Self-cooling transformer oil flow heat dissipation optimization method, device and storage medium

Abstract

The present application relates to a method, device, and storage medium for optimizing the oil flow heat dissipation of an air-cooled transformer. The method for optimizing the oil flow heat dissipation of the air-cooled transformer includes: obtaining the structural parameters of the air-cooled transformer and the operating condition parameters of the air-cooled transformer; constructing a three-dimensional geometric model of the air-cooled transformer using the structural parameters, and determining a three-dimensional temperature field-flow field bidirectional coupling model according to the three-dimensional geometric model and the operating condition parameters; obtaining the internal oil flow distribution of the air-cooled transformer based on the three-dimensional temperature field-flow field bidirectional coupling model, and determining the oil flow dead zone area according to the internal oil flow distribution; respectively obtaining and based on the internal oil flow distributions of the air-cooled transformer when different oil inlet and outlet ports are opened and the internal oil flow distributions at different oil pump speeds and the volume of the oil flow dead zone area through the three-dimensional temperature field-flow field bidirectional coupling model, determining and outputting the optimal oil inlet and outlet ports. The present application effectively improves the heat dissipation efficiency of the internal oil flow of the air-cooled transformer and ensures the safe operation of the air-cooled transformer.

Description

Technical Field

[0001] The present application relates to the technical field of power equipment optimization, and particularly to a method, device, and storage medium for optimizing the oil flow heat dissipation of an air-cooled transformer. Background Art

[0002] With the increasing demand for energy in modern society, transformers, as key power transmission equipment in the power system, it is particularly important to improve the safe, economic, and efficient operation of transformers. Air-cooled transformers play a role in power transmission and economic power distribution in the power system, and use internal oil flow to dissipate heat from the iron core and windings to ensure the safe and stable operation of air-cooled transformers. Therefore, improving the heat dissipation efficiency of the internal oil flow of air-cooled transformers ensures the safe operation of air-cooled transformers. Currently, the design of the oil inlet and outlet of most air-cooled transformers results in oil flow dead zones inside, leading to poor heat dissipation of the internal oil flow of air-cooled transformers. The capacity of air-cooled transformers in the power system is continuously increasing, and their operating temperature is continuously rising, making them more prone to overheating faults due to poor heat dissipation.

[0003] In the implementation process, the inventors found that there are at least the following problems in the traditional technology: the heat dissipation efficiency of the internal oil flow of existing air-cooled transformers is low. Summary of the Invention

[0004] Based on this, it is necessary to provide a method, device, and storage medium for optimizing the oil flow heat dissipation of an air-cooled transformer in view of the above technical problems.

[0005] An air-cooled transformer oil flow heat dissipation optimization method includes:

[0006] Obtain the structural parameters of the air-cooled transformer and the operating condition parameters of the air-cooled transformer;

[0007] Construct a three-dimensional geometric model of the air-cooled transformer using the structural parameters, and determine a three-dimensional temperature field-flow field bidirectional coupling model according to the three-dimensional geometric model and the operating condition parameters;

[0008] Based on the three-dimensional temperature field-flow field bidirectional coupling model, obtain the internal oil flow distribution of the air-cooled transformer, and determine the oil flow dead zone area according to the internal oil flow distribution;

[0009] Through the three-dimensional temperature field-flow field bidirectional coupling model, obtain the internal oil flow distributions of the air-cooled transformer when different oil inlet and outlet are opened and the internal oil flow distributions at different oil pump speeds, and determine the optimal oil inlet and outlet based on the internal oil flow distributions when different oil inlet and outlet are opened, the internal oil flow distributions at different oil pump speeds, and the volume of the oil flow dead zone area; the optimal oil inlet and outlet include the optimal oil inlet and outlet under natural oil circulation cooling conditions and the optimal oil inlet and outlet under forced oil circulation cooling conditions;

[0010] Output the optimal oil inlet and outlet; the optimal oil inlet and outlet are used to indicate that the self-cooled transformer uses the optimal oil inlet and outlet for oil flow heat dissipation.

[0011] In one embodiment, after the step of outputting the optimal oil inlet and outlet, the method further includes:

[0012] Obtain the internal oil flow distribution, oil flow dead zone area, and optimal oil inlet and outlet at each preset moment under different operating conditions, obtain an internal oil flow distribution database according to each internal oil flow distribution, obtain an oil flow dead zone database according to each oil flow dead zone area, and obtain an optimal oil inlet and outlet positioning database according to the positions of each optimal oil inlet and outlet;

[0013] Process the three-dimensional geometric model, internal oil flow distribution database, oil flow dead zone database, and optimal oil inlet and outlet positioning database, and output a three-dimensional internal oil flow digital twin display model; the three-dimensional internal oil flow digital twin display model is used to monitor the self-cooled transformer to guide the production, maintenance, and operation of the self-cooled transformer.

[0014] In one embodiment, the step of processing the three-dimensional geometric model, internal oil flow distribution database, oil flow dead zone database, and optimal oil inlet and outlet positioning database, and outputting a three-dimensional internal oil flow digital twin display model includes:

[0015] Combine the three-dimensional geometric model and the internal oil flow distribution database to obtain an internal oil flow three-dimensional visualization dynamic display model, combine the three-dimensional geometric model and the oil flow dead zone database to obtain an internal oil flow dead zone three-dimensional visualization dynamic display model, and combine the three-dimensional geometric model and the optimal oil inlet and outlet positioning database to obtain an optimal oil inlet and outlet three-dimensional display model;

[0016] Combine the internal oil flow three-dimensional visualization dynamic display model, the internal oil flow dead zone three-dimensional visualization dynamic display model, and the optimal oil inlet and outlet three-dimensional display model to obtain and output a three-dimensional internal oil flow digital twin display model.

[0017] In one embodiment, the step of obtaining the internal oil flow distribution of the self-cooled transformer based on the three-dimensional temperature field-flow field bidirectional coupling model includes:

[0018] Based on the three-dimensional temperature field-flow field bidirectional coupling model, obtain the flow field distribution data of the internal oil flow, and obtain the internal oil flow distribution through the flow field distribution data; the flow field distribution data includes the distribution cloud map of the velocity of the internal oil flow, the vector map of the pressure of the internal oil flow, and the streamline map of the turbulence of the internal oil flow.

[0019] In one embodiment, the step of determining the oil flow dead zone area according to the internal oil flow distribution includes:

[0020] Based on the internal oil flow distribution, the three-dimensional oil flow grid area is re-divided on the basis of the original internal oil flow grid division;

[0021] The oil flow dead zone area is determined by using the three-dimensional components of the regional oil flow velocity in the three-dimensional oil flow grid area and the volume of the amplified three-dimensional oil flow grid area.

[0022] In one embodiment, in the steps of obtaining the respective internal oil flow distributions of the self-cooled transformer when different oil inlet and outlet ports are opened and the respective internal oil flow distributions at different oil pump speeds through the three-dimensional temperature field-flow field bidirectional coupling model, the oil pump speed is adaptively adjusted based on the following model:

[0023]

[0024] where, v rad.n is the oil pump speed; is the volume of the oil flow dead zone area x of the self-cooled transformer when the oil inlet port a i and the oil outlet port b j are opened under forced oil circulation cooling conditions; is the volume of the oil flow dead zone area m of the self-cooled transformer when the oil inlet port a i and the oil outlet port b j are opened under natural oil circulation cooling conditions; V rad.max is the maximum oil pump speed of the self-cooled transformer.

[0025] A self-cooled transformer oil flow heat dissipation optimization device, comprising:

[0026] A data acquisition module, configured to acquire the structural parameters of the self-cooled transformer and the operating condition parameters of the self-cooled transformer;

[0027] A model construction module, configured to construct a three-dimensional geometric model of the self-cooled transformer by using the structural parameters, and determine a three-dimensional temperature field-flow field bidirectional coupling model according to the three-dimensional geometric model and the operating condition parameters;

[0028] An oil flow dead zone area determination module, configured to obtain the internal oil flow distribution of the self-cooled transformer based on the three-dimensional temperature field-flow field bidirectional coupling model, and determine the oil flow dead zone area according to the internal oil flow distribution;

[0029] An optimal oil inlet and outlet port determination module, configured to obtain the respective internal oil flow distributions of the self-cooled transformer when different oil inlet and outlet ports are opened and the respective internal oil flow distributions at different oil pump speeds through the three-dimensional temperature field-flow field bidirectional coupling model, and determine the optimal oil inlet and outlet port based on the respective internal oil flow distributions when different oil inlet and outlet ports are opened, the respective internal oil flow distributions at different oil pump speeds, and the volume of the oil flow dead zone area; the optimal oil inlet and outlet port includes the optimal oil inlet and outlet port under natural oil circulation cooling conditions and the optimal oil inlet and outlet port under forced oil circulation cooling conditions;

[0030] A data output module for outputting the optimal oil inlet and outlet; the optimal oil inlet and outlet are used to indicate that the self-cooling transformer uses the optimal oil inlet and outlet for oil flow heat dissipation.

[0031] In one of the embodiments, it further includes:

[0032] A database construction module for obtaining the internal oil flow distribution, oil flow dead zone area, and optimal oil inlet and outlet at each preset moment under different operating conditions, obtaining an internal oil flow distribution database based on each internal oil flow distribution, obtaining an oil flow dead zone database based on each oil flow dead zone area, and obtaining an optimal oil inlet and outlet positioning database based on the positions of each optimal oil inlet and outlet;

[0033] A model output module for processing a three-dimensional geometric model, an internal oil flow distribution database, an oil flow dead zone database, and an optimal oil inlet and outlet positioning database, and outputting a three-dimensional internal oil flow digital twin display model; the three-dimensional internal oil flow digital twin display model is used to monitor the self-cooling transformer to guide the production, maintenance, and operation of the self-cooling transformer.

[0034] A computer device includes a memory and a processor. The memory stores a computer program, and when the processor executes the computer program, the steps of the above method are implemented.

[0035] A computer-readable storage medium stores a computer program thereon, and when the computer program is executed by a processor, the steps of the above method are implemented.

[0036] At least one of the above technical solutions has the following advantages and beneficial effects:

[0037] In this application, by obtaining the structural parameters of the self-cooling transformer and the operating condition parameters of the self-cooling transformer, a three-dimensional geometric model of the self-cooling transformer is constructed using the structural parameters, and a three-dimensional temperature field-flow field bidirectional coupling model is determined through the three-dimensional geometric model and operating condition parameters of the self-cooling transformer; then, the internal oil flow distribution of the self-cooling transformer is obtained through the three-dimensional temperature field-flow field bidirectional coupling model, and the oil flow dead zone area is determined based on the internal oil flow distribution; through the three-dimensional temperature field-flow field bidirectional coupling model, the internal oil flow distribution of the self-cooling transformer when different oil inlet and outlet are opened and the internal oil flow distribution of the self-cooling transformer at different oil pump speeds are obtained respectively, and in combination with the volume of the oil flow dead zone area, the optimal oil inlet and outlet are determined and output, thereby optimizing the design of the oil inlet and outlet of the self-cooling transformer, enabling the self-cooling transformer to use the optimal oil inlet and outlet for oil flow heat dissipation, reducing the internal oil flow dead zone area during the operation of the self-cooling transformer, effectively improving the heat dissipation efficiency of the internal oil flow of the self-cooling transformer, and ensuring the safe operation of the self-cooling transformer. Description of the Drawings

[0038] To more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0039] Figure 1 It is a schematic flowchart of the method for optimizing the oil flow heat dissipation of a self-cooled transformer in one embodiment;

[0040] Figure 2 It is a schematic flowchart of the method for optimizing the oil flow heat dissipation of a self-cooled transformer in another embodiment;

[0041] Figure 3 It is a schematic flowchart of the steps for determining the oil flow dead zone area in one embodiment;

[0042] Figure 4 It is a schematic diagram for calculating the data of the center point of the oil flow grid in one embodiment;

[0043] Figure 5 It is an amplified boundary positioning map of the oil flow area in one embodiment;

[0044] Figure 6 It is a schematic flowchart of the steps for determining the oil flow dead zone area in a specific example;

[0045] Figure 7 It is a schematic flowchart of the steps for outputting a three-dimensional digital twin display model of the internal oil flow in one embodiment;

[0046] Figure 8 It is a schematic flowchart of the method for optimizing the oil flow heat dissipation of a self-cooled transformer in a specific example;

[0047] Figure 9 It is a structural block diagram of the device for optimizing the oil flow heat dissipation of a self-cooled transformer in one embodiment;

[0048] Figure 10 It is a structural block diagram of the device for optimizing the oil flow heat dissipation of a self-cooled transformer in another embodiment. Detailed implementation manners

[0049] To facilitate the understanding of the present application, the following will describe the present application more comprehensively with reference to the relevant accompanying drawings. Embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0051] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In addition, in the following embodiments, "connection", if there is a transmission of electrical signals or data between the connected objects, should be understood as "electrical connection", "communication connection", etc.

[0052] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising", "including" or "having", etc., specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0053] In one embodiment, as Figure 1 shown, a method for optimizing the oil flow heat dissipation of a self-cooled transformer is provided, which may include:

[0054] Step 202, obtaining the structural parameters of the self-cooled transformer and the operating condition parameters of the self-cooled transformer;

[0055] Step 204, constructing a three-dimensional geometric model of the self-cooled transformer using the structural parameters, and determining a three-dimensional temperature field-flow field bidirectional coupling model according to the three-dimensional geometric model and the operating condition parameters;

[0056] Step 206, based on the three-dimensional temperature field-flow field bidirectional coupling model, obtaining the internal oil flow distribution of the self-cooled transformer, and determining the oil flow dead zone area according to the internal oil flow distribution;

[0057] Step 208, through the three-dimensional temperature field-flow field bidirectional coupling model, respectively obtaining the internal oil flow distributions of the self-cooled transformer when different inlet and outlet oil ports are opened and the internal oil flow distributions at different pump speeds, and determining the optimal inlet and outlet oil ports based on the internal oil flow distributions when different inlet and outlet oil ports are opened, the internal oil flow distributions at different pump speeds, and the volume of the oil flow dead zone area; the optimal inlet and outlet oil ports include the optimal inlet and outlet oil ports under natural oil circulation cooling conditions and the optimal inlet and outlet oil ports under forced oil circulation cooling conditions;

[0058] Step 210, outputting the optimal inlet and outlet oil ports; the optimal inlet and outlet oil ports are used to indicate that the self-cooled transformer uses the optimal inlet and outlet oil ports for oil flow heat dissipation.

[0059] Among them, the structural parameters of the self-cooled transformer can be the actual size parameters of each component of the self-cooled transformer, such as the structural parameters of the shell, iron core, high- and low-voltage windings, etc. of the self-cooled transformer; the operating condition parameters can be the operating condition parameters of the self-cooled transformer under actual operating conditions, such as different ambient temperatures, different ventilation conditions, different load rates, different altitudes, and different oil pump speeds, etc. The oil flow dead zone area is the area where the oil inside the self-cooled transformer does not circulate.

[0060] Specifically, by obtaining the structural parameters of the self-cooled transformer and the operating condition parameters of the self-cooled transformer, a three-dimensional geometric model is constructed according to the actual sizes of each component of the self-cooled transformer using the structural parameters. Modeling is carried out on the shell, iron core, high- and low-voltage windings of the self-cooled transformer, and refined modeling is carried out on the transformer oil and oil channels inside the shell of the self-cooled transformer. Oil inlets are preset at different positions at the bottom of the three-dimensional geometric model of the self-cooled transformer, and oil outlets are preset at different positions at the top of the three-dimensional geometric model.

[0061] According to the three-dimensional geometric model and the operating condition parameters, a three-dimensional temperature field-flow field bidirectional coupling model is determined; and based on the three-dimensional temperature field-flow field bidirectional coupling model, the internal oil flow distribution of the self-cooled transformer is obtained. Then, through the internal oil flow distribution, the oil flow dead zone area of the self-cooled transformer is determined; in the case of determining the oil flow dead zone area, through the three-dimensional temperature field-flow field bidirectional coupling model, the internal oil flow distributions of the self-cooled transformer when different oil inlets and outlets are opened are obtained respectively, and the internal oil flow distributions of the self-cooled transformer at different oil pump speeds are obtained. Thus, based on the internal oil flow distributions when different oil inlets and outlets are opened, the internal oil flow distributions at different oil pump speeds, and the volume of the oil flow dead zone area, the optimal oil inlets and outlets are determined and output; the self-cooled transformer can use the optimal oil inlets and outlets for oil flow heat dissipation, so as to achieve a better heat dissipation effect.

[0062] In this application, by constructing a three-dimensional geometric model of the self-cooled transformer, determining a three-dimensional temperature field-flow field bidirectional coupling model of the self-cooled transformer, and based on the three-dimensional temperature field-flow field bidirectional coupling model, determining the internal oil flow dead zone area of the self-cooled transformer, and then according to the internal oil flow distributions of the self-cooled transformer when different oil inlets and outlets are opened, the internal oil flow distributions at different oil pump speeds, and the volume of the oil flow dead zone area, the optimal oil inlets and outlets are determined and output. Thus, this application optimizes the design of the oil inlets and outlets of the self-cooled transformer, can pre-judge the internal oil flow heat dissipation effect of the self-cooled transformer, and then conducts oil flow heat dissipation through the optimal oil inlets and outlets, reducing the internal oil flow dead zone area during the operation of the self-cooled transformer, effectively improving the heat dissipation efficiency of the internal oil flow of the self-cooled transformer, better ensuring the safe and stable operation of the self-cooled transformer, and improving its working performance.

[0063] In one of the embodiments, as Figure 2As shown, after the step of outputting the optimal oil inlet and outlet, it may further include:

[0064] Step 302, obtain the internal oil flow distribution, oil flow dead zone area, and optimal oil inlet and outlet at each preset moment under different operating conditions, obtain an internal oil flow distribution database according to each internal oil flow distribution, obtain an oil flow dead zone database according to each oil flow dead zone area, and obtain an optimal oil inlet and outlet positioning database according to the positions of each optimal oil inlet and outlet;

[0065] Specifically, first in step 204, a three-dimensional geometric model can be constructed according to the structural parameters of the self-cooled transformer obtained, and the actual size data of each component of the self-cooled transformer are used to model the outer shell, iron core, high- and low-voltage windings of the self-cooled transformer, and the transformer oil and oil ducts inside the outer shell of the self-cooled transformer are finely modeled. Oil inlets are preset at different positions at the bottom of the three-dimensional geometric model of the self-cooled transformer, and oil outlets are preset at different positions at the top of the three-dimensional geometric model of the self-cooled transformer.

[0066] Among them, the setting principle of the oil inlet position at the bottom of the three-dimensional geometric model is as follows: facing the windings of the self-cooled transformer, preset oil inlets are evenly arranged at the bottom in front of and behind the outer shell of the self-cooled transformer at a distance of twice the diameter of the oil inlet, and the bottom oil inlets are sequentially named a j , j = 1, 2,..., n.

[0067] The setting principle of the oil outlet position at the top of the three-dimensional geometric model is as follows: facing the windings of the self-cooled transformer, preset oil outlets are evenly arranged at the top in front of and behind the outer shell of the self-cooled transformer at a distance of twice the diameter of the oil outlet, and the top oil outlets are sequentially named b j , j = 1, 2,..., m.

[0068] According to the possible operating conditions of the self-cooled transformer during actual operation, a three-dimensional temperature field-flow field two-way coupling model of the self-cooled transformer is constructed under different environmental temperatures, different ventilation conditions, different load rates, different altitudes, and different pump speeds and other conditions.

[0069] In one embodiment, step 206 of obtaining the internal oil flow distribution of the self-cooled transformer based on the three-dimensional temperature field-flow field two-way coupling model may include:

[0070] Based on the three-dimensional temperature field-flow field two-way coupling model, obtain the flow field distribution data of the internal oil flow, and obtain the internal oil flow distribution through the flow field distribution data; the flow field distribution data includes the distribution cloud map of the velocity of the internal oil flow, the vector diagram of the pressure of the internal oil flow, and the streamline diagram of the turbulence of the internal oil flow.

[0071] Specifically, on the basis of obtaining the three-dimensional temperature field-flow field bidirectional coupling model of the self-cooling transformer, the flow field distribution data of the oil flow inside the outer shell of the self-cooling transformer at each preset moment under different working conditions are calculated respectively. The calculation moments for the flow field distribution inside the outer shell of the self-cooling transformer should be evenly distributed before the hot spot temperature of the self-cooling transformer stabilizes; the calculation moments for the flow field distribution inside the self-cooling transformer are determined according to the following formula:

[0072] t oil = ωt Tmax

[0073] In the formula, t oil is the calculation moment for the flow field distribution inside the self-cooling transformer; ω is the calculation moment interval coefficient for the flow field distribution inside the self-cooling transformer, 0 < ω < 1. For example, ω can be set to 0.1; t Tmax is the moment when the hot spot temperature of the self-cooling transformer stabilizes.

[0074] After the calculation moments for the internal oil flow field of the self-cooling transformer are selected, the distribution cloud map of the velocity of the internal oil flow, the pressure vector diagram, and the turbulence streamline diagram of the self-cooling transformer are calculated respectively. That is, the flow field distribution data include the distribution cloud map of the velocity of the internal oil flow, the pressure vector diagram of the internal oil flow, and the turbulence streamline diagram of the internal oil flow; among them, the velocity oil flow distribution data should include the velocity components of each point of the internal oil flow in the x, y, and z directions. Thus, the internal oil flow distribution of the self-cooling transformer at each preset moment under different working conditions is obtained.

[0075] In one embodiment, as Figure 3 shown, step 206 of determining the oil flow dead zone area according to the internal oil flow distribution may include:

[0076] Step 402, based on the internal oil flow distribution, re-divide the three-dimensional grid area of the oil flow on the basis of the original internal oil flow grid division;

[0077] Specifically, in the case of obtaining the internal oil flow distribution, re-divide the three-dimensional grid area of the oil flow on the basis of the original internal oil flow grid division of the self-cooling transformer. Before re-dividing the three-dimensional grid area of the oil flow, it is necessary to first calculate the center data of each grid point. As Figure 4 shown, the center point data of the internal oil flow grid of the self-cooling transformer is calculated according to the following formula:

[0078]

[0079] where a mid is the center point data of the hexahedron grid; a i is the vertex data of the hexahedron grid.

[0080] The principles for re - dividing the three - dimensional grid region of oil flow are as follows:

[0081] |a j - max(a i |i = 1, 2, ..., 27)| ≤ a ε

[0082] Among them, a j is the oil flow data at the center point of each grid of the original internal oil flow of the self - cooled transformer, j = 1, 2, …, n; a i is the data of the center points of the remaining adjacent grids centered on a j and surrounding a j ; a ε is the preset grid data difference threshold; a ε is determined by the following formula:

[0083]

[0084] When the difference between a j and a i is less than the preset threshold a ε , then the grids where a j and a i data are located are re - combined and divided into a new grid region b j . After the combination, the three - dimensional grid region b j of the oil flow is as follows:

[0085]

[0086] Among them, a k is the original grid center point data that meets the principles for re - dividing the three - dimensional grid region of the oil flow.

[0087] Therefore, according to the internal oil flow distribution, on the basis of the original internal oil flow grid division, the three - dimensional grid region of the oil flow is re - divided.

[0088] Step 404, determine the oil - flow dead - zone region by using the three - dimensional components of the regional oil - flow velocity in the three - dimensional grid region of the oil flow and the volume of the amplified three - dimensional grid region of the oil flow.

[0089] Specifically, first, the three - dimensional components of the regional oil - flow velocity in the three - dimensional grid region of the oil flow can be used to preliminarily determine the oil - flow dead - zone region; the judgment principles for preliminarily determining the oil - flow dead - zone region are as follows:

[0090]

[0091] Among them, and are the components of the oil - flow velocity data at each point in the x, y, and z directions in the three - dimensional grid region of the oil flow after re - division and combination of the three - dimensional grid region of the oil flow; ||vε || is the preset speed threshold; || v ε || The setting principle should be set separately according to whether the oil flow in the self-cooled transformer is natural oil circulation or forced oil circulation:

[0092] Under the condition of natural oil circulation cooling, || v ε || is set to:

[0093]

[0094] Under the condition of forced oil circulation cooling, || v ε || is set to:

[0095]

[0096] When the velocity data (the three-dimensional components of the regional oil flow velocity) in the three-dimensional grid area of the oil flow after merging satisfies the above formula, it is determined that this oil flow area is the oil flow dead zone area.

[0097] When the three-dimensional components of the regional oil flow velocity do not satisfy the above formula, further judgment is made by expanding the oil flow area boundary based on the regional oil flow pressure, as Figure 5 shown, the principle of expanding the oil flow area boundary is as follows:

[0098]

[0099] where p i is the pressure data of vertex b of the three-dimensional grid area of the oil flow, i = 1, 2, 3, 4; p i ′ is the pressure data of vertex p i of the adjacent three-dimensional grid area b′ of vertex b of the three-dimensional grid area of the oil flow; p ε is the preset pressure threshold; p ε The setting principle should be set separately according to whether the oil flow in the self-cooled transformer is natural oil circulation or forced oil circulation.

[0100] Under the condition of natural oil circulation cooling, p ε is set to:

[0101]

[0102] Under the condition of forced oil circulation cooling, p ε is set to:

[0103] p ε = 0.05min(|p i |, |p′ i |)

[0104] Where \(i = 1, 2, 3, 4\); when the three-dimensional oil flow grid region \(b\) satisfies the above formula, the adjacent regions \(b\) and \(b'\) are further merged into the enlarged three-dimensional oil flow grid region \(c\).

[0105] The data of each point in the enlarged three-dimensional oil flow grid region \(c\) is determined by the following formula:

[0106]

[0107] Furthermore, the volume of the enlarged three-dimensional oil flow grid region is used to further determine whether the oil flow region \(c\) is an oil flow dead zone, and the judgment principle is as follows:

[0108]

[0109] Among them, \(V\) ci is the volume of transformer oil in the enlarged three-dimensional oil flow grid region \(c\), \(i = 1, 2, \cdots, n\); \(V\) oil is the total volume of transformer oil inside the self-cooled transformer shell, \(V\) ε is the preset volume threshold of the oil flow dead zone region.

[0110] When the enlarged three-dimensional oil flow grid region \(c\) satisfies the above formula, it can be determined that this region is an oil flow dead zone region, so that the present application can determine the oil flow dead zone region according to the internal oil flow distribution.

[0111] In a specific example, the steps of determining the oil flow dead zone region can be as Figure 6 shown.

[0112] The present application accurately judges and locates the oil flow dead zone region inside the self-cooled transformer by combining the three-dimensional temperature field-flow field bidirectional coupling model, providing a basis for subsequent optimization of the oil inlet and outlet of the self-cooled transformer.

[0113] In one of the embodiments, in step 208 of obtaining the internal oil flow distributions of the self-cooled transformer when different oil inlet and outlet ports are opened and the internal oil flow distributions at different oil pump speeds through the three-dimensional temperature field-flow field bidirectional coupling model, the oil pump speed is adaptively adjusted based on the following model:

[0114]

[0115] Among them, \(v\) rad.n is the oil pump speed; is the volume of the oil flow dead zone region \(x\) when the self-cooled transformer opens the oil inlet \(a\) i and the oil outlet \(b\) j under the forced oil circulation cooling condition; is the volume of the oil flow dead zone region \(m\) when the self-cooled transformer opens the oil inlet \(a\) i and the oil outlet \(b\) j under the natural oil circulation cooling condition; \(V\) rad.maxThe maximum rotational speed of the oil pump for the self-cooled transformer.

[0116] Specifically, under the condition of natural oil circulation cooling, when different preset inlet and outlet ports are opened, the internal oil flow distribution of the corresponding self-cooled transformer is obtained, and the setting principle of the oil flow dead zone area is as follows:

[0117]

[0118] Among them, is the total volume of the oil flow dead zone area when the inlet port a i and the outlet port b j are opened under the condition of natural oil circulation cooling of the self-cooled transformer; V z.ε is the limit ratio of the oil flow dead zone area of the self-cooled transformer under the condition of natural oil circulation cooling, and V z.ε can be set to 0.05.

[0119] When the volume of the internal oil flow dead zone area meets the above setting principle, the inlet and outlet ports of the self-cooled transformer at this time are the optimal inlet and outlet ports under the condition of natural oil circulation cooling.

[0120] Based on the three-dimensional temperature field-flow field bidirectional coupling model, during the process of obtaining the internal oil flow distribution of the self-cooled transformer when different inlet and outlet ports are opened and at different oil pump rotational speeds, the oil pump rotational speed is adaptively adjusted according to the following model:

[0121]

[0122] Among them, v rad.n is the oil pump rotational speed; is the volume of the oil flow dead zone area x when the inlet port a i and the outlet port b j are opened under the condition of forced oil circulation cooling of the self-cooled transformer; is the volume of the oil flow dead zone area m when the inlet port a i and the outlet port b j are opened under the condition of natural oil circulation cooling of the self-cooled transformer; V rad.max is the maximum rotational speed of the oil pump for the self-cooled transformer.

[0123] After the adjustment of the oil pump rotational speed of the self-cooled transformer is completed, the optimal oil pump rotational speed when the inlet port a i and the outlet port b j are opened is determined, and the rotational speed determination principle is as follows:

[0124]

[0125] Among them, is when the oil pump rotational speed of the self-cooled transformer is v rad.n , the inlet port a i and the outlet port bj The volume of the oil flow dead zone area n at that time; V q.ε is the proportion limit of the maximum oil flow dead zone area of the self-cooled transformer under forced oil circulation cooling conditions. It can be set that V q.ε is 0.02.

[0126] When the maximum oil flow dead zone area inside the self-cooled transformer satisfies the above formula, the inlet a i and the outlet b j can be determined. The optimal pump speed at that time is v rad.n .

[0127] By calculating the oil flow distribution data of opening the inlet and outlet at different positions when the pump speed of the self-cooled transformer is v rad.x , the optimal inlet and outlet of the self-cooled transformer when the pump speed is v rad.x can be determined. The optimal inlet and outlet under the forced oil circulation cooling conditions of the self-cooled transformer are selected according to the following formula:

[0128]

[0129] Among them, is the total volume of the oil flow dead zone area when opening the inlet a rad.x and the outlet b i when the pump speed of the self-cooled transformer is v j , V rad.x.ε is the proportion limit of the oil flow dead zone when the pump speed of the self-cooled transformer is v rad.x . It is set that V rad.x.ε is 0.02.

[0130] When the pump speed of the self-cooled transformer is v rad.x , when the volume of the calculated oil flow dead zone area satisfies the above formula, the optimal inlet and outlet at this time can be determined.

[0131] Through the above steps, the internal oil flow distributions at each preset moment under different operating conditions can be obtained, and an internal oil flow distribution database can be obtained according to each internal oil flow distribution. This internal oil flow distribution database includes: the three-dimensional velocity distribution cloud map, pressure vector map, and turbulence streamline map of the internal oil flow of the self-cooled transformer. Among them, the velocity oil flow distribution data should include the velocity components of each point of the internal oil flow in the x, y, and z directions.

[0132] Through the above steps, the distribution of each oil flow dead zone area of the self-cooled transformer under different operating conditions, different oil inlet and outlet ports, different rotation speeds, and different preset times can also be obtained. Based on the distribution of each oil flow dead zone area, an oil flow dead zone database is obtained. This oil flow dead zone database includes: an internal oil flow dead zone positioning map of the self-cooled transformer, an oil flow dead zone area boundary map, a three-dimensional velocity distribution cloud map inside the oil flow dead zone area, a pressure vector map, and a turbulence streamline map.

[0133] Through the above steps, the optimal oil inlet and outlet ports of the self-cooled transformer under natural oil circulation cooling conditions and the optimal oil inlet and outlet ports under forced oil circulation cooling conditions can also be obtained. Based on the positions of each optimal oil inlet and outlet port, an optimal oil inlet and outlet port positioning database is obtained. This optimal oil inlet and outlet port positioning database includes: an optimal oil inlet and outlet port position positioning map of the self-cooled transformer under natural oil circulation cooling conditions and an optimal oil inlet and outlet port position positioning map of the self-cooled transformer at different rotation speeds of the oil pump under forced oil circulation cooling conditions.

[0134] This application optimizes the internal oil flow of the self-cooled transformer by adjusting the preset oil inlet and outlet port positions of the self-cooled transformer, combines the volume ratio of the oil flow dead zone area to adaptively adjust the rotation speed of the oil pump of the self-cooled transformer under forced oil circulation conditions, and determines the optimal oil inlet and outlet ports of the self-cooled transformer under natural oil circulation cooling conditions and forced oil circulation cooling conditions.

[0135] Step 304, process the three-dimensional geometric model, the internal oil flow distribution database, the oil flow dead zone database, and the optimal oil inlet and outlet port positioning database, and output a three-dimensional internal oil flow digital twin display model; the three-dimensional internal oil flow digital twin display model is used to monitor the self-cooled transformer to guide the production, maintenance, and operation of the self-cooled transformer.

[0136] Specifically, in the case of obtaining the internal oil flow distribution database, the oil flow dead zone database, and the optimal oil inlet and outlet port positioning database, process the three-dimensional geometric model, the internal oil flow distribution database, the oil flow dead zone database, and the optimal oil inlet and outlet port positioning database to obtain and output a three-dimensional internal oil flow digital twin display model. Monitor the self-cooled transformer through this three-dimensional internal oil flow digital twin display model and guide the production, maintenance, and operation of the self-cooled transformer.

[0137] This application combines the internal oil flow distribution data, the oil flow dead zone distribution data, and the oil inlet and outlet port positioning data of the self-cooled transformer with the three-dimensional geometric model of the self-cooled transformer to construct a three-dimensional internal oil flow digital twin display model of the self-cooled transformer, strengthening the visualization of the internal oil flow state and the oil flow dead zone area during the operation of the self-cooled transformer and improving the accuracy of judging the operation state of the self-cooled transformer.

[0138] In one embodiment, such as Figure 7As shown, the steps of processing the three-dimensional geometric model, the internal oil flow distribution database, the oil flow dead zone database, and the optimal oil inlet and outlet positioning database, and outputting the three-dimensional internal oil flow digital twin display model may include:

[0139] Step 502, combining the three-dimensional geometric model and the internal oil flow distribution database to obtain an internal oil flow three-dimensional visual dynamic display model, combining the three-dimensional geometric model and the oil flow dead zone database to obtain an internal oil flow dead zone three-dimensional visual dynamic display model, and combining the three-dimensional geometric model and the optimal oil inlet and outlet positioning database to obtain an optimal oil inlet and outlet three-dimensional display model;

[0140] Step 504, combining the internal oil flow three-dimensional visual dynamic display model, the internal oil flow dead zone three-dimensional visual dynamic display model, and the optimal oil inlet and outlet three-dimensional display model to obtain and output a three-dimensional internal oil flow digital twin display model.

[0141] Specifically, by combining the internal oil flow distribution database of the self-cooled transformer with the three-dimensional geometric model of the self-cooled transformer, an internal oil flow three-dimensional visual dynamic display model of the self-cooled transformer is formed. By combining the oil flow dead zone database of the self-cooled transformer with the three-dimensional geometric model of the self-cooled transformer, an internal oil flow dead zone three-dimensional visual dynamic display model of the self-cooled transformer is formed. By combining the optimal oil inlet and outlet positioning database of the self-cooled transformer with the three-dimensional geometric model of the self-cooled transformer, an optimal oil inlet and outlet three-dimensional display model of the self-cooled transformer is formed. Then, the internal oil flow three-dimensional visual dynamic display model of the self-cooled transformer, the internal oil flow dead zone three-dimensional visual dynamic display model of the self-cooled transformer, and the optimal oil inlet and outlet three-dimensional display model of the self-cooled transformer are combined to construct a three-dimensional internal oil flow digital twin display model of the self-cooled transformer.

[0142] In a specific example, the oil flow heat dissipation optimization method of the self-cooled transformer may be as Figure 8 shown, where the process of determining whether the oil flow is in the optimal state is the process of determining the optimal oil inlet and outlet.

[0143] As described above, the present application adopts digital twin means, and through establishing a digital twin model, it makes the visualization, multi-faceted, two-way information transmission and full-life-cycle display of power equipment in the fields of production and manufacturing, test and measurement, operation and maintenance, real-time monitoring, etc. become more efficient. Based on the calculation of the three-dimensional temperature field-flow field two-way coupling model of the self-cooled transformer under different operating conditions, the present application combines the determined internal oil flow dead zone and optimized data of the oil inlet and outlet of the self-cooled transformer with the three-dimensional geometric model of the self-cooled transformer, and constructs a three-dimensional internal oil flow digital twin display model of the self-cooled transformer. That is, the present application combines digital twin means with the optimized design of the internal oil flow of the self-cooled transformer, optimizes the design of the oil inlet and outlet of the self-cooled transformer, reduces the internal oil flow dead zone of the self-cooled transformer by adopting the optimal oil inlet and outlet, and displays the oil flow dead zone area of the self-cooled transformer through digital twin technology, so as to realize the all-round and real-time display of the internal oil flow and the oil flow dead zone area of the self-cooled transformer under different operating conditions, thereby better guiding the production, maintenance and operation of the self-cooled transformer, improving its operating efficiency, and better improving the heat dissipation performance of the internal oil flow of the self-cooled transformer.

[0144] It should be understood that although Figures 1 - 3 and Figures 6 - 8 the steps in the flowcharts of Figures 1 - 3 and Figures 6 - 8 are shown sequentially according to the indications of the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless there is a clear indication in this article, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover,

[0145] In one embodiment, as Figure 9 shown, a device for optimizing the oil flow heat dissipation of a self-cooled transformer is provided, which may include:

[0146] A data acquisition module 110, configured to acquire the structural parameters of the self-cooled transformer and the operating condition parameters of the self-cooled transformer;

[0147] A model construction module 120, configured to construct a three-dimensional geometric model of the self-cooled transformer by using the structural parameters, and determine a three-dimensional temperature field-flow field two-way coupling model according to the three-dimensional geometric model and the operating condition parameters;

[0148] The oil flow dead zone area determination module 130 is configured to obtain the internal oil flow distribution of the self-cooled transformer based on the three-dimensional temperature field-flow field bidirectional coupling model, and determine the oil flow dead zone area according to the internal oil flow distribution;

[0149] The optimal oil inlet and outlet determination module 140 is configured to obtain the respective internal oil flow distributions of the self-cooled transformer when different oil inlet and outlets are opened and the respective internal oil flow distributions at different oil pump speeds through the three-dimensional temperature field-flow field bidirectional coupling model, and determine the optimal oil inlet and outlet based on the respective internal oil flow distributions when different oil inlet and outlets are opened, the respective internal oil flow distributions at different oil pump speeds, and the volume of the oil flow dead zone area; The optimal oil inlet and outlet includes the optimal oil inlet and outlet under natural oil circulation cooling conditions and the optimal oil inlet and outlet under forced oil circulation cooling conditions;

[0150] The data output module 150 is configured to output the optimal oil inlet and outlet; The optimal oil inlet and outlet is used to indicate that the self-cooled transformer uses the optimal oil inlet and outlet for oil flow heat dissipation.

[0151] In one embodiment, as Figure 10 shown, the self-cooled transformer oil flow heat dissipation optimization device may further include:

[0152] The database construction module 160 is configured to obtain the internal oil flow distribution, the oil flow dead zone area, and the optimal oil inlet and outlet at each preset moment under different operating conditions, and obtain the internal oil flow distribution database according to the respective internal oil flow distributions, the oil flow dead zone database according to the respective oil flow dead zone areas, and the optimal oil inlet and outlet positioning database according to the positions of the respective optimal oil inlets and outlets;

[0153] The model output module 170 is configured to process the three-dimensional geometric model, the internal oil flow distribution database, the oil flow dead zone database, and the optimal oil inlet and outlet positioning database, and output a three-dimensional internal oil flow digital twin display model; The three-dimensional internal oil flow digital twin display model is used to monitor the self-cooled transformer to guide the production, maintenance, and operation of the self-cooled transformer.

[0154] In one embodiment, the model output module 170 is further configured to combine the three-dimensional geometric model and the internal oil flow distribution database to obtain an internal oil flow three-dimensional visual dynamic display model, combine the three-dimensional geometric model and the oil flow dead zone database to obtain an internal oil flow dead zone three-dimensional visual dynamic display model, and combine the three-dimensional geometric model and the optimal oil inlet and outlet positioning database to obtain an optimal oil inlet and outlet three-dimensional display model; Combine the internal oil flow three-dimensional visual dynamic display model, the internal oil flow dead zone three-dimensional visual dynamic display model, and the optimal oil inlet and outlet three-dimensional display model to obtain and output a three-dimensional internal oil flow digital twin display model.

[0155] In one embodiment, the oil flow dead zone area determination module 130 is further configured to obtain the flow field distribution data of the internal oil flow based on a three-dimensional temperature field-flow field bidirectional coupling model, and obtain the internal oil flow distribution through the flow field distribution data; the flow field distribution data includes a distribution contour map of the velocity of the internal oil flow, a vector map of the pressure of the internal oil flow, and a streamline map of the turbulence of the internal oil flow.

[0156] In one embodiment, the oil flow dead zone area determination module 130 is further configured to re-divide the three-dimensional oil flow grid area based on the internal oil flow distribution on the basis of the original internal oil flow grid division; determine the oil flow dead zone area by using the three-dimensional components of the regional oil flow velocity in the three-dimensional oil flow grid area and the volume of the amplified three-dimensional oil flow grid area.

[0157] In one embodiment, the optimal oil inlet and outlet determination module 140 is further configured to adaptively adjust the pump speed of the oil pump based on the following model:

[0158]

[0159] where v rad.n is the pump speed of the oil pump; is the volume of the oil flow dead zone area x when the oil inlet a i and the oil outlet b j are opened under the forced oil circulation cooling condition of the self-cooling transformer; is the volume of the oil flow dead zone area m when the oil inlet a i and the oil outlet b j are opened under the natural oil circulation cooling condition of the self-cooling transformer; V rad.max is the maximum pump speed of the oil pump of the self-cooling transformer.

[0160] For the specific limitations on the self-cooling transformer oil flow heat dissipation optimization device, reference can be made to the limitations on the self-cooling transformer oil flow heat dissipation optimization method in the above text, which will not be elaborated here. Each module in the above self-cooling transformer oil flow heat dissipation optimization device can be implemented in whole or in part by software, hardware, and their combination. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so as to facilitate the processor to call and execute the operations corresponding to the above modules. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division. In actual implementation, there may be other division methods.

[0161] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0162] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0163] Those of ordinary skill in the art can understand that all or part of the processes in the above method embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above method embodiments. Among them, any reference to a memory, database, or other medium used in the embodiments provided in this application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in this application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in this application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logic devices, data processing logics based on quantum computing, etc., without limitation.

[0164] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", "ideal embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0165] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0166] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. An optimization method for the heat dissipation of the oil flow of a self-cooling transformer, characterized in that, Including: Obtaining the structural parameters of the self-cooled transformer and the operating condition parameters of the self-cooled transformer; Constructing a three-dimensional geometric model of the self-cooled transformer using the structural parameters, and determining a three-dimensional temperature field-flow field bidirectional coupling model based on the three-dimensional geometric model and the operating condition parameters; Based on the three-dimensional temperature field-flow field bidirectional coupling model, obtaining the internal oil flow distribution of the self-cooled transformer. Based on the internal oil flow distribution, re-dividing the oil flow three-dimensional grid area on the basis of the original internal oil flow grid division, and using the three-dimensional components of the regional oil flow velocity in the oil flow three-dimensional grid area and the volume of the amplified oil flow three-dimensional grid area to determine the oil flow dead zone area; When the velocity data in the merged oil flow three-dimensional grid area meets the preset velocity threshold, the oil flow three-dimensional grid area is the oil flow dead zone area; If the preset speed threshold is not met, further judgment is made based on the regional oil flow pressure to amplify the boundary of the oil flow region. When the volume V of the transformer oil in the amplified three-dimensional oil flow grid region ci is less than the total volume V of the transformer oil inside the self-cooled transformer housing oil , and the volume V of the preset oil flow dead zone region ε satisfies , the amplified three-dimensional oil flow grid region is the oil flow dead zone region; Through the three-dimensional temperature field-flow field bidirectional coupling model, respectively obtaining the internal oil flow distributions of the self-cooled transformer when different oil inlet and outlet ports are opened and the internal oil flow distributions at different oil pump speeds. Obtaining the oil flow dead zone areas under different oil inlet and outlet ports and different oil pump speeds according to the internal oil flow distributions under different oil inlet and outlet ports and different oil pump speeds. When the ratio of the total volume of the oil flow dead zone area to the total volume of the transformer oil inside the shell of the self-cooled transformer is not greater than the proportion limit value of the oil flow dead zone area of the self-cooled transformer, determining the oil inlet and outlet port at this time as the optimal oil inlet and outlet port; The optimal oil inlet and outlet ports include the optimal oil inlet and outlet ports under natural oil circulation cooling conditions and the optimal oil inlet and outlet ports under forced oil circulation cooling conditions; Outputting the optimal oil inlet and outlet port; The optimal oil inlet and outlet port is used to indicate that the self-cooled transformer uses the optimal oil inlet and outlet port for oil flow heat dissipation.

2. The self-cooling transformer oil flow heat dissipation optimization method according to claim 1, wherein After the step of outputting the optimal oil inlet and outlet port, it further includes: Obtaining the internal oil flow distribution, the oil flow dead zone area, and the optimal oil inlet and outlet port at each preset moment under different operating conditions, obtaining an internal oil flow distribution database according to each internal oil flow distribution, obtaining an oil flow dead zone database according to each oil flow dead zone area, and obtaining an optimal oil inlet and outlet port positioning database according to the positions of each optimal oil inlet and outlet port; Processing the three-dimensional geometric model, the internal oil flow distribution database, the oil flow dead zone database, and the optimal oil inlet and outlet port positioning database, and outputting a three-dimensional internal oil flow digital twin display model; The three-dimensional internal oil flow digital twin display model is used to monitor the self-cooled transformer to guide the production, maintenance, and operation of the self-cooled transformer.

3. The self-cooling transformer oil flow heat dissipation optimization method according to claim 2, characterized in that The step of processing the three-dimensional geometric model, the internal oil flow distribution database, the oil flow dead zone database, and the optimal oil inlet and outlet port positioning database, and outputting a three-dimensional internal oil flow digital twin display model includes: Combine the three-dimensional geometric model and the internal oil flow distribution database to obtain a three-dimensional visual dynamic display model of the internal oil flow. Combine the three-dimensional geometric model and the oil flow dead zone database to obtain a three-dimensional visual dynamic display model of the internal oil flow dead zone, and combine the three-dimensional geometric model and the optimal oil inlet and outlet positioning database to obtain an optimal three-dimensional display model of the oil inlet and outlet; Combine the three-dimensional visual dynamic display model of the internal oil flow, the three-dimensional visual dynamic display model of the internal oil flow dead zone, and the optimal three-dimensional display model of the oil inlet and outlet to obtain and output the three-dimensional digital twin display model of the internal oil flow.

4. The self-cooling transformer oil flow heat dissipation optimization method according to claim 1, wherein The step of obtaining the internal oil flow distribution of the self-cooled transformer based on the three-dimensional temperature field-flow field bidirectional coupling model includes: Based on the three-dimensional temperature field-flow field bidirectional coupling model, obtain the flow field distribution data of the internal oil flow, and obtain the internal oil flow distribution through the flow field distribution data; the flow field distribution data includes the distribution cloud map of the velocity of the internal oil flow, the vector map of the pressure of the internal oil flow, and the streamline map of the turbulence of the internal oil flow.

5. The self-cooling transformer oil flow heat dissipation optimization method according to any one of claims 1 to 4, characterized in that, In the step of obtaining the internal oil flow distributions of the self-cooled transformer when different oil inlets and outlets are opened and the internal oil flow distributions at different oil pump speeds respectively through the three-dimensional temperature field-flow field bidirectional coupling model, adaptively adjust the oil pump speed based on the following model: Among them, v rad.n is the rotational speed of the oil pump; is the volume of the oil flow dead zone area x when the oil inlet a i and the oil outlet b j of the self-cooled transformer are opened under forced oil circulation cooling conditions; is the volume of the oil flow dead zone area m when the oil inlet a i and the oil outlet b j of the self-cooled transformer are opened under natural oil circulation cooling conditions; V rad.max is the maximum rotational speed of the oil pump of the self-cooled transformer.

6. An optimized device for heat dissipation of the oil flow in a self-cooling transformer, characterized in that, Including: A data acquisition module for acquiring the structural parameters of the self-cooled transformer and the operating condition parameters of the self-cooled transformer; A model construction module for constructing a three-dimensional geometric model of the self-cooled transformer using the structural parameters, and determining a three-dimensional temperature field-flow field bidirectional coupling model according to the three-dimensional geometric model and the operating condition parameters; An oil flow dead zone area determination module for obtaining the internal oil flow distribution of the self-cooled transformer based on the three-dimensional temperature field-flow field bidirectional coupling model, re-dividing the three-dimensional oil flow grid area based on the internal oil flow distribution on the basis of the original internal oil flow grid division, and determining the oil flow dead zone area using the three-dimensional components of the regional oil flow velocity in the three-dimensional oil flow grid area and the volume of the amplified three-dimensional oil flow grid area; When the velocity data in the merged three-dimensional oil flow grid region meets the preset velocity threshold, the three-dimensional oil flow grid region is the oil flow dead zone region; if the preset velocity threshold is not met, further judgment is made based on the regional oil flow pressure to amplify the oil flow region boundary. When the volume V of the transformer oil in the amplified three-dimensional oil flow grid region ci is less than the total volume V of the transformer oil inside the self-cooled transformer housing oil , and the preset volume V of the oil flow dead zone region ε satisfies , the amplified three-dimensional oil flow grid region is the oil flow dead zone region; An optimal oil inlet and outlet determination module for obtaining the internal oil flow distributions of the self-cooled transformer when different oil inlets and outlets are opened and the internal oil flow distributions at different oil pump speeds respectively through the three-dimensional temperature field-flow field bidirectional coupling model, obtaining the oil flow dead zone areas under different oil inlets and outlets and different oil pump speed conditions according to the internal oil flow distributions under different oil inlets and outlets and different oil pump speed conditions, and determining the oil inlet and outlet at this time as the optimal oil inlet and outlet when the ratio of the total volume of the oil flow dead zone area to the total volume of the transformer oil inside the self-cooled transformer shell is not greater than the ratio limit of the oil flow dead zone area of the self-cooled transformer; the optimal oil inlet and outlet includes the optimal oil inlet and outlet under natural oil circulation cooling conditions and the optimal oil inlet and outlet under forced oil circulation cooling conditions; A data output module for outputting the optimal oil inlet and outlet; the optimal oil inlet and outlet is used to indicate that the self-cooling transformer uses the optimal oil inlet and outlet for oil flow heat dissipation.

7. The self-cooling transformer oil flow heat dissipation optimization device according to claim 6, characterized in that It further includes: A database construction module for obtaining the internal oil flow distribution, the oil flow dead zone area, and the optimal oil inlet and outlet at each preset moment under different operating conditions, obtaining an internal oil flow distribution database according to each internal oil flow distribution, obtaining an oil flow dead zone database according to each oil flow dead zone area, and obtaining an optimal oil inlet and outlet positioning database according to the positions of each optimal oil inlet and outlet; A model output module for processing the three-dimensional geometric model, the internal oil flow distribution database, the oil flow dead zone database, and the optimal oil inlet and outlet positioning database, and outputting a three-dimensional internal oil flow digital twin display model; the three-dimensional internal oil flow digital twin display model is used to monitor the self-cooling transformer to guide the production, maintenance, and operation of the self-cooling transformer.

8. The self-cooling transformer oil flow heat dissipation optimization device according to claim 7, characterized in that, The model output module is further used to combine the three-dimensional geometric model and the internal oil flow distribution database to obtain an internal oil flow three-dimensional visualization dynamic display model, combine the three-dimensional geometric model and the oil flow dead zone database to obtain an internal oil flow dead zone three-dimensional visualization dynamic display model, and combine the three-dimensional geometric model and the optimal oil inlet and outlet positioning database to obtain an optimal oil inlet and outlet three-dimensional display model; combining the internal oil flow three-dimensional visualization dynamic display model, the internal oil flow dead zone three-dimensional visualization dynamic display model, and the optimal oil inlet and outlet three-dimensional display model to obtain and output the three-dimensional internal oil flow digital twin display model.

9. A computer device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, the steps of the method according to any one of claims 1 to 5 are implemented.

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