)＝ΔE(ta～tb)+ΔB(ta～tb)；
wherein, [ t ]a，tbThe total error of the electric field is delta, the total error of the magnetic field is the total error of the intensity, and the corresponding evaluation time period isE(ta～tb) Total error of said magnetic field is ΔB(ta～tb)。
In a second aspect, a power frequency electromagnetic field evaluation system fused with measured data is provided, the system comprising:
the parameter splitting unit is used for splitting a preset dielectric constant threshold range, a preset conductivity threshold range and a preset magnetic conductivity threshold range according to a preset splitting rule to obtain a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and magnetic conductivity sub-thresholds;
a parameter combination unit, configured to generate a plurality of material parameter combinations according to a plurality of the dielectric constant sub-threshold values, the conductivity sub-threshold values and the permeability sub-threshold values, wherein a material parameter combination includes one of the dielectric constant sub-threshold values, one of the conductivity sub-threshold values and one of the permeability sub-threshold values;
the theoretical intensity simulation unit is used for obtaining the theoretical electric field intensity and the theoretical magnetic field intensity of each power frequency electromagnetic field measuring point corresponding to each material parameter combination through simulation calculation according to the preset coordinate information of a plurality of power frequency electromagnetic field measuring points and by combining each material parameter combination;
the error calculation unit is used for selecting an evaluation time period, and calculating the theoretical electric field intensity and the theoretical magnetic field intensity of each power frequency electromagnetic field measuring point of each material parameter combination and the total intensity error of the actually-measured electric field intensity and the actually-measured magnetic field intensity;
and actual strength determination means for acquiring a theoretical electric field strength and a theoretical magnetic field strength corresponding to the minimum value of the total intensity error, and determining the theoretical electric field strength and the theoretical magnetic field strength as an actual electric field strength and an actual magnetic field strength.
Specifically, the electric field total error calculation formula is as follows:
wherein, [ t ]a，tbThe actually measured electric field intensities of the k power frequency electromagnetic field measurement points are respectively E (x) in the evaluation time period corresponding to the total error of the electric field1,y1,z1,t)，E(x2,y2,z2,t)…E(xk,yk,zkT), the theoretical electric field intensities obtained by the k power frequency electromagnetic field measuring points through the material parameter combination simulation are respectively E' (x)1,y1,z1,t)，E′(x2,y2,z2,t)…E′(xk,yk,zk,t)。
Specifically, the total magnetic field error calculation formula is as follows:
wherein, [ t ]a，tbThe actually measured magnetic field intensity of the k power frequency electromagnetic field measuring points is respectivelyB(x1,y1,z1,t)，B(x2,y2,z2,t)…B(xk,yk,zkT), the theoretical magnetic field intensity obtained by the k power frequency electromagnetic field measuring points through the material parameter combination simulation is B' (x)1,y1,z1,t)，B′(x2,y2,z2,t)…B′(xk,yk,zk,t)。
The beneficial effect that technical scheme that this application provided brought includes:
the application provides a power frequency electromagnetic field evaluation method and system fusing measured data, high-precision power frequency electromagnetic field distribution is gradually established for a high-voltage power transmission line through comparison of software simulation data and real-time measurement data, and support is provided for electromagnetic shielding design of electronic and electrical equipment of a cabin where the power frequency electromagnetic field distribution is located and health protection of working seafarers.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart illustrating steps of a power frequency electromagnetic field evaluation method for fusing measured data according to embodiment 1 of the present application;
FIG. 2 is a flowchart of steps A1-A3 in the power frequency electromagnetic field evaluation method for fusing measured data provided in embodiment 1 of the present application;
fig. 3 is a schematic distribution diagram of a power frequency electromagnetic field measuring instrument in the power frequency electromagnetic field evaluation method with fusion of actual measurement data provided in embodiment 1 of the present application;
FIG. 4 is a schematic flow chart of a power frequency electromagnetic field evaluation method for fusing measured data according to embodiment 1 of the present application;
fig. 5 is a block diagram of a power frequency electromagnetic field evaluation system that integrates measured data according to embodiment 2 of the present application;
reference numerals:
1. a parameter splitting unit; 2. a parameter combination unit; 3. a theoretical intensity simulation unit; 4. an error calculation unit; 5. and an actual intensity determination unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. 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 application.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The embodiment of the invention provides a power frequency electromagnetic field evaluation method and system fusing measured data, which gradually establishes high-precision power frequency electromagnetic field distribution for a high-voltage power transmission line by comparing software simulation data with real-time measurement data and provides support for electromagnetic shielding design of electronic and electrical equipment of a cabin and health protection of working seamen.
In order to achieve the technical effects, the general idea of the application is as follows:
a power frequency electromagnetic field evaluation method fusing measured data comprises the following steps:
s1, splitting a preset dielectric constant threshold range, a preset conductivity threshold range and a preset magnetic conductivity threshold range according to a preset splitting rule to obtain a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and magnetic conductivity sub-thresholds;
s2, generating a plurality of material parameter combinations according to the plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and permeability sub-thresholds, wherein one material parameter combination comprises one dielectric constant sub-threshold, one conductivity sub-threshold and one permeability sub-threshold;
s3, according to the preset coordinate information of a plurality of power frequency electromagnetic field measuring points, combining each material parameter combination, and performing simulation calculation to obtain the theoretical electric field intensity and the theoretical magnetic field intensity of each power frequency electromagnetic field measuring point corresponding to the material parameter combination;
s4, selecting an evaluation time period, and calculating the theoretical electric field intensity and the total error of the theoretical magnetic field intensity, the actual measured electric field intensity and the actual measured magnetic field intensity of each power frequency electromagnetic field measuring point of each material parameter combination;
s5, the theoretical electric field strength and the theoretical magnetic field strength corresponding to the minimum value of the total intensity error are acquired, and the actual electric field strength and the actual magnetic field strength are determined.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1 to 4, an embodiment of the present invention provides a power frequency electromagnetic field evaluation method fusing measured data, including the following steps:
s1, splitting a preset dielectric constant threshold range, a preset conductivity threshold range and a preset magnetic conductivity threshold range according to a preset splitting rule to obtain a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and magnetic conductivity sub-thresholds;
s2, generating a plurality of material parameter combinations according to the plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and permeability sub-thresholds, wherein one material parameter combination comprises one dielectric constant sub-threshold, one conductivity sub-threshold and one permeability sub-threshold;
s3, according to the preset coordinate information of a plurality of power frequency electromagnetic field measuring points, combining each material parameter combination, and performing simulation calculation to obtain the theoretical electric field intensity and the theoretical magnetic field intensity of each power frequency electromagnetic field measuring point corresponding to the material parameter combination;
s4, selecting an evaluation time period, and calculating the theoretical electric field intensity and the total error of the theoretical magnetic field intensity, the actual measured electric field intensity and the actual measured magnetic field intensity of each power frequency electromagnetic field measuring point of each material parameter combination;
s5, the theoretical electric field strength and the theoretical magnetic field strength corresponding to the minimum value of the total intensity error are acquired, and the actual electric field strength and the actual magnetic field strength are determined.
In the embodiment of the application, a corresponding coordinate system is established in a power frequency electromagnetic field area needing to be evaluated, a plurality of power frequency electromagnetic field measuring points are set, and each power frequency electromagnetic field measuring point is provided with a power frequency electromagnetic field measuring instrument.
It should be noted that the principle of the embodiment of the present application is as follows: splitting the dielectric constant threshold range, the conductivity threshold range and the permeability threshold range to obtain a plurality of material parameter combinations;
performing simulation calculation through software according to each material parameter combination to obtain corresponding theoretical electric field intensity and theoretical magnetic field intensity;
comparing each theoretical electric field intensity and each theoretical magnetic field intensity with an actually measured electric field intensity and an actually measured magnetic field intensity obtained by detection of the power frequency electromagnetic field measuring instrument;
and screening out the theoretical electric field intensity and the theoretical magnetic field intensity with the minimum total error of the actually measured electric field intensity and the actually measured magnetic field intensity, recording the corresponding material parameter combination as the optimal combination of the material parameters, and judging the theoretical electric field intensity and the theoretical magnetic field intensity as the actual electric field intensity and the actual magnetic field intensity.
In addition, when software simulation calculation is performed, Ansoft Maxwell electromagnetic field finite element analysis software can be specifically used, and other simulation calculation software can also be used.
First, in step S1, the embodiment of the present application may use Ansoft Maxwell electromagnetic field finite element analysis software, and for the Ansoft Maxwell electromagnetic field finite element analysis software, in terms of input, other input conditions (current and voltage, specific size and spatial position of the high voltage transmission line, and dielectric constant, conductivity and permeability of the electrical conductor of the high voltage transmission line) are generally not changed. However, as the high-voltage transmission line works in a severe marine environment for a long time, the shielding material dedicated for the wrapping layer gradually ages, and the dielectric constant, the conductivity σ and the permeability μ of the shielding material cannot be directly measured, but are estimated based on experience, thereby causing an error in output.
Specifically, the dielectric constant of the shielding material special for the wrapping layer of the high-voltage transmission line is defined, and the threshold value range is determined to be [a，b】；
Sigma is defined as the conductivity of the shielding material special for the wrapping layer of the high-voltage transmission line, and the threshold value range is determined to be [ sigma ] through aging test analysisa，σb】；
Mu is defined as the magnetic conductivity of the special shielding material for the wrapping layer of the high-voltage transmission line, and the threshold value range is determined to be [ mu ] through aging test analysisa，μb】。
Furthermore, according to a preset splitting rule, splitting the preset dielectric constant threshold range, conductivity threshold range and permeability threshold range to obtain a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and permeability sub-thresholds, specifically comprising the following steps:
setting a splitting constant n, and carrying out step-by-step splitting on the dielectric constant threshold range, the conductivity threshold range and the magnetic conductivity threshold range; wherein the content of the first and second substances,
a plurality of dielectric constant sub-thresholds respectivelya，
Multiple conductivity sub-thresholds respectively of σa，
Multiple magnetic permeability sub-thresholds of μa，
Further, in step S2, in generating a plurality of material parameter combinations by combining a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds, and permeability sub-thresholds, it should be noted that since there are n +1 dielectric constant sub-thresholds, conductivity sub-thresholds, and permeability sub-thresholds, a material parameter combination exists (n +1)3And (4) a combination mode.
The dielectric constant threshold range, the conductivity threshold range and the permeability threshold range are split, so that more accurate theoretical electric field strength and theoretical magnetic field strength can be simulated at a later stage, and a reliable data basis is provided for power frequency electromagnetic field evaluation.
Then, step S3 is performed, according to the coordinate information of the preset power frequency electromagnetic field measurement points, in combination with each material parameter combination, the theoretical electric field strength and the theoretical magnetic field strength of each power frequency electromagnetic field measurement point corresponding to the material parameter combination are obtained through simulation calculation, specifically (n +1)3Each input condition of the material parameter combination mode can be calculated according to Ansoft Maxwell electromagnetic field finite element analysis software to obtain the theoretical electric field intensity E' (x) of the position points of the k power frequency electromagnetic field measuring instruments1,y1,z1,t)，E′(x2,y2,z2,t)…E′(xk,yk,zkT) and the theoretical magnetic field strength B' (x)1,y1,z1,t)，B′(x2,y2,z2,t)…B′(xk,yk,zk,t)；
And each power frequency electromagnetic field measuring point is provided with a power frequency electromagnetic field measuring instrument, so that the coordinate information of each power frequency electromagnetic field measuring point is respectively the same as the coordinate information of the position point of the corresponding power frequency electromagnetic field measuring instrument.
Simultaneously, a power frequency electromagnetic field measuring instrument is utilized to measure the actually measured electric field intensity and the actually measured magnetic field intensity of each power frequency electromagnetic field measuring point and the actually measured electric field intensity of each k power frequency electromagnetic field measuring pointsDegree is respectively E (x)1,y1,z1,t)，E(x2,y2,z2,t)…E(xk,yk,zkT) and each measured magnetic field intensity is B (x)1,y1,z1,t)，B(x2,y2,z2,t)…B(xk,yk,zk,t)。
Then, in step S4, the total electric field error between the theoretical electric field strength and the measured electric field strength is calculated, and the total magnetic field error between the theoretical magnetic field strength and the measured magnetic field strength is calculated.
According to the embodiment of the application, high-precision power frequency electromagnetic field distribution is gradually established for the high-voltage transmission line by comparing software simulation data with real-time measurement data, and support is provided for electromagnetic shielding design of electronic and electrical equipment of a cabin and health protection of working seamen.
Specifically, the method for calculating the theoretical electric field strength and the total intensity error of the theoretical magnetic field strength, the actually measured electric field strength and the actually measured magnetic field strength of each power frequency electromagnetic field measuring point of each material parameter combination specifically comprises the following steps:
a1, calculating theoretical electric field intensity of each power frequency electromagnetic field measuring point of each material parameter combination and electric field total error of actually measured electric field intensity;
a2, calculating theoretical magnetic field intensity of each power frequency electromagnetic field measuring point of each material parameter combination and magnetic field total error of actually measured magnetic field intensity;
a3, calculating to obtain the total error of intensity corresponding to each material parameter combination according to the total error of the electric field and the total error of the magnetic field corresponding to each material parameter combination; wherein the content of the first and second substances,
the total error in intensity is the sum of the total error in the electric field and the total error in the magnetic field.
Specifically, the electric field total error calculation formula is as follows:
wherein, [ t ]a，tbEvaluation for total error of electric fieldEstimating time period, wherein the actually measured electric field intensity of k power frequency electromagnetic field measurement points is respectively E (x)1,y1,z1,t)，E(x2,y2,z2,t)…E(xk,yk,zkT) and the theoretical electric field intensity obtained by simulating the k power frequency electromagnetic field measurement points according to the material parameter combination is respectively E' (x)1,y1,z1,t)，E′(x2,y2,z2,t)…E′(xk,yk,zk,t)。
Specifically, the total magnetic field error calculation formula is as follows:
wherein, [ t ]a，tbThe actually measured magnetic field intensity of k power frequency electromagnetic field measurement points is B (x) respectively in an evaluation time period corresponding to the total error of the magnetic field1,y1,z1,t)，B(x2,y2,z2,t)…B(xk,yk,zkT) and the theoretical magnetic field intensity obtained by simulating the k power frequency electromagnetic field measuring points according to the material parameter combination is B' (x)1,y1,z1,t)，B′(x2,y2,z2,t)…B′(xk,yk,zk,t)。
Specifically, the calculation formula of the total error of the intensity is as follows:
Δ(ta～tb)＝ΔE(ta～tb)+ΔB(ta～tb)；
wherein, [ t ]a，tbThe total error of electric field is ΔE(ta～tb) Total error of magnetic field of ΔB(ta～tb)。
Thus, a certain period of time [ t ]a，tbAimed at (n +1)3The theory power frequency electromagnetic field calculated by software is (n +1)3Total error of species delta (t)a～tb). Determining the total error delta (t) using a minimum comparatora～tb) The minimum value of (a) corresponds to the material parameter combination (dielectric constant) of the shielding material specific for the wrapping layerzConductivity σzAnd magnetic permeability muz) The combination is used as an input condition, a theoretical power frequency electromagnetic field calculated by Ansoft Maxwell electromagnetic field finite element analysis software is a high-precision power frequency electromagnetic field in the period, and the combination can better fit with the actual measurement condition;
based on the high-precision power frequency electromagnetic field, the electromagnetic shielding device can effectively provide guidance for electromagnetic shielding design of electronic and electrical equipment in a cabin where the high-voltage transmission line is located and health protection of working seafarers.
Example 2
Referring to fig. 5, an embodiment of the present invention provides a power frequency electromagnetic field evaluation system based on fused measured data in embodiment 1, where the system includes:
the parameter splitting unit 1 is configured to split a preset dielectric constant threshold range, a preset conductivity threshold range and a preset magnetic conductivity threshold range according to a preset splitting rule to obtain a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and magnetic conductivity sub-thresholds;
a parameter combination unit 2, configured to generate a plurality of material parameter combinations according to a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and permeability sub-thresholds, where a material parameter combination includes a dielectric constant sub-threshold, a conductivity sub-threshold and a permeability sub-threshold;
the theoretical intensity simulation unit 3 is used for obtaining the theoretical electric field intensity and the theoretical magnetic field intensity of each power frequency electromagnetic field measuring point corresponding to the material parameter combination through simulation calculation according to the preset coordinate information of a plurality of power frequency electromagnetic field measuring points and by combining each material parameter combination;
the error calculation unit 4 is used for selecting an evaluation time period and calculating the theoretical electric field intensity and the total error of the theoretical magnetic field intensity, the actual measured electric field intensity and the actual measured magnetic field intensity of each power frequency electromagnetic field measuring point of each material parameter combination;
and an actual strength determination unit 5 for acquiring a theoretical electric field strength and a theoretical magnetic field strength corresponding to the minimum value of the total intensity error and determining the theoretical electric field strength and the theoretical magnetic field strength as an actual electric field strength and an actual magnetic field strength.
In the embodiment of the application, a corresponding coordinate system is established in a power frequency electromagnetic field area needing to be evaluated, a plurality of power frequency electromagnetic field measuring points are set, and each power frequency electromagnetic field measuring point is provided with a power frequency electromagnetic field measuring instrument.
It should be noted that the principle of the embodiment of the present application is as follows: splitting the dielectric constant threshold range, the conductivity threshold range and the permeability threshold range to obtain a plurality of material parameter combinations;
performing simulation calculation through software according to each material parameter combination to obtain corresponding theoretical electric field intensity and theoretical magnetic field intensity;
comparing each theoretical electric field intensity and each theoretical magnetic field intensity with an actually measured electric field intensity and an actually measured magnetic field intensity obtained by detection of the power frequency electromagnetic field measuring instrument;
and screening out the theoretical electric field intensity and the theoretical magnetic field intensity with the minimum total error of the actually measured electric field intensity and the actually measured magnetic field intensity, recording the corresponding material parameter combination as the optimal combination of the material parameters, and judging the theoretical electric field intensity and the theoretical magnetic field intensity as the actual electric field intensity and the actual magnetic field intensity.
In addition, when software simulation calculation is performed, Ansoft Maxwell electromagnetic field finite element analysis software can be specifically used, and other simulation calculation software can also be used.
Firstly, the embodiment of the application can utilize Ansoft Maxwell electromagnetic field finite element analysis software, and aiming at the Ansoft Maxwell electromagnetic field finite element analysis software, in the aspect of input, other input conditions (current and voltage, specific size and spatial position of a high-voltage transmission line, and dielectric constant, conductivity and magnetic permeability of an electric conductor of the high-voltage transmission line) are not changed generally. However, as the high-voltage transmission line works in a severe marine environment for a long time, the shielding material dedicated for the wrapping layer gradually ages, and the dielectric constant, the conductivity σ and the permeability μ of the shielding material cannot be directly measured, but are estimated based on experience, thereby causing an error in output.
Specifically, the dielectric constant of the shielding material special for the wrapping layer of the high-voltage transmission line is defined, and the threshold value range is determined to be [a，b】；
Sigma is defined as the conductivity of the shielding material special for the wrapping layer of the high-voltage transmission line, and the threshold value range is determined to be [ sigma ] through aging test analysisa，σb】；
Mu is defined as the magnetic conductivity of the special shielding material for the wrapping layer of the high-voltage transmission line, and the threshold value range is determined to be [ mu ] through aging test analysisa，μb】。
Furthermore, according to a preset splitting rule, splitting the preset dielectric constant threshold range, conductivity threshold range and permeability threshold range to obtain a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and permeability sub-thresholds, specifically comprising the following steps:
setting a splitting constant n, and carrying out step-by-step splitting on the dielectric constant threshold range, the conductivity threshold range and the magnetic conductivity threshold range; wherein the content of the first and second substances,
a plurality of dielectric constant sub-thresholds respectivelya，
Multiple conductivity sub-thresholds respectively of σa，
A plurality ofMagnetic permeability sub-threshold of μa，
Further, in generating a plurality of material parameter combinations by combining a plurality of permittivity sub-threshold values, conductivity sub-threshold values, and permeability sub-threshold values, it should be noted that since there are n +1 permittivity sub-threshold values, conductivity sub-threshold values, and permeability sub-threshold values, a material parameter combination exists (n +1)3And (4) a combination mode.
The dielectric constant threshold range, the conductivity threshold range and the permeability threshold range are split, so that more accurate theoretical electric field strength and theoretical magnetic field strength can be simulated at a later stage, and a reliable data basis is provided for power frequency electromagnetic field evaluation.
Then, according to the preset coordinate information of a plurality of power frequency electromagnetic field measuring points, combining with each material parameter combination, and performing analog calculation to obtain the theoretical electric field intensity and the theoretical magnetic field intensity of each power frequency electromagnetic field measuring point corresponding to the material parameter combination, specifically (n +1)3Each input condition of the material parameter combination mode can be calculated according to Ansoft Maxwell electromagnetic field finite element analysis software to obtain the theoretical electric field intensity E' (x) of the position points of the k power frequency electromagnetic field measuring instruments1,y1,z1,t)，E′(x2,y2,z2,t)…E′(xk,yk,zkT) and the theoretical magnetic field strength B' (x)1,y1,z1,t)，B′(x2,y2,z2,t)…B′(xk,yk,zk,t)；
And each power frequency electromagnetic field measuring point is provided with a power frequency electromagnetic field measuring instrument, so that the coordinate information of each power frequency electromagnetic field measuring point is respectively the same as the coordinate information of the position point of the corresponding power frequency electromagnetic field measuring instrument.
At the same time, the power frequency electromagnetic field measuring instrument is used for measuringMeasuring the actually measured electric field intensity and the actually measured magnetic field intensity of each power frequency electromagnetic field measuring point, wherein the actually measured electric field intensity of each k power frequency electromagnetic field measuring points is respectively E (x)1,y1,z1,t)，E(x2,y2,z2,t)…E(xk,yk,zkT) and each measured magnetic field intensity is B (x)1,y1,z1,t)，B(x2,y2,z2,t)…B(xk,yk,zk,t)。
And then, calculating the total error of the electric field of the theoretical electric field intensity and the actual measured electric field intensity, and calculating the total error of the magnetic field of the theoretical magnetic field intensity and the actual measured magnetic field intensity.
According to the embodiment of the application, high-precision power frequency electromagnetic field distribution is gradually established for the high-voltage transmission line by comparing software simulation data with real-time measurement data, and support is provided for electromagnetic shielding design of electronic and electrical equipment of a cabin and health protection of working seamen.
Specifically, in the error calculation unit 4, the theoretical electric field strength and the theoretical magnetic field strength of each power frequency electromagnetic field measurement point of each material parameter combination, the actually measured electric field strength, and the actually measured magnetic field strength are calculated, and the method specifically includes the following steps:
a1, calculating theoretical electric field intensity of each power frequency electromagnetic field measuring point of each material parameter combination and electric field total error of actually measured electric field intensity;
a2, calculating theoretical magnetic field intensity of each power frequency electromagnetic field measuring point of each material parameter combination and magnetic field total error of actually measured magnetic field intensity;
a3, calculating to obtain the total error of intensity corresponding to each material parameter combination according to the total error of the electric field and the total error of the magnetic field corresponding to each material parameter combination; wherein the content of the first and second substances,
the total error in intensity is the sum of the total error in the electric field and the total error in the magnetic field.
Specifically, the electric field total error calculation formula is as follows:
wherein, [ t ]a，tbThe actually measured electric field intensities of the k power frequency electromagnetic field measurement points are respectively E (x) in the evaluation time period corresponding to the total error of the electric field1,y1,z1,t)，E(x2,y2,z2,t)…E(xk,yk,zkT) and the theoretical electric field intensity obtained by simulating the k power frequency electromagnetic field measurement points according to the material parameter combination is respectively E' (x)1,y1,z1,t)，E′(x2,y2,z2,t)…E′(xk,yk,zk,t)。
Specifically, the total magnetic field error calculation formula is as follows:
wherein, [ t ]a，tbThe actually measured magnetic field intensity of k power frequency electromagnetic field measurement points is B (x) respectively in an evaluation time period corresponding to the total error of the magnetic field1,y1,z1,t)，B(x2,y2,z2,t)…B(xk,yk,zkT) and the theoretical magnetic field intensity obtained by simulating the k power frequency electromagnetic field measuring points according to the material parameter combination is B' (x)1,y1,z1,t)，B′(x2,y2,z2,t)…B′(xk,yk,zk,t)。
Specifically, the calculation formula of the total error of the intensity is as follows:
Δ(ta～tb)＝ΔE(ta～tb)+ΔB(ta～tb)；
wherein, [ t ]a，tbThe total error of electric field is ΔE(ta～tb) Total error of magnetic field of ΔB(ta～tb)。
Therefore, the temperature of the molten metal is controlled,a certain period of time ta，tbAimed at (n +1)3The theory power frequency electromagnetic field calculated by software is (n +1)3Total error of species delta (t)a～tb). Determining the total error delta (t) using a minimum comparatora～tb) The minimum value of (a) corresponds to the material parameter combination (dielectric constant) of the shielding material specific for the wrapping layerzConductivity σzAnd magnetic permeability muz) The combination is used as an input condition, a theoretical power frequency electromagnetic field calculated by Ansoft Maxwell electromagnetic field finite element analysis software is a high-precision power frequency electromagnetic field in the period, and the combination can better fit with the actual measurement condition;
based on the high-precision power frequency electromagnetic field, the electromagnetic shielding device can effectively provide guidance for electromagnetic shielding design of electronic and electrical equipment in a cabin where the high-voltage transmission line is located and health protection of working seafarers.
It should be noted that in the present application, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A power frequency electromagnetic field evaluation method fused with measured data is characterized by comprising the following steps:
splitting a preset dielectric constant threshold range, a preset conductivity threshold range and a preset magnetic conductivity threshold range according to a preset splitting rule to obtain a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and magnetic conductivity sub-thresholds;
combining to generate a plurality of material parameter combinations based on a plurality of the permittivity sub-threshold, the conductivity sub-threshold and the permeability sub-threshold, a material parameter combination comprising one of the permittivity sub-threshold, one of the conductivity sub-threshold and one of the permeability sub-threshold;
according to the preset coordinate information of a plurality of power frequency electromagnetic field measuring points, combining each material parameter combination, and performing analog calculation to obtain the theoretical electric field intensity and the theoretical magnetic field intensity of each power frequency electromagnetic field measuring point corresponding to the material parameter combination;
selecting an evaluation time period, and calculating the theoretical electric field intensity and the total intensity error of the theoretical magnetic field intensity, the actually-measured electric field intensity and the actually-measured magnetic field intensity of each power frequency electromagnetic field measuring point of each material parameter combination;
and obtaining the theoretical electric field intensity and the theoretical magnetic field intensity corresponding to the minimum value of the total intensity error, and judging the theoretical electric field intensity and the theoretical magnetic field intensity as the actual electric field intensity and the actual magnetic field intensity.
2. The power frequency electromagnetic field evaluation method fused with actual measurement data as claimed in claim 1, wherein the calculation of the total error of the theoretical electric field strength and the total error of the theoretical magnetic field strength and the actual measured electric field strength and the actual measured magnetic field strength of each power frequency electromagnetic field measurement point of each material parameter combination specifically comprises the following steps:
calculating theoretical electric field intensity of each power frequency electromagnetic field measuring point of each material parameter combination and electric field total error of actually measured electric field intensity;
calculating the theoretical magnetic field intensity of each power frequency electromagnetic field measuring point of each material parameter combination and the total magnetic field error of the actually measured magnetic field intensity;
calculating to obtain the total error of the intensity corresponding to each material parameter combination according to the total error of the electric field and the total error of the magnetic field corresponding to each material parameter combination; wherein the content of the first and second substances,
the total error in intensity is the sum of the total error in the electric field and the total error in the magnetic field.
3. The power frequency electromagnetic field evaluation method for fusing measured data according to claim 1, wherein the splitting processing is performed on a preset dielectric constant threshold range, a preset conductivity threshold range and a preset permeability threshold range according to a preset splitting rule to obtain a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and permeability sub-thresholds, and the method specifically comprises the following steps:
setting a splitting constant n, and carrying out step-by-step splitting on the dielectric constant threshold range, the conductivity threshold range and the magnetic conductivity threshold range; wherein the content of the first and second substances,
a plurality of the dielectric constant sub-thresholds are respectivelya，
A plurality of conductivity sub-thresholds respectively σa，
A plurality of magnetic permeability sub-thresholds respectively of mua，
4. The power frequency electromagnetic field evaluation method for fusing measured data according to claim 3, characterized in that:
the material parameter combination exists (n +1)3And (4) a combination mode.
5. The power frequency electromagnetic field evaluation method for fusing measured data according to claim 1, wherein the total error of the electric field is calculated by the following formula:
wherein, [ t ]a，tbThe actually measured electric field intensities of the k power frequency electromagnetic field measurement points are respectively E (x) in the evaluation time period corresponding to the total error of the electric field1,y1,z1,t)，E(x2,y2,z2,t)…E(xk,yk,zkT), the theoretical electric field intensities obtained by the k power frequency electromagnetic field measuring points through the material parameter combination simulation are respectively E' (x)1,y1,z1,t)，E′(x2,y2,z2,t)…E′(xk,yk,zk,t)。
6. The power frequency electromagnetic field evaluation method for fusing measured data according to claim 1, wherein the total magnetic field error calculation formula is:
wherein, [ t ]a，tbThe actually measured magnetic field intensity of the k power frequency electromagnetic field measuring points is respectively B (x) in the evaluation time period corresponding to the total error of the magnetic field1,y1,z1,t)，B(x2,y2,z2,t)…B(xk,yk,zkT), the theoretical magnetic field intensity obtained by the k power frequency electromagnetic field measuring points through the material parameter combination simulation is B' (x)1,y1,z1,t)，B′(x2,y2,z2,t)…B′(xk,yk,zk,t)。
7. The power frequency electromagnetic field evaluation method for fusing measured data according to claim 1, wherein the calculation formula of the total intensity error is as follows:
Δ(ta～tb)＝ΔE(ta～tb)+ΔB(ta～tb)；
wherein, [ t ]a，tbThe total error of the electric field is delta, the total error of the magnetic field is the total error of the intensity, and the corresponding evaluation time period isE(ta～tb) Total error of said magnetic field is ΔB(ta～tb)。
8. A power frequency electromagnetic field evaluation system fusing measured data is characterized by comprising:
the parameter splitting unit is used for splitting a preset dielectric constant threshold range, a preset conductivity threshold range and a preset magnetic conductivity threshold range according to a preset splitting rule to obtain a plurality of dielectric constant sub-thresholds, conductivity sub-thresholds and magnetic conductivity sub-thresholds;
a parameter combination unit, configured to generate a plurality of material parameter combinations according to a plurality of the dielectric constant sub-threshold values, the conductivity sub-threshold values and the permeability sub-threshold values, wherein a material parameter combination includes one of the dielectric constant sub-threshold values, one of the conductivity sub-threshold values and one of the permeability sub-threshold values;
the theoretical intensity simulation unit is used for obtaining the theoretical electric field intensity and the theoretical magnetic field intensity of each power frequency electromagnetic field measuring point corresponding to each material parameter combination through simulation calculation according to the preset coordinate information of a plurality of power frequency electromagnetic field measuring points and by combining each material parameter combination;
the error calculation unit is used for selecting an evaluation time period and calculating the theoretical electric field intensity and the total intensity error of the theoretical magnetic field intensity, the actually-measured electric field intensity and the actually-measured magnetic field intensity of each power frequency electromagnetic field measuring point of each material parameter combination;
and actual strength determination means for acquiring a theoretical electric field strength and a theoretical magnetic field strength corresponding to the minimum value of the total intensity error, and determining the theoretical electric field strength and the theoretical magnetic field strength as an actual electric field strength and an actual magnetic field strength.
9. The power frequency electromagnetic field evaluation system for fusing measured data according to claim 8, wherein the total error of electric field calculation formula is:
wherein, [ t ]a，tbThe actually measured electric field intensities of the k power frequency electromagnetic field measurement points are respectively E (x) in the evaluation time period corresponding to the total error of the electric field1,y1,z1,t)，E(x2,y2,z2,t)…E(xk,yk,zkT), the theoretical electric field intensities obtained by the k power frequency electromagnetic field measuring points through the material parameter combination simulation are respectively E' (x)1,y1,z1,t)，E′(x2,y2,z2,t)…E′(xk,yk,zk,t)。
10. The power frequency electromagnetic field evaluation system with fusion of measured data of claim 7, wherein the total error of magnetic field calculation formula is:
wherein, [ t ]a，tbThe actually measured magnetic field intensity of the k power frequency electromagnetic field measuring points is respectively B (x) in the evaluation time period corresponding to the total error of the magnetic field1,y1,z1,t)，B(x2,y2,z2,t)…B(xk,yk,zkT), the theoretical magnetic field intensity obtained by the k power frequency electromagnetic field measuring points through the material parameter combination simulation is B' (x)1,y1,z1,t)，B′(x2,y2,z2,t)…B′(xk,yk,zk,t)。
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