A simulation method, system, terminal, and dielectric for surface charge of a basin-type insulator

Abstract

This invention relates to the field of electrical performance research technology for insulating materials, and discloses a simulation method, system, terminal, and medium for surface charge of basin-type insulators. By acquiring gas-side dark current data, a simulation model of surface charge of basin-type insulators is constructed, and the gas-side dark current data is set as the boundary conditions of the physical field of the simulation model. This enables the calculation of surface charge distribution characteristics under arbitrary gases and pressures, without being limited by the existing limitations of diffusion coefficients, recombination coefficients, ion pair generation rates, and migration coefficients of positive and negative ions in gases. The physical field calculation model is solved according to the boundary conditions in the adaptive mesh division to obtain the charge distribution and electric field distribution characteristics, thus completing the simulation of surface charge of basin-type insulators. This improves the computational efficiency and the accuracy of simulating the surface charge distribution characteristics and spatiotemporal evolution of key insulating components in DC GIS / GIL.

Description

Technical Field

[0001] This invention relates to the field of electrical performance research technology of insulating materials, specifically to a simulation method and system, terminal and medium for surface charge of a basin-type insulator. Background Technology

[0002] The development of DC power transmission can promote the clean and efficient development and utilization of various energy sources and facilitate the optimal allocation of energy resources. Using DC gas-insulated switchgear (GIS) can reduce the volume by more than 70% compared to open-type equipment, reduce the volume of offshore platforms by more than 10%, and reduce the volume of onshore converter stations by more than 70%.

[0003] In DC GIS / GIL equipment, under the long-term influence of unipolar DC voltage, charges gradually migrate and accumulate on the insulator surface under the influence of electric field lines. The accumulation of charges at the gas-solid interface can cause distortion of the electric field on the insulator surface, and even trigger surface flashover. Especially under polarity reversal conditions, the accumulated surface charge can lead to a decrease in the surface flashover voltage, causing basin insulator failure and affecting the safe and stable operation of DC transmission equipment. Therefore, it is necessary to conduct high-precision simulations of the distribution characteristics and spatiotemporal evolution of surface charges on DC GIS / GIL insulators. Currently, scholars generally believe that there are three pathways for the accumulation of surface charges on insulators under DC voltage:

[0004] (1) The gas-solid interface method transmits the electric field to the solid side;

[0005] (2) Gas-solid interface method for conduction to the gas side under the action of electric field;

[0006] (3) Surface conduction under the action of tangential electric field at the gas-solid interface.

[0007] Existing simulations often model insulator charges under ideal conditions, calculating gas-side currents based on the diffusion coefficients, recombination coefficients, ion pair formation rates, and migration coefficients of positive and negative ions. However, the roughness of the metal conductor is also a significant factor affecting gas-side currents, but the modeling scale of the metal conductor's roughness characteristics differs greatly from that of the insulator, failing to reflect the influence of the metal conductor's surface properties on charge distribution. Furthermore, current simulations lack data on the diffusion coefficients, recombination coefficients, ion pair formation rates, and migration coefficients of positive and negative ions for various gas, pressure, and electric field strength conditions. Therefore, it is necessary to establish a high-precision simulation method for insulator surface charges based on gas-side dark currents. Summary of the Invention

[0008] In order to overcome the defects of the prior art, the present invention aims to provide a simulation method, system, terminal and medium for surface charge of basin insulators, so as to solve the technical problem that the existing technology cannot accurately simulate the surface charge distribution characteristics and spatiotemporal evolution law of key insulating components in DC GIS / GIL.

[0009] This invention is achieved through the following technical solution:

[0010] In a first aspect, the present invention provides a method for simulating the surface charge of a basin-type insulator, comprising:

[0011] Acquire gas-side dark current data;

[0012] A simulation model of surface charge on a basin-type insulator was constructed, and the acquired gas-side dark current data was set as the boundary conditions of the physical field of the simulation model of surface charge on a basin-type insulator.

[0013] Adaptive mesh generation is performed in the simulation model of surface charge of basin insulators;

[0014] The physical field calculation model is solved according to the boundary conditions in the adaptive mesh division to obtain the charge distribution and electric field distribution characteristics, and the surface charge simulation of the basin insulator is completed.

[0015] Preferably, a dark current measurement platform is built based on the operation of DC GIS / GIL, wherein the dark current measurement platform is a coaxial electrode structure or a three-electrode structure.

[0016] Preferably, the measured gas-side dark current is data under the coupling effect of electric and thermal fields, which is consistent with the actual operating conditions of DC GIS / GIL.

[0017] Preferably, the construction process of the simulation model of surface charge of basin-type insulator is as follows:

[0018] A simulation model of the surface charge of a basin insulator was obtained by coupling gas conduction, solid conduction, surface conduction and Poisson equation in the electrostatic module and Fourier heat transfer, Navier-Stokes equation and energy emission equation in the heat transfer module using COMSOL simulation software.

[0019] Preferably, the gas-side dark current data, which varies with field strength and temperature, is input into the boundary conditions for surface charge accumulation on the electrostatic module, serving as the boundary conditions for the physical field of the simulation model of surface charge on the basin insulator.

[0020] Preferably, the physical field calculation model is solved using the divided adaptive mesh based on the boundary conditions to obtain the surface charge density distribution and electric field distribution characteristics of the insulator, wherein the calculation formula is as follows:

[0021]

[0022] In the formula, J v For solid-side conduction current, J G γ is the gas-side conduction current density. s E represents the surface resistivity of the insulating material. t denoted as electric field strength.

[0023] Furthermore, the solid-side conduction current J v The calculation formula is as follows:

[0024]

[0025] In the formula, D is the electric flux density; E is the normal electric field strength of the basin insulator; γ V is the volume conductivity.

[0026] Secondly, the present invention also provides a simulation system for surface charge of a basin-type insulator, based on the above-described simulation method for surface charge of a basin-type insulator, comprising:

[0027] The acquisition module is used to acquire gas-side dark current data;

[0028] The module is used to build a simulation model of surface charge on a basin insulator, and the acquired gas-side dark current data is set as the boundary conditions of the physical field of the simulation model of surface charge on a basin insulator.

[0029] The mesh generation module is used for adaptive mesh generation in the simulation model of surface charge of basin insulators.

[0030] The calculation module is used to solve the physical field calculation model according to the boundary conditions in the divided adaptive mesh, obtain the charge distribution and electric field distribution characteristics, and complete the surface charge simulation of the basin insulator.

[0031] Thirdly, the present invention also provides a mobile terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the steps of the simulation method for surface charge of a basin-type insulator as described above.

[0032] Fourthly, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the simulation method for surface charge of a basin-type insulator as described above.

[0033] Compared with the prior art, the present invention has the following beneficial technical effects:

[0034] This invention provides a simulation method for the surface charge of a basin-type insulator. By acquiring gas-side dark current data, a simulation model of the surface charge of the basin-type insulator is constructed. The gas-side dark current data is set as the boundary conditions of the physical field of the simulation model, enabling the calculation of surface charge distribution characteristics under arbitrary gases and pressures. This method is not limited by the existing limitations of parameters such as diffusion coefficient, recombination coefficient, ion pair generation rate, and migration coefficient of positive and negative ions in gases. The physical field calculation model is solved according to the boundary conditions in the adaptive mesh, obtaining the charge distribution and electric field distribution characteristics, thus completing the simulation of the surface charge of the basin-type insulator. This method effectively removes the difficult-to-converge calculation part of the gas-side current, saves calculation time, improves calculation efficiency, and enhances the accuracy of simulating the surface charge distribution characteristics and spatiotemporal evolution of key insulating components in DC GIS / GIL.

[0035] Furthermore, a dark current measurement platform was built based on the operation of DC GIS / GIL. The dark current measurement platform has a coaxial electrode structure or a three-electrode structure to ensure that the roughness and processing technology of the electrodes are consistent with the actual DC GIS / GIL, so as to effectively reflect the surface state of the metal material and accurately reflect the dark current characteristics of the gas under actual operation.

[0036] Furthermore, a simulation model of the surface charge of a basin insulator was obtained by coupling the gas conduction, solid conduction, surface conduction, and Poisson equation in the electrostatic module with the Fourier heat transfer, Navier-Stokes equation, and energy emission equation in the heat transfer module using COMSOL simulation software. The surface charge characteristics of the basin insulator were calculated through the simulation model, and the part that was difficult to converge by calculating the gas-side current using charge generation, migration, diffusion, and recombination was removed, thus improving the accuracy of the simulation results.

[0037] Furthermore, the gas-side dark current data, which varies with field strength and temperature, is input into the boundary conditions for surface charge accumulation on the electrostatic module. As the boundary conditions of the physical field of the simulation model of surface charge on the basin insulator, it is possible to calculate the surface charge distribution characteristics under any gas and pressure, without being limited by the existing limitations of the diffusion coefficient, recombination coefficient, ion pair generation rate, and migration coefficient parameters of positive and negative ions in the gas. Attached Figure Description

[0038] Figure 1 This is a flowchart of the simulation method for surface charge of basin-type insulators in this invention;

[0039] Figure 2 This is a schematic diagram of the simulation system structure for the surface charge of the basin-type insulator in this invention;

[0040] Figure 3 This is a schematic diagram illustrating the calculation results of the surface charge distribution characteristics of a basin-type insulator under a certain voltage in an embodiment of the present invention;

[0041] Figure 4 This refers to the surface charge accumulation characteristics at the boundary of the basin-type insulator in this invention.

[0042] In the diagram: 1-Acquisition module; 2-Construction module; 3-Mesh generation module; 4-Calculation module. Detailed Implementation

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] The present invention will now be described in further detail with reference to the accompanying drawings:

[0046] The purpose of this invention is to provide a simulation method, system, terminal, and medium for the surface charge of a basin-type insulator, in order to solve the technical problem that the existing technology cannot accurately simulate the surface charge distribution characteristics and spatiotemporal evolution law of key insulating components in DC GIS / GIL.

[0047] See Figure 1 In one embodiment of the present invention, a method for simulating the surface charge of a basin-type insulator is provided, comprising the following steps:

[0048] Step 1: Obtain gas-side dark current data;

[0049] Specifically, a dark current measurement platform is built based on the operation of DC GIS / GIL. The dark current measurement platform has a coaxial electrode structure or a three-electrode structure to ensure that the electrode roughness and processing technology are consistent with the actual DC GIS / GIL.

[0050] Among them, the gas-side dark current data were obtained by measuring the electric field intensity inside the DC GIS / GIL under actual operating conditions.

[0051] In this embodiment, the gas pressure and temperature gradient inside the DC GIS / GIL under actual operating conditions can also be considered to measure the gas dark current that has a mapping relationship with the gas pressure and temperature.

[0052] The mapping relationship between electric field strength, gas pressure, temperature and gas dark current can be represented by mathematical expressions or black box models.

[0053] Step 2: Construct a simulation model of surface charge on a basin-type insulator, and set the acquired gas-side dark current data as the boundary conditions of the physical field of the simulation model of surface charge on a basin-type insulator.

[0054] Specifically, the construction process of the simulation model of surface charge of basin-type insulators is as follows:

[0055] A simulation model of the surface charge of a basin insulator was obtained by coupling gas conduction, solid conduction, surface conduction and Poisson equation in the electrostatic module and Fourier heat transfer, Navier-Stokes equation and energy emission equation in the heat transfer module using COMSOL simulation software.

[0056] In this embodiment, the simulation model of surface charge of basin insulator is based on the structural dimensions of basin insulator or post insulator in DC GIS / GIL, including the metal shield and the central guide rod.

[0057] In this embodiment, the gas dark current measurement platform uses a coaxial electrode structure to test the dark current in air at 25°C and 0.5 MPa. The roughness of the high-voltage conductor is 3 μm. The measured gas dark current changes with the electric field strength as follows: Figure 3 As shown.

[0058] Specifically, the gas-side dark current data as a function of the electric field strength is interpolated and input into the boundary conditions of surface charge accumulation on the electrostatic module as the boundary conditions of the physical field of the simulation model of surface charge on the basin insulator.

[0059] Step 3: Perform adaptive mesh generation in the surface charge simulation model of the basin insulator;

[0060] Step 4: Solve the physical field calculation model according to the boundary conditions in the divided adaptive mesh to obtain the charge distribution and electric field distribution characteristics, and complete the surface charge simulation of the basin insulator.

[0061] Specifically, in the adaptive mesh generation, the physical field calculation model is solved according to the boundary conditions to obtain the surface charge distribution and electric field distribution characteristics of the insulator, where the calculation formula is as follows:

[0062]

[0063] In the formula, J v For solid-side conduction current, J G γ is the gas-side conduction current density. s Let be the surface resistivity of the insulating material, and be the electric field strength.

[0064] Specifically, the solid-side conduction current J v The calculation formula is as follows:

[0065]

[0066] In the formula, D is the electric flux density; E is the normal electric field strength of the basin insulator; γ V is the volume conductivity.

[0067] In this embodiment, the calculation uses a transient calculation method to obtain 0-10. 7 Within s, the process of surface charge accumulation on the basin insulator during the transition from initial capacitive to steady-state resistive behavior is described. To improve computational accuracy, an adaptive mesh is used for subsequent calculations. The calculated surface charge accumulation characteristics at the basin insulator boundary under steady-state conditions are as follows: Figure 4 As shown

[0068] In summary, this invention provides a simulation method for the surface charge of a basin-type insulator. By acquiring gas-side dark current data, a simulation model of the surface charge of the basin-type insulator is constructed, and the gas-side dark current data is set as the boundary condition of the physical field of the simulation model. This enables the calculation of the surface charge distribution characteristics under arbitrary gas and pressure, without being limited by the existing limitations of the diffusion coefficient, recombination coefficient, ion pair generation rate, and migration coefficient parameters of positive and negative ions in the gas. The physical field calculation model is solved according to the boundary conditions within the adaptive mesh, obtaining the charge distribution and electric field distribution characteristics, thus completing the simulation of the surface charge of the basin-type insulator. This effectively eliminates the difficult-to-converge calculation of the gas-side current, saving computation time, improving computational efficiency, and enhancing the accuracy of simulating the surface charge distribution characteristics and spatiotemporal evolution of key insulating components in DC GIS / GIL.

[0069] Example 2

[0070] This invention provides a simulation system for surface charge of a basin-type insulator, based on the aforementioned simulation method for surface charge of a basin-type insulator, comprising:

[0071] Acquisition module 1 is used to acquire gas-side dark current data;

[0072] Module 2 is used to build a simulation model of surface charge on a basin insulator, and the acquired gas-side dark current data is set as the boundary conditions of the physical field of the simulation model of surface charge on a basin insulator.

[0073] Mesh generation module 3 is used for adaptive mesh generation in the simulation model of surface charge of basin insulators;

[0074] Calculation module 4 is used to solve the physical field calculation model according to the boundary conditions in the divided adaptive mesh, obtain the charge distribution and electric field distribution characteristics, and complete the surface charge simulation of the basin insulator.

[0075] Example 3

[0076] The present invention also provides a mobile terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, such as a simulation program for surface charge of a basin insulator.

[0077] When the processor executes the computer program, it implements the steps of the above-described method for simulating the surface charge of a basin-type insulator, for example:

[0078] Acquire gas-side dark current data;

[0079] A simulation model of surface charge on a basin-type insulator was constructed, and the acquired gas-side dark current data was set as the boundary conditions of the physical field of the simulation model of surface charge on a basin-type insulator.

[0080] Adaptive mesh generation is performed in the simulation model of surface charge of basin insulators;

[0081] The physical field calculation model is solved according to the boundary conditions in the adaptive mesh division to obtain the charge distribution and electric field distribution characteristics, and the surface charge simulation of the basin insulator is completed.

[0082] Alternatively, when the processor executes the computer program, it implements the functions of each module in the above system, for example:

[0083] Acquisition module 1 is used to acquire gas-side dark current data;

[0084] Module 2 is used to build a simulation model of surface charge on a basin insulator, and the acquired gas-side dark current data is set as the boundary conditions of the physical field of the simulation model of surface charge on a basin insulator.

[0085] Mesh generation module 3 is used for adaptive mesh generation in the simulation model of surface charge of basin insulators;

[0086] Calculation module 4 is used to solve the physical field calculation model according to the boundary conditions in the divided adaptive mesh, obtain the charge distribution and electric field distribution characteristics, and complete the surface charge simulation of the basin insulator.

[0087] For example, the computer program may be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which describe the execution process of the computer program in the mobile terminal.

[0088] For example, the computer program can be divided into an acquisition module 1, a construction module 2, a mesh generation module 3, and a calculation module 4;

[0089] The specific functions of each module are as follows:

[0090] Acquisition module 1 is used to acquire gas-side dark current data;

[0091] Module 2 is used to build a simulation model of surface charge on a basin insulator, and the acquired gas-side dark current data is set as the boundary conditions of the physical field of the simulation model of surface charge on a basin insulator.

[0092] Mesh generation module 3 is used for adaptive mesh generation in the simulation model of surface charge of basin insulators;

[0093] Calculation module 4 is used to solve the physical field calculation model according to the boundary conditions in the divided adaptive mesh, obtain the charge distribution and electric field distribution characteristics, and complete the surface charge simulation of the basin insulator.

[0094] The mobile terminal can be a computing device such as a desktop computer, laptop, handheld computer, or cloud server. The mobile terminal may include, but is not limited to, a processor and memory.

[0095] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the mobile terminal, connecting various parts of the mobile terminal via various interfaces and lines.

[0096] The memory can be used to store the computer program and / or module. The processor implements various functions of the mobile terminal by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory.

[0097] The memory may primarily include a program storage area and a data storage area. The program storage area may store the operating system and at least one application program required for a given function (such as sound playback or image playback). The data storage area may store data created based on the use of the phone (such as audio data or a phonebook). Furthermore, the memory may include high-speed random access memory (RAM) and non-volatile memory, such as hard disks, RAM, plug-in hard disks, SmartMediaCards (SMC), Secure Digital (SD) cards, flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0098] Example 4

[0099] The present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the simulation method for surface charge of a basin-type insulator.

[0100] If the modules / units integrated in the mobile terminal are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.

[0101] Based on this understanding, all or part of the processes in the above method can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the steps of the above-described simulation method for surface charge of a basin-type insulator. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form.

[0102] The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0103] It should be noted that the content contained in the computer-readable medium may be appropriately added to or subtracted from the content as required by the legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium may not include electrical carrier signals and telecommunication signals.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for simulating surface charge of a basin-type insulator, characterized in that, include: Acquire gas-side dark current data; A simulation model of surface charge on a basin-type insulator was constructed, and the acquired gas-side dark current data was set as the boundary conditions of the physical field of the simulation model of surface charge on a basin-type insulator. Adaptive mesh generation is performed in the simulation model of surface charge of basin insulators; The physical field calculation model is solved according to the boundary conditions in the adaptive mesh division to obtain the charge distribution and electric field distribution characteristics, and to complete the surface charge simulation of the basin insulator. A dark current measurement platform was built based on the operation of DC GIS and DC GIL, wherein the dark current measurement platform is a coaxial electrode structure or a three-electrode structure. The construction process of the simulation model of surface charge of the basin-type insulator is as follows: A simulation model of surface charge of a basin insulator was obtained by coupling gas conduction, solid conduction, surface conduction and Poisson equation in the electrostatic module and Fourier heat transfer, Navier-Stokes equation and energy emission equation in the heat transfer module using COMSOL simulation software. The gas-side dark current data, which varies with field strength and temperature, is input into the boundary conditions for surface charge accumulation on the electrostatic module, serving as the boundary conditions for the physical field of the simulation model of surface charge on the basin insulator.

2. The method for simulating surface charge of a basin-type insulator according to claim 1, characterized in that, The measured gas-side dark current is data under the coupling effect of electric and thermal fields, which is consistent with the actual operating conditions of DC GIS and DC GIL.

3. The method for simulating surface charge of a basin-type insulator according to claim 1, characterized in that, The physical field calculation model is solved using the adaptive mesh based on the boundary conditions to obtain the surface charge density distribution characteristics of the insulator, where the calculation formula is as follows: In the formula, J v For solid-side conduction current, J G The gas-side conduction current density, γ s The surface resistivity of the insulating material. E t denoted as electric field strength.

4. The simulation method for surface charge of a basin-type insulator according to claim 3, characterized in that, The solid-side conduction current J v The calculation formula is as follows: In the formula, D Electric flux density; E The normal electric field strength of the basin-type insulator; γ V is the volume conductivity.

5. A simulation system for surface charge of a basin-type insulator, based on the simulation method for surface charge of a basin-type insulator according to any one of claims 1-4, characterized in that, include: Acquisition module (1) is used to acquire gas-side dark current data; Module (2) is used to construct a simulation model of surface charge of basin insulators and set the acquired gas-side dark current data as the boundary conditions of the physical field of the simulation model of surface charge of basin insulators. Mesh generation module (3) is used for adaptive mesh generation in the simulation model of surface charge of basin insulator; The calculation module (4) is used to solve the physical field calculation model according to the boundary conditions in the divided adaptive mesh, obtain the charge distribution and electric field distribution characteristics, and complete the surface charge simulation of the basin insulator.

6. A mobile 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, it implements the steps of the simulation method for surface charge of a basin-type insulator as described in any one of claims 1-4.

7. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the simulation method for surface charge of a basin-type insulator as described in any one of claims 1-4.

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