Offshore flexible direct current conversion platform multi-physics field calculation method and related device

Abstract

The invention discloses a multi-physics field calculation method for an offshore flexible direct current conversion platform and a related device, and relates to the technical field of high-voltage direct current transmission. The converter platform is divided into a valve hall, an alternating-current field hall, a direct-current field hall and a GIS equipment room according to functions, three-level calculation levels of equipment, a cabin and a platform are set, equipment-level, cabin-level and platform-level multi-physical field simulation is carried out in sequence, the simulation result of the previous level serves as the excitation condition of the next level, step-by-step geometric simplified modeling is combined, and the simulation result of the next level serves as the excitation condition of the next level. And cross-scale electricity-magnetism-heat-force multi-physics field coupling analysis is realized. The problems that in the prior art, due to the fact that the model scale is too large, full-platform simulation is not feasible, and key coupling variables are difficult to identify are solved, the simulation efficiency and precision are remarkably improved, and multi-physics field equilibrium optimization design in a compact space is supported.

Description

Technical Field

[0001] This invention relates to the field of high voltage direct current transmission technology, specifically to a multiphysics calculation method and related apparatus for a marine flexible DC converter platform. Background Technology

[0002] As a core facility for power conversion, the offshore flexible DC transmission converter platform integrates a large number of high-voltage, high-power electrical devices, such as valve towers, connecting transformers, bridge arm reactors, and gas-insulated switchgear. These devices, operating within a compact cabin space, generate complex multi-physical fields, including electric, magnetic, temperature, and structural stress fields. These fields are interconnected and mutually influential, and their distribution characteristics and evolution patterns directly affect the insulation safety, heat dissipation efficiency, mechanical strength, and overall reliability and economy of the platform.

[0003] Currently, simulation analysis of such complex systems often employs simulation tools that use a single physical field or a limited number of coupled physical fields. However, existing technologies have the following limitations: (1) The simulation tools are functionally fragmented, making it difficult to achieve unified modeling and collaborative calculation of multiple physical fields such as electricity, magnetism, heat, and force; (2) Due to the complex structure, numerous devices, and large scale span of offshore converter platforms, directly performing detailed modeling of the entire platform requires a huge amount of computation, making it almost impossible to solve, which makes it difficult to identify key coupling factors; (3) There is a lack of a method for overall hierarchical mapping and simplification from equipment and compartments to the platform, making it impossible to achieve efficient simulation while ensuring computational accuracy, thus making it difficult to perform balanced optimization design of the distribution of multiple physical fields in a compact space. Summary of the Invention

[0004] The purpose of this invention is to provide a multiphysics calculation method and related device for offshore flexible DC converter platforms. This method can efficiently and accurately obtain the electromagnetic-thermal-mechanical multiphysics distribution characteristics from the equipment level, compartment level to the platform level by reasonably dividing the converter platform into regions and levels and adopting a bottom-up, step-by-step mapping and simplification simulation strategy, thereby providing a scientific basis for the overall optimization design of the platform.

[0005] To achieve the above objectives, the present invention provides the following solutions: In a first aspect, the present invention provides a multiphysics calculation method for a marine flexible DC converter platform, comprising the following steps: Step S1: Divide the converter platform into regions and levels; The area division includes: dividing the converter platform into valve hall, AC field hall, DC field hall and GIS equipment room according to the functions of the platform compartments; The hierarchical division includes three computing levels: setting equipment, compartments, and platforms; Step S2: Perform equipment-level multiphysics simulation on each main electrical device to obtain the multiphysics distribution characteristics of each main electrical device; Step S3: Based on the multiphysics distribution characteristics of each of the main electrical equipment, perform multiphysics simulation at the compartment level for each compartment to obtain the multiphysics distribution characteristics of each compartment; Step S4: Based on the multiphysics distribution characteristics of each of the compartments, perform platform-level multiphysics simulation on the entire converter platform to obtain the multiphysics distribution characteristics of the converter platform.

[0006] Furthermore, the specific process of performing equipment-level multiphysics simulation on any of the main electrical equipment in step S2 is as follows: Establish a first simplified 3D model; Define material properties, apply excitation conditions, and determine multiphysics coupling relationships for the first simplified 3D model; The first simplified three-dimensional model is meshed and calculated to obtain the multiphysics distribution characteristics of each of the main electrical equipment.

[0007] Furthermore, establishing the first simplified 3D model specifically includes: Based on the 3D model provided by the main electrical equipment manufacturer, geometric features whose impact on the multiphysics calculation results does not exceed a preset threshold are removed, and the main features are retained to obtain a simplified 3D model of the main electrical equipment.

[0008] Furthermore, the specific process of performing cabin-level multiphysics simulation for any of the aforementioned cabins in step S3 is as follows: A second simplified 3D model is established, which includes: a secondary equipment model, a cabin deck model, and a cabin wall model obtained by further simplifying the geometric features based on the first simplified 3D model. Excitation conditions are applied to the secondary model of the equipment based on the multiphysics distribution characteristics of each of the main electrical devices, and material properties are defined and multiphysics coupling relationships are determined for the second simplified three-dimensional model. The second simplified three-dimensional model is meshed and calculated to obtain the multiphysics distribution characteristics of each compartment.

[0009] Furthermore, the specific process of step S4 is as follows: A third simplified three-dimensional model is established, which includes: a secondary model of the compartment obtained by further simplifying the geometric features based on the second simplified three-dimensional model, an outer shell model of the converter platform, and a basic support model of the converter platform; Excitation conditions are applied to the secondary model of each compartment based on the multiphysics distribution characteristics of each compartment, and material properties are defined and multiphysics coupling relationships are determined for the third simplified three-dimensional model as a whole. The third simplified three-dimensional model is meshed and calculated to obtain the multiphysics distribution characteristics of the converter platform.

[0010] Furthermore, in step S1, the main electrical equipment in the valve hall includes a valve tower, a water cooling system, a high-voltage bushing, an equalizing ring, a valve tower surge arrester, a post insulator, and a wall bushing. The main electrical equipment in the AC hall includes connecting transformers, wall bushings, busbars, surge arresters, and AC disconnect switches; The main electrical equipment in the DC field hall includes bridge arm reactors, wall bushings, busbars, surge arresters, and DC disconnect switches.

[0011] Furthermore, the multiphysics field includes electric field, magnetic field, temperature field, and structural stress field.

[0012] Secondly, the present invention provides a multiphysics calculation system for a marine flexible DC converter platform, used to implement the above-mentioned method, including: The partitioning module is used to partition the converter platform into regions and levels; wherein, the region partitioning includes: dividing the converter platform into valve hall, AC field hall, DC field hall and GIS equipment room according to the functions of the platform compartments; The hierarchical division includes three computing levels: setting equipment, compartments, and platforms; The equipment-level simulation module is used to perform equipment-level multiphysics simulation on each main electrical device to obtain the multiphysics distribution characteristics of each main electrical device. The compartment-level simulation module is used to perform compartment-level multiphysics simulation on each of the compartments based on the multiphysics distribution characteristics of each of the electrical main equipment output by the equipment-level simulation module, so as to obtain the multiphysics distribution characteristics of each of the compartments. The platform-level simulation module is used to perform platform-level multiphysics simulation on the entire converter platform based on the multiphysics distribution characteristics of each of the compartments output by the compartment-level simulation module, so as to obtain the multiphysics distribution characteristics of the converter platform.

[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 multiphysics calculation method for a marine flexible DC converter platform as described in the first aspect.

[0014] Fourthly, the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the multiphysics calculation method for a marine flexible DC converter platform as described in the first aspect.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: This invention provides a multiphysics calculation method for offshore flexible DC converter platforms. By constructing a three-level progressive modeling and simulation architecture of equipment, compartments, and platform, and combining regional functional division and a step-by-step geometric order reduction strategy, it achieves cross-scale multiphysics coupling analysis from microscopic equipment details to macroscopic platform response. Because the method clearly defines physical isolation units such as valve halls, AC field halls, DC field halls, and GIS equipment rooms through regional division, and sets three calculation levels (equipment, compartments, and platform), with the simulation results of each level serving as the excitation input for the next level, it avoids the computational resource explosion and non-convergence problems caused by direct modeling of the entire platform. Therefore, it significantly improves the prediction accuracy and computational efficiency of the distribution characteristics and evolution laws of electro-magnetic-thermal-mechanical multiphysics in a high-power-density compact space, providing engineering-applicable technical support for the collaborative optimization design of offshore flexible DC converter platforms. Attached Figure Description

[0016] Figure 1 This is a flowchart illustrating the multiphysics calculation method for a marine flexible DC converter platform in this embodiment of the invention. Figure 1 .

[0017] Figure 2 This is a schematic flowchart illustrating the multiphysics calculation method for a marine flexible DC converter platform in an embodiment of the present invention. Figure 2 .

[0018] Figure 3 This is a schematic diagram of the converter platform hierarchy in an embodiment of the present invention. Detailed Implementation

[0019] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0020] See Figures 1 to 3 This invention provides a multiphysics calculation method for a marine flexible DC converter platform, comprising the following steps: Step S1: Divide the converter platform into regions and levels; The area division includes: dividing the converter platform into valve hall, AC field hall, DC field hall and GIS equipment room according to the functions of the platform compartments; The hierarchical division includes three computing levels: setting equipment, compartments, and platforms; Step S2: Perform equipment-level multiphysics simulation on each main electrical device to obtain the multiphysics distribution characteristics of each main electrical device; Step S3: Based on the multiphysics distribution characteristics of each of the main electrical equipment, perform multiphysics simulation at the compartment level for each compartment to obtain the multiphysics distribution characteristics of each compartment; Step S4: Based on the multiphysics distribution characteristics of each of the compartments, perform platform-level multiphysics simulation on the entire converter platform to obtain the multiphysics distribution characteristics of the converter platform.

[0021] In this embodiment, a three-level progressive multiphysics computational framework is constructed, using regional division as physical constraint anchor points and hierarchical division as the computational logic skeleton. Through geometric order reduction modeling and result transfer mechanisms, the simulation scale of the entire platform is reduced by 2-3 orders of magnitude while ensuring that key physical phenomena are not distorted. By using equipment-level output as compartment-level excitation and compartment-level output as platform-level boundary, the propagation path, attenuation law, and feedback effect of electromagnetic-thermal-mechanical fields in cross-scale space are accurately captured. Finally, high-fidelity multiphysics distribution characteristics covering the entire offshore flexible DC converter platform are obtained, solving the core problems in the background technology, such as unclear multiphysics coupling mechanisms, misjudgment of failure modes of key parts, and lack of quantitative basis for compact space optimization design due to computational infeasibility. This provides a verifiable digital analysis basis for platform insulation coordination design, thermal management strategy formulation, lightweight structural layout, and full life cycle reliability assessment.

[0022] In a more specific embodiment provided by the present invention, Step S2, which involves performing equipment-level multiphysics simulation on any electrical main equipment, is as follows: Establish a first simplified 3D model; The first simplified 3D model refers to a geometrically reduced-order model constructed for equipment-level multiphysics simulation while ensuring the accuracy of key physical responses. Its construction basis is the original high-fidelity 3D CAD model (such as SolidWorks, CATIA or NX format) provided by the main electrical equipment manufacturer. Through geometric feature identification and influence assessment, minor geometric details that have an impact on electric field distribution, magnetic field distribution, temperature gradient evolution and structural stress transmission below a preset threshold (±3% field quantity deviation threshold) are eliminated.

[0023] Define material properties, apply excitation conditions, and determine multiphysics coupling relationships for the first simplified 3D model; Defining material properties refers to assigning constitutive parameters of the corresponding physical medium to each geometry in the first simplified 3D model; specifically, these include: electrical conductivity σ (unit: S / m), relative magnetic permeability μ, etc. (dimensionless), specific heat capacity c p (Unit: J / (kg·K)), density ρ (unit: kg / m³), thermal conductivity k (unit: W / (m·K)), Young's modulus E (unit: Pa), Poisson's ratio ν (dimensionless), coefficient of linear expansion α (unit: 1 / K); for nonlinear materials (such as silicon steel sheets, soft magnetic composite materials), the BH curve (magnetization curve) and JE curve (conductivity as a function of temperature) are simultaneously imported; for composite insulating materials (such as epoxy impregnated paper, SF6 gas), equivalent parameters are calculated using the volume fraction weighted average method or the Maxwell-Garnett effective medium theory; the material property database is derived from the appendices of IEC 60076 and IEC 62271 standards and manufacturers' test reports (such as ABB and Siemens equipment material manuals).

[0024] Applying excitation conditions refers to applying source terms that drive the evolution of multiphysics within the boundary of the first simplified 3D model or a specific domain. Specifically, this includes: voltage excitation (e.g., applying a ±320 kV DC bias superimposed with a 10 kHz high-frequency ripple at the valve tower port), current excitation (e.g., injecting a short-circuit current peak of 52 kA into the transformer winding under rated operating conditions), thermal boundary conditions (e.g., inlet water temperature of 45℃, flow velocity of 2.5 m / s, heat transfer coefficient h = 8500 W / (m²·K) for a water-cooled system), and mechanical loads (e.g., a horizontal acceleration load of 0.3 g under the seismic spectral response spectrum, and wind load converted to a uniformly distributed pressure of 1.2 kPa according to the IEC 61400-3 offshore wind turbine load standard). The time-domain form of the excitation conditions supports three modes: steady-state, transient (step time Δt = 10 ns–10 ms adaptive), and harmonic (FFT decomposition to the 50th harmonic). Determining the multiphysics coupling relationship means clarifying the interaction mechanism and data transmission path between the various physics fields.

[0025] The first simplified 3D model is meshed and calculated to obtain the multiphysics distribution characteristics of each main electrical device.

[0026] Mesh generation refers to discretizing the first simplified 3D model to generate a numerical computation mesh adapted to a multiphysics solver. A hybrid mesh strategy is adopted: tetrahedral meshes (minimum element size 0.5–2 mm) are used for high gradient regions (such as electrode tips, winding ends, and narrow sections of cooling channels), while hexahedral structured meshes (element size 5–20 mm) are used for uniform regions (such as the outer shell of the housing and the main body of the support). The overall mesh quality indicators meet the following requirements: Jacobian determinant > 0.3, aspect ratio < 10, orthogonality > 0.5. The number of meshes is determined by convergence analysis—when the mesh density is increased by 20%, the change rate of the electric field at key monitoring points (such as the junction temperature of the valve tower IGBT, the hot spot of the transformer winding, and the stress concentration area of ​​the reactor coil) is < 0.8%, which indicates that the mesh has converged.

[0027] In a more specific embodiment provided by the present invention, establishing the first simplified three-dimensional model specifically includes: Based on the 3D model provided by the main electrical equipment manufacturer, geometric features whose impact on the multiphysics calculation results does not exceed a preset threshold are removed, and the main features are retained to obtain a simplified 3D model of the main electrical equipment.

[0028] In a more specific embodiment provided by the present invention, the specific process of performing cabin-level multiphysics simulation on any of the cabins in step S3 is as follows: A second simplified 3D model is established, which includes: a secondary equipment model, a cabin deck model, and a cabin wall model obtained by further simplifying the geometric features based on the first simplified 3D model. The second simplified 3D model refers to a reduced-order geometric representation model built for the compartment scale. Its core lies in achieving a balance between co-modeling equipment details and compartment structure: on the one hand, this model does not reproduce geometric details such as internal flow channels, heat dissipation fins, and insulator skirts whose impact on the compartment-level field distribution is below a preset threshold (potential distribution deviation ≤3%, surface temperature gradient change rate <0.5K / mm, structural stress amplitude contribution <5%); on the other hand, it retains the equipment shell outline, mounting base, inlet and outlet interfaces, cooling medium inlet and outlet positions, and key shielding structures (such as valve tower metal frames and transformer tank flanges) to accurately convey electromagnetic shielding effects, heat source spatial positioning, and structural load paths. This model can be generated using parametric modeling tools (such as ANSYS SpaceClaim or Siemens NX Direct Modeling) or automatically extracted from the main geometric features through point cloud reverse reconstruction combined with topology optimization algorithms. The secondary equipment model, obtained by further simplifying the geometric features of the first simplified 3D model, specifically refers to directional simplification based on the dominant physical mechanisms of the compartment-level simulation: when the compartment primarily focuses on electromagnetic shielding effectiveness, priority is given to preserving the continuity of the equipment's metal casing and the conductive paths of its joints, while weakening the geometric accuracy of non-conductive components (such as the epoxy resin insulator body); when the compartment primarily focuses on the thermal environment, the equivalence of the radiation / convective heat transfer area on the equipment surface is enhanced, and complex radiator structures are replaced with flat plate arrays with the same surface area and normal emissivity; when the compartment primarily focuses on vibration transmission paths, the geometric fidelity of the equipment base bolt holes, vibration damping pad contact surfaces, and modally sensitive areas of the casing is emphasized. This secondary equipment model and the first simplified model form a hierarchical mapping relationship, sharing the same coordinate system origin and direction reference, and the errors of key dimensions of the secondary equipment model (such as the center distance of mounting holes, interface axis offset, and center of gravity height) are controlled within ±1.5mm to ensure geometric consistency of assembly relationships and boundary condition loading.

[0029] The deck model and cabin wall model of the cabin are engineering representations of a closed metal enclosure structure: the deck model of the cabin adopts a composite plate structure with double steel plates and a middle damping filling layer, and the cabin wall model consists of four vertical steel plates and a top capping plate.

[0030] Excitation conditions are applied to the secondary model of the equipment based on the multiphysics distribution characteristics of each of the main electrical devices, and material properties are defined and multiphysics coupling relationships are determined for the second simplified three-dimensional model. The equipment-level simulation results obtained in step S2 are transformed into the driving source of the cabin-level model. The mapping method varies depending on the type of physical field: electric field excitation uses the potential distribution cloud map of the equipment shell surface as the Dirichlet boundary condition, with a voltage amplitude range of 0–800kV (corresponding to ±800kV flexible DC system), and the time step is sampled at 1 / 1000 of the power frequency period; magnetic field excitation uses the current density vector field of the equipment winding / conductor surface as the Neumann boundary condition or volume current source term, with a maximum current density of 1.2×10 6 A / m² (corresponding to the flow density of the IGBT module in the valve tower); the temperature field excitation uses the heat flux density distribution on the surface of the equipment shell (unit W / m²) or the equivalent heat source power density (unit W / m³), with the peak heat flux density ranging from 500 to 5000 W / m² (corresponding to the surface of the radiator in the water-cooled system); the structural stress field excitation uses the reaction force of the equipment base (including triaxial force and triaxial moment) as a concentrated load applied to the mounting surface node of the secondary model of the equipment. The reaction force amplitude is calculated based on the combination of the equipment's self-weight, electromagnetic force, and thermal expansion force, and the dynamic component is loaded according to the vibration spectrum of offshore platforms specified in IEC 61892-3.

[0031] The material properties defined for the second simplified 3D model cover two categories: structural materials and internal media materials. Structural materials include high-strength marine steel used for the cabin deck and walls; internal media materials include cabin air, air conditioning supply air, and any possible localized insulating oil pools.

[0032] The second simplified 3D model is meshed and calculated to obtain the multiphysics distribution characteristics of each compartment. An adaptive meshing strategy is used for meshing and calculation of the second simplified 3D model: at the interface between the equipment secondary model and the bulkhead, at the edge of deck openings, and in high gradient potential regions (| φ|>10 6 Localized mesh refinement zones are set up (V / m), with mesh size controlled between 0.02 and 0.05 m; a hybrid tetrahedral / hexahedral mesh is used in the central airspace of the cabin, with a maximum element size of 0.3–0.5 m; the overall model node count is controlled at 5 × 10⁻⁶. 5 –2×10 6 The system is designed to ensure that a single solution takes ≤4 hours on mainstream engineering workstations (CPU ≥ 32 cores, RAM ≥ 128GB). The geometric fidelity of the equipment secondary model determines the spatial accuracy of the excitation loading; the structural integrity of the deck model and cabin wall model ensures the physical realism of electromagnetic shielding and thermal boundary conditions; the multi-field mapping mechanism of the excitation conditions enables seamless conversion from equipment-level results to cabin-level inputs; the temperature / frequency dependence definition of material properties supports the constitutive consistency of multi-physics coupling; and the adaptive mesh and solution strategy provide a numerical reliability foundation for the collaborative calculation of all the aforementioned features.

[0033] In a more specific embodiment provided by the present invention, the specific process of step S4 is as follows: A third simplified three-dimensional model is established, which includes: a secondary model of the compartment obtained by further simplifying the geometric features based on the second simplified three-dimensional model, an outer shell model of the converter platform, and a basic support model of the converter platform; The third simplified 3D model is a reduced-order geometric representation for platform-level simulation. The secondary model of the cabin is not a geometric reproduction of the internal equipment of the cabin, but rather an inversion and extraction of the cabin-level multiphysics distribution characteristics (including electric potential distribution cloud map, magnetic flux density vector field, temperature gradient field and structural stress tensor field) obtained in step S3 into equivalent boundary source terms, and a second geometric simplification of the second simplified 3D model is performed accordingly.

[0034] Excitation conditions are applied to the secondary model of each compartment based on the multiphysics distribution characteristics of each compartment, and material properties are defined and multiphysics coupling relationships are determined for the third simplified three-dimensional model as a whole. Applying excitation conditions to the secondary model of the compartment based on the multiphysics distribution characteristics of each compartment refers to: converting the compartment-level simulation results output in step S3 into four types of equivalent excitation sources and mapping them to the corresponding boundaries of the secondary model of the compartment: (i) Electric field excitation—applying the potential distribution on the surface of the valve hall wall as a Dirichlet boundary condition to the outer wall of the secondary model of the compartment, and applying the potential difference at the end of the through-wall bushing in the AC field hall and the DC field hall as a voltage source to the model's inlet and outlet interfaces; (ii) Magnetic field excitation—applying the time series of the Bz component of the region with the largest magnetic flux density amplitude inside each compartment as a Neumann boundary condition to the secondary model of the compartment. The top and bottom plates of the model are used as the top plate, and the leakage magnetic flux density vector at the SF6 gas gap in the GIS equipment room is applied as a surface current source to the inner wall of the model; (iii) Temperature field excitation - the average temperature of the air domain in the compartment, the heat flux density distribution of the equipment heat dissipation surface, and the temperature difference between the inner and outer surfaces of the compartment wall are applied as the third type of boundary conditions (convection heat transfer + radiation + contact conduction composite boundary) to all exposed surfaces of the secondary model of the compartment; (iv) Structural stress excitation - the equivalent stress cloud map at the flange connecting the secondary model of the compartment and the deck is used as the preload boundary condition, and the time history curve of the reaction force of the valve tower foundation support is applied as a dynamic load to the bottom support node of the model. All the above excitation conditions have been normalized to ensure dimensional consistency and numerical stability.

[0035] The third simplified three-dimensional model is meshed and calculated to obtain the multiphysics distribution characteristics of the converter platform.

[0036] Meshing the simplified 3D model involves employing a hybrid meshing strategy: a structured hexahedral mesh (element size h = 15–40 mm) is used for the interface between the secondary cabin model and the outer shell model, the pile-seabed contact surface of the foundation support model, and all opening edges to ensure the accuracy of stress gradient analysis; a tetrahedral mesh (h = 80–120 mm) is used for open areas of the platform (such as the upper surface of the main deck and the jacket cavity) to control the total number of elements; the global mesh satisfies Jacobian ratio > 0.3, aspect ratio < 5, and distortion < 0.9; an adaptive mesh refinement technique can also be used, based on the electric field intensity gradient after the initial solution. E‖, Temperature gradient‖ T‖ and equivalent stress gradient‖ σ e q‖ automatically identifies high gradient regions and triggers local mesh refinement in those regions, with a refinement level not exceeding three.

[0037] In a more specific embodiment provided by the present invention, in step S1, the main electrical equipment in the valve hall includes a valve tower, a water cooling system, a high-voltage bushing, an equalizing ring, a valve tower surge arrester, a post insulator, and a wall bushing. The main electrical equipment in the AC control room includes connecting transformers, wall bushings, busbars, surge arresters, and AC disconnect switches; The main electrical equipment in the DC field hall includes bridge arm reactors, wall bushings, busbars, surge arresters, and DC disconnect switches.

[0038] In a more specific embodiment provided by the present invention, the multiphysics field includes an electric field, a magnetic field, a temperature field, and a structural stress field.

[0039] In another embodiment of the present invention, a multiphysics calculation system for a marine flexible DC converter platform is also provided, comprising: The partitioning module is used to partition the converter platform into regions and levels; wherein, the region partitioning includes: dividing the converter platform into valve hall, AC field hall, DC field hall and GIS equipment room according to the functions of the platform compartments; The hierarchical division includes three computing levels: setting equipment, compartments, and platforms; The equipment-level simulation module is used to perform equipment-level multiphysics simulation on each main electrical device to obtain the multiphysics distribution characteristics of each main electrical device. The compartment-level simulation module is used to perform compartment-level multiphysics simulation on each of the compartments based on the multiphysics distribution characteristics of each of the electrical main equipment output by the equipment-level simulation module, so as to obtain the multiphysics distribution characteristics of each of the compartments. The platform-level simulation module is used to perform platform-level multiphysics simulation on the entire converter platform based on the multiphysics distribution characteristics of each of the compartments output by the compartment-level simulation module, so as to obtain the multiphysics distribution characteristics of the converter platform.

[0040] The present invention also discloses an electronic device, including a memory, a processor, and a computer program stored in the memory and capable of running on the processor. When the processor executes the computer program, it implements the above-mentioned multiphysics calculation method for a marine flexible DC converter platform.

[0041] The present invention also discloses a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described multiphysics calculation method for a marine flexible DC converter platform.

[0042] This invention is described based on flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to specific embodiments. It should be understood that each block of the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing device, generate instructions for implementing the flowcharts and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0043] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0044] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0045] It should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Those skilled in the art can modify the technical solutions described in the above embodiments, or make equivalent substitutions for some of the technical features; and all such modifications and substitutions should fall within the protection scope of the present invention.

Claims

1. A multiphysics calculation method for a marine flexible DC converter platform, characterized in that, Includes the following steps: Step S1: Divide the converter platform into regions and levels; The area division includes: dividing the converter platform into valve hall, AC field hall, DC field hall and GIS equipment room according to the functions of the platform compartments; The hierarchical division includes three computing levels: setting equipment, compartments, and platforms; Step S2: Perform equipment-level multiphysics simulation on each main electrical device to obtain the multiphysics distribution characteristics of each main electrical device; Step S3: Based on the multiphysics distribution characteristics of each of the main electrical equipment, perform multiphysics simulation at the compartment level for each compartment to obtain the multiphysics distribution characteristics of each compartment; Step S4: Based on the multiphysics distribution characteristics of each of the compartments, perform platform-level multiphysics simulation on the entire converter platform to obtain the multiphysics distribution characteristics of the converter platform.

2. The multiphysics calculation method for a marine flexible DC converter platform according to claim 1, characterized in that, The specific process of performing equipment-level multiphysics simulation on any of the electrical main equipment in step S2 is as follows: Establish a first simplified 3D model; Define material properties, apply excitation conditions, and determine multiphysics coupling relationships for the first simplified 3D model; The first simplified three-dimensional model is meshed and calculated to obtain the multiphysics distribution characteristics of each of the main electrical equipment.

3. The multiphysics calculation method for a marine flexible DC converter platform according to claim 2, characterized in that, Establishing the first simplified 3D model specifically includes: Based on the 3D model provided by the main electrical equipment manufacturer, geometric features whose impact on the multiphysics calculation results does not exceed a preset threshold are removed, and the main features are retained to obtain a simplified 3D model of the main electrical equipment.

4. The multiphysics calculation method for a marine flexible DC converter platform according to claim 2, characterized in that, The specific process of performing cabin-level multiphysics simulation for any of the aforementioned cabins in step S3 is as follows: A second simplified 3D model is established, which includes: a secondary equipment model, a cabin deck model, and a cabin wall model obtained by further simplifying the geometric features based on the first simplified 3D model. Excitation conditions are applied to the secondary model of the equipment based on the multiphysics distribution characteristics of each of the main electrical devices, and material properties are defined and multiphysics coupling relationships are determined for the second simplified three-dimensional model. The second simplified three-dimensional model is meshed and calculated to obtain the multiphysics distribution characteristics of each compartment.

5. The multiphysics calculation method for a marine flexible DC converter platform according to claim 4, characterized in that, The specific process of step S4 is as follows: A third simplified three-dimensional model is established, which includes: a secondary model of the compartment obtained by further simplifying the geometric features based on the second simplified three-dimensional model, an outer shell model of the converter platform, and a basic support model of the converter platform; Excitation conditions are applied to the secondary model of each compartment based on the multiphysics distribution characteristics of each compartment, and material properties are defined and multiphysics coupling relationships are determined for the third simplified three-dimensional model as a whole. The third simplified three-dimensional model is meshed and calculated to obtain the multiphysics distribution characteristics of the converter platform.

6. The multiphysics calculation method for a marine flexible DC converter platform according to claim 1, characterized in that, In step S1, the main electrical equipment in the valve hall includes a valve tower, a water cooling system, high-voltage bushings, equalizing rings, valve tower surge arresters, post insulators, and wall bushings. The main electrical equipment in the AC hall includes connecting transformers, wall bushings, busbars, surge arresters, and AC disconnect switches; The main electrical equipment in the DC field hall includes bridge arm reactors, wall bushings, busbars, surge arresters, and DC disconnect switches.

7. The multiphysics calculation method for a marine flexible DC converter platform according to claim 1, characterized in that, The multiphysics field includes electric field, magnetic field, temperature field and structural stress field.

8. A multiphysics calculation system for a marine flexible DC converter platform, characterized in that, include: The partitioning module is used to partition the converter platform into regions and levels; wherein, the region partitioning includes: dividing the converter platform into valve hall, AC field hall, DC field hall and GIS equipment room according to the functions of the platform compartments; The hierarchical division includes three computing levels: setting equipment, compartments, and platforms; The equipment-level simulation module is used to perform equipment-level multiphysics simulation on each main electrical device to obtain the multiphysics distribution characteristics of each main electrical device. The compartment-level simulation module is used to perform compartment-level multiphysics simulation on each of the compartments based on the multiphysics distribution characteristics of each of the electrical main equipment output by the equipment-level simulation module, so as to obtain the multiphysics distribution characteristics of each of the compartments. The platform-level simulation module is used to perform platform-level multiphysics simulation on the entire converter platform based on the multiphysics distribution characteristics of each of the compartments output by the compartment-level simulation module, so as to obtain the multiphysics distribution characteristics of the converter platform.

9. An electronic device 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 a multiphysics calculation method for a marine flexible DC converter platform as described in any one of claims 1 to 8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of a multiphysics calculation method for a marine flexible DC converter platform as described in any one of claims 1 to 8.

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