Converter valve response surface model construction method, field intensity calculation method and system

Abstract

The invention relates to a converter valve response surface model construction method and a field intensity calculation method and system. According to the converter valve response surface model construction method, observation surfaces of a to-be-tested converter valve under a plurality of different distance values are obtained, the field intensity of each observation surface is simulated, a plane field intensity simulation result corresponding to each observation surface is obtained, a snapshot matrix of the to-be-tested converter valve is constructed based on the plurality of plane field intensity simulation results, and a response surface model of the to-be-tested converter valve is constructed. The method comprises the following steps: performing modal decomposition on a snapshot matrix of a to-be-tested converter valve by using singular value decomposition and intrinsic orthogonal decomposition to obtain a modal coefficient matrix, quickly constructing a response surface model based on the modal coefficient matrix and a plurality of different distance values, and obtaining a response surface model through the constructed response surface model. According to the method, the plane field intensity value under any converter valve distance in the observation area can be rapidly calculated, the field intensity of the whole observation area can be rapidly calculated within a certain precision allowable range, the selected field intensity value of any plane does not need to be simulated again, the calculation time is shortened, and the working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of DC converter valves, and specifically relates to a method for constructing a response surface model of a converter valve, a method for calculating field strength, and a system. Background Art

[0002] The electromagnetic interference and electromagnetic environment problems of converter valves have been increasingly concerned. Establishing an antenna model of the converter valve equipment in a DC conversion system is of great significance for accurately simulating the characteristics of electromagnetic sources and analyzing the spatial electromagnetic distribution law. However, when solving the antenna model of the converter valve, due to the complex structure and large scale of the converter valve, the number of grid cells divided during the solution is too large, resulting in a very long calculation time. Summary of the Invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a method for constructing a response surface model of a converter valve, and the method includes:

[0004] Obtain observation surfaces of the converter valve to be measured at multiple different distance values, and each observation surface includes multiple observation points;

[0005] Simulate the field strength of each observation surface to obtain a plane field strength simulation result corresponding to each observation surface, and each plane field strength simulation result includes simulation field strength values of multiple observation points;

[0006] Based on multiple plane field strength simulation results, construct a snapshot matrix of the converter valve to be measured, and each element in the snapshot matrix represents the simulation field strength value of an observation point in an observation surface;

[0007] Perform modal decomposition on the snapshot matrix of the converter valve to be measured by using singular value decomposition and proper orthogonal decomposition to obtain a modal coefficient matrix;

[0008] Based on the modal coefficient matrix and the multiple different distance values, construct a response surface model corresponding to the modal coefficient matrix and the distance value.

[0009] Optionally, the performing modal decomposition on the snapshot matrix of the converter valve to be measured by using singular value decomposition and proper orthogonal decomposition to obtain a modal coefficient matrix includes:

[0010] Perform singular value decomposition on the snapshot matrix of the converter valve to be measured to obtain a singular value matrix including the eigenvalues of the snapshot matrix;

[0011] Based on the singular value matrix, perform modal decomposition by using proper orthogonal decomposition to obtain a modal coefficient matrix.

[0012] Optionally, the based on the singular value matrix, performing modal decomposition by using proper orthogonal decomposition to obtain a modal coefficient matrix includes:

[0013] Based on the singular value matrix, select multiple eigenvalues from the singular value matrix by using the eigenvalue selection inequality in proper orthogonal decomposition;

[0014] Based on the multiple eigenvalues and the eigenvectors corresponding to each eigenvalue, construct a modal coefficient matrix.

[0015] Optionally, the calculation method of the eigenvalue selection inequality includes:

[0016] Based on the selection limit value and the eigenvalues in the singular value matrix, obtain the eigenvalue selection inequality.

[0017] Optionally, the calculation method of the eigenvalue selection inequality is the following formula:

[0018]

[0019] where ε is the selection limit value, σ i is the i-th eigenvalue from large to small in the singular value matrix, d is the number of eigenvalues, n is the number of eigenvalues in the singular value matrix, and d is less than n.

[0020] Optionally, the construction of the snapshot matrix of the converter valve under test based on multiple plane field strength simulation results includes:

[0021] Use the simulated field strength values of multiple observation points in each plane field strength simulation result as the elements of any row vector in the snapshot matrix;

[0022] Arrange the multiple row vectors in the snapshot matrix to obtain the snapshot matrix of the converter valve under test.

[0023] Optionally, the construction of the response surface model corresponding to the modal coefficient matrix and the distance value based on the modal coefficient matrix and the multiple different distance values includes:

[0024] Based on the modal coefficient matrix, multiple different distance values, the response surface coefficient matrix, and the selected radial basis function matrix, obtain the functional relationship corresponding to the modal coefficient matrix and the distance value;

[0025] Use the functional relationship corresponding to the modal coefficient matrix and the distance value as the response surface model corresponding to the modal coefficient matrix and the distance value.

[0026] Optionally, the functional relationship corresponding to the modal coefficient matrix and the distance value satisfies the following calculation formula:

[0027] α T (x) = φ(||x - x i ||)λ + Gβ

[0028] Wherein, λ is the response surface coefficient matrix, φ is the selected radial basis function matrix, x is the distance value in the functional relationship, and x i is the i-th distance value, G(x) is the matrix composed of the powers of x, and each row of x is arranged from the 0th power to the pth power, that is β is the coefficient matrix, and α T (x) is the functional relationship corresponding to the modal coefficient matrix and the distance value, and T represents the matrix transpose.

[0029] Optionally, the obtaining of the observation surfaces of the converter valve to be measured at multiple different distance values includes:

[0030] Establish a three-dimensional coordinate system with the converter valve to be measured as the origin, and take multiple different distance values in any coordinate axis direction outside the converter valve to be measured;

[0031] Take the two-dimensional plane perpendicular to the coordinate axis corresponding to each different distance value as the observation surface, and obtain the observation surfaces at each different distance value.

[0032] Based on the same inventive concept, the present invention also provides a response surface model construction system for a converter valve, and the system includes:

[0033] An observation surface acquisition unit for acquiring the observation surfaces of the converter valve to be measured at multiple different distance values, and each observation surface includes multiple observation points;

[0034] A simulation result determination unit for simulating the field strength of each observation surface to obtain the plane field strength simulation result corresponding to each observation surface, and each plane field strength simulation result includes the simulated field strength values of multiple observation points;

[0035] A snapshot matrix construction unit for constructing the snapshot matrix of the converter valve to be measured based on multiple plane field strength simulation results, and each element in the snapshot matrix respectively represents the simulated field strength value of an observation point in an observation surface;

[0036] A modal coefficient matrix determination unit for performing modal decomposition on the snapshot matrix of the converter valve to be measured by using singular value decomposition and proper orthogonal decomposition to obtain the modal coefficient matrix;

[0037] A response surface model construction unit for constructing a response surface model corresponding to the modal coefficient matrix and the distance value based on the modal coefficient matrix and the multiple different distance values.

[0038] Optionally, the modal coefficient matrix determination unit includes:

[0039] A singular value matrix determination module for performing singular value decomposition on the snapshot matrix of the converter valve to be measured to obtain a singular value matrix including the eigenvalues of the snapshot matrix;

[0040] The modal coefficient matrix determination module is used to perform modal decomposition on the basis of the singular value matrix by using proper orthogonal decomposition to obtain the modal coefficient matrix.

[0041] Optionally, the modal coefficient matrix determination module is specifically configured to:

[0042] Based on the singular value matrix, select a plurality of eigenvalues from the singular value matrix by using the eigenvalue selection inequality in proper orthogonal decomposition;

[0043] Based on the plurality of eigenvalues and the eigenvectors corresponding to each eigenvalue, construct a modal coefficient matrix.

[0044] Optionally, the system further includes an inequality determination unit for determining the selection inequality. The selection inequality calculation unit is used to:

[0045] Based on the selection limit value and the eigenvalues in the singular value matrix, obtain the eigenvalue selection inequality.

[0046] Optionally, the calculation method of the eigenvalue selection inequality is the following formula:

[0047]

[0048] where ε is the selection limit value, σ i is the i-th eigenvalue from large to small in the singular value matrix, d is the number of eigenvalues, n is the number of eigenvalues in the singular value matrix, and d is less than n.

[0049] Optionally, the snapshot matrix construction unit is specifically configured to:

[0050] Take the simulation field strength values of multiple observation points in each planar field strength simulation result as the elements of any row vector in the snapshot matrix;

[0051] Arrange the multiple row vectors in the snapshot matrix to obtain the snapshot matrix of the converter valve to be measured.

[0052] Optionally, the response surface model construction unit is specifically configured to:

[0053] Based on the modal coefficient matrix, a plurality of different distance values, the response surface coefficient matrix, and the selected radial basis function matrix, obtain the functional relationship between the modal coefficient matrix and the distance value;

[0054] Take the functional relationship between the modal coefficient matrix and the distance value as the response surface model between the modal coefficient matrix and the distance value.

[0055] Optionally, the functional relationship between the modal coefficient matrix and the distance value satisfies the following calculation formula:

[0056] αT f(x) = φ(||x - x i ||)λ + Gβ

[0057] Where λ is the response surface coefficient matrix, φ is the selected radial basis function matrix, x is the distance value in the functional relationship, and x i is the i-th distance value, G(x) is the matrix composed of the powers of x, and each row of x is arranged from the 0-th power to the p-th power, that is β is the coefficient matrix, and α T f(x) is the functional relationship corresponding to the modal coefficient matrix and the distance value, and T represents the matrix transpose.

[0058] Optionally, the observation surface acquisition unit is specifically configured to:

[0059] Establish a three-dimensional coordinate system with the to-be-tested converter valve as the origin, and take multiple different distance values in any axis direction outside the to-be-tested converter valve;

[0060] Take the two-dimensional plane perpendicular to the coordinate axis corresponding to each different distance value as the observation surface, and obtain the observation surface at each different distance value.

[0061] Based on the same inventive concept, the present invention also provides a field strength calculation method, and the method includes:

[0062] Obtain the current distance value of the to-be-tested converter valve;

[0063] Based on the current distance value, use the response surface model constructed by the response surface model construction method of the converter valve according to any one of claims 1-8 above to obtain the modal coefficient matrix corresponding to the current distance value;

[0064] Based on the modal coefficient matrix corresponding to the current distance value, use the correspondence between the snapshot matrix and the modal coefficient matrix to reconstruct and obtain the plane field strength value of the converter valve at the current distance.

[0065] Optionally, the correspondence between the snapshot matrix and the modal coefficient matrix satisfies the following formula:

[0066] W ≈ U'α

[0067] Where U' is the orthogonal matrix, W is the snapshot matrix, and α is the modal coefficient matrix.

[0068] Based on the same inventive concept, the present invention also provides a field strength calculation system, and the system includes:

[0069] The current distance value acquisition unit is used to obtain the current distance value of the to-be-tested converter valve;

[0070] A current modal coefficient matrix determination unit, configured to obtain a modal coefficient matrix corresponding to the current distance value by using a response surface model constructed by using the response surface model construction method of the converter valve according to any one of the above claims 1-8 based on the current distance value;

[0071] A planar field strength value determination unit, configured to reconstruct a planar field strength value of the converter valve at the current distance by using a correspondence relationship between a snapshot matrix and the modal coefficient matrix based on the modal coefficient matrix corresponding to the current distance value.

[0072] Optionally, the correspondence relationship between the snapshot matrix and the modal coefficient matrix satisfies the following formula:

[0073] W≈U'α

[0074] where U' is an orthogonal matrix, W is a snapshot matrix, and α is a modal coefficient matrix.

[0075] Based on the same inventive concept, the present invention further provides a computing device, including: one or more processors;

[0076] The processor is configured to execute one or more programs;

[0077] When the one or more programs are executed by the one or more processors, the response surface model construction method of the converter valve as described above is implemented, or the field strength calculation method as described above is implemented.

[0078] Based on the same inventive concept, the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed, the response surface model construction method of the converter valve as described above is implemented, or the field strength calculation method as described above is implemented.

[0079] Compared with the prior art, the beneficial effects of the present invention are:

[0080] The present invention provides a response surface model construction method, a field strength calculation method, and a system for a converter valve. The response surface model construction method of the converter valve processes the planar field strength simulation results of a plurality of converter valves to be measured corresponding to different distance values through singular value decomposition and proper orthogonal decomposition, and can quickly construct a response surface model. Through the constructed response surface model, the planar field strength value at any converter valve distance in the observation area can be quickly calculated. Within a certain allowable accuracy range, the field strength of the entire observation area can be quickly calculated, and it is not necessary to re-simulate the field strength value of any selected plane, shortening the calculation time and improving work efficiency.

[0081] The field strength calculation method obtains the modal coefficient matrix corresponding to the distance value through the distance value of the converter valve and the constructed response surface model. Through the modal coefficient matrix, the rapid calculation of the plane field strength value at any distance of the converter valve in the observation area can be realized. Within a certain allowable accuracy range, the field strength of the entire observation area can be calculated quickly, and there is no need to re-simulate the field strength value of any selected plane, shortening the calculation time and improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] Figure 1 It is a flowchart of a method for constructing a response surface model of a converter valve provided by the present invention;

[0083] Figure 2 It is a flowchart of another method for constructing a response surface model of a converter valve provided by the present invention;

[0084] Figure 3 It is a flowchart of a method for constructing a response surface model of a converter valve and its effectiveness verification provided by the present invention;

[0085] Figure 4 It is a schematic diagram of the simulation result at a distance of 1 m from the converter valve provided by the present invention

[0086] Figure 5 It is a schematic diagram of the simulation result at a distance of 2 m from the converter valve provided by the present invention;

[0087] Figure 6 It is a schematic diagram of the simulation result at a distance of 3 m from the converter valve provided by the present invention;

[0088] Figure 7 It is a schematic diagram of the simulation result at a distance of 4 m from the converter valve provided by the present invention;

[0089] Figure 8 It is a schematic diagram of the simulation result at a distance of 5 m from the converter valve provided by the present invention;

[0090] Figure 9 It is a schematic diagram of the simulation result at a distance of 6 m from the converter valve provided by the present invention;

[0091] Figure 10 It is a schematic diagram of the simulation result at a distance of 7 m from the converter valve provided by the present invention;

[0092] Figure 11 It is a schematic diagram of the simulation result at a distance of 8 m from the converter valve provided by the present invention;

[0093] Figure 12 It is a schematic diagram of the simulation result at a distance of 9 m from the converter valve provided by the present invention;

[0094] Figure 13 It is a schematic diagram of the simulation result at a distance of 10 m from the converter valve provided by the present invention;

[0095] Figure 14 Schematic diagram of the maximum absolute error curve under the test conditions provided by the present invention;

[0096] Figure 15 Simulation result at a distance of 2.5641 m from the converter valve for the electric field simulation of the three-phase MMC converter valve using simulation software;

[0097] Figure 16 Simulation result at a distance of 5.3846 m from the converter valve for the electric field simulation of the three-phase MMC converter valve using simulation software;

[0098] Figure 17 Block diagram of a response surface model construction system for a converter valve provided by the present invention;

[0099] Figure 18 Flowchart of a field strength calculation method provided by the present invention;

[0100] Figure 19 Block diagram of a field strength calculation system provided by the present invention;

[0101] Figure 20 Block diagram of a computer device provided by the present invention. Detailed implementation manners

[0102] Example 1:

[0103] The present invention is a method for quickly calculating the planar field strength value of the electromagnetic field of a DC converter valve. This method obtains the simulation results of the planar field strength values at multiple distances of the converter valve as a sample set, and performs modal decomposition through singular value decomposition and proper orthogonal decomposition methods to construct a response surface model in which the modal coefficients are related to the distance of the converter valve.

[0104] The following content details the specific implementation manners of the present invention.

[0105] Figure 1 Flowchart of a response surface model construction method for a converter valve provided by the present invention, as Figure 1 shown, the method includes the following steps:

[0106] In step 101, observation surfaces of the converter valve to be tested at multiple different distance values are obtained.

[0107] Among them, each observation surface includes multiple observation points. The converter valve to be tested can be a DC converter valve, such as: three-phase MMC (Modular Multilevel Converter) converter valve, fully controlled converter valve, or soft-switching converter valve, etc.

[0108] A possible implementation of this step is to establish a three-dimensional coordinate system with the converter valve under test as the origin, and take multiple different distance values in any coordinate axis direction outside the converter valve under test; use the two-dimensional plane perpendicular to the coordinate axis corresponding to each different distance value as the observation plane, and obtain the observation plane at each different distance value.

[0109] Exemplarily, an xyz coordinate system (i.e., a three-dimensional coordinate system) is established in space with the center of the converter valve (i.e., the converter valve under test) as the origin, and N different x values x 1 , x 2 … x N are taken in the x-axis direction outside the converter valve, which is called the sample distance vector X = [x 1， x 2 … x N . The N yz planes corresponding to the N x values are the observation planes, and the same m points are selected as the observation points in each yz plane and arranged in a certain order.

[0110] In step 102, the field strength of each observation plane is simulated to obtain the plane field strength simulation result corresponding to each observation plane.

[0111] Among them, each plane field strength simulation result includes the simulated field strength values of multiple observation points, and the plane field strength simulation result can be simply referred to as the simulation result.

[0112] Exemplarily, the above-mentioned n yz plane field simulations are performed on the converter valve to obtain the plane field strength simulation results corresponding to each yz plane (i.e., the observation plane).

[0113] In step 103, based on multiple plane field strength simulation results, a snapshot matrix of the converter valve under test is constructed.

[0114] Among them, each element in the snapshot matrix represents the simulated field strength value of an observation point in an observation plane.

[0115] The specific implementation in this step can be to use the simulated field strength values of multiple observation points in each plane field strength simulation result as the elements of any row vector in the snapshot matrix; arrange the multiple row vectors in the snapshot matrix to obtain the snapshot matrix of the converter valve under test.

[0116] Exemplarily, the simulation results corresponding to n yz planes form the snapshot matrix W, and each element W ij of the snapshot matrix represents the field strength value of the i-th observation point in the yz plane corresponding to the j-th x value. Therefore, the dimension of W is m×n.

[0117] In step 104, for the snapshot matrix of the converter valve under test, modal decomposition is performed using singular value decomposition and proper orthogonal decomposition to obtain the modal coefficient matrix.

[0118] It should be noted that the snapshot matrix can be expressed as the product of the modal coefficient matrix and the modal basis matrix, and the modal coefficient matrix can be understood as the projection of the snapshot matrix on its corresponding modal basis.

[0119] In step 105, based on the modal coefficient matrix and the multiple different distance values, a response surface model corresponding to the modal coefficient matrix and the distance value is constructed.

[0120] Among them, the response surface model can be called the response surface method. The response surface method solves complex nonlinear problems by constructing a polynomial expression of the input variable and the output variable, and its essence is a surrogate model. [3] . The main difference between different response surface methods lies in the different response surface functions for constructing the polynomial expression, including polynomial, radial basis function, Kriging function, support vector machine function, etc. The present invention proposes a fast calculation method for the plane field strength value of the electromagnetic field of a DC converter valve for the problem of fast calculation of the electromagnetic field of the DC converter valve. By performing modal decomposition on the sample simulation data, a response surface model is constructed. The modes at different distances of the converter valve are quickly calculated through the response surface model, and the plane field strength values at different distances of the converter valve are calculated through modal reconstruction.

[0121] The specific implementation method in this step can be to obtain the functional relationship corresponding to the modal coefficient matrix and the distance value based on the modal coefficient matrix, multiple different distance values, the response surface coefficient matrix, and the selected radial basis function matrix; and use the functional relationship corresponding to the modal coefficient matrix and the distance value as the response surface model corresponding to the modal coefficient matrix and the distance value.

[0122] It should be noted that

[0123] The functional relationship corresponding to the modal coefficient matrix and the distance value satisfies the following calculation formula:

[0124] α T (x) = φ(||x - x i ||)λ + Gβ

[0125] Among them, λ is the response surface coefficient matrix, φ is the selected radial basis function matrix, x is the distance value in the functional relationship, x i is the i-th distance value, G(x) is a matrix composed of the powers of x, and each row of x is arranged from the 0th power to the pth power, that is β is the coefficient matrix, α T (x) is the functional relationship corresponding to the modal coefficient matrix and the distance value, and T represents the matrix transpose.

[0126] Exemplarily, a radial basis function response surface model including linear terms is constructed using the sample vector (i.e., the sample distance vector) X, as shown in the following formula,

[0127]

[0128] Among them, λ i is the response surface coefficient, φ represents the selected radial basis function, x is the distance value in the functional relationship, and x i is the i-th distance value, g(x) is a polynomial of order p, β j is the coefficient of each term, and x j is the j-th term of g(x). The modal coefficient matrix α(x) can be expressed as a function of the distance x, and N is the number of distance values.

[0129] In the prior art, the field strength of the converter valve is calculated through the converter valve antenna model. However, due to the complex structure and large scale of the converter valve load, the calculation time is too long. Therefore, a fast calculation method is needed to improve the efficiency of electromagnetic field calculation. The present invention processes the plane field strength simulation results of the converter valve to be measured corresponding to multiple different distance values through singular value decomposition and proper orthogonal decomposition, and can quickly construct a response surface model. Through the constructed response surface model, the plane field strength value at any converter valve distance in the observation area can be quickly calculated. Within a certain allowable accuracy range, the field strength of the entire observation area can be quickly calculated, and there is no need to re-simulate the field strength value of any selected plane, shortening the calculation time and improving the work efficiency.

[0130] Figure 2 is a flowchart of another method for constructing a response surface model of a converter valve provided by the present invention. As Figure 2 shown, the possible implementation manners of step 104 above Figure 1 may include the following steps:

[0131] In step 1041, the snapshot matrix of the converter valve to be measured is subjected to singular value decomposition to obtain a singular value matrix including the eigenvalues of the snapshot matrix.

[0132] Among them, the singular value matrix Σ can be a diagonal matrix composed of the eigenvalues of the snapshot matrix, and the eigenvalues are arranged in descending order from large to small.

[0133] Exemplarily, the snapshot matrix W is subjected to singular value decomposition according to the following formula, where U, Σ, and V respectively represent the left orthogonal matrix, the singular value matrix, and the right orthogonal matrix.

[0134] W = UΣV T

[0135] In step 1042, based on the singular value matrix, modal decomposition is performed using proper orthogonal decomposition to obtain a modal coefficient matrix.

[0136] The specific implementation in this step can be: based on the singular value matrix, select multiple eigenvalues from the singular value matrix by using the eigenvalue selection inequality in the proper orthogonal decomposition; based on the multiple eigenvalues and the eigenvectors corresponding to each eigenvalue, construct a modal coefficient matrix.

[0137] It should be noted that the calculation method of the eigenvalue selection inequality can include: obtaining the eigenvalue selection inequality based on the selection limit value and the eigenvalues in the singular value matrix.

[0138] Among them, the calculation method of the eigenvalue selection inequality is the following formula:

[0139]

[0140] Among them, ε is the selection limit value, σ i is the i-th eigenvalue from large to small in the singular value matrix, d is the number of eigenvalues, n is the number of eigenvalues in the singular value matrix, and d is less than n.

[0141] It should be noted that d leading eigenvalues are selected from the singular value matrix through the eigenvalue selection inequality. After the first d eigenvalues and the corresponding eigenvectors are selected, the snapshot matrix can be expressed as the following formula, and α is called the modal coefficient matrix.

[0142] W≈U' d Σ d V' d =U' d α

[0143] Among them, U' d , Σ d , V' d respectively represent the left orthogonal matrix, the singular value matrix, and the right orthogonal matrix corresponding to the first d eigenvalues.

[0144] In some embodiments, as Figure 3 shown, Figure 3 is a flowchart of a method for constructing a response surface model of a converter valve and validating its effectiveness provided by the present invention. The method for constructing a response surface model of a converter valve can include the following steps:

[0145] In step S1, take N different distance values x of the converter valve 1， x 2 …x N , which is called the sample distance vector X = [x 1， x 2 …x N .

[0146] Exemplarily, 39 observation planes are set in the observation area from 0 to 10 m away from the converter valve, and the number of observation points on each observation plane is 400.

[0147] In step S2, the planar field strength values at different distances of the converter valve are obtained by full-order model simulation to form a snapshot matrix X.

[0148] Exemplarily, the accuracy of the response surface model is proportional to the sample size (i.e., the number of distance values in the sample distance vector). In the present invention, 39 groups of observation planes are selected, which can satisfy the simulation calculation of the DC converter valve. At the same time, the construction time of the response surface model is greatly reduced. The 39 groups of observation planes set in the observation area 0-10 m away from the converter valve are simulated, and the simulation results corresponding to the 39 groups of observation planes are obtained. The data (i.e., simulation results) of the 39 groups of observation planes are exported to form a snapshot matrix.

[0149] In step S3, the snapshot matrix X is singular value decomposed.

[0150] Among them, the snapshot matrix after singular value decomposition is processed by proper orthogonal decomposition to obtain modal coefficients (i.e., modal coefficient matrix).

[0151] In step S4, a response surface model corresponding to the modal coefficient α and the distance of the converter valve is constructed.

[0152] It should be noted that singular value decomposition and proper orthogonal method are used for modal decomposition, and then a response surface surrogate model (i.e., response surface model) is formed according to the radial basis function response surface method including linear terms.

[0153] In step S5, the constructed response surface model is validated for effectiveness.

[0154] Among them, the specific implementation manner of the effectiveness verification of the response surface model may include: inputting any converter valve distance in the inspection area (i.e., inspecting any converter valve distance), obtaining the modal coefficient matrix at this distance according to the response surface model, using the proper orthogonal decomposition method for modal reconstruction, and calculating the planar electromagnetic field strength value at this distance.

[0155] It should be noted that when inspecting the planar field strength value at any converter valve distance, the modal coefficient matrix at this distance can be obtained according to the response surface model, and modal reconstruction is carried out through proper orthogonal decomposition to obtain the result of the planar electromagnetic field strength value at this distance. The present invention can quickly calculate the planar field strength value at any converter valve distance in the observation area through the response surface model, quickly calculate the field strength of the entire observation area within a certain allowable accuracy range, shorten the calculation time, and improve work efficiency.

[0156] Exemplarily, another 10 groups of test planes different from the observation planes are selected to test the effectiveness of the model. The simulation results of the 10 groups of test planes different from the observation planes can be as Figure 4 shown (simulation results at 1 m away from the converter valve), as Figure 5as shown (simulation results at 2 m from the converter valve), such as Figure 6 as shown (simulation results at 3 m from the converter valve), such as Figure 7 as shown (simulation results at 4 m from the converter valve), such as Figure 8 as shown (simulation results at 5 m from the converter valve), such as Figure 9 as shown (simulation results at 6 m from the converter valve), such as Figure 10 as shown (simulation results at 7 m from the converter valve), such as Figure 11 as shown (simulation results at 8 m from the converter valve), such as Figure 12 as shown (simulation results at 9 m from the converter valve) and as Figure 13 shown (simulation results at 10 m from the converter valve), first calculate the plane field strength at these 10 sets of test plane distances through a surrogate model (i.e., response surface model), then compare it with the simulation results, calculate the absolute error, that is, compare the calculation results of the 10 sets of test planes with the software simulation data, and obtain the maximum absolute error curve as Figure 14 shown. At the same time, the calculation efficiencies of this algorithm and software simulation are respectively compared, and the specific results are shown in the following table:

[0157]

[0158] Table 1 Discrimination Results

[0159] Among them, this algorithm can be the response surface model provided by the present invention, as Figure 15 shown and as Figure 16 shown, Figure 15 is the simulation result at 2.5641 m from the converter valve for the electric field simulation of the three-phase MMC converter valve using simulation software, Figure 16 is the simulation result at 5.3846 m from the converter valve for the electric field simulation of the three-phase MMC converter valve using simulation software.

[0160] It can be seen from the above results that the maximum absolute error does not exceed 1.2 V / m, and the farther away from the converter valve, the smaller the error, and the calculation efficiency is significantly improved.

[0161] Example 2:

[0162] Figure 17 is a block diagram of a response surface model construction system for a converter valve provided by the present invention, as Figure 17 shown, and the system includes:

[0163] An observation surface acquisition unit 1701, configured to acquire observation surfaces of the to-be-tested converter valve at multiple different distance values, and each observation surface includes multiple observation points;

[0164] The simulation result determination unit 1702 is configured to perform simulations on the field strengths of each observation plane to obtain the plane field strength simulation results corresponding to each observation plane, and each plane field strength simulation result includes the simulated field strength values of multiple observation points;

[0165] The snapshot matrix construction unit 1703 is configured to construct a snapshot matrix of the converter valve to be measured based on multiple plane field strength simulation results, and each element in the snapshot matrix represents the simulated field strength value of an observation point in an observation plane;

[0166] The modal coefficient matrix determination unit 1704 is configured to perform modal decomposition on the snapshot matrix of the converter valve to be measured by using singular value decomposition and proper orthogonal decomposition to obtain a modal coefficient matrix;

[0167] The response surface model construction unit 1705 is configured to construct a response surface model corresponding to the modal coefficient matrix and the distance values based on the modal coefficient matrix and the multiple different distance values.

[0168] Optionally, the modal coefficient matrix determination unit 1704 includes:

[0169] The singular value matrix determination module is configured to perform singular value decomposition on the snapshot matrix of the converter valve to be measured to obtain a singular value matrix including the eigenvalues of the snapshot matrix;

[0170] The modal coefficient matrix determination module is configured to perform modal decomposition based on the singular value matrix by using proper orthogonal decomposition to obtain a modal coefficient matrix.

[0171] Optionally, the modal coefficient matrix determination module is specifically configured to:

[0172] Based on the singular value matrix, use the eigenvalue selection inequality in proper orthogonal decomposition to select multiple eigenvalues from the singular value matrix;

[0173] Based on the multiple eigenvalues and the eigenvectors corresponding to each eigenvalue, construct a modal coefficient matrix.

[0174] Optionally, the system further includes a selection inequality determination unit, and the selection inequality calculation unit is configured to:

[0175] Based on the selection limit value and the eigenvalues in the singular value matrix, obtain the eigenvalue selection inequality.

[0176] Optionally, the calculation method of the eigenvalue selection inequality is the following formula:

[0177]

[0178] where ε is the selection limit value, σ iis the i-th eigenvalue in the singular value matrix arranged from large to small, d is the number of eigenvalues, n is the number of eigenvalues in the singular value matrix, and d is less than n.

[0179] Optionally, the snapshot matrix construction unit 1703 is specifically configured to:

[0180] Use the simulated field strength values of multiple observation points in each planar field strength simulation result as the elements of any row vector in the snapshot matrix;

[0181] Arrange the multiple row vectors in the snapshot matrix to obtain the snapshot matrix of the converter valve under test.

[0182] Optionally, the response surface model construction unit 1705 is specifically configured to:

[0183] Based on the modal coefficient matrix, multiple different distance values, the response surface coefficient matrix, and the selected radial basis function matrix, obtain the functional relationship between the modal coefficient matrix and the distance value;

[0184] Use the functional relationship between the modal coefficient matrix and the distance value as the response surface model corresponding to the modal coefficient matrix and the distance value.

[0185] Optionally, the functional relationship between the modal coefficient matrix and the distance value satisfies the following calculation formula:

[0186] α T (x) = φ(||x - x i ||)λ + Gβ

[0187] where λ is the response surface coefficient matrix, φ is the selected radial basis function matrix, x is the distance value in the functional relationship, x i is the i-th distance value, G(x) is a matrix composed of powers of x, and each row of x is arranged from the 0th power to the pth power, that is β is the coefficient matrix, α T (x) is the functional relationship between the modal coefficient matrix and the distance value, and T represents matrix transpose.

[0188] Optionally, the observation surface acquisition unit 1701 is specifically configured to:

[0189] Establish a three-dimensional coordinate system with the converter valve under test as the origin, and take multiple different distance values in any coordinate axis direction outside the converter valve under test;

[0190] Use the two-dimensional plane perpendicular to the coordinate axis corresponding to each different distance value as the observation surface to obtain the observation surface at each different distance value.

[0191] Example 3:

[0192] Figure 18Flowchart of a field strength calculation method provided by the present invention, as shown in Figure 18 shown, the method may include the following steps:

[0193] In step 1801, obtain the current distance value of the converter valve to be measured.

[0194] Wherein, the current distance value can be any test distance x test .

[0195] In step 1802, based on the current distance value, use the response surface model constructed by the response surface model construction method of the converter valve described in the above embodiment to obtain the modal coefficient matrix corresponding to the current distance value.

[0196] It should be noted that when any test distance x test is input, use the constructed response surface model to directly obtain the modal coefficient matrix of the test distance x test , as shown in the following formula:

[0197] α T (x test ) = φ(||x test - x i ||)λ + Gβ

[0198] Wherein, λ is the response surface coefficient matrix, φ is the selected radial basis function matrix, x is the distance value in the functional relationship, x i is the i-th distance value, G(x) is the matrix composed of the powers of x, and each row of x is arranged from the 0th power to the pth power, that is β is the coefficient matrix, α T (x) is the functional relationship between the modal coefficient matrix and the distance value, and T represents the matrix transpose.

[0199] Exemplarily, when any test distance x test is input, use the constructed response surface model to directly obtain the modal coefficient matrix of the test distance x test , as shown in the following formula:

[0200]

[0201] Wherein, λ i is the response surface coefficient, φ represents the selected radial basis function, x is the distance value in the functional relationship, x i is the i-th distance value, g(x test ) is a p-order polynomial, β j is the coefficient of each term, (x test ) j is the j-th term of g(x test ), and the modal coefficient matrix α(x test)(i.e., α) can be expressed as a function of the distance x test and N is the number of distance values.

[0202] In step 1803, based on the modal coefficient matrix corresponding to the current distance value, and using the corresponding relationship between the snapshot matrix and the modal coefficient matrix for reconstruction, the planar field strength value of the converter valve at the current distance is obtained.

[0203] It should be noted that the corresponding relationship between the snapshot matrix and the modal coefficient matrix satisfies the following formula:

[0204] W≈U'α

[0205] where U' is an orthogonal matrix, W is the snapshot matrix, and α is the modal coefficient matrix.

[0206] Exemplarily, according to the above corresponding relationship between the snapshot matrix and the modal coefficient matrix to reconstruct the field, the planar field strength values of m points at the test distance x test are obtained.

[0207] The present invention is a method for quickly calculating the planar field strength value of the electromagnetic field of a DC converter valve. The method mainly calculates the planar field strength values of the converter valve (i.e., the converter valve to be measured) at different distances by performing modal reconstruction on the constructed response surface model. Among them, the method for constructing the response surface model of the converter valve is to obtain the simulation results of the planar field strength values at multiple distances as a sample set, and perform modal decomposition on the data through the proper orthogonal decomposition method to construct a response surface model (or select the field strength values of multiple planes to form a training set and construct a response surface proxy model). This response surface model can be a correlation function between the modal coefficients and the distance of the converter valve. A method for quickly calculating the planar field strength value of a DC converter valve proposed by the present invention can quickly calculate the planar field strength value at any distance within a certain accuracy range through the constructed response surface proxy model, and there is no need to re-simulate the field strength values of any selected plane, greatly shortening the simulation calculation time.

[0208] Example 4:

[0209] Figure 19 is a block diagram of a field strength calculation system provided by the present invention. As Figure 19 shown, the system includes:

[0210] A current distance value acquisition unit 1901, configured to acquire the current distance value of the converter valve to be measured;

[0211] A current modal coefficient matrix determination unit 1902, configured to obtain the modal coefficient matrix corresponding to the current distance value based on the current distance value and using the response surface model constructed by the response surface model construction method of the converter valve described in the above embodiment;

[0212] The planar field strength value determination unit 1903 is configured to reconstruct based on the modal coefficient matrix corresponding to the current distance value by using the correspondence between the snapshot matrix and the modal coefficient matrix, so as to obtain the planar field strength value of the converter valve at the current distance.

[0213] Optionally, the correspondence between the snapshot matrix and the modal coefficient matrix satisfies the following formula:

[0214] W≈U'α

[0215] where U' is an orthogonal matrix, W is a snapshot matrix, and α is a modal coefficient matrix.

[0216] Embodiment 5:

[0217] Based on the same inventive concept, the present invention further provides a computer device. As Figure 20 shown, the computer device includes a processor and a memory. The memory is used to store a computer program, and the computer program includes program instructions. The processor is used to execute the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, and is suitable for implementing one or more instructions. Specifically, it is suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of a method for constructing a response surface model of a converter valve or the steps of a field strength calculation method in the above embodiments.

[0218] Embodiment 6:

[0219] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory). The computer-readable storage medium is a memory device in a computer device and is used to store programs and data. It can be understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and, of course, the extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, and this storage space stores the operating system of the terminal. Moreover, one or more instructions suitable for being loaded and executed by the processor are also stored in this storage space. These instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The one or more instructions stored in the computer-readable storage medium can be loaded and executed by the processor to implement the steps of a method for constructing a response surface model of a commutation valve or the steps of a field strength calculation method in the above embodiments.

[0220] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0221] The present invention is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the specified functions in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0222] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured product including an instruction device, and this instruction device implements the processes in Figure 1One or more processes and / or blocks Figure 1 The functions specified in one or more blocks.

[0223] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one Figure 1 One or more processes and / or blocks Figure 1 The steps of the functions specified in one or more blocks.

[0224] The above are only embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A response surface model construction method for a converter valve, characterized in that: The method comprises: Obtaining observation surfaces of the converter valve to be tested at multiple different distance values, each observation surface including multiple observation points; Simulating the field strength of each observation surface to obtain a plane field strength simulation result corresponding to each observation surface, each plane field strength simulation result including simulated field strength values ​​of multiple observation points; Based on multiple plane field strength simulation results, a snapshot matrix of the converter valve to be tested is constructed, wherein each element in the snapshot matrix represents a simulated field strength value of an observation point in an observation plane; The snapshot matrix of the converter valve to be tested is subjected to modal decomposition by using singular value decomposition and intrinsic orthogonal decomposition to obtain a modal coefficient matrix; Based on the modal coefficient matrix and the multiple different distance values, a response surface model corresponding to the modal coefficient matrix and the distance values ​​is constructed.

2. The method according to claim 1, characterized in that The snapshot matrix of the converter valve to be tested is subjected to modal decomposition using singular value decomposition and intrinsic orthogonal decomposition to obtain a modal coefficient matrix, including: Performing singular value decomposition on the snapshot matrix of the converter valve to be tested to obtain a singular value matrix including eigenvalues ​​of the snapshot matrix; Based on the singular value matrix, modal decomposition is performed using eigenorthogonal decomposition to obtain a modal coefficient matrix.

3. The method according to claim 2, characterized in that The method of performing modal decomposition based on the singular value matrix and obtaining a modal coefficient matrix by using intrinsic orthogonal decomposition includes: Based on the singular value matrix, a plurality of eigenvalues ​​are selected from the singular value matrix using an eigenvalue selection inequality in an eigenorthogonal decomposition; A modal coefficient matrix is ​​constructed based on the multiple eigenvalues ​​and the eigenvector corresponding to each eigenvalue.

4. The method according to claim 3, characterized in that The calculation method of the eigenvalue selection inequality includes: The eigenvalue selection inequality is obtained based on the selection limit and the eigenvalues ​​in the singular value matrix.

5. The method according to claim 4, characterized in that The calculation method of the eigenvalue selection inequality is as follows: Among them, ε is the selected limit, σ i is the i-th eigenvalue in the singular value matrix from large to small, d is the number of eigenvalues, n is the number of eigenvalues ​​in the singular value matrix, and d is less than n.

6. The method according to claim 1, characterized in that The step of constructing a snapshot matrix of the converter valve to be tested based on multiple plane field strength simulation results includes: The simulated field intensity values ​​of multiple observation points in each plane field intensity simulation result are used as elements of any row vector in the snapshot matrix; Arrange multiple row vectors in the snapshot matrix to obtain the snapshot matrix of the converter valve to be tested.

7. The method according to any one of claims 1 to 6, characterized in that: The step of constructing a response surface model corresponding to the modal coefficient matrix and the distance values ​​based on the modal coefficient matrix and the multiple different distance values ​​includes: Based on the modal coefficient matrix, a plurality of different distance values, a response surface coefficient matrix, and a selected radial basis function matrix, a functional relationship between the modal coefficient matrix and the distance value is obtained; The functional relationship between the modal coefficient matrix and the distance value is used as a response surface model between the modal coefficient matrix and the distance value.

8. The method according to claim 7, characterized in that The functional relationship between the modal coefficient matrix and the distance value satisfies the following calculation formula: a T (x)=φ(||xx i ||)λ+Gβ Among them, λ is the response surface coefficient matrix, φ is the selected radial basis function matrix, x is the distance value in the functional relationship, and x i is the i-th distance value, G(x) is a matrix composed of the powers of x, and each row of x is arranged from 0th power to pth power, that is, β is the coefficient matrix, α T (x) is the functional relationship between the modal coefficient matrix and the distance value, and T represents the matrix transpose.

9. The method according to any one of claims 1 to 6, characterized in that: The step of obtaining the observation surface of the converter valve to be tested at a plurality of different distance values ​​includes: A three-dimensional coordinate system is established with the converter valve to be tested as the origin, and a plurality of different distance values ​​in any coordinate axis direction outside the converter valve to be tested are taken; The two-dimensional plane perpendicular to the coordinate axis corresponding to each different distance value is used as the observation surface to obtain the observation surface at each different distance value.

10. A response surface model construction system for a converter valve, characterized in that: The system comprises: An observation surface acquisition unit, used to acquire the observation surface of the converter valve to be tested at multiple different distance values, each observation surface including multiple observation points; A simulation result determination unit is used to simulate the field strength of each observation surface to obtain a plane field strength simulation result corresponding to each observation surface, each plane field strength simulation result including simulated field strength values ​​of multiple observation points; A snapshot matrix construction unit, used to construct a snapshot matrix of the converter valve to be tested based on multiple plane field strength simulation results, wherein each element in the snapshot matrix represents a simulated field strength value of an observation point in an observation plane; A modal coefficient matrix determination unit, used for performing modal decomposition on the snapshot matrix of the converter valve to be tested by using singular value decomposition and intrinsic orthogonal decomposition to obtain a modal coefficient matrix; The response surface model construction unit is used to construct a response surface model corresponding to the modal coefficient matrix and the distance values ​​based on the modal coefficient matrix and the multiple different distance values.

11. The system according to claim 10, characterized in that The modal coefficient matrix determination unit comprises: A singular value matrix determination module, used for performing singular value decomposition on the snapshot matrix of the converter valve to be tested to obtain a singular value matrix including eigenvalues ​​of the snapshot matrix; The modal coefficient matrix determination module is used to perform modal decomposition based on the singular value matrix using eigenorthogonal decomposition to obtain the modal coefficient matrix.

12. The system according to claim 11, characterized in that The modal coefficient matrix determination module is specifically used for: Based on the singular value matrix, a plurality of eigenvalues ​​are selected from the singular value matrix using an eigenvalue selection inequality in an eigenorthogonal decomposition; A modal coefficient matrix is ​​constructed based on the multiple eigenvalues ​​and the eigenvector corresponding to each eigenvalue.

13. The system according to claim 12, characterized in that The system further comprises a selected inequality determination unit, and the selected inequality calculation unit is used to: The eigenvalue selection inequality is obtained based on the selection limit and the eigenvalues ​​in the singular value matrix.

14. The system according to claim 13, characterized in that The calculation method of the eigenvalue selection inequality is as follows: Among them, ε is the selected limit, σ i is the i-th eigenvalue in the singular value matrix from large to small, d is the number of eigenvalues, n is the number of eigenvalues ​​in the singular value matrix, and d is less than n.

15. The system according to claim 10, characterized in that The snapshot matrix construction unit is specifically used for: The simulated field intensity values ​​of multiple observation points in each plane field intensity simulation result are used as elements of any row vector in the snapshot matrix; Arrange multiple row vectors in the snapshot matrix to obtain the snapshot matrix of the converter valve to be tested.

16. The system according to any one of claims 10 to 15, characterized in that: The response surface model building unit is specifically used for: Based on the modal coefficient matrix, a plurality of different distance values, a response surface coefficient matrix, and a selected radial basis function matrix, a functional relationship between the modal coefficient matrix and the distance value is obtained; The functional relationship between the modal coefficient matrix and the distance value is used as a response surface model between the modal coefficient matrix and the distance value.

17. The system according to claim 16, characterized in that The functional relationship between the modal coefficient matrix and the distance value satisfies the following calculation formula: a T (x)=φ(||xx i ||)λ+Gβ Among them, λ is the response surface coefficient matrix, φ is the selected radial basis function matrix, x is the distance value in the functional relationship, and x i is the i-th distance value, G(x) is a matrix composed of the powers of x, and each row of x is arranged from 0th power to pth power, that is, β is the coefficient matrix, α T (x) is the functional relationship between the modal coefficient matrix and the distance value, and T represents the matrix transpose.

18. The system according to any one of claims 10 to 15, characterized in that: The observation surface acquisition unit is specifically used for: A three-dimensional coordinate system is established with the converter valve to be tested as the origin, and a plurality of different distance values ​​in any coordinate axis direction outside the converter valve to be tested are taken; The two-dimensional plane perpendicular to the coordinate axis corresponding to each different distance value is used as the observation surface to obtain the observation surface at each different distance value.

19. A method for calculating field strength, characterized in that: The method comprises: Obtain the current distance value of the converter valve to be tested; Based on the current distance value, a response surface model constructed by the response surface model construction method of the converter valve according to any one of claims 1 to 9 is used to obtain a modal coefficient matrix corresponding to the current distance value; Based on the modal coefficient matrix corresponding to the current distance value, the corresponding relationship between the snapshot matrix and the modal coefficient matrix is ​​reconstructed to obtain the plane field strength value of the converter valve to be tested at the current distance.

20. The method according to claim 19, characterized in that The corresponding relationship between the snapshot matrix and the modal coefficient matrix satisfies the following formula: W≈U'α Among them, U' is an orthogonal matrix, W is a snapshot matrix, and α is a modal coefficient matrix.

21. A field strength calculation system, characterized in that: The system comprises: A current distance value acquisition unit, used to acquire the current distance value of the converter valve to be tested; A current modal coefficient matrix determining unit, configured to obtain a modal coefficient matrix corresponding to the current distance value based on the current distance value using a response surface model constructed by the response surface model construction method for a converter valve according to any one of claims 1 to 9; The plane field strength value determination unit is used to reconstruct the plane field strength value of the converter valve to be tested at the current distance based on the modal coefficient matrix corresponding to the current distance value by using the corresponding relationship between the snapshot matrix and the modal coefficient matrix.

22. The system according to claim 21, characterized in that The corresponding relationship between the snapshot matrix and the modal coefficient matrix satisfies the following formula: W≈U'α Among them, U' is an orthogonal matrix, W is a snapshot matrix, and α is a modal coefficient matrix.

23. A computer device, characterized in that: include: one or more processors; The processor is used to store one or more programs; When the one or more programs are executed by the one or more processors, the response surface model construction method of the converter valve as described in any one of claims 1 to 9 is implemented, or the field strength calculation method as described in any one of claims 19 to 20 is implemented.

24. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the response surface model construction method of the converter valve as described in any one of claims 1 to 9 is implemented, or the field strength calculation method as described in any one of claims 19 to 20 is implemented.

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