An auxiliary design system for grounding of a hydroelectric project

Abstract

The application provides a water and electricity engineering grounding auxiliary design system, which comprises an engineering grounding model reading module, a power station grounding design preliminary scheme generating module, a detailed grounding scheme generating module of each engineering area, a grounding design result generating module and a grounding calculation data database connected with data. The application can quickly generate design scheme, report materials, statistical data and other data, greatly improves the efficiency of scheme design and adjustment, engineering budget quotation, report writing, detailed drawing design and other processes, and can provide more reliable and accurate grounding safety guarantee calculation data and obtain more accurate and reliable grounding design scheme by using the grounding calculation method of each section and each point.

Description

Technical Field

[0001] This invention belongs to the field of intelligent auxiliary design technology for engineering, and specifically relates to a grounding auxiliary design system for hydropower projects. Background Technology

[0002] In recent years, with the requirements of green, low-carbon, and environmentally friendly economic development, my country's energy structure has been adjusted, and the number and scale of hydropower projects have continued to increase. Consequently, the demands on design efficiency and project cost at each stage of hydropower projects are also constantly rising. Grounding engineering is a crucial part of the safety assurance of hydropower stations, and the safety of the grounding system must be effectively guaranteed. Furthermore, hydropower station grounding engineering involves a large amount of metal materials such as copper and steel, and the selection and layout of these materials will affect the economic indicators of the hydropower station's electrical design. Therefore, the industry urgently needs a new design method that utilizes digital means to reduce project costs, find the optimal solution for the design scheme, and simultaneously reduce design difficulty and time costs while efficiently completing grounding design schemes and detailed layouts, thereby improving overall work efficiency. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a grounding auxiliary design system for hydropower projects, which can effectively solve the aforementioned problems.

[0004] The technical solution adopted in this invention is as follows: a grounding auxiliary design system for hydropower projects, including a data-connected engineering grounding model reading module, a preliminary grounding design scheme generation module for power station, a detailed grounding scheme generation module for each engineering area, a grounding design result 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 acquire the geographic model of the actual area of ​​the hydropower project, identify grounding design-related data information, and import the identified and marked engineering model into the power station grounding design preliminary scheme generation module;

[0006] The power station grounding design preliminary scheme generation module includes a whole-station grounding overall scheme analysis submodule, a whole-station grounding preliminary scheme generation submodule, and a whole-station grounding overall scheme weighted calibration submodule; it uses grounding design scheme generation algorithms, various supporting application functions, and data to complete the generation and calibration adjustment of the whole-station grounding design preliminary scheme for hydropower projects.

[0007] The detailed grounding scheme generation module for each engineering 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. Using the grounding design scheme generation algorithm and various supporting application modules and data, the grounding scheme and layout are gradually adjusted and calibrated to finally generate a detailed grounding design scheme and a three-dimensional layout model of the grounding body for each engineering area.

[0008] The grounding calculation data database stores various grounding layouts and calculation processes, including electrical and price data for various grounding materials, geographical electrical parameters such as soil and river water resistivity under various conditions, lightning strike frequency at various altitudes in different regions, various index parameters and limiting parameters that grounding design must be based on in hydropower codes, grounding grid shape and electrical parameter curve data, grounding parameter index requirements for various types of electrical equipment, and reference values ​​of preset weight coefficient groups for various scales and regions of the project. It is used to provide data support for the engineering grounding model reading module, the power station grounding design preliminary scheme generation module, and the detailed grounding scheme generation module for each engineering area.

[0009] The grounding design results generation module includes a grounding calculation report generation module, a regional grounding electrode layout diagram generation module, and a grounding material statistics table generation module. These modules are used to organize and statistically analyze the grounding design schemes and models generated by each module, forming various result documents.

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

[0011] The engineering model import and integration submodule is used to import the geospatial information model of the power station area obtained by scanning, as well as the engineering BIM design models of hydraulic structures, building structures, electromechanical and metal structure equipment, into the power station grounding design preliminary scheme generation module, and to integrate the coordinates of each professional model to make it a complete hydropower station BIM model, and each professional model must contain the corresponding standard BIM model information.

[0012] The resistivity intelligent identification submodule is used to intelligently identify the geographical images and model information of the power station obtained by oblique photography, so as to analyze and judge the soil and river water resistivity in each area of ​​the power station, and assign relevant attribute data to the geographical model of the corresponding area, providing the necessary data support for the generation of design schemes for the power station grounding design preliminary scheme generation module and the detailed grounding scheme generation module for each engineering area.

[0013] The power station model data analysis submodule is used to organize and identify the data of the entire station's engineering BIM model. According to design and construction habits and project progress management requirements, the engineering model is divided into regions. The submodule automatically measures and adds model attributes to various data in each engineering region that may have an electrical impact on the later grounding design scheme. This provides the necessary data support for the generation of design schemes for the power station grounding design preliminary scheme generation module and the detailed grounding scheme generation module for each engineering region.

[0014] Furthermore, the overall grounding scheme analysis submodule of the entire station utilizes BIM model data and the data of the short-circuit current calculation parameters of the entire station, as well as related algorithms, to analyze, calculate, and preliminarily organize the grounding calculation data of the entire power station. Through calculation and organization, it obtains the design requirement value of the total grounding resistance value of the power station, the grounding design weighting coefficient group of each area, the shielding coefficient between the grounding grids of each area, the usable grounding grid area of ​​each area, the grounding environmental conditions of each area, and the grounding design constraints and special index requirements of each area as the supporting data required for the further scheme generation of the detailed grounding scheme generation module of each engineering area.

[0015] The submodule for generating the preliminary grounding scheme for the entire station will call the preliminary grounding scheme generation algorithm to generate the preliminary grounding scheme for the entire station. It provides a visual working interface and interactive functions for the algorithm. According to the algorithm sequence, the designer interacts with the operator to complete the input, reading, confirmation and result judgment of the design data for each step, generate the preliminary grounding scheme for the entire station, and provide a corresponding interface to view the calculation methods and data results of each design step.

[0016] The weighted calibration submodule for the overall grounding scheme of the entire station includes a method for modifying and adjusting the weighted coefficients of the overall grounding design. It defines and constrains the characteristics of the design scheme with indicators of electricality, economy, and durability, and calls the preliminary grounding scheme generation algorithm to complete the automatic calibration and adjustment of the preliminary grounding scheme of the entire station until the optimal preliminary design scheme is obtained. At the same time, it provides a visual working interface for the algorithm, and displays the impact of each adjustment scheme on the design indicators in the interface.

[0017] Furthermore, the regional grounding grid model generation and adjustment submodule generates a power station grounding body model in the three-dimensional model environment based on the grounding design scheme calculated in each step, and adjusts and statistically analyzes the arrangement of each grounding body and grounding auxiliary materials in the model according to the actual situation and subsequent adjustment commands.

[0018] The detailed grounding scheme generation submodule for each engineering area will call the detailed grounding scheme generation algorithm to generate detailed grounding design schemes for each engineering area of ​​the power station. It provides an interface and functions to view the generated grounding body model in a 3D model environment, and completes relevant grounding calculations to generate detailed grounding design schemes for each area. It also provides an interface that allows designers to interact with and view the calculation methods and results of each step.

[0019] The weighted calibration submodule for the detailed grounding design scheme of the region will call the algorithm for generating the detailed grounding design scheme of the region and adjust each sub-region of the grounding network of each engineering part segment by segment. At the same time, the weighting coefficient will be further automatically adjusted at the decimal level to obtain the optimal design scheme. The calibration and generation of the detailed grounding design scheme of the entire station will be completed, and a visual working interface will be provided for the algorithm to view and adjust. Finally, the detailed grounding scheme of each region will be confirmed and a three-dimensional model will be generated.

[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 grounding schemes using BIM models and associated information. The calculation methods and application functions are combined according to the design process requirements. The algorithm steps are as follows: First, in the preliminary grounding scheme generation algorithm, the BIM model's recognition function and grounding design index calculation formulas are used to calculate and generate the preliminary grounding network scheme for the entire station and various foundation design index parameters. Then, in the detailed grounding scheme generation algorithm for each engineering area, the grounding network sub-area for each engineering part is calculated segment by segment to select design materials and schemes, obtaining the results. By verifying various design indicators, detailed and reasonable grounding schemes for each engineering area are obtained. In the above process, the priority coefficients for adjusting the grounding design schemes of the engineering area and its sub-areas are set to optimize and rank them. When optimizing the scheme, the weighting system of each indicator is adjusted to constrain and judge the optimization method of the refined grounding grid selection scheme of the engineering area and its sub-areas, and finally obtain the design scheme with the best safety and cost factors. Specifically, this includes setting weighting coefficients for three indicators: electrical performance, economy, and durability. The weighting coefficients are used to define and constrain the grounding design scheme, and the grounding design scheme is automatically adjusted until the optimal design scheme is obtained by adjusting the proportion of the weighting coefficients of each indicator step by step.

[0021] The formula for the economic weighting coefficient is as follows:

[0022]

[0023] In the formula, K1 is the weight ratio adjustment coefficient, K ai K represents the price coefficient for grounding materials used in each engineering area in the preliminary plan. bi A represents the price coefficients for grounding construction techniques and components used in each project area in the preliminary plan. ik' represents the amount of grounding grid material used in each area in the preliminary plan. Ei Economic adjustment coefficients after detailed design plans for each region;

[0024] The formula for the electrical weighting factor is:

[0025]

[0026] In the formula, i is the region number of the engineering part, K2 is the weight ratio adjustment coefficient, and R req R is the required value of the total grounding grid resistance of the power station. total K is the calculated value of the power station's total grounding grid. ai K represents the electrical performance coefficient of the grounding material in the preliminary schemes for each engineering area. bi R is the adjustment coefficient for grounding resistance reduction measures in the preliminary scheme of each project area. i K represents the calculated impedance value for each engineering area. ci k' is the regional security level coefficient. Fi This refers to the electrical performance adjustment factor after detailed design schemes for each area;

[0027] The formula for the durability weighting factor is:

[0028]

[0029] In the formula, K3 is the weight ratio adjustment coefficient, K ai B represents the durability coefficient of the grounding materials in each engineering area. i k' represents the corrosion coefficient for each engineering area. Li For durability performance adjustment factors after detailed design schemes for each region;

[0030] The priority coefficients for adjusting the grounding design schemes for each project area are as follows:

[0031]

[0032] In the formula, i is the area number of the engineering part, and S i V represents the area of ​​the grounding grid laid for each project. ai The average area price of grounding materials in each project area, V bi K represents the average area price of grounding technology and related equipment. s For regional security requirements level, P s The probability of an electrical accident occurring in the area;

[0033] Priority coefficients for adjusting the design schemes of each sub-area of ​​the grounding grid in each engineering section:

[0034]

[0035] In the formula, zi is the sub-area number of the grounding grid within a certain engineering section, and Szi V represents the area of ​​the grounding grid sub-region; azi The average area price of grounding materials for each sub-area of ​​the grounding grid, V bzi K represents the average area price of grounding technology and supporting equipment for each grounding grid resistance area; zi n represents the safety requirement level coefficient for grounding equipment within each sub-area of ​​the grounding grid. zi Number of devices requiring grounding within each grounding grid sub-area; d zi This refers to the minimum distance between the main grounding electrode and the grounding equipment within each sub-area of ​​the grounding grid.

[0036] Furthermore, the preliminary grounding scheme generation submodule is specifically used for:

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

[0038] S2. Based on the basic electrical parameters of the power station provided by S1, calculate the required value of the total grounding grid resistance of the power station;

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

[0040] S4. Read the resistivity data of each engineering area from the BIM model auxiliary information imported in step S3;

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

[0042] S6. Read the preset weighted coefficient group for the entire station and each engineering area from the grounding calculation data database. The algorithm will perform preliminary grounding design scheme calculation based on the proportion of each coefficient of electrical, economic and durability in the weighted array to match the configured scheme with the adjustment coefficients of each index. When the return adjustment command of step S10 is received, the weights will be adjusted step by step as needed to find the optimal design scheme.

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

[0044] S8. Using the built-in calculation formulas for various indicators of hydropower projects, the various parameters calculated in steps S4 and S5, the grounding scheme configuration results in step S6, and the various general grounding calculation parameters stored in the grounding calculation data database, the preliminary design resistance value of the grounding grid in each area of ​​the power station is automatically calculated.

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

[0046] S10. Compare the required total grounding grid resistance value of the power station obtained in step S2 with the calculated value of the preliminary design scheme of the entire grounding system obtained in step S9. If the total resistance value of the preliminary design scheme is greater than the required total grounding grid resistance value of the power station, it is considered non-compliant. Then, the algorithm will automatically return to step S6 to modify the weighted array and increase the weighting coefficient ratio of the electrical indicators by region to regenerate the scheme. If the total resistance value of the preliminary design scheme is less than the required total grounding grid resistance value of the power station, it is considered compliant. However, if the proportion of the economic weighting coefficient is lower than a certain indicator, the algorithm will consider it to need adjustment and will automatically return to step S6 to modify the weighted array to optimize the grounding design scheme. The weighting coefficient ratio of the economic indicators will be increased by region by region until the optimal grounding design scheme is obtained and confirmed. Then, the algorithm will continue to step S11.

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

[0048] Furthermore, the detailed grounding scheme generation submodule for each engineering area is specifically used for

[0049] S1. Read the preliminary grounding scheme and parameters of the entire station provided by the power station grounding design preliminary scheme generation module, and generate three-dimensional models of the main grounding body, branch grounding body and various auxiliary grounding materials 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 types and layout schemes of the generated models will be adjusted according to the modification of the weighting coefficient.

[0050] S2. Divide the grounding grid model in each engineering area into sub-regions. Based on the preliminary grounding layout scheme in each sub-region in step S1, calculate the grounding impedance of each sub-region segment by segment from the edge of the grounding grid and obtain the detailed calculation value of the overall resistance of the grounding grid in this engineering area.

[0051] S3. The algorithm will recommend and preset the standard schemes stored in the corresponding scale and area of ​​each region based on the characteristics of each region and the grounding calculation data database. It will select and confirm the auxiliary grounding resistance reduction measures that can be taken, and generate the layout scheme of the region in the three-dimensional model according to the corresponding measure scheme data. Based on step S2, it will adjust the grounding impedance calculation value of each sub-region.

[0052] S4. The algorithm will compare and judge whether the impedance values ​​of the grounding grids of each area obtained after the adjustment in step S3 meet the requirements of the grounding impedance of each area in the preliminary grounding scheme of the whole station. If the impedance values ​​are higher than the requirements, it is considered not to meet the requirements, and the algorithm will automatically return to step S1 to modify the selection of grounding materials, detailed layout scheme, resistance reduction measures parameters and scheme details in the area. If the impedance values ​​are lower than the requirements, it is considered to meet the requirements, and the algorithm will continue to step S5.

[0053] S5. Based on the current area grounding design scheme and the electrical parameters corresponding to the model layout in the 3D environment provided in step S4, perform various potential index parameters verification. If any verification calculation fails to meet the verification conditions, it is considered non-compliant. Then, automatically return to step S1 to modify the selection of grounding materials, detailed layout scheme, resistance reduction measures parameters, and scheme details within the area. If all verification calculations meet the requirements, it is considered compliant and proceed to step S6.

[0054] S6. Call the grounding calculation data database to check the grounding design specifications for the corresponding engineering parts, and judge the implementation details of the grounding electrode layout in each area after the adjustments in steps S4 and S5. Verify whether the electrical indicators meet the requirements. If they do not meet the requirements, automatically return to step S1 to modify the relevant parameters in the design scheme step by step. If they meet the requirements, continue to step S7.

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

[0056] S8. Based on the adjustments and calculation results of the above steps, generate detailed grounding schemes for each area, generate three-dimensional models of the grounding design, and end the algorithm flow for generating detailed grounding schemes for each engineering area.

[0057] The beneficial effects of this invention are as follows: This invention provides a new auxiliary design method for the design of electrical grounding systems in hydropower projects by integrating technologies such as 3D engineering visualization, BIM engineering models, AI recognition, and automatic analysis and calculation of engineering data. It improves the efficiency of grounding system design through digital means and, through corresponding algorithms, finds the optimal solution for grounding design scheme safety and project cost in a short time. The method of this invention can quickly generate design schemes, reports, statistical data, etc., significantly improving the efficiency of processes such as scheme design and adjustment, budget quotation, report writing, and detailed design. Furthermore, the segment-by-segment, point-by-point grounding calculation method provides more reliable and accurate grounding safety calculation data than traditional design methods, resulting in a more accurate and reliable grounding design scheme. Attached Figure Description

[0058] Figure 1 The overall system architecture diagram of the grounding auxiliary design method for hydropower projects provided by this invention;

[0059] Figure 2 The execution flowchart of the grounding preliminary scheme generation algorithm provided by the present invention;

[0060] Figure 3 The execution flowchart of the regional detailed grounding scheme generation algorithm provided by the present invention;

[0061] Figure 4 This is a schematic diagram illustrating the sub-region division and calculation of the grounding grid provided by the present invention. Detailed Implementation

[0062] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the invention.

[0063] This invention provides a grounding auxiliary design system for hydropower projects, with reference to... Figure 1 It includes a data-connected engineering grounding model reading module, a power station grounding design preliminary scheme generation module, a detailed grounding scheme generation module for each engineering area, a grounding design result generation module, and a grounding calculation data database.

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

[0065] (I) Engineering Grounding Model Reading Module

[0066] 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 acquire the geographic model of the actual area of ​​the hydropower project, identify grounding design-related data, and import the identified and marked engineering model into this auxiliary design system platform.

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

[0068] The power station geographic model scanning equipment is a surveying drone carrying multiple high-definition oblique photography cameras, used to scan the power station engineering area to obtain a high-precision engineering geographic information model, providing a model basis for analysis and calculation in the subsequent generation of the overall grounding design scheme 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 geospatial information model of the power station area obtained by scanning, as well as the engineering BIM design models of hydraulic structures, building structures, electromechanical and metal structure equipment, into the hydropower engineering grounding auxiliary design system platform, and to integrate the coordinates of each professional model to make it a complete hydropower power station BIM model, and each professional model must contain the corresponding standard BIM model information.

[0071] (1.3) Resistivity Intelligent Identification Submodule

[0072] The resistivity intelligent identification submodule is used to intelligently identify the geographical images and model information of the power station obtained by oblique photography, in order to analyze and determine the soil and river water resistivity of various areas of the power station. Its main method is to use artificial intelligence algorithms to identify the data collected on-site using various information in the grounding calculation data database. First, it uses the collected model geographical coordinates to find the main soil and water quality types in the current area within the grounding calculation data database. Then, it compares and identifies the collected on-site images with various standard soil and water quality images in the database. The identification process uses various terrain image feature value recognition data groups generated by artificial intelligence training and built into the database to compare and identify various on-site collected images and data. Identification items mainly include the color value, area, altitude, vegetation coverage ratio, and shooting time of soil and reservoir water surfaces, and the parameter categories will be adjusted according to the corresponding identification objects. After identifying the soil and water quality types, it calculates the soil and river water resistivity parameters of each area of ​​the project based on the terrain category and the meteorological, rainfall, and temperature parameters of the corresponding project area in the database, assigning relevant attribute data to the geographical model of the corresponding area. This provides 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 the data of the entire station's engineering BIM model. According to design and construction habits and project progress management requirements, the engineering model is divided into regions. Automatic model measurement is performed on various data in each engineering region that may have an electrical impact on the subsequent grounding design scheme. The main measurement contents include the usable terrain area for grounding of the upper and lower reservoirs, the total area for grounding of the main and auxiliary powerhouses, the volume equivalent diameter of the underground powerhouse, the distance from the center of the underground powerhouse to the ground, and other basic data for electrical calculation of the grounding system. The above attribute information is added to the corresponding BIM model to provide the necessary data support for the subsequent grounding scheme design.

[0075] (II) Power Plant Grounding Design Preliminary Scheme Generation Module

[0076] The preliminary grounding design scheme generation module for the power station includes a sub-module for overall grounding scheme analysis, a sub-module for generating a preliminary grounding scheme for the entire station, and a sub-module for weighted calibration of the overall grounding scheme for the entire station. It can utilize the grounding design scheme generation algorithm and various supporting application functions and data to complete the generation and calibration adjustment of the preliminary grounding design scheme for the hydropower station.

[0077] (2.1) Overall Grounding Scheme Analysis Submodule

[0078] The overall grounding scheme analysis submodule utilizes BIM model data, short-circuit current calculation parameters, and related algorithms to analyze and preliminarily organize the overall grounding calculation data of the power station. The main method involves first inputting or retrieving the results of the electrical design's preliminary calculations to obtain the maximum short-circuit current flowing through the neutral points of the power plant and substation when a maximum single-phase ground fault occurs, and then calculating the required total grounding grid resistance. Next, it organizes data such as effective grounding area, resistivity, and equivalent parameters of natural grounding bodies for each engineering area in the BIM model. Simultaneously, it calculates the shielding coefficient of the indirect grounding grid for each area based on the spatial and positional superposition relationships of the engineering model. It then queries the grounding calculation database to clarify the grounding environmental conditions, grounding design constraints, and special index requirements for each area, identifying the parameter restrictions generated by each condition. Finally, it queries the database for the preset values ​​of the preferred grounding design weighted coefficient group for the current scale of the power station project in each area. After calculating and organizing the above parameters, it provides supporting data for further grounding design scheme calculations and comparisons.

[0079] (2.2) Submodule for generating preliminary grounding scheme for the entire station

[0080] The submodule for generating the preliminary grounding scheme for the entire station calls the algorithm to generate the preliminary grounding scheme for the entire station. It provides a visual interface and interactive functions for the algorithm, allowing designers to interact with it according to the algorithm sequence to complete operations such as data entry, retrieval, confirmation, and result judgment for each step. The generated preliminary grounding scheme for the entire station includes the selection of main grounding body materials for each area, the preliminary calculated grounding grid resistance values ​​for each engineering area and the total resistance value of the entire station, the recommended resistance reduction measures for each area, and the corresponding resistance calculation adjustment coefficient values. This function also provides an interface to view the calculation methods and process data results for each design step. Furthermore, the aforementioned major power station grounding parameters will serve as the basis for subsequent grounding design calculations. The grounding grid resistance values ​​for each engineering area calculated in this function will be used as the required values ​​for the grounding grid in the time zone for subsequent detailed grounding calculations of each area, ensuring that the reliability of the parameters in the detailed grounding design scheme for each area is higher than the preliminary calculation requirements of each part of the overall design scheme, thus improving the safety of this design method. Moreover, the preliminary design scheme and corresponding grounding parameters of the power station can be automatically matched and modified according to the weighting coefficient adjustment of the grounding design scheme in subsequent functions.

[0081] (2.3) Weighted calibration submodule of the overall grounding scheme of the entire station

[0082] The weighted calibration submodule for the overall grounding scheme of the entire station calls the preliminary grounding scheme generation algorithm to complete the calibration and adjustment of the preliminary grounding scheme for the entire station. It provides a visual working interface for the algorithm and adjusts the weighting coefficients of the preliminary scheme based on the algorithm. The weighting coefficients mentioned in this function are the weighting coefficients that need to be adjusted in the preliminary scheme generation algorithm of the power station. Each engineering area is composed of multiple array segments, with the sum of the weighting coefficients of each segment being 10. They are divided according to indicators such as electrical performance, economy, and durability. Designers can adjust the weighting coefficients at integer levels according to the characteristics of each engineering area. The preliminary grounding scheme generation algorithm will automatically adjust the preliminary design scheme based on the coefficients and display the impact of each adjustment scheme on the design indicators in the interface. Simultaneously, the grounding calculation data database stores the preset weighting values ​​and corresponding basic grounding design schemes for each work area of ​​each scale of hydropower station, as well as the weighting value restrictions for each area, such as the minimum requirement for the electrical weighting coefficient in the grounding design of densely populated areas during the operation and maintenance phase. This facilitates designers to quickly generate preliminary grounding design schemes and complete cost estimations.

[0083] (III) Module for Generating Detailed Grounding Schemes for Each Engineering Area

[0084] The detailed grounding scheme generation module for each engineering area includes a regional grounding grid model generation and adjustment submodule, a regional detailed grounding scheme generation submodule, and a weighted calibration submodule for detailed grounding design schemes in each area. Utilizing the grounding design scheme generation algorithm and its supporting application functions and data, the grounding scheme and layout can be gradually adjusted and calibrated, ultimately generating detailed grounding design schemes and three-dimensional grounding electrode layout models for each engineering area.

[0085] (3.1) Submodule for generating and adjusting the regional grounding grid model

[0086] The submodule for generating and adjusting the regional grounding grid model can generate a power station grounding body model in a 3D model environment based on the grounding design scheme calculated in each step. The generated model includes the main grounding body, branch grounding bodies, connection points with equipment, connection points with steel mesh, vertical grounding electrodes, grounding measurement wells, and other auxiliary grounding materials for each area. The generated grounding body model will be automatically arranged in the engineering building structure and terrain model. During the arrangement process, the algorithm will automatically avoid structures marked as doors, windows, beams, columns, etc. in the BIM model that need to be avoided. The grounding body arrangement will be generated according to the burial depth requirements of each area. When the grounding grid is arranged in the building structure, each layer and area will be connected to form a spatial grounding grid in 3D space to provide support for subsequent segment-by-segment grounding impedance calculation. At the same time, the generated grounding model can be adjusted and statistically analyzed in the model according to subsequent adjustment commands.

[0087] (3.2) Submodule for generating detailed grounding schemes for the region

[0088] The detailed grounding scheme generation submodule for each engineering area will call the detailed grounding scheme generation algorithm to generate detailed grounding design schemes for each engineering area of ​​the power station. It provides an interface and functions for viewing the generated grounding electrode models in a 3D model environment. The generated detailed grounding design schemes include the selection of main grounding electrodes and branch grounding electrodes materials for each area, their arrangement and usage statistics in 3D space, auxiliary grounding measures schemes and auxiliary grounding material arrangement and usage statistics, the connection methods between the grounding grid and equipment and natural grounding electrodes, the sub-regional resistance values ​​of the grounding grid calculated segment by segment in each area, and the electromotive force verification calculation results for each area of ​​the grounding grid. An interface is provided so that designers can interact with and view the calculation methods and results of each step.

[0089] (3.3) Weighted calibration submodule for detailed regional grounding design

[0090] The weighted calibration submodule for the detailed grounding design scheme of the region calls the preliminary grounding scheme generation algorithm to complete the calibration and adjustment of the detailed grounding design scheme for the entire station. Based on the algorithm, it adjusts the weighting coefficients of the detailed grounding scheme for each region, and provides a 3D visualization interface to show the impact of each adjustment on the scheme layout and parameter indicators. The weighting coefficients mentioned in this function are the weighting coefficients that need to be adjusted in the detailed grounding design scheme of the region. Each engineering region is composed of multiple array segments, with the sum of the weighting coefficients of each segment being 10. They are divided according to indicators such as electrical performance, economy, and durability. Designers can adjust the weighting coefficients of the grounding scheme at the decimal level based on the characteristics of each engineering region, based on the preliminary design scheme. The weighting coefficients affect the material selection of the main grounding body and branch grounding bodies in each region's detailed design scheme, as well as the proportion of various materials. For example, the grounding body will follow the adjustment of the weighting coefficients, modifying the material selection of some grounding grids in the same region segment by segment according to primary and secondary importance, and the welding method between different grounding materials. The weighting coefficients also affect the resistance reduction measures and the scale of material usage. After adjustment, this function and algorithm will re-verify the compliance of various grounding design schemes until the optimal solution is obtained. It provides designers with efficient and detailed grounding design schemes and grounding project cost budgets for each area.

[0091] (iv) Grounding Design Scheme Generation Algorithm

[0092] The grounding design scheme generation algorithm, divided into two main functions, includes a preliminary grounding scheme generation algorithm and a detailed grounding scheme generation algorithm for each engineering area. This allows for efficient and detailed generation of power station grounding design schemes in two levels. Simultaneously, the two main algorithms contain a series of sub-algorithms that utilize BIM models and associated information for grounding scheme calculation, layout, verification, adjustment, and judgment. The calculation methods and application functions are combined according to the design process requirements, and the algorithm can automatically adjust and verify the design results at each stage based on the weighting coefficients set by the designer to obtain the optimal design scheme.

[0093] (4.1) Algorithm for generating preliminary grounding scheme for the entire station

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

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

[0096] S2. Calculate the required total grounding grid resistance of the power station using relevant formulas.

[0097] R req The required value for the total grounding grid resistance of the power station is calculated using the following formula:

[0098]

[0099] In the formula R req Required value of total grounding grid resistance of power plant, I max The maximum value of the short-circuit current flowing through the grounding grid is provided by the preceding power station electrical design calculation process.

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

[0101] S4. Read the resistivity data of each engineering area from the BIM model's supplementary information.

[0102] S5. Read the data from the BIM model and calculate the spatial parameters of various grounding systems 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.

[0103] S6. The algorithm retrieves the preset weighted coefficient groups for the entire station and each engineering area from the grounding calculation data database. Based on the proportions of the electrical, economic, and durability coefficients in the weighted array, it performs preliminary grounding design scheme calculations to match the generated scheme with the adjustment coefficients of each indicator. Furthermore, upon receiving an adjustment command, it will adjust the weights step-by-step as needed to find the optimal design scheme. The weighting coefficients for the three indicators are K. E ,K F ,K L K E For economic weighting coefficients, K F Electrical weighting coefficient, K L K is the durability weighting factor. E， K F， K L The sum is 10, and the coefficients are calculated as follows:

[0104] ① Formula for economic weighting coefficient:

[0105]

[0106] In the formula, i is the region number of the engineering part, K1 is the weight ratio adjustment coefficient, and K ai K represents the price coefficient for grounding materials used in each engineering area in the preliminary plan. bi A represents the price coefficients for grounding construction techniques and components used in each project area in the preliminary plan. i k' represents the amount of grounding grid material used in each area in the preliminary plan. Ei These are the economic adjustment coefficients after detailed design plans for each region. K1 is determined based on weighted coefficients and is used to adjust the proportions of the calculation results to achieve a weighted coefficient sum of 10; K... ai K biThis value reflects the price level of the grounding materials and processes used; the higher the value, the higher the price, inversely proportional to the economic weighting factor. A i Used to describe the application of grounding materials; k' Ei This is used for subsequent detailed plans to adjust and modify the economics of the preliminary plan. The default value in the preliminary plan calculation is 1.

[0107] ②Electrical weighting coefficient formula

[0108]

[0109] In the formula, i is the region number of the engineering part, K2 is the weight ratio adjustment coefficient, and R req R is the required value of the total grounding grid resistance of the power station. total K is the calculated value of the power station's total grounding grid. ai K represents the electrical performance coefficient of the grounding material in the preliminary schemes for each engineering area. bi R is the adjustment coefficient for grounding resistance reduction measures in the preliminary scheme of each project area. i K represents the calculated impedance value for each engineering area. ci k' is the regional security level coefficient. Fi This refers to the electrical performance adjustment coefficients after detailed design schemes for each area. K2 is determined based on weighting coefficients and is used to adjust the calculation results to achieve a weighted coefficient sum of 10; R... req It is mainly determined by the maximum short-circuit current flowing through the grounding grid and the safety potential value required by the specifications, R total K represents the calculated parallel impedance values ​​for each engineering area. F A negative value will inevitably fail to meet the requirements for weighting coefficients; therefore, it can be seen from the formula that R... total It needs to be lower than R req The required value meets the grounding design specifications; K ai K bi Used to reflect the impact of grounding materials and resistance reduction measures on grounding electrical performance, such as material impedance, conductivity, thermal stability, and resistance reduction effect; R i Used to calculate impedance in various engineering areas; K ci The level of safety requirements for each engineering area is determined by factors such as equipment density, equipment voltage level, and personnel density; k' Fi This is used for subsequent detailed scheme adjustments and modifications to the electrical performance of the preliminary scheme. The default value in the preliminary scheme calculation is 1.

[0110] ③ Durability weighting coefficient formula

[0111]

[0112] In the formula, i is the region number of the engineering part, K3 is the weight ratio adjustment coefficient, and K aiB represents the durability coefficient of the grounding materials in each engineering area. i k' represents the corrosion coefficient for each engineering area. Li These are durability performance adjustment coefficients after detailed design schemes for each region. K3 is determined based on weighted coefficients and is used to adjust the calculation results to achieve a weighted coefficient sum 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 / alkalinity and pollution level of the local soil and water. Li This is used to adjust and modify the durability performance of the grounding material in the preliminary scheme for subsequent detailed schemes. The default value in the preliminary scheme calculation is 1.

[0113] S7. Input or adjust the regional resistance reduction measure adjustment coefficient according to the situation of each region. The higher the coefficient ratio, the more difficult it is to implement the detailed grounding algorithm for the subsequent region and the higher the investment cost, but the better the electrical performance of the grounding grid in the project area. At the same time, the resistance reduction measure coefficient will affect the weighting coefficient ratio of the entire power station. The grounding calculation data database contains preset resistance reduction measure adjustment coefficients for each region of each level of hydropower project.

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

[0115] Taking the grounding resistance calculation of the above reservoir, water 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 following formula:

[0116]

[0117] In the formula ρ s Let k be the resistivity of the river water. s Calculate the adjustment coefficient for reservoir resistance and The value is related, where S is the area of ​​the upper reservoir.

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

[0119] R2=α1R e2

[0120]

[0121] In the formula R e2α1 is the equivalent grounding resistance value of the artificial grounding grid for the water diversion tunnel compared to the square grounding grid; α2 is the equivalent conversion coefficient of the grounding grid; S is the total area of ​​the grounding grid laid in the water diversion tunnel; d is the diameter or equivalent diameter of the horizontal grounding body in the water diversion tunnel; h is the average burial depth of the grounding grid in the water diversion tunnel; L0 is the total length of the outer edge of the grounding grid in the water diversion tunnel; L is the total length of the horizontal grounding body in the grounding grid of the water diversion tunnel.

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

[0123] Similarly, relevant formulas can be used to calculate the R1 to R2 areas of each engineering zone of the power station. n The grounding impedance value is used to calculate R in parallel. total Calculated value of the power station's total grounding grid.

[0124] S9. Using the shielding coefficient between regional grounding grids and the corresponding calculation formula, complete the parallel calculation of the grounding grids in all areas of the station to obtain the preliminary design value of the power station's total grounding grid. The calculation is briefly described below:

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

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

[0127] In the formula, n is the power station project area number; R total R is the calculated value of the power station's total grounding grid. n The calculated resistance value for the engineering part, k n The shielding coefficient is calculated in parallel between the grounding grids in various areas of the project; / / is the symbol for parallel impedance calculation. When calculating in parallel, the connection sequence of the grounding grids in each area of ​​the project should be followed for both parallel connection and shielding coefficient calculation. For example, if the actual project layout involves connecting the grounding grid of the upper reservoir to the grounding grid of the water diversion tunnel, and then to the grounding grid of the underground powerhouse, then k1R1 / / k2R2 / / k3R3 should be calculated in parallel according to the sequence. The calculated grounding impedance value for the entire power station is obtained using this method. Where R... n The impedance calculation formula varies depending on the location of the project.

[0128] S10. Compare the calculated total grounding grid resistance requirement with the calculated value of the preliminary design scheme for the entire grounding system. If the total resistance value of the preliminary design scheme is greater than the required total grounding grid resistance, it is considered non-compliant. The algorithm automatically returns to step S6 to modify the weighted array, gradually increasing the weighting coefficient ratio of electrical indicators by region to regenerate the scheme. If the total resistance value of the preliminary design scheme is less than the required total grounding grid resistance, it is considered compliant. However, if the proportion of the economic weighting coefficient is lower than a certain indicator, the algorithm will consider it necessary to adjust and automatically return to step S6 to modify the weighted array to optimize the grounding design scheme. The weighting coefficient ratio of economic indicators is gradually increased by region until the optimal grounding design scheme is obtained and confirmed, then proceed to step S11. The formula for the priority coefficient of the grounding design scheme adjustment for the engineering area is:

[0129]

[0130] In the formula, i is the area number of the engineering part, and S i V represents the area of ​​the grounding grid laid for each project. ai The average area price of grounding materials in each project area, V bi K represents the average area price of grounding technology and related equipment. s For regional security requirements level, P s K represents the probability of electrical accidents occurring in a region, reflecting the likelihood of electrical accidents such as equipment short circuits, lightning strikes, and misoperation occurring in the region during past engineering operations. ci The higher the level of the engineering part, the higher the priority of the grounding scheme adjustment. As can be seen from the formula, 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 of the engineering area. This priority setting is used to adjust the area with the greatest impact on the cost of the grounding system first, while ensuring the safety and reliability of the grounding system.

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

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

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

[0134] S1. Based on the parameters provided by the preliminary grounding plan for the entire station, generate 3D models of the main grounding electrodes, branch grounding electrodes, and other auxiliary grounding materials for each area in the 3D BIM model. During 3D model generation, the actual conditions of the civil engineering structure and terrain model will be considered to avoid unreasonable grounding electrode layout schemes, and to ensure effective connections between grounding electrodes and between grounding electrodes and protection equipment in 3D space. Furthermore, upon receiving an adjustment command, the types and layout schemes of the generated models will be adjusted according to the modification of the weighting coefficients.

[0135] S2. Divide the grounding grid model within each engineering area into sub-regions. Based on the arrangement of grounding electrodes and the connection of grounding equipment within each sub-region, parameterize data such as grounding material impedance, natural grounding conditions, and equivalent adjustment coefficients. According to the series and parallel connections between grounding electrodes and grounding equipment, calculate the grounding impedance values ​​within the corresponding sub-region segment by segment from the edge of the grounding grid, and record and label these values ​​for each sub-region. Obtain the calculated grounding impedance values ​​for each sub-region and the detailed calculated impedance values ​​for the overall grounding grid of the project area.

[0136] During the calculation, the grounding grid is divided into sub-regions A1 to A2 along its edge. n Each sub-region should include at least one grounding grid hole. Then, based on the material's electrical properties, length, and series / parallel connections, calculate the grounding grid resistance within each region. Afterward, based on the number of connection points between the grounding grids of adjacent sub-regions, incorporate the grounding grid impedance of this region into the overall impedance calculation. Figure 4 The connection points between regions A1 and A2 are marked as 1 and 2. When calculating the regional impedance from the perspective of region A2, the impedance of region A1 is considered as the impedance value between connection points 1 and 2, and the parallel calculation is used to obtain the impedance value of region A2. Similarly, the connection points between regions A1 and A3 are marked as 3, 4, and 5. When calculating the regional impedance from the perspective of region A3, the impedance of A1 is considered as the impedance value between connection points 3, 4, and 5, and the parallel calculation is used to obtain the impedance value of region A3. This process is repeated to complete the calculation of the impedance of all sub-regions, so as to obtain the overall impedance value of the regional grounding grid of this project and the internal impedance calculation value of each sub-region.

[0137] S3. The algorithm will recommend and preset solutions based on the characteristics of each region and the standard schemes stored in the corresponding scale and region in the grounding calculation data database. After selecting and confirming the auxiliary grounding resistance reduction measures that can be taken, the algorithm will generate the layout scheme of the region in the 3D model according to the corresponding measure scheme data, and incorporate the impedance impact of the measures into the sub-region grounding calculation in a parameterized form. It will adjust and modify the impedance impact of each measure on the grounding network of each sub-region, and update the calculation to obtain the impedance value of the grounding network of each region after adopting 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] In the formula, n is the power station project area number, and zn is the grounding grid sub-area number within a certain project area; R` n This represents the adjusted impedance values ​​for various engineering components, such as the resistance value of the underground powerhouse area; / / is the symbol for impedance parallel calculation; k zn R is the comprehensive coefficient for grounding resistance reduction and shielding measures in each sub-area of ​​the grounding grid. zn Calculate the impedance value for the sub-region of the grounding grid; k j To increase the grounding electrode adjustment coefficient; R j To increase the parallel impedance of the grounding electrode.

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

[0141] S4. The algorithm compares and judges whether the impedance values ​​of the grounding grids in each area obtained after detailed adjustments meet the requirements of the grounding impedance in each area in the preliminary grounding scheme of the whole station. If the impedance values ​​are higher than the requirements, it is considered non-compliant. The algorithm will automatically return to step S1 to modify the parameters and scheme details such as the selection of grounding materials, detailed layout scheme, and resistance reduction measures in the area. During the modification, the system will automatically adjust the priority coefficient according to the design scheme of each sub-area to gradually expand the modification range of the grounding grid sub-area, and gradually increase the factors that affect the electrical parameters in the layout scheme until the optimal solution is obtained. If the impedance values ​​are lower than the requirements, it is considered compliant. The algorithm will then continue to step S5.

[0142] S5. Based on the electrical parameters corresponding to the current area grounding design scheme and the model layout in the 3D environment provided in step S4, perform verification calculations for contact potential, step potential, and impulse electromotive force. If any verification calculation fails to meet the verification conditions, it is considered non-compliant, and the system automatically returns to step S1 to modify parameters and scheme details such as the selection of grounding materials, detailed layout scheme, and resistance reduction measures within the area; if all verification calculations meet the requirements, it is considered compliant, and the process continues to step S6.

[0143] S6. Call the grounding design specifications of the corresponding engineering part in the grounding calculation data database to judge, such as: various electromotive force parameters, regional grounding impedance, grounding grid layout scheme, grounding electrode layout implementation details, etc., and verify whether the various electrical indicators meet the requirements. If they do not meet the requirements, automatically return to step S1 to modify the relevant parameters in the design scheme step by step; if they meet the requirements, continue to step S7.

[0144] S7. Based on the revised detailed grounding scheme for the region, adjust the weighting coefficients of each indicator, and determine whether the weighting percentages of the electrical, economic, and durability coefficients are within the limits of the preliminary design scheme, and whether each weighting coefficient meets the relevant limiting conditions. If not, it is considered non-compliant, and the weighting coefficients are gradually modified and the process returns to step S1 to modify the regional grounding network design scheme step by step. The main method during the modification process is to adjust the priority coefficients according to the design scheme of each sub-region of the grounding network, modify the grounding materials and verify each indicator of each sub-region of the grounding network generated in the previous steps for this project. Through refined calculation and material selection for each sub-region, the grounding network of the project area is divided more meticulously, enabling a design scheme composed of multiple grounding materials within the same region to meet the requirements of the optimal grounding design scheme. The grounding design scheme can be quickly generated and constrained through the weighting coefficients. If each weighting coefficient meets the requirements of the preliminary design scheme and relevant limiting conditions, it is considered compliant, and step S8 is continued. The calculation formula for the adjustment coefficients of each indicator after the detailed design scheme is generated is as follows:

[0145]

[0146] In the formula, i is the area number of the engineering part; k' E A represents the economic adjustment coefficients after detailed design plans for each region. price The preliminary grounding design scheme includes the calculated implementation price of the grounding system in this area; A' price The price calculation value for the grounding system in this area after the detailed design scheme was adjusted.

[0147]

[0148] In the formula, i is the area number of the engineering part; k' Fi R is the adjustment factor for the electrical performance of the grounding grid after detailed design schemes for each region. i The preliminary grounding design scheme includes the calculated impedance value of the grounding system for this part of the project, R'. i The calculated values ​​of the grounding system impedance for this part of the project are based on the adjusted detailed design scheme.

[0149]

[0150] In the formula, i is the area number of the project section, zi is the sub-area number of the grounding grid within this project section; k' Li K is the adjustment factor for the durability performance of grounding materials after detailed design schemes for each area. zi S represents the durability performance coefficient of the grounding material in each sub-area within this project section. zi Calculate the grounding grid area for each sub-area within this project section; S n K represents the total area of ​​the grounding grid in this project area. aiThis refers to the durability coefficient of the grounding material in this area during the preliminary design phase.

[0151] The formula for calculating the priority coefficient of the design scheme adjustment for each sub-region of the grounding grid in the engineering section is as follows:

[0152]

[0153] In the formula, zi is the sub-area number of the grounding grid within a certain engineering section, and S zi V represents the area of ​​the grounding grid sub-region; azi The average area price of grounding materials for each sub-area of ​​the grounding grid, V bzi K represents the average area price of grounding technology and supporting equipment for each sub-area of ​​the grounding grid; zi n represents the safety requirement level coefficient for grounding equipment within each sub-area of ​​the grounding grid. zi Number of devices requiring grounding within each grounding grid sub-area; d zi This represents the minimum distance between the main grounding electrode and the grounding equipment within each sub-region of the grounding grid. When the distance is less than 1 meter, it is calculated as 1 meter to obtain a design safety margin. It can be seen from the formula that sub-regions with higher implementation costs, fewer and farther-ranging equipment within the grounding grid, and lower equipment safety requirements are given priority for material adjustments. The goal of this priority setting is to prioritize detailed modifications to the sub-region grounding grid design scheme in the detailed design scheme while ensuring safety, and to maintain overall consistency with the preliminary design scheme as much as possible.

[0154] S8. Based on the adjustments and calculation results of the above steps, generate detailed grounding schemes for each area, generate three-dimensional models of the grounding design, and end the algorithm flow for generating detailed grounding schemes for each engineering area.

[0155] (V) Grounding Calculation Data Database

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

[0157] (vi) Grounding Design Result Generation Module

[0158] The grounding design deliverables generation module includes sub-modules for generating grounding calculation reports, generating regional grounding electrode layout diagrams, and generating grounding material statistical tables. It generates various deliverables by organizing, statistically analyzing, and calculating the main calculation results and key technical indicators from each step of the algorithm process within the 3D model of various grounding materials. The module also includes standardized template files for grounding calculation reports, 3D grounding electrode layout diagrams, and grounding material statistical tables. Through data organization and data collection, and by pre-setting the cropping angles of each layout diagram in 3D space, it can quickly generate various grounding design deliverables.

[0159] The following example, using the design of a grounding scheme for a hydropower project as an example, illustrates the implementation method of the hydropower project grounding auxiliary design system of the present invention:

[0160] Step 1: Based on relevant requirements and specifications, develop and test the application functions and supporting algorithms of the grounding auxiliary design system for hydropower projects. Simultaneously, construct the grounding calculation data database and install and deploy the program on the designers' computers. Also, prepare unmanned aerial vehicle (UAV) 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 scan 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 each key building and equipment 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 within the grounding auxiliary design system platform. Utilize the resistivity intelligent identification submodule within the engineering grounding model reading module to identify and annotate the resistivity of the entire station's terrain model. Simultaneously, use the power station model data analysis submodule to read and organize the data contained in the entire station's engineering BIM model, and use program functions to complete the division of the engineering grounding system area.

[0164] Step 5: Using the auxiliary functions of the power station grounding design preliminary scheme generation module, the corresponding algorithm, and the data in the grounding calculation data database, calculate and generate the preliminary scheme of the power station grounding system. Automatically adjust the weighting coefficients of the preliminary schemes for each area and the power station as a whole until the optimal solution of the preliminary grounding design scheme is obtained, and obtain the grounding impedance requirements for each engineering area, the selection of the main grounding bodies for each area, and the related preliminary scheme layout.

[0165] Step 6: Utilize the auxiliary functions of the detailed grounding scheme generation module for each engineering area, the corresponding algorithms, and the data in the database to calculate and generate detailed grounding design schemes for each area of ​​the power station. Generate detailed models of the grounding grid for each area in three-dimensional space. Use the module's functions to analyze and calculate the grounding impedance of each sub-area of ​​the grounding grid and check the results according to the program flow. Use weighted coefficient groups to automatically adjust and check the grounding scheme, material selection, and resistance reduction measures for each sub-area of ​​the grounding grid until the optimal detailed design scheme for each area's grounding grid is obtained.

[0166] Step 7: Utilize the operational procedures and template requirements of the grounding design results generation module to generate the grounding calculation report, regional grounding electrode layout diagram, and grounding material statistics table. Export the relevant data as electronic design deliverables for on-site construction use.

[0167] This invention provides a new auxiliary design method for the electrical grounding system design of hydropower projects by integrating technologies such as 3D engineering visualization, BIM modeling, AI recognition, and automatic analysis and calculation of engineering data. It improves the efficiency of grounding system design through digital means and uses corresponding algorithms to find the optimal solution for grounding design in terms of safety and project cost within a short time. The method can quickly generate design schemes, reports, statistical data, etc., greatly improving the efficiency of processes such as scheme design and adjustment, budget quotation, report writing, and detailed design. Furthermore, the segment-by-segment, point-by-point grounding calculation method provides more reliable and accurate grounding safety calculation data than traditional design methods, resulting in a more accurate, reliable, and economical grounding design scheme.

[0168] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A grounding auxiliary design system for hydropower projects, characterized in that, It includes a data-connected engineering grounding model reading module, a power station grounding design preliminary scheme generation module, a detailed grounding scheme generation module for each engineering area, a grounding design result generation module, and a grounding calculation data database; The engineering grounding model reading module includes a power plant geographic model scanning device, an engineering model import and integration sub-module, a resistivity intelligent identification sub-module, and a power plant model data analysis sub-module. This is used to obtain a geographic model of the actual area of ​​the hydropower project, identify grounding design-related data, and import the identified and marked engineering model into the power station grounding design preliminary scheme generation module. The power station grounding design preliminary scheme generation module includes a whole-station grounding overall scheme analysis submodule, a whole-station grounding preliminary scheme generation submodule, and a whole-station grounding overall scheme weighted calibration submodule. The preliminary grounding design scheme for hydropower station was generated and calibrated using grounding design scheme generation algorithms, supporting application functions, and data. The detailed grounding scheme generation module for each engineering 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. Using the grounding design scheme generation algorithm and its supporting application modules and data, the grounding scheme and layout are gradually adjusted and calibrated to finally generate detailed grounding design schemes and three-dimensional layout models of grounding bodies for each engineering area. The grounding calculation data database stores various grounding layouts and calculation processes, including electrical and price data for various grounding materials, geographical electrical parameters such as soil and river water resistivity under various conditions, lightning strike frequency at various altitudes in different regions, various index parameters and limiting parameters that grounding design must be based on in hydropower codes, grounding grid shape and electrical parameter curve data, grounding parameter index requirements for various types of electrical equipment, and reference values ​​of preset weight coefficient groups for various scales and regions of the project. It is used to provide data support for the engineering grounding model reading module, the power station grounding design preliminary scheme generation module, and the detailed grounding scheme generation module for each engineering area. The grounding design results generation module includes a grounding calculation report generation module, a regional grounding electrode layout diagram generation module, and a grounding material statistics table generation module. These modules are used to organize and statistically analyze the grounding design schemes and models generated by each module, forming various result documents.

2. The grounding auxiliary design system for hydropower projects according to claim 1, characterized in that, The power station geographic model scanning equipment is a surveying drone carrying multiple high-definition oblique photography cameras, used to scan the power station engineering area to obtain a high-precision engineering geographic information model, providing a model basis for analysis and calculation in the power station grounding design preliminary scheme generation module and the detailed grounding scheme generation module for each engineering area; The engineering model import and integration submodule is used to import the geospatial information model of the power station area obtained by scanning, as well as the engineering BIM design models of hydraulic structures, building structures, electromechanical and metal structure equipment, into the power station grounding design preliminary scheme generation module, and to integrate the coordinates of each professional model to make it a complete hydropower station BIM model, and each professional model must contain the corresponding standard BIM model information. The resistivity intelligent identification submodule is used to intelligently identify the geographical images and model information of the power station obtained by oblique photography, so as to analyze and judge the soil and river water resistivity in each area of ​​the power station, and assign relevant attribute data to the geographical model of the corresponding area, providing the necessary data support for the generation of design schemes for the power station grounding design preliminary scheme generation module and the detailed grounding scheme generation module for each engineering area. The power station model data analysis submodule is used to organize and identify the data of the entire station's engineering BIM model. According to design and construction habits and project progress management requirements, the engineering model is divided into regions. The submodule automatically measures and adds model attributes to various data in each engineering region that may have an electrical impact on the later grounding design scheme. This provides the necessary data support for the generation of design schemes for the power station grounding design preliminary scheme generation module and the detailed grounding scheme generation module for each engineering region.

3. The grounding auxiliary design system for hydropower projects according to claim 1, characterized in that, The overall grounding scheme analysis submodule of the entire station utilizes BIM model data and the data of the short-circuit current calculation parameters of the entire station, as well as related algorithms, to analyze, calculate, and preliminarily organize the grounding calculation data of the entire power station. Through calculation and organization, it obtains the design requirement value of the total grounding resistance value of the power station, the grounding design weighting coefficient group of each area, the shielding coefficient between the grounding grids of each area, the usable grounding grid area of ​​each area, the grounding environmental conditions of each area, and the grounding design constraints and special index requirements of each area as supporting data required for further scheme generation by the detailed grounding scheme generation module of each engineering area. The submodule for generating the preliminary grounding scheme for the entire station will call the preliminary grounding scheme generation algorithm to generate the preliminary grounding scheme for the entire station. It provides a visual working interface and interactive functions for the algorithm. According to the algorithm sequence, the designer interacts with the operator to complete the input, reading, confirmation and result judgment of the design data for each step, generate the preliminary grounding scheme for the entire station, and provide a corresponding interface to view the calculation methods and data results of each design step. The weighted calibration submodule for the overall grounding scheme of the entire station includes a method for modifying and adjusting the weighted coefficients of the overall grounding design. It defines and constrains the characteristics of the design scheme with indicators of electricality, economy, and durability, and calls the preliminary grounding scheme generation algorithm to complete the automatic calibration and adjustment of the preliminary grounding scheme of the entire station until the optimal preliminary design scheme is obtained. At the same time, it provides a visual working interface for the algorithm, and displays the impact of each adjustment scheme on the design indicators in the interface.

4. The grounding auxiliary design system for hydropower projects according to claim 1, 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 based on the grounding design scheme calculated in each step, and adjusts and statistically analyzes the arrangement of each grounding body and grounding auxiliary materials in the model according to the actual situation and subsequent adjustment commands. The detailed grounding scheme generation submodule for each engineering area will call the detailed grounding scheme generation algorithm to generate detailed grounding design schemes for each engineering area of ​​the power station. It provides an interface and functions to view the generated grounding body model in a 3D model environment, and completes relevant grounding calculations to generate detailed grounding design schemes for each area. It also provides an interface that allows designers to interact with and view the calculation methods and results of each step. The weighted calibration submodule for the detailed grounding design scheme of the region will call the algorithm for generating the detailed grounding design scheme of the region and adjust each sub-region of the grounding network of each engineering part segment by segment. At the same time, the weighting coefficient will be further automatically adjusted at the decimal level to obtain the optimal design scheme. The calibration and generation of the detailed grounding design scheme of the entire station will be completed, and a visual working interface will be provided for the algorithm to view and adjust. Finally, the detailed grounding scheme of each region will be confirmed and a three-dimensional model will be generated.

5. The grounding auxiliary design system for hydropower projects according to claim 1, characterized in that, The aforementioned preliminary grounding scheme generation submodule and detailed grounding scheme generation submodule for each engineering area include sub-algorithms for calculating, arranging, verifying, adjusting, and judging grounding schemes using BIM models and associated information. The calculation methods and application functions are combined according to the design process requirements. The algorithm steps are as follows: First, in the preliminary grounding scheme generation algorithm, the BIM model's recognition function and grounding design index calculation formulas are used to calculate and generate the preliminary grounding network scheme for the entire station and various foundation design index parameters. Then, in the detailed grounding scheme generation algorithm for each engineering area, the design materials and schemes for each engineering sub-area are calculated segment by segment to obtain and verify the results. Based on various design indicators, detailed and reasonable grounding schemes for each engineering area are obtained. In the above process, the priority coefficients of the grounding design schemes for the engineering area and its sub-areas are set for optimization and ranking. When optimizing the scheme, the weighting system of each indicator is adjusted to constrain and judge the optimization method of the refined grounding grid selection scheme for the engineering area and its sub-areas, and finally obtain the design scheme with the best safety and cost factors. Specifically, this includes setting weighting coefficients for three indicators: electrical performance, economy, and durability. The weighting coefficients are used to define and constrain the grounding design scheme, and the grounding design scheme is automatically adjusted until the optimal design scheme is obtained by adjusting the proportion of the weighting coefficients of each indicator step by step. The formula for the economic weighting coefficient is as follows: In the formula, K1 is the weight ratio adjustment coefficient, K ai K represents the price coefficient for grounding materials used in each engineering area in the preliminary plan. bi A represents the price coefficients for grounding construction techniques and components used in each project area in the preliminary plan. i This refers to the amount of grounding grid material used in each area according to the preliminary plan. Economic adjustment coefficients after detailed design plans for each region; The formula for the electrical weighting factor is: In the formula, i is the region number of the engineering part, K2 is the weight ratio adjustment coefficient, and R req This is the required value for the total grounding grid resistance of the power station. R total K is the calculated value of the power station's total grounding grid. ai K represents the electrical performance coefficient of the grounding material in the preliminary schemes for each engineering area. bi R is the adjustment coefficient for grounding resistance reduction measures in the preliminary scheme of each project area. i K represents the calculated impedance value for each engineering area. ci k' is the regional security level coefficient. Fi This refers to the electrical performance adjustment factor after detailed design schemes for each area; The formula for the durability weighting factor is: In the formula, K3 is the weight ratio adjustment coefficient, K ai B represents the durability coefficient of the grounding materials in each engineering area. i k' represents the corrosion coefficient for each engineering area. Li For durability performance adjustment factors after detailed design schemes for each region; The priority coefficients for adjusting the grounding design schemes for each project area are as follows: In the formula, i is the area number of the engineering part, and S i V represents the area of ​​the grounding grid laid for each project. ai The average area price of grounding materials in each project area, V bi K represents the average area price of grounding technology and related equipment. s For regional security requirements level, P s The probability of an electrical accident occurring in the area; Priority coefficients for adjusting the design schemes of each sub-area of ​​the grounding grid in each engineering section: In the formula, zi is the sub-area number of the grounding grid within a certain engineering section, and S zi V represents the area of ​​the grounding grid sub-region; azi The average area price of grounding materials for each sub-area of ​​the grounding grid, V bzi K represents the average area price of grounding technology and supporting equipment for each grounding grid resistance area; zi n represents the safety requirement level coefficient for grounding equipment within each sub-area of ​​the grounding grid. zi Number of devices requiring grounding within each grounding grid sub-area; d zi This refers to the minimum distance between the main grounding electrode and the grounding equipment within each sub-area of ​​the grounding grid.

6. The grounding auxiliary design system for hydropower projects according to claim 5, characterized in that, The preliminary grounding scheme generation submodule is specifically used for: S1. Read or input the maximum short-circuit current value flowing through the grounding neutral point of the power plant and substation when the maximum single-phase ground fault occurs in the electrical design pre-process. S2. Based on the basic electrical parameters of the power station provided by S1, calculate the required value of the total grounding grid resistance of the power station; S3. Call the engineering grounding model reading module to identify and mark the engineering BIM model in each sub-module, and import the model into the power station grounding design preliminary scheme generation module program; S4. Read the resistivity data of each engineering area from the BIM model auxiliary information imported in step S3; S5. Read the spatial data from the BIM model auxiliary information imported in step S3, and calculate the spatial parameters of various grounding systems in each area, including the effective grounding grid area, the equivalent dimensions of the natural grounding grid, and the shielding coefficient between the grounding grids in the area. S6. Read the preset weighted coefficient group for the entire station and each engineering area from the grounding calculation data database. The algorithm will perform preliminary grounding design scheme calculation based on the proportion of each coefficient of electrical, economic and durability in the weighted array to match the configured scheme with the adjustment coefficients of each index. When the return adjustment command of step S10 is received, the weights will be adjusted step by step as needed to find the optimal design scheme. S7. Input or adjust the regional resistance reduction measure adjustment coefficient according to the situation in each region; S8. Using the built-in calculation formulas for various indicators of hydropower projects, the various parameters calculated in steps S4 and S5, the grounding scheme configuration results in step S6, and the various general grounding calculation parameters stored in the grounding calculation data database, the preliminary design resistance value of the grounding grid in each area of ​​the power station is automatically calculated. S9. Using the shielding coefficient between regional grounding grids and the corresponding calculation formula, perform parallel calculations on the grounding grids of each region of the entire station obtained in step S8 to obtain the preliminary design value of the power station's total grounding grid. S10. Compare the required total grounding grid resistance value of the power station obtained in step S2 with the calculated value of the preliminary design scheme of the entire grounding system obtained in step S9. If the total resistance value of the preliminary design scheme is greater than the required total grounding grid resistance value of the power station, it is considered non-compliant. Then, the algorithm will automatically return to step S6 to modify the weighted array and increase the weighting coefficient ratio of the electrical indicators by region to regenerate the scheme. If the total resistance value of the preliminary design scheme is less than the required total grounding grid resistance value of the power station, it is considered compliant. However, if the proportion of the economic weighting coefficient is lower than a certain indicator, the algorithm will consider it to need adjustment and will automatically return to step S6 to modify the weighted array to optimize the grounding design scheme. The weighting coefficient ratio of the economic indicators will be increased by region by region until the optimal grounding design scheme is obtained and confirmed. Then, the algorithm will continue to step S11. S11. Generate a preliminary design scheme for the entire station grounding based on the calculation and adjustment results, organize the relevant result data, and end the algorithm flow for generating the preliminary design scheme for the entire station grounding.

7. The grounding auxiliary design system for hydropower projects according to claim 5, characterized in that, The detailed grounding scheme generation submodule for each engineering area is specifically used for S1. Read the preliminary grounding scheme and parameters of the entire station provided by the power station grounding design preliminary scheme generation module, and generate three-dimensional models of the main grounding body, branch grounding body and various auxiliary grounding materials 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 types and layout schemes of the generated models will be adjusted according to the modification of the weighting coefficient. S2. Divide the grounding grid model in each engineering area into sub-regions. Based on the preliminary grounding layout scheme in each sub-region in step S1, calculate the grounding impedance of each sub-region segment by segment from the edge of the grounding grid and obtain the detailed calculation value of the overall resistance of the grounding grid in this engineering area. S3. The algorithm will recommend and preset the standard schemes stored in the corresponding scale and area of ​​each region based on the characteristics of each region and the grounding calculation data database. It will select and confirm the auxiliary grounding resistance reduction measures that can be taken, and generate the layout scheme of the region in the three-dimensional model according to the corresponding measure scheme data. Based on step S2, it will adjust the grounding impedance calculation value of each sub-region. S4. The algorithm will compare and judge whether the impedance values ​​of the grounding grids of each area obtained after the adjustment in step S3 meet the requirements of the grounding impedance of each area in the preliminary grounding scheme of the whole station. If the impedance values ​​are higher than the requirements, it is considered not to meet the requirements, and the algorithm will automatically return to step S1 to modify the selection of grounding materials, detailed layout scheme, resistance reduction measures parameters and scheme details in the area. If the impedance values ​​are lower than the requirements, it is considered to meet the requirements, and the algorithm will continue to step S5. S5. Based on the current area grounding design scheme and the electrical parameters corresponding to the model layout in the 3D environment provided in step S4, perform various potential index parameters verification. If any verification calculation fails to meet the verification conditions, it is considered non-compliant. Then, automatically return to step S1 to modify the selection of grounding materials, detailed layout scheme, resistance reduction measures parameters, and scheme details within the area. If all verification calculations meet the requirements, it is considered compliant and proceed to step S6. S6. Call the grounding calculation data database to check the grounding design specifications for the corresponding engineering parts, and judge the implementation details of the grounding electrode layout in each area after the adjustments in steps S4 and S5. Verify whether the electrical indicators meet the requirements. If they do not meet the requirements, automatically return to step S1 to modify the relevant parameters in the design scheme step by step. If they meet the requirements, continue to step S7. S7. Based on the revised detailed regional grounding scheme in steps S4, S5, and S6, adjust the weighting coefficients of each indicator, and determine whether the weighting percentages of the electrical, economic, and durability coefficients are within the limits of the preliminary design scheme, and whether each weighting coefficient meets the relevant limiting conditions. If not, it is considered non-compliant, and the weighting coefficients are gradually modified and the process returns to step S1 to modify the regional grounding grid design scheme step by step. If each weighting coefficient meets the requirements of the preliminary design scheme and relevant limiting conditions, it is considered compliant, and the process continues to step S8. S8. Based on the adjustments and calculation results of the above steps, generate detailed grounding schemes for each area, generate three-dimensional models of the grounding design, and end the algorithm flow for generating detailed grounding schemes for each engineering area.

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