A wind power tower grounding resistance on-line detection system

Abstract

The present application relates to the technical field of grounding resistance measurement, and discloses a wind power tower grounding resistance online detection system, which comprises a measurement module, a construction module, a data processing module, a fault troubleshooting module and a warning module.The measurement module is connected with a current feed-in point, a voltage detection point and a ground net welding point in the power grid of the wind power tower through a grounding resistance measuring instrument.The construction module constructs a power grid model and imports the measurement information of the measurement module into the power grid model.The data processing module is used for analyzing the processing data of the measurement module, uploading to the power grid model and sending abnormal values to the fault troubleshooting module.The fault troubleshooting module is used for troubleshooting and marking abnormal grounding resistance values occurring in the data processing module.The warning module is used for warning abnormal values marked by the fault troubleshooting module, which can better plan, design and maintain the grounding system of the wind power tower and ensure excellent performance in electrical safety, lightning protection and system reliability.This helps to improve the operation efficiency and safety of the wind power tower and reduce potential risks and faults.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grounding resistance detection, in particular to a wind power tower grounding resistance online detection system. BACKGROUND

[0002] Grounding is to connect some points of buildings, some parts of electrical equipment, and some points of power systems with the ground. Its role is to provide a discharge path for fault current and lightning current, stabilize the potential, provide a zero potential reference point, and ensure the normal and safe operation of power systems, electrical equipment, and electronic equipment, and the personal safety of operating personnel and other personnel. Grounding can be classified into working grounding, protective grounding, lightning protection grounding, and signal reference ground. Grounding functions are realized through grounding devices or grounding systems.

[0003] The parameter representing the electrical performance of a grounding device or a grounding system is the grounding resistance. The size of the grounding resistance reflects the ability of the grounding device or the grounding system to dissipate fault current and lightning current and the protection performance. The smaller the grounding resistance value, the higher the ability to dissipate fault current and lightning current, and the better the protection performance. However, for areas with high soil resistivity, the investment is also larger. Therefore, the positioning of the grounding resistance value is of great significance to the investment, normal and safe operation of wind turbine generators, and personal safety of wind power plants.

[0004] Currently, grounding resistance usually changes after grounding due to changes in soil and environment, and may not be ideal due to line aging and other issues, which can cause great safety hazards to actual production. Therefore, in order to better plan, design, and maintain the grounding system of a wind power tower, ensure its excellent performance in electrical safety, lightning protection, and system reliability, and improve the operating efficiency and safety of the wind power tower while reducing potential risks and failures, the present application provides a wind power tower grounding resistance online detection system. SUMMARY

[0005] The purpose of the present application is to better plan, design, and maintain the grounding system of a wind power tower, ensure its excellent performance in electrical safety, lightning protection, and system reliability, and improve the operating efficiency and safety of the wind power tower while reducing potential risks and failures.

[0006] To achieve the above purpose, the present application provides a wind power tower grounding resistance online detection system, which comprises:

[0007] A measurement module connected to a current feed-in point, a voltage detection point, and a ground net welding point in the power grid of the wind power tower, and measuring the processing data of the current feed-in point, the voltage detection point, and the ground net welding point;

[0008] A construction module for constructing a power grid model and importing the processing data into the power grid model.

[0009] a data processing module configured to analyze the processing data, display normal values on an established power grid model, and send abnormal values;

[0010] a troubleshooting module configured to troubleshoot abnormal grounding resistance values corresponding to the abnormal values, and mark the abnormal grounding resistance values on the established power grid model;

[0011] an early warning module configured to early warn the abnormal values marked by the troubleshooting module, and send the abnormal grounding resistance information to a cloud platform.

[0012] Preferably, the measurement module is specifically configured to:

[0013] The measurement module is configured to access a current feeding point and a ground net welding point to measure the resistance value of a grounding electrode or a ground net, and measure the grounding resistance value by applying a current and measuring a generated voltage.

[0014] The measurement module is configured to measure the resistance value of a line after connecting the current feeding point and a voltage detection point, to detect the conduction condition of the line, the quality of wire connection, and the overall resistance of the line.

[0015] The measurement module is configured to measure the grounding resistance and the line resistance to evaluate the quality and performance of the ground net.

[0016] The measurement module is configured to detect abnormal voltage or abnormal current after connecting the voltage detection point and the ground net welding point, and send the abnormal voltage or abnormal current to the collection module.

[0017] Preferably, the construction module is specifically configured to:

[0018] The construction module is configured to determine specific data of a grounding electrode and soil, and establish a grounding resistance model.

[0019] For example, if the electrode is vertical, a formula can be used to calculate the resistance of the vertical grounding electrode: R=(p*L) / A, where R is the grounding resistance, p is the soil resistivity, L is the length of the electrode buried in the soil, and A is the cross-sectional area of the electrode.

[0020] The construction module is configured to collect power grid data of electric elements such as generators and transformers, draw a physical model diagram of the power grid, and use the concepts of nodes and edges to represent the connection relationship between various components in the power grid.

[0021] The construction module is configured to establish a node table, and list all nodes in the power grid and their connection relationship.

[0022] Further preferably, the node table usually includes the name of the node, the voltage level, the connected element, and other information.

[0023] The construction module is configured to establish a branch table: listing all branches (lines, transformers, switches, etc.) in the power grid, as well as their connection nodes and parameter information.

[0024] Further preferably, the branch table generally includes the name of the branch, the starting and ending nodes of the connection, resistance, reactance, and other parameters.

[0025] The construction module is configured to establish a topological relationship: using the node table and the branch table, the topological relationship of the power grid is established. This includes determining the connectivity between nodes, i.e., which nodes are connected by branches.

[0026] Further preferably, commonly used methods include the power flow tracing method (or forward tracing method) and the reverse power flow method for determining sections and loops in the power grid.

[0027] The construction module is configured to determine the type of electrical element in the power grid model, collect parameter data of the electrical element, including resistance, reactance, capacitance, and transformer ratio and leakage reactance; and establish mathematical equations describing the behavior of the element based on the line model and electrical element parameters.

[0028] The construction module can quantify the behavior of electrical elements by establishing mathematical equations and applying them to the analysis and simulation of power systems to better understand the operation and performance characteristics of power systems.

[0029] Preferably, the construction module is specifically used for:

[0030] The construction module is configured to determine the shape and arrangement of the grounding resistance;

[0031] The construction module is configured to determine the resistivity, humidity, salinity, and temperature of the soil;

[0032] The construction module is configured to determine whether the soil is multi-layered soil;

[0033] The construction module is configured to construct a resistance model in combination with the shape and arrangement of the grounding resistance and the information of the soil.

[0034] Preferably, the construction module is further configured to: when it is determined that the soil is multi-layered soil, construct a multi-layered soil model, and correct the calculation of the grounding resistance based on the multi-layered soil model.

[0035] Preferably, the construction of the multi-layered soil model includes:

[0036] Geological exploration and data collection: Among them, the geological exploration includes soil sampling, core collection, rock geophysical exploration, to obtain data about the material composition, structural characteristics and hydrogeological properties of the underground medium; data collection includes collecting existing geological maps, exploration reports, geophysical survey data to obtain information about geological structure, lithology distribution and underground water level.

[0037] Data analysis and interpretation: analyze and interpret the exploration data to obtain the characteristics and changes of the underground medium;

[0038] Stratigraphic division: based on the results of geological data analysis and interpretation, stratigraphic division is carried out. The stratigraphic division is to divide the underground medium into different levels or units, which can describe the stratum more finely when establishing the model; using the theory and method of geology, including lithology, structure, sedimentary characteristics, the underground medium is divided into different stratigraphic units;

[0039] Estimation of electrical property parameters: based on the stratigraphic division of the underground medium, the electrical conductivity, dielectric constant, resistivity

[0040] Stratigraphic model establishment: integrate the stratigraphic division of the underground medium and the estimated electrical property parameters into a stratigraphic model.

[0041] Preferably, the stratigraphic model can adopt one-dimensional, two-dimensional or three-dimensional representation.

[0042] Preferably, the fault diagnosis module corrects the calculated value of the grounding resistance based on the multi-layer soil model to obtain the real resistance value, and if the real resistance value is greater than the first preset resistance threshold and less than the second preset resistance threshold, the warning information is sent to the warning module, which is uploaded to the cloud platform and a first warning signal is issued;

[0043] If the real resistance value is greater than the first preset resistance threshold and greater than the second preset resistance threshold, this information is sent to the warning module, which is uploaded to the cloud platform and a second warning signal is issued.

[0044] The wind turbine grounding resistance online detection system provided by the embodiment of the application has the advantages that the grounding system of the wind turbine can be better planned, designed and maintained to ensure excellent performance in terms of electrical safety, lightning protection and system reliability. This helps to improve the operation efficiency and safety of the wind turbine, while reducing potential risks and failures. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0046] Figure 1 The wind power tower grounding resistance on-line detection system is provided by the embodiments of the present application. DETAILED DESCRIPTION

[0047] The specific embodiments of the present application will be further described in detail below with reference to the drawings and embodiments. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0048] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0049] The terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0050] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0051] As Figure 1As shown, the wind power tower grounding resistance online detection system provided by the embodiment of the application comprises: a measurement module: comprising a grounding resistance measuring instrument connected with a current feeding point, a voltage detection point and a ground network welding point in the power grid of the wind power tower; a construction module: constructing a power grid model and importing the measurement information of the measurement module into the power grid model; a data processing module: used for analyzing the processing data of the measurement module, displaying on the established power grid model and sending the abnormal values to a fault troubleshooting module; the fault troubleshooting module: used for troubleshooting the abnormal grounding resistance values occurring in the data processing module and marking the abnormal values on the established power grid model; and a warning module: used for warning the abnormal values marked by the fault troubleshooting and sending the abnormal grounding resistance information to a data terminal.

[0052] In some embodiments of the application, the measurement module is specifically configured to measure the resistance value of the grounding electrode or the ground network after connecting the current feeding point and the ground network welding point, measure the resistance value of the line after connecting the current feeding point and the voltage detection point, and detect the conduction of the line, the quality of the wire connection and the overall resistance of the line; measure the grounding resistance and the line resistance to evaluate the quality and performance of the ground network; and detect the abnormal voltage or current after connecting the voltage detection point and the ground network welding point, and send the abnormal voltage or current value to the collection module.

[0053] In some embodiments of the application, the construction module is specifically configured to determine the specific data of the grounding electrode and the soil, establish a grounding resistance model; collect the power grid data of the generator, the transformer and the like, draw a physical model diagram of the power grid, use the concept of nodes and edges to represent the connection relationship between various components in the power grid; establish a node table to list all nodes in the power grid and their connection relationship; establish a branch table to list all branches (lines, transformers, switches and the like) in the power grid and their connection nodes and parameter information; and establish a topological relationship by using the node table and the branch table to establish the topological relationship of the power grid. This includes determining the connectivity between nodes, i.e. which nodes are connected by branches. Determine the type of electrical elements in the power grid model, collect the parameter data of the electrical elements, including resistance, reactance, capacitance, transformer ratio and leakage reactance; and establish mathematical equations describing the behavior of the elements according to the line model and the electrical element parameters. By establishing mathematical equations, the behavior of electrical elements can be quantified and applied to the analysis and simulation of power systems to better understand the operation and performance characteristics of power systems.

[0054] When the electrode is vertical, the formula R = (p*L) / A can be used to calculate the resistance of the vertical grounding electrode, where R is the grounding resistance, p is the soil resistivity, L is the length of the electrode buried in the soil, and A is the cross-sectional area of the electrode.

[0055] In the present embodiment, the node table generally includes the name of the node, the voltage level, the connected elements, etc. The branch table generally includes the name of the branch, the connected start and end nodes, the resistance, the reactance, etc. The commonly used method for establishing the topological relationship includes the power flow tracing method (or the forward tracing method) and the reverse power flow method, which are used to determine the section and the loop in the power grid.

[0056] In some embodiments of the present application, the constructing module specifically determines the shape and arrangement of the grounding resistance, determines the resistivity, humidity, salinity and temperature of the soil, determines whether the soil is a multi-layered soil, and constructs the resistance model in combination with the shape and arrangement of the grounding resistance and the information of the soil. When the soil is determined to be a multi-layered soil, the multi-layered soil model is constructed to correct the calculation of the grounding resistance.

[0057] Due to the non-uniform conductivity, composition difference and water content variation of the soil or rock, the difference in the conductivity of different parts will cause the non-uniformity of the current distribution, thereby affecting the measurement result of the resistance. The water content in the soil or rock has a great influence on the resistance. The place with high water content generally has lower resistance, while the place with low water content generally has higher resistance. The soil or rock with different compositions has different conductivities, so the difference in the conductivity of different compositions will also cause the stratum effect when the current passes through the medium.

[0058] Due to the existence of the stratum effect, the result of the direct current resistance measurement can be disturbed, so that there is a difference between the measurement value and the actual resistance value. In order to reduce the influence of the stratum effect, the correction method, the model of the comprehensive stratum characteristics, etc. are commonly used to correct the measurement result.

[0059] Therefore, in the present embodiment, the result of the calculation of the grounding resistance is corrected by constructing the stratum model.

[0060] In this embodiment, the construction of the multi-layer soil model includes: geological exploration and data collection: carry out geological exploration work, including soil sampling, core collection, rock geophysical exploration, etc., to obtain data about the material composition, structural characteristics and hydrogeological properties of the underground medium; collect existing geological maps, exploration reports, geophysical survey data, etc. to obtain information about the geological structure, lithology distribution and groundwater level; data analysis and interpretation: analyze and interpret the exploration data to understand the characteristics and changes of the underground medium; stratigraphic division: based on the results of the analysis and interpretation of the geological data, carry out stratigraphic division. Stratigraphic division is to divide the underground medium into different levels or units so that it can be described more finely when building the model; use the theories and methods of geology, such as lithology, structure, sedimentary characteristics, etc. to divide the underground medium into different stratigraphic units; estimate the electrical property parameters of different stratigraphic units, such as conductivity, dielectric constant, resistivity, etc.; stratigraphic model establishment: integrate the stratigraphic division of the underground medium and the estimated electrical property parameters into a stratigraphic model.

[0061] In this embodiment, the stratigraphic model can be represented in one dimension, two dimensions or three dimensions.

[0062] In some embodiments of the present application, if the calculated value of the grounding resistance is greater than the first preset resistance threshold and less than the second preset resistance threshold after being corrected by the multi-layer soil model, the real resistance value obtained is sent to the warning module, which is uploaded to the cloud platform and a first warning signal is issued. If the calculated value of the grounding resistance is greater than the second preset resistance threshold after being corrected by the multi-layer soil model, the real resistance value obtained is sent to the warning module, which is uploaded to the cloud platform and a second warning signal is issued.

[0063] Further, the first warning signal and the second warning signal of the warning module in this application represent different intensities of the grounding resistance exceeding the preset resistance threshold. The first preset resistance threshold is the normal resistance and the second preset resistance threshold is the dangerous resistance. To avoid the risk to the staff, appropriate protective measures should be taken to repair the grounding resistance.

[0064] In summary, the embodiment of the present application provides an online detection system for the grounding resistance of a wind turbine tower, which can better plan, design and maintain the grounding system of the wind turbine tower, ensuring excellent performance in terms of electrical safety, lightning protection and system reliability. This helps to improve the operating efficiency and safety of the wind turbine tower, while reducing potential risks and failures.

[0065] Those skilled in the art can clearly understand the present application through the description of the foregoing embodiments that the present application can be realized by hardware or by means of software and necessary universal hardware platform. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash disk, a mobile hard disk, etc.), and includes several instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in various implementation scenarios of the present application.

[0066] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for some technical features thereof; and these modifications or replacements do not drive the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An online detection system for grounding resistance of wind turbine towers, characterized in that, include: The measurement module is connected to the current feed point, voltage detection point, and grounding grid welding point in the wind power tower grid, and measures the processed data of the current feed point, voltage detection point, and grounding grid welding point. A construction module is used to build a power grid model and import processed data into the power grid model; The data processing module is used to analyze the processed data, display normal values ​​on the established power grid model, and send out abnormal values. The fault diagnosis module is used to investigate the abnormal grounding resistance values ​​corresponding to the abnormal values ​​and mark the abnormal grounding resistance values ​​on the established power grid model. The early warning module is used to issue early warnings for abnormal values ​​marked in the fault diagnosis and to send abnormal grounding resistance information to the cloud platform. The measurement module is specifically used for: The measurement module is used to connect to the current feed point and the ground grid welding point to measure the resistance value of the grounding electrode or ground grid. The grounding resistance value is determined by applying current and measuring the generated voltage. The measurement module is used to measure the resistance of the line after connecting the current feed point and the voltage detection point, in order to detect the continuity of the line, the quality of the wire connection, and the overall resistance of the line. The measurement module is used to evaluate the quality and performance of the grounding grid by measuring grounding resistance and line resistance; The measurement module is used to connect the voltage detection point and the ground grid welding point to detect abnormal voltage or abnormal current, and send the abnormal voltage or abnormal current to the collection module. The building module is specifically used for: The building module is used to determine the specific data of the grounding electrode and the soil, and to establish a grounding resistance model; The building module is used to collect power grid data of electrical components, draw a physical model diagram of the power grid, and use the concepts of nodes and edges to represent the connection relationship between various components in the power grid; The building module is used to create a node table, which lists all the nodes in the power grid and the connections between all the nodes; The building module is used to create a branch table: listing all branches in the power grid, as well as the connection nodes and parameter information of all branches; The building module is used to establish topology relationships: using node tables and branch tables, the topology relationships of the power grid are established; The construction module is used to determine the types of electrical components in the power grid model, collect parameter data of electrical components, including resistance, reactance, capacitance, and transformer turns ratio and leakage reactance; and establish mathematical equations describing the behavior of components based on the line model and electrical component parameters.

2. The online detection system for grounding resistance of wind turbine towers according to claim 1, characterized in that, The building module is specifically used for: The building block is used to determine the shape and arrangement of the grounding resistor; The building blocks are used to determine soil resistivity, moisture, salinity, and temperature; The building block is used to determine whether the soil is a multi-layered soil; The building blocks are used to construct a resistance model by combining the shape and arrangement of the grounding resistance with soil information.

3. The online detection system for grounding resistance of wind turbine towers according to claim 2, characterized in that, The construction module is also used to: when the soil is determined to be multi-layered soil, construct a multi-layered soil model, and correct the calculation of grounding resistance based on the multi-layered soil model.

4. The online detection system for grounding resistance of wind turbine towers according to claim 3, characterized in that, The construction of the multi-layer soil model includes: Geological exploration and data collection: Geological exploration includes soil sampling, core collection, and rock geophysical exploration to obtain data on the material composition, structural characteristics, and hydrogeological properties of the subsurface medium; data collection includes collecting existing geological maps, exploration reports, and geophysical survey data to obtain information on geological structure, lithological distribution, and groundwater level. Data analysis and interpretation: Analyzing and interpreting exploration data to obtain information on the characteristics and changes of subsurface media; Stratigraphic division: Stratigraphic division is carried out based on the analysis and interpretation of geological data; The stratigraphic division involves dividing the subsurface medium into different layers or units, enabling a more detailed description of the strata when building a model. It utilizes geological theories and methods, including lithology, structure, and sedimentary characteristics, to divide the subsurface medium into different stratigraphic units. Estimation of electrical property parameters: Based on the stratigraphic division of the underground medium, the conductivity, dielectric constant, and resistivity of different stratigraphic units are analyzed and estimated; Stratigraphic model establishment: Integrating the stratigraphic division of the underground medium and the estimated electrical property parameters into a single stratigraphic model.

5. The online detection system for grounding resistance of wind turbine towers according to claim 4, characterized in that, The stratigraphic model can be represented in one-dimensional, two-dimensional, or three-dimensional form.

6. The online detection system for grounding resistance of wind turbine towers according to claim 5, characterized in that, The fault diagnosis module corrects the calculated value of the grounding resistance based on the multi-layer soil model to obtain the actual resistance value. If the actual resistance value is greater than the first preset resistance threshold and less than the second preset resistance threshold, the warning information is sent to the warning module, which then uploads it to the cloud platform and issues the first warning signal. If the actual resistance value is greater than both the first preset resistance threshold and the second preset resistance threshold, this information is sent to the early warning module, which then uploads it to the cloud platform and issues a second early warning signal.

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