A distributed fault location method and system

Abstract

The present invention discloses a distributed fault location method and system, wherein the method includes obtaining node information data of a target power grid, performing simulation modeling on the node information data, obtaining a power topology model of the target power grid, analyzing virtual power lines between nodes in the power topology model, and determining the actual power lines corresponding to the target power grid based on the analysis results; wherein the virtual power lines reflect the connection relationship between any two nodes; and performing fault detection on each actual power line according to the traveling wave fault ranging technology to obtain the inspection fault location point of the target power grid. A distributed fault location method and system provided by an embodiment of the present invention improves the accuracy of traveling wave fault ranging.

Description

Technical Field

[0001] The present invention relates to the technical field of power systems, and in particular to a distributed fault location method and system. Background Art

[0002] With the continuous development of power grid construction, distributed power grid has become the main direction of power industry development. In the power system, it is very important to ensure the stable operation of the power grid. Due to the complex ground conditions for laying power cables, once a fault occurs in the power cables buried underground, it will be difficult to locate the fault point, which brings challenges to the safe and stable operation of the power grid. Therefore, timely and accurate positioning and handling of faults is one of the important measures to ensure the safe and stable operation of the power grid.

[0003] Traveling wave fault ranging technology locates the fault point by measuring the propagation time and speed of the traveling wave signal generated by the fault in the actual power line, thereby predicting potential problems before the fault occurs, reducing power outage time and improving power supply reliability.

[0004] However, the existing traveling wave fault location technology usually only sets fixed detection points at key positions of the power line to locate the fault, resulting in low accuracy of traveling wave fault location.

[0005] It can be seen that how to improve the accuracy of traveling wave fault location measurement has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the invention

[0006] The present invention provides a distributed fault location method and system to solve the problem that the existing traveling wave fault ranging technology usually only sets fixed detection points at key positions of power lines for fault location, resulting in low accuracy of traveling wave fault ranging, and improves the accuracy of traveling wave fault ranging.

[0007] In order to solve the above technical problem, an embodiment of the present invention provides a distributed fault location method.

[0008] Acquire node information data of the target power grid, perform simulation modeling on the node information data, and obtain a power topology model of the target power grid;

[0009] Analyzing virtual power lines between nodes in the power topology model, and determining actual power lines corresponding to the target power grid based on the analysis results;

[0010] Wherein, the virtual power line reflects the connection relationship between any two of the nodes;

[0011] Fault detection is performed on each of the actual power lines according to the traveling wave fault ranging technology to obtain the inspection fault location point of the target power grid.

[0012] As one preferred solution, analyzing the virtual power lines between the nodes in the power topology model and determining the actual power lines corresponding to the target power grid based on the analysis results includes:

[0013] A cluster analysis is performed on the power data of all the virtual power lines, and each actual power line is obtained according to the result of the cluster analysis.

[0014] As one of the preferred solutions, the method of performing fault detection on each of the actual power lines according to the traveling wave fault ranging technology to obtain the inspection fault location point of the target power grid includes:

[0015] Intercepting the actual power line to obtain a corresponding inspection line;

[0016] When the inspection robot's moving distance on the inspection route reaches a preset standard spacing, the inspection robot is used to collect mobile traveling wave data in sequence, and fault location is performed based on the difference in time for all the mobile traveling wave data to reach the inspection robot to obtain an inspection fault location point.

[0017] As one of the preferred solutions, the simulation modeling of the node information data to obtain the power topology model of the target power grid includes:

[0018] Establishing a model of each node according to the node information data in the simulation modeling software; connecting all nodes in pairs to obtain each virtual power path;

[0019] According to each of the virtual power paths, a corresponding virtual power line is established in the simulation modeling software to obtain a power topology model of the target power grid.

[0020] Another embodiment of the present invention provides a distributed fault location system, including:

[0021] A power topology building module is used to obtain node information data of a target power grid, perform simulation modeling on the node information data, and obtain a power topology model of the target power grid;

[0022] A virtual-to-real line mapping module, used to analyze virtual power lines between nodes in the power topology model, and determine actual power lines corresponding to the target power grid based on the analysis results;

[0023] Wherein, the virtual power line reflects the connection relationship between any two of the nodes;

[0024] The fault location module is used to perform fault detection on each of the actual power lines according to the traveling wave fault ranging technology to obtain the inspection fault location point of the target power grid.

[0025] As one preferred solution, analyzing the virtual power lines between the nodes in the power topology model and determining the actual power lines corresponding to the target power grid based on the analysis results includes:

[0026] A cluster analysis is performed on the power data of all the virtual power lines, and each actual power line is obtained according to the result of the cluster analysis.

[0027] As one of the preferred solutions, the method of performing fault detection on each of the actual power lines according to the traveling wave fault ranging technology to obtain the inspection fault location point of the target power grid includes:

[0028] Intercepting the actual power line to obtain a corresponding inspection line;

[0029] When the inspection robot's moving distance on the inspection route reaches a preset standard spacing, the inspection robot is used to collect mobile traveling wave data in sequence, and fault location is performed based on the difference in time for all the mobile traveling wave data to reach the inspection robot to obtain an inspection fault location point.

[0030] As one of the preferred solutions, the actual power line is intercepted to obtain the corresponding inspection line, including:

[0031] Dividing the actual power line into three equal parts to obtain various intercepted lines;

[0032] The intercepted line in the middle is used as the corresponding inspection line.

[0033] As one of the preferred solutions, the simulation modeling of the node information data to obtain the power topology model of the target power grid includes:

[0034] Establishing a model of each node according to the node information data in the simulation modeling software; connecting all nodes in pairs to obtain each virtual power path;

[0035] According to each of the virtual power paths, a corresponding virtual power line is established in the simulation modeling software to obtain a power topology model of the target power grid.

[0036] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0037] (1) First, the node information data of the target power grid is obtained, and simulation modeling is performed on the node information data to obtain the power topology model of the target power grid. The simulation model can simulate the power grid status under different operation scenarios and provide rich decision support information for subsequent fault location;

[0038] (2) Analyzing the virtual power lines between the nodes in the power topology model, obtaining the actual power lines according to the results of the power data clustering analysis of all the virtual power lines, and improving the accuracy of subsequent fault location by mapping the virtual power lines to the actual power lines;

[0039] (3) Fault detection is performed on each actual power line based on the traveling wave fault ranging technology to obtain the inspection fault location point of the target power grid. The traveling wave fault detection of the power grid is realized by moving the inspection robot in the actual power line, thus avoiding the problem of low fault detection accuracy over long distances and improving the accuracy of fault location. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a flow chart of a distributed fault location method in one embodiment of the present invention;

[0041] Figure 2 It is a structural block diagram of a distributed fault location system in one embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] In the description of this application, the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0044] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be a connection between the two elements. The terms "vertical", "horizontal", "left", "right", "upper", "lower" and similar expressions used herein are only for illustrative purposes, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0046] An embodiment of the present invention provides a distributed fault location method. For details, see Figure 1 , Figure 1 The figure shows a flow chart of a distributed fault location method in one embodiment of the present invention.

[0047] Step S1: Acquire node information data of a target power grid, perform simulation modeling on the node information data, and obtain a power topology model of the target power grid.

[0048] Specifically, a model of each node is established in the simulation modeling software according to the node information data; all nodes are connected in pairs to obtain each virtual power path.

[0049] Furthermore, corresponding virtual power lines are established in the simulation modeling software according to each virtual power path to obtain a power topology model of the target power grid.

[0050] It should be noted that the nodes include several trunk nodes and several branch nodes.

[0051] Step S2: Analyze the virtual power lines between the nodes in the power topology model, and determine the actual power lines corresponding to the target power grid based on the analysis results.

[0052] It should be noted that the virtual power line reflects the connection relationship between any two nodes, but does not mean that there is a real power line between the two nodes. Therefore, the authenticity of the virtual power line between the two nodes needs to be verified.

[0053] Specifically, cluster analysis is performed on the power data of all virtual power lines, and each actual power line is obtained according to the result of the cluster analysis.

[0054] It should be noted that cluster analysis is a well-known technology and will not be elaborated in detail in this application.

[0055] Step S3: Perform fault detection on each actual power line according to the traveling wave fault location technology to obtain the inspection fault location point of the target power grid.

[0056] It should be noted that when a line fails, the fault point will generate traveling waves that propagate to both ends of the line. By performing fault detection on each actual power line through traveling wave fault ranging technology, the position of the fault point in the actual power line can be located.

[0057] Specifically, the actual power line is intercepted to obtain the corresponding inspection line.

[0058] As an embodiment of the present application, the actual power line is divided into three equal parts to obtain various intercepted lines, and the middle intercepted line is used as the corresponding inspection line.

[0059] Furthermore, when the inspection robot's moving distance on the inspection route reaches a preset standard spacing, the inspection robot is used to collect mobile traveling wave data in sequence, and the fault location is performed based on the difference in the time it takes for all mobile traveling wave data to reach the inspection robot to obtain the inspection fault location point.

[0060] Another embodiment of the present invention provides a distributed fault location system. For details, see Figure 2 , Figure 2 Shown is a structural block diagram of a distributed fault location system in one embodiment of the present invention.

[0061] The power topology building module 11 is used to obtain the node information data of the target power grid, simulate and model the node information data, and obtain the power topology model of the target power grid;

[0062] Virtual-real line mapping module 12: used to analyze virtual power lines between nodes in the power topology model, and determine the actual power lines corresponding to the target power grid based on the analysis results; wherein the virtual power lines reflect the connection relationship between any two nodes;

[0063] Fault location module 13: used to perform fault detection on each actual power line according to the traveling wave fault distance measurement technology to obtain the inspection fault location point of the target power grid.

[0064] Furthermore, in the above embodiment, the simulation modeling of the node information data to obtain the power topology model of the target power grid includes:

[0065] In the simulation modeling software, the model of each node is established according to the node information data; all nodes are connected in pairs to obtain each virtual power path. According to each virtual power path, the corresponding virtual power line is established in the simulation modeling software to obtain the power topology model of the target power grid.

[0066] Furthermore, in the above embodiment, analyzing the virtual power lines between the nodes in the power topology model and determining the actual power lines corresponding to the target power grid based on the analysis results includes:

[0067] A cluster analysis is performed on the power data of all virtual power lines, and each actual power line is obtained according to the result of the cluster analysis.

[0068] Furthermore, in the above embodiment, the fault detection is performed on each actual power line according to the traveling wave fault location technology to obtain the inspection fault location point of the target power grid, including:

[0069] The actual power line is divided into three equal parts to obtain various intercepted lines, and the middle intercepted line is used as the corresponding inspection line.

[0070] When the inspection robot's moving distance on the inspection route reaches the preset standard spacing, the inspection robot is used to collect mobile traveling wave data in sequence, and the fault location is performed based on the difference in the time it takes for all mobile traveling wave data to reach the inspection robot to obtain the inspection fault location point.

[0071] As an embodiment of the present application, the system also includes a voltage detection module, a current detection module, a high-precision GPS / Beidou synchronized clock module, a data processing module and a communication module. The voltage detection module, the current detection module and the high-precision GPS / Beidou synchronized clock module are all connected to the data processing module, and the data processing module is connected to the communication module.

[0072] It should be noted that the voltage detection module is used to detect the voltage traveling wave signal in the distribution network, and the current detection module is used to detect the current traveling wave signal in the distribution network. The high-precision GPS / Beidou synchronous clock module is used to ensure the time synchronization between the monitoring units, the data processing module is responsible for capturing, processing and storing the monitored traveling wave data, and the communication module is used to transmit the traveling wave data in real time.

[0073] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A distributed fault location method, characterized in that: The method comprises: Acquire node information data of the target power grid, perform simulation modeling on the node information data, and obtain a power topology model of the target power grid; Analyzing virtual power lines between nodes in the power topology model, and determining actual power lines corresponding to the target power grid based on the analysis results; Wherein, the virtual power line reflects the connection relationship between any two of the nodes; Fault detection is performed on each of the actual power lines according to the traveling wave fault ranging technology to obtain the inspection fault location point of the target power grid.

2. A distributed fault location method according to claim 1, characterized in that: The analyzing the virtual power lines between the nodes in the power topology model and determining the actual power lines corresponding to the target power grid based on the analysis results includes: A cluster analysis is performed on the power data of all the virtual power lines, and each actual power line is obtained according to the result of the cluster analysis.

3. A distributed fault location method according to claim 1, characterized in that: The method of performing fault detection on each of the actual power lines according to the traveling wave fault ranging technology to obtain the inspection fault location point of the target power grid includes: Intercepting the actual power line to obtain a corresponding inspection line; When the inspection robot's moving distance on the inspection route reaches a preset standard spacing, the inspection robot is used to collect mobile traveling wave data in sequence, and fault location is performed based on the difference in time for all the mobile traveling wave data to reach the inspection robot to obtain an inspection fault location point.

4. A distributed fault location method according to claim 3, characterized in that: The actual power line is intercepted to obtain a corresponding inspection line, including: Dividing the actual power line into three equal parts to obtain various intercepted lines; The intercepted line in the middle is used as the corresponding inspection line.

5. A distributed fault location method according to claim 1, characterized in that: The performing simulation modeling on the node information data to obtain the power topology model of the target power grid includes: Establishing a model of each node according to the node information data in the simulation modeling software; connecting all nodes in pairs to obtain each virtual power path; According to each of the virtual power paths, a corresponding virtual power line is established in the simulation modeling software to obtain a power topology model of the target power grid.

6. A distributed fault location system, characterized in that: The system comprises: A power topology building module is used to obtain node information data of a target power grid, perform simulation modeling on the node information data, and obtain a power topology model of the target power grid; A virtual-to-real line mapping module, used to analyze virtual power lines between nodes in the power topology model, and determine actual power lines corresponding to the target power grid based on the analysis results; Wherein, the virtual power line reflects the connection relationship between any two of the nodes; The fault location module is used to perform fault detection on each of the actual power lines according to the traveling wave fault ranging technology to obtain the inspection fault location point of the target power grid.

7. A distributed fault location system according to claim 6, characterized in that: The analyzing the virtual power lines between the nodes in the power topology model and determining the actual power lines corresponding to the target power grid based on the analysis results includes: A cluster analysis is performed on the power data of all the virtual power lines, and each actual power line is obtained according to the result of the cluster analysis.

8. A distributed fault location system according to claim 6, characterized in that: The method of performing fault detection on each of the actual power lines according to the traveling wave fault ranging technology to obtain the inspection fault location point of the target power grid includes: Intercepting the actual power line to obtain a corresponding inspection line; When the inspection robot's moving distance on the inspection route reaches a preset standard spacing, the inspection robot is used to collect mobile traveling wave data in sequence, and fault location is performed based on the difference in time for all the mobile traveling wave data to reach the inspection robot to obtain an inspection fault location point.

9. A distributed fault location system according to claim 8, characterized in that: The actual power line is intercepted to obtain a corresponding inspection line, including: Dividing the actual power line into three equal parts to obtain various intercepted lines; The intercepted line in the middle is used as the corresponding inspection line.

10. A distributed fault location system according to claim 6, characterized in that: The performing simulation modeling on the node information data to obtain the power topology model of the target power grid includes: Establishing a model of each node according to the node information data in the simulation modeling software; connecting all nodes in pairs to obtain each virtual power path; According to each of the virtual power paths, a corresponding virtual power line is established in the simulation modeling software to obtain a power topology model of the target power grid.

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