Method and device for determining distribution of synthetic electric field of three-dimensional table body insulation structure

Abstract

The invention relates to a synthetic electric field distribution determination method and device for a three-dimensional platform body insulation structure, and belongs to the technical field of electromagnetic field computation.The synthetic electric field distribution determination method for the three-dimensional platform body insulation structure comprises the steps that geometric modeling and mesh generation are conducted on the three-dimensional platform body insulation structure, and the three-dimensional platform body insulation structure is obtained; obtaining a three-dimensional model corresponding to the three-dimensional platform body insulation structure and node coordinates corresponding to the three-dimensional model; constructing a two-dimensional radial equivalent model and a two-dimensional axial equivalent model based on the three-dimensional model; determining space charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model; and based on the space charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model and the node coordinates corresponding to the three-dimensional model, determining the synthetic electric field distribution of the three-dimensional platform body insulation structure. According to the method, the calculation efficiency of the synthetic electric field distribution of the three-dimensional table body insulation structure is improved, and meanwhile, the accuracy of a calculation result is ensured.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic field calculation technology, and in particular to a method and device for determining the synthetic electric field distribution of a three-dimensional platform insulation structure. Background Art

[0002] In key equipment of HVDC transmission systems such as DC cables, converter transformers, and DC bushings, the accumulation of space charge under DC voltage and the distortion of the synthetic electric field are key factors affecting the insulation performance of equipment and inducing insulation failures. They are also the bottleneck problem that currently restricts the improvement of the design level of HVDC equipment. The calculation of the synthetic electric field of the insulation structure with accumulated space charge is an important task in the insulation structure design of HVDC transmission and transformation equipment.

[0003] In the numerical simulation of synthetic electric fields, the bipolar carrier transport model is currently a widely recognized mathematical model, but existing numerical simulation studies of synthetic electric fields are mostly aimed at simple one-dimensional and two-dimensional structures, and some areas in high-voltage DC equipment cannot be equivalently simplified to two dimensions. Direct simulation solutions of three-dimensional synthetic electric fields have problems such as poor convergence and low solution efficiency, which are difficult to meet actual needs.

[0004] Therefore, how to improve the efficiency and accuracy of solving three-dimensional synthetic electric fields has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, it is necessary to provide a method and device for determining the synthetic electric field distribution of a three-dimensional platform insulating structure to solve the problems of poor convergence and low solution efficiency of the current simulation solution of the three-dimensional synthetic electric field.

[0006] In order to solve the above problems, the present invention provides a method for determining the synthetic electric field distribution of a three-dimensional platform insulating structure, comprising: Performing geometric modeling and meshing on the three-dimensional platform insulation structure to obtain a three-dimensional model corresponding to the three-dimensional platform insulation structure and node coordinates corresponding to the three-dimensional model; Constructing a two-dimensional radial equivalent model and a two-dimensional axial equivalent model based on the three-dimensional model; Determining the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model; Based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, and the node coordinates corresponding to the three-dimensional model, the synthetic electric field distribution of the three-dimensional platform insulation structure is determined.

[0007] In a possible implementation, determining the synthetic electric field distribution of the three-dimensional platform insulation structure based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, and the node coordinates corresponding to the three-dimensional model, includes: interpolating the node charge density of the two-dimensional radial equivalent model to the cross section of the two-dimensional radial equivalent model corresponding to the three-dimensional model to obtain interpolation reference data; Determining a plurality of axial paths in the two-dimensional axial equivalent model, and determining the node coordinates and node charge density of the two-dimensional axial equivalent model corresponding to the plurality of axial paths; Based on the node coordinates and node charge density of the two-dimensional axial equivalent model corresponding to the multiple axial paths, determining a relationship between the node charge density of the two-dimensional axial equivalent model on each axial path and the node coordinates; Based on the correspondence between the node coordinates corresponding to any node in the three-dimensional model and the multiple axial paths, and the relationship between the node charge density of the two-dimensional axial equivalent model on each axial path and the node coordinates, determine the interpolation correction coefficient corresponding to any node in the three-dimensional model; The synthetic electric field distribution of the three-dimensional platform insulation structure is determined based on the node coordinates corresponding to any node in the three-dimensional model, the interpolation correction coefficient corresponding to any node in the three-dimensional model, and the interpolation reference data.

[0008] In a possible implementation, the determining of the interpolation correction coefficient corresponding to any node in the three-dimensional model based on the correspondence between the node coordinates corresponding to any node in the three-dimensional model and the multiple axial paths, and the relationship between the node charge density of the two-dimensional axial equivalent model and the node coordinates, includes: In the case where the node coordinates corresponding to any node in the three-dimensional model are located on the multiple axial paths, based on the relationship between the node charge density of the two-dimensional axial equivalent model and the node coordinates on the axial path where the node coordinates corresponding to any node in the three-dimensional model are located, determine the interpolation correction coefficient corresponding to any node in the three-dimensional model; When the node coordinates corresponding to any node in the three-dimensional model are not located on the multiple axial paths, the interpolation correction coefficient corresponding to any node in the three-dimensional model is determined based on the relationship between the node charge density of the two-dimensional axial equivalent model and the node coordinates on two adjacent axial paths of the node coordinates corresponding to any node in the three-dimensional model.

[0009] In a possible implementation, determining the synthetic electric field distribution of the three-dimensional platform insulation structure based on the node coordinates corresponding to any node in the three-dimensional model, the interpolation correction coefficient corresponding to any node in the three-dimensional model, and the interpolation reference data includes: interpolating the interpolation reference data based on the node coordinates corresponding to any node in the three-dimensional model, and taking the product of the interpolation reference data after the interpolation and the interpolation correction coefficient corresponding to any node in the three-dimensional model as the node charge density corresponding to any node in the three-dimensional model; Based on the node charge densities corresponding to all nodes in the three-dimensional model, the synthetic electric field distribution of the three-dimensional mesa insulating structure is determined.

[0010] In a possible implementation, determining the synthetic electric field distribution of the three-dimensional platform insulation structure based on the node charge density corresponding to all nodes in the three-dimensional model includes: Constructing a Poisson equation based on node charge densities corresponding to all nodes in the three-dimensional model; The Poisson's equation is solved to obtain the synthetic electric field distribution of the three-dimensional mesa insulating structure.

[0011] In a possible implementation, constructing a two-dimensional radial equivalent model and a two-dimensional axial equivalent model based on the three-dimensional model includes: Using a first plane to intercept the three-dimensional model, to obtain the two-dimensional radial equivalent model; Using a second plane to intercept the three-dimensional model, to obtain the two-dimensional axial equivalent model; The first plane is a plane with the geometric center axis of the three-dimensional model as its normal, and the second plane is a plane where the geometric center axis of the three-dimensional model is located.

[0012] In a possible implementation manner, determining the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model includes: Constructing mathematical models corresponding to the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model based on a bipolar carrier transport model; The mathematical models corresponding to the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model are solved to obtain the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model.

[0013] The present invention also provides a device for determining the synthetic electric field distribution of a three-dimensional platform insulating structure, comprising: The first construction module is used to perform geometric modeling and meshing on the three-dimensional platform insulation structure to obtain a three-dimensional model corresponding to the three-dimensional platform insulation structure and node coordinates corresponding to the three-dimensional model; A second construction module is used to construct a two-dimensional radial equivalent model and a two-dimensional axial equivalent model based on the three-dimensional model; A first determination module is used to determine the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model; The second determination module is used to determine the synthetic electric field distribution of the three-dimensional platform insulation structure based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, and the node coordinates corresponding to the three-dimensional model.

[0014] The present invention also provides an electronic device, including a memory and a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for determining the synthetic electric field distribution of the three-dimensional platform insulating structure as described above is implemented.

[0015] The present invention also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for determining the synthetic electric field distribution of the three-dimensional platform insulating structure as described above is implemented.

[0016] The beneficial effect of the present invention is that the method and device for determining the synthetic electric field distribution of a three-dimensional table-type insulating structure provided by the present invention can first construct a three-dimensional model corresponding to the three-dimensional table-type insulating structure, and then construct a two-dimensional radial equivalent model and a two-dimensional axial equivalent model based on the three-dimensional model, thereby converting the calculation of the spatial charge distribution from three-dimensional space to two-dimensional space, reducing the complexity of the calculation of the synthetic electric field distribution, and thereby improving the efficiency of the calculation of the synthetic electric field distribution, and then determining the synthetic electric field distribution of the three-dimensional table-type insulating structure based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model. Compared with directly calculating the synthetic electric field distribution in three-dimensional space, it has higher accuracy. While improving the efficiency of calculating the synthetic electric field distribution of the three-dimensional table-type insulating structure, the present invention also ensures the accuracy of the calculation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic flow chart of an embodiment of a method for determining a synthetic electric field distribution of a three-dimensional platform insulating structure provided by the present invention; Figure 2 A schematic flow chart of an embodiment of a process for determining the synthetic electric field distribution of a three-dimensional platform insulating structure provided by the present invention; Figure 3 A schematic structural diagram of an embodiment of a device for determining the synthetic electric field distribution of a three-dimensional platform insulating structure provided by the present invention; Figure 4 A schematic structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0019] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0020] In the description of the present invention, reference to an "embodiment" means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the described embodiments may be combined with other embodiments.

[0021] In key equipment of HVDC transmission systems such as DC cables, converter transformers, and DC bushings, the accumulation of space charge under DC voltage and the distortion of the synthetic electric field are key factors affecting the insulation performance of equipment and inducing insulation failures. They are also the bottleneck problem that currently restricts the improvement of the design level of HVDC equipment. The calculation of the synthetic electric field of the insulation structure with accumulated space charge is an important task in the insulation structure design of HVDC transmission and transformation equipment.

[0022] In the numerical simulation of synthetic electric fields, the bipolar carrier transport model is currently a widely recognized mathematical model, but existing numerical simulation studies of synthetic electric fields are mostly aimed at simple one-dimensional and two-dimensional structures, and some areas in high-voltage DC equipment cannot be equivalently simplified to two dimensions. Direct simulation solutions of three-dimensional synthetic electric fields have problems such as poor convergence and low solution efficiency, which are difficult to meet actual needs.

[0023] In order to solve the above problems, the present invention provides a method for determining the synthetic electric field distribution of a three-dimensional mesa insulating structure.

[0024] The specific embodiments are described in detail below: A specific embodiment of the present invention discloses a method for determining the synthetic electric field distribution of a three-dimensional platform insulating structure, combining Figure 1 Come and see, Figure 1 A schematic flow chart of an embodiment of a method for determining a synthetic electric field distribution of a three-dimensional platform insulating structure provided by the present invention, comprising steps S101 to S104, wherein: In step S101, geometric modeling and meshing are performed on the three-dimensional platform insulation structure to obtain a three-dimensional model corresponding to the three-dimensional platform insulation structure and node coordinates corresponding to the three-dimensional model; In step S102, a two-dimensional radial equivalent model and a two-dimensional axial equivalent model are constructed based on the three-dimensional model; In step S103, determining the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model; In step S104, the synthetic electric field distribution of the three-dimensional platform insulation structure is determined based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, and the node coordinates corresponding to the three-dimensional model.

[0025] During implementation, firstly, the three-dimensional platform insulation structure can be geometrically modeled and meshed by means of external modeling of three-dimensional modeling software and direct modeling of numerical simulation software to obtain a three-dimensional model corresponding to the three-dimensional platform insulation structure and the node coordinates corresponding to the three-dimensional model.

[0026] The structural features of the three-dimensional platform insulation structure may include: a cylindrical conductor passes through the axis of the platform; the cylindrical conductor part is wrapped with a solid insulation layer 1 of uniform thickness; the solid insulation layer 1 is a single layer of solid insulation material or a multi-layer solid insulation material; the insulation material 2 made of fluid, solid or other materials is filled between the grounding shell outside the solid insulation layer 1, and the insulation material 2 and the grounding shell are in the shape of a platform and cover the solid insulation material 1. The three-dimensional platform insulation structure can be used to simulate the local insulation structure in high-voltage DC electrical equipment such as DC cables, converter transformer winding outlets, and DC bushings.

[0027] After obtaining the three-dimensional model corresponding to the three-dimensional platform insulation structure, a two-dimensional radial equivalent model and a two-dimensional axial equivalent model can be constructed according to the three-dimensional model, and then the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model can be determined.

[0028] Finally, the synthetic electric field distribution of the three-dimensional platform insulation structure can be determined based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, as well as the node coordinates corresponding to the three-dimensional model.

[0029] The method for determining the synthetic electric field distribution of a three-dimensional platform insulation structure provided by the present invention can be applied to the spatial charge distribution calculation scenario of the three-dimensional platform insulation structure in high-voltage DC electrical equipment, and can also be used in the spatial charge distribution calculation scenario of other three-dimensional platform insulation structures. The present invention does not make any specific limitations on this.

[0030] Compared with the prior art, the method for determining the synthetic electric field distribution of a three-dimensional table-type insulating structure provided in this embodiment can first construct a three-dimensional model corresponding to the three-dimensional table-type insulating structure, and then construct a two-dimensional radial equivalent model and a two-dimensional axial equivalent model based on the three-dimensional model, thereby converting the calculation of the spatial charge distribution from three-dimensional space to two-dimensional space, reducing the complexity of the calculation of the synthetic electric field distribution, and thereby improving the efficiency of the calculation of the synthetic electric field distribution, and then determining the synthetic electric field distribution of the three-dimensional table-type insulating structure based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model. Compared with directly calculating the synthetic electric field distribution in three-dimensional space, it has higher accuracy. While improving the efficiency of calculating the synthetic electric field distribution of the three-dimensional table-type insulating structure, the present invention also ensures the accuracy of the calculation results.

[0031] Exemplarily, determining the synthetic electric field distribution of the three-dimensional table insulation structure based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, and the node coordinates corresponding to the three-dimensional model, includes: interpolating the node charge density of the two-dimensional radial equivalent model to the cross section of the two-dimensional radial equivalent model corresponding to the three-dimensional model to obtain interpolation reference data; Determining a plurality of axial paths in the two-dimensional axial equivalent model, and determining the node coordinates and node charge density of the two-dimensional axial equivalent model corresponding to the plurality of axial paths; Based on the node coordinates and node charge density of the two-dimensional axial equivalent model corresponding to the multiple axial paths, determining a relationship between the node charge density of the two-dimensional axial equivalent model on each axial path and the node coordinates; Based on the correspondence between the node coordinates corresponding to any node in the three-dimensional model and the multiple axial paths, and the relationship between the node charge density of the two-dimensional axial equivalent model on each axial path and the node coordinates, determine the interpolation correction coefficient corresponding to any node in the three-dimensional model; The synthetic electric field distribution of the three-dimensional platform insulation structure is determined based on the node coordinates corresponding to any node in the three-dimensional model, the interpolation correction coefficient corresponding to any node in the three-dimensional model, and the interpolation reference data.

[0032] Specifically, when determining the synthetic electric field distribution of the three-dimensional platform insulation structure according to the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, and the node coordinates corresponding to the three-dimensional model, the node charge density of the two-dimensional radial equivalent model can be firstly interpolated to the cross section corresponding to the three-dimensional model to obtain interpolation reference data. The interpolation method can include the nearest neighbor interpolation method, the bilinear interpolation method, etc.

[0033] Then, multiple axial paths can be determined in the two-dimensional axial equivalent model, and the node coordinates and node charge density of the two-dimensional axial equivalent model corresponding to the multiple axial paths can be determined. The axial path is a path parallel to the symmetry axis of the two-dimensional axial equivalent model.

[0034] Then, the relationship between the node charge density of the two-dimensional axial equivalent model on each axial path and the node coordinates can be determined based on the node coordinates and node charge density of the two-dimensional axial equivalent model corresponding to the multiple axial paths. For example, the relationship between the node charge density of the two-dimensional axial equivalent model on each axial path and the node coordinates can be determined by fitting methods such as polynomial fitting and exponential fitting.

[0035] Then, the interpolation correction coefficient corresponding to any node in the three-dimensional model can be determined according to the correspondence between the node coordinates corresponding to any node in the three-dimensional model and the multiple axial paths, and the relationship between the node charge density of the two-dimensional axial equivalent model on each axial path and the node coordinates. For example, the interpolation correction coefficients corresponding to the nodes located on the axial path and the nodes not located on the axial path in the three-dimensional model are different.

[0036] Finally, the synthetic electric field distribution of the three-dimensional platform insulation structure can be determined according to the node coordinates corresponding to any node in the three-dimensional model, the interpolation correction coefficient corresponding to any node in the three-dimensional model, and the interpolation reference data. For example, the interpolation reference data can be interpolated and corrected according to the corresponding relationship between the node coordinates corresponding to any node in the three-dimensional model in the two-dimensional radial equivalent model, thereby obtaining the synthetic electric field distribution of the three-dimensional platform insulation structure.

[0037] According to the corresponding relationship between the nodes in the three-dimensional model in the two-dimensional equivalent model and the spatial charge distribution of the two-dimensional equivalent model, the synthetic electric field distribution of the three-dimensional table-type insulating structure is further determined, which can effectively improve the accuracy of the calculation of the synthetic electric field distribution of the three-dimensional table-type insulating structure.

[0038] Exemplarily, the determining of the interpolation correction coefficient corresponding to any node in the three-dimensional model based on the correspondence between the node coordinates corresponding to any node in the three-dimensional model and the multiple axial paths, and the relationship between the node charge density of the two-dimensional axial equivalent model and the node coordinates, includes: In the case where the node coordinates corresponding to any node in the three-dimensional model are located on the multiple axial paths, based on the relationship between the node charge density of the two-dimensional axial equivalent model and the node coordinates on the axial path where the node coordinates corresponding to any node in the three-dimensional model are located, determine the interpolation correction coefficient corresponding to any node in the three-dimensional model; When the node coordinates corresponding to any node in the three-dimensional model are not located on the multiple axial paths, the interpolation correction coefficient corresponding to any node in the three-dimensional model is determined based on the relationship between the node charge density of the two-dimensional axial equivalent model and the node coordinates on two adjacent axial paths of the node coordinates corresponding to any node in the three-dimensional model.

[0039] Specifically, when determining the interpolation correction coefficient corresponding to any node in the three-dimensional model according to the corresponding relationship between the node coordinates corresponding to any node in the three-dimensional model and the multiple axial paths, and the relationship between the node charge density of the two-dimensional axial equivalent model and the node coordinates, if the node is located on multiple axial paths, the interpolation correction coefficient corresponding to the node can be determined according to the relationship between the node charge density of the two-dimensional axial equivalent model and the node coordinates on the axial path where the node is located. If the node is not located on multiple axial paths, the interpolation correction coefficient corresponding to the node can be determined according to the relationship between the node charge density of the two-dimensional axial equivalent model and the node coordinates on two adjacent axial paths.

[0040] Exemplarily, determining the synthetic electric field distribution of the three-dimensional platform insulation structure based on the node coordinates corresponding to any node in the three-dimensional model, the interpolation correction coefficient corresponding to any node in the three-dimensional model, and the interpolation reference data includes: interpolating the interpolation reference data based on the node coordinates corresponding to any node in the three-dimensional model, and taking the product of the interpolation reference data after the interpolation and the interpolation correction coefficient corresponding to any node in the three-dimensional model as the node charge density corresponding to any node in the three-dimensional model; Based on the node charge densities corresponding to all nodes in the three-dimensional model, the synthetic electric field distribution of the three-dimensional mesa insulating structure is determined.

[0041] Specifically, when determining the synthetic electric field distribution of the three-dimensional platform insulation structure according to the node coordinates corresponding to any node in the three-dimensional model, the interpolation correction coefficient corresponding to any node in the three-dimensional model, and the interpolation reference data, the interpolation reference data can be interpolated first according to the corresponding relationship between the node coordinates corresponding to any node in the three-dimensional model in the two-dimensional radial equivalent plane. For example, if the node is located in the two-dimensional radial equivalent plane, there is no need to interpolate the interpolation reference data, otherwise it is necessary to interpolate the interpolation reference data and then correct the interpolated interpolation reference data by the interpolation correction coefficient corresponding to the node.

[0042] After obtaining the node charge densities corresponding to all nodes in the three-dimensional model, the synthetic electric field distribution of the three-dimensional platform insulation structure can be further determined based on the node charge densities corresponding to all nodes in the three-dimensional model.

[0043] Exemplarily, determining the synthetic electric field distribution of the three-dimensional table insulation structure based on the node charge density corresponding to all nodes in the three-dimensional model includes: Constructing a Poisson equation based on node charge densities corresponding to all nodes in the three-dimensional model; The Poisson's equation is solved to obtain the synthetic electric field distribution of the three-dimensional mesa insulating structure.

[0044] Specifically, when determining the synthetic electric field distribution of the three-dimensional table-type insulating structure based on the node charge density corresponding to all nodes in the three-dimensional model, the Poisson's equation can be first constructed based on the node charge density corresponding to all nodes in the three-dimensional model, and then the Poisson's equation can be solved to obtain the synthetic electric field distribution of the three-dimensional table-type insulating structure.

[0045] Exemplarily, constructing a two-dimensional radial equivalent model and a two-dimensional axial equivalent model based on the three-dimensional model includes: Using a first plane to intercept the three-dimensional model, to obtain the two-dimensional radial equivalent model; Using a second plane to intercept the three-dimensional model, to obtain the two-dimensional axial equivalent model; The first plane is a plane with the geometric center axis of the three-dimensional model as its normal, and the second plane is a plane where the geometric center axis of the three-dimensional model is located.

[0046] Specifically, when constructing a two-dimensional radial equivalent model and a two-dimensional axial equivalent model based on a three-dimensional model, the plane with the geometric center axis of the three-dimensional model as the normal can be used as the first plane to intercept the three-dimensional model to obtain a two-dimensional radial equivalent model; at the same time, the plane where the geometric center axis of the three-dimensional model is located can be used as the second plane to intercept the three-dimensional model to obtain a two-dimensional axial equivalent model.

[0047] Exemplarily, determining the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model includes: Constructing mathematical models corresponding to the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model based on a bipolar carrier transport model; The mathematical models corresponding to the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model are solved to obtain the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model.

[0048] Specifically, when determining the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, we can first construct a mathematical model corresponding to the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model based on the bipolar carrier transport model, and then solve the mathematical model by methods such as the transient upflow finite element method and the Runge-Kutta discontinuous Galerkin method to obtain the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model.

[0049] When constructing mathematical models corresponding to the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, the boundary corresponding to the central conductor in the three-dimensional model can be determined as a high potential, and the boundary corresponding to the grounded shell can be determined as a ground potential as loading boundary conditions.

[0050] The following is a specific application scenario to better illustrate the technical solution of the present invention: Combination Figure 2 Come and see, Figure 2 This is a flow chart of an embodiment of a process for determining the synthetic electric field distribution of a three-dimensional platform insulating structure provided by the present invention. The process includes the following steps: Step S201: geometric modeling and meshing of a three-dimensional model to obtain the coordinates of the nodes of the three-dimensional model.

[0051] The structural features of the three-dimensional platform insulation structure are as follows: a cylindrical conductor passes through the axis of the platform; the cylindrical conductor part is wrapped with a solid insulation layer 1 of uniform thickness; the solid insulation layer 1 is a single-layer solid insulation material or a multi-layer solid insulation material; the insulation material 2 made of fluid, solid or other materials is filled between the grounding shell outside the solid insulation layer 1, and the insulation material 2 and the grounding shell are in the shape of a platform and cover the solid insulation material 1. The three-dimensional platform insulation structure can be used to simulate the local insulation structure in high-voltage DC electrical equipment such as DC cables, converter transformer winding outlets, and DC bushings.

[0052] The three-dimensional insulation structure geometric model can be established by means including but not limited to external modeling of three-dimensional modeling software and direct modeling of numerical simulation software; meshing is completed on the numerical simulation software, and node numbers and node coordinates are exported as dat files.

[0053] Step S202: construct a two-dimensional radial and two-dimensional axial equivalent model, and calculate the spatial charge distribution of the two-dimensional equivalent model.

[0054] A certain section of the three-dimensional model parallel to the bottom surface of the platform is selected, and a two-dimensional plane symmetric model is constructed with the section structure parameters as the two-dimensional radial equivalent model; a certain symmetry plane of the three-dimensional model perpendicular to the bottom surface of the platform is selected, and a two-dimensional axisymmetric model is established with the 1 / 2 structure of the symmetry plane along the axis as the two-dimensional axial equivalent model.

[0055] The solution steps for calculating the spatial charge distribution of the two-dimensional radial and two-dimensional axial equivalent models are: (1) The boundary corresponding to the central conductor of the model is set as high potential, and the boundary corresponding to the grounded shell in the model is set as ground potential, and the boundary conditions are loaded.

[0056] (2) Selecting, including but not limited to, a bipolar carrier transport model as a mathematical model for the simulation calculation of the spatial charge distribution of the two-dimensional radial and two-dimensional axial equivalent models.

[0057] (3) Solving the mathematical model by using methods including but not limited to transient upflow finite element method, Runge-Kutta discontinuous Galerkin method, etc.

[0058] (4) Export the node coordinates and node charge density of the two-dimensional radial and two-dimensional axial equivalent models as dat files.

[0059] Step S203: obtaining interpolation reference data and interpolation correction coefficients corresponding to the three-dimensional nodes, and calculating the spatial charge density of each node of the three-dimensional model.

[0060] Based on the correspondence between the node coordinates of the three-dimensional insulation structure model and the node coordinates of the two-dimensional radial and two-dimensional axial equivalent models, the interpolation benchmark data and interpolation correction coefficients corresponding to the three-dimensional nodes are obtained, and the spatial charge density of each node of the three-dimensional insulation structure model is obtained by interpolation mapping calculation node by node. The specific steps and methods are as follows: (1) Use methods including but not limited to nearest neighbor interpolation and bilinear interpolation to interpolate the node charge density of the two-dimensional radial model to the corresponding cross section of the three-dimensional insulating structure model as the interpolation benchmark data.

[0061] (2) With the symmetry axis of the two-dimensional axial model as the y-axis, in the rectangular coordinate system, near the high-voltage conductor of the two-dimensional axial model, including but not limited to the insulating material 1 part, specify Bar Coordinates ( and is an integer) as the axial path.

[0062] (3) Obtaining nodes in the two-dimensional axial equivalent model Coordinates satisfy Node Coordinates and nodal charge density, 2D axial equivalent model nodes The coordinate geometry meaning corresponds to the cylindrical coordinates coordinate.

[0063] (4) Use fitting methods such as but not limited to polynomial fitting and exponential fitting to obtain equations including but not limited to the following: ( is the degree of the polynomial, The relationship between the node charge density and the node coordinates of the two-dimensional axial equivalent model with ( ) being the polynomial fitting coefficient.

[0064] (5) Convert the node coordinates of the 3D model to the cylindrical coordinate system. The axis coincides with the axis of the central conductor of the 3D model. Coordinates satisfy , the 3D model node Nodes where coordinates and interpolation benchmark data are located The coordinates are respectively brought into the relationship between the node charge density and the node coordinates of the two-dimensional axial model , calculate the interpolation correction coefficient .

[0065] When the 3D model node to be interpolated Coordinates satisfy , find Bar Coordinates ( and is an integer) in the axial path 3D model nodes larger than the value to be interpolated Path index of the coordinates , the path As upper bound , the path As a lower bound , the 3D model node Nodes where coordinates and interpolation benchmark data are located The coordinates are respectively brought into the relationship between the node charge density and the node coordinates of the two-dimensional axial model , calculate the interpolation correction coefficient:

[0066] (6) Based on the 3D model nodes to be interpolated in the spatial rectangular coordinate system , , Coordinate and cylindrical coordinate systems , , Coordinates, when looking for satisfaction and and The charge density corresponding to the node is multiplied by the interpolation correction coefficient. Then assign it to the 3D model node to be interpolated.

[0067] When you can't find satisfaction and and The nodes in the three-dimensional model to be interpolated are , The coordinates are used as the coordinate index of the two-dimensional plane point, interpolated based on the interpolation benchmark data, and multiplied by the interpolation correction coefficient as the corresponding interpolation benchmark data of the three-dimensional model node to be interpolated Then assign it to the 3D model node to be interpolated.

[0068] Step S204: Load the node space charge density in the three-dimensional model, set boundary conditions, and solve the synthetic electric field distribution of the three-dimensional insulating structure.

[0069] Based on the spatial charge density of the nodes, the boundary conditions are set and the Poisson's equation is solved to obtain the synthetic electric field distribution of the three-dimensional insulating structure.

[0070] The embodiment of the present invention also provides a device for determining the synthetic electric field distribution of a three-dimensional platform insulating structure, Figure 3 Come and see, Figure 3 This is a schematic structural diagram of an embodiment of a device for determining the synthetic electric field distribution of a three-dimensional platform insulating structure provided by the present invention. The device 300 for determining the synthetic electric field distribution of a three-dimensional platform insulating structure includes: The first construction module 301 is used to perform geometric modeling and meshing on the three-dimensional platform insulation structure to obtain a three-dimensional model corresponding to the three-dimensional platform insulation structure and node coordinates corresponding to the three-dimensional model; A second construction module 302 is used to construct a two-dimensional radial equivalent model and a two-dimensional axial equivalent model based on the three-dimensional model; A first determination module 303 is used to determine the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model; The second determination module 304 is used to determine the synthetic electric field distribution of the three-dimensional platform insulation structure based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, and the node coordinates corresponding to the three-dimensional model.

[0071] The specific implementation methods of each module of the device for determining the synthetic electric field distribution of a three-dimensional platform insulating structure can be referred to the description of the method for determining the synthetic electric field distribution of the three-dimensional platform insulating structure mentioned above, and have similar beneficial effects, which will not be repeated here.

[0072] The embodiment of the present invention further provides an electronic device, Figure 4 Come and see, Figure 4 This is a structural schematic diagram of an electronic device according to an embodiment of the present invention. The electronic device 400 includes a processor 401, a memory 402, and a computer program stored in the memory 402 and executable on the processor 401. When the processor 401 executes the program, the method for determining the synthetic electric field distribution of the three-dimensional table insulating structure as described above is implemented.

[0073] As a preferred embodiment, the electronic device 400 further includes a display 403 for displaying that the processor 401 executes the method for determining the synthetic electric field distribution of the three-dimensional platform insulating structure as described above.

[0074] Exemplarily, the computer program may be divided into one or more modules / units, one or more modules / units are stored in the memory 402, and executed by the processor 401 to complete the present invention. One or more modules / units may be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the electronic device 400. For example, the computer program may be divided into the first building module 301, the second building module 302, the first determination module 303, and the second determination module 304 in the above embodiment. The specific functions of each module are as described above, and are not described one by one here.

[0075] The electronic device 400 may be a desktop computer, a notebook, a PDA or a smart phone with an adjustable camera module.

[0076] Among them, the processor 401 may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor 401 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0077] The memory 402 may be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electric erasable programmable read-only memory (EEPROM), etc. The memory 402 is used to store programs, and the processor 401 executes the program after receiving the execution instruction. The process definition method disclosed in any of the embodiments of the present invention may be applied to the processor 401 or implemented by the processor 401.

[0078] The display 403 may be an LCD display screen or an LED display screen, for example, a display screen on a mobile phone.

[0079] Understandably, Figure 4 The structure shown is only a schematic diagram of the structure of the electronic device 400. The electronic device 400 may also include Figure 4 More or fewer components as shown. Figure 4 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0080] The electronic device provided according to the above-mentioned embodiment of the present invention can be implemented with reference to the specific description of the method for determining the synthetic electric field distribution of the three-dimensional table-shaped insulating structure as described above according to the present invention, and has similar beneficial effects as the method for determining the synthetic electric field distribution of the three-dimensional table-shaped insulating structure as described above, which will not be repeated here.

[0081] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the method for determining the synthetic electric field distribution of the three-dimensional platform insulating structure as described above is implemented.

[0082] Generally speaking, the computer instructions for implementing the method of the present invention can be carried by any combination of one or more computer-readable storage media. Non-transitory computer-readable storage media can include any computer-readable media except for the signal itself that is temporarily propagating.

[0083] Computer-readable storage media may be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more conductors, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium that contains or stores a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0084] Computer program codes for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages, in particular, Python suitable for neural network computing and platform frameworks based on TensorFlow, PyTorch, etc. may be used. The program code may be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0085] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0086] The present invention discloses a method and device for determining the synthetic electric field distribution of a three-dimensional table-type insulating structure. First, a three-dimensional model corresponding to the three-dimensional table-type insulating structure can be constructed, and then a two-dimensional radial equivalent model and a two-dimensional axial equivalent model can be constructed based on the three-dimensional model, thereby converting the calculation of the spatial charge distribution from the three-dimensional space to the two-dimensional space, reducing the complexity of the calculation of the synthetic electric field distribution, thereby improving the efficiency of the calculation of the synthetic electric field distribution, and then determining the synthetic electric field distribution of the three-dimensional table-type insulating structure based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model. Compared with directly calculating the synthetic electric field distribution in the three-dimensional space, the method has higher accuracy. While improving the efficiency of the calculation of the synthetic electric field distribution of the three-dimensional table-type insulating structure, the present invention also ensures the accuracy of the calculation results.

[0087] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for determining the synthetic electric field distribution of a three-dimensional platform insulating structure, characterized in that: include: Performing geometric modeling and meshing on the three-dimensional platform insulation structure to obtain a three-dimensional model corresponding to the three-dimensional platform insulation structure and node coordinates corresponding to the three-dimensional model; Constructing a two-dimensional radial equivalent model and a two-dimensional axial equivalent model based on the three-dimensional model; Determining the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model; Based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, and the node coordinates corresponding to the three-dimensional model, the synthetic electric field distribution of the three-dimensional platform insulation structure is determined.

2. The method for determining the synthetic electric field distribution of a three-dimensional platform insulating structure according to claim 1, characterized in that: The method of determining the synthetic electric field distribution of the three-dimensional platform insulation structure based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, and the node coordinates corresponding to the three-dimensional model, comprises: interpolating the node charge density of the two-dimensional radial equivalent model to the cross section of the two-dimensional radial equivalent model corresponding to the three-dimensional model to obtain interpolation reference data; Determining a plurality of axial paths in the two-dimensional axial equivalent model, and determining the node coordinates and node charge density of the two-dimensional axial equivalent model corresponding to the plurality of axial paths; Based on the node coordinates and node charge density of the two-dimensional axial equivalent model corresponding to the multiple axial paths, determining a relationship between the node charge density of the two-dimensional axial equivalent model on each axial path and the node coordinates; Based on the correspondence between the node coordinates corresponding to any node in the three-dimensional model and the multiple axial paths, and the relationship between the node charge density of the two-dimensional axial equivalent model on each axial path and the node coordinates, determine the interpolation correction coefficient corresponding to any node in the three-dimensional model; The synthetic electric field distribution of the three-dimensional platform insulation structure is determined based on the node coordinates corresponding to any node in the three-dimensional model, the interpolation correction coefficient corresponding to any node in the three-dimensional model, and the interpolation reference data.

3. The method for determining the synthetic electric field distribution of a three-dimensional platform insulating structure according to claim 2, characterized in that: The interpolation correction coefficient corresponding to any node in the three-dimensional model is determined based on the correspondence between the node coordinates corresponding to any node in the three-dimensional model and the multiple axial paths, and the relationship between the node charge density of the two-dimensional axial equivalent model and the node coordinates, including: In the case where the node coordinates corresponding to any node in the three-dimensional model are located on the multiple axial paths, based on the relationship between the node charge density of the two-dimensional axial equivalent model and the node coordinates on the axial path where the node coordinates corresponding to any node in the three-dimensional model are located, determine the interpolation correction coefficient corresponding to any node in the three-dimensional model; When the node coordinates corresponding to any node in the three-dimensional model are not located on the multiple axial paths, the interpolation correction coefficient corresponding to any node in the three-dimensional model is determined based on the relationship between the node charge density of the two-dimensional axial equivalent model and the node coordinates on two adjacent axial paths of the node coordinates corresponding to any node in the three-dimensional model.

4. The method for determining the synthetic electric field distribution of a three-dimensional platform insulating structure according to claim 3, characterized in that: Determining the synthetic electric field distribution of the three-dimensional platform insulation structure based on the node coordinates corresponding to any node in the three-dimensional model, the interpolation correction coefficient corresponding to any node in the three-dimensional model, and the interpolation reference data, includes: interpolating the interpolation reference data based on the node coordinates corresponding to any node in the three-dimensional model, and taking the product of the interpolation reference data after the interpolation and the interpolation correction coefficient corresponding to any node in the three-dimensional model as the node charge density corresponding to any node in the three-dimensional model; Based on the node charge densities corresponding to all nodes in the three-dimensional model, the synthetic electric field distribution of the three-dimensional mesa insulating structure is determined.

5. The method for determining the synthetic electric field distribution of a three-dimensional platform insulating structure according to claim 4, characterized in that: The step of determining the synthetic electric field distribution of the three-dimensional platform insulating structure based on the node charge density corresponding to all nodes in the three-dimensional model includes: Constructing a Poisson equation based on node charge densities corresponding to all nodes in the three-dimensional model; The Poisson's equation is solved to obtain the synthetic electric field distribution of the three-dimensional mesa insulating structure.

6. The method for determining the synthetic electric field distribution of a three-dimensional mesa insulating structure according to any one of claims 1 to 5, characterized in that: The constructing of a two-dimensional radial equivalent model and a two-dimensional axial equivalent model based on the three-dimensional model comprises: Using a first plane to intercept the three-dimensional model, to obtain the two-dimensional radial equivalent model; Using a second plane to intercept the three-dimensional model, to obtain the two-dimensional axial equivalent model; The first plane is a plane with the geometric center axis of the three-dimensional model as its normal, and the second plane is a plane where the geometric center axis of the three-dimensional model is located.

7. The method for determining the synthetic electric field distribution of a three-dimensional platform insulating structure according to claim 6, characterized in that: The determining of the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model comprises: Constructing mathematical models corresponding to the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model based on a bipolar carrier transport model; The mathematical models corresponding to the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model are solved to obtain the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model.

8. A device for determining the synthetic electric field distribution of a three-dimensional platform insulating structure, characterized in that: include: The first construction module is used to perform geometric modeling and meshing on the three-dimensional platform insulation structure to obtain a three-dimensional model corresponding to the three-dimensional platform insulation structure and node coordinates corresponding to the three-dimensional model; A second construction module is used to construct a two-dimensional radial equivalent model and a two-dimensional axial equivalent model based on the three-dimensional model; A first determination module is used to determine the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model; The second determination module is used to determine the synthetic electric field distribution of the three-dimensional platform insulation structure based on the spatial charge distribution of the two-dimensional radial equivalent model and the two-dimensional axial equivalent model, and the node coordinates corresponding to the three-dimensional model.

9. An electronic device, characterized in that: The invention comprises a memory and a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for determining the synthetic electric field distribution of the three-dimensional platform insulating structure according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, the method for determining the synthetic electric field distribution of the three-dimensional mesa insulating structure according to any one of claims 1 to 7 is implemented.

Images