Simulation method and device for internal flow field of GIS equipment and computer equipment

Abstract

The application provides a simulation method and device for a flow field in a GIS device and a computer device. The method comprises: performing an experiment on a physical model in air to obtain a flow field experiment result; performing simulation by using a first simulation model to obtain a first flow field simulation result; the first simulation model is a simulation model under an air atmosphere; correcting the first simulation model according to the flow field experiment result and the first flow field simulation result until the first simulation model meets a requirement; converting the first simulation model meeting the requirement into a second simulation model according to a first similarity parameter; the second simulation model is a simulation model under an SF6 atmosphere, the second simulation model has the same size as the GIS device and is larger than the size of the physical model; and simulating the GIS device by using the second simulation model. The method is equivalent to correcting and checking the second simulation model with a large size by using a small-size model, so that an accurate simulation model with high accuracy is obtained at a low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical equipment simulation, and particularly relates to a GIS device internal flow field simulation method and device, computer equipment and a storage medium. BACKGROUND

[0002] GIS (Gas Insulated Switchgear, gas insulated switchgear) devices are widely used in power systems around the world. In order to improve the GIS device, the treatment of its internal heat generation and heat dissipation is an important issue. The thermal degradation of GIS devices due to high temperature often causes various adverse consequences in combination with other factors. Therefore, once the internal components, parts, materials, etc. of the switch cabinet exceed the allowable temperature range, not only the performance cannot be guaranteed, but also misoperation may occur, the service life is shortened (10℃ halving rule), and the reliability of the GIS device is significantly reduced. For example, the busbar through-flow temperature rise will make the distribution uneven, the higher the temperature rise, the thinner the distribution of the area, and the more serious the insulation level drops. The overheating of the high-voltage current-carrying conductor in the switch cabinet will cause insulation damage, resulting in discharge and even main insulation breakdown, causing equipment damage and user power failure. Therefore, in the development process of the GIS device, the temperature rise situation is fully considered, the temperature rise law is studied, and the GIS design scheme is optimized, which has important engineering application value.

[0003] At present, with the development of field analysis technology, the heat generation and heat dissipation problems in the GIS device can be determined through flow field analysis, so as to improve the design scheme of the GIS device. Therefore, there is an urgent need for a method capable of accurately simulating the flow field of the GIS device. SUMMARY

[0004] The purpose of the present application is to at least solve one of the above technical defects, in particular, the technical defect that there is a lack of a method capable of accurately simulating the flow field in the GIS device in the prior art.

[0005] In a first aspect, an embodiment of the present application provides a GIS device internal flow field simulation method, comprising:

[0006] Performing experiments on the physical model in the air to obtain flow field experimental results;

[0007] Simulating by using a first simulation model to obtain first flow field simulation results; the first simulation model is a simulation model under an air atmosphere;

[0008] According to the flow field experimental results and the first flow field simulation results, the first simulation model is corrected until the first simulation model meets the requirements;

[0009] According to the first similarity criterion, the first simulation model meeting the requirement is converted into a second simulation model; the second simulation model is a simulation model in an SF6 atmosphere, the second simulation model has the same size as the GIS device and is larger than the size of the physical model;

[0010] The GIS device is simulated by using the second simulation model.

[0011] In one of the embodiments, the requirement includes that the fluid in the physical model and the fluid in the first simulation model have the same flow direction and convection mode.

[0012] In one of the embodiments, the requirement further includes that the second similarity criterion of the physical model and the first simulation model is equal.

[0013] In one of the embodiments, the second similarity criterion is the Froude number.

[0014] In one of the embodiments, the first similarity criterion is the Galileo number.

[0015] In one of the embodiments, the physical model in the air is experimented to obtain the flow field experimental result, including:

[0016] The current is input to the to-be-tested conductor to heat the to-be-tested conductor;

[0017] In the case that the stable temperature rise of the to-be-tested conductor reaches a preset value, the flow field of the to-be-tested conductor is photographed by using the schlieren observation system to obtain the flow field experimental result.

[0018] In one of the embodiments, the schlieren observation system includes a light source, two oppositely arranged concave mirrors, and a schlieren camera; the light path of the light emitted by the light source is in a Z shape and sequentially passes through the two concave mirrors to reach the schlieren camera; the part of the light path between the two concave mirrors passes through the flow field of the to-be-tested conductor.

[0019] In a second aspect, the embodiments of the present application further provide a simulation device for a flow field in a GIS device, including:

[0020] The experimental module is configured to experiment on the physical model in the air to obtain a flow field experimental result.

[0021] The first simulation module is configured to simulate by using the first simulation model to obtain a first flow field simulation result; the first simulation model is a simulation model in an air atmosphere.

[0022] The correction module is configured to correct the first simulation model according to the flow field experimental result and the first flow field simulation result until the first simulation model meets the requirement.

[0023] The conversion module is configured to convert the first simulation model meeting the requirement into a second simulation model according to the first similarity criterion; the second simulation model is a simulation model in an SF6 atmosphere, the second simulation model has the same size as the GIS device and is larger than the size of the physical model;

[0024] The second simulation module is configured to simulate the GIS device by using the second simulation model.

[0025] In a third aspect, an embodiment of the present application further provides a computer device, which comprises one or more processors and a memory, and the memory stores computer readable instructions, and the computer readable instructions are executed by the one or more processors to perform the steps of the simulation method in any of the above embodiments.

[0026] In a fourth aspect, an embodiment of the present application further provides a storage medium, which stores computer readable instructions, and the computer readable instructions are executed by one or more processors to make the one or more processors perform the steps of the simulation method in any of the above embodiments.

[0027] From the above technical solutions, it can be seen that the embodiments of the present application have the following advantages:

[0028] Based on any of the above embodiments, the small-size physical model in the air is experimented, the physical model is first equivalent to the first simulation model in the air, then the first equivalent model is equivalent to the second simulation model in the SF6 atmosphere and has the same size as the actual GIS device, and finally the second simulation model is simulated to guide the structural optimization of the GIS device. The method is equivalent to correcting and verifying the large-size second simulation model by the small-size model, and an accurate simulation model with low cost and small area can be obtained, and the method has the advantages of low implementation cost, small area, light equipment, safe operation and the like. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Figure 1 The flow field schematic diagram of the simulation method of the GIS device internal flow field provided by the embodiments of the present application;

[0031] Figure 2 The scene schematic diagram of the experiment by using the physical model provided by the embodiments of the present application;

[0032] Figure 3A module structure diagram of a simulation device for an internal flow field of a GIS device provided in an embodiment of the present application is shown in FIG. 1.

[0033] Figure 4 An internal structure diagram of a computer device provided in an embodiment of the present application is shown in FIG. 6. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0035] In a first aspect, an embodiment of the present application provides a simulation method for an internal flow field of a GIS device, referring to FIG. 2, comprising steps S102 to S110. Figure 1

[0036] S102, performing an experiment on a physical model in air to obtain a flow field experimental result.

[0037] It can be understood that the GIS device has a large volume, and it is difficult and costly to design a model according to the actual size and actual working environment of the GIS device. Therefore, the experimental model in the embodiment is a physical model with a size smaller than the actual size of the GIS device, and the appropriate observation size can be flexibly selected. In addition, although the GIS device is filled with SF6 gas under a certain pressure, which is different from the air atmosphere of the physical model, it is more flexible and convenient to perform the experiment in air. Through subsequent processing, the experimental result under the air atmosphere can be applied to the SF6 atmosphere. The flow field experimental result is obtained by observing the change of the flow field near the physical model when the physical model is warmed up through a corresponding observation system. For example, flow field structure, convection mode, velocity field distribution, etc. The specific observation data and the design of the observation system can be selected according to the actual situation.

[0038] S104, performing simulation by using a first simulation model to obtain a first flow field simulation result.

[0039] The first simulation model is a simulation model under an air atmosphere. It can be understood that the first simulation model is a simulation model based on the GIS device and running on a computer. The physical model building process is complex and needs to be customized for different GIS devices, and the simulation model is more flexible to use. However, the simulation result of the first simulation model needs to reflect the flow field information under the real situation, and therefore, the first simulation model needs to be corrected to ensure the simulation accuracy.

[0040] ​S106, according to the flow field experimental result and the first flow field simulation result, the first simulation model is corrected until the first simulation model meets the requirements.

[0041] Specifically, the first simulation model and the physical model are both in air atmosphere, and the physical model reflects the flow field change of the GIS device in the actual situation, and the flow field experimental result obtained by the physical model can be used as a reference to reduce the difference between the first flow field simulation result and the flow field experimental result. The first simulation model is corrected to gradually improve the equivalence of the first simulation model and the physical model. When the first simulation model meets the requirements, it can be considered that the first simulation model can better reflect the flow field change of the GIS device in the actual situation. In addition, since the first simulation model is a mathematical model, its size can be flexibly selected.

[0042] S108, according to the first similarity criterion, the first simulation model meeting the requirements is converted into a second simulation model.

[0043] The second simulation model is a simulation model in SF6 atmosphere, and the size of the second simulation model is the same as that of the GIS device and larger than that of the physical model. It can be understood that in practice, SF6 gas is added to the interior of the GIS device, which is different from air atmosphere. Therefore, the first simulation model is not the same as the fluid in the actual device, and needs to be equivalent. In the field of fluid mechanics, if two different fluids need to be equivalent, the corresponding similarity criterion should be kept equal. The first similarity criterion is the similarity criterion that needs to be followed when the first simulation model in air atmosphere is equivalent to the second simulation model in SF6 atmosphere. In addition, the size of the second simulation model should be selected to be the same as the actual GIS device for which the simulation is aimed at, so as to simulate the flow field change in the interior of the GIS device. Since the size of the GIS device is much larger than that of the physical model, the size of the second simulation model should also be larger than that of the physical model.

[0044] S110, using the second simulation model to simulate the GIS device.

[0045] After obtaining the second simulation model, the simulation result based on the second simulation model can obtain the flow field change in the interior of the GIS device with higher accuracy, so as to strengthen the designer's understanding of the flow field in the interior of the GIS device, and more conducive to the optimization design of the structure, to obtain the structure conducive to heat dissipation, thereby reducing the working temperature in the GIS.

[0046] Based on the simulation method of the internal flow field of the GIS device in the embodiment, through the experiment on the small-size physical model in air, the physical model is first equivalent to a first simulation model also in air, and then the first equivalent model is equivalent to a second simulation model in SF6 atmosphere and with the same size as the actual GIS device, and finally the simulation is performed by the second simulation model to guide the structural optimization of the GIS device. The method is equivalent to correcting and verifying the large-size second simulation model by the small-size model, and the simulation model with high accuracy can be obtained with low cost, and the method has the advantages of low implementation cost, small occupied area, portable equipment, safe operation and the like.

[0047] In one of the embodiments, the requirements include that the fluid in the physical model and the first simulation model has the same flow direction and convection mode. It can be understood that the structure beneficial to heat dissipation can be designed according to the flow direction and convection mode of the fluid. The flow direction and convection mode of the fluid in the physical model when the temperature rises are the same as those of the actual GIS device. In order to design the structure of the actual GIS device according to the simulation result, by correcting the first simulation model, the fluid in the first simulation model has the same flow direction and convection mode as the fluid in the physical model, which can ensure that the fluid in the first simulation model also has the same flow direction and convection mode as the fluid in the actual GIS device.

[0048] Further, in one of the embodiments, the requirements also include that the second similarity criterion of the physical model and the first simulation model is equal. That is, in order to ensure the equivalence of the physical model and the first simulation model, although the physical model and the first simulation model are both in air atmosphere, the size of the first simulation model is different from that of the physical model, and the fluid is still different. The second similarity criterion is the similarity criterion that needs to be followed when the physical model and the first simulation model are equivalent.

[0049] In one of the embodiments, the second similarity criterion is the Froude number. It can be understood that there are many similarity criteria that can be considered in fluid mechanics, but since the physical model and the first simulation model are both the same kind of gas, the effect of viscous force can be ignored, and the effect of buoyancy force can be considered, and the Froude number can be selected as the second similarity criterion to simplify the analysis process. Specifically, the physical model and the first simulation model need to satisfy:

[0050]

[0051] Wherein, u A is the movement speed of the fluid in the physical model, l A is the characteristic length of the physical model, u B is the movement speed of the fluid in the first simulation model, and l Bis the characteristic length of the first simulation model. The fluid similarity premise is geometric similarity. A certain representative dimension is usually selected as the characteristic length of the model. For example, two objects are geometrically similar if they have the same angles (including azimuth or attitude angles) and the ratio of all linear lengths is equal. The above formula can also be simplified as:

[0052]

[0053] Therefore, a suitable size ratio can be flexibly selected for small model testing.

[0054] In one embodiment, the first similarity criterion is the Galileo number. It can be understood that, since the first simulation model and the second simulation model are not the same gas, both viscous force and buoyancy force need to be considered, and the Galileo number can be selected as the first similarity criterion to ensure the equivalence of the first simulation model and the second simulation model. Specifically, the first simulation model and the second simulation model need to satisfy:

[0055]

[0056] wherein, l B is the characteristic length of the first simulation model, g is the acceleration of gravity, v B is the kinematic viscosity coefficient of the first simulation model, l C is the characteristic length of the first simulation model, v C is the kinematic viscosity coefficient of the first simulation model. The kinematic viscosity coefficient is equal to the ratio between the dynamic viscosity coefficient and the fluid density.

[0057] In one embodiment, the real model in the air is tested to obtain the flow field test results, including:

[0058] 1) A current is passed into the to-be-tested conductor to heat the to-be-tested conductor.

[0059] 2) When the stable temperature rise of the to-be-tested conductor reaches a preset value, a schlieren observation system is used to shoot the flow field of the to-be-tested conductor to obtain the flow field test results.

[0060] Specifically, the to-be-tested conductor in the real model simulates the heat source inside the GIS device, and a current generator is used to pass a current into the to-be-tested conductor to heat the to-be-tested conductor. When the stable temperature rise of the to-be-tested conductor reaches a preset value (such as 60K), the actual working condition of the GIS device is simulated, and then a schlieren observation system is used to observe the fluid around the to-be-tested conductor to obtain the flow field test results.

[0061] In one embodiment, as Figure 2As shown, the schlieren observation system comprises a light source, two oppositely arranged concave mirrors and a schlieren camera. The light path of the light emitted by the light source is in a Z shape, and sequentially passes through the two concave mirrors to reach the schlieren camera, and the part of the light path between the two concave mirrors passes through the flow field of the conductor to be measured. The experimenter controls the current input to the conductor to be measured through the console, the light emitted by the light source is shot to the concave mirror 2, the light is shot to the concave mirror 1 opposite to the concave mirror 2 under the action of the concave mirror 2 and passes through the flow field of the conductor to be measured, the refractive index gradient of the light in the flow field of the conductor to be measured is proportional to the flow field density, and the temperature change of the conductor to be measured changes the flow field density, the concave mirror 1 reflects the light affected by the flow field of the conductor to be measured to the schlieren camera, and the schlieren camera records the flow field change.

[0062] In a second aspect, the embodiments of the present application further provide a simulation device for a flow field in a GIS device. Please refer to Figure 3 The simulation device comprises an experiment module, a first simulation module, a correction module, a conversion module and a second simulation module. The experiment module is configured to perform an experiment on a physical model in air to obtain a flow field experiment result. The first simulation module is configured to perform simulation by using a first simulation model to obtain a first flow field simulation result. The first simulation model is a simulation model under an air atmosphere. The correction module is configured to correct the first simulation model according to the flow field experiment result and the first flow field simulation result until the first simulation model meets a requirement. The conversion module is configured to convert the first simulation model meeting the requirement into a second simulation model according to a first similarity parameter. The second simulation model is a simulation model under an SF6 atmosphere, the second simulation model has the same size as the GIS device and is larger than the size of the physical model. The second simulation module is configured to perform simulation on the GIS device by using the second simulation model.

[0063] The specific limitations of the simulation device for the flow field in the GIS device can be referred to the limitations of the simulation method for the flow field in the GIS device in the foregoing, and will not be described herein. The modules in the simulation device for the flow field in the GIS device can be realized by software, hardware and combinations thereof in whole or in part. The modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor. It should be noted that the division of the modules in the embodiments of the present application is illustrative, and is only a logical division. In actual implementation, another division manner can be used.

[0064] In a third aspect, the embodiments of the present application further provide a computer device, comprising one or more processors, and a memory having computer readable instructions stored therein, which, when executed by the one or more processors, perform the following: performing an experiment on a physical model in air to obtain a flow field experimental result; performing simulation by using a first simulation model to obtain a first flow field simulation result; the first simulation model is a simulation model in air; correcting the first simulation model according to the flow field experimental result and the first flow field simulation result until the first simulation model meets a requirement; converting the first simulation model meeting the requirement into a second simulation model according to a first similarity parameter; the second simulation model is a simulation model in SF6 atmosphere, the second simulation model has the same size as the GIS device and is larger than the size of the physical model; and simulating the GIS device by using the second simulation model.

[0065] In one of the embodiments, the computer readable instructions, when executed by the one or more processors, perform the following: passing current to the conductor to be tested to heat the conductor to be tested; and photographing the flow field of the conductor to be tested by using a schlieren observation system to obtain a flow field experimental result, when the stable temperature rise of the conductor to be tested reaches a preset value.

[0066] As shown in Figure 4 , Figure 4 is a schematic diagram of an internal structure of a computer device provided by the embodiments of the present application. Referring to Figure 4 , the computer device 300 comprises a processing component 302, which further comprises one or more processors, and a memory resource represented by a memory 301, for storing instructions executable by the processing component 302, such as an application program. The application program stored in the memory 301 can comprise one or more than one module each corresponding to a set of instructions. In addition, the processing component 302 is configured to execute the instructions to perform the simulation method of any of the embodiments described above.

[0067] The computer device 300 can further comprise a power supply component 303 configured to perform power management of the computer device 300, a wired or wireless network interface 304 configured to connect the computer device 300 to a network, and an input / output (I / O) interface 305. The computer device 300 can operate based on an operating system stored in the memory 301, such as Windows Server TM, Mac OS X TM, Unix TM, Linux TM, Free BSD TM or the like.

[0068] Those skilled in the art can understand, Figure 4It should be noted that the structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. The specific computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0069] In a fourth aspect, the embodiments of the present application also provide a storage medium, which stores computer readable instructions. When the computer readable instructions are executed by one or more processors, the one or more processors perform the following operations: performing an experiment on a physical model in air to obtain a flow field experimental result; performing simulation by using a first simulation model to obtain a first flow field simulation result; the first simulation model is a simulation model in an air atmosphere; correcting the first simulation model according to the flow field experimental result and the first flow field simulation result until the first simulation model meets a requirement; converting the first simulation model that meets the requirement into a second simulation model according to a first similarity parameter; the second simulation model is a simulation model in an SF6 atmosphere, the size of the second simulation model is the same as that of a GIS device and is larger than that of the physical model; and simulating the GIS device by using the second simulation model.

[0070] In one of the embodiments, when the computer readable instructions are executed by the one or more processors, the one or more processors perform the following operations: passing a current into a conductor to be tested to heat the conductor to be tested; and when the stable temperature rise of the conductor to be tested reaches a preset value, using a schlieren observation system to shoot a flow field of the conductor to be tested to obtain a flow field experimental result.

[0071] Finally, it should be noted that in this document, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0072] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The various embodiments can be combined as needed, and the same and similar parts refer to each other.

[0073] The foregoing description of the disclosed embodiments enables a person skilled in the art to make or use the application. Modifications of these embodiments will occur to persons of skill in the art, and that the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of simulating a flow field inside a GIS device, characterized by, The method comprises the following steps: performing an experiment on a physical model in air to obtain a flow field experimental result; performing simulation by using a first simulation model to obtain a first flow field simulation result; the first simulation model is a simulation model under an air atmosphere; correcting the first simulation model according to the flow field experimental result and the first flow field simulation result until the first simulation model meets a requirement; converting the first simulation model meeting the requirement into a second simulation model according to a first similarity criterion; the second simulation model is a simulation model under an SF6 atmosphere, the size of the second simulation model is the same as that of a GIS device and is larger than that of the physical model; performing simulation on the GIS device by using the second simulation model; the physical model and the first simulation model meet the following conditions: ； wherein is the gravitational acceleration, is the velocity of the fluid in the physical model, is the characteristic length of the physical model, is the velocity of the fluid in the first simulation model, is the characteristic length of the first simulation model.

2. The method of claim 1, wherein, the requirement comprises that a fluid in the physical model and a fluid in the first simulation model have the same flow direction and convection mode.

3. The method of claim 2, wherein, the requirement further comprises that a second similarity criterion of the physical model and the first simulation model is equal.

4. The method of claim 3, wherein, the second similarity criterion is a Froude number.

5. The method of claim 1, wherein, the first similarity criterion is a Galileo number.

6. The method of claim 1, wherein, The method of performing an experiment on a physical model in air to obtain a flow field experimental result comprises the following steps: passing a current into a to-be-tested conductor to heat the to-be-tested conductor; in a case where a stable temperature rise of the to-be-tested conductor reaches a preset value, performing shooting on a flow field of the to-be-tested conductor by using a schlieren observation system to obtain the flow field experimental result.

7. The method of claim 6, wherein, The schlieren observation system comprises a light source, two oppositely arranged concave mirrors and a schlieren camera; a light path of light emitted by the light source is in a Z shape and sequentially passes through the two concave mirrors to reach the schlieren camera; a part of the light path between the two concave mirrors passes through the flow field of the to-be-tested conductor.

8. An apparatus for simulating a flow field inside a GIS device, characterized by The method comprises the following steps: an experiment module is configured to perform an experiment on a physical model in air to obtain a flow field experimental result; a first simulation module is configured to perform simulation by using a first simulation model to obtain a first flow field simulation result; the first simulation model is a simulation model under an air atmosphere; a correction module is configured to correct the first simulation model according to the flow field experimental result and the first flow field simulation result until the first simulation model meets a requirement; a conversion module is configured to convert the first simulation model meeting the requirement into a second simulation model according to a first similarity criterion; the second simulation model is a simulation model under an SF6 atmosphere, the size of the second simulation model is the same as that of a GIS device and is larger than that of the physical model; a second simulation module is configured to perform simulation on the GIS device by using the second simulation model; the physical model and the first simulation model meet the following conditions: ； wherein is the gravitational acceleration, is the velocity of the fluid in the physical model, is the characteristic length of the physical model, is the velocity of the fluid in the first simulation model, is the characteristic length of the first simulation model.

9. A computer device, comprising: one or more processors and a memory are included, and the memory stores computer readable instructions, and the computer readable instructions are executed by the one or more processors to perform the steps of the simulation method in any one of claims 1 to 7.

10. A storage medium, characterized by The storage medium has stored therein computer readable instructions which, when executed by one or more processors, cause the one or more processors to perform the steps of the simulation method of any one of claims 1 to 7.

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