Wind-ice coupled corrosion reliability assessment method and system for digital power grid

Abstract

The present invention provides a wind-ice coupling corrosion reliability assessment method and system applied to digital power grids, which relates to the technical field of digital power grids. The method includes: obtaining basic parameter information of transmission towers; calculating the wind-ice coupling effect ratio of transmission towers under different ice coating thicknesses and design wind speeds; determining the corrosion environment impact coefficient according to the atmospheric corrosion environment level; performing reliability simulation calculation of transmission tower components under the current operating time based on the wind-ice coupling effect ratio; calculating the comprehensive time-varying reliability according to the simulated reliability and the corrosion environment impact coefficient; and evaluating the reliability of the transmission tower according to the comprehensive time-varying reliability to determine whether repair and reinforcement are required. The system includes a basic database, a comprehensive time-varying reliability calculation module, and an evaluation and judgment module. The present invention can efficiently and intelligently calculate the reliability of components of transmission line towers under different wind-ice coupling effects and corrosion environments, providing strong digital support for power grid design.

Description

Technical Field

[0001] The present invention relates to the technical field of digital power grids, and in particular to a wind-ice coupled corrosion reliability assessment method and system applied to digital power grids. Background Art

[0002] In the operation of the power grid, the transmission tower is the backbone of power transmission, and its reliability is directly related to the safety and stability of the entire power grid system. However, in the face of the complex and changeable wind-ice coupling effect, the corrosion reliability assessment of the transmission tower has always lacked accurate digital means, which has become a major bottleneck restricting the design of the power grid.

[0003] The double impact of wind load and ice load makes it difficult to quantify the corrosion reliability of transmission tower components, which in turn affects the reliability assessment of the tower and poses a potential threat to the security of the power grid system. This problem not only limits the durability and sustainable development of the power grid structure, but also hinders the pace of the power grid's transformation to digitalization and intelligence.

[0004] Therefore, there is an urgent need for a method that can efficiently and intelligently calculate the component reliability of transmission line towers under different wind-ice coupling effects and corrosion environments to provide strong digital support for power grid design. Summary of the invention

[0005] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art.

[0006] To this end, a first aspect of the present invention provides a wind-ice coupled corrosion reliability assessment method applied to a digital power grid.

[0007] A second aspect of the present invention provides a wind-ice coupled corrosion reliability assessment system applied to a digital power grid.

[0008] The present invention provides a wind-ice coupled corrosion reliability assessment method applied to a digital power grid, comprising:

[0009] Acquire transmission tower foundation parameter information; the foundation parameter information includes corrosion parameter information, design parameter information and material specification information;

[0010] Calculate the wind-ice coupling effect ratio of the transmission tower under different ice thickness and different design wind speeds;

[0011] Determine the corrosion environment impact coefficient according to the atmospheric corrosion environment level of the transmission tower;

[0012] Based on the wind-ice coupling effect ratio, a reliability simulation calculation of the transmission tower component under the current operating time is performed to obtain the simulated reliability of the transmission tower component under each wind-ice coupling effect ratio;

[0013] The comprehensive time-varying reliability of the transmission tower components is calculated according to the simulated reliability and the corrosion environment influence coefficient; and the reliability of the transmission tower is evaluated according to the comprehensive time-varying reliability to determine whether repair and reinforcement are needed.

[0014] The wind-ice coupled corrosion reliability assessment method applied to a digital power grid according to the above technical solution of the present invention may also have the following additional technical features:

[0015] In the above technical solution, the corrosion parameter information includes at least the atmospheric corrosion environment level of the environment where the transmission tower is located;

[0016] The design parameter information includes at least the design wind speed of the transmission tower;

[0017] The material specification information includes at least transmission tower component specifications and / or component ice coating thickness.

[0018] In the above technical solution, the calculation of the wind-ice coupling effect ratio of the transmission tower under different ice coating thicknesses and different design wind speeds includes:

[0019]

[0020] in, represents the wind-ice coupling effect ratio; Indicates the design wind speed of the environment where the transmission tower is located; Indicates the ice thickness of the environment where the transmission tower is located.

[0021] In the above technical solution, the atmospheric corrosion environment grades include C1 grade, C2 grade, C3 grade, C4 grade and C5 grade divided according to ISO 9223 standard;

[0022] The higher the atmospheric corrosion environment level, the smaller the value of the corrosion environment impact coefficient.

[0023] In the above technical solution, when the atmospheric corrosion environment level of the transmission tower is C1, the corrosion environment impact coefficient ;

[0024] When the atmospheric corrosion environment level of the transmission tower is C2, the corrosion environment impact coefficient ;

[0025] When the atmospheric corrosion environment level of the transmission tower is C3, the corrosion environment impact coefficient ;

[0026] When the atmospheric corrosion environment level of the transmission tower is C4, the corrosion environment impact coefficient ;

[0027] When the atmospheric corrosion environment level of the transmission tower is C5, the corrosion environment impact coefficient .

[0028] In the above technical solution, the reliability simulation calculation of the transmission tower component under the current operating time based on the wind-ice coupling effect ratio is performed to obtain the simulated reliability of the transmission tower component under each wind-ice coupling effect ratio, including:

[0029]

[0030] in, Represents the simulated reliability of the transmission tower when the operating time is t.

[0031] In the above technical solution, the comprehensive time-varying reliability of the transmission tower component is calculated according to the simulated reliability and the corrosion environment influence coefficient, including:

[0032]

[0033] in, represents the comprehensive time-varying reliability; Represents the corrosion environment influence coefficient.

[0034] In the above technical solution, the reliability of the transmission tower is evaluated according to the comprehensive time-varying reliability to determine whether it needs to be repaired and reinforced, including:

[0035] comparing the integrated time-varying reliability with a set threshold;

[0036] When the comprehensive time-varying reliability is greater than or equal to the set threshold, it means that the reliability of the transmission tower meets the requirements and no repair or reinforcement is required;

[0037] When the comprehensive time-varying reliability is less than the set threshold, it means that the reliability of the transmission tower does not meet the requirements and needs to be repaired and reinforced.

[0038] The present invention provides a wind-ice coupling corrosion reliability assessment system for digital power grid, which is applied to the wind-ice coupling corrosion reliability assessment method as described in any one of the above technical solutions. The system includes:

[0039] Basic database, used to store basic parameter information of transmission towers;

[0040] The comprehensive time-varying reliability calculation module is connected to the basic database, and calls the wind-ice coupling effect ratio calculation criterion and the comprehensive time-varying reliability calculation criterion according to the data in the basic database to perform reliability simulation calculation, and calculates the wind-ice coupling effect ratio, the corrosion environment influence coefficient and the comprehensive time-varying reliability;

[0041] The evaluation and judgment module evaluates the reliability of the transmission tower according to the comprehensive time-varying reliability, determines whether it needs to be repaired and reinforced, and outputs the judgment result.

[0042] The wind-ice coupled corrosion reliability assessment system applied to a digital power grid according to the above technical solution of the present invention may also have the following additional technical features:

[0043] The above technical solution also includes:

[0044] The display module is connected to the evaluation and judgment module and is used to visually display the judgment results.

[0045] In summary, due to the adoption of the above technical features, the beneficial effects of the present invention are:

[0046] The present invention proposes a wind-ice coupling corrosion reliability assessment method and system for digital power grids, which is tailor-made for digital power grids. The disclosed method can efficiently and intelligently calculate the reliability of transmission line tower components under different wind-ice coupling effects and corrosion environments, providing strong digital support for power grid design.

[0047] Specifically, in the present disclosure, full consideration is given to the influence of different design wind speeds and different ice thicknesses, that is, the influence degree on the transmission tower under different wind-ice coupling effects, and the comprehensive time-varying reliability is obtained by combining the influence coefficient determined according to the atmospheric corrosion environment level to quantitatively evaluate the reliability of the transmission tower. The calculation method is in line with the actual engineering needs, the calculation results are reliable and accurate, and the operating status of the transmission tower can be scientifically and effectively evaluated or predicted, thereby providing a basis for the transformation of the line project and ensuring the safe and stable operation of the transmission network.

[0048] 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

[0049] 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:

[0050] Figure 1 It is a flow chart of a wind-ice coupled corrosion reliability assessment method applied to a digital power grid according to an embodiment of the present invention;

[0051] Figure 2 It is a schematic diagram of the operation of a wind-ice coupled corrosion reliability assessment system applied to a digital power grid according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] Refer to the following Figure 1 and Figure 2 The following describes a wind-ice coupled corrosion reliability assessment method and system for a digital power grid provided according to some embodiments of the present invention.

[0055] Some embodiments of the present application provide a wind-ice coupled corrosion reliability assessment method applied to a digital power grid.

[0056] like Figure 1 As shown, the first embodiment of the present invention proposes a wind-ice coupled corrosion reliability assessment method for a digital power grid, including steps S1-S5. It should be noted that the order of steps S1-S5 referred to in the present disclosure is only for 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.

[0057] S1. Obtain basic parameter information of a transmission tower; the basic parameter information includes corrosion parameter information, design parameter information and material specification information; specifically, the corrosion parameter information includes at least the atmospheric corrosion environment level of the environment where the transmission tower is located; the design parameter information includes at least the design wind speed of the transmission tower; the material specification information includes at least the specifications of transmission tower components and / or the thickness of ice coating on the components.

[0058] In a specific embodiment, the basic parameter information mainly includes basic parameters such as the design wind speed of the transmission tower, ice thickness, atmospheric corrosion environment level, galvanized layer corrosion rate, and component specifications.

[0059] It should be noted that the basic parameter information collected in step S1 should at least include the necessary data required for the subsequent comprehensive time-varying reliability calculation, which can be uncalculated collected data or result data obtained from other calculation statistics. For example, the necessary ice thickness data can be directly obtained in real time from the existing environmental monitoring statistical system, or the ice thickness can be calculated and predicted using existing methods based on the transmission tower component specifications, area, ambient temperature, ice shape coefficient, measured or investigated ice density and other data.

[0060] S2. Calculate the wind-ice coupling effect ratio of the transmission tower under different ice thicknesses and different design wind speeds.

[0061] In some embodiments, the calculation method of step S2 includes:

[0062]

[0063] in, represents the wind-ice coupling effect ratio; Indicates the design wind speed of the environment where the transmission tower is located; Indicates the ice thickness of the environment where the transmission tower is located.

[0064] The design wind speed of the environment where the transmission tower is located refers to the calculated wind speed selected for various design conditions of the line according to the meteorological data along the line and the operating experience of the existing lines nearby, according to the specified recurrence period. The selection of the design wind speed is crucial to the design of the transmission line because it directly affects the safety and economy of the line.

[0065] It is understandable that in step S2, the design wind speed and ice thickness do not have to be calculated according to the actual values. The wind-ice coupling effect ratio under different conditions can also be calculated by selecting values, so as to include the different data faced when the transmission tower environment changes as much as possible into the scope of evaluation consideration. In a specific embodiment, the design wind speed of the environment where the transmission tower is located includes 25m / s, 26m / s, 27m / s, 28m / s, 29m / s, 30m / s, 31m / s, 32m / s, 33m / s, 34m / s, 35m / s, 36m / s, 37m / s, etc.; the ice thickness of the environment where the transmission tower is located includes 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 40mm, 50mm, 60mm, etc. In the above selected values, any combination of design wind speed and ice thickness corresponds to a wind-ice coupling effect ratio.

[0066] S3. Determine the corrosion environment impact coefficient based on the atmospheric corrosion environment level of the environment where the transmission tower is located.

[0067] In some embodiments, the atmospheric corrosion environment grades include C1 grade, C2 grade, C3 grade, C4 grade and C5 grade divided according to ISO 9223 standard.

[0068] ISO 9223 is an international standard related to metal corrosion. C1, C2, C3, C4 and C5 are all clearly distinguished atmospheric corrosivity levels in this standard. The specific classification is as follows:

[0069] C1 atmospheric corrosivity refers to a dry, pollution-free atmospheric environment where the corrosion rate of metal materials is very slow and generally does not cause significant corrosion damage to metal materials. This environment generally only exists in special occasions such as laboratories.

[0070] C2 atmospheric corrosivity level means that in slightly polluted atmospheric environments such as cities and industrial areas, the corrosion rate of metal materials is relatively slow, but metal materials will still suffer a certain degree of corrosion damage after long-term exposure to such environments. In such environments, metal materials need to be regularly maintained and serviced.

[0071] C3 atmospheric corrosivity refers to the rapid corrosion rate of metal materials in moderately polluted atmospheric environments such as coastal areas and urban industrial areas, and the metal materials will suffer significant corrosion damage. In this environment, metal materials need to take some measures, such as coating and anti-corrosion treatment, to extend their service life.

[0072] C4 atmospheric corrosivity refers to the fact that in seriously polluted atmospheric environments such as oceans and chemical plants, the corrosion rate of metal materials is very fast and the metal materials will suffer serious corrosion damage. In this environment, metal materials need to take high-intensity anti-corrosion measures, such as using stainless steel, galvanized and other materials.

[0073] C5 atmospheric corrosivity refers to the extremely polluted atmospheric environment such as chemical plants and offshore oil platforms, where the corrosion rate of metal materials is very fast and metal materials will suffer extremely serious corrosion damage. In this environment, metal materials need to take the strongest anti-corrosion measures, such as using special alloy materials and electrophoretic coatings.

[0074] The ISO 9223 standard also divides CX grades, but they are of little significance to the reliability assessment of wind-ice coupled corrosion in this disclosure and are not analyzed in this disclosure.

[0075] It should be noted that in the embodiment of the present disclosure, step S3 is a process of assigning values, and the specific value of the corrosion environment impact coefficient is the most representative result obtained by the present disclosure after a large amount of data analysis. Those skilled in the art can use the following approximate values ​​of the specific values ​​for assignment to obtain approximate results. However, the principle that must be met is: the higher the level of the atmospheric corrosion environment, the smaller the value of the corrosion environment impact coefficient.

[0076] In a specific embodiment, when the atmospheric corrosion environment level of the transmission tower is C1, the corrosion environment impact coefficient ;

[0077] When the atmospheric corrosion environment level of the transmission tower is C2, the corrosion environment impact coefficient ;

[0078] When the atmospheric corrosion environment level of the transmission tower is C3, the corrosion environment impact coefficient ;

[0079] When the atmospheric corrosion environment level of the transmission tower is C4, the corrosion environment impact coefficient ;

[0080] When the atmospheric corrosion environment level of the transmission tower is C5, the corrosion environment impact coefficient .

[0081] S4. Based on the wind-ice coupling effect ratio, reliability simulation calculation of the transmission tower component under the current operating duration is performed to obtain the simulated reliability of the transmission tower component under each wind-ice coupling effect ratio.

[0082] In some embodiments, step S4 includes:

[0083]

[0084] in, It represents the simulated reliability of the transmission tower when the operating time is t, and the unit of t is year.

[0085] S5. Calculate the comprehensive time-varying reliability of the transmission tower components according to the simulated reliability and the corrosion environment influence coefficient; and evaluate the reliability of the transmission tower according to the comprehensive time-varying reliability to determine whether repair and reinforcement are needed.

[0086] In some embodiments, the calculating the comprehensive time-varying reliability of the transmission tower component according to the simulated reliability and the corrosion environment impact coefficient includes:

[0087]

[0088] in, represents the comprehensive time-varying reliability; Represents the corrosion environment influence coefficient.

[0089] In some embodiments, evaluating the reliability of the transmission tower according to the comprehensive time-varying reliability to determine whether repair and reinforcement are needed includes:

[0090] The comprehensive time-varying reliability is compared with the set threshold; when the comprehensive time-varying reliability is greater than or equal to the set threshold, it means that the reliability of the transmission tower meets the requirements and no repair or reinforcement is required; when the comprehensive time-varying reliability is less than the set threshold, it means that the reliability of the transmission tower does not meet the requirements and needs repair or reinforcement.

[0091] In a specific embodiment, the above-mentioned threshold is set to 2.9.

[0092] Some other embodiments of the present invention provide a wind-ice coupling corrosion reliability assessment system applied to a digital power grid, which is applied to the wind-ice coupling corrosion reliability assessment method as described in any of the above embodiments. The system at least includes a basic database, a comprehensive time-varying reliability calculation module and an assessment and judgment module.

[0093] The basic database is used to store the basic parameter information of the transmission tower; Figure 2 As shown, the basic database is divided into a corrosion parameter library, a design parameter library and a material specification library according to the data type to store corrosion parameter information, design parameter information and material specification information respectively. In a specific embodiment, the basic parameter information is imported into the three databases in .xls or .xlsx format.

[0094] The comprehensive time-varying reliability calculation module is connected to the basic database, and calls the wind-ice coupling effect ratio calculation criterion and the comprehensive time-varying reliability calculation criterion according to the data in the basic database to perform reliability simulation calculation, and calculates the wind-ice coupling effect ratio, the corrosion environment influence coefficient and the comprehensive time-varying reliability. It should be noted that the wind-ice coupling effect ratio calculation criterion and the comprehensive time-varying reliability calculation criterion are the calculation methods recorded in S2-S5 in the above embodiments, and these calculation methods can be set in the core algorithm library and applied by calling.

[0095] The evaluation and judgment module evaluates the reliability of the transmission tower according to the comprehensive time-varying reliability, determines whether it needs to be repaired and reinforced, and outputs the judgment result.

[0096] In some embodiments, the system further includes a display module and a data output terminal, wherein the display module is connected to the evaluation and judgment module for visually displaying the judgment results.

[0097] exist Figure 2 In the embodiment shown, the evaluation and judgment module and the display module are integrated as a visual interface. The comprehensive time-varying reliability calculation module outputs the comprehensive time-varying reliability calculation result to the visual interface in the form of a data stream. Based on the reliability calculation result, the visual interface performs evaluation and judgment. When it is not less than 2.9, it is evaluated as "reliability meets the requirements" and displayed as "green"; when the comprehensive time-varying reliability When it is less than 2.9, it is assessed as “insufficient reliability and should be repaired and reinforced in time” and displayed as “red”.

[0098] After obtaining the reliability prediction results and evaluation suggestions, the visualization interface outputs the data stream to the data output terminal. After the data output terminal passes the four-level online review process of owner design, verification, review, and approval, it forms a transmission tower wind-ice coupled corrosion reliability prediction and evaluation report in .PDF file format, and then forms a finished document for easy engineering use.

[0099] 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.

[0100] 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 wind-ice coupled corrosion reliability assessment method for digital power grid, characterized in that: include: Get the basic parameter information of the transmission tower; The basic parameter information includes corrosion parameter information, design parameter information and material specification information; Calculate the wind-ice coupling effect ratio of the transmission tower under different ice thickness and different design wind speeds; Determine the corrosion environment impact coefficient according to the atmospheric corrosion environment level of the transmission tower; Based on the wind-ice coupling effect ratio, a reliability simulation calculation of the transmission tower component under the current operating time is performed to obtain the simulated reliability of the transmission tower component under each wind-ice coupling effect ratio; Calculating the comprehensive time-varying reliability of the transmission tower components according to the simulated reliability and the corrosion environment influence coefficient; and evaluating the reliability of the transmission tower according to the comprehensive time-varying reliability to determine whether repair and reinforcement are required; The corrosion parameter information at least includes the atmospheric corrosion environment level of the environment where the transmission tower is located; The design parameter information includes at least the design wind speed of the transmission tower; The material specification information includes at least the specifications of the transmission tower components and / or the ice coating thickness of the components; The calculation of the wind-ice coupling effect ratio of the transmission tower under different ice coating thicknesses and different design wind speeds includes: in, represents the wind-ice coupling effect ratio; Indicates the design wind speed of the environment where the transmission tower is located; Indicates the ice thickness of the environment where the transmission tower is located; The atmospheric corrosion environment grades include C1, C2, C3, C4 and C5 grades divided according to ISO 9223 standard; The higher the atmospheric corrosion environment level, the smaller the value of the corrosion environment impact coefficient.

2. The wind-ice coupled corrosion reliability assessment method for digital power grid according to claim 1 is characterized in that: When the atmospheric corrosion environment level of the transmission tower is C1, the corrosion environment impact coefficient ; When the atmospheric corrosion environment level of the transmission tower is C2, the corrosion environment impact coefficient ; When the atmospheric corrosion environment level of the transmission tower is C3, the corrosion environment impact coefficient ; When the atmospheric corrosion environment level of the transmission tower is C4, the corrosion environment impact coefficient ; When the atmospheric corrosion environment level of the transmission tower is C5, the corrosion environment impact coefficient .

3. The wind-ice coupled corrosion reliability assessment method for digital power grid according to claim 1 is characterized in that: The reliability simulation calculation of the transmission tower component under the current operation duration based on the wind-ice coupling effect ratio is performed to obtain the simulated reliability of the transmission tower component under each wind-ice coupling effect ratio, including: in, Represents the simulated reliability of the transmission tower when the operating time is t.

4. The wind-ice coupled corrosion reliability assessment method for digital power grid according to claim 3 is characterized in that: The calculating the comprehensive time-varying reliability of the transmission tower component according to the simulated reliability and the corrosion environment influence coefficient comprises: in, represents the comprehensive time-varying reliability; Represents the corrosion environment influence coefficient.

5. The wind-ice coupled corrosion reliability assessment method for digital power grid according to claim 1 is characterized in that: The reliability of the transmission tower is evaluated according to the comprehensive time-varying reliability to determine whether repair and reinforcement are required, including: comparing the integrated time-varying reliability with a set threshold; When the comprehensive time-varying reliability is greater than or equal to the set threshold, it means that the reliability of the transmission tower meets the requirements and no repair or reinforcement is required; When the comprehensive time-varying reliability is less than the set threshold, it means that the reliability of the transmission tower does not meet the requirements and needs to be repaired and reinforced.

6. A wind-ice coupled corrosion reliability assessment system applied to digital power grid, characterized in that: The wind-ice coupled corrosion reliability assessment method according to any one of claims 1 to 5, wherein the system comprises: Basic database, used to store basic parameter information of transmission towers; The comprehensive time-varying reliability calculation module is connected to the basic database, and calls the wind-ice coupling effect ratio calculation criterion and the comprehensive time-varying reliability calculation criterion according to the data in the basic database to perform reliability simulation calculation, and calculates the wind-ice coupling effect ratio, the corrosion environment influence coefficient and the comprehensive time-varying reliability; The evaluation and judgment module evaluates the reliability of the transmission tower according to the comprehensive time-varying reliability, determines whether it needs to be repaired and reinforced, and outputs the judgment result.

7. The wind-ice coupling corrosion reliability assessment system for digital power grid according to claim 6 is characterized in that: Also includes: The display module is connected to the evaluation and judgment module and is used to visually display the judgment results.

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