Hydropower engineering grounding aided design system

Abstract

The invention provides a hydroelectric engineering grounding aided design system. The system comprises an engineering grounding model reading module, a power station grounding design preliminary scheme generation module, a detailed grounding scheme generation module of each engineering area, a grounding design result generation module and a grounding calculation data database which are in data connection. According to the method, data such as a design scheme, report materials and statistical data can be quickly generated, and the efficiency of processes such as scheme design and adjustment, budget quotation in engineering, report writing and detailed drawing design is greatly improved; compared with a traditional design method, the point-by-point grounding calculation method can provide more reliable and accurate grounding safety guarantee calculation data, and a more accurate and reliable grounding design scheme is obtained.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering intelligent auxiliary design, and in particular relates to a hydropower engineering grounding auxiliary design system. Background Art

[0002] In recent years, as green, low-carbon, and environmentally friendly economic development has required adjustments to my country's energy structure, the number of hydropower projects has continued to increase, and their scale has also increased accordingly. Consequently, the requirements for design efficiency and project costs in all aspects of hydropower projects are also increasing. Grounding engineering is an important part of hydropower station safety assurance, and the safety of the grounding system must be effectively guaranteed. At the same time, hydropower station grounding engineering involves a large amount of metal materials such as copper and steel, and their material selection and layout will affect the economic indicators of the hydropower station's electrical design. Therefore, the industry urgently needs a new design method that uses digital means to reduce project costs and find the optimal solution for the design while ensuring the safety and reliability of the grounding system design. At the same time, digital means can be used to reduce design difficulty and time costs, efficiently complete grounding design plans and detailed layouts, and improve overall work efficiency. Summary of the Invention

[0003] In view of the defects of the prior art, the present invention provides a hydropower project grounding auxiliary design system, which can effectively solve the above problems.

[0004] The technical solution adopted by the present invention is as follows: a hydropower project grounding auxiliary design system, including a data-connected engineering grounding model reading module, a power station grounding design preliminary plan generation module, a detailed grounding plan generation module for each project area, a grounding design results generation module, and a grounding calculation data database;

[0005] The engineering grounding model reading module includes a power station geographic model scanning device, an engineering model import and integration submodule, a resistivity intelligent identification submodule, and a power station model data analysis submodule; it is used to obtain the geographic model of the actual area of ​​the hydropower project and simultaneously identify data information related to the grounding design, and import the identified and marked engineering model into the power station grounding design preliminary plan generation module;

[0006] The power station grounding design preliminary scheme generation module includes a full-station grounding overall scheme analysis submodule, a full-station grounding preliminary scheme generation submodule, and a full-station grounding overall scheme weighted calibration submodule; the generation and calibration of the hydropower project power station overall grounding preliminary scheme are completed by using the grounding design scheme generation algorithm, various supporting application functions and data information;

[0007] The detailed grounding scheme generation module for each project area includes a regional grounding grid model generation and adjustment submodule, a regional detailed grounding scheme generation submodule, and a regional detailed grounding design scheme weighted calibration submodule. The module uses the grounding design scheme generation algorithm and various supporting application modules and data to gradually adjust and calibrate the grounding scheme and layout, ultimately generating a detailed grounding design scheme for each project area and a three-dimensional grounding body layout model.

[0008] The grounding calculation data database stores data required for various grounding arrangements and calculations, including electrical and price data for various grounding materials, including soil and river water resistivity under various conditions, geographical electrical parameters of lightning strike frequency at various regions and altitudes, various index parameters and restrictive parameters required for grounding design in hydropower specifications, various shapes and electrical parameter curves of grounding grids, grounding parameter index requirements for various types of electrical equipment, and reference values ​​of weight coefficient groups preset for various scales and regions of projects. It is used to provide data support for the project grounding model reading module, the power station grounding design preliminary plan generation module, and the detailed grounding plan generation module for each project area.

[0009] The grounding design results generation module includes a grounding calculation report generation module, a regional grounding body layout diagram generation module, and a grounding material statistics table generation module, which is used to organize and count the grounding design schemes and models generated by each module to form various results files.

[0010] Furthermore, the power station geographic model scanning device is a surveying and mapping drone equipped with multiple high-definition oblique cameras, which is used to scan the power station project area and obtain a high-precision engineering geographic information model, providing a model basis for the analysis and calculation in the power station grounding design preliminary plan generation module and the detailed grounding plan generation module for each project area;

[0011] The engineering model import and integration submodule is used to import the scanned power station area geographic information model and the engineering BIM design models of hydraulic structures, building structures, electromechanical and metal structure equipment into the power station grounding design preliminary plan generation module, and coordinately integrate the various professional models to form a complete set of hydropower engineering power station BIM models, and each professional model must contain corresponding standard BIM model information;

[0012] The resistivity intelligent identification submodule is used to intelligently identify the power station geographic images and model information obtained by oblique photography to analyze and determine the soil and river water resistivity of each area of ​​the power station, and assign relevant attribute data to the geographic model of the corresponding range area. This provides the necessary data support for the design scheme generation module of the power station grounding design preliminary scheme and the detailed grounding scheme generation module for each project area.

[0013] The power station model data analysis submodule is used to organize and identify data of the engineering BIM model of the entire station, divide the engineering model into regions according to design and construction habits and engineering progress management requirements, and automatically measure and add model attributes to various types of data in each engineering area that may have an electrical impact on the subsequent grounding design plan, providing the required data support for the design plan generation module of the power station grounding design preliminary plan and the detailed grounding plan generation module of each engineering area.

[0014] Furthermore, the submodule for analyzing the overall grounding scheme of the entire station uses the BIM model data and the data of the short-circuit current calculation parameters of the entire station and related algorithms to analyze, calculate and preliminarily organize the grounding calculation data of the entire power station. Through calculation and organization, the design requirements of the total grounding resistance value of the power station, the grounding design weighted coefficient group of each area, the shielding coefficient between the grounding grids of each area, the available grounding grid area of ​​each area, the grounding environmental conditions of each area, and the grounding design restrictions and special index requirements of each area are obtained as supporting data required for further scheme generation by the detailed grounding scheme generation module of each project area.

[0015] The submodule for generating a preliminary plan for grounding the entire station will call the preliminary plan generation algorithm to complete the generation of the preliminary plan for grounding the entire station, provide a visual working interface and interactive functions for the algorithm, and interact with the designer in accordance with the algorithm sequence to complete the input, reading, confirmation, and result judgment operations of the design data of each step, generate a preliminary plan for grounding the entire station, and provide a corresponding interface to view the calculation method and data results of each design step;

[0016] The weighted calibration submodule of the overall grounding scheme for the entire station includes a method for modifying and adjusting the weighted coefficient of the grounding design for the entire station, defines and constrains the design scheme characteristics with electrical, economic and durability indicators, and calls the preliminary grounding scheme generation algorithm to complete the automatic calibration and adjustment modification of the preliminary grounding scheme for the entire station until the optimal preliminary design scheme is obtained; at the same time, a visual working interface is provided for the algorithm, and the weighted coefficient adjustment of the preliminary scheme is completed according to the algorithm, and the impact of each adjustment scheme on the design indicators is displayed in the interface.

[0017] Furthermore, the regional grounding grid model generation and adjustment submodule generates a power station grounding body model in a three-dimensional model environment according to the grounding design scheme calculated in each step, and adjusts and compiles statistics on the layout of each grounding body and grounding auxiliary materials in the model according to actual conditions and subsequent adjustment commands;

[0018] The detailed grounding scheme generation submodule for each project area will call the regional detailed grounding scheme generation algorithm to complete the generation of detailed grounding design schemes for each project area of ​​the power station, provide an interface and function to view the generated grounding body model in a three-dimensional model environment, and complete related grounding calculations to generate detailed grounding design schemes for each area. It also provides an interface for designers to interact and view the calculation methods and results of each step.

[0019] The weighted calibration submodule of the regional detailed grounding design scheme will call the regional detailed grounding design scheme generation algorithm, and adjust each sub-region of the grounding grid of each engineering part section by section, and at the same time further automatically adjust the weighting coefficient at the decimal level to obtain the optimal design scheme; complete the calibration and generation of the detailed grounding design scheme of the entire site, provide a visual working interface for the algorithm, view and adjust in the interface, and finally confirm the detailed grounding scheme of each area and generate a three-dimensional model.

[0020] Furthermore, the preliminary grounding scheme generation submodule and the detailed grounding scheme generation submodule for each engineering area include sub-algorithms for calculating, arranging, verifying, adjusting and judging the grounding scheme using the BIM model and its ancillary information, and a combination of calculation methods and application functions is performed according to the needs of the design process; the algorithm steps are as follows: first, in the preliminary grounding scheme generation algorithm, the recognition function of the BIM model and the grounding design index calculation formula are used to complete the calculation and generation of the preliminary grounding scheme of the entire station and various basic design index parameters; then, in the detailed grounding scheme generation algorithm for each engineering area, the grounding grid sub-area of ​​each engineering part is further calculated section by section to select the design materials and schemes, and the results are obtained. Verify various design indicators to obtain detailed and reasonable grounding plans for each project area. In the above process, the grounding design plan adjustment priority coefficients of the project area and its sub-areas are set to optimize the sorting. When optimizing the plan, the weighted coefficients of each indicator are adjusted to constrain and judge the optimization method of the refined grounding network selection plan for the project area and its sub-areas, and finally obtain the design plan with the best safety and cost factors. Specifically, it includes setting weighted coefficients for three indicators: electrical performance, economy, and durability. The weighted coefficients are used to define and constrain the grounding design plan. The grounding design plan is automatically adjusted by adjusting the proportion of the weighted coefficients of each indicator step by step until the optimal design plan is obtained.

[0021] The economic weighted coefficient formula is:

[0022]

[0023] Where K1 is the weight ratio adjustment coefficient, K ai K is the price coefficient of the grounding material used in each project area in the preliminary plan. bi A is the price coefficient of the grounding construction technology and supporting parts used in each project area in the preliminary plan. iis the amount of grounding grid material used in each area in the preliminary plan, k' Ei Detailed economic adjustment coefficients for each region after the design plan;

[0024] The electrical weighting coefficient formula is:

[0025]

[0026] Where i is the project area number, K2 is the weight ratio adjustment coefficient, R req is the required value of the total grounding grid resistance of the power station, R total is the calculated value of the power station's main grounding grid, K ai K is the electrical performance coefficient of the grounding material in the preliminary plan of each project area. bi is the adjustment coefficient of grounding resistance reduction measures in the preliminary plan for each project area, R i is the impedance calculation value of each project area, K ci is the regional safety level coefficient, k' Fi Adjustment coefficient of electrical performance after detailed design of scheme for each area;

[0027] The durability weighted coefficient formula is:

[0028]

[0029] Where K3 is the weight ratio adjustment coefficient, K ai is the durability coefficient of the grounding material in each project area, B i is the corrosion degree coefficient of each engineering area, k' Li Durability adjustment factor after detailed design plan for each area;

[0030] The adjustment priority coefficients for the grounding design schemes in each project area are:

[0031]

[0032] Where i is the project area number, S i is the laying area of ​​the grounding network of each project, V ai is the average area price of grounding materials in each project area, V bi is the average area price of grounding technology and supporting equipment, K s is the regional safety requirement level, P s is the probability of regional electrical accidents;

[0033] Adjustment priority coefficients for design schemes of each sub-area of ​​the grounding grid at each project site:

[0034]

[0035] Where, zi is the sub-area number of the grounding grid in a certain project area, Szi is the area of ​​the grounding grid; V azi is the average area price of grounding materials in each grounding grid area, V bzi K is the average area price of grounding technology and supporting equipment in each grounding grid resistance area; zi n is the safety requirement level coefficient of grounding equipment in each grounding grid sub-area; zi The number of grounding equipment required in each grounding grid area; d zi It is the minimum distance between the main grounding body and the grounding equipment in each grounding grid area.

[0036] Furthermore, the grounding preliminary plan generation submodule is specifically used to:

[0037] S1. Read or input the maximum short-circuit current value flowing through the grounded neutral point of the power plant and substation when the maximum single-phase ground short circuit occurs in the power station from the electrical design pre-process;

[0038] S2. Calculate the required resistance value of the total grounding grid of the power station based on the basic electrical parameters of the power station provided in S1;

[0039] S3. Call each submodule in the engineering grounding model reading module to identify and mark the engineering BIM model, and import the model into the power station grounding design preliminary plan generation module program;

[0040] S4, reading the resistivity data of each project area from the BIM model attached information imported in step S3;

[0041] S5. Read various spatial data from the BIM model attached information imported in step S3, and calculate various grounding system spatial parameters in each area, including the effective grounding grid area, the equivalent dimensions of the natural grounding grid, and the shielding coefficient between regional grounding grids;

[0042] S6. Read the preset weighted coefficient groups for the entire station and each project area from the grounding calculation data database. The algorithm will perform a preliminary grounding design solution calculation based on the proportion of each coefficient in the weighted array, such that the configured solution matches the adjustment coefficients of each indicator. When the return adjustment command of step S10 is received, the weight values ​​will be adjusted step by step as needed to find the optimal design solution.

[0043] S7. Input or adjust the regional resistance reduction measures adjustment coefficient according to the situation of each region;

[0044] S8. Automatically calculate the resistance value of the preliminary design of the grounding grid for each area of ​​the power station using the calculation formulas for various hydropower project indicators built into the algorithm, the various parameters calculated in steps S4 and S5, the grounding scheme configuration results in step S6, and various common grounding calculation parameters stored in the grounding calculation data database;

[0045] S9. Using the shielding coefficient between regional grounding grids and the corresponding calculation formula, perform parallel calculation of the regional grounding grids of the entire station obtained in step S8 to obtain the calculated value of the preliminary design of the power station's total grounding grid;

[0046] S10. Compare the required resistance value of the total grounding grid of the power station calculated in step S2 with the calculated value of the preliminary design scheme of the entire station grounding system obtained in step S9. If the total resistance value of the preliminary design scheme is greater than the required resistance value of the total grounding grid of the power station, it is considered not in compliance, and the algorithm automatically returns to step S6 to modify the weighted array, and gradually increase the proportion of the weighted coefficient of the electrical index by region to regenerate the scheme; if the total resistance value of the preliminary design scheme is less than the required resistance value of the total grounding grid of the power station, it is considered in compliance, but if the proportion of the economic weighted coefficient is lower than a certain index, the algorithm will be deemed to need adjustment and automatically return to step S6 to modify the weighted array to optimize the grounding design scheme, and gradually increase the proportion of the economic index weighted coefficient by region until the optimal grounding design scheme is obtained and confirmed, and then continue to step S11;

[0047] S11. Generate a preliminary design plan for the entire station grounding based on the calculation and adjustment results, organize relevant result data, and end the algorithm process for generating the preliminary plan for the entire station grounding.

[0048] Furthermore, the detailed grounding plan generation submodule for each project area is specifically used to

[0049] S1. Read the preliminary grounding plan and parameters for the entire station provided by the preliminary grounding design plan generation module of the power station, and generate three-dimensional models of the main grounding body, branch grounding body, and various auxiliary grounding materials in each area in the three-dimensional BIM model. At the same time, when the adjustment commands of the following steps S4, S5, S6, and S7 are received, the type and layout of the generated model will be adjusted according to the modification of the weighting coefficient;

[0050] S2. Divide the grounding grid model within each project area into sub-areas. Based on the preliminary grounding layout plan within each sub-area in step S1, calculate the grounding impedance value of each sub-area section by section from the edge of the grounding grid, and obtain the detailed calculated electrical impedance value of the grounding grid as a whole in the project area.

[0051] S3. The algorithm recommends and presets the standard solutions for the corresponding scale and region stored in the grounding calculation data database based on the characteristics of each region. It selects and confirms the auxiliary grounding resistance reduction measures that can be taken, generates the layout plan for this region in the 3D model based on the corresponding measure plan data, and adjusts the calculated grounding impedance values ​​of each sub-region based on step S2.

[0052] S4. The algorithm compares and determines whether the impedance values ​​of the grounding grids in each area obtained after adjustment in step S3 meet the required grounding impedance values ​​of each area in the preliminary plan for the entire station grounding. If the impedance values ​​exceed the required values, the algorithm is deemed to be non-compliant and automatically returns to step S1 to modify the grounding material selection, detailed layout plan, resistance reduction measures parameters, and plan details in the area. If the impedance values ​​are lower than the required values, the algorithm is deemed to be compliant and proceeds to step S5.

[0053] S5. Verify various potential index parameters based on the electrical parameters corresponding to the current regional grounding design scheme and the model layout in the three-dimensional environment provided in step S4. If any verification calculation does not meet the verification conditions, it is considered non-compliant, and the process automatically returns to step S1 to modify the grounding material selection, detailed layout plan, resistance reduction measure parameters, and plan details in the region. If all verification calculations meet the requirements, it is considered compliant, and the process proceeds to step S6.

[0054] S6. Calling the grounding calculation data database, based on the grounding design specifications for the corresponding project parts, determines the implementation details of the grounding arrangement in each area adjusted in steps S4 and S5, and verifies whether the various electrical indicators meet the requirements. If not, the process automatically returns to step S1 to modify the relevant parameters in the design scheme step by step. If it meets the requirements, the process proceeds to step S7.

[0055] S7. Based on the modified regional grounding plan in steps S4, S5, and S6, adjust the weighted coefficients of each indicator, and determine whether the weighted ratios of the electrical, economic, and durability coefficients are within the limits of the preliminary design plan, and whether each weighted coefficient meets the requirements of the relevant limiting conditions. If not, it is considered non-compliant, and the weighted coefficients are gradually modified and the process returns to step S1 to modify the regional grounding grid design plan step by step. If each weighted coefficient meets the requirements of the preliminary design plan and the relevant limiting conditions, it is considered compliant, and the process proceeds to step S8.

[0056] S8. Generate a detailed grounding plan for each area based on the adjustment and calculation results of the above steps, generate a three-dimensional model of the grounding design, and end the algorithm process for generating the detailed grounding plan for each project area.

[0057] Beneficial effects of the present invention: The present invention provides a new set of auxiliary design methods for the design of electrical grounding systems for hydropower projects by integrating technologies such as engineering three-dimensional visualization, engineering BIM models, AI recognition, and automatic analysis and calculation of engineering data. It uses digital means to improve the efficiency of grounding system design, and at the same time, through corresponding algorithms, it can find the optimal solution for grounding design scheme safety and engineering cost in a short time. The method involved in the present invention can quickly generate design schemes, report materials, statistical data and other information, and greatly improve the efficiency of processes such as scheme design and adjustment, budget quotation in engineering, report writing, and detailed drawing design. At the same time, the segment-by-segment and point-by-point grounding calculation method can provide more reliable and accurate grounding safety calculation data than traditional design methods, and obtain more accurate and reliable grounding design schemes. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 This is the overall architecture diagram of the hydropower project grounding auxiliary design method system provided by the present invention;

[0059] Figure 2 Flowchart of the execution of the algorithm for generating the preliminary grounding plan provided by the present invention;

[0060] Figure 3 A flowchart of the execution of the algorithm for generating a regional detailed grounding plan provided by the present invention;

[0061] Figure 4 This is a schematic diagram of the grounding grid sub-area division and calculation provided by the present invention. DETAILED DESCRIPTION

[0062] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0063] The present invention provides a hydropower engineering grounding auxiliary design system, referring to Figure 1 It includes a data-connected engineering grounding model reading module, a power station grounding design preliminary plan generation module, a detailed grounding plan generation module for each engineering area, a grounding design results generation module, and a grounding calculation data database.

[0064] The following is a detailed introduction to each functional module:

[0065] (1) Engineering grounding model reading module

[0066] The engineering grounding model reading module includes a power plant geographic model scanning device, an engineering model import and integration submodule, a resistivity intelligent identification submodule, and a power plant model data analysis submodule. It is used to obtain the geographic model of the actual hydropower project area, identify data related to grounding design, and import the identified and marked engineering model into the auxiliary design system platform.

[0067] (1.1) Power station geographic model scanning equipment

[0068] The power station geographic model scanning device is a surveying and mapping drone carrying multiple high-definition oblique photography cameras, which is used to scan the power station engineering area and obtain a high-precision engineering geographic information model, providing a model basis for the analysis and calculation in the subsequent generation of the overall grounding design plan of the power station.

[0069] (1.2) Engineering model import and integration submodule

[0070] The engineering model import and integration submodule is used to import the scanned power station area geographic information model and engineering BIM design models such as hydraulic structures, building structures, electromechanical and metal structure equipment into the hydropower engineering grounding auxiliary design system platform, and coordinately integrate the various professional models to form a complete set of hydropower engineering power station BIM models, and each professional model must contain corresponding standard BIM model information.

[0071] (1.3) Resistivity intelligent identification submodule

[0072] The resistivity intelligent identification submodule is used to intelligently identify the power station's geographic images and model information obtained through oblique photography to analyze and determine the soil and river water resistivity of each area of ​​the power station. This approach primarily utilizes an artificial intelligence algorithm to perform AI-based identification on site data collected using various information within the grounding calculation database. First, the collected model's geographic coordinates are used to search the database for the primary soil and water quality types in the current area. Next, the collected site images are compared with various standard soil and water quality images in the database for identification. The identification process utilizes a dataset of terrain image feature values ​​generated through AI training within the database to compare and identify the various field images and data. Identification criteria primarily include soil and reservoir surface color, area, elevation, vegetation coverage, and photography time. Parameter categories are adjusted based on the identified object. After identifying the soil and water quality types, soil and river water resistivity parameters for each project area are calculated based on the terrain type and database parameters such as weather, rainfall, and temperature for the corresponding project area. This attribute data is then assigned to the geographic model for the corresponding area, providing the necessary data support for subsequent grounding scheme design.

[0073] (1.4) Power plant model data analysis submodule

[0074] The power station model data analysis submodule is used to organize and identify data of the engineering BIM model of the entire station, divide the engineering model into regions according to design and construction habits and engineering progress management requirements, and automatically measure various types of data in each engineering area that may have an electrical impact on the subsequent grounding design scheme. The main measurement contents include the basic data for electrical calculation of the grounding system, such as the available terrain area for grounding of the upper and lower reservoirs, the total area for grounding of the main and auxiliary powerhouses, the equivalent diameter of the underground powerhouse volume, and the distance from the center of the underground powerhouse to the ground. The above attribute information is added to the corresponding BIM model to provide the required data support for the subsequent grounding scheme design.

[0075] (2) Power station grounding design preliminary scheme generation module

[0076] The power station grounding design preliminary scheme generation module includes a submodule for analyzing the overall grounding scheme for the entire station, a submodule for generating the overall grounding scheme for the entire station, and a submodule for weighted calibration of the overall grounding scheme for the entire station. The grounding design scheme generation algorithm, along with supporting application functions and data, can be used to generate and calibrate the overall grounding scheme for a hydropower station.

[0077] (2.1) Submodule for analyzing the overall grounding scheme of the entire station

[0078] The submodule for analyzing the overall grounding scheme for the entire power station utilizes BIM model data, data such as the short-circuit current calculation parameters for the entire station, and related algorithms to analyze, calculate, and preliminarily organize the grounding calculation data for the entire power station. The main method is to first input or read the calculation results of the previous electrical design process to obtain the maximum short-circuit current flowing through the grounded neutral points of the power plant and substation when the power station experiences the maximum single-phase ground short circuit, and calculate the required resistance value of the total grounding grid of the power station. Next, data for each project area in the BIM model, such as the effective grounding area, resistivity, and equivalent parameters of natural grounding bodies, is organized. The shielding coefficient of the indirect grounding grid for each area is calculated based on the spatial and positional superposition of the project model. The grounding calculation database is consulted to clarify the grounding environmental conditions, grounding design constraints, and special index requirements for each area, clarify the parameter index constraints generated by each condition, and query the database for the preset values ​​of the preferred grounding design weighting coefficient group for each area corresponding to the current scale of the power station project. The calculation and organization of these parameters will provide supporting data for further calculation and comparison of grounding design schemes.

[0079] (2.2) Submodule for generating preliminary plan for whole-station grounding

[0080] The submodule for generating a preliminary site-wide grounding plan invokes the preliminary grounding plan generation algorithm to generate a preliminary site-wide grounding plan. The algorithm provides a visual interface and interactive features, allowing designers to interact with the algorithm in sequence to complete the input, reading, confirmation, and result evaluation of each step of the design data. The generated preliminary site-wide grounding plan includes the material selection for each area's main grounding body, preliminary calculations of the grounding grid resistance for each project area and the total site resistance based on the current plan, recommended resistance reduction measures for each area, and resistance calculation adjustment coefficients for these measures. This function also provides an interface for viewing the calculation methods and process data results for each design step. Furthermore, the aforementioned key power station grounding parameters will serve as the basis for subsequent grounding design calculations. The grounding grid resistance values ​​for each project area calculated in this function will serve as the required grounding grid values ​​for each detailed grounding calculation in each area. This ensures that the parameters of each detailed grounding design plan are more reliable than the preliminary calculated values ​​for each component of the overall design plan, enhancing the safety of the design method. Furthermore, the preliminary site-wide design plan and the corresponding grounding parameters can be automatically adjusted based on the weighting coefficients of the grounding design plan in subsequent functions.

[0081] (2.3) The weighted calibration submodule of the overall site grounding scheme

[0082] The submodule for weighted calibration of the overall site-wide grounding scheme calls the preliminary grounding scheme generation algorithm to calibrate and modify the preliminary site-wide grounding scheme, providing a visual interface for the algorithm and adjusting the weighting coefficients of the preliminary scheme based on the algorithm. The weighting coefficients described in this function are those required to be adjusted in the preliminary scheme generation algorithm for the power station. Each project area is composed of multiple arrays, each with a total weighting coefficient of 10, divided into indicators such as electrical performance, economic efficiency, and durability. Designers can adjust the weighting coefficients at the integer level based on the characteristics of each project area. The preliminary grounding scheme generation algorithm automatically adjusts the preliminary design scheme based on the coefficients and displays the impact of each adjustment on the design indicators in the interface. The grounding calculation data database also stores preset weighting values ​​for each work area of ​​each hydropower station size and the corresponding basic grounding design scheme, as well as weighting value restrictions for each area, such as the minimum electrical weighting coefficient requirement for grounding designs in densely populated areas during the operation and maintenance phase. This facilitates designers to quickly generate preliminary grounding designs and complete cost estimates.

[0083] (3) Detailed grounding plan generation module for each project area

[0084] The module for generating detailed grounding plans for each project area includes a submodule for generating and adjusting the regional grounding grid model, a submodule for generating detailed regional grounding plans, and a submodule for weighted calibration of detailed grounding design plans for each area. This module utilizes the grounding design plan generation algorithm and supporting application functions and data to gradually adjust and calibrate the grounding plan and layout, ultimately generating a detailed grounding design plan for each project area and a three-dimensional grounding body layout model.

[0085] (3.1) Regional grounding grid model generation and adjustment submodule

[0086] The regional grounding grid model generation and adjustment submodule can generate a power station grounding body model in a three-dimensional model environment according to the grounding design scheme calculated and generated in each step. The generated model includes the main grounding body of each region, branch grounding bodies, connection points with equipment, connection points with steel mesh, vertical grounding electrodes, grounding measurement wells and other auxiliary grounding materials. The generated grounding body model will be automatically arranged in the engineering building structure and terrain model. The arrangement process will automatically avoid structures that need to be avoided, such as doors, windows, beams, and columns in the BIM model according to the arrangement algorithm. The grounding body arrangement will be modeled according to the burial depth requirements of each area. When arranging the grounding grid in the building structure, each layer and each area will be connected in three-dimensional space to form a spatial grounding grid to provide support for subsequent segment-by-segment grounding impedance calculations. At the same time, the generated grounding model can be adjusted and counted in the model for the arrangement of each grounding body, grounding auxiliary materials, etc. according to subsequent adjustment commands.

[0087] (3.2) Regional detailed grounding plan generation submodule

[0088] The submodule for generating detailed grounding schemes for each project area will call upon the regional detailed grounding scheme generation algorithm to complete the generation of detailed grounding design schemes for each project area of ​​the power station, providing an interface and functionality for viewing the generated grounding body models in a 3D model environment. The generated detailed grounding design scheme includes detailed material selection for the main and branch grounding bodies in each area, as well as their layout and usage statistics in 3D space; auxiliary grounding measures and auxiliary grounding material layout and usage statistics; the connection method between the grounding grid and equipment and natural grounding bodies; the calculated resistance values ​​of the grounding grid sub-areas within each area, and the calculation results of the electromotive force verification of each regional grounding grid. An interface is also provided for designers to interact and view the calculation methods and results of each step.

[0089] (3.3) Regional detailed grounding design scheme weighted calibration submodule

[0090] The Regional Detailed Grounding Design Weighted Calibration submodule uses the preliminary grounding plan generation algorithm to calibrate and modify the detailed grounding plan for the entire site. Based on the algorithm, it adjusts the weighting coefficients for each regional detailed grounding plan and provides a 3D visualization interface to display the impact of each adjustment on the plan layout and parameter indicators. The weighting coefficients described in this function are the weighting coefficients required for the regional detailed grounding design. Each project area is composed of multiple segments, each with a total weighting coefficient of 10. These weighting coefficients are divided based on electrical, economic, and durability performance. Designers can adjust the weighting coefficients of the grounding plan to the decimal level based on the preliminary design and the characteristics of each project area. The weighting coefficients affect the material selection and material ratio of the main and branch grounding bodies in each regional detailed design. For example, the material selection of the grounding grid in each area and the welding method between different grounding materials can be modified based on the priority and importance of the grounding body. The weighting coefficients also affect the resistance reduction measures and material usage. After adjustment, this function and algorithm will recheck the compliance of each grounding design plan until the optimal solution is obtained. Provide designers with detailed grounding design plans and grounding project cost budgets for each area efficiently.

[0091] (4) Grounding design scheme generation algorithm

[0092] The grounding design scheme generation algorithm, divided into two main functional groups, includes a preliminary grounding scheme generation algorithm and a detailed grounding scheme generation algorithm for each project area. These two algorithms enable efficient and detailed generation of power plant grounding schemes at two levels. These two main algorithms incorporate a series of sub-algorithms that utilize BIM models and associated information to calculate, arrange, verify, adjust, and assess grounding schemes. These algorithms combine calculation methods and application functions based on design process requirements, and automatically adjust and verify each design result based on the weighting coefficients set by the designer to achieve the optimal design scheme.

[0093] (4.1) Algorithm for generating preliminary scheme of whole-station grounding

[0094] refer to Figure 2 The algorithm execution process is as follows:

[0095] S1. Read or input the maximum short-circuit current value flowing through the grounded neutral point of the power plant and substation when the maximum single-phase ground short circuit occurs in the power station from the electrical design pre-process.

[0096] S2. Use the relevant formula to calculate the required value of the total grounding grid resistance of the power station.

[0097] R req is the required value of the total grounding grid resistance of the power station, and the calculation formula is:

[0098]

[0099] Where R req Required resistance value of the power station's total grounding grid, I max It is the maximum value of the ground short-circuit current flowing through the grounding grid, provided by the previous power station electrical design calculation process.

[0100] S3. Call the various functions of the engineering grounding model reading module to identify and mark the engineering BIM model, and import the model into the grounding auxiliary design system application platform.

[0101] S4. Read the resistivity data of each project area from the BIM model attachment information.

[0102] S5. Read the data in the BIM model and calculate the spatial parameters of various grounding systems in each area, mainly including the effective grounding grid area, the equivalent dimensions of the natural grounding grid, the shielding coefficient between regional grounding grids, etc.

[0103] S6. Read the preset weighted coefficient group for the entire station and each project area from the grounding calculation data database. The algorithm will calculate the preliminary grounding design scheme based on the proportion of each coefficient in the weighted array, such as electrical, economic, and durability, so that the generated scheme matches the adjustment coefficient of each indicator. And when the adjustment command is received, the weight value will be adjusted step by step as needed to find the optimal design scheme. The weighted coefficients of the three indicators are K E ,K F ,K L , where K E is the economic weighted coefficient, K F is the electrical weighting coefficient, K L is the durability weighting coefficient, K E， K F， K L The sum is 10, and the coefficient is calculated as follows:

[0104] ①Economic weighted coefficient formula:

[0105]

[0106] Where i is the project area number, K1 is the weight ratio adjustment coefficient, K ai K is the price coefficient of the grounding material used in each project area in the preliminary plan. bi A is the price coefficient of the grounding construction technology and supporting parts used in each project area in the preliminary plan. i is the amount of grounding grid material used in each area in the preliminary plan, k' Ei It is the economic adjustment coefficient after the detailed design plan of each area. K1 is determined according to the weighted coefficient and is used to adjust the calculation result ratio to achieve the sum of the weighted coefficients to be 10; K ai , K biIt is used to reflect the price level of grounding materials and processes. The higher the value, the higher the price, which is inversely proportional to the economic weighted coefficient. i Used to reflect the use of grounding materials; k' Ei Used for subsequent detailed plan adjustments and modifications to the economic performance of the preliminary plan. The default value in the preliminary plan calculation is 1.

[0107] ②Electrical weighting coefficient formula

[0108]

[0109] Where i is the project area number, K2 is the weight ratio adjustment coefficient, R req is the required value of the total grounding grid resistance of the power station, R total is the calculated value of the power station's main grounding grid, K ai K is the electrical performance coefficient of the grounding material in the preliminary plan of each project area. bi is the adjustment coefficient of grounding resistance reduction measures in the preliminary plan for each project area, R i is the impedance calculation value of each project area, K ci is the regional safety level coefficient, k' Fi It is the electrical performance adjustment coefficient after the detailed design scheme for each area. K2 is determined according to the weighted coefficient and is used to adjust the calculation result ratio to achieve a sum of weighted coefficients of 10; R req It is mainly determined by the maximum short-circuit current value of the power station flowing through the grounding grid and the safety potential value required by the specification. total is the parallel calculated value of the impedance of each project area, K F A negative value will inevitably fail to meet the weighted coefficient requirements, so it can be seen from the formula that R total Need to be lower than R req Required value, in line with grounding design specifications; K ai , K bi It is used to reflect the impact of grounding materials and resistance reduction measures on grounding electrical properties, such as material impedance, conductivity, thermal stability, resistance reduction effect, etc. i Used to calculate impedance of each engineering area; K ci It is used to reflect the safety requirement level of each project area, which is determined by factors such as equipment density, equipment voltage level, and personnel density; k' Fi Used for subsequent detailed plans to adjust and modify the electrical performance of the preliminary plan. The default value in the preliminary plan calculation is 1.

[0110] ③ Durability weighted coefficient formula

[0111]

[0112] Where i is the project area number, K3 is the weight ratio adjustment coefficient, K aiis the durability coefficient of the grounding material in each project area, B i is the corrosion degree coefficient of each engineering area, k' Li The durability performance adjustment coefficient after the detailed design plan for each area. K3 is determined based on the weighted coefficient and is used to adjust the calculation result ratio to achieve a sum of weighted coefficients of 10; B i The degree of corrosion in the area where the grounding electrode is laid is related to factors such as the acidity and alkalinity of the soil and water quality and the degree of pollution. Li Used for subsequent detailed plans to adjust and modify the durability performance of the grounding materials in the preliminary plan. The default value in the preliminary plan calculation is 1.

[0113] S7. Enter or adjust the regional resistance reduction adjustment coefficient based on the specific conditions of each region. A higher coefficient ratio makes it more difficult to implement the detailed grounding algorithm for the subsequent region and increases the investment cost, but it also improves the electrical performance of the project's regional grounding grid. The resistance reduction coefficient also affects the overall weighted coefficient ratios of the power station. The grounding calculation database contains preset resistance reduction adjustment coefficients for each region of each hydropower project level.

[0114] S8. Utilizing the algorithm's built-in calculation formulas for various hydropower project indicators, the electrical parameter data calculated in the previous steps, the BIM model attribute information data, and various common grounding calculation parameters stored in the grounding calculation database, the preliminary design resistance values ​​of the grounding grid in each area of ​​the power station are automatically calculated. The calculation method is briefly described as follows:

[0115] Taking the calculation of the grounding resistance of the above reservoir, diversion tunnel, and underground powerhouse as an example, if R1 is set as the grounding resistance of the upper reservoir project area, then R1 is calculated according to the formula:

[0116]

[0117] Where ρ s is the resistivity of river water, k s Calculate the adjustment factor for reservoir resistance and The values ​​are related, S is the area of ​​the upper reservoir.

[0118] If R2 is set as the artificial grounding resistance in the diversion tunnel project area, then R2 is calculated according to the equivalent formula of the grounding grid:

[0119] R2=α1R e2

[0120]

[0121] Where R e2is the equivalent grounding resistance value of the artificial grounding grid of the diversion tunnel to the square grounding grid; α2 is the equivalent conversion coefficient of the grounding grid; S is the total laying area of ​​the diversion tunnel grounding grid, d is the diameter or equivalent diameter of the horizontal grounding body of the diversion tunnel; h is the average burial depth of the diversion tunnel grounding grid; L0 is the total length of the outer edge of the diversion tunnel grounding grid; L is the total length of the horizontal grounding body of the diversion tunnel grounding grid.

[0122] If R3 is set as the artificial grounding resistance of the underground powerhouse project area, the equivalent calculation formula of the grounding grid (the same as the calculation formula of R2) is used for calculation, but R e3 is the equivalent grounding resistance value of the underground powerhouse artificial grounding grid to the square grounding grid; α3 is the equivalent conversion coefficient of the grounding grid; S is the total laying area of ​​the underground powerhouse grounding grid, d is the diameter or equivalent diameter of the underground powerhouse horizontal grounding body; h is the average burial depth of the underground powerhouse grounding grid; L0 is the total length of the outer edge line of the underground powerhouse grounding grid; L is the total length of the horizontal grounding body of the underground powerhouse grounding grid.

[0123] Similarly, the relevant formula can be used to calculate the power station project area R1 to R n The grounding impedance value is used to calculate R total Calculated value of the power station's main grounding grid.

[0124] S9. Use the shielding coefficient between regional grounding grids and the corresponding calculation formula to complete the parallel calculation of the regional grounding grids of the entire station and obtain the calculated value of the preliminary design scheme of the power station's total grounding grid. The calculation is briefly described as follows:

[0125] Calculated value of the power station's main grounding grid R total The calculation formula is:

[0126] R total =k1R1 / / k2R2 / / k3R3…… / / k n R n

[0127] Where n is the power station project area number; R total is the calculated value of the power station's main grounding grid, R n is the calculated resistance value of the engineering part, k n The shielding coefficient is calculated in parallel between the grounding grids in each area of ​​the project; / / is the symbol for impedance parallel calculation. When calculating in parallel, the parallel connection and shielding coefficient calculation should be performed according to the actual connection sequence of the grounding grids in each project area. For example, if the actual project hub is arranged so that the upper reservoir grounding grid is connected to the water diversion tunnel grounding grid and then to the underground powerhouse grounding grid, the k1R1 / / k2R2 / / k3R3 parallel calculation sequence should be used to obtain the calculated grounding impedance value of the entire power station according to this method. n The impedance calculation formula varies depending on the project location.

[0128] S10. Compare the calculated required resistance value of the total grounding grid of the power station with the calculated value of the preliminary design scheme of the grounding system of the entire station. If the total resistance value of the preliminary design scheme is greater than the required resistance value of the total grounding grid of the power station, it is considered not in compliance, and the algorithm automatically returns to step S6 to modify the weighted array, and gradually increase the proportion of the weighted coefficient of the electrical index by region to regenerate the scheme; if the total resistance value of the preliminary design scheme is less than the required resistance value of the total grounding grid of the power station, it is considered in compliance, but if the proportion of the economic weighted coefficient is lower than a certain index, the algorithm will be deemed to need adjustment and automatically return to step S6 to modify the weighted array to optimize the grounding design scheme, and gradually increase the proportion of the economic index weighted coefficient by region until the optimal grounding design scheme is obtained and confirmed, and then proceed to step S11. The formula for adjusting the priority coefficient of the grounding design scheme of the engineering area is:

[0129]

[0130] Where i is the project area number, S i is the laying area of ​​the grounding network of each project, V ai is the average area price of grounding materials in each project area, V bi is the average area price of grounding technology and supporting equipment, K s is the regional safety requirement level, P s K is the probability of electrical accidents in the region, which is used to reflect the probability of electrical accidents such as equipment short circuit, lightning strike, and misoperation in previous engineering operations in this region. ci The higher the project location, the higher the priority level of the grounding scheme adjustment. The formula shows that the higher the grounding laying cost, the lower the safety requirements, and the lower the probability of construction in the area, the higher the priority level of the project area. This priority setting is used to adjust the area with the greatest impact on the grounding system cost first while ensuring the safety and reliability of the grounding system.

[0131] S11. Generate a preliminary design plan for the entire station grounding based on the calculation and adjustment results, organize relevant result data, and end the algorithm process for generating the preliminary plan for the entire station grounding.

[0132] (4.2) Algorithm for generating detailed grounding schemes for each project area

[0133] refer to Figure 3 The algorithm execution process is as follows:

[0134] S1. Based on the parameters provided in the preliminary site-wide grounding plan, a 3D model of each area's main grounding electrodes, branch grounding electrodes, and other auxiliary grounding materials is generated within the 3D BIM model. The 3D model generation considers the actual civil structure and terrain model to avoid unreasonable grounding electrode layouts and ensures effective connections between grounding electrodes and between grounding electrodes and protective equipment within the 3D space. Furthermore, upon receiving an adjustment command, the type and layout of the generated model are adjusted based on the weighting coefficients.

[0135] S2. Divide the grounding grid model within each project area into sub-regions. Parameterize data such as grounding material impedance, natural grounding conditions, and equivalent adjustment coefficients based on the layout of grounding bodies and grounding equipment connections within the sub-regions. Calculate the grounding impedance values ​​for each sub-region, segment by segment, starting from the edge of the grounding grid based on the series and parallel relationships between grounding bodies and grounding equipment. Record and label each sub-region of the grounding grid. Calculate the grounding impedance values ​​for each sub-region and the detailed electrical impedance calculation for the entire grounding grid within the project area.

[0136] During calculation, the grounding grid is divided into sub-areas A1 to A along the edge. n , the sub-area division should contain at least one grounding mesh hole, and then calculate the grounding mesh resistance in each area based on the electrical properties of the material, length, series and parallel relationship, etc., and then merge the grounding mesh impedance of the adjacent sub-area into the grounding mesh of this area according to the number of connection points between the sub-area grounding meshes, and perform impedance calculation, such as Figure 4 The connection points between areas A1 and A2 are marked as 1 and 2. When calculating the regional impedance from the perspective of area A2, the impedance of area A1 is regarded as the impedance value between connection points 1 and 2, and the impedance value of area A2 is obtained by parallel calculation. Similarly, the connection points between areas A1 and A3 are marked as 3, 4, and 5. When calculating the regional impedance from the perspective of area A3, the impedance of A1 is regarded as the impedance value between connection points 3, 4, and 5, and the impedance value of area A3 is obtained by parallel calculation. The calculation of the impedance of all sub-areas is completed by analogy to obtain the overall electrical impedance value of the grounding grid in this project area and the calculated internal impedance value of each sub-area.

[0137] S3. The algorithm will recommend and preset the standard schemes for the corresponding scale and region stored in the grounding calculation data database based on the characteristics of each region. After selecting and confirming the auxiliary grounding resistance reduction measures that can be taken, the algorithm will generate the layout plan of this region in the three-dimensional model based on the corresponding measure plan data, and incorporate the impedance effect of the measures into the sub-region grounding calculation in a parameterized form. It will adjust and modify the impedance effect of each measure on the grounding grid in each sub-region, and update the calculation to obtain the impedance value of the grounding grid in each region after adopting the resistance reduction measures and considering the shielding coefficient. The calculation formula is as follows:

[0138] R` n =k z1 R z1 / / k z2 R z2 / / k z3 R z3 …… / / k zn R zn / / k j R j

[0139] Where n is the power station project area number, zn is the grounding grid sub-area number within a certain project area; R` n is the impedance value of each project part after adjustment, such as the resistance value of the underground powerhouse project area; / / is the impedance parallel calculation symbol; k zn is the comprehensive coefficient of grounding resistance reduction measures and shielding measures in each grounding grid sub-area, R zn Calculate impedance values ​​for ground grid sub-areas; k j To increase the grounding electrode adjustment factor; R j To increase the parallel impedance of the grounding electrode.

[0140] During parallel calculation, the system will consider the actual series and parallel relationship of the grounding grid in each area according to the grounding model layout and complete the resistance value calculation of the project area according to the resistance calculation method between sub-areas in step S2.

[0141] S4. The algorithm will compare and determine whether the impedance value of the grounding grid in each area obtained after detailed adjustment meets the required value of the grounding impedance of each area in the preliminary grounding plan of the entire station. If it is higher than the required value, it is considered not to meet the requirements, and the algorithm will automatically return to step S1 to modify the parameters and plan details such as grounding material selection, detailed layout plan, resistance reduction measures, etc. in the area. During the modification, the system will automatically adjust the priority coefficient according to the design plan of each sub-area to gradually expand the modification range of the grounding grid sub-area, and gradually increase the factors in the layout plan that will affect the electrical parameter indicators until the optimal solution is obtained; if it is lower than the required value, it is considered to meet the requirements, and the algorithm will continue to step S5.

[0142] S5. Perform verification calculations for contact potential, step potential, and impact electromotive force based on the electrical parameters corresponding to the current regional grounding design scheme and the model layout in the three-dimensional environment provided in step S4. If any of the verification calculations do not meet the verification conditions, it is considered non-compliant, and the system automatically returns to step S1 to modify the parameters and solution details such as the grounding material selection, detailed layout plan, and resistance reduction measures in the region. If all verification calculations meet the requirements, it is considered compliant, and the system proceeds to step S6.

[0143] S6. Call the grounding design specification requirements of the corresponding project parts in the grounding calculation data database to judge various electromotive force parameters, regional grounding impedance, grounding network layout plan, grounding body layout implementation details, etc., and verify whether various electrical indicators meet the requirements. If not, automatically return to step S1 to modify the relevant parameters in the design plan step by step; if it meets the requirements, continue to step S7.

[0144] S7. According to the modified regional detailed grounding plan, adjust the weighted coefficients of each indicator, and judge whether the weight ratios of the electrical, economic and durability coefficients are within the limited range of the preliminary design plan, and whether each weighted coefficient meets the requirements of the relevant limiting conditions. If not, it is deemed to be non-compliant, and the weighted coefficients are gradually modified and returned to step S1 to modify the regional grounding grid design plan step by step. The main method in the modification process is to adjust the priority coefficients according to the design plans of each sub-area of ​​the grounding grid, and modify the grounding materials and verify each indicator of each sub-area of ​​the grounding grid of the project part generated in the previous step. After the refined calculation and material selection of each sub-area, the grounding grid of the project area is divided more finely, and a design plan consisting of multiple grounding materials in the same area is realized to meet the requirements of the optimal grounding design plan. The grounding design plan can be quickly generated and constrained by the weight coefficient. If each weighted coefficient meets the requirements of the preliminary design plan and the relevant limiting conditions, it is deemed to be compliant, and then proceed to step S8. The calculation formula for the adjustment coefficients of each indicator after the detailed design plan is generated is as follows:

[0145]

[0146] Where i is the project area number; k' E The economic adjustment coefficient after the detailed design plan for each region; A price The calculated value of the price for implementing the grounding system in this area in the preliminary grounding design scheme; A' price The calculated price for the grounding system in this area after adjustments to the detailed design plan.

[0147]

[0148] Where i is the project area number; k' Fi Adjustment coefficient of grounding grid electrical performance after detailed design of each area; R i The calculated impedance value of the grounding system for this project is the preliminary grounding design scheme, R' i It is the calculated value of the grounding system impedance of this project part after adjustment of the detailed design plan.

[0149]

[0150] Where i is the project area number, zi is the grounding grid area number within the project area; k' Li The durability adjustment coefficient of the grounding material after the detailed design plan for each area; K zi is the durability performance coefficient of the grounding material in each sub-area of ​​this project; S zi Calculate the area of ​​the grounding grid for each sub-area within the project; S n is the total area of ​​the grounding grid in this project area, K aiIt is the durability performance coefficient of the grounding material in this area during the preliminary design.

[0151] The calculation formula for the adjustment priority coefficient of the design scheme of each sub-area of ​​the grounding grid in the project area is:

[0152]

[0153] Where zi is the sub-area number of the grounding grid in a certain project area, S zi is the area of ​​the grounding grid; V azi is the average area price of grounding materials in each grounding grid area, V bzi K is the average area price of grounding technology and supporting equipment in each grounding grid area; zi n is the safety requirement level coefficient of grounding equipment in each grounding grid sub-area; zi The number of grounding equipment required in each grounding grid area; d zi = is the minimum distance between the main grounding body and the grounding equipment within each grounding grid sub-area. If the distance is less than 1 meter, it is calculated as 1 meter to obtain the design safety margin. The formula shows that sub-areas with higher construction costs, fewer and more remotely located equipment within the grid, and lower equipment safety requirements receive the highest priority for material adjustments. This priority setting aims to prioritize detailed modifications to the sub-area grounding grid design in the detailed design while ensuring safety, while maintaining overall consistency with the preliminary design as much as possible.

[0154] S8. Generate a detailed grounding plan for each area based on the adjustment and calculation results of the above steps, generate a three-dimensional model of the grounding design, and end the algorithm process for generating the detailed grounding plan for each project area.

[0155] (5) Grounding calculation data database

[0156] The grounding calculation data database stores the data required for various grounding arrangements and calculation processes, including electrical and price data of various grounding materials, such as geographical electrical parameters such as soil and river water resistivity under various conditions, lightning strike frequency in various regions and altitudes, various index parameters and restrictive parameters that grounding design must be based on in hydropower specifications, various shapes of grounding grids and electrical parameter curve data, grounding parameter index requirements for various types of electrical equipment, preset reference values ​​of weight coefficient groups for various scales and regions of projects, etc., to provide data support for various functional modules.

[0157] (6) Grounding design results generation module

[0158] The grounding design output generation module includes submodules for generating grounding calculation reports, regional grounding body layout diagrams, and grounding material statistics tables. This module generates various output documents by organizing, compiling, and calculating the main calculation results and key technical indicators of each grounding material model in the 3D model and each step of the algorithm process. The module also includes standardized templates for grounding calculation reports, 3D grounding body layout diagrams, and grounding material statistics tables. By organizing and collecting data and presetting the cut-off angles of each layout diagram in 3D space, various grounding design output documents can be quickly generated.

[0159] The following takes the design of the whole-station grounding scheme of a hydropower project as an example to illustrate the implementation method of the hydropower project grounding auxiliary design system of the present invention:

[0160] Step 1: Complete the development and testing of the application functions and supporting algorithms for the hydropower project grounding auxiliary design system based on relevant requirements and specifications. Simultaneously, complete the construction of a grounding calculation data database and install the program on the designer's computer. Prepare drone equipment for scanning the power station's geographic model at the project site.

[0161] Step 2: Use the power station geographic model scanning drone equipment to complete the geographic information scanning of the entire hydropower project, and import the corresponding data into the hydropower project grounding auxiliary design system platform.

[0162] Step 3: Complete the BIM design of the buildings and equipment of each hub of the hydropower project and import the model into the engineering grounding auxiliary design system platform. The information contained in the BIM model must comply with relevant standards.

[0163] Step 4: Integrate the hydropower project model into the grounding-assisted design system platform. Use the intelligent resistivity identification submodule within the engineering grounding model reading module to identify the resistivity of the entire site terrain model and annotate it within the model. Simultaneously, use the power plant model data analysis submodule to read and organize the data contained in the entire site's engineering BIM model, and use program functions to delineate the engineering grounding system areas.

[0164] Step 5: Calculate and generate a preliminary plan for the power station grounding system using the auxiliary functions of the power station grounding design preliminary plan generation module, the corresponding algorithm, and the data in the grounding calculation data database. Automatically adjust the preliminary plan weighting coefficients for each preset area and the power station as a whole until the optimal solution for the preliminary grounding design plan is obtained, and the grounding impedance requirement value for each project area, the selection of the main grounding body for each area, and the relevant preliminary plan layout are obtained.

[0165] Step 6: Utilize the auxiliary functions of the detailed grounding scheme generation module for each project area, the corresponding algorithm, and the data in the database to calculate and generate the detailed grounding design scheme for each area of ​​the power station, generate a detailed model of the grounding grid for each area in three-dimensional space, use the module functions to analyze and calculate the grounding impedance of each grounding grid sub-area, and calibrate the results for various electrical index parameters according to the program flow, and use the weighted coefficient group to automatically adjust and calibrate the grounding scheme, material selection, and resistance reduction measures for each grounding grid sub-area until the optimal detailed design scheme is obtained for each area grounding grid.

[0166] Step 7: Use the grounding design results generation module's application function workflows and templates to generate a grounding calculation report, a regional grounding body layout diagram, and a grounding material statistics table. Export the relevant data as electronic design results for on-site construction use.

[0167] The present invention provides a new set of auxiliary design methods for the design of electrical grounding systems for hydropower projects by integrating technologies such as engineering three-dimensional visualization, engineering BIM models, AI recognition, and automatic analysis and calculation of engineering data. It uses digital means to improve the efficiency of grounding system design, and at the same time, through corresponding algorithms, it can find the optimal solution for the safety of grounding design solutions and engineering costs in a short period of time. The method involved in the present invention can quickly generate design solutions, report materials, statistical data and other information, greatly improving the efficiency of processes such as scheme design and adjustment, budget quotation in engineering, report writing, and detailed drawing design. At the same time, the use of segment-by-segment and point-by-point grounding calculation methods can provide more reliable and accurate grounding safety calculation data than traditional design methods, resulting in a more accurate, reliable, and economical grounding design solution.

[0168] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A hydropower project grounding auxiliary design system, characterized in that: It includes a data-connected engineering grounding model reading module, a power station grounding design preliminary plan generation module, a detailed grounding plan generation module for each project area, a grounding design results generation module, and a grounding calculation data database; The engineering grounding model reading module includes a power station geographic model scanning device, an engineering model import and integration submodule, a resistivity intelligent identification submodule, and a power station model data analysis submodule; It is used to obtain the geographic model of the actual area of ​​the hydropower project and identify the data information related to the grounding design, and then import the identified and marked project model into the preliminary plan generation module of the power station grounding design; The power station grounding design preliminary scheme generation module includes a full-station grounding overall scheme analysis submodule, a full-station grounding preliminary scheme generation submodule, and a full-station grounding overall scheme weighted calibration submodule; Use grounding design scheme generation algorithms, supporting application functions, and data to complete the generation and calibration of preliminary grounding design schemes for hydropower stations; The detailed grounding scheme generation module for each project area includes a regional grounding grid model generation and adjustment submodule, a regional detailed grounding scheme generation submodule, and a regional detailed grounding design scheme weighted calibration submodule; Utilize the grounding design scheme generation algorithm and supporting application modules and data to gradually adjust and calibrate the grounding scheme and layout, ultimately generating a detailed grounding design scheme for each project area and a 3D grounding body layout model. The grounding calculation data database stores data required for various grounding arrangements and calculations, including electrical and price data for various grounding materials, including soil and river water resistivity under various conditions, geographical electrical parameters of lightning strike frequency at various regions and altitudes, various index parameters and restrictive parameters required for grounding design in hydropower specifications, various shapes and electrical parameter curves of grounding grids, grounding parameter index requirements for various types of electrical equipment, and reference values ​​of weight coefficient groups preset for various scales and regions of projects. It is used to provide data support for the project grounding model reading module, the power station grounding design preliminary plan generation module, and the detailed grounding plan generation module for each project area. The grounding design results generation module includes a grounding calculation report generation module, a regional grounding body layout diagram generation module, and a grounding material statistics table generation module, which is used to organize and count the grounding design schemes and models generated by each module to form various results files.

2. The hydropower project grounding auxiliary design system according to claim 1 is characterized in that: The power station geographic model scanning device is a surveying and mapping drone equipped with multiple high-definition oblique cameras. It is used to scan the power station project area and obtain a high-precision engineering geographic information model, which provides a model basis for the analysis and calculation in the power station grounding design preliminary plan generation module and the detailed grounding plan generation module for each project area. The engineering model import and integration submodule is used to import the scanned power station area geographic information model and the engineering BIM design models of hydraulic structures, building structures, electromechanical and metal structure equipment into the power station grounding design preliminary plan generation module, and coordinately integrate the various professional models to form a complete set of hydropower engineering power station BIM models, and each professional model must contain corresponding standard BIM model information; The resistivity intelligent identification submodule is used to intelligently identify the power station geographic images and model information obtained by oblique photography to analyze and determine the soil and river water resistivity of each area of ​​the power station, and assign relevant attribute data to the geographic model of the corresponding range area. This provides the necessary data support for the design scheme generation module of the power station grounding design preliminary scheme and the detailed grounding scheme generation module for each project area. The power station model data analysis submodule is used to organize and identify data of the engineering BIM model of the entire station, divide the engineering model into regions according to design and construction habits and engineering progress management requirements, and automatically measure and add model attributes to various types of data in each engineering area that may have an electrical impact on the subsequent grounding design plan, providing the required data support for the design plan generation module of the power station grounding design preliminary plan and the detailed grounding plan generation module of each engineering area.

3. The hydropower project grounding auxiliary design system according to claim 1 is characterized in that: The submodule for analyzing the overall grounding scheme of the entire station uses BIM model data, data on the short-circuit current calculation parameters of the entire station, and related algorithms to analyze, calculate, and preliminarily organize the grounding calculation data of the entire power station. Through calculation and organization, the design requirements of the total grounding resistance value of the power station, the grounding design weighted coefficient group of each area, the shielding coefficient between the grounding grids of each area, the available grounding grid area of ​​each area, the grounding environmental conditions of each area, and the grounding design restrictions and special index requirements of each area are obtained as supporting data required for further scheme generation by the detailed grounding scheme generation module of each project area. The submodule for generating a preliminary plan for grounding the entire station will call the preliminary plan generation algorithm to complete the generation of the preliminary plan for grounding the entire station, provide a visual working interface and interactive functions for the algorithm, and interact with the designer in accordance with the algorithm sequence to complete the input, reading, confirmation, and result judgment operations of the design data of each step, generate a preliminary plan for grounding the entire station, and provide a corresponding interface to view the calculation method and data results of each design step; The weighted calibration submodule of the overall grounding scheme for the entire station includes a method for modifying and adjusting the weighted coefficient of the grounding design for the entire station, defines and constrains the design scheme characteristics with electrical, economic and durability indicators, and calls the preliminary grounding scheme generation algorithm to complete the automatic calibration and adjustment modification of the preliminary grounding scheme for the entire station until the optimal preliminary design scheme is obtained; at the same time, a visual working interface is provided for the algorithm, and the weighted coefficient adjustment of the preliminary scheme is completed according to the algorithm, and the impact of each adjustment scheme on the design indicators is displayed in the interface.

4. The hydropower project grounding auxiliary design system according to claim 1 is characterized in that: The regional grounding grid model generation and adjustment submodule generates a power station grounding body model in a three-dimensional model environment according to the grounding design scheme calculated in each step, and adjusts and compiles statistics on the layout of each grounding body and grounding auxiliary materials in the model according to actual conditions and subsequent adjustment commands; The detailed grounding scheme generation submodule for each project area will call the regional detailed grounding scheme generation algorithm to complete the generation of detailed grounding design schemes for each project area of ​​the power station, provide an interface and function to view the generated grounding body model in a three-dimensional model environment, and complete related grounding calculations to generate detailed grounding design schemes for each area. It also provides an interface for designers to interact and view the calculation methods and results of each step. The weighted calibration submodule of the regional detailed grounding design scheme will call the regional detailed grounding design scheme generation algorithm, and adjust each sub-region of the grounding grid of each engineering part section by section, and at the same time further automatically adjust the weighting coefficient at the decimal level to obtain the optimal design scheme; complete the calibration and generation of the detailed grounding design scheme of the entire site, provide a visual working interface for the algorithm, view and adjust in the interface, and finally confirm the detailed grounding scheme of each area and generate a three-dimensional model.

5. The hydropower project grounding auxiliary design system according to claim 1 is characterized in that: The preliminary grounding scheme generation submodule and the detailed grounding scheme generation submodule for each engineering area include sub-algorithms for calculating, arranging, verifying, adjusting and judging the grounding scheme using the BIM model and its ancillary information, and a combination of calculation methods and application functions is performed according to the needs of the design process; the algorithm steps are as follows: first, in the preliminary grounding scheme generation algorithm, the recognition function of the BIM model and the grounding design index calculation formula are used to complete the calculation and generation of the preliminary grounding scheme of the entire station and various basic design index parameters; then, in the detailed grounding scheme generation algorithm for each engineering area, the grounding grid sub-area of ​​each engineering part is further calculated section by section to select the design materials and schemes, and obtain and verify Various design indicators are used to obtain detailed and reasonable grounding plans for each project area. In the above process, the priority coefficients of the grounding design plans for the project area and its sub-areas are set for optimization and sorting. When optimizing the plan, the weighted coefficients of each indicator are adjusted to constrain and judge the optimization method of the refined grounding network selection plan for the project area and its sub-areas, and finally obtain the design plan with the best safety and cost factors. Specifically, the weighted coefficients of the three indicators of electrical performance, economy and durability are set, and the weighted coefficients are used to define and constrain the grounding design plan. The grounding design plan is automatically adjusted by adjusting the proportion of the weighted coefficients of each indicator step by step until the optimal design plan is obtained. The economic weighted coefficient formula is: Where K1 is the weight ratio adjustment coefficient, K ai K is the price coefficient of the grounding material used in each project area in the preliminary plan. bi A is the price coefficient of the grounding construction technology and supporting parts used in each project area in the preliminary plan. i The amount of grounding grid materials used in each area in the preliminary plan, Detailed economic adjustment coefficients for each region after the design plan; The electrical weighting coefficient formula is: Where i is the project area number, K2 is the weight ratio adjustment coefficient, R req is the required value of the total grounding grid resistance of the power station, R total is the calculated value of the power station's main grounding grid, K ai K is the electrical performance coefficient of the grounding material in the preliminary plan of each project area. bi is the adjustment coefficient of grounding resistance reduction measures in the preliminary plan for each project area, R i is the impedance calculation value of each project area, K ci is the regional safety level coefficient, k' Fi Adjustment coefficient of electrical performance after detailed design of scheme for each area; The durability weighted coefficient formula is: Where K3 is the weight ratio adjustment coefficient, K ai is the durability coefficient of the grounding material in each project area, B i is the corrosion degree coefficient of each engineering area, k' Li Durability adjustment factor after detailed design plan for each area; The adjustment priority coefficients for the grounding design schemes in each project area are: Where i is the project area number, S i is the laying area of ​​the grounding network of each project, V ai is the average area price of grounding materials in each project area, V bi is the average area price of grounding technology and supporting equipment, K s is the regional safety requirement level, P s is the probability of regional electrical accidents; Adjustment priority coefficients for design schemes of each sub-area of ​​the grounding grid at each project site: Where, zi is the sub-area number of the grounding grid in a certain project area, S zi is the area of ​​the grounding grid; V azi is the average area price of grounding materials in each grounding grid area, V bzi K is the average area price of grounding technology and supporting equipment in each grounding grid resistance area; zi n is the safety requirement level coefficient of grounding equipment in each grounding grid sub-area; zi The number of grounding equipment required in each grounding grid area; d zi It is the minimum distance between the main grounding body and the grounding equipment in each grounding grid area.

6. The hydropower project grounding auxiliary design system according to claim 5, characterized in that: The grounding preliminary plan generation submodule is specifically used for: S1. Read or input the maximum short-circuit current value flowing through the grounded neutral point of the power plant and substation when the maximum single-phase ground short circuit occurs in the power station from the electrical design pre-process; S2. Calculate the required resistance value of the total grounding grid of the power station based on the basic electrical parameters of the power station provided in S1; S3. Call each submodule in the engineering grounding model reading module to identify and mark the engineering BIM model, and import the model into the power station grounding design preliminary plan generation module program; S4, reading the resistivity data of each project area from the BIM model attached information imported in step S3; S5. Read various spatial data from the BIM model attached information imported in step S3, and calculate various grounding system spatial parameters in each area, including the effective grounding grid area, the equivalent dimensions of the natural grounding grid, and the shielding coefficient between regional grounding grids; S6. Read the preset weighted coefficient groups for the entire station and each project area from the grounding calculation data database. The algorithm will perform a preliminary grounding design solution calculation based on the proportion of each coefficient in the weighted array, such that the configured solution matches the adjustment coefficients of each indicator. When the return adjustment command of step S10 is received, the weight values ​​will be adjusted step by step as needed to find the optimal design solution. S7. Input or adjust the regional resistance reduction measures adjustment coefficient according to the situation of each region; S8. Automatically calculate the resistance value of the preliminary design of the grounding grid for each area of ​​the power station using the calculation formulas for various hydropower project indicators built into the algorithm, the various parameters calculated in steps S4 and S5, the grounding scheme configuration results in step S6, and various common grounding calculation parameters stored in the grounding calculation data database; S9. Using the shielding coefficient between regional grounding grids and the corresponding calculation formula, perform parallel calculation of the regional grounding grids of the entire station obtained in step S8 to obtain the calculated value of the preliminary design of the power station's total grounding grid; S10. Compare the required resistance value of the total grounding grid of the power station calculated in step S2 with the calculated value of the preliminary design scheme of the entire station grounding system obtained in step S9. If the total resistance value of the preliminary design scheme is greater than the required resistance value of the total grounding grid of the power station, it is considered not in compliance, and the algorithm automatically returns to step S6 to modify the weighted array, and gradually increase the proportion of the weighted coefficient of the electrical index by region to regenerate the scheme; if the total resistance value of the preliminary design scheme is less than the required resistance value of the total grounding grid of the power station, it is considered in compliance, but if the proportion of the economic weighted coefficient is lower than a certain index, the algorithm will be deemed to need adjustment and automatically return to step S6 to modify the weighted array to optimize the grounding design scheme, and gradually increase the proportion of the economic index weighted coefficient by region until the optimal grounding design scheme is obtained and confirmed, and then continue to step S11; S11. Generate a preliminary design plan for the entire station grounding based on the calculation and adjustment results, organize relevant result data, and end the algorithm process for generating the preliminary plan for the entire station grounding.

7. The hydropower project grounding auxiliary design system according to claim 5, characterized in that: The detailed grounding plan generation submodule for each project area is specifically used to S1. Read the preliminary grounding plan and parameters for the entire station provided by the preliminary grounding design plan generation module of the power station, and generate three-dimensional models of the main grounding body, branch grounding body, and various auxiliary grounding materials in each area in the three-dimensional BIM model. At the same time, when the adjustment commands of the following steps S4, S5, S6, and S7 are received, the type and layout of the generated model will be adjusted according to the modification of the weighting coefficient; S2. Divide the grounding grid model within each project area into sub-areas. Based on the preliminary grounding layout plan within each sub-area in step S1, calculate the grounding impedance value of each sub-area section by section from the edge of the grounding grid, and obtain the detailed calculated electrical impedance value of the grounding grid as a whole in the project area. S3. The algorithm recommends and presets the standard solutions for the corresponding scale and region stored in the grounding calculation data database based on the characteristics of each region. It selects and confirms the auxiliary grounding resistance reduction measures that can be taken, generates the layout plan for this region in the 3D model based on the corresponding measure plan data, and adjusts the calculated grounding impedance values ​​of each sub-region based on step S2. S4. The algorithm compares and determines whether the impedance values ​​of the grounding grids in each area obtained after adjustment in step S3 meet the required grounding impedance values ​​of each area in the preliminary plan for the entire station grounding. If the impedance values ​​exceed the required values, the algorithm is deemed to be non-compliant and automatically returns to step S1 to modify the grounding material selection, detailed layout plan, resistance reduction measures parameters, and plan details in the area. If the impedance values ​​are lower than the required values, the algorithm is deemed to be compliant and proceeds to step S5. S5. Verify various potential index parameters based on the electrical parameters corresponding to the current regional grounding design scheme and the model layout in the three-dimensional environment provided in step S4. If any verification calculation does not meet the verification conditions, it is considered non-compliant, and the process automatically returns to step S1 to modify the grounding material selection, detailed layout plan, resistance reduction measure parameters, and plan details in the region. If all verification calculations meet the requirements, it is considered compliant, and the process proceeds to step S6. S6. Calling the grounding calculation data database, based on the grounding design specifications for the corresponding project parts, determines the implementation details of the grounding arrangement in each area adjusted in steps S4 and S5, and verifies whether the various electrical indicators meet the requirements. If not, the process automatically returns to step S1 to modify the relevant parameters in the design scheme step by step. If it meets the requirements, the process proceeds to step S7. S7. Based on the modified regional grounding plan in steps S4, S5, and S6, adjust the weighted coefficients of each indicator, and determine whether the weighted ratios of the electrical, economic, and durability coefficients are within the limits of the preliminary design plan, and whether each weighted coefficient meets the requirements of the relevant limiting conditions. If not, it is considered non-compliant, and the weighted coefficients are gradually modified and the process returns to step S1 to modify the regional grounding grid design plan step by step. If each weighted coefficient meets the requirements of the preliminary design plan and the relevant limiting conditions, it is considered compliant, and the process proceeds to step S8. S8. Generate a detailed grounding plan for each area based on the adjustment and calculation results of the above steps, generate a three-dimensional model of the grounding design, and end the algorithm process for generating the detailed grounding plan for each project area.

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