Multi-parameter multi-physics field simulation calculation method for high-voltage submarine cable

Abstract

The invention discloses a high-voltage submarine cable multi-parameter multi-physics field simulation calculation method, system, device, medium and program, and belongs to the technical field of cable detection. The method comprises the following steps: according to a submarine cable structure, establishing initial finite element models of soil direct burial, a seabed, a cable trench and a transition section; according to the initial finite element model, mesh generation is carried out on the submarine cable cross section, and a finite element simulation model after mesh generation is established; performing multi-physical field coupling calculation through the finite element simulation model after mesh generation to obtain the temperature of the submarine cable, and performing simulation calculation of the submarine cable core according to the temperature of the submarine cable; and comparing the cable core temperature of the submarine cable in the simulation calculation result with the temperature measured in an optical fiber temperature measuring device arranged in the submarine cable to obtain a simulation error and an actual error. According to the method, the distribution conditions of the temperature field, the magnetic field and the fluid velocity field around the cable and the temperature change condition of the laying transition section can be observed simultaneously, and the temperature of the submarine cable during change is obtained.

Description

Technical Field

[0001] This invention belongs to the field of cable testing technology, specifically relating to a multi-parameter multi-physics field simulation calculation method, system, equipment, medium, and program for high-voltage submarine cables. Background Technology

[0002] Submarine cables in actual operation are typically laid in various ways, including direct burial in soil, subsea laying, and cable trench laying. The operating environment is complex and differs from that of terrestrial cables. Because the cable core and armor layer of a submarine cable cannot be cross-interconnected, a considerable induced circulating current is generated during operation. This circulating current produces significant Joule losses, causing the temperature of the submarine cable to rise, accelerating insulation aging, and reducing its current carrying capacity. Furthermore, abnormal operating conditions such as transient overvoltages and abnormal grounding of the metal sheath and armor layer can lead to instantaneous overheating, further causing thermal aging damage to the main insulation of the submarine cable, severely impacting the reliability of high-voltage submarine cable operation.

[0003] The main methods for calculating the thermal field and current carrying capacity of submarine cables include experimental testing, analytical calculation, and numerical calculation. Numerical calculation is suitable for more complex systems, can couple multiple physical fields, and yields more accurate results, making it widely used in submarine cable thermal field and current carrying capacity calculations. Publication number CN111382531A proposes a finite element method for calculating the current carrying capacity and temperature field of a three-core high-voltage AC submarine cable, but its applicability is limited and it does not address different laying conditions. Publication number CN107506543A describes a multi-physics coupling calculation method for high-voltage DC submarine cables laid on the seabed. Publication number CN117669296A explains the calculation method for the current carrying capacity and temperature field of submarine cables under different specifications of protective sleeves and different electrode spacings. Publication number CN111027246B explains the finite element simulation method for 500kV oil-filled submarine cables and performs modeling analysis for four different laying simulations. Most current studies only conduct simulation analysis for a single laying condition, making it difficult to accurately simulate the temperature bottleneck of submarine cables when laying conditions change. Summary of the Invention

[0004] To address the problem that existing technologies, which are limited to simulations of a single laying condition, struggle to accurately simulate the temperature of submarine cables under varying laying conditions, this invention provides a multi-parameter, multi-physics simulation method for high-voltage submarine cables. This method allows simultaneous observation of the distribution of temperature, magnetic field, and fluid velocity fields around the cable, as well as temperature changes during the laying transition section, thus obtaining the temperature of the submarine cable under changing laying conditions.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] In a first aspect, the present invention provides a multi-parameter, multi-physics simulation calculation method for high-voltage submarine cables, comprising: Based on the submarine cable structure, initial finite element models of direct soil burial, submarine, cable trench, and transition section are established; Based on the initial finite element model, the cross-section of the submarine cable is meshed, and a finite element simulation model after meshing is established. The temperature of the submarine cable is obtained by performing multiphysics coupling calculations on the meshed finite element simulation model, and the cable core is then simulated based on the temperature of the submarine cable. The simulation results of the submarine cable core temperature are compared with the temperature measured by the fiber optic temperature measuring device built into the submarine cable to obtain the error between the simulation and the actual temperature. Determine whether the error between the simulation and the actual situation is within the set range. If it is, obtain the temperature, magnetic field and fluid velocity field distribution of the submarine cable.

[0007] As a further improvement of the present invention, the initial finite element model of the direct burial in soil, the seabed, the cable trench, and the transition section based on the submarine cable structure includes: Based on the submarine cable structure, obtain the parameters of several layers of the submarine cable structure; Based on the parameters of several layers of the submarine cable structure, a geometric model of the submarine cable is established. Based on the geometric model of the submarine cable, and according to the material and physical parameters of several layers of the submarine cable structure, initial finite element models of direct burial in soil, submarine, cable trench and transition section are established.

[0008] As a further improvement of the present invention, the step of meshing the submarine cable cross-section according to the initial finite element model and establishing a meshed finite element simulation model includes: Based on the initial finite element model, and according to the accuracy requirements of multiphysics coupling calculation, the cross-section of the submarine cable is divided into free triangular meshes, and a finite element simulation model after mesh division is established.

[0009] As a further improvement of the present invention, the step of performing multiphysics coupling calculations on the finite element simulation model after mesh partitioning to obtain the temperature of the submarine cable, and performing simulation calculations of the cable core based on the temperature of the submarine cable, includes: The temperature distribution field of the submarine cable body and its surrounding environment under steady-state conditions was obtained using the meshed finite element simulation model. The distribution of key physical quantities in the magnetic field and fluid velocity field; Based on temperature distribution field The distribution of key physical quantities such as magnetic field and fluid velocity field is analyzed, and multi-physics coupling calculations are performed to obtain the temperature of the submarine cable. Based on the temperature of the submarine cable, simulation calculations are performed on the cable core to obtain the simulation results of the cable core.

[0010] As a further improvement of the present invention, the step of comparing the core temperature of the submarine cable in the simulation calculation results with the temperature measured by the fiber optic temperature measuring device built into the submarine cable to obtain the error between the simulation and the actual temperature includes: The temperature of the submarine cable core in the simulation calculation results The measured temperature of the wire core under the same location and working conditions in actual engineering projects is consistent with the actual measured temperature value of the wire core. Compare; Calculate the relative error between the two. .

[0011] As a further improvement of the present invention, the step of determining whether the error between the simulation and the actual situation is within a set range, and if so, obtaining the temperature, magnetic field, and fluid velocity field distribution of the submarine cable, includes: Determine whether the error between the simulation and the actual situation is within the set range. If it is, then use the finite element simulation model after meshing to perform multiphysics coupling calculations to obtain the temperature, magnetic field and fluid velocity field distribution of the submarine cable. If not, readjust the environmental parameters and boundary conditions, and re-run the simulation until the error between the simulation results and the actual results is within the set range.

[0012] Secondly, the present invention provides a multi-parameter multiphysics simulation calculation system for high-voltage submarine cables, comprising: Initial Model Module: Used to create initial finite element models of direct burial in soil, seabed, cable trench, and transition section based on the submarine cable structure; Simulation model module: Used to mesh the submarine cable cross-section based on the initial finite element model and establish a meshed finite element simulation model; Core temperature module: Used to perform multiphysics coupling calculations on the meshed finite element simulation model to obtain the temperature of the submarine cable, and to perform simulation calculations on the core of the submarine cable based on the temperature of the submarine cable. Error calculation module: This module compares the temperature of the submarine cable core in the simulation calculation results with the temperature measured by the fiber optic temperature measuring device built into the submarine cable to obtain the error between the simulation and the actual temperature. Error comparison module: used to determine whether the error between simulation and reality is within the set range. If it is, the temperature, magnetic field and fluid velocity field distribution of the submarine cable are obtained.

[0013] Thirdly, the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the multi-parameter multiphysics simulation calculation method for high-voltage submarine cables.

[0014] Fourthly, the present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the multi-parameter multiphysics simulation calculation method for high-voltage submarine cables as described in any one of claims 1-6.

[0015] Fifthly, the present invention provides a computer program product, characterized in that it includes computer instructions, which, when executed by a processor, implement the steps of the multi-parameter multiphysics simulation calculation method for high-voltage submarine cables.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The multi-parameter, multi-physics simulation method for high-voltage submarine cables provided by this invention breaks through the limitations of existing technologies that are limited to simulation of a single laying condition. By establishing an initial finite element model covering direct burial in soil, submarine, cable trench, and transition section and performing mesh generation, multi-physics coupled calculation is achieved. This method can not only accurately simulate the temperature of submarine cables under different laying conditions, but also simultaneously observe the distribution of temperature field, magnetic field, and fluid velocity field around the cable, as well as the temperature changes in the laying transition section. Furthermore, the accuracy of the simulation is verified by comparing it with the actual temperature measured by an optical fiber temperature measuring device, ensuring the reliability of the obtained submarine cable temperature and other data. This provides strong support for the safe operation and scientific design of submarine cables. Attached Figure Description

[0017] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. In the drawings: Figure 1 This is a flowchart illustrating a multi-parameter, multi-physics simulation calculation method for high-voltage submarine cables according to the present invention. Figure 2 This is a flowchart illustrating the multi-parameter, multi-physics simulation calculation method for high-voltage submarine cables according to the present invention. Figure 3 This is a cross-sectional schematic diagram of the submarine cable model of the present invention; Figure 4 This is a schematic diagram illustrating the main laying conditions of the submarine cable of the present invention; Figure 5 This is a schematic diagram illustrating the laying process under the direct burial method in soil according to the present invention; Figure 6 This is a schematic diagram of the finite element model for direct burial in soil according to the present invention; Figure 7 This is a schematic diagram illustrating the laying process under submarine conditions according to the present invention; Figure 8 This is a schematic diagram of the finite element model for the submarine laying scenario of the present invention; Figure 9 This is a schematic diagram illustrating the cable trench laying method according to the present invention. Figure 10 This is a schematic diagram of the finite element model for cable trench laying according to the present invention; Figure 11 This is a temperature field distribution diagram from a simulation result of an embodiment of the present invention; Figure 12 This is a magnetic field distribution diagram from a simulation result of an embodiment of the present invention; Figure 13 This is a fluid velocity field distribution diagram from a simulation result of an embodiment of the present invention; Figure 14 This is a schematic diagram of the transition section between submarine laying and direct burial in soil according to the present invention; Figure 15 This is a schematic diagram of the transition section between direct burial in soil and cable trench laying according to the present invention; Figure 16 This is a schematic diagram of the structure of a multi-parameter multiphysics simulation calculation system for high-voltage submarine cables according to the present invention; Figure 17 This is a schematic diagram of an electronic device in an embodiment of the present invention.

[0018] In the diagram, 1 is the conductor core; 2 is the conductor shielding layer; 3 is the insulation layer; 4 is the insulation shielding layer; 5 is the buffer layer; 6 is the metal sheath; 7 is the inner lining layer; 8 is the metal armor layer; 9 is the outer sheath layer; 11 is seawater; 12 is the submarine cable; 13 is soil; 21 is air; 22 is the cable trench body; 23 is the submarine cable; and 24 is soil. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] To address the problem that existing simulation technologies are limited to a single laying condition and struggle to accurately simulate the temperature of submarine cables under varying laying conditions, this invention provides a multi-parameter, multi-physics simulation method for high-voltage submarine cables. Figure 1 As shown, the method includes: S100: Based on the submarine cable structure, establish the initial finite element model of direct burial in soil, submarine, cable trench and transition section; S200: Based on the initial finite element model, mesh the cross-section of the submarine cable and establish a meshed finite element simulation model; S300: Through the finite element simulation model after meshing, multiphysics coupling calculation is performed to obtain the temperature of the submarine cable, and the simulation calculation of the cable core is performed based on the temperature of the submarine cable. S400: Compare the core temperature of the submarine cable in the simulation calculation results with the temperature measured by the fiber optic temperature measuring device built into the submarine cable to obtain the error between the simulation and the actual temperature. S500: Determines whether the error between the simulation and the actual situation is within the set range. If it is, it obtains the temperature, magnetic field and fluid velocity field distribution of the submarine cable.

[0022] This method can simultaneously observe the distribution of temperature field, magnetic field and fluid velocity field around the cable and the temperature change in the laying transition section, and obtain the temperature when the laying conditions of the submarine cable change.

[0023] The present invention will be further explained and described below with reference to the accompanying drawings.

[0024] like Figure 2 As shown, the finite element modeling and multiphysics simulation method for high-voltage submarine cables provided by this invention includes the following steps: S1: Based on the actual structure of high-voltage submarine cables, an initial finite element simulation model of the submarine cable is constructed for the transition section of the three laying methods: direct burial in soil, submarine, and cable trench.

[0025] Specifically, based on the actual design parameters of the high-voltage AC submarine cable and the physical parameters of the structural materials of each layer, an initial finite element simulation model of the submarine cable is established in a multiphysics coupling simulation software.

[0026] Submarine cable structure such as Figure 3As shown, the submarine cable is parametrically modeled using simulation software. The model includes conductor 1, conductor shielding layer 2, insulation layer 3, insulation shielding layer 4, buffer layer 5, metal sheath 6, inner lining layer 7, metal armor layer 8, and outer sheath 9.

[0027] S2: Based on the initial finite element simulation model established in S1, the simulation parameters of the initial finite element simulation model are set according to the material and physical parameters of each layer of the submarine cable structure, and the finite element model is established.

[0028] Specifically, the materials used in submarine cables include copper, semi-conductive materials, cross-linked polyethylene (XLPE), lead alloys, polyethylene, polypropylene, asphalt, etc. The material parameters of submarine cables include physical parameters such as thermal conductivity, constant pressure heat capacity, density, relative magnetic permeability, relative permittivity, and electrical conductivity.

[0029] S3: Set constraint conditions for the solid heat transfer module, magnetic field module, and turbulence module in the finite element model established in S2. Set the temperature boundary conditions of the model boundary in the solid heat transfer module, set the current magnitude of the cable core conductor in the magnetic field module, add current excitation to the conductor, and set the fluid flow and boundary conditions in the air or seawater region in the turbulence model.

[0030] Specifically, the boundary conditions of the temperature field are divided into three types: First type of boundary condition: The boundary location and temperature are known and are constant. (1) Second type of boundary condition: Normal heat flux density at known boundary location: (2) Third type of boundary condition: The fluid temperature at the boundary and the convective heat transfer coefficient between the object surface and the fluid are known. (3) In the formula, The convective heat transfer coefficient of the object surface; The surface temperature of the object; The ambient temperature surrounding the object.

[0031] When submarine cables are laid in shallow waters, trenches are typically created using plow-type and flush-laying methods, and the cables are then buried within them. When laid in deep waters, subsea laying is generally employed, requiring underwater robots for monitoring and continuous adjustment of the laying vessel's speed, direction, and cable laying rate. Trench laying is typically used for sections crossing seawalls and on land. Based on these three boundary conditions, adjustments are made according to the actual conditions of each. A schematic diagram of the main submarine cable laying methods is shown below. Figure 4 As shown; In the case of direct burial in the soil, the cable is buried directly in the soil, 1.5m from the upper soil boundary. The upper soil boundary exchanges heat with the outside environment via convection. The left, right, and lower boundaries of the cable are 5m away from the cable. The temperature gradient at the left and right boundaries is 0. Since the lower soil boundary is almost unaffected by the cable's heating, it is set to a fixed temperature. Heat transfer in the soil is by conduction. The entire simulation area consists of the soil and the cable. A schematic diagram of the laying configuration is shown below. Figure 5 As shown, the laying method topology diagram is as follows: Figure 6 As shown.

[0032] In the subsea laying scenario, the cable is placed on the seabed, with the soil layer 5m below the seawater boundary. The cable is surrounded by seawater, and heat transfer in the seawater is convective. The soil depth is 5m, and the deep soil layer is set to a fixed temperature. The cable is 5m from the left and right boundaries, which are respectively set as inflow and outflow points in the seawater, allowing temperature transfer at the boundaries. The temperature gradient between the left and right boundaries in the soil is set to 0, and heat transfer in the soil is conducted. The entire simulation area simultaneously includes seawater, soil, and the cable. A schematic diagram of the laying scenario is shown below. Figure 7 As shown, the laying method topology diagram is as follows: Figure 8 As shown.

[0033] In the cable trench laying scenario, the cable is placed at the bottom of a square cable trench, directly contacting the air within the trench. Heat is transferred through convection in the air. The outer wall of the cable trench is 1.5m wide, and the inner wall is 1m wide. The cable is 5m from both the left and right boundaries. The lower outer wall of the cable trench is 5m from the lower boundary of the soil. The upper boundary exchanges heat with the outside environment via convection. The deep soil is set to a fixed temperature, with a temperature gradient of 0 at the left and right boundaries. Heat transfer in the soil is by conduction. The entire simulation area consists of the cable trench body, soil, air within the cable trench, and the cable. A schematic diagram of the laying scenario is shown below. Figure 9 As shown, the laying method topology diagram is as follows: Figure 10 As shown. Solving for the temperature, magnetic field, and velocity distribution maps of the submarine cable can be obtained, as shown in the figure. Figures 11-13 As shown.

[0034] For transition sections in submarine cable laying, where two or more laying methods exist simultaneously, two-dimensional simulation models cannot meet the simulation requirements; therefore, three-dimensional models are used for analysis. Based on the actual conditions of cable laying transition sections, submarine cables may transition between submarine laying and direct burial in soil, or between direct burial in soil and cable trench laying. Both types of models are simultaneously established in the three-dimensional model. In the case of transition between submarine laying and direct burial in soil, the three-dimensional model includes soil, seawater, and cable components, as illustrated in the diagram below. Figure 14 As shown, in the transition from direct burial in soil to cable trench laying, the 3D model includes the soil, the cable trench body, the air in the cable trench, and the air outside the trench, as illustrated in the diagram. Figure 15 As shown.

[0035] S4: Set up two types of multiphysics fields, namely non-isothermal flow and electromagnetic heat, according to the coupling of the physical fields. Specifically, based on the boundary conditions set by S3, a multiphysics coupling mechanism is established in the initial finite element model: for the submarine laying and cable trench laying models containing fluid regions, the "non-isothermal flow" coupling interface is activated to simultaneously solve the turbulent fluid heat transfer and solid heat transfer problems, characterizing the convective heat transfer effect of seawater / air flow on cable heat dissipation and the influence of cable heat generation on the surrounding fluid flow; for all laying models, the Joule loss of the conductor core calculated by the magnetic field module (generated by current excitation) is automatically mapped to the heat source of the solid heat transfer module, while considering the feedback effect of the material electromagnetic parameters (conductivity, permeability) changing with temperature, to achieve bidirectional coupling of electromagnetic and thermal fields.

[0036] S5: Based on the simulation model of S4, select the corresponding mesh size according to the size of each part, perform free triangular meshing on the cross section of the submarine cable, and establish the finite element simulation model after meshing. Specifically, based on the simulation model established by S4, and considering the significant scale differences between the various thin-layer structures of the cable, such as the conductor shielding layer and the insulation layer, and the large-scale external environment, fine and coarse mesh sizes are set in the finite element software respectively. Free triangular meshing is performed on the cross-section of the submarine cable and the surrounding environment. Special attention is paid to the mesh refinement of the multi-layer interfaces and fluid boundary layers inside the cable to capture key physical field gradients, and to ensure that the mesh quality meets the accuracy requirements of multi-physics coupling calculation. Finally, the meshed finite element simulation model is established.

[0037] S6: Based on the simulation model of S5, multi-physics coupling calculations are performed to obtain the temperature, magnetic field and fluid velocity field distribution of the submarine cable under specific ambient temperature and current magnitude. Specifically, based on the finite element simulation model after S5 mesh generation, a multiphysics coupled solver is started in the simulation software, employing robust numerical methods (such as fully coupled or decoupled solution strategies) under a set specific ambient temperature. and specific conductor current Under these conditions, the solid heat transfer, magnetic field (AC / DC), and turbulence equations are solved simultaneously, fully considering electromagnetic thermal coupling and non-isothermal flow coupling effects. Through iterative calculations until the preset convergence tolerance is met, the temperature distribution field of the submarine cable body and its surrounding environment under steady-state conditions is finally obtained stably and accurately. The distribution of key physical quantities such as magnetic field distribution and fluid velocity field.

[0038] S7: Based on the simulation results of step S6, compare the temperature of the submarine cable core with the temperature measured by the fiber optic temperature measuring device built into the submarine cable to obtain the error between the simulation and the actual temperature. Specifically, based on the simulation results of the conductor temperature distribution at a specific axial position of the submarine cable corresponding to the optical fiber temperature measurement point under steady-state conditions calculated by S6, the average or highest temperature value of the conductor cross-section at that position is extracted. The measured core temperature was compared with that obtained by the distributed optical fiber temperature measurement system (DTS) built into the submarine cable under the same location and working conditions (i.e., the same ambient temperature and conductor current) in the actual project. Make a direct comparison; Calculate the relative error between the two. This is used to quantitatively evaluate the accuracy of the simulation model's predictions, and the error value is recorded as a basis for subsequent model verification or correction.

[0039] S8: Based on the comparison results of S7, if the error is within 3%, then the temperature distribution result obtained in step S6 is the desired result; Based on the comparison results in S7, if the error is outside 3%, then in step S5, the environmental parameters and boundary conditions are reset, and the multiphysics coupling calculation is performed again. Steps S6 to S8 are repeated until the error is within 3% to obtain accurate temperature, magnetic field and fluid flow field distribution.

[0040] In summary, this method establishes a geometric model of the high-voltage submarine cable, sets material parameters for each structure, and establishes constraints for the temperature, magnetic, and flow fields. After multi-physics coupling, coupled calculations are performed. The simulated conductor temperature is compared with the temperature measured by the temperature-sensing optical fiber integrated into the submarine cable. If the error is less than 3%, the simulation result is considered accurate. The simulation model established in this invention accurately simulates the submarine cable structure and surrounding environment under three laying methods: direct burial in soil, submarine, and cable trench. Combined with 3D simulation, modeling and simulation analysis of each laying transition section are performed. Compared to traditional temperature measurement methods, this method is more accurate, allowing simultaneous observation of the distribution of temperature, magnetic, and fluid velocity fields around the cable, as well as temperature changes in the laying transition section. This helps research and maintenance personnel predict cable operation conditions in advance based on load distribution, improving cable operation safety.

[0041] The second objective of this invention is to propose a multi-parameter, multi-physics simulation calculation system for high-voltage submarine cables, such as... Figure 16 As shown, it includes: Initial Model Module 100: Used to establish initial finite element models of direct soil burial, seabed, cable trench and transition section based on the submarine cable structure; Simulation Model Module 200: Used to mesh the submarine cable cross-section based on the initial finite element model and establish a meshed finite element simulation model; Cable core temperature module 300: Used to perform multi-physics field coupling calculations on the finite element simulation model after meshing to obtain the temperature of the submarine cable, and to perform simulation calculations on the cable core of the submarine cable based on the temperature of the submarine cable. Error calculation module 400: It is used to compare the temperature of the submarine cable core in the simulation calculation results with the temperature measured by the fiber optic temperature measuring device built into the submarine cable to obtain the error between the simulation and the actual temperature. Error Comparison Module 500: Used to determine whether the error between the simulation and the actual situation is within the set range. If it is, the temperature, magnetic field and fluid velocity field distribution of the submarine cable are obtained.

[0042] like Figure 17 As shown, a third objective of this invention is to provide an electronic device comprising a processor 601, a memory 602, and a display screen 603. The memory 602 and the display screen 603 are both connected to the processor 601, such as via a bus 604. Optionally, the electronic device may further include a transceiver 605. It should be noted that in practical applications, the transceiver 605 is not limited to one type, and the structure of this electronic device does not constitute a limitation on the embodiments of this application.

[0043] Processor 601 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this application. Processor 601 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0044] Bus 604 may include a pathway for transmitting information between the aforementioned components. Bus 604 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 604 can be divided into address bus, data bus, control bus, etc.

[0045] The memory 602 may be a ROM (Read Only Memory) or other type of static storage device capable of storing static information and instructions, RAM (Random Access Memory) or other type of dynamic storage device capable of storing information and instructions, or an EEPROM (Electrically Erasable Programmable Read Only Memory), CD-ROM (Compact Disc Read Only Memory) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto.

[0046] The memory 602 is used to store application code that executes the solution of this application, and its execution is controlled by the processor 601. The processor 601 is used to execute the application code stored in the memory 602 to implement the content shown in the foregoing method embodiments.

[0047] Figure 17 The electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of this application.

[0048] A fourth objective of this invention is to provide a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, performs the aforementioned functions. Figure 1 The illustrated method embodiments include various processes. For example, a memory may include instructions that can be executed by a processor of an electronic device to perform the described method.

[0049] A computer-readable storage medium can be a tangible device that holds and stores instructions used by an instruction execution device. A computer-readable storage medium can be, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination thereof. Specifically, a computer-readable storage medium can be a portable computer disk, a hard disk, a USB flash drive, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), staging random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory stick, floppy disk, optical disk, magnetic disk, mechanical encoding device, or any combination thereof.

[0050] A fifth objective of this invention is to provide a computer program product comprising computer instructions that, when executed by a processor, implement the above-described... Figure 1 The various processes of the method embodiments shown can achieve the same technical effect, and will not be described again here to avoid repetition.

[0051] Many embodiments and applications beyond the examples provided will be apparent to those skilled in the art upon reading the foregoing description. Therefore, the scope of this teaching should not be determined by reference to the foregoing description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

[0052] The above content provides a further detailed description of the present invention. It should not be construed that the specific embodiments of the present invention are limited to this. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection of the present invention as defined by the submitted claims.

Claims

1. A multi-parameter, multi-physics simulation calculation method for high-voltage submarine cables, characterized in that, include: Based on the submarine cable structure, initial finite element models of direct soil burial, submarine, cable trench, and transition section are established; Based on the initial finite element model, the cross-section of the submarine cable is meshed, and a finite element simulation model after meshing is established. The temperature of the submarine cable is obtained by performing multiphysics coupling calculations on the meshed finite element simulation model, and the cable core is then simulated based on the temperature of the submarine cable. The simulation results of the submarine cable core temperature are compared with the temperature measured by the fiber optic temperature measuring device built into the submarine cable to obtain the error between the simulation and the actual temperature. Determine whether the error between the simulation and the actual situation is within the set range. If it is, obtain the temperature, magnetic field and fluid velocity field distribution of the submarine cable.

2. The multi-parameter multiphysics simulation calculation method for high-voltage submarine cables according to claim 1, characterized in that, The initial finite element model of the submarine cable structure, including direct burial in soil, submarine, cable trench, and transition section, is established based on the submarine cable structure, including: Based on the submarine cable structure, obtain the parameters of several layers of the submarine cable structure; Based on the parameters of several layers of the submarine cable structure, a geometric model of the submarine cable is established. Based on the geometric model of the submarine cable, and according to the material and physical parameters of several layers of the submarine cable structure, initial finite element models of direct burial in soil, submarine, cable trench and transition section are established.

3. The multi-parameter multiphysics simulation calculation method for high-voltage submarine cables according to claim 1, characterized in that, The process of meshing the submarine cable cross-section based on the initial finite element model and establishing a meshed finite element simulation model includes: Based on the initial finite element model, and according to the accuracy requirements of multiphysics coupling calculation, the cross-section of the submarine cable is divided into free triangular meshes, and a finite element simulation model after mesh division is established.

4. The multi-parameter multiphysics simulation calculation method for high-voltage submarine cables according to claim 1, characterized in that, The finite element simulation model after mesh generation is used to perform multiphysics coupling calculations to obtain the temperature of the submarine cable. Based on this temperature, simulation calculations are then performed on the cable core, including: The temperature distribution field of the submarine cable body and its surrounding environment under steady-state conditions was obtained using the meshed finite element simulation model. The distribution of key physical quantities in the magnetic field and fluid velocity field; Based on temperature distribution field The distribution of key physical quantities such as magnetic field and fluid velocity field is analyzed, and multi-physics coupling calculations are performed to obtain the temperature of the submarine cable. Based on the temperature of the submarine cable, simulation calculations are performed on the cable core to obtain the simulation results of the cable core.

5. The multi-parameter multiphysics simulation calculation method for high-voltage submarine cables according to claim 1, characterized in that, The process of comparing the simulated cable core temperature with the temperature measured by the fiber optic temperature measuring device built into the cable to obtain the error between the simulation and the actual temperature includes: The temperature of the submarine cable core in the simulation calculation results The measured temperature of the wire core under the same location and working conditions in actual engineering projects is consistent with the actual measured temperature value of the wire core. Compare; Calculate the relative error between the two. .

6. The multi-parameter multiphysics simulation calculation method for high-voltage submarine cables according to claim 1, characterized in that, The step of determining whether the error between the simulation and the actual situation is within a set range, and if so, obtaining the temperature, magnetic field, and fluid velocity field distribution of the submarine cable, including: Determine whether the error between the simulation and the actual situation is within the set range. If it is, then use the finite element simulation model after meshing to perform multiphysics coupling calculations to obtain the temperature, magnetic field and fluid velocity field distribution of the submarine cable. If not, readjust the environmental parameters and boundary conditions, and re-run the simulation until the error between the simulation results and the actual results is within the set range.

7. A multi-parameter multiphysics simulation calculation system for high-voltage submarine cables, characterized in that, include: Initial Model Module: Used to create initial finite element models of direct burial in soil, seabed, cable trench, and transition section based on the submarine cable structure; Simulation model module: Used to mesh the submarine cable cross-section based on the initial finite element model and establish a meshed finite element simulation model; Core temperature module: Used to perform multiphysics coupling calculations on the meshed finite element simulation model to obtain the temperature of the submarine cable, and to perform simulation calculations on the core of the submarine cable based on the temperature of the submarine cable. Error calculation module: This module compares the temperature of the submarine cable core in the simulation calculation results with the temperature measured by the fiber optic temperature measuring device built into the submarine cable to obtain the error between the simulation and the actual temperature. Error comparison module: used to determine whether the error between simulation and reality is within the set range. If it is, the temperature, magnetic field and fluid velocity field distribution of the submarine cable are obtained.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the multi-parameter multiphysics simulation calculation method for high-voltage submarine cables as described in any one of claims 1-6.

9. A computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the multi-parameter multiphysics simulation calculation method for high-voltage submarine cables according to any one of claims 1-6.

10. A computer program product, characterized in that, It includes computer instructions that, when executed by a processor, implement the steps of a multi-parameter multiphysics simulation calculation method for high-voltage submarine cables as described in any one of claims 1-6.

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