Corrosion time-varying stability bearing capacity assessment method and system for smart grid

Abstract

The present invention provides a method and system for evaluating the time-varying stable bearing capacity of corrosion for smart grids, which relates to the technical field of smart grids. The method includes: obtaining basic data of grid engineering; solving the axial internal force borne by the angle steel component at time T according to the basic data of grid engineering and the physical parameters of the angle steel component; obtaining the corrosion pollution level of the position of the angle steel component in real time, and calculating the time-varying loss thickness of the angle steel component after corrosion at time T according to the corrosion pollution level; evaluating and judging the corrosion bearing capacity of the angle steel component under the time-varying state according to the calculation principle of corrosion degradation bearing capacity under the age state. The system includes: a basic parameter library, a physical parameter library, a spatial internal force calculation station, a corrosion parameter library and a bearing capacity evaluation unit. From the perspective of time-varying corrosion, the present invention can realize the evaluation of the time-varying corrosion compressive stable bearing capacity of the angle steel component under long-term atmospheric corrosion, and provide a scientific and accurate reference for finding safety hazards in the operation of the grid.

Description

Technical Field

[0001] The present invention relates to the technical field of smart grids, and in particular to a method and system for evaluating the corrosion time-varying stability bearing capacity of smart grids. Background Art

[0002] The construction process of digital power grid is the process of digitizing, intelligentizing and internetizing the traditional power grid. By following the network security standards and unified power grid data model to build the corresponding digital twin power grid, the advanced digital technology platform is used to form a powerful "computing power" with "computing power + data + model + algorithm". Relying on the Internet of Things and the Internet to connect the perception, analysis, decision-making, business and other links of all parties related to the power grid, the power grid company has super perception ability, wise decision-making ability and rapid execution ability. Durable power grid refers to a power grid that can fully, quickly and accurately perceive the operation status of the power grid, coordinate internal and external resources of the power grid, make active predictions and active preparations for various disturbances, take the initiative to defend, quickly restore important power loads, and can self-learn and continuously improve. However, up to now, relevant research results in these fields are still relatively lacking, which is not conducive to the stable and high-quality development of the digital power grid field.

[0003] Specifically, in the construction of digital power grids and durable power grids, the reliable and stable operation of transmission towers is indispensable. Among them, angle steel components are one of the main components that affect the safe operation of transmission towers. It has become mainstream to use digital means to evaluate their bearing capacity. Although there are relevant methods for evaluating the bearing capacity of angle steel components, these methods ignore the characteristics of long operation cycle and high stability requirements of transmission networks. There is a problem that it is difficult to actually measure the corrosion degree of each angle steel component. In addition, during operation, the environment where the angle steel components are located may also change greatly. In general, on the one hand, none of the existing evaluation methods starts from the perspective of time-varying corrosion, and it is difficult to evaluate the stable bearing capacity of angle steel components under time-varying corrosion under long-term atmospheric corrosion. The real-time and accuracy of the evaluation results are poor, and it is difficult to provide effective reference for power grid engineering construction. On the other hand, the existing evaluation methods are not intelligent and automated enough to meet the needs of digital power grid construction. Summary of the invention

[0004] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art.

[0005] To this end, a first aspect of the present invention provides a method for evaluating the corrosion time-varying stability bearing capacity of a smart grid.

[0006] A second aspect of the present invention provides a corrosion time-varying stability bearing capacity assessment system for a smart grid.

[0007] The present invention provides a method for evaluating the corrosion time-varying stability bearing capacity of a smart grid, comprising:

[0008] Acquire basic data of the power grid project, wherein the basic data of the power grid project at least includes load information, operating years and operating position of the angle steel component;

[0009] An explicit solution matrix for solving the axial internal force of the angle steel component is constructed according to the basic data of the power grid project and the physical parameters of the angle steel component, thereby obtaining the axial internal force borne by the angle steel component at time T; wherein the explicit solution matrix includes the stiffness matrix of the angle steel component and the node deformation matrix of the angle steel component;

[0010] Obtain the corrosion pollution level of the angle steel component's geographical location in real time, and calculate the time-varying loss thickness of the angle steel component after corrosion at time T based on the corrosion pollution level;

[0011] The corrosion bearing capacity of angle steel components under time-varying conditions is evaluated and judged based on the calculation principle of corrosion degradation bearing capacity under age conditions. The evaluation principle includes that the axial internal force borne by the angle steel component at time T should not be greater than the corrosion time-varying compressive stable bearing capacity of the angle steel component under the current corrosion environment level. The corrosion time-varying compressive stable bearing capacity of the angle steel component is related to the ratio of the time-varying loss thickness of the angle steel component after corrosion at time T to the thickness of the intact limb of the angle steel component.

[0012] The corrosion time-varying stability bearing capacity assessment method for smart grid according to the above technical solution of the present invention may also have the following additional technical features:

[0013] In the above technical solution, the physical parameters of the angle steel component include the three-dimensional model data, constraint information, material parameters and specification bolt information of the angle steel component.

[0014] In the above technical solution, the explicit matrix solution includes:

[0015]

[0016] in, represents the axial internal force matrix of the angle steel member, represents the stiffness matrix of the angle steel member, Represents the deformation matrix of the angle steel member node.

[0017] In the above technical solution, the corrosion pollution levels include C1 level, C2 level, C3 level and C4 level divided according to the ISO 12944 corrosion environment judgment standard.

[0018] In the above technical solution, the calculation of the time-varying loss thickness of the angle steel member after corrosion at time T according to the corrosion pollution level includes:

[0019] When the corrosion pollution level is C1:

[0020]

[0021] When the corrosion pollution level is C2:

[0022]

[0023] When the corrosion pollution level is C3:

[0024]

[0025] When the corrosion pollution level is C4:

[0026]

[0027] in, Represents the time-varying loss thickness of the angle steel component after corrosion at time T.

[0028] In the above technical solution, the evaluation principle is:

[0029]

[0030] Indicates the axial internal force borne by the angle steel member at time T; Indicates the thickness of the angle steel member without damage; represents the compressive stability reduction factor; Indicates the original stability factor of the angle steel member; It indicates the gross cross-sectional area of ​​the angle steel member when it is intact; Indicates the yield strength of angle steel; Represents the material partial factor of angle steel components.

[0031] In the above technical scheme, when the evaluation principles are met, it means that the corrosion time-varying stable bearing capacity of the angle steel component meets the line operation requirements and can continue to operate; when the evaluation principles are not met, it means that the corrosion time-varying stable bearing capacity of the angle steel component does not meet the line operation requirements and needs to be repaired or rebuilt.

[0032] The corrosion time-varying stability bearing capacity assessment system for smart grid proposed by the present invention is applied to the method as described in any one of the above technical solutions, including:

[0033] Basic parameter library, used to store load information, service life and operating position of angle steel components;

[0034] Physical parameter library, used to store the physical parameters of angle steel components;

[0035] The spatial internal force calculation station obtains the data stream from the basic parameter library and the physical parameter database according to the calculation object, and solves the axial internal force borne by the angle steel member at time T;

[0036] The corrosion parameter library stores real-time updated data on corrosion pollution levels corresponding to different geographical locations, and reads the corrosion pollution level corresponding to the calculation object according to the operating position of the angle steel component;

[0037] The bearing capacity assessment unit calculates the time-varying loss thickness of the angle steel component after corrosion at time T according to the corrosion pollution level corresponding to the calculation object; based on the calculation results of the spatial internal force calculation station, the time-varying loss thickness of the angle steel component after corrosion at time T, and the physical parameters of the angle steel component, the corrosion bearing capacity of the angle steel component under the time-varying state is assessed and judged according to the calculation principle of corrosion degradation bearing capacity under the age state.

[0038] In the above technical solution, the physical parameter library includes a material parameter library, a three-dimensional model library and a specification bolt library.

[0039] In the above technical solution, the system also includes:

[0040] The data output terminal is connected to the bearing capacity assessment unit and is used to display the assessment and judgment results of the bearing capacity assessment unit.

[0041] In summary, due to the adoption of the above technical features, the beneficial effects of the present invention are:

[0042] From the perspective of time-varying corrosion, the present invention proposes a method and system for evaluating the time-varying stable bearing capacity of angle steel components under corrosion, which can realize the evaluation of the time-varying corrosion compressive stable bearing capacity of angle steel components under long-term atmospheric corrosion, fully consider the influence of the corrosion environment level on the bearing capacity of angle steel components, and evaluate the bearing capacity of angle steel components in real time. It has a high degree of intelligence and meets the actual needs of the pole tower operation cycle. It provides a scientific and accurate reference for finding safety hazards in power grid operation, can realize the construction of a full life cycle smart grid, and further promote the digitalization and durability of the power grid.

[0043] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0045] Figure 1 It is a flow chart of a method for evaluating the corrosion time-varying stability carrying capacity of a smart grid according to an embodiment of the present invention;

[0046] Figure 2It is a schematic diagram of the framework of a corrosion time-varying stability bearing capacity assessment system for a smart grid according to an embodiment of the present invention. DETAILED DESCRIPTION

[0047] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0048] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0049] Refer to the following Figure 1 and Figure 2 The following describes a method for evaluating the corrosion time-varying stability bearing capacity of a smart grid provided according to some embodiments of the present invention.

[0050] Some embodiments of the present application provide a method for evaluating the time-varying stability bearing capacity of corrosion for a smart grid.

[0051] like Figure 1 As shown, the first embodiment of the present invention proposes a corrosion time-varying stability bearing capacity assessment method for a smart grid, including steps S1-S4. It should be noted that the order of steps S1-S4 referred to in the present disclosure is only a schematic representation. In actual application, those skilled in the art can adjust it according to actual needs, and steps of different orders can also be executed simultaneously.

[0052] S1. Obtain basic data of power grid engineering, which at least includes load information, operating years and operating positions of angle steel components. It is understandable that the basic data of power grid engineering can directly call the data stored in the power grid database, or can be collected by designers. In some embodiments, the basic data of power grid engineering also includes the importance coefficient of the angle steel component, which is mainly used to participate in the conversion of axial internal force.

[0053] S2. Construct an explicit solution matrix for solving the axial internal force of the angle steel component according to the basic data of the power grid project and the physical parameters of the angle steel component, and then obtain the axial internal force borne by the angle steel component at time T; wherein the explicit solution matrix includes the stiffness matrix of the angle steel component and the node deformation matrix of the angle steel component.

[0054] Specifically, the physical parameters of the angle steel component include the three-dimensional model data, constraint information, material parameters and specification bolt information of the angle steel component. It can be understood that the physical parameters of the angle steel component are the necessary parameters for calculating the axial internal force according to the load conditions of the angle steel component. The specific axis internal force calculation method can adopt any of the existing methods for calculating the axial internal force borne by the angle steel component, which will not be repeated here.

[0055] In this disclosure, in order to improve the calculation efficiency, the mechanical calculation model and stiffness calculation model of the angle steel component are constructed according to the three-dimensional model data, load information, and constraint information, and the calculation is performed with the rod as the unit. The explicit solution matrix formed is as follows:

[0056]

[0057] in, represents the axial internal force matrix of the angle steel member, represents the stiffness matrix of the angle steel member, represents the node deformation matrix of the angle steel component. The stiffness and node deformation of the angle steel component are contents that can be known and obtained by those skilled in the art based on physical parameters.

[0058] The meaning of using the rod as a unit for calculation is that the above matrix is ​​the unit matrix of all angle steel components on the pole tower, that is, an explicit solution matrix can be used to calculate the axial internal force of all angle steel components that need to be concerned on a pole tower.

[0059] S3. Obtain the corrosion pollution level of the geographical location of the angle steel component in real time, and calculate the time-varying loss thickness of the angle steel component after corrosion at time T according to the corrosion pollution level.

[0060] It can be understood that in this disclosure, the corrosion pollution level of the angle steel component at its current operating position and operating years is used as the basis for calculating the corrosion degree of the angle steel component, and the corrosion conditions under different corrosion pollution levels are calculated separately, which is more in line with the actual operating conditions of the line.

[0061] In a specific embodiment, the corrosion pollution level includes C1 level, C2 level, C3 level and C4 level divided according to the ISO 12944 corrosion environment judgment standard. ISO 12944 is a recognized international reference standard in the field of coating corrosion protection of current steel structures. C1 level, C2 level, C3 level and C4 level are corrosion pollution levels clearly divided in the standard, corresponding to very low, low, medium and high corrosion degrees respectively. These four levels are common levels for power transmission line projects.

[0062] S4. Evaluate and judge the corrosion bearing capacity of angle steel members under time-varying conditions based on the calculation principle of corrosion degradation bearing capacity under age conditions. The evaluation principle includes that the axial internal force borne by the angle steel member at time T should not be greater than the corrosion time-varying compressive stable bearing capacity of the angle steel member under the current corrosion environment level. The corrosion time-varying compressive stable bearing capacity of the angle steel member is related to the ratio of the time-varying loss thickness of the angle steel member after corrosion at time T to the thickness of the intact limb of the angle steel member.

[0063] It can be understood that the calculation principle of corrosion degradation bearing capacity under the state of age refers to further detailed calculation of the corrosion bearing capacity of angle steel components under the time-varying state based on the calculation principle of traditional rough calculation of corrosion bearing capacity.

[0064] In a specific embodiment, for the above-mentioned corrosion pollution level, the present disclosure conducts research on the time-varying loss thickness of angle steel components under different corrosion pollution levels, and finally forms the following method for calculating the time-varying loss thickness of angle steel components after corrosion at time T. Specifically, the method for calculating the time-varying loss thickness of angle steel components after corrosion at time T according to the corrosion pollution level includes:

[0065] When the corrosion pollution level is C1:

[0066]

[0067] When the corrosion pollution level is C2:

[0068]

[0069] When the corrosion pollution level is C3:

[0070]

[0071] When the corrosion pollution level is C4:

[0072]

[0073] in, It represents the time-varying loss thickness of the angle steel component after corrosion at time T. T is used to indicate the time from the commissioning of the angle steel component or the last statistics to the present.

[0074] Specifically, the corrosion bearing capacity of the angle steel component under the time-varying state is evaluated based on the calculated axial internal force borne by the angle steel component at time T and the time-varying loss thickness of the angle steel component after corrosion at time T. The evaluation principle is specifically as follows:

[0075]

[0076] Indicates the axial internal force borne by the angle steel member at time T; Indicates the thickness of the angle steel member without damage; represents the compressive stability reduction factor; Indicates the original stability factor of the angle steel member; It indicates the gross cross-sectional area of ​​the angle steel member when it is intact; Indicates the yield strength of angle steel; Represents the material partial factor of the angle steel component. , , , , All values ​​can be taken according to the current specifications.

[0077] When the evaluation principles are met, it means that the corrosion time-varying stable bearing capacity of the angle steel component meets the line operation requirements and can continue to operate; when the evaluation principles are not met, it means that the corrosion time-varying stable bearing capacity of the angle steel component does not meet the line operation requirements and needs to be repaired or rebuilt.

[0078] Some other embodiments of the present invention provide a corrosion time-varying stability bearing capacity assessment system for a smart grid, which is applied to the method described in any of the above embodiments, such as Figure 2 As shown, the system includes: a basic parameter library, a physical parameter library, a spatial internal force calculation station, a corrosion parameter library, a bearing capacity evaluation unit and a data output terminal. Among them, the bearing capacity evaluation unit is schematically shown as a corrosion bearing capacity evaluation center.

[0079] The basic parameter library is used to store parameters such as load information, service life, importance coefficient and operating position of angle steel components.

[0080] The physical parameter library is used to store the physical parameters of angle steel components; specifically, it includes the material parameter library, 3D model library and specification bolt library. The material parameter library records the elastic modulus, yield strength, design strength and cross-sectional information corresponding to the component specifications of the steel; the 3D model library records the length, node coordinates and calculated length information of the component; the specification bolt library records the bolt specifications, shear strength and compressive strength of the bolts and other information.

[0081] The spatial internal force calculation station obtains the data stream in the basic parameter library and the physical parameter database according to the calculation object, and solves the axial internal force borne by the angle steel component at time T. It can be understood that the spatial internal force calculation station stores and executes an algorithm for calculating the axial internal force of the angle steel component according to the basic parameters and physical parameters.

[0082] The corrosion parameter library stores real-time updated corrosion pollution level data corresponding to different geographical locations, and reads the corrosion pollution level corresponding to the calculation object according to the operating position of the angle steel component;

[0083] The bearing capacity evaluation unit calculates the time-varying loss thickness of the angle steel component after corrosion at time T according to the corrosion pollution level corresponding to the calculation object; and based on the calculation results of the spatial internal force calculation station, the time-varying loss thickness of the angle steel component after corrosion at time T, and the physical parameters of the angle steel component, the corrosion bearing capacity of the angle steel component under the time-varying state is evaluated and judged according to the calculation principle of the corrosion degradation bearing capacity under the age state. In a specific embodiment, if the evaluation principle is met, "satisfied" can be displayed in the GUI interface of the bearing capacity evaluation unit, and the color mark is green; if the evaluation principle is not met, "not satisfied" can be displayed in the GUI interface of the bearing capacity evaluation unit, and the color mark is red.

[0084] The data output terminal is connected to the bearing capacity assessment unit and is used to display the assessment and judgment results of the bearing capacity assessment unit. Specifically, after receiving the result data stream transmitted by the bearing capacity assessment unit, the data output terminal will upload the assessment results to the owner and wait for the owner to make final instructions on the assessment results, including "assessment results meet the requirements, continue to operate", "assessment results do not meet the requirements, repair and reinforcement is required", "assessment results do not meet the requirements, the line will be scrapped and rebuilt". After the owner's instructions are confirmed, the terminal will generate the final assessment analysis report, and after the owner's internal approval, signature, and stamping at all levels, the final finished product report (PDF encrypted format) will be output for reference by the owner, construction, and operation and maintenance.

[0085] In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for evaluating the time-varying stability bearing capacity of corrosion for smart grids, characterized in that: include: Acquire basic data of the power grid project, wherein the basic data of the power grid project at least includes load information, operating years and operating position of the angle steel component; An explicit solution matrix for solving the axial internal force of the angle steel component is constructed according to the basic data of the power grid project and the physical parameters of the angle steel component, thereby obtaining the axial internal force borne by the angle steel component at time T; wherein the explicit solution matrix includes the stiffness matrix of the angle steel component and the node deformation matrix of the angle steel component; Obtain the corrosion pollution level of the angle steel component's geographical location in real time, and calculate the time-varying loss thickness of the angle steel component after corrosion at time T based on the corrosion pollution level; The corrosion bearing capacity of angle steel components under time-varying state is evaluated and judged according to the calculation principle of corrosion degradation bearing capacity under age state. The evaluation principle includes that the axial internal force borne by the angle steel component at time T should not be greater than the corrosion time-varying compressive stable bearing capacity of the angle steel component under the current corrosion environment level. The corrosion time-varying compressive stable bearing capacity of the angle steel component is related to the ratio of the time-varying loss thickness of the angle steel component after corrosion at time T to the thickness of the intact limb of the angle steel component. The corrosion pollution levels include C1, C2, C3 and C4 levels divided according to the ISO 12944 corrosion environment judgment standard; The method of calculating the time-varying loss thickness of the angle steel member after corrosion at time T according to the corrosion pollution level includes: When the corrosion pollution level is C1: When the corrosion pollution level is C2: When the corrosion pollution level is C3: When the corrosion pollution level is C4: in, Represents the time-varying loss thickness of the angle steel component after corrosion at time T.

2. The corrosion time-varying stability bearing capacity assessment method for smart grid according to claim 1 is characterized in that: The physical parameters of the angle steel component include three-dimensional model data, constraint information, material parameters and specification bolt information of the angle steel component.

3. The corrosion time-varying stability bearing capacity assessment method for smart grid according to claim 2 is characterized in that: The explicit solution matrix includes: in, represents the axial internal force matrix of the angle steel member, represents the stiffness matrix of the angle steel member, Represents the deformation matrix of the angle steel member node.

4. The corrosion time-varying stability bearing capacity assessment method for smart grid according to claim 1 is characterized in that: The evaluation principles are: Indicates the axial internal force borne by the angle steel member at time T; Indicates the thickness of the angle steel member without damage; represents the compressive stability reduction factor; Indicates the original stability factor of the angle steel member; It indicates the gross cross-sectional area of ​​the angle steel member when it is intact; Indicates the yield strength of angle steel; Represents the material partial factor of angle steel components.

5. The corrosion time-varying stability bearing capacity assessment method for smart grid according to claim 4 is characterized in that: When the evaluation principles are met, it means that the corrosion time-varying stable bearing capacity of the angle steel component meets the line operation requirements and can continue to operate; when the evaluation principles are not met, it means that the corrosion time-varying stable bearing capacity of the angle steel component does not meet the line operation requirements and needs to be repaired or rebuilt.

6. A corrosion time-varying stability bearing capacity assessment system for smart grid, characterized in that: The method as claimed in any one of claims 1 to 5, comprising: Basic parameter library, used to store load information, service life and operating position of angle steel components; Physical parameter library, used to store the physical parameters of angle steel components; The spatial internal force calculation station obtains the data stream from the basic parameter library and the physical parameter database according to the calculation object, and solves the axial internal force borne by the angle steel member at time T; The corrosion parameter library stores real-time updated data on corrosion pollution levels corresponding to different geographical locations, and reads the corrosion pollution level corresponding to the calculation object according to the operating position of the angle steel component; The bearing capacity assessment unit calculates the time-varying loss thickness of the angle steel component after corrosion at time T according to the corrosion pollution level corresponding to the calculation object; based on the calculation results of the spatial internal force calculation station, the time-varying loss thickness of the angle steel component after corrosion at time T, and the physical parameters of the angle steel component, the corrosion bearing capacity of the angle steel component under the time-varying state is assessed and judged according to the calculation principle of corrosion degradation bearing capacity under the age state.

7. The corrosion time-varying stability bearing capacity assessment system for smart grid according to claim 6 is characterized in that: The physical parameter library includes a material parameter library, a three-dimensional model library and a specification bolt library.

8. The corrosion time-varying stability bearing capacity assessment system for smart grid according to claim 6 is characterized in that: Also includes: The data output terminal is connected to the bearing capacity assessment unit and is used to display the assessment and judgment results of the bearing capacity assessment unit.

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