Transformer full model temperature field calculation method and system based on equivalent boundary

Abstract

The present invention relates to the technical field of temperature field calculation, and discloses a method and system for calculating the temperature field of a transformer full model based on an equivalent boundary. The structure of a transformer winding is simplified, and the temperature field distributions corresponding to the semi-equivalent model and the equivalent model of the simplified transformer winding are made consistent with the precise temperature field distribution under a preset precise simulation calculation model, thereby improving the temperature field calculation efficiency and equivalently calculating the temperature field distribution under the complex structure of the transformer. The three-dimensional full model of the transformer is updated in sequence through the equivalent model, the semi-equivalent model and the precise simulation calculation model of the transformer winding, thereby obtaining a higher-precision temperature field distribution of the transformer and improving the accuracy of the temperature field calculation of the transformer.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature field calculation, and in particular to a method and system for calculating the temperature field of a transformer full model based on equivalent boundaries. Background Art

[0002] Transformers are key equipment and important nodes in the operation of large power grids. The rationality of their structural optimization design, the uniformity of multi-physics field distribution, and the effectiveness of operation monitoring are of great significance to their safe and stable operation throughout their life cycle. Hot spot temperature rise is a key indicator for transformer design and operation and maintenance. Multi-physics field simulation calculation methods are often used for solution analysis. By giving reasonable boundary conditions and loads, etc., it is determined whether the oil channel design, material selection, and overall structure of the transformer winding meet the relevant thermal performance requirements.

[0003] With the transformation of new power systems, more and more attention is paid to the analysis of transformer operating status. Combining simulation of multi-physical field distribution can provide good support for transformer hotspot analysis and is a technical means that is currently receiving widespread attention.

[0004] Due to the complex structure of transformer windings, if a three-dimensional model is directly used when constructing a multi-physics field simulation calculation model, it will make it difficult to divide the grid for numerical calculations, which often causes data divergence in the calculation process and makes it difficult to obtain accurate calculation results.

[0005] Most existing technical solutions use highly simplified models, but do not fully consider the complex structure of the transformer, which can easily lead to inaccurate calculation of the transformer's temperature field and large errors in the temperature field calculation results. Summary of the invention

[0006] The present invention provides a method and system for calculating the temperature field of a full transformer model based on equivalent boundaries, which solves the technical problem that the existing technical solutions mostly use highly simplified models but do not fully consider the complex structure of the transformer, which easily leads to inaccurate temperature field calculation of the transformer and large errors in the temperature field calculation results.

[0007] In view of this, a first aspect of the present invention provides a method for calculating the temperature field of a transformer full model based on an equivalent boundary, comprising:

[0008] Obtain the precise temperature field distribution of the transformer winding under the preset precise simulation calculation model;

[0009] Simplifying the structure of the transformer winding, and constructing a semi-equivalent model and an equivalent model of the transformer winding respectively, and making the temperature field distributions corresponding to the semi-equivalent model and the equivalent model of the transformer winding respectively consistent with the precise temperature field distribution;

[0010] Updating the preset three-dimensional full model of the transformer for the first time according to the equivalent model of the transformer winding, and performing temperature field simulation calculation on the three-dimensional full model of the transformer after the first update to obtain the temperature field distribution of the transformer after the first update;

[0011] The preset three-dimensional full model of the transformer is updated for a second time according to the semi-equivalent model of the transformer winding, the temperature field distribution of the transformer after the first update is used as the initial value of the temperature field calculation, and the temperature field simulation calculation is performed on the three-dimensional full model of the transformer after the second update to obtain the temperature field distribution of the transformer after the second update;

[0012] The preset three-dimensional full model of the transformer is updated for the third time according to the preset precise simulation calculation model of the transformer winding, the temperature field distribution of the transformer after the second update is used as the initial value of the temperature field calculation, and the temperature field simulation calculation is performed on the three-dimensional full model of the transformer after the third update to obtain the temperature field distribution of the transformer.

[0013] Preferably, the step of obtaining the precise temperature field distribution of the transformer winding under a preset precise simulation calculation model specifically includes:

[0014] Performing refined simulation modeling according to the structure of the transformer winding to construct a geometric simulation model of the transformer winding;

[0015] Determine the loss of each pancake coil according to the current flowing through each pancake coil in the geometric simulation model of the transformer winding;

[0016] The heat sources of all coils of the transformer winding are set according to the loss of each coil, the boundary conditions are set according to the preset convection heat transfer coefficient and temperature value of each path, and an accurate simulation calculation model of the transformer winding is constructed;

[0017] The temperature field simulation calculation is performed through the accurate simulation calculation model of the transformer winding to obtain the accurate temperature field distribution.

[0018] Preferably, the step of simplifying the structure of the transformer winding, respectively constructing a semi-equivalent model and an equivalent model of the transformer winding, and making the temperature field distributions corresponding to the semi-equivalent model and the equivalent model of the transformer winding respectively consistent with the precise temperature field distribution comprises:

[0019] The winding coils of the transformer winding are equivalently simplified into the same material model, and a semi-equivalent model of the transformer winding is established;

[0020] The heat source of each pancake coil in the preset accurate simulation calculation model of the transformer winding is loaded onto the coil at the corresponding position in the semi-equivalent model of the transformer winding, and the boundary conditions of the semi-equivalent model of the transformer winding and the preset accurate simulation calculation model of the transformer winding are set to be the same;

[0021] Initialize the material parameters of the winding coil in the semi-equivalent model of the transformer winding, and continuously adjust the material parameters of the winding coil so that the temperature field distribution of the transformer winding under the semi-equivalent model is consistent with the precise temperature field distribution.

[0022] Preferably, the step of simplifying the structure of the transformer winding, respectively constructing a semi-equivalent model and an equivalent model of the transformer winding, and making the temperature field distributions corresponding to the semi-equivalent model and the equivalent model of the transformer winding respectively consistent with the precise temperature field distribution comprises:

[0023] The winding coils and oil passages of the transformer winding are equivalently simplified into the same material model, and an equivalent model of the transformer winding is established;

[0024] The heat source of each pancake coil in the preset accurate simulation calculation model of the transformer winding is loaded onto the coil at the corresponding position in the equivalent model of the transformer winding, and the boundary conditions of the equivalent model of the transformer winding and the preset accurate simulation calculation model of the transformer winding are set to be the same;

[0025] Initialize the material parameters of the winding coil and the oil channel in the equivalent model of the transformer winding, and continuously adjust the material parameters of the winding coil and the oil channel so that the temperature field distribution of the transformer winding under the equivalent model is consistent with the precise temperature field distribution.

[0026] Preferably, before the preset three-dimensional full model of the transformer is updated, it also includes: rotating the equivalent model of the transformer winding, the semi-equivalent model of the transformer winding or the preset accurate simulation calculation model of the transformer winding from a two-dimensional axisymmetric model to a three-dimensional structure, wherein the preset three-dimensional full model of the transformer is a three-dimensional structural model obtained by simulating and modeling the structure of the transformer.

[0027] Preferably, after the step of updating the preset three-dimensional full transformer model for the second time according to the semi-equivalent model of the transformer winding, taking the temperature field distribution of the transformer after the first update as the initial value of the temperature field calculation, and performing temperature field simulation calculation on the three-dimensional full transformer model after the second update to obtain the temperature field distribution of the transformer after the second update, the method further includes:

[0028] According to the temperature field distribution of the transformer after the second update, the boundary conditions of the transformer winding are extracted by cross-section, and the boundary conditions of the transformer winding are set as the boundary conditions of the preset accurate simulation calculation model of the transformer winding, and the temperature field simulation calculation is performed on the preset accurate simulation calculation model of the transformer winding to obtain the temperature field distribution of the transformer winding.

[0029] In a second aspect, the present invention further provides a transformer full model temperature field calculation system based on equivalent boundaries, comprising:

[0030] The precise temperature field simulation module is used to obtain the precise temperature field distribution of the transformer winding under the preset precise simulation calculation model;

[0031] A model simplification module, used to simplify the structure of the transformer winding, and respectively construct a semi-equivalent model and an equivalent model of the transformer winding, and make the temperature field distributions corresponding to the semi-equivalent model and the equivalent model of the transformer winding respectively consistent with the precise temperature field distribution;

[0032] A first model updating module, used for updating a preset three-dimensional full model of the transformer for the first time according to the equivalent model of the transformer winding, and performing temperature field simulation calculation on the three-dimensional full model of the transformer after the first update to obtain the temperature field distribution of the transformer after the first update;

[0033] A second model updating module is used to update the preset three-dimensional full model of the transformer for a second time according to the semi-equivalent model of the transformer winding, take the temperature field distribution of the transformer after the first update as the initial value of the temperature field calculation, and perform temperature field simulation calculation on the three-dimensional full model of the transformer after the second update to obtain the temperature field distribution of the transformer after the second update;

[0034] The third model updating module is used to update the preset three-dimensional full model of the transformer for the third time according to the preset precise simulation calculation model of the transformer winding, use the temperature field distribution of the transformer after the second update as the initial value of the temperature field calculation, and perform temperature field simulation calculation on the three-dimensional full model of the transformer after the third update to obtain the temperature field distribution of the transformer.

[0035] In a third aspect, the present invention further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the above-mentioned method for calculating the temperature field of the full model of the transformer based on the equivalent boundary.

[0036] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, which, when executed, implements the steps of the method for calculating the temperature field of the full transformer model based on equivalent boundaries as described above.

[0037] In a fifth aspect, the present invention also provides a computer program product, comprising a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program comprises program instructions, wherein when the program instructions are executed by a computer, the computer executes the steps of the method for calculating the temperature field of the full model of a transformer based on equivalent boundaries as described above.

[0038] It can be seen from the above technical solutions that the present invention has the following advantages:

[0039] The present invention simplifies the structure of the transformer winding, and makes the temperature field distributions corresponding to the semi-equivalent model and the equivalent model of the simplified transformer winding consistent with the precise temperature field distribution under the preset precise simulation calculation model, thereby improving the temperature field calculation efficiency and equivalently achieving the temperature field distribution under the complex structure of the transformer. The three-dimensional full model of the transformer is updated in sequence through the equivalent model, the semi-equivalent model and the precise simulation calculation model of the transformer winding, thereby obtaining a higher-precision temperature field distribution of the transformer and improving the accuracy of the temperature field calculation of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A flowchart of a method for calculating temperature field of a transformer full model based on equivalent boundaries provided by an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the structure of an accurate simulation calculation model for transformer windings provided in an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of the structure of a semi-equivalent model of a transformer winding provided in an embodiment of the present invention;

[0043] Figure 4 A schematic diagram of the structure of an equivalent model of a transformer winding provided by an embodiment of the present invention;

[0044] Figure 5 A schematic diagram of the structure of the updated three-dimensional full model of the transformer provided in an embodiment of the present invention;

[0045] Figure 6 A schematic diagram of the structure of a transformer full model temperature field calculation system based on equivalent boundaries provided in an embodiment of the present invention;

[0046] Figure 7 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0049] Due to the complex structure of transformer windings, if a three-dimensional model is directly used when constructing a multi-physics field simulation calculation model, it will make it difficult to divide the grid for numerical calculations, which often causes data divergence in the calculation process and makes it difficult to obtain accurate calculation results.

[0050] Most of the existing technical solutions use highly simplified models. One type is a two-dimensional axisymmetric model. By building a refined two-dimensional model of the transformer winding, including each coil, end angle ring, baffle, oil channel, etc. of the transformer, it is built 1:1 with the design drawing. Based on this model, the temperature and convection heat transfer coefficient are applied to its boundary, and corresponding loads are applied to the inlet and outlet of the oil channel for calculation. However, applying temperature and convection heat transfer coefficient to the transformer boundary is often inaccurate. Since the transformer is a three-dimensional structure, the temperature and convection heat transfer coefficient of the coil boundary are often affected by the adjacent coils, iron core, and transformer oil tank. The inlet flow rate and temperature, and outlet pressure also have such problems.

[0051] The second type is to use a three-dimensional model to equate the transformer winding to a cylinder. The loss of each transformer cake is directly and evenly equivalent to the cylinder. The distribution of coil cakes and oil channels in the winding is not considered, and the temperature field distribution is directly obtained through the calculation of the three-dimensional model. However, this scheme is difficult to consider the temperature rise of each winding in detail. In addition, the oil channels between each cake winding cannot be considered, and simplifications such as screens will also cause errors in the calculation results.

[0052] Therefore, the existing solutions do not fully consider the complex structure of the transformer, which easily leads to inaccurate calculation of the temperature field of the transformer and large errors in the temperature field calculation results.

[0053] In view of this, an embodiment of the present invention provides a method for calculating the temperature field of a full model of a transformer based on an equivalent boundary. This embodiment can be applicable to the case of calculating the temperature field of a full model of a transformer. The method can be executed by a full model temperature field calculation device for a transformer. The full model temperature field calculation device for a transformer can be implemented in the form of hardware and / or software. The full model temperature field calculation device for a transformer can be configured in a computer device.

[0054] like Figure 1 As shown, an embodiment of the present invention provides a method for calculating the temperature field of a transformer full model based on an equivalent boundary, comprising:

[0055] Step S1, obtaining the precise temperature field distribution of the transformer winding under a preset precise simulation calculation model.

[0056] Among them, the accurate simulation calculation model of the transformer winding is as follows Figure 2 As shown, the accurate simulation calculation model of the transformer winding is a two-dimensional model under two-dimensional axisymmetric conditions.

[0057] Specifically, step S1 includes:

[0058] Step S101: Perform refined simulation modeling according to the structure of the transformer winding to construct a geometric simulation model of the transformer winding.

[0059] Step S102: Determine the loss of each coil according to the current flowing through each coil in the geometric simulation model of the transformer winding.

[0060] In the finite element calculation, the corresponding material conductivity parameters and current-carrying current are set for the transformer winding. According to the current flowing through each coil, the loss of each coil is calculated as the heat source for temperature field calculation.

[0061] Step S103, setting the heat source of all coils of the transformer winding according to the loss of each coil, setting the boundary conditions according to the preset convection heat transfer coefficient and temperature value of each path, and constructing an accurate simulation calculation model of the transformer winding.

[0062] Among them, Figure 2As shown in the figure, the simulation boundary of the transformer winding includes paths 1 to 5. The convective heat transfer coefficient and temperature value of each path are given. At this time, the value is selected as the estimated value, and the estimated values ​​of the outlet and inlet are given as boundary conditions. The estimated value is an empirical value, and generally there is a value that can be selected. For example, the thermal conductivity of the transformer oil is selected to derive the equivalent of the convective heat transfer coefficient, and the temperature value can be selected from 40℃ to 60℃ based on previous design experience.

[0063] Among them, the precise simulation calculation model of the transformer winding has carried out detailed modeling of the transformer winding, including the winding coil, the wrapped insulating paper and the oil channels between the windings.

[0064] Step S104: Perform temperature field simulation calculation using the precise simulation calculation model of the transformer winding to obtain precise temperature field distribution.

[0065] Step S2, simplifying the structure of the transformer winding, and constructing a semi-equivalent model and an equivalent model of the transformer winding respectively, and making the temperature field distribution corresponding to the semi-equivalent model and the equivalent model of the transformer winding respectively consistent with the precise temperature field distribution.

[0066] Specifically, constructing a semi-equivalent model of the transformer winding includes:

[0067] Step S201: The winding coils of the transformer winding are equivalently simplified into the same material model to establish a semi-equivalent model of the transformer winding.

[0068] Among them, Figure 3 As shown, Figure 3 The structure of the semi-equivalent model of the transformer winding is illustrated. The difference between the semi-equivalent model of the transformer winding and the accurate simulation calculation model of the transformer winding is that the winding coil is simplified and equivalent to a blank rectangular block.

[0069] Step S202, the heat source of each pancake coil in the preset precise simulation calculation model of the transformer winding is loaded onto the coil at the corresponding position in the semi-equivalent model of the transformer winding, and the boundary conditions of the semi-equivalent model of the transformer winding are set to be the same as those of the preset precise simulation calculation model of the transformer winding.

[0070] Among them, the heat source load of the winding in the semi-equivalent model of the transformer winding is loaded according to the coordinates of each pancake of the accurate simulation calculation model to load the heat source of each pancake coil.

[0071] Step S203, initializing the material parameters of the winding coil in the semi-equivalent model of the transformer winding, and continuously adjusting the material parameters of the winding coil so that the temperature field distribution of the transformer winding in the semi-equivalent model is consistent with the precise temperature field distribution.

[0072] Among them, the material parameters of the winding coil in the semi-equivalent model of the transformer winding are initialized and set to the estimated material parameters, the temperature field distribution of the transformer winding is calculated, and the material parameters (heat capacity and thermal conductivity) of the winding in the semi-equivalent model are adjusted to make the temperature field distribution of the transformer winding under the semi-equivalent model consistent with the precise temperature field distribution.

[0073] Among them, building the equivalent model of the transformer winding includes:

[0074] Step S211: The winding coils and oil channels of the transformer winding are equivalently simplified into the same material model to establish an equivalent model of the transformer winding.

[0075] Among them, the equivalent model of the transformer winding is as follows: Figure 4 As shown in FIG. 1 , the equivalent model equates the winding coil and oil channel of the transformer winding to a rectangular block and uses equivalent thermal conductivity for calculation.

[0076] Step S212, according to the preset accurate simulation calculation model of the transformer winding, the heat source of each pancake coil is loaded onto the coil at the corresponding position in the equivalent model of the transformer winding, and the boundary conditions of the equivalent model of the transformer winding and the preset accurate simulation calculation model of the transformer winding are set to be the same;

[0077] Step S213, initializing the material parameters of the winding coils and oil channels in the equivalent model of the transformer winding, and continuously adjusting the material parameters of the winding coils and oil channels so that the temperature field distribution of the transformer winding under the equivalent model is consistent with the precise temperature field distribution.

[0078] Step S3, updating the preset three-dimensional full transformer model for the first time according to the equivalent model of the transformer winding, and performing temperature field simulation calculation on the three-dimensional full transformer model after the first update to obtain the temperature field distribution of the transformer after the first update.

[0079] Before the preset three-dimensional full model of the transformer is updated, the method further includes: rotating the equivalent model of the transformer winding from a two-dimensional axisymmetric structure to a three-dimensional structure.

[0080] Update the three-dimensional structure of the equivalent model of the transformer winding to the preset three-dimensional full transformer model, such as Figure 5 As shown, the preset transformer three-dimensional full model is a three-dimensional structural model obtained by simulating and modeling the structure of the transformer. When the temperature field simulation calculation is performed on the transformer three-dimensional full model after the first update, the temperature estimation value is used as the initial value of the temperature field calculation.

[0081] Step S4, updating the preset three-dimensional full transformer model for a second time according to the semi-equivalent model of the transformer winding, taking the temperature field distribution of the transformer after the first update as the initial value of the temperature field calculation, and performing temperature field simulation calculation on the three-dimensional full transformer model after the second update to obtain the temperature field distribution of the transformer after the second update.

[0082] Before the preset three-dimensional full model of the transformer is updated, the method further includes: rotating the semi-equivalent model of the transformer winding from a two-dimensional axisymmetric structure to a three-dimensional structure.

[0083] It can be understood that when performing temperature field simulation calculation on the three-dimensional full model of the transformer after the second update, using the temperature field distribution of the transformer after the first update as the initial value of the temperature field calculation can accelerate the solution convergence speed and convergence of the semi-equivalent model and improve the calculation efficiency.

[0084] Step S5, updating the preset three-dimensional full transformer model for the third time according to the preset precise simulation calculation model of the transformer winding, taking the temperature field distribution of the transformer after the second update as the initial value of the temperature field calculation, and performing temperature field simulation calculation on the three-dimensional full transformer model after the third update to obtain the temperature field distribution of the transformer.

[0085] Among them, before the preset transformer three-dimensional full model is updated, it also includes: rotating the preset accurate simulation calculation model of the transformer winding from a two-dimensional axisymmetric structure to a three-dimensional structure. By performing temperature field simulation calculation on the transformer three-dimensional full model after the third update, a more accurate temperature field distribution of the transformer can be obtained.

[0086] In addition, since the temperature field distribution of the transformer mainly studies the temperature field distribution of the transformer winding, the embodiment of the present invention obtains the temperature field distribution of the transformer after the semi-equivalent model of the transformer winding is updated. Since the temperature field distribution obtained this time is the temperature field distribution under the three-dimensional structure, the cross-section of the temperature field distribution obtained this time can be extracted, as shown in the following figure. Figure 2 The boundary conditions of the transformer winding under two-dimensional axisymmetric conditions mentioned in .

[0087] To this end, after step S4, the following steps are further included:

[0088] According to the temperature field distribution of the transformer after the second update, the boundary conditions of the transformer winding are extracted by cross section, and the boundary conditions of the transformer winding are set as the boundary conditions of the preset accurate simulation calculation model of the transformer winding. The preset accurate simulation calculation model of the transformer winding is used for temperature field simulation calculation to obtain the temperature field distribution of the transformer winding.

[0089] It should be noted that the embodiment of the present invention simplifies the structure of the transformer winding, and makes the temperature field distribution corresponding to the simplified semi-equivalent model and equivalent model of the transformer winding consistent with the precise temperature field distribution under the preset precise simulation calculation model, thereby improving the temperature field calculation efficiency and equivalent to the temperature field distribution under the complex structure of the transformer. The three-dimensional full model of the transformer is updated in sequence through the equivalent model, semi-equivalent model and precise simulation calculation model of the transformer winding, so as to obtain a higher-precision temperature field distribution of the transformer, thereby improving the accuracy of the temperature field calculation of the transformer.

[0090] The above is a detailed description of an embodiment of a method for calculating the temperature field of a full transformer model based on an equivalent boundary provided by the present invention. The following is a detailed description of an embodiment of a system for calculating the temperature field of a full transformer model based on an equivalent boundary provided by the present invention.

[0091] like Figure 6 As shown, an embodiment of the present invention further provides a transformer full model temperature field calculation system based on equivalent boundaries, comprising:

[0092] The precise temperature field simulation module 100 is used to obtain the precise temperature field distribution of the transformer winding under a preset precise simulation calculation model;

[0093] The model simplification module 200 is used to simplify the structure of the transformer winding, and respectively construct a semi-equivalent model and an equivalent model of the transformer winding, and make the temperature field distribution corresponding to the semi-equivalent model and the equivalent model of the transformer winding consistent with the accurate temperature field distribution;

[0094] The first model updating module 300 is used to update the preset three-dimensional full model of the transformer for the first time according to the equivalent model of the transformer winding, and perform temperature field simulation calculation on the three-dimensional full model of the transformer after the first update to obtain the temperature field distribution of the transformer after the first update;

[0095] The second model updating module 400 is used to update the preset three-dimensional full model of the transformer for the second time according to the semi-equivalent model of the transformer winding, take the temperature field distribution of the transformer after the first update as the initial value of the temperature field calculation, and perform temperature field simulation calculation on the three-dimensional full model of the transformer after the second update to obtain the temperature field distribution of the transformer after the second update;

[0096] The third model updating module 500 is used to update the preset three-dimensional full model of the transformer for the third time according to the preset accurate simulation calculation model of the transformer winding, use the temperature field distribution of the transformer after the second update as the initial value of the temperature field calculation, and perform temperature field simulation calculation on the three-dimensional full model of the transformer after the third update to obtain the temperature field distribution of the transformer.

[0097] like Figure 7 As shown, an embodiment of the present invention further provides an electronic device, the electronic device 10 includes a memory 20 and a processor 30, the memory 20 stores a computer program, and when the computer program is executed by the processor 30, the processor 30 executes the steps of the transformer full model temperature field calculation method based on equivalent boundaries in any of the above embodiments.

[0098] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed, the steps of the method for calculating the temperature field of the full model of a transformer based on equivalent boundaries in any of the above embodiments are implemented.

[0099] An embodiment of the present invention also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the steps of the method for calculating the temperature field of the full model of a transformer based on equivalent boundaries in any of the above embodiments.

[0100] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, electronic devices, computer storage media and computer program products can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0101] In several embodiments provided by the present invention, it is understood that each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved.

[0102] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, electronic devices, computer storage media, computer program products and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0103] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0104] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0105] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for executing all or part of the steps of the method described in each embodiment of the present invention through a computer device (which can be a personal computer, server, or network device, etc.). The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[0106] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for calculating the temperature field of a transformer full model based on equivalent boundaries, characterized in that: include: Obtain the precise temperature field distribution of the transformer winding under the preset precise simulation calculation model, including: Performing refined simulation modeling according to the structure of the transformer winding to construct a geometric simulation model of the transformer winding; Determine the loss of each pancake coil according to the current flowing through each pancake coil in the geometric simulation model of the transformer winding; The heat sources of all coils of the transformer winding are set according to the loss of each coil, the boundary conditions are set according to the preset convection heat transfer coefficient and temperature value of each path, and an accurate simulation calculation model of the transformer winding is constructed; Perform temperature field simulation calculation using the precise simulation calculation model of the transformer winding to obtain precise temperature field distribution; The structure of the transformer winding is simplified, and a semi-equivalent model and an equivalent model of the transformer winding are respectively constructed, and the temperature field distributions corresponding to the semi-equivalent model of the transformer winding and the equivalent model are made consistent with the precise temperature field distribution; wherein the winding coils of the transformer winding are equivalently simplified to the same material model, and a semi-equivalent model of the transformer winding is established; The winding coils and oil passages of the transformer winding are equivalently simplified into the same material model, and an equivalent model of the transformer winding is established; The preset three-dimensional full model of the transformer is updated for the first time according to the equivalent model of the transformer winding, and the temperature field simulation calculation is performed on the three-dimensional full model of the transformer after the first update to obtain the temperature field distribution of the transformer after the first update; The preset three-dimensional full model of the transformer is updated for a second time according to the semi-equivalent model of the transformer winding, the temperature field distribution of the transformer after the first update is used as the initial value of the temperature field calculation, and the temperature field simulation calculation is performed on the three-dimensional full model of the transformer after the second update to obtain the temperature field distribution of the transformer after the second update; The preset three-dimensional full model of the transformer is updated for the third time according to the preset precise simulation calculation model of the transformer winding, the temperature field distribution of the transformer after the second update is used as the initial value of the temperature field calculation, and the temperature field simulation calculation is performed on the three-dimensional full model of the transformer after the third update to obtain the temperature field distribution of the transformer.

2. The transformer full model temperature field calculation method based on equivalent boundary according to claim 1 is characterized in that: The step of simplifying the structure of the transformer winding, respectively constructing a semi-equivalent model and an equivalent model of the transformer winding, and making the temperature field distributions corresponding to the semi-equivalent model and the equivalent model of the transformer winding respectively consistent with the precise temperature field distribution also includes: The heat source of each pancake coil in the preset accurate simulation calculation model of the transformer winding is loaded onto the coil at the corresponding position in the semi-equivalent model of the transformer winding, and the boundary conditions of the semi-equivalent model of the transformer winding and the preset accurate simulation calculation model of the transformer winding are set to be the same; Initialize the material parameters of the winding coil in the semi-equivalent model of the transformer winding, and continuously adjust the material parameters of the winding coil so that the temperature field distribution of the transformer winding under the semi-equivalent model is consistent with the precise temperature field distribution.

3. The transformer full model temperature field calculation method based on equivalent boundary according to claim 2 is characterized in that: The step of simplifying the structure of the transformer winding, respectively constructing a semi-equivalent model and an equivalent model of the transformer winding, and making the temperature field distributions corresponding to the semi-equivalent model and the equivalent model of the transformer winding respectively consistent with the precise temperature field distribution also includes: The heat source of each pancake coil in the preset accurate simulation calculation model of the transformer winding is loaded onto the coil at the corresponding position in the equivalent model of the transformer winding, and the boundary conditions of the equivalent model of the transformer winding and the preset accurate simulation calculation model of the transformer winding are set to be the same; Initialize the material parameters of the winding coil and the oil channel in the equivalent model of the transformer winding, and continuously adjust the material parameters of the winding coil and the oil channel so that the temperature field distribution of the transformer winding under the equivalent model is consistent with the precise temperature field distribution.

4. The transformer full model temperature field calculation method based on equivalent boundary according to claim 1 is characterized in that: Before the preset three-dimensional full model of the transformer is updated, it also includes: rotating the equivalent model of the transformer winding, the semi-equivalent model of the transformer winding or the preset accurate simulation calculation model of the transformer winding from a two-dimensional axisymmetric model to a three-dimensional structure, wherein the preset three-dimensional full model of the transformer is a three-dimensional structural model obtained by simulating and modeling the structure of the transformer.

5. The transformer full model temperature field calculation method based on equivalent boundary according to claim 1 is characterized in that: After the step of updating the preset three-dimensional full transformer model for the second time according to the semi-equivalent model of the transformer winding, taking the temperature field distribution of the transformer after the first update as the initial value of the temperature field calculation, and performing temperature field simulation calculation on the three-dimensional full transformer model after the second update to obtain the temperature field distribution of the transformer after the second update, the method further includes: According to the temperature field distribution of the transformer after the second update, the boundary conditions of the transformer winding are extracted by cross-section, and the boundary conditions of the transformer winding are set as the boundary conditions of the preset accurate simulation calculation model of the transformer winding, and the temperature field simulation calculation is performed on the preset accurate simulation calculation model of the transformer winding to obtain the temperature field distribution of the transformer winding.

6. A transformer full model temperature field calculation system based on equivalent boundary, characterized in that: include: The precise temperature field simulation module is used to obtain the precise temperature field distribution of the transformer winding under the preset precise simulation calculation model, including: Performing refined simulation modeling according to the structure of the transformer winding to construct a geometric simulation model of the transformer winding; Determine the loss of each pancake coil according to the current flowing through each pancake coil in the geometric simulation model of the transformer winding; The heat sources of all coils of the transformer winding are set according to the loss of each coil, the boundary conditions are set according to the preset convection heat transfer coefficient and temperature value of each path, and an accurate simulation calculation model of the transformer winding is constructed; Perform temperature field simulation calculation using the precise simulation calculation model of the transformer winding to obtain precise temperature field distribution; A model simplification module is used to simplify the structure of the transformer winding, and respectively construct a semi-equivalent model and an equivalent model of the transformer winding, and make the temperature field distributions corresponding to the semi-equivalent model of the transformer winding and the equivalent model respectively consistent with the precise temperature field distribution; wherein, the winding coils of the transformer winding are equivalently simplified to the same material model to establish the semi-equivalent model of the transformer winding; the winding coils and oil channels of the transformer winding are equivalently simplified to the same material model to establish the equivalent model of the transformer winding; A first model updating module, used for updating a preset three-dimensional full model of the transformer for the first time according to the equivalent model of the transformer winding, and performing temperature field simulation calculation on the three-dimensional full model of the transformer after the first update to obtain the temperature field distribution of the transformer after the first update; A second model updating module is used to update the preset three-dimensional full model of the transformer for a second time according to the semi-equivalent model of the transformer winding, take the temperature field distribution of the transformer after the first update as the initial value of the temperature field calculation, and perform temperature field simulation calculation on the three-dimensional full model of the transformer after the second update to obtain the temperature field distribution of the transformer after the second update; The third model updating module is used to update the preset three-dimensional full model of the transformer for the third time according to the preset precise simulation calculation model of the transformer winding, use the temperature field distribution of the transformer after the second update as the initial value of the temperature field calculation, and perform temperature field simulation calculation on the three-dimensional full model of the transformer after the third update to obtain the temperature field distribution of the transformer.

7. An electronic device, characterized in that: The electronic device includes a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the method for calculating the temperature field of the full model of a transformer based on equivalent boundaries as described in any one of claims 1 to 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the steps of the method for calculating the temperature field of the full model of a transformer based on equivalent boundaries as described in any one of claims 1 to 5 are implemented.

9. A computer program product, characterized in that The computer program product includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer is caused to execute the steps of the method for calculating the temperature field of the full model of a transformer based on equivalent boundaries as described in any one of claims 1 to 5.

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