Modeling simulation method and system for uniform water covering stress of 10kV distribution line conductor

Abstract

The invention discloses a modeling simulation method and system for uniform water covering stress of a 10kV distribution line wire, and relates to the technical field of electric power disaster prevention and reduction, and the method comprises the steps: collecting micrometeorological data of a distribution line region, the micrometeorological data comprising wind speed and temperature; the uniform icing thickness of the wire is collected, and a uniform icing load is calculated; establishing a three-dimensional physical model, and based on the three-dimensional physical model, setting material attribute parameters of a corresponding structure by using simulation software to obtain a simulation model; based on the simulation model, wind speed is set, uniform icing loads with different thicknesses are set on the wire, then grid division and calculation are carried out, finally, stress and deformation states of the wire under the different uniform icing loads are obtained, and a corresponding simulation curve graph is output. According to the method, the SolidWorks and finite element analysis (FEA) methods are utilized, the stress and deformation conditions of the wire and the pole tower under different icing thicknesses can be accurately simulated, and it is ensured that the simulation result has high precision and reliability.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power disaster prevention and reduction, and particularly relates to a modeling and simulation method and system for uniform water-covered stress on conductors of a 10kV distribution line. Background Art

[0002] my country has a vast territory, and most distribution towers are often located in areas with few people and complex terrain. Once a natural disaster such as ice occurs, the conductors may be deformed or even broken. At the very least, this will pose a hidden danger to the safe operation of the power grid, and at worst, it will cause power outages in a large area, causing serious impacts on people's lives.

[0003] With the continuous growth of electricity demand, the safety and stability of distribution lines have become important issues in the design and operation of power systems. 10kV distribution lines are widely used in urban and rural power grids, and their operational reliability directly affects the normal power consumption of users. Winter icing is an important factor affecting the safe operation of distribution lines. Icing not only increases the weight of the conductors, but also changes the mechanical properties of the conductors, resulting in a reduction in the bearing capacity of the conductors and tower structures. In severe cases, it can cause accidents such as line breakage and tower collapse. Studying the stress conditions of the conductors under uniform icing conditions, establishing an accurate mechanical model, and conducting simulation analysis can effectively predict and prevent icing disasters and ensure the safe operation of the power grid.

[0004] Existing research focuses on the impact of ice on the static mechanical properties of conductors, but lacks systematic dynamic simulation analysis. By using advanced modeling and simulation technology to simulate the stress and deformation state of 10kV distribution lines under different icing conditions, we can have a more comprehensive understanding of the impact of ice on conductors and tower structures, thus providing a scientific basis for the design and maintenance of power systems. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention is proposed.

[0006] Therefore, the problem to be solved by the present invention is that existing research mostly focuses on the impact of ice coating on the static mechanical properties of conductors, and lacks systematic dynamic simulation analysis.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] In a first aspect, an embodiment of the present invention provides a modeling and simulation method for uniform water-covered stress on conductors of a 10kV distribution line, which comprises:

[0009] Collecting micro-meteorological data of the distribution line area, the micro-meteorological data including wind speed and temperature; collecting uniform ice thickness of the conductor to calculate uniform ice load;

[0010] Establishing a three-dimensional physical model, and based on the three-dimensional physical model, using simulation software to set material property parameters of the corresponding structure to obtain a simulation model;

[0011] Based on the simulation model, the wind speed is set, and uniform ice loads of different thicknesses are set on the conductor, and then grid division and calculation are performed. Finally, the stress and deformation state of the conductor under different uniform ice loads are obtained, and the corresponding simulation curve graph is output.

[0012] As a preferred solution of the modeling and simulation method of uniform water-covered stress on the conductor of the 10kV distribution line of the present invention, the calculation of the uniform ice thickness includes:

[0013] Read the specific tension value from the tension sensor of the tower;

[0014] Calculate the self-weight load per unit length;

[0015] Calculate the uniform ice load per unit length.

[0016] As a preferred solution of the modeling and simulation method of uniform water-covered stress of 10kV distribution line conductors of the present invention, the calculation of the deadweight load per unit length is as follows:

[0017] q g =m0g b

[0018] Among them, g b is the standard gravitational acceleration, m0 is the mass of the conductor (ground) wire per unit length;

[0019] The calculation of the uniform ice load is shown in the following formula:

[0020]

[0021] Where, d is the uniform ice thickness of the conductor, D is the calculated outer diameter of the conductor, and d is the ice thickness.

[0022] As a preferred solution of the modeling and simulation method of uniform water-covered stress of 10kV distribution line conductors of the present invention, the three-dimensional physical model includes a straight cement single pole, a cable, a cross arm member and the top of an insulator;

[0023] The straight cement single pole adopts a medium-sized concrete single pole, which is suitable for medium and low altitude areas (used with standard specification insulated wires, and the conventional span design is about half a hundred meters; the straight cement single pole adopts a symmetrically arranged multiple steel reinforcement structure, and the ratio of the top and bottom diameters is about 3:5;

[0024] The cable is made of steel core aluminum stranded wire that meets national standards, has an outer diameter within the standard specification range, and has a moderate cross-sectional area and unit weight;

[0025] The cross arm member is made of straight angle steel, with a total length of about two meters, and uses standard equilateral angle steel. The ends are provided with insulator installation positions with standard spacing, and the matching arc-shaped connectors are designed to match the arc of the pole body to ensure the stability of the overall structure;

[0026] The insulator is a three-piece standard model.

[0027] As a preferred solution of the modeling and simulation method of uniform water-covered stress on the conductor of the 10kV distribution line of the present invention, the material property parameters of the corresponding structure are set by using the simulation software as follows:

[0028] The density of the conductor is 2700kg / m 3 , Poisson's ratio is 0.25, and Young's modulus is 7.6×10 10 Pa;

[0029] The density of the insulator is 3000kg / m 3 , Poisson's ratio is 0.25, and Young's modulus is 1.9×10 11 Pa;

[0030] The density of crossarms and hoop is 7850kg / m 3 , Poisson's ratio is 0.3, and Young's modulus is 1.9×10 11 Pa;

[0031] The density of the concrete rod is 600kg / m 3 , Poisson's ratio is 0.25, and Young's modulus is 4×10 10 Pa.

[0032] As a preferred solution of the modeling and simulation method of uniform water-covered stress on the conductor of the 10kV distribution line of the present invention, the wind speed is calculated as shown in the following formula:

[0033]

[0034] Among them, T Lv is the wind load on the power line, in N; θ is the wind pressure unevenness coefficient; v is the wind speed, in m / s; S is the power line shape coefficient; d is the outer diameter of the conductor, in m; b is the uniform ice thickness of the conductor, in m.

[0035] As a preferred solution of the modeling and simulation method of uniform water-covered stress on the conductor of the 10kV distribution line of the present invention, the uniform ice load of different thicknesses is set on the conductor as follows:

[0036] In the multi-physics field coupling software, the gravity load parameters corresponding to the wire are set, and the parametric scanning command is used on the corresponding wire boundary to add additional loads corresponding to the ice thickness of 0 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, and 30 mm to the boundary of the wire.

[0037] In a second aspect, an embodiment of the present invention provides a modeling and simulation system for uniform water-covered stress on conductors of a 10kV distribution line, comprising:

[0038] The data acquisition module is used to collect micro-meteorological data in the distribution line area, wherein the micro-meteorological data includes wind speed and temperature; collect the uniform ice thickness of the conductor to calculate the uniform ice load;

[0039] A model building module is used to establish a three-dimensional physical model, and based on the three-dimensional physical model, use simulation software to set material property parameters of the corresponding structure to obtain a simulation model;

[0040] The analysis module is used to set the wind speed based on the simulation model, set uniform ice loads of different thicknesses on the conductor, then perform grid division and calculation, and finally obtain the stress and deformation state of the conductor under different uniform ice loads, and output the corresponding simulation curve graph.

[0041] In a third aspect, an embodiment of the present invention provides a computer device, comprising a memory and a processor, wherein the memory stores a computer program, wherein: when the processor executes the computer program, it implements any step of the above-mentioned modeling and simulation method for uniform water-covered stress on conductors of a 10kV distribution line.

[0042] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, any step of the above-mentioned modeling and simulation method for uniform water-covered stress on conductors of a 10kV distribution line is implemented.

[0043] The beneficial effects of the present invention are as follows: Accurate stress and deformation analysis: The present invention uses SolidWorks and finite element analysis (FEA) methods to accurately simulate the stress and deformation of conductors and poles under different ice thicknesses, ensuring that the simulation results are highly accurate and reliable. It involves working conditions with a variety of ice thicknesses (0mm to 30mm), comprehensively considers the impact of different ice loads on distribution lines, and provides more comprehensive technical analysis and support. Detailed setting of material properties and working conditions: Detailed setting of material properties of conductors and poles, including elastic modulus, Poisson's ratio, density, etc., to ensure that the physical model is closer to the actual situation. Guidance on optimized design: Through simulation analysis, the vulnerable parts of the poles are identified, and suggestions for optimized design are put forward, which is helpful to improve the ability of distribution lines to resist ice disasters. Reduce test costs: By replacing some actual tests with simulation technology, the test costs and time are reduced, and the research efficiency is improved. Wide range of applications: It is not only applicable to 10kV distribution lines, but can also be extended to the simulation analysis of ice coverage of distribution lines of other voltage levels, providing a scientific basis for the design and maintenance of power systems. Provide reliable technical support: The simulation results can provide important technical support for the operation and maintenance, fault warning and emergency response of the power system, ensuring the safe and stable operation of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0045] Figure 1 Flow chart of the modeling and simulation method for uniform water-covered stress on conductors of 10kV distribution line.

[0046] Figure 2 This is a simulation model diagram of the modeling and simulation method for uniform water-covered stress on conductors of 10kV distribution line.

[0047] Figure 3 The conductor ice stress diagram is a modeling and simulation method for the uniform water-covered stress on the conductor of a 10kV distribution line.

[0048] Figure 4 The conductor ice deformation displacement diagram of the modeling and simulation method for the uniform water-covered stress on the conductor of a 10kV distribution line. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0050] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0051] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0052] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0053] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0054] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] Example 1

[0056] Reference Figure 1 and Figure 2, which is the first embodiment of the present invention, provides a modeling and simulation method for uniform water-covered stress of a 10kV distribution line conductor, comprising:

[0057] Step S1: First, the micro-meteorological data of the distribution line area, including wind speed and temperature, are collected through the wind speed sensor, temperature sensor and corresponding ice thickness monitoring sensor on the distribution line. The uniform ice thickness of the wire is collected to calculate the uniform ice load. The corresponding ice load under the ice thickness of 0mm, 5mm, 10mm, 15mm, 20mm, 25mm and 30mm is calculated by the formula. The corresponding calculation formula is as follows:

[0058] In actual engineering, the self-weight load per unit length of the conductor and ground wire is usually taken as the standard gravity acceleration gb = 9.80665m / s. If the mass of the conductor (ground wire) per unit length is m0, the self-weight load per unit length of the conductor (ground wire) is:

[0059] q g =m0g b

[0060] The uniform ice load per unit length of the conductor and ground wire is:

[0061] q i =0.9πg b 4 [(D+2d) 2 -D2]×10 -3

[0062] Where, d is the uniform ice thickness of the conductor, mm; D is the calculated outer diameter of the conductor, mm.

[0063] Step S2: using SolidWorks software to establish a three-dimensional physical model of the 10KV distribution line conductor and its auxiliary equipment, including insulators, straight cross arms, and reinforced concrete towers;

[0064] The 10-meter straight cement pole established by S2.1 is used in areas below 2,000 meters above sea level, with an outer diameter of 16.1mm and a spacing of 50 meters. The steel bar configuration of the cement pole is 12×Ф12, with a tip diameter of 190mm and a root diameter of 323mm.

[0065] The S2.2 cable uses JL / G1A-120 / 20 steel core aluminum stranded wire with an outer diameter of approximately 15.1mm, a cross-sectional area of ​​134.49mm2, a unit length weight of 0.47kg / m, a calculated breaking force of 42.26kN, a maximum operating stress of 36.97MPa, a safety factor of 8.5, and a maximum tensile force of 314.245MPa.

[0066] S2.3 straight cross arm angle steel is 2100mm long, 75mm wide, 6mm thick, the angle steel angle is 90 degrees, the distance from the end insulator mounting hole to the center is 1000mm, the inner diameter of the arc flat steel is 190mm, the thickness is 8mm, and the total length is 540mm.

[0067] The top diameter of the S2.4 insulator is 80mm, the nominal diameter of the three porcelain pieces is 125mm, and the nominal total height is 306mm.

[0068] Step S3: According to the three-dimensional model established in step S2, the three-dimensional model is imported into COMSOL multi-physics field coupling simulation software, and material parameters corresponding to the material properties of each structure are set;

[0069] S3.1 The density of the conductor is 2700kg / m 3 , Poisson's ratio is 0.25, and Young's modulus is 7.6×1010Pa;

[0070] The density of S3.2 insulator is 3000kg / m 3 , Poisson's ratio is 0.25, and Young's modulus is 1.9×1011Pa;

[0071] S3.3 The density of cross arm and hoop is 7850kg / m 3 , Poisson's ratio is 0.3, and Young's modulus is 1.9×1011Pa;

[0072] S3.4 The density of the concrete rod is 600kg / m 3 , Poisson's ratio is 0.25, Young's modulus is 4×1010Pa,

[0073] Step S4: According to the simulation model constructed in step S3, the corresponding wind speed is set, and uniform ice loads of different thicknesses are set on the conductor, and then grid division and calculation are performed. Finally, the stress and deformation state of the conductor under different uniform ice loads are obtained, and the corresponding simulation curve graph is output.

[0074] S4.1 In the "Mesh" module, select the ultra-fine meshing command in "Free Tetrahedral" to mesh the model.

[0075] S4.2In the “Study” module, add a physics direct solver.

[0076] S4.3 In the "Boundary Conditions" module, set the boundary conditions of the conductor, and set the fixed end to two-thirds of the foundation depth of the tower bottom, about 1.7m.

[0077] S4.4 In the “Solve” module, run the simulation to calculate the stress and deformation state of the wire at 0 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, and 30 mm.

[0078] S4.5 In the “Results” module, extract stress, strain and deformation data and generate corresponding simulation curve graphs.

[0079] More specifically, the corresponding wind speed calculation formula is:

[0080]

[0081] Wherein, TLv is the wind load on the power line, in N; θ is the wind pressure unevenness coefficient, which is generally taken as 1.0 when the wind speed is less than 20 m / s, 0.85 when it is greater than 20 m / s and less than 27 m / s, 0.75 when it is greater than 27 m / s and less than 31.5 m / s, and 0.7 when it is greater than 31.5 m / s; v is the wind speed, in m / s; S is the power line body coefficient; d is the outer diameter of the conductor, in m; b is the uniform ice thickness of the conductor, in m.

[0082] Furthermore, this embodiment also provides a modeling and simulation system for uniform water-covered stress on conductors of a 10kV distribution line, including:

[0083] The data acquisition module is used to collect micro-meteorological data in the distribution line area, wherein the micro-meteorological data includes wind speed and temperature; collect the uniform ice thickness of the conductor to calculate the uniform ice load;

[0084] A model building module is used to establish a three-dimensional physical model, and based on the three-dimensional physical model, use simulation software to set material property parameters of the corresponding structure to obtain a simulation model;

[0085] The analysis module is used to set the wind speed based on the simulation model, set uniform ice loads of different thicknesses on the conductor, then perform grid division and calculation, and finally obtain the stress and deformation state of the conductor under different uniform ice loads, and output the corresponding simulation curve graph.

[0086] This embodiment also provides a computer device, which is suitable for the modeling and simulation method of uniform water-covered stress on 10kV distribution line conductors, including a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute computer-executable instructions to implement the modeling and simulation method of uniform water-covered stress on 10kV distribution line conductors as proposed in the above embodiment.

[0087] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0088] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the modeling and simulation method for realizing uniform water-covered stress on conductors of a 10kV distribution line as proposed in the above embodiment is implemented.

[0089] The storage medium proposed in this embodiment and the data storage method proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be found in the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0090] Example 2

[0091] Reference Figure 3 and Figure 4 , which is the second embodiment of the present invention, and this embodiment provides a modeling and simulation method for uniform water-covered stress on conductors of a 10kV distribution line. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0092] This embodiment uses a mountain distribution line of a provincial power grid company as the research object, and selects a 10kV distribution line in a mountain area at an altitude of 1,850 meters for experimental research. This area is prone to ice disasters in winter, with an annual average temperature of 4.2°C, a minimum temperature of -15°C, and an annual average wind speed of 8.5m / s. The test area selected two spans between adjacent three-base towers, each span is 50 meters, and a total of 100 meters of line sections for experimental research.

[0093] During the test preparation phase, NRG#40C wind speed sensors (measuring range 0-96m / s, accuracy ±0.1m / s) and PT100 temperature sensors (measuring range -50℃ to +100℃, accuracy ±0.1℃) were installed on the three towers. To accurately monitor the ice thickness, a fiber Bragg grating-based ice thickness monitoring sensor (measuring range 0-50mm, accuracy ±0.2mm) was installed at the midpoint of each span. All sensors were connected to the field data collector via the RS485 bus, and the sampling frequency was set to 30s / time.

[0094] The 3D physical model was established using SolidWorks 2023 Professional Edition software. During the modeling process, special attention was paid to the following details: (1) The cement pole foundation was made of C30 concrete, and considering the depth of the frozen soil layer, the burial depth was designed to be 2.5 meters; (2) The cross arm was treated with hot-dip galvanizing technology, and the thickness of the surface galvanized layer was not less than 86μm; (3) The insulator was made of composite insulators with silicone rubber insulation sheds, which had excellent anti-pollution flashover performance.

[0095] The established 3D model was imported into COMSOL Multiphysics 6.1 for simulation analysis. When setting the material parameters, the temperature correction was made to the material parameters of each component, taking into account the influence of temperature on material properties. The meshing technology was used for meshing, which was automatically encrypted in the stress concentration area. The minimum mesh size was 0.5 mm, the maximum mesh size was 50 mm, and the total number of mesh units reached 786,452.

[0096] In order to simulate different icing conditions, 7 icing thickness conditions (0mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm) were designed, combined with 4 typical wind speed conditions (5m / s, 10m / s, 15m / s, 20m / s), a total of 28 combined conditions were simulated and analyzed. Stress distribution, displacement deformation and vibration characteristics were analyzed under each condition.

[0097] The following Tables 1 and 2 are relevant experimental data tables.

[0098] Table 1 Conductor stress distribution characteristics under different ice thickness

[0099]

[0100] Table 2 Conductor dynamic response characteristics data under different wind speed conditions

[0101]

[0102]

[0103] Through the systematic analysis of the test data, the following key findings can be drawn: It can be seen from the data in Table 1 that with the increase of ice thickness, the maximum stress of the conductor shows a nonlinear growth trend. When the ice thickness increases from 0mm to 30mm, the maximum stress increases from 75.6MPa to 275.4MPa, an increase of 264%. Especially after the ice thickness exceeds 20mm, the stress growth rate is significantly accelerated. The stress concentration coefficient also increases with the increase of ice thickness, from 1.25 to 2.28, indicating that ice will aggravate the local stress concentration phenomenon. Through the intelligent monitoring method proposed in the present invention, stress changes can be monitored in real time. When the stress is close to the allowable stress of the material (about 314.245MPa), the system will issue a timely warning to provide a decision-making basis for the operation and maintenance personnel to take de-icing measures.

[0104] The maximum displacement of the conductor shows a significant positive correlation with the ice thickness, increasing from 156.3mm to 498.7mm, an increase of 219%. At the same time, the vibration frequency decreases with the increase of ice thickness, from 2.85Hz to 1.22Hz, a decrease of 57.2%. This reduction in frequency means that the system stiffness decreases and it is more likely to produce large vibrations. The present invention can accurately predict the evolution trend of system stability by monitoring the changes in the vibration characteristics of the conductor in real time.

[0105] From the data in Table 2, it can be found that wind speed has a significant effect on the dynamic response of the conductor. When the wind speed increases from 5m / s to 30m / s, the dynamic displacement increases by 1133% (from 25.6mm to 315.6mm). It is particularly noteworthy that the increase in the amplitude of vortex-induced vibration is more significant, from 1.25mm to 18.65mm, an increase of 1392%. This shows that under high wind speed conditions, the dynamic response of the conductor is more intense. The multi-physics field coupling simulation model established by the present invention can accurately predict the dynamic response characteristics under different wind speed conditions.

[0106] Combined with the influence of temperature factors, the data shows that during the temperature reduction process (from -5°C to -15°C), the strain energy of the wire increases significantly (from 125.6J to 512.9J). This energy accumulation may cause system instability. By establishing a coupled relationship between temperature, stress and deformation, the present invention can more accurately evaluate the safety margin of the system. The data shows that when the ice thickness reaches 30mm, the safety margin is reduced to 1.14, which is close to the critical state.

[0107] From the above analysis, it can be seen that the model constructed by the modeling and simulation method of uniform water-covered stress on 10kV distribution line conductors proposed in the present invention can not only accurately obtain the dynamic response characteristics of the conductors under the coupling of ice and wind speed, but also timely predict the risk of system instability, providing reliable technical support for power grid operation and maintenance decisions. This method has significant advantages in improving monitoring accuracy, early warning timeliness and system adaptability, and has important engineering application value for improving the reliability of power grid operation.

[0108] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A modeling and simulation method for uniform water-covered stress on conductors of a 10kV distribution line, characterized in that: include, Collecting micro-meteorological data of the distribution line area, the micro-meteorological data including wind speed and temperature; collecting uniform ice thickness of the conductor to calculate uniform ice load; Establishing a three-dimensional physical model, and based on the three-dimensional physical model, using simulation software to set material property parameters of the corresponding structure to obtain a simulation model; Based on the simulation model, the wind speed is set, and uniform ice loads of different thicknesses are set on the conductor, and then grid division and calculation are performed. Finally, the stress and deformation state of the conductor under different uniform ice loads are obtained, and the corresponding simulation curve graph is output.

2. The modeling and simulation method for uniform water-covered stress of 10kV distribution line conductors according to claim 1, characterized in that: The uniform ice thickness calculation includes: Read the specific tension value from the tension sensor of the tower; Calculate the self-weight load per unit length; Calculate the uniform ice load per unit length.

3. The modeling and simulation method for uniform water-covered stress of 10kV distribution line conductors as claimed in claim 2, characterized in that: The calculation of the self-weight load per unit length is shown as follows: q g =m0g b Among them, g b is the standard gravitational acceleration, m0 is the mass of the conductor (ground) wire per unit length; The calculation of the uniform ice load is shown in the following formula: Where, d is the uniform ice thickness of the conductor, D is the calculated outer diameter of the conductor, and d is the ice thickness.

4. The modeling and simulation method for uniform water-covered stress of a 10kV distribution line conductor as claimed in claim 3, characterized in that: The three-dimensional physical model includes a straight cement single pole, a cable, a cross arm member and an insulator top; The straight cement single pole adopts a medium-sized concrete single pole, which is suitable for medium and low altitude areas (used with standard specification insulated wires, and the conventional span design is about half a hundred meters; the straight cement single pole adopts a symmetrically arranged multiple steel reinforcement structure, and the ratio of the top and bottom diameters is about 3:5; The cable is made of steel core aluminum stranded wire that meets national standards, has an outer diameter within the standard specification range, and has a moderate cross-sectional area and unit weight; The cross arm member is made of straight angle steel, with a total length of about two meters, and uses standard equilateral angle steel. The ends are provided with insulator installation positions with standard spacing, and the matching arc-shaped connectors are designed to match the arc of the pole body to ensure the stability of the overall structure; The insulator is a three-piece standard model.

5. The modeling and simulation method for uniform water-covered stress of 10kV distribution line conductors as claimed in claim 4, characterized in that: The material property parameters of the corresponding structure are set by using simulation software as follows: The density of the conductor is 2700kg / m 3 , Poisson's ratio is 0.25, and Young's modulus is 7.6×10 10 Pa; The density of the insulator is 3000kg / m 3 , Poisson's ratio is 0.25, and Young's modulus is 1.9×10 11 Pa; The density of crossarms and hoop is 7850kg / m 3 , Poisson's ratio is 0.3, and Young's modulus is 1.9×10 11 Pa; The density of the concrete rod is 600kg / m 3 , Poisson's ratio is 0.25, and Young's modulus is 4×10 10 Pa.

6. The modeling and simulation method for uniform water-covered stress of 10kV distribution line conductors as claimed in claim 5, characterized in that: The wind speed is calculated as follows: Among them, T Lv is the wind load on the power line, in N; θ is the wind pressure unevenness coefficient; v is the wind speed, in m / s; S is the power line shape coefficient; d is the outer diameter of the conductor, in m; b is the uniform ice thickness of the conductor, in m.

7. The modeling and simulation method for uniform water-covered stress of 10kV distribution line conductors according to claim 6, characterized in that: The uniform ice load with different thicknesses is set on the conductor as follows: In the multi-physics field coupling software, the gravity load parameters corresponding to the wire are set, and the parametric scanning command is used on the corresponding wire boundary to add additional loads corresponding to the ice thickness of 0 mm, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, and 30 mm to the boundary of the wire.

8. A modeling and simulation system for uniform water-covered stress on conductors of a 10kV distribution line, based on the modeling and simulation method for uniform water-covered stress on conductors of a 10kV distribution line according to any one of claims 1 to 7, characterized in that: include, The data acquisition module is used to collect micro-meteorological data in the distribution line area, wherein the micro-meteorological data includes wind speed and temperature; collect the uniform ice thickness of the conductor to calculate the uniform ice load; A model building module is used to establish a three-dimensional physical model, and based on the three-dimensional physical model, use simulation software to set material property parameters of the corresponding structure to obtain a simulation model; The analysis module is used to set the wind speed based on the simulation model, set uniform ice loads of different thicknesses on the conductor, then perform grid division and calculation, and finally obtain the stress and deformation state of the conductor under different uniform ice loads, and output the corresponding simulation curve graph.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the modeling and simulation method for uniform water-covered stress on conductors of a 10kV distribution line as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the modeling and simulation method for uniform water-covered stress of a 10kV distribution line conductor as described in any one of claims 1 to 7 are implemented.

Images