Transformer temperature rise field simulation method and device

Abstract

The invention discloses a transformer temperature rise field simulation method and device, and the method comprises the steps: building a simulation model corresponding to a transformer based on the structure of the transformer; performing thermal simulation according to the simulation model corresponding to the transformer, and determining a thermal field simulation model corresponding to the transformer; performing fluid simulation according to the simulation model corresponding to the transformer, and determining a fluid simulation model corresponding to the transformer; based on the thermal field simulation model, the fluid simulation model, the heat transfer control equation and the boundary conditions, determining a fluid-solid coupling temperature field mathematical model corresponding to the transformer; and calculating the temperature field of the transformer based on the fluid-structure interaction temperature field mathematical model and the load, and performing order reduction processing and calculation on the temperature field of the transformer through the agent model to obtain a simulation result of the temperature rise field of the transformer. According to the method, the calculation efficiency of transformer temperature rise field simulation calculation can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of transformers, and in particular to a method and device for simulating temperature rise field of a transformer. Background Art

[0002] Transformer digital twin technology is a cutting-edge engineering technology that maps the operating status of the physical transformer into its digital model to achieve real-time monitoring, analysis and optimization of the transformer. With the help of transformer digital twin technology, the operating data of the transformer can be obtained in real time, and in-depth fault prediction and performance optimization can be carried out based on the transformer operating data.

[0003] Transformer digital twin technology can be realized through the transformer digital twin model. The transformer digital twin model is used to simulate and calculate the temperature rise field of the transformer, that is, to simulate and calculate the temperature rise of the transformer components. Therefore, based on the simulation calculation results of the transformer temperature rise field, a three-dimensional image of the transformer thermal field can be determined. The three-dimensional image is used to realize real-time monitoring, analysis and optimization of the transformer.

[0004] At present, the calculation problem of physical field is mainly solved by traditional numerical simulation methods (such as finite element method, finite volume method, etc.), that is, the temperature rise field of transformer is simulated by traditional numerical methods. However, the traditional finite element model has a high degree of freedom and needs to discretize the space domain and time domain at the same time, which will result in a huge amount of calculation and a calculation time of several hours, resulting in poor calculation efficiency of simulation calculation, which is not suitable for transformer digital twin model. Summary of the invention

[0005] In view of this, an embodiment of the present application provides a transformer temperature rise field simulation method and device, aiming to improve the calculation efficiency of transformer temperature rise field simulation calculation.

[0006] In a first aspect, an embodiment of the present application provides a transformer temperature rise field simulation method, the method comprising:

[0007] Based on the structure of the transformer, a simulation model corresponding to the transformer is constructed;

[0008] Perform thermal simulation according to the simulation model corresponding to the transformer to determine the thermal field simulation model corresponding to the transformer;

[0009] Perform fluid simulation according to the simulation model corresponding to the transformer to determine the fluid simulation model corresponding to the transformer;

[0010] Determine a fluid-solid coupling temperature field mathematical model corresponding to the transformer based on the thermal field simulation model, the fluid simulation model, the heat transfer control equation, and the boundary conditions;

[0011] The temperature field of the transformer is calculated based on the fluid-solid coupling temperature field mathematical model and the load, and the temperature field of the transformer is reduced and calculated through the proxy model to obtain the simulation result of the transformer temperature rise field.

[0012] In a second aspect, an embodiment of the present application provides a transformer temperature rise field simulation device, the device comprising:

[0013] A construction module, used for constructing a simulation model corresponding to the transformer based on the structure of the transformer;

[0014] A first determination module is used to perform thermal simulation according to the simulation model corresponding to the transformer to determine the thermal field simulation model corresponding to the transformer;

[0015] A second determination module is used to perform fluid simulation according to the simulation model corresponding to the transformer to determine the fluid simulation model corresponding to the transformer;

[0016] A third determination module is used to determine a fluid-solid coupling temperature field mathematical model corresponding to the transformer based on the thermal field simulation model, the fluid simulation model, the heat transfer control equation, and the boundary conditions;

[0017] The calculation module is used to calculate the temperature field of the transformer based on the fluid-solid coupling temperature field mathematical model and the load, and to reduce the order and calculate the temperature field of the transformer through the proxy model to obtain the simulation result of the transformer temperature rise field.

[0018] In a third aspect, an embodiment of the present application provides a transformer temperature rise field simulation device, the device comprising:

[0019] Memory for storing computer programs;

[0020] The processor is used to execute the computer program so that the device executes the transformer temperature rise field simulation method described in the first aspect.

[0021] In a fourth aspect, an embodiment of the present application provides a computer storage medium, on which a computer program is stored. When the computer program is executed, the device executing the computer program implements the transformer temperature rise field simulation method described in the first aspect above.

[0022] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0023] The embodiment of the present application provides a transformer temperature rise field simulation method, in which a simulation model corresponding to the transformer can be first constructed based on the structure of the transformer, and then a thermal simulation can be performed according to the simulation model corresponding to the transformer to determine the thermal field simulation model corresponding to the transformer, and a fluid simulation can also be performed according to the simulation model corresponding to the transformer to determine the fluid simulation model corresponding to the transformer. Since the heat generated by the transformer during operation mainly comes from the ohmic loss generated by the interaction between the current and the resistance, it is transferred from the inside to the winding surface of the transformer in the form of heat conduction, and after contacting the transformer oil, the heat is transferred to the external environment in the form of heat convection, that is, the heat transfer process of the transformer component belongs to the heat transfer between the solid and the fluid. Therefore, based on the thermal field simulation model corresponding to the transformer and its fluid simulation model, combined with the heat transfer control equation and the boundary conditions, the fluid-solid coupling temperature field mathematical model corresponding to the transformer can be determined, so that the temperature field of the transformer can be calculated based on the fluid-solid coupling temperature field mathematical model that combines the solid and the fluid for coupling calculation and the load, so as to improve the accuracy of the temperature field calculation of the transformer digital twin model. In addition, the temperature field of the transformer can be reduced and calculated through the proxy model to obtain the simulation results of the transformer temperature rise field, so as to reduce the calculation workload and improve the calculation efficiency of the transformer temperature rise field simulation calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in this embodiment or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A flow chart of a transformer temperature rise field simulation method provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of the simulation results of the temperature field of the pull plate at different load rates provided in the embodiment of the present application;

[0027] Figure 3 A schematic diagram of the temperature field simulation results of the clamp under different load rates provided in the embodiment of the present application;

[0028] Figure 4 A schematic diagram of a simulation rendering of a pull plate and a clamp with a load rate of 120% after the downgrading process provided in an embodiment of the present application;

[0029] Figure 5 A schematic structural diagram of a transformer temperature rise field simulation device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] Digital twin technology is an innovative technology that integrates the physical world and the digital world. It establishes a digital model of a physical object to achieve real-time monitoring, simulation and optimization of its entire life cycle. Digital twin technology integrates multiple technologies such as sensor data, the Internet of Things, artificial intelligence, big data analysis and cloud computing, so it can accurately reflect the state and behavior of physical objects. This technology has a wide range of applications, including but not limited to manufacturing, energy, medical, and transportation industries. This technology can not only improve the operating efficiency and reliability of physical systems, but also provide powerful tools for predictive maintenance, resource optimization and intelligent decision-making, accelerating the digital transformation and intelligent upgrading of various industries.

[0032] Accordingly, the transformer digital twin technology can obtain the transformer operation data in real time with the help of sensors, the Internet of Things, big data analysis, artificial intelligence, simulation technology, cloud computing and other technologies, and then conduct in-depth fault prediction and performance optimization based on the transformer operation data. Therefore, the transformer digital twin technology can not only improve the operating efficiency and reliability of the transformer, but also significantly reduce maintenance costs and downtime, and promote the intelligent and modern development of the power system.

[0033] The digital twin of power equipment refers to a virtual scene built based on a real scene. The two scenes are connected through sensors and data interaction interfaces to form a closed-loop data exchange channel, thereby realizing the virtual-real mapping and two-way iterative optimization of physical equipment and digital space, so as to present the equipment status based on the twin model and analyze the equipment performance based on the twin data. The digital twin architecture mainly includes the physical layer, edge layer, infrastructure service layer, platform service layer and software service layer.

[0034] Transformer digital twin technology can be realized through the transformer digital twin model. The transformer digital twin model is used to simulate and calculate the temperature rise field of the transformer, that is, to simulate and calculate the temperature rise of the transformer components. Therefore, based on the simulation calculation results of the transformer temperature rise field, a three-dimensional image of the transformer thermal field can be determined. The three-dimensional image is used to realize real-time monitoring, analysis and optimization of the transformer.

[0035] At present, the calculation problem of physical field is mainly solved by traditional numerical simulation methods (such as finite element method, finite volume method, etc.), that is, the temperature rise field of transformer is simulated by traditional numerical methods. However, the traditional finite element model has a high degree of freedom and needs to discretize the space domain and time domain at the same time, which will result in a huge amount of calculation and a calculation time of several hours, resulting in poor calculation efficiency of simulation calculation, which is not suitable for transformer digital twin model.

[0036] Based on this, in order to solve the above problems, in the embodiment of the present application, firstly, a simulation model corresponding to the transformer can be constructed based on the structure of the transformer, and then, a thermal simulation can be performed according to the simulation model corresponding to the transformer to determine the thermal field simulation model corresponding to the transformer, and a fluid simulation can also be performed according to the simulation model corresponding to the transformer to determine the fluid simulation model corresponding to the transformer. Since the heat generated by the transformer during operation mainly comes from the ohmic loss generated by the interaction between the current and the resistance, it is transferred from the inside to the winding surface of the transformer in the form of heat conduction, and after contacting the transformer oil, the heat will be transferred to the external environment in the form of heat convection, that is, the heat transfer process of the transformer component belongs to the heat transfer between the solid and the fluid. Therefore, based on the thermal field simulation model corresponding to the transformer and its fluid simulation model, combined with the heat transfer control equation and the boundary conditions, the mathematical model of the fluid-solid coupling temperature field corresponding to the transformer can be determined, so that the temperature field of the transformer can be calculated based on the mathematical model of the fluid-solid coupling temperature field that combines the solid and the fluid for coupling calculation and the load, so as to improve the accuracy of the temperature field calculation of the transformer digital twin model. In addition, the temperature field of the transformer can be reduced and calculated through the proxy model to obtain the simulation results of the transformer temperature rise field, so as to reduce the calculation workload and improve the calculation efficiency of the transformer temperature rise field simulation calculation.

[0037] The specific implementation of the transformer temperature rise field simulation method and device in the embodiment of the present application is described in detail below with reference to the accompanying drawings by way of examples.

[0038] See also Figure 1 , which is a flow chart of a transformer temperature rise field simulation method provided in an embodiment of the present application, combined with Figure 1 As shown, it may specifically include:

[0039] S101: Based on the structure of the transformer, a simulation model corresponding to the transformer is constructed.

[0040] The structure of the transformer mainly includes transformer coil, upper clamp, copper shield, core sheet, magnetic shunt, oil tank, pull plate, and lower clamp. The simulation model of the transformer refers to a tool for simulating and analyzing the transformer through simulation technology.

[0041] As an example, a 1:1 equivalent 3D simulation model of each component of the transformer can be established by 3D mechanical design software. In this regard, the present application does not specifically limit the 3D mechanical design software.

[0042] S102: Performing thermal simulation according to the simulation model corresponding to the transformer to determine the thermal field simulation model corresponding to the transformer.

[0043] In a possible implementation, after determining the simulation model of each component in the transformer, the three-dimensional simulation model of each component in the transformer can be imported into the thermal field module in the simulation platform, and the thermal field parameters can be set in the platform, and the grid information can be initialized and loaded. At the same time, the solver can also be set as a transient solver, and relevant solution parameters can be set in the solver to determine the thermal field simulation model corresponding to each component of the transformer.

[0044] Among them, the above-mentioned thermal field parameters refer to physical quantities related to the thermal field, including material properties, heat transfer parameters and coupling surfaces of physical fields. Specifically, the material properties of each component of the transformer may include thermal conductivity, specific heat capacity and density, but the present application does not specifically limit the material properties. Heat transfer parameters are used to indicate the characteristics and laws of heat transfer between objects or within objects, such as convection heat transfer coefficients, and the present application does not specifically limit heat transfer parameters. The coupling surface of the physical field refers to the interface where different physical fields interact and influence each other, specifically including the interface between transformer insulating oil and solid.

[0045] In the simulation platform, the simulation model of each component in the transformer can also be meshed, so that the mesh information can be loaded so that the mesh size and type can adapt to the complexity of the simulation model and the solution accuracy requirements, thereby ensuring that the geometric shape and physical properties of the simulation model can be accurately simulated during analysis. At the same time, the initial conditions of the thermal field can also be set in the simulation platform, for example, the initial temperature distribution, etc., that is, the thermal field is initialized. In this regard, the present application does not specifically limit the simulation platform.

[0046] In the simulation platform, the solver refers to the computing component used to solve the full-order finite element model of the fluid-solid coupling temperature field, that is, the solver is used to solve the temperature field of each component in the transformer. Since the heat generated by the transformer winding during operation mainly comes from the ohmic loss generated by the interaction between the current and the resistance, it is transferred from the inside to the winding surface in the form of heat conduction, and then transferred to the external environment in the form of heat convection after contacting the transformer oil. Therefore, the temperature of each part of the transformer changes over time, that is, the solver is set to a transient solver to meet the needs of temperature rise. At the same time, relevant solution parameters can also be set in the solver, such as solution time step, total solution time, convergence criterion and other parameters, to ensure that the corresponding thermal process of the transformer can be accurately simulated based on the above parameters. Therefore, based on the above process, the thermal field simulation model corresponding to each component in the transformer can be determined. The thermal field simulation model is used to indicate the heat generation and conversion process of each component in the transformer.

[0047] S103: Perform fluid simulation according to the simulation model corresponding to the transformer to determine the fluid simulation model corresponding to the transformer.

[0048] In one possible implementation, after determining the simulation model of each component in the transformer, the three-dimensional simulation model of each component in the transformer can be imported into a simulation platform, and the fluid field parameters can be set in the platform, and the grid information can be initialized and loaded. At the same time, the solver can be set as a transient solver, and relevant solution parameters can be set in the solver to determine the fluid simulation model corresponding to each component of the transformer.

[0049] As an example, the three-dimensional simulation models of various components in the transformer can be imported into the fluid simulation module Fluent in the simulation platform to simulate and analyze physical phenomena such as fluid flow and heat transfer based on the module.

[0050] Among them, the above-mentioned fluid field parameters are used to indicate the motion state of the fluid, including turbulence models, insulating oil properties, and coupling surfaces of solids and fluids. Specifically, the turbulence model is a type of differential equation used to describe and simulate turbulent phenomena, but the present application does not specifically limit the differential equations in the turbulence model. The properties of insulating oil may include density, viscosity, and flash point, among which the insulating oil is transformer oil, which is a liquid compound produced based on petrochemical raw materials, and the present application does not specifically limit the properties of insulating oil. The coupling surface of solids and fluids refers to the interface between fluids and solids where they interact and exchange energy, momentum or mass, and the displacement, deformation, heat transfer and mass transfer processes of the fluid and solid are coupled to each other through this interface.

[0051] Furthermore, the steps of loading the grid information and setting the solver are the same as the steps in S102 above, and will not be repeated here. At the same time, the initial conditions of the fluid field can also be set in the simulation platform, for example, the initial temperature, pressure, velocity and other conditions in the fluid field, that is, the fluid field is initialized.

[0052] It should be noted that in the embodiment of the present application, a forced oil circulation transformer model can be selected to give an insulating oil circulation flow rate so that the insulating oil circulates inside the transformer and cools various components in the transformer.

[0053] In the simulation platform, after setting the solver as a transient solver, relevant solution parameters can be set in the solution to ensure that the fluid heat transfer process corresponding to the transformer can be accurately simulated based on the above parameters. Therefore, based on the above process, the fluid simulation model corresponding to each component in the transformer can be determined. The fluid simulation model is used to indicate how heat is transferred to the external environment through thermal convection.

[0054] It should be noted that the embodiment of the present application does not specifically limit the execution order of S102 and S103. The thermal field simulation model may be determined first, or the fluid simulation model may be determined first.

[0055] S104: Determine a fluid-solid coupling temperature field mathematical model corresponding to the transformer based on a thermal field simulation model, a fluid simulation model, a heat transfer control equation, and boundary conditions.

[0056] After determining the thermal field simulation model and the fluid simulation model, the mathematical model of the fluid-solid coupling temperature field corresponding to the transformer can be determined based on the thermal field simulation model and the fluid simulation model, combined with the heat transfer control equation and the boundary conditions. That is, coupling calculation is performed based on the thermal field simulation model and the fluid simulation model, that is, the mathematical model of the fluid-solid coupling temperature field is solved based on the solvers in the thermal field simulation model and the fluid simulation model. In the above-mentioned solving process, the heat transfer control equation and the boundary conditions can be combined to ensure the accuracy of the mathematical model of the fluid-solid coupling temperature field. The fluid-solid coupling temperature field data model is used to indicate the mathematical model for calculating the transformer temperature field by combining fluid and solid.

[0057] Since the heat generated by the transformer winding during operation mainly comes from the ohmic loss caused by the interaction between current and resistance, it is transferred from the inside to the winding surface in the form of heat conduction, and then transferred to the external environment in the form of heat convection after contacting the transformer oil. The temperature function in the energy conservation control equation of fluid heat transfer is affected by the comprehensive influence of oil velocity, density, constant pressure specific heat capacity, thermal conductivity, and heat load. The calculation formula of the two-dimensional field of fluid heat transfer can refer to the following formula 1.

[0058]

[0059] Wherein, the above p is the medium density, and its unit is kilogram per cubic meter kg / m 3 ;c v is the specific heat capacity of the medium, and its unit is the heat per kilogram of the substance when the temperature changes by 1 degree Celsius J / (kg·℃); u and v are the flow velocity components of the fluid medium in the horizontal coordinate x and vertical coordinate y directions in the two-dimensional coordinate system, and its unit is meter per second m / s; λ is the thermal conductivity of the medium, and its unit is the heat transferred through the substance per unit time per meter length and per degree Celsius temperature difference W / (m·℃); Q is the heat source density load, and its unit is the heat flow rate per unit volume W / m 3 ; T is the temperature function with respect to x, y and time t, and its unit is degree Celsius.

[0060] The two-dimensional transient thermal energy conservation control equation for solid heat transfer can be referred to Formula 2.

[0061]

[0062] The meaning of each character in the above formula 2 is the same as that of the character in formula 1, and will not be repeated here.

[0063] It should be noted that when the flow rate of the fluid is 0, the heat convection and heat conduction control equations are completely equivalent, that is, the heat convection control equation of the fluid can be expressed by the heat transfer control equation of the fluid. It is only necessary to distinguish the physical parameters of different media in the calculation domain, such as thermal conductivity, and the temperature distribution of the entire field inside the transformer can be solved by the heat conduction control equation. In other words, in the static fluid state, the heat transfer process can be calculated by heat conduction, thereby simplifying the analysis and modeling process.

[0064] Combined with the above heat transfer control equation, a transient fluid-solid coupling temperature field mathematical model can be established. Since the heat exchange between the transformer winding and the oil belongs to the heat transfer between the solid and the fluid, the wall continuity boundary condition can be introduced to solve the fluid-solid coupling calculation problem. Among them, the wall continuity boundary condition refers to the boundary where the fluid contacts the solid wall, and certain physical quantities of the fluid (such as velocity, temperature, etc.) need to meet certain continuity requirements. At the same time, the fluid-solid coupling calculation problem also involves temperature continuity conditions, heat flux continuity conditions, and first-class boundary conditions and third-class boundary conditions. The temperature continuity condition refers to the continuity of temperature inside an object or between objects (such as between a fluid and a solid wall) during the heat transfer process. For example, it requires that the temperature distribution is smooth and continuous in the physical space, and there will be no sudden changes or jumps in temperature. The heat flux continuity condition refers to the continuity of heat flux (i.e., the amount of heat passing through a unit area per unit time) within an object or between objects during the heat transfer process. For example, it requires that the heat flux cannot suddenly change at the boundary and should transition smoothly. The first type of boundary condition specifies the temperature value on the boundary of the object. When applying the first type of boundary condition, the temperature distribution on the boundary needs to be clearly specified. The third type of boundary condition refers to the natural convection boundary condition, which is used to indicate the heat exchange process between the boundary of the object and the surrounding fluid. When applying the third type of boundary condition, the surface heat transfer coefficient between the boundary of the object and the surrounding fluid and the temperature of the surrounding fluid need to be clearly specified.

[0065] Therefore, combining the above-mentioned wall continuity boundary conditions, temperature continuity conditions, heat flux continuity conditions, first-class boundary conditions and third-class boundary conditions, as well as the heat transfer control equations, it is determined that the mathematical model of the fluid-solid coupling temperature field corresponding to the transformer can be expressed by the equation group of Formula 3-Formula 7.

[0066]

[0067] Among them, the above formula 3 is the heat transfer control equation of fluid heat transfer, and formula 4 is the first type of boundary condition, that is, the temperature value of the given boundary Γ1 is T b , Formula 5 is the third type of boundary condition, that is, the temperature gradient value on the given boundary Γ3 and the boundary fluid temperature T f The relationship between x, y and time t is shown in Figure 2. T is the temperature function of x, y and time t, h is the convective heat transfer coefficient of the fluid, and its unit is the heat transferred through the substance per unit time per square meter and per degree Celsius temperature difference W / (m 2 ·℃), Formula 6 is the temperature continuity condition, Formula 7 is the heat flux continuity condition, λ a is the thermal conductivity of the transformer winding, λ b is the inlet coefficient of transformer oil, s a represents the solid interface, s b represents the fluid interface, sab It means that heat is transferred from a to b along the normal direction of the interface, and n is the normal direction outside the boundary.

[0068] S105: Calculate the temperature field of the transformer based on the fluid-solid coupling temperature field mathematical model and the load, perform order reduction processing and calculation on the temperature field of the transformer through the proxy model, and obtain a simulation result of the transformer temperature rise field.

[0069] When the mathematical model of the fluid-solid coupling temperature field is determined, the temperature field of different components in the transformer under various load rates can be calculated based on the mathematical model of the fluid-solid coupling temperature field. The load rate is the ratio of the actual load to the rated load of the transformer during operation. The temperature field of different components in the transformer is used to indicate the temperature changes of different components in the transformer.

[0070] Furthermore, the temperature field of different components in the transformer can be reduced and calculated through the proxy model, so that the calculation speed of the transformer digital twin model is greatly improved, so as to obtain the simulation results of the transformer temperature rise field. The transformer temperature rise field refers to the temperature rise of different components in the transformer. The proxy model refers to a technology that optimizes the calculation process by constructing a mathematical model with a small amount of calculation, a short calculation cycle, but a calculation result similar to the numerical analysis result without reducing the accuracy.

[0071] As an example, a radial basis function (RBF) can be used to construct a proxy model. In this regard, the present application does not specifically limit the method of constructing the proxy model. The proxy model constructed based on the radial basis function can refer to formula 8.

[0072]

[0073] In the above formula 8 represents the estimated value of the simulation result of the transformer temperature rise field, m is the order of the polynomial function, c j is the polynomial basis function p j The coefficient of (x), λ i Yes s indivual The weight coefficient, n s Refers to the number of sampling points (support points) used for interpolation or fitting, r(x,x i ) refers to x and x i The Euclidean distance between i is the supporting point, x is the point to be found, It refers to the radial basis function.

[0074] Since the proxy model can reduce the amount of calculation and the calculation cycle, the temperature field of the transformer is reduced and calculated based on the proxy model, and the simulation result of the transformer temperature rise field can be determined, thereby reducing the complexity of the model and the calculation workload, so as to improve the calculation efficiency of the transformer temperature rise field simulation calculation.

[0075] The above is a transformer temperature rise field simulation method provided by an embodiment of the present application. In this method, first, a simulation model corresponding to the transformer can be constructed based on the structure of the transformer. After that, a thermal simulation can be performed according to the simulation model corresponding to the transformer to determine the thermal field simulation model corresponding to the transformer, and a fluid simulation can also be performed according to the simulation model corresponding to the transformer to determine the fluid simulation model corresponding to the transformer. Since the heat generated by the transformer during operation mainly comes from the ohmic loss generated by the interaction between the current and the resistance, it is transferred from the inside to the winding surface of the transformer in the form of heat conduction, and after contacting the transformer oil, the heat will be transferred to the external environment in the form of heat convection, that is, the heat transfer process of the transformer component belongs to the heat transfer between the solid and the fluid. Therefore, based on the thermal field simulation model corresponding to the transformer and its fluid simulation model, combined with the heat transfer control equation and the boundary conditions, the fluid-solid coupling temperature field mathematical model corresponding to the transformer can be determined, so that the temperature field of the transformer can be calculated based on the fluid-solid coupling temperature field mathematical model that combines the solid and the fluid for coupling calculation and the load, so as to improve the accuracy of the temperature field calculation of the transformer digital twin model. In addition, the temperature field of the transformer can be reduced and calculated through the proxy model to obtain the simulation results of the transformer temperature rise field, so as to reduce the calculation workload and improve the calculation efficiency of the transformer temperature rise field simulation calculation.

[0076] Finally, the transformer temperature rise field simulation method provided in the embodiment of the present application is introduced as a whole by taking the clamp and pull plate parts of the transformer as examples.

[0077] First, a 1:1 equivalent three-dimensional simulation model of the transformer clamp and the pull plate can be established through the three-dimensional mechanical design software, and then the above three-dimensional simulation model can be imported into the thermal field module in the simulation platform to set the thermal field parameters, initialize and load the grid information, and at the same time, the solver can be set as a transient solver, and the relevant solution parameters can be set in the solver to determine the thermal field simulation model corresponding to each component of the transformer. In addition, the above three-dimensional simulation model can also be imported into the fluid simulation module in the simulation platform to set the fluid field parameters, initialize and load the grid information, and at the same time, the solver can be set as a transient solver, and the relevant solution parameters can be set in the solver to determine the fluid simulation model corresponding to each component of the transformer.

[0078] Furthermore, coupling calculations can be performed based on the thermal field simulation model and the fluid simulation model to determine a mathematical model of the fluid-solid coupling temperature field, that is, a set of equations of Formula 3 to Formula 7.

[0079] After that, different load rates can be set and the temperature conditions at different points in different temperature fields can be obtained by combining the above-mentioned fluid-solid coupling temperature field mathematical model. Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the simulation results of the temperature field of the pull plate under different load rates provided in the embodiment of the present application. Figure 2 The interface (a) in the figure is the temperature field simulation result of the pull plate with a load rate of 25%. Figure 2 Interface (b) in the figure is the temperature field simulation result of the pull plate with a load rate of 50%. Figure 2 Interface (c) in the figure is the temperature field simulation result of the pull-down plate with a load rate of 75%. Figure 2 The interface (d) in the figure is the temperature field simulation result of the pull-down plate with a load rate of 100%; Figure 3 This is a schematic diagram of the temperature field simulation results of the clamp under different load rates provided in the embodiment of the present application. Figure 3 The interface (a) in the figure is the temperature field simulation result of the clamp with a load rate of 25%. Figure 3 Interface (b) in the figure is the temperature field simulation result of the clamp with a load rate of 50%. Figure 3 Interface (c) in the figure is the temperature field simulation result of the lower clamp with a load rate of 75%. Figure 3 Interface (d) in FIG. 1 is the temperature field simulation result of the lower clamp with a load rate of 100%.

[0080] Finally, the temperature field results of different components calculated above can be input into Formula 8 for order reduction and calculation, and the component temperature field with a load rate of 120% can be obtained. The three-dimensional image of the transformer temperature field corresponding to the component temperature field with a load rate of 120% can be obtained through real-time rendering, that is, when the simulation results of the transformer temperature rise field are determined, the simulation results of the transformer temperature rise field are used to indicate the actual operating conditions of different components in the transformer, that is, the three-dimensional temperature field image of each component of the transformer can be visualized according to the actual operating conditions of different components in the transformer, thereby providing technical support and data support for transformer operation monitoring and fault diagnosis, and thus providing strong guarantee for ensuring the safe and stable operation of equipment. Figure 4 , Figure 4 A schematic diagram of a simulation rendering of a pull plate and a clamp with a load rate of 120% after the down-grading process provided in an embodiment of the present application. Figure 4 Interface (a) in the figure is a simulation rendering of the temperature rise field of the pull plate with a load rate of 120%. Figure 4Interface (b) in FIG. 1 is a schematic diagram of a simulation rendering of the temperature rise field of a clamp with a load rate of 120%.

[0081] The above are some specific implementations of the transformer temperature rise field simulation method provided by the embodiment of the present application. Based on this, the present application also provides a corresponding device. The device provided by the embodiment of the present application will be introduced from the perspective of functional modularization.

[0082] See also Figure 5 , which is a schematic diagram of the structure of a transformer temperature rise field simulation device 500 provided in an embodiment of the present application, and the device 500 may include:

[0083] A construction module 501 is used to construct a simulation model corresponding to the transformer based on the structure of the transformer;

[0084] A first determination module 502 is used to perform thermal simulation according to the simulation model corresponding to the transformer to determine the thermal field simulation model corresponding to the transformer;

[0085] A second determination module 503 is used to perform fluid simulation according to the simulation model corresponding to the transformer to determine the fluid simulation model corresponding to the transformer;

[0086] The third determination module 504 is used to determine the fluid-solid coupling temperature field mathematical model corresponding to the transformer based on the thermal field simulation model, the fluid simulation model, the heat transfer control equation, and the boundary conditions;

[0087] The calculation module 505 is used to calculate the temperature field of the transformer based on the fluid-solid coupling temperature field mathematical model and the load, and to reduce the order and calculate the temperature field of the transformer through the proxy model to obtain the simulation result of the transformer temperature rise field.

[0088] Optionally, the boundary conditions include wall continuity boundary conditions, first-type boundary conditions, and third-type boundary conditions, and the third determination module 504 includes:

[0089] The first determination unit is used to determine the fluid-solid coupling temperature field mathematical model corresponding to the transformer based on the thermal field simulation model, the fluid simulation model, the heat transfer control equation, the wall continuity condition, the first type of boundary condition and the third type of boundary condition.

[0090] Optionally, the device further includes: a construction unit, configured to construct a proxy model based on a radial basis function.

[0091] Optionally, the first determining module 502 includes:

[0092] The second determination unit is used to import the simulation model corresponding to the transformer into the simulation platform, set the thermal field parameters and load the grid information, set the solver to a transient solver, and determine the thermal field simulation model corresponding to the transformer.

[0093] Optionally, the second determining module 503 includes:

[0094] The third determination unit is used to import the simulation model corresponding to the transformer into the simulation platform, set the fluid field parameters and load the grid information, set the solver to a transient solver, and determine the fluid simulation model corresponding to the transformer.

[0095] Optionally, the thermal field parameters include: material properties, heat transfer parameters, and coupling surfaces of physical fields.

[0096] Optionally, the fluid field parameters include: a turbulence model, insulating oil properties, and a coupling surface between solid and fluid.

[0097] The embodiments of the present application also provide corresponding devices and computer storage media for implementing the solutions provided by the embodiments of the present application.

[0098] The device includes a memory and a processor, the memory is used to store a computer program, and the processor is used to execute the computer program, so that the device executes the transformer temperature rise field simulation method described in any embodiment of the present application.

[0099] The computer storage medium stores a computer program. When the code is executed, the device executing the computer program implements the transformer temperature rise field simulation method described in any embodiment of the present application.

[0100] The "first" and "second" in the names such as "first" and "second" (if any) mentioned in the embodiments of the present application are only used as name identifiers and do not represent the first or second in order.

[0101] Through the description of the above implementation methods, it can be known that those skilled in the art can clearly understand that all or part of the steps in the above-mentioned embodiment method can be implemented by means of software plus a general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a storage medium, such as a read-only memory (ROM) / RAM, a magnetic disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network communication device such as a router) to execute the methods described in each embodiment of the present application or some parts of the embodiments.

[0102] It should be noted that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The device embodiment described above is merely schematic, in which the unit described as a separate component may or may not be physically separated, and the component prompted as a unit may or may not be a physical unit, that is, it may be located in one place, or it may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0103] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A transformer temperature rise field simulation method, characterized in that: The method comprises: Based on the structure of the transformer, a simulation model corresponding to the transformer is constructed; Perform thermal simulation according to the simulation model corresponding to the transformer to determine the thermal field simulation model corresponding to the transformer; Perform fluid simulation according to the simulation model corresponding to the transformer to determine the fluid simulation model corresponding to the transformer; Determine a fluid-solid coupling temperature field mathematical model corresponding to the transformer based on the thermal field simulation model, the fluid simulation model, the heat transfer control equation, and the boundary conditions; The temperature field of the transformer is calculated based on the fluid-solid coupling temperature field mathematical model and the load, and the temperature field of the transformer is reduced and calculated through the proxy model to obtain the simulation result of the transformer temperature rise field.

2. The method according to claim 1, characterized in that The boundary conditions include wall continuity boundary conditions, first-class boundary conditions, and third-class boundary conditions. The fluid-solid coupling temperature field mathematical model corresponding to the transformer is determined based on the thermal field simulation model, the fluid simulation model, the heat transfer control equation, and the boundary conditions, including: Based on the thermal field simulation model, the fluid simulation model, the heat transfer control equation, the wall continuity condition, the first type of boundary condition and the third type of boundary condition, a fluid-solid coupling temperature field mathematical model corresponding to the transformer is determined.

3. The method according to claim 1, characterized in that The method further includes: constructing a proxy model based on a radial basis function.

4. The method according to claim 1, characterized in that: The performing thermal simulation according to the simulation model corresponding to the transformer to determine the thermal field simulation model corresponding to the transformer includes: The simulation model corresponding to the transformer is imported into the simulation platform, the thermal field parameters are set and the grid information is loaded, the solver is set as a transient solver, and the thermal field simulation model corresponding to the transformer is determined.

5. The method according to claim 1, characterized in that The performing fluid simulation according to the simulation model corresponding to the transformer to determine the fluid simulation model corresponding to the transformer includes: The simulation model corresponding to the transformer is imported into the simulation platform, the fluid field parameters are set and the grid information is loaded, the solver is set as a transient solver, and the fluid simulation model corresponding to the transformer is determined.

6. The method according to claim 4, characterized in that The thermal field parameters include: material properties, heat transfer parameters, and coupling surfaces of physical fields.

7. The method according to claim 5, characterized in that The fluid field parameters include: turbulence model, insulating oil properties, and coupling surfaces between solid and fluid.

8. A transformer temperature rise field simulation device, characterized in that: The device comprises: A construction module, used for constructing a simulation model corresponding to the transformer based on the structure of the transformer; A first determination module is used to perform thermal simulation according to the simulation model corresponding to the transformer to determine the thermal field simulation model corresponding to the transformer; A second determination module is used to perform fluid simulation according to the simulation model corresponding to the transformer to determine the fluid simulation model corresponding to the transformer; A third determination module is used to determine a fluid-solid coupling temperature field mathematical model corresponding to the transformer based on the thermal field simulation model, the fluid simulation model, the heat transfer control equation, and the boundary conditions; The calculation module is used to calculate the temperature field of the transformer based on the fluid-solid coupling temperature field mathematical model and the load, and to reduce the order and calculate the temperature field of the transformer through the proxy model to obtain the simulation result of the transformer temperature rise field.

9. A transformer temperature rise field simulation device, characterized in that: The device comprises: Memory for storing computer programs; A processor is used to execute the computer program so that the device performs the transformer temperature rise field simulation method according to any one of claims 1 to 7.

10. A computer storage medium, characterized in that: The computer storage medium stores a computer program, and when the computer program is executed by a processor, the transformer temperature rise field simulation method according to any one of claims 1 to 7 is implemented.

Images