A rapid convergence simulation method, system and simulation analysis terminal for the temperature field of disconnectors

Abstract

The present invention discloses a rapid convergence simulation method, system and simulation analysis terminal for the temperature field of a disconnector, comprising the following steps: establishing a multi-physical field simulation coupling calculation model according to the geometric structure, material parameters and rated current of the disconnector; receiving the input pre-calculated forced wind speed value, setting the pre-calculated boundary conditions, and determining the pre-calculated flow field distribution numerical value of the disconnector based on the pre-calculated forced wind speed value and the pre-calculated boundary conditions according to the simulation coupling calculation model; judging whether the pre-calculation of the multi-physical field simulation coupling calculation model meets the convergence condition; taking the flow field distribution numerical value that meets the convergence condition as the initial condition, uniformly setting the inlet and outlet boundaries as open boundaries, and calculating the temperature field of the disconnector under natural convection conditions based on the multi-physical field simulation coupling calculation model. The rapid convergence simulation method and system of the present invention realize the rapid convergence of the temperature field calculation under natural convection conditions by pre-calculating the initial value of the flow field.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission and transformation, and particularly relates to a simulation method, system, and simulation analysis terminal for the temperature field of a disconnector with fast convergence under natural convection conditions. Background Art

[0002] The disconnector is the most used switching device in the power system and the traction power supply system. It is mainly used to isolate the power supply, perform switching operations, connect and disconnect small current circuits, and is installed on both sides of the circuit breaker and used in cooperation with the circuit breaker.

[0003] As a high-voltage switch product, the reliable performance of the disconnector directly affects the safety of the power grid. However, due to its tight sealing and compact structure, the internal conductor of the disconnector generates serious heat. Therefore, realizing the monitoring of the hot spot temperature of the disconnector is beneficial to timely understanding the operating state of the equipment, ensuring the reliability of the disconnector equipment, and is very important for the stable operation of the power system.

[0004] Due to the closed structure of the disconnector itself, it is difficult to directly measure the temperature of the internal conductor. In the prior art, the principles of heat transfer and fluid mechanics are used to study the thermodynamic problems inside power equipment, and a calculation method for obtaining the hot spot temperature of power equipment can be obtained by solving differential equations.

[0005] The simulation calculation of the disconnector temperature field has important physical significance for analyzing the fault characteristics and current-carrying capacity of the disconnector. However, in actual calculations, since the temperature calculation of the disconnector needs to be carried out under natural convection, and the calculation under natural convection is a strong coupling calculation of the temperature field and the fluid force field, that is, a multi-physical field simulation coupling calculation, its calculation process often faces convergence problems.

[0006] The convergence problem is mainly because the strong coupling multi-physical field simulation calculation is sensitive to the initial value. Generally, starting the calculation from the initial value of zero will result in non-convergence problems. Therefore, the selection of the initial value affects the strong coupling multi-physical field simulation calculation process of the disconnector temperature field and the fluid force field. Summary of the Invention

[0007] Based on this, in order to solve the technical problems existing in the prior art, the present invention proposes a simulation method, system, and simulation analysis terminal for the temperature field of a disconnector that can quickly converge the output of simulation analysis calculations under natural convection conditions.

[0008] In the first aspect, this embodiment provides a simulation method for the temperature field of a disconnector with fast convergence, including the following steps:

[0009] Establish a multi-physical field simulation coupling calculation model according to the geometric structure, material parameters, and rated current of the disconnector;

[0010] Receive the pre-calculated forced wind speed value as input, set the pre-calculated boundary conditions, and determine the pre-calculated flow field distribution value of the disconnector based on the pre-calculated forced wind speed value and the pre-calculated boundary conditions using the simulation coupling calculation model;

[0011] Judge whether the pre-calculation of the multi-physics field simulation coupling calculation model meets the convergence condition; when the convergence condition is not met, fine-tune the pre-calculated forced wind speed value until the convergence condition is met;

[0012] Take the flow field distribution value under the pre-calculated forced wind speed that meets the convergence condition as the initial condition, and uniformly set the inlet and outlet boundaries as open boundaries, and calculate the temperature field of the disconnector under natural convection conditions based on the multi-physics field simulation coupling calculation model.

[0013] In a second aspect, an embodiment of the present application provides a fast-converging disconnector temperature field simulation system, including a data modeling module, a preprocessing module, a convergence judgment module, and an assignment module:

[0014] The data modeling module is used to establish a multi-physics field simulation coupling calculation model according to the geometric structure, material parameters, and rated current of the disconnector;

[0015] The preprocessing module is used to receive the pre-calculated forced wind speed value as input, set the pre-calculated boundary conditions, and determine the pre-calculated flow field distribution value of the disconnector based on the pre-calculated forced wind speed value and the pre-calculated boundary conditions using the simulation coupling calculation model;

[0016] The convergence judgment module is used to judge whether the convergence of the pre-calculated flow field distribution value meets the convergence condition; when the convergence condition is not met, fine-tune the pre-calculated forced wind speed value until the convergence condition is met;

[0017] The assignment module is used to take the flow field distribution value under the forced wind speed that meets the convergence condition as the initial condition, uniformly set the inlet and outlet boundaries as open boundaries, and calculate the temperature field of the disconnector under natural convection conditions based on the multi-physics field simulation coupling calculation model.

[0018] In a third aspect, an embodiment of the present application provides a simulation analysis terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method provided in the first aspect above is implemented.

[0019] The fast-converging disconnector temperature field simulation method and system of the embodiments of the present application realize the fast convergence of the temperature field calculation under natural convection conditions by pre-calculating the flow field initial value that meets the model convergence condition and assigning it to the real-time calculation model. Description of the Drawings

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0021] Among them:

[0022] Figure 1 It is the main flowchart of the fast-converging disconnector temperature field simulation method of this embodiment;

[0023] Figure 2 It is the example flowchart of the fast-converging disconnector temperature field simulation method of this embodiment;

[0024] Figure 3 It is the geometric model of the multi-physical field simulation coupling calculation model of this embodiment;

[0025] Figure 4 It is the module structure diagram of the fast-converging disconnector temperature field simulation system of this embodiment;

[0026] Figure 5 It is the hardware structure block diagram of the simulation analysis terminal of this embodiment;

[0027] Figure 6 It is the flow velocity distribution diagram of the fluid force field in the pre-calculation of this embodiment;

[0028] Figure 7 It is the schematic diagram of the disconnector temperature calculation result under the specific pre-calculated forced wind speed value (0.1 m / s) of this embodiment;

[0029] Figure 8 It is the schematic diagram of the disconnector temperature calculation result under natural convection conditions of this embodiment. Detailed implementation manners

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] As used in the description and claims of this application and the above drawings, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or units inherent to these processes, methods, products or devices.

[0032] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of the application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0033] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this application without creative efforts shall fall within the scope of protection of this application.

[0034] Embodiment 1

[0035] As Figure 1 and Figure 3 shown, the natural convection condition-based rapid-convergence disconnector temperature field simulation method of the embodiments of this application is an executable program running on a PC or a server.

[0036] The rapid-convergence disconnector temperature field simulation method includes the following steps:

[0037] Step 1: Establish a multi-physical field simulation coupling calculation model according to the geometric structure, material parameters, and rated current of the disconnector 10.

[0038] Step 2: Receive the input pre-calculation forced wind speed value, set the pre-calculation boundary conditions and perform meshing, and determine the pre-calculation flow field distribution value of the disconnector 10 based on the pre-calculation forced wind speed value and the pre-calculation boundary conditions based on the simulation coupling calculation model. As Figure 6 shown in the flow force field distribution law diagram, the right side is the rate value comparison bar.

[0039] Step 3: Determine whether the pre-calculation of the multi-physical field simulation coupling calculation model meets the convergence condition. Please refer to Figure 2, in this embodiment, the recommended value of the initial pre-calculated forced wind speed is 0.1 m / s. Under this initial value, the model calculation results generally meet the convergence requirements.

[0040] Step 4: Compare the convergence of the function model with the convergence threshold under the flow field distribution values calculated by the current pre-calculated forced wind speed. When the convergence condition is not met, fine-tune the pre-calculated forced wind speed value, and then return to Step 3 for re-operation until the fine-tuned pre-calculated forced wind speed value meets the convergence condition; if it meets the convergence condition, proceed to Step 5. For example, take the forced wind speed as the recommended value of 0.1 m / s, and perform the multi-physics simulation coupling calculation model. Determine whether the model calculation results meet the convergence requirements. If not, increase the recommended value by 0.01 m / s and return to the previous step for verification.

[0041] Step 5: Use the flow field distribution values under the pre-calculated forced wind speed that meets the convergence condition as the initial conditions, and uniformly set the inlet and outlet boundaries as open boundaries. Based on this multi-physics simulation coupling calculation model, calculate the temperature field under the natural convection condition of the disconnector 10.

[0042] By using the flow field initial values that meet the model convergence conditions through the above pre-calculation and assigning them to the real-time calculation model, the rapid convergence of the temperature field calculation under natural convection conditions is achieved.

[0043] Please refer to Figure 3 together, where the pre-calculated boundary condition is to establish a geometric space model. The three-dimensional space boundary: the first surface and the second surface perpendicular to gravity are used as the inlet boundary and the outlet boundary, and the third to sixth surfaces parallel to gravity are used as the slip boundaries.

[0044] In Step 1, the step of establishing the multi-physics simulation coupling calculation model according to the geometric structure, material parameters, and rated current of the disconnector 10 includes:

[0045] Control equations:

[0046]

[0047] Thermodynamic equations:

[0048]

[0049] Among them, the heat balance equation is:

[0050] Q = Q I +Q sun -Q con -Q rad Formula (3)

[0051] Among them, ρ air air density around the disconnector; Air flow velocity around the disconnector; p - air pressure around the disconnector; Unit vector; C p，air Specific heat capacity of air around the disconnector; T - temperature of air or the disconnector; C p，wire Specific heat capacity of the disconnector; Q - heat source, unit is watt per cubic meter; Q I Heat generated by the disconnector itself through current; Q sun Heat generated due to solar radiation; Q con Heat dissipated by convection of the disconnector; Q rad Represents the heat dissipation by radiation of the disconnector, and satisfies the Stefan - Boltzmann radiation law.

[0052] Such as Figure 2 As shown, the inlet flow velocity at the inlet boundary and the outlet boundary is selected from the range of 0.1 m / s - 2 m / s, including any value between the end points of the range.

[0053] The opening boundary is as follows:

[0054]

[0055] Wherein, P hydro Pressure generated due to height for boundary compensation, ρ ref Reference density of air around the disconnector, g - acceleration due to gravity, r - position point for compensation on the boundary, r ref Coordinate position of the reference point, generally defaulted to the position of (0, 0, 0), heat generated by the disconnector itself through current, p - air pressure around the disconnector, Unit vector, Air flow velocity around the disconnector, n - normal direction of the interface, f 0 Is the pressure applied outside the boundary.

[0056] Embodiment 2

[0057] Please refer to Figure 4 As shown, the fast - converging disconnector temperature field simulation system 50 of this embodiment includes a data modeling module 51, a pre - processing module 52, a convergence judgment module 53, and an assignment module 54:

[0058] The data modeling module 51 is used to establish a multi - physical - field simulation coupling calculation model according to the geometric structure, material parameters, and rated current of the disconnector.

[0059] The pre - processing module 52 is used to receive the input pre - calculated forced wind speed value, set the pre - calculated boundary conditions, and determine the pre - calculated flow field distribution value of the disconnector based on the pre - calculated forced wind speed value and the pre - calculated boundary conditions according to the simulation coupling calculation model.

[0060] The convergence judgment module 53 is used to judge whether the convergence of the pre-calculated flow field distribution value meets the convergence condition; when the convergence condition is not met, the pre-calculated forced wind speed value is finely adjusted until the convergence condition is met.

[0061] The assignment module 54 is used to use the flow field distribution value under the forced wind speed that meets the convergence condition as the initial condition, and the inlet and outlet boundaries are uniformly set as open boundaries, and the temperature field under the natural convection condition of the disconnector is calculated based on the multi-physics simulation coupling calculation model.

[0062] The pre-calculated boundary condition is to establish a three-dimensional space boundary:

[0063] Taking the first surface and the second surface perpendicular to gravity as the inlet boundary and the outlet boundary, and the third to sixth surfaces parallel to gravity as the slip boundary to simulate the test boundary of the static contact. The inlet flow rate of the inlet boundary and the outlet boundary is selected from any value within the range including the end points of 0.1 m / s - 2 m / s.

[0064] As Figure 5 shown, the simulation analysis terminal 600 of this embodiment is shown.

[0065] The simulation analysis terminal 600 includes a central processing unit (CPU) 601, which can execute various appropriate actions and processes according to computer program instructions stored in a read-only memory (ROM) or computer program instructions loaded from a storage unit into a random access memory (RAM). In the RAM, various programs and data required for device operation can also be stored. The CPU, ROM, and RAM are connected to each other through a bus. An input / output (I / O) interface 602 is also connected to the bus.

[0066] Multiple components in the device are connected to the I / O interface, including: an input unit 603, such as a keyboard, a mouse, etc.; an output unit 604, such as various types of displays, speakers, etc.; a storage unit 605, such as a disk, an optical disc, etc.; and a communication unit, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 606 allows the device to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0067] The processing unit executes the various methods and processes described above, such as method steps 1 to 5. For example, in some embodiments, method steps 1 to 5 may be implemented as a computer software program tangibly embodied in a machine-readable medium, such as a storage unit. In some embodiments, part or all of the computer program may be loaded and / or installed onto the device via the ROM and / or the communication unit. When the computer program is loaded into the RAM and executed by the CPU, one or more of the method steps 1 to 5 described above may be performed. Alternatively, in other embodiments, the CPU may be configured to execute method steps 1 to 5 by any other suitable means (e.g., by means of firmware).

[0068] The functions described above herein may be performed at least in part by one or more hardware logic components. By way of example, and without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on a chip (SOCs), complex programmable logic devices (CPLDs), and the like.

[0069] The program code for implementing the methods of the present invention may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, a special purpose computer, or other programmable data processing apparatus such that the program codes, when executed by the processor or controller, cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine, or entirely on the remote machine or server.

[0070] In the context of the present invention, a machine-readable medium may be a tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. A machine-readable medium may be either a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0071] The above-disclosed is only the preferred embodiment of the present invention. Of course, it cannot be used to limit the scope of the rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A simulation method for the temperature field of a disconnector with fast convergence, characterized in that, it includes the following steps: Establish a multi-physical field simulation coupling calculation model according to the geometric structure, material parameters, and rated current of the disconnector; Receive the input pre-calculated forced wind speed value, set the pre-calculated boundary conditions, and determine the pre-calculated flow field distribution value of the disconnector based on the pre-calculated forced wind speed value and the pre-calculated boundary conditions according to the simulation coupling calculation model; Judge whether the pre-calculation of the multi-physical field simulation coupling calculation model meets the convergence condition; When the convergence condition is not met, fine-tune the pre-calculated forced wind speed value until the convergence condition is met; Take the flow field distribution value under the pre-calculated forced wind speed that meets the convergence condition as the initial condition, and uniformly set the inlet and outlet boundaries as open boundaries, and calculate the temperature field of the disconnector under natural convection conditions based on the multi-physical field simulation coupling calculation model; Among them, the step of establishing a multi-physical field simulation coupling calculation model according to the geometric structure, material parameters, and rated current of the disconnector includes: Control equations: Thermodynamic equations: Among them, the heat balance equation is: Q = Q I +Q sun -Q con -Q rad Formula (3) Among them, ρ air Air density around the disconnector; Air flow velocity around the disconnector; p is the air pressure around the disconnector; Unit vector; C p，air Specific heat capacity of the air around the disconnector; T is the temperature of the air or the disconnector; C p，wire Specific heat capacity of the disconnector; Q is the heat source, with the unit of watt per cubic meter; Q I Is the heat generated by the disconnector through the current itself; Q sun Is the heat generated due to solar radiation; Q con Is the heat dissipated by convection of the disconnector; Q rad Represents the heat dissipation of the disconnector by radiation, and satisfies the Stefan-Boltzmann radiation law.

2. The simulation method for the temperature field of a disconnector with fast convergence according to claim 1, characterized in that, The pre-calculated boundary condition is to establish a three-dimensional space boundary: Take the first surface and the second surface perpendicular to gravity as the inlet boundary and the outlet boundary, and the third to sixth surfaces parallel to gravity as the slip boundary.

3. The simulation method for the temperature field of a disconnector with fast convergence according to claim 2, characterized in that, The inlet flow velocity of the inlet boundary and the outlet boundary is selected from the range of 0.1 m / s to 2 m / s, including any value between the end point ranges.

4. The simulation method for the temperature field of a disconnector with fast convergence according to claim 1, characterized in that, The open boundary is as follows: Among them, P hydro The pressure caused by height for boundary compensation, ρ ref The reference air density around the disconnector, g gravitational acceleration, r the position point compensated on the boundary, r ref The coordinate position of the reference point, generally defaulted to the position of (0, 0, 0), the heat generated by the current passing through the disconnector itself, p the air pressure around the disconnector, Unit vector, The air flow velocity around the disconnector, n the normal direction of the interface, f 0 Is the pressure applied outside the boundary.

5. A simulation system for the temperature field of a disconnector with fast convergence, characterized in that, it includes a data modeling module, a preprocessing module, a convergence judgment module, and an assignment module: The data modeling module is used to establish a multi-physical field simulation coupling calculation model according to the geometric structure, material parameters, and rated current of the disconnector; The preprocessing module is used to receive the input pre-calculated forced wind speed value, set the pre-calculated boundary conditions, and determine the pre-calculated flow field distribution value of the disconnector based on the pre-calculated forced wind speed value and the pre-calculated boundary conditions according to the simulation coupling calculation model; The convergence judgment module is used to judge whether the convergence of the pre-calculated flow field distribution value meets the convergence condition; when the convergence condition is not met, fine-tune the pre-calculated forced wind speed value until the convergence condition is met; The assignment module is used to take the flow field distribution value under the forced wind speed that meets the convergence condition as the initial condition, uniformly set the inlet and outlet boundaries as open boundaries, and calculate the temperature field of the disconnector under natural convection conditions based on the multi-physical field simulation coupling calculation model; Among them, the step of the data modeling module establishing a multi-physical field simulation coupling calculation model according to the geometric structure, material parameters, and rated current of the disconnector includes: Control equations: Thermodynamic equations: Among them, the heat balance equation is: Q = Q I +Q sun -Q con -Q rad Formula (3) Among them, ρ air Air density around the disconnector; Air flow velocity around the disconnector; p is the air pressure around the disconnector; Unit vector; C p，air Specific heat capacity of air around the disconnector; T is the temperature of air or the disconnector; C p，wire Specific heat capacity of the disconnector; Q is the heat source, with the unit of watt per cubic meter; Q I is the heat generated by the disconnector itself through the current; Q sun is the heat generated due to solar radiation; Q con is the heat dissipated by convection of the disconnector; Q rad represents the heat dissipated by radiation of the disconnector, and satisfies the Stefan-Boltzmann radiation law.

6. The fast-converging disconnector temperature field simulation system according to claim 5, characterized in that, the pre-computed boundary conditions are to establish a three-dimensional space boundary: using the first surface and the second surface perpendicular to gravity as the inlet boundary and the outlet boundary, and the third to sixth surfaces parallel to gravity as the slip boundary to simulate the test boundary of the static contact the inlet flow velocity of the inlet boundary and the outlet boundary is selected from any value within the range of 0.1 m / s to 2 m / s including the endpoint ranges.

7. The fast-converging disconnector temperature field simulation system according to claim 5, characterized in that, the opening boundary is as follows: Among them, P hydro The pressure caused by height for boundary compensation, ρ ref The reference air density around the disconnector, g the acceleration due to gravity, r the compensated position point on the boundary, r ref The coordinate position of the reference point, generally defaulted to the position of (0, 0, 0), the heat generated by the current passing through the disconnector itself, p the air pressure around the disconnector, Unit vector, The air flow velocity around the disconnector, n the normal direction of the interface, f 0 is the pressure applied outside the boundary.

8. A simulation analysis terminal, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, when the processor executes the computer program, the method described in any one of claims 1-4 is implemented.

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