Active power distribution network grounding fault positioning method

Abstract

The invention provides an active power distribution network grounding fault positioning method. Each grounding target in an active power distribution network and parameter information of the grounding target are acquired; according to the grounding fault influence information of each grounding target, configuring an influence label for each grounding target; after a grounding fault occurs, similar grounding fault influence information is retrieved through the influence label according to fault result information; taking the obtained corresponding grounding target as a suspected target according to the retrieved grounding fault influence information; and checking the suspected target and obtaining the final position of the grounding target with the grounding fault. According to the method, each grounding target in the power distribution network is counted and analyzed, the basic information of each grounding target and the grounding fault influence information of each grounding target are associated and configured into the influence label convenient to retrieve, and retrieval is performed according to the fault result after the grounding fault occurs; therefore, the range of grounding targets where grounding faults possibly occur can be rapidly narrowed, and the fault position can be determined after the screened targets are checked.

Description

Technical Field

[0001] The present invention relates to the field of distribution networks, and more particularly, to a method for locating grounding faults in active distribution networks. Background Art

[0002] An active distribution network refers to a distribution network with a large number of distributed power sources connected and bidirectional power flow, also known as an active distribution network. An active distribution network is a network for energy exchange and distribution, with bidirectional power flow in its power flow and fault current. The power flow and fault analysis of traditional distribution networks are no longer applicable and need to be adjusted and improved accordingly.

[0003] Grounding faults in distribution networks are important issues affecting power supply quality and safety. A grounding fault in a distribution network refers to a fault caused by abnormal grounding resistance or damaged grounding lines in the distribution system, resulting in the inability of equipment to be properly grounded. Once a grounding fault occurs, it will not only affect the safe operation of equipment, but may also cause electric shock to personnel and even lead to serious consequences such as fires. The common causes of grounding faults mainly include disconnected grounding lines, excessive grounding resistance, poor contact of grounding wires, damaged grounding wires, improper selection of grounding methods, etc. In daily operation, equipment aging, harsh environment, human negligence, etc. may all lead to the occurrence of grounding faults. Currently, digital twin systems are often used to locate faults. After a fault occurs, correlation operation analysis is performed through time-series data. Due to the large amount of operation data, the efficiency is low. Summary of the Invention

[0004] To solve the problems in the background art, the present invention proposes a method for locating grounding faults in active distribution networks.

[0005] A method for locating grounding faults in active distribution networks includes the steps of:

[0006] S100. Obtain each grounding target and its parameter information in the active distribution network;

[0007] S200. Configure an impact label for each grounding target according to the grounding fault impact information of each grounding target;

[0008] S300. After a grounding fault occurs, retrieve similar grounding fault impact information through the impact label according to the fault result information;

[0009] S400. Use the corresponding grounding target obtained according to the retrieved grounding fault impact information as a suspected target;

[0010] S500. Conduct a check on the suspected target and obtain the location of the grounding target where the grounding fault finally occurs.

[0011] Based on the above, in step S400, a retrieval database is constructed to store the grounding targets and their associated parameter information, grounding fault impact information, and impact label information; the retrieval database is constructed with a unified naming rule for storage and a retrieval rule.

[0012] Based on the above, the parameter information at least includes the name information, type information, location information, electrical parameter information, and unique ID information of the grounding target.

[0013] Based on the above, the grounding fault impact information at least includes the impact area range information, affected equipment range information, affected equipment operation information, and affected electrical parameter information corresponding to each grounding fault type after the grounding fault occurs on the grounding target.

[0014] Based on the above, the impact label is configured as three-level label information corresponding to the grounding fault impact information. The first-level label information is configured to associate the impact area range and its corresponding fault phenomenon keywords, the second-level label information is configured to associate the affected equipment range and its corresponding fault phenomenon keywords, and the third-level label information is configured to associate the affected equipment operation and its corresponding fault phenomenon keywords.

[0015] Based on the above, the retrieval database constructs multiple-level retrieval windows, and each level of retrieval window respectively includes an impact range retrieval unit and a fault phenomenon retrieval unit.

[0016] Based on the above, an update and editing window for the retrieval database is constructed, and the updated information of the grounding target during the daily inspection and maintenance of the active distribution network is updated and stored in the database through the update and editing window.

[0017] The present invention has prominent substantive features and significant progress compared with the prior art. Specifically, the present invention statistically analyzes each grounding target in the active distribution network, statistically summarizes the impact range and impact objects of the grounding fault of each grounding target, and then associates the basic information of each grounding target and its grounding fault impact information and configures it as an impact label convenient for retrieval. After a grounding fault occurs, the retrieval is performed according to the fault result, and the range of grounding targets where the grounding fault may occur can be quickly narrowed down. Then, the screened targets can be checked to determine the fault location, which has the advantages of simple use, fast and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a flowchart of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0020] As Figure 1 shown, a method for locating grounding faults in an active distribution network includes the steps of: S100, obtaining each grounding target and its parameter information in the active distribution network; S200, configuring an influence label for each grounding target according to the grounding fault influence information of each grounding target; S300, after a grounding fault occurs, retrieving similar grounding fault influence information through the influence label according to the fault result information; S400, taking the corresponding grounding target obtained according to the retrieved grounding fault influence information as a suspected target; S500, checking the suspected target and obtaining the location of the grounding target where the grounding fault finally occurs.

[0021] Specifically, in reality, the active distribution network needs to be regularly inspected and maintained. After checking the active distribution network, the grounding targets and their parameter information in the active distribution network are counted. The grounding targets refer to objects that may have grounding faults, such as grounding resistors, grounding wires, etc. The parameter information at least includes the name information, type or model information, location information, electrical parameter information, and unique ID information of the grounding target. Since each grounding target will have a certain impact after a grounding fault occurs, such as the phase voltage of the associated equipment decreasing, the neutral point voltage shifting, etc., and even causing abnormalities in the overall electrical parameters within a certain range, such as in a certain community or a certain factory building. However, when different grounding targets have faults, the affected equipment, regional scope, etc. will be different. Therefore, each counted grounding target is pre-analyzed. According to each type of grounding fault that each grounding target may occur, the corresponding regional scope, equipment scope, equipment operation conditions, and corresponding electrical parameter information affected during the grounding fault are counted. Then, each grounding target, its parameter information, and grounding fault influence information are associated, and corresponding influence label information is configured according to a unified standard induction standard. After a grounding fault actually occurs in reality, according to the fault results generated by the actual grounding fault, such as the influence range, affected equipment, etc., retrieval is performed through the influence label information. The retrieved grounding target is the suspected target that may have a grounding fault. According to the parameter information associated with the grounding target, such as name, location, unique ID, etc., the specific location of the suspected target can be known. At this time, the target range of the check is greatly reduced. After actual checking, the grounding target where the grounding fault occurs can be screened out, that is, the actual location of the grounding fault can be located.

[0022] Preferably, in this embodiment, a retrieval database is also constructed. The retrieval database is used to store grounding targets and their associated parameter information, grounding fault impact information, and impact label information. When constructing the retrieval database, a unified naming rule for storage and a retrieval rule are configured to facilitate unified management and accurate retrieval. In reality, there are also many types of grounding faults, such as single-phase grounding faults (including metallic grounding and high-resistance grounding), two-phase grounding faults, three-phase grounding faults, intermittent arc grounding faults, complex grounding faults caused by parallel connection of multiple power sources, inverter-related grounding faults, etc. Therefore, the grounding fault impact information at least includes the information on the affected area range, affected equipment range, affected equipment operation, and affected electrical parameter information corresponding to each grounding fault type after the grounding target has a grounding fault. Since the content of this grounding fault impact information is relatively large, it is necessary to summarize or name it according to a unified standard, so as to facilitate the configuration of concise and accurate impact labels. In this embodiment, for example, the impact label is configured as three-level label information corresponding to the grounding fault impact information, respectively corresponding to different impact ranges of the grounding fault. The first-level label information is configured as the associated affected area range and its corresponding fault phenomenon keywords, the second-level label information is configured as the associated affected equipment range and its corresponding fault phenomenon keywords, and the third-level label information is configured as the associated affected equipment operation and its corresponding fault phenomenon keywords.

[0023] The retrieval database is constructed with multiple levels of retrieval windows. In this embodiment, there are three levels of retrieval windows, respectively corresponding to the classification of the impact labels. Each level of retrieval window includes an impact range retrieval unit and a fault phenomenon retrieval unit. The impact range retrieval unit is used to retrieve the range keywords in the impact label, and the fault phenomenon retrieval unit is used to retrieve the fault phenomenon keywords in the impact label. When retrieving, it is not necessary to retrieve all three levels of label information at the same time. Instead, retrieval is performed according to the information of the actual fault obtained most directly. For example, if only the impact information of some devices caused by the grounding fault is obtained currently, then only the second-level label information needs to be retrieved at this time, that is, keyword retrieval is performed on the associated affected devices and their corresponding fault phenomena, and some retrieval results can be obtained. If the number of retrieval results at this time is large, other impact information generated by the grounding fault can be further obtained, such as the change information of the operation parameters of the affected devices, etc., so as to further retrieve the operation parameter types of the affected devices and their corresponding fault phenomena, thereby further narrowing the number range of suspected targets. In other embodiments, the number of levels of the label information is set according to the actual situation. The basic principle of setting is that when performing full-level retrieval, the number of suspected targets retrieved should be within a range convenient for quick troubleshooting, such as several or more than a dozen, etc.

[0024] In reality, the retrieval database also has an update and editing window. Due to the maintenance, repair, and replacement of accessories of active distribution network equipment, the grounding targets will also be repaired and replaced, and the corresponding affected equipment will also change. Therefore, in reality, the updated information about the grounding targets and others during the daily inspection and maintenance of the active distribution network is updated and re-entered into the database through the update and editing window.

[0025] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

[0026] The basic principles of the present invention have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, advantages, effects, etc. mentioned in the present invention are only examples and not limitations. It cannot be considered that these advantages, advantages, effects, etc. are essential for each embodiment of the present invention. In addition, the above-disclosed specific details are only for the purposes of illustration and facilitating understanding, rather than limitations. The above details do not limit the present invention to necessarily adopt the above specific details to implement.

[0027] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present invention are only exemplary examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with each other. The word "or" and "and" used here refer to the word "and / or", and can be used interchangeably with each other, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with each other.

[0028] In addition, as used herein, the "or" used in the enumeration of items starting with "at least one" indicates a separate enumeration. For example, the enumeration of "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (that is, A and B and C). In addition, the term "exemplary" does not mean that the described examples are preferred or better than other examples.

[0029] It should also be noted that in the systems and methods of the present invention, the various components or steps can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present invention and can be carried out without departing from the technology defined by the appended claims, as well as various changes, substitutions and modifications to the technology described herein. In addition, the scope of the claims of the present invention is not limited to the specific aspects of the devices, machines, manufactures, compositions of events, means, methods and acts described above. Devices, machines, manufactures, compositions of events, means, methods or acts that currently exist or will be developed later that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Thus, the appended claims include such devices, machines, manufactures, compositions of events, means, methods or acts within their scope.

[0030] The foregoing description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present invention. Thus, the present invention is not intended to be limited to the aspects shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0031] The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present invention to the form disclosed herein. Although several example aspects and embodiments have been discussed above, those skilled in the art will recognize some of their variations, modifications, alterations, additions and subcombinations.

Claims

1. An active distribution network grounding fault location method, characterized in that: Including the steps: S100. Obtain each grounding target and its parameter information in the active distribution network; S200. Configure an impact label for each grounding target according to the grounding fault impact information of each grounding target; S300. After a grounding fault occurs, retrieve similar grounding fault impact information through the impact label according to the fault result information; S400. Use the obtained corresponding grounding target as a suspected target according to the retrieved grounding fault impact information; S500. Check the suspected target and obtain the location of the grounding target where the grounding fault finally occurs.

2. The active distribution network grounding fault location method according to claim 1, wherein: In step S400, a retrieval database is constructed for storing grounding targets and their associated parameter information, grounding fault impact information, and impact label information; the retrieval database is constructed with a unified naming rule for storage and a retrieval rule.

3. A method for grounding fault location in an active distribution network according to claim 1, characterized in that: The parameter information at least includes the name information, type information, location information, electrical parameter information, and unique ID information of the grounding target.

4. A method for locating a grounding fault in an active distribution network according to claim 1, characterized in that: The grounding fault impact information at least includes the impact area range information, impact equipment range information, impact equipment operation information, and impact electrical parameter information corresponding to each grounding fault type after the grounding target has a grounding fault.

5. A method for grounding fault location in an active distribution network according to claim 1, characterized in that: The impact label is configured as three-level label information corresponding to the grounding fault impact information. The first-level label information is configured as the associated impact area range and its corresponding fault phenomenon keywords. The second-level label information is configured as the associated impact equipment range and its corresponding fault phenomenon keywords. The third-level label information is configured as the associated impact equipment operation and its corresponding fault phenomenon keywords.

6. The active distribution network grounding fault location method according to claim 2, wherein: The retrieval database constructs multi-level retrieval windows, and each level of retrieval window respectively includes an impact range retrieval unit and a fault phenomenon retrieval unit.

7. A method for locating grounding faults in an active distribution network according to claim 2, characterized in that: Construct an update and edit window for the retrieval database, and update and store the updated information of the grounding target during the daily inspection and maintenance of the active distribution network through the update and edit window.

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