A method for locating single-phase tripping fault in power distribution network

Abstract

The present invention relates to a method for locating a single-phase tripping fault in a power distribution network, comprising: connecting a tripping detection mechanism to a power distribution network, for issuing a first detection instruction when a single-phase tripping of the power distribution network is detected, otherwise, issuing a second detection instruction; using a numerical judgment device to issue a contact judgment signal when the first percentage and the second percentage are both less than or equal to a set percentage limit and the depth of field data of the line conductor and lightning in the sequential conversion screen match, otherwise, issuing a non-contact judgment signal. The present invention can determine whether a lightning strike on the line conductor occurs in the on-site screen at a past moment based on the targeted analysis of various on-site visual data of the line conductor and lightning at the distribution network after a single-phase tripping of the power distribution network occurs, thereby completing intelligent fault location based on historical screen information analysis after the single-phase tripping of the power distribution network.

Description

Technical Field

[0001] The present invention relates to the field of power distribution network management, and in particular to a method for locating a single-phase tripping fault in a power distribution network. Background Art

[0002] The voltage generated by direct lightning is called direct lightning overvoltage, also known as conduction overvoltage. When the distribution network is directly struck by lightning, a high-voltage shock wave is formed. When the leading channel of the lightning discharge does not hit the ground, but hits the wires, towers or other buildings of the distribution network, a large amount of lightning current passes through the struck object, generating a voltage drop on the impedance grounding resistance of the struck object, causing a very high potential to appear at the struck point. This is the direct lightning overvoltage.

[0003] However, there are other possible reasons for direct lightning overvoltage, not only lightning strikes on line conductors. Apparently, there is currently a lack of technical solutions to explore the causes of direct lightning overvoltage after it is generated, in order to determine whether it is attributed to lightning strikes on line conductors. As a result, the fault cause of single-phase tripping of the distribution network caused by direct lightning overvoltage cannot be located as direct lightning overvoltage generated by lightning strikes on line conductors.

[0004] CN113253054A discloses a method for quickly locating lightning faults in a distribution network based on a lightning imager, comprising the following steps: S1, when a lightning fault occurs in the distribution network, obtaining the tripping information of the circuit breaker at the head end of the distribution network line; S2, obtaining the lightning data corresponding to the tripping time; when downloading the lightning data, selecting the positioning accuracy d of the lightning data, wherein the positioning accuracy d is the resolution of the lightning imager; S3, parsing and calculating the lightning data to determine the occurrence time and longitude and latitude coordinates of the lightning event in the distribution network area; S4, determining the selection range of the pole tower coordinates in the tripping line according to the longitude and latitude coordinates of the lightning event; S5, obtaining the coordinates of each pole tower in the tripping line of the distribution network from the database of the power supply department, and determining the pole tower coordinates within the selection range of the pole tower coordinates; step S6, calculating the distance between each pole tower coordinate within the selection range of the pole tower coordinates and the longitude and latitude coordinates of the lightning event in the distribution network area.

[0005] CN111934316A discloses a method for selecting a substation recovery path after a power grid trips. First, it is determined whether there is a recovery path with the same voltage level in the same power supply area, and the remaining available load capacity of the recovery path with the same voltage level in the power supply area is compared with the load of the substation to be restored, and the recovery path that does not meet the load demand is screened out. Then, the recovery path that meets the load demand is defined as an optional recovery path, and the optional recovery paths are sorted according to the size of the remaining available load capacity, and the recovery path with a large remaining available load capacity is given priority.

[0006] CN111768077A discloses a method for intelligent identification of power grid tripping events based on knowledge graph. Based on the knowledge graph technology and natural language processing technology in the field of artificial intelligence, combined with the knowledge characteristics of the power system, the monitoring business workflow and the judgment logic of power grid tripping events are deeply studied. Based on the learning of historical sample data of power grid tripping events, after knowledge extraction and fusion, a knowledge triple model of power grid tripping events is constructed to form the association relationship between entities, disambiguate the information with uncertainty, reduce the understanding differences caused by improper maintenance of personnel or professional barriers, realize the intelligent identification of power grid tripping events, and perform knowledge reasoning based on the knowledge graph, combine with relevant power grid status perception to complete cross-confirmation and more information collection, effectively reduce the business pressure of power grid monitoring personnel while improving the efficiency of power grid tripping event response. Summary of the invention

[0007] In order to solve the technical problems in the related fields, the present invention provides a method for locating a single-phase tripping fault in a distribution network, by judging the percentage of consistency between the edge shape of a first reference picture corresponding to a line conductor and the edge shape of a standard pattern corresponding to the line conductor as the first percentage, and judging the percentage of consistency between the edge shape of a second reference picture corresponding to lightning and the edge shape of a standard pattern corresponding to the line conductor as the second percentage, when the first percentage and the second percentage are both less than or equal to the set percentage limit and the depth of field data of the line conductor and the lightning match in the sequential conversion picture, a contact judgment signal is issued, otherwise, a non-contact judgment signal is issued, and at the same time as the contact judgment signal is issued, the fault cause of the single-phase tripping of the distribution network is located as a direct lightning overvoltage generated by lightning on the line conductor, and the corresponding fault location information is wirelessly reported to a remote power management server, and at the same time as the contact non-judgment signal is issued, the fault cause of the single-phase tripping of the distribution network is located as other causes of direct lightning overvoltage not generated by lightning on the line conductor, thereby completing intelligent fault location based on historical picture information analysis after the single-phase tripping of the distribution network.

[0008] According to the present invention, there is provided a method for locating a single-phase tripping fault in a power distribution network, the method comprising:

[0009] Connecting the trip detection mechanism to the power distribution network, for issuing a first detection instruction when a single-phase trip of the power distribution network is detected, and for issuing a second detection instruction when a single-phase trip of the power distribution network is not detected;

[0010] Connecting a picture calling mechanism to the tripping detection mechanism, so as to call, upon receiving the first detection instruction, an imaging picture of the environment where the power distribution network is located corresponding to a historical moment before the moment when the first detection instruction is issued;

[0011] The order conversion mechanism is connected to the picture calling mechanism and includes a filter sharpening device, an exponential enhancement device and a clarity processing device, which is used to continuously perform high-pass filter sharpening processing, image content enhancement processing based on exponential transformation and geometric mean filter processing on the received imaging picture to obtain and output the corresponding order conversion picture;

[0012] Connecting a feature application device to the sequence conversion mechanism to identify the portion of the line conductor in the sequence conversion picture as a first reference picture based on the color imaging feature of the line conductor, and identifying the portion of the lightning in the sequence conversion picture as a second reference picture based on the grayscale imaging feature of the lightning;

[0013] Connecting the shape analysis device to the feature application device to determine the consistency percentage between the edge shape of the first reference picture corresponding to the line conductor and the edge shape of the standard pattern corresponding to the line conductor as a first percentage, and determining the consistency percentage between the edge shape of the second reference picture corresponding to the lightning and the edge shape of the standard pattern corresponding to the line conductor as a second percentage;

[0014] Connecting the value judgment device to the shape analysis device, and used to send a contact judgment signal when the first percentage and the second percentage are both less than or equal to the set percentage limit and the depth data of the line conductor and the lightning in the sequential conversion screen match, otherwise, send a non-contact judgment signal;

[0015] The numerical judgment device is also used to locate the fault cause of the single-phase tripping of the distribution network as a direct lightning overvoltage generated by lightning on the line conductor while sending the contact judgment signal, and wirelessly report the corresponding fault location information to the remote power management server;

[0016] The numerical determination device is also used to locate the fault cause of the single-phase tripping of the power distribution network as other causes other than the direct lightning overvoltage generated by lightning strikes on the line conductors while sending out the contact non-determination signal;

[0017] Among them, determining the consistency percentage between the edge shape of the first reference image corresponding to the line conductor and the edge shape of the standard pattern corresponding to the line conductor as the first percentage includes: the percentage of the length of the parts with the same two edge shapes in the total length of the curve corresponding to the edge shape of the standard pattern corresponding to the line conductor is the first percentage.

[0018] It can be seen that the present invention has at least the following four important invention points:

[0019] First: determining the consistency percentage between the edge shape of the first reference picture corresponding to the line conductor and the edge shape of the standard pattern corresponding to the line conductor as the first percentage, and determining the consistency percentage between the edge shape of the second reference picture corresponding to the lightning and the edge shape of the standard pattern corresponding to the line conductor as the second percentage;

[0020] Second: when the first percentage and the second percentage are both less than or equal to the set percentage limit and the depth data of the line conductor and the lightning in the sequential conversion screen match, a contact judgment signal is issued, otherwise, a non-contact judgment signal is issued;

[0021] Third: Specifically, determining the consistency percentage of the edge shape of the first reference picture corresponding to the line conductor and the edge shape of the standard pattern corresponding to the line conductor as the first percentage includes: the percentage of the length of the portion with the same edge shape occupied by the total length of the curve corresponding to the edge shape of the standard pattern corresponding to the line conductor is the first percentage;

[0022] Fourth: while sending out a contact judgment signal, the fault cause of the single-phase tripping of the distribution network is located as a direct lightning overvoltage generated by a lightning strike on the line conductor, and the corresponding fault location information is wirelessly reported to a remote power management server, and while sending out a contact non-judgment signal, the fault cause of the single-phase tripping of the distribution network is located as other causes other than a direct lightning overvoltage generated by a lightning strike on the line conductor, thereby completing the intelligent fault location based on the analysis of historical screen information after the single-phase tripping of the distribution network. DETAILED DESCRIPTION

[0023] The implementation scheme of the method for locating a single-phase tripping fault in a power distribution network of the present invention will be described in detail below.

[0024] Implementation A

[0025] The method for locating a single-phase tripping fault in a power distribution network according to embodiment A of the present invention includes:

[0026] Connecting the trip detection mechanism to the power distribution network, for issuing a first detection instruction when a single-phase trip of the power distribution network is detected, and for issuing a second detection instruction when a single-phase trip of the power distribution network is not detected;

[0027] Specifically, the trip detection mechanism is connected to the power distribution network, and is used to issue a first detection instruction when a single-phase trip of the power distribution network is detected, and is also used to issue a second detection instruction when the single-phase trip of the power distribution network is not detected, including: a programmable logic device can be selected to implement the trip detection mechanism being connected to the power distribution network, and is used to issue a first detection instruction when a single-phase trip of the power distribution network is detected, and is also used to issue a second detection instruction when the single-phase trip of the power distribution network is not detected;

[0028] Connecting a picture calling mechanism to the tripping detection mechanism, so as to call, upon receiving the first detection instruction, an imaging picture of the environment where the power distribution network is located corresponding to a historical moment before the moment when the first detection instruction is issued;

[0029] The order conversion mechanism is connected to the picture calling mechanism and includes a filter sharpening device, an exponential enhancement device and a clarity processing device, which is used to continuously perform high-pass filter sharpening processing, image content enhancement processing based on exponential transformation and geometric mean filter processing on the received imaging picture to obtain and output the corresponding order conversion picture;

[0030] Connecting a feature application device to the sequence conversion mechanism to identify the portion of the line conductor in the sequence conversion picture as a first reference picture based on the color imaging feature of the line conductor, and identifying the portion of the lightning in the sequence conversion picture as a second reference picture based on the grayscale imaging feature of the lightning;

[0031] Connecting the shape analysis device to the feature application device to determine the consistency percentage between the edge shape of the first reference picture corresponding to the line conductor and the edge shape of the standard pattern corresponding to the line conductor as a first percentage, and determining the consistency percentage between the edge shape of the second reference picture corresponding to the lightning and the edge shape of the standard pattern corresponding to the line conductor as a second percentage;

[0032] Connecting the value judgment device to the shape analysis device, and used to send a contact judgment signal when the first percentage and the second percentage are both less than or equal to the set percentage limit and the depth data of the line conductor and the lightning in the sequential conversion screen match, otherwise, send a non-contact judgment signal;

[0033] The numerical judgment device is also used to locate the fault cause of the single-phase tripping of the distribution network as a direct lightning overvoltage generated by lightning on the line conductor while sending the contact judgment signal, and wirelessly report the corresponding fault location information to the remote power management server;

[0034] The numerical determination device is also used to locate the fault cause of the single-phase tripping of the power distribution network as other causes other than the direct lightning overvoltage generated by lightning strikes on the line conductors while sending out the contact non-determination signal;

[0035] The determining of the consistency percentage of the edge shape of the first reference image corresponding to the line conductor and the edge shape of the standard pattern corresponding to the line conductor as the first percentage includes: the percentage of the length of the portion with the same edge shape occupied by the total length of the curve corresponding to the edge shape of the standard pattern corresponding to the line conductor is the first percentage;

[0036] The picture calling mechanism is further used to stop calling the imaging picture of the environment where the power distribution network is located corresponding to the historical moment before the moment when the second detection instruction is issued when the second detection instruction is received;

[0037] Among them, the order conversion mechanism is connected to the picture calling mechanism and includes a filter sharpening device, an exponential enhancement device and a clarity processing device, which is used to continuously perform high-pass filter sharpening processing, image content enhancement processing based on exponential transformation and geometric mean filter processing on the received imaging picture to obtain and output the corresponding order conversion picture, including: the filter sharpening device is used to perform high-pass filter sharpening processing on the received picture data.

[0038] Implementation Plan B

[0039] Compared with the embodiment A of the present invention, the method for locating the single-phase tripping fault of the power distribution network shown in the embodiment B of the present invention may also include the following components:

[0040] Connecting the timing server to the feature application device, the filter sharpening device, the index enhancement device and the clarity processing device respectively, so as to provide the feature application device, the filter sharpening device, the index enhancement device and the clarity processing device with the timing services required by each of them;

[0041] The timing server is connected to the feature application device, the filter sharpening device, the index enhancement device and the clarity processing device respectively to provide the feature application device, the filter sharpening device, the index enhancement device and the clarity processing device with the timing services required by each of them, including: the timing server uses the same timing clock to provide the feature application device, the filter sharpening device, the index enhancement device and the clarity processing device with the timing services required by each of them;

[0042] Among them, the timing server device uses the same timing clock to provide the timing services required by the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device respectively, including: the timing server device uses the same timing clock to provide the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device respectively with reference clock signals of various changing waveforms of the same timing clock.

[0043] Implementation Plan C

[0044] Compared with embodiment A of the present invention, the method for locating a single-phase tripping fault in a power distribution network according to embodiment C of the present invention may further include the following components:

[0045] Connecting a parallel data bus to the feature application device, the filter sharpening device, the exponential enhancement device, and the clarity processing device, respectively, to provide a parallel data communication link between any two of the feature application device, the filter sharpening device, the exponential enhancement device, and the clarity processing device;

[0046] Wherein, the parallel data bus is connected to the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device respectively, and is used to provide a parallel data communication link between the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device, including: providing a 64-bit parallel data communication link between the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device;

[0047] Wherein, the parallel data bus is connected to the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device respectively, and is used to provide a parallel data communication link between the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device, including: providing a 32-bit parallel data communication link between the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device;

[0048] Wherein, the parallel data bus is connected to the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device respectively, and is used to provide a parallel data communication link between the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device, including: providing a 16-bit parallel data communication link between the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device;

[0049] Among them, the parallel data bus is connected to the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device respectively to provide a parallel data communication link between the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device. It also includes: the distance between the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device is less than or equal to a set distance threshold.

[0050] In addition, in the method for locating a single-phase tripping fault in a power distribution network, the order conversion mechanism is connected to the picture calling mechanism and includes a filter sharpening device, an exponential enhancement device, and a clarity processing device, which is used to continuously perform high-pass filter sharpening processing, image content enhancement processing based on exponential transformation, and geometric mean filter processing on the received imaging picture to obtain and output the corresponding order conversion picture. The exponential enhancement device is used to perform image content enhancement processing based on exponential transformation on the received picture data;

[0051] And wherein, the order conversion mechanism is connected to the picture calling mechanism and includes a filter sharpening device, an exponential enhancement device and a clarity processing device, which is used to continuously perform high-pass filter sharpening processing, image content enhancement processing based on exponential transformation and geometric mean filtering processing on the received imaging picture to obtain and output the corresponding order conversion picture, and also includes: the clarity processing device is used to perform geometric mean filtering processing on the received picture data.

[0052] The method for locating single-phase tripping faults in a distribution network of the present invention solves the technical problem in the prior art that it is difficult to locate faults after a single-phase tripping of a distribution network occurs. After a single-phase tripping of a distribution network occurs, based on targeted analysis of various on-site visual data of line conductors and lightning at the distribution network, it can be determined whether lightning strikes the line conductors in the on-site images at past moments, thereby completing intelligent fault location based on analysis of historical image information after a single-phase tripping of the distribution network.

[0053] Although the present invention has been described in detail in conjunction with certain preferred embodiments, it is apparent that many alternatives, modifications and variations are apparent to those skilled in the art considering the above description. Therefore, it is contemplated that the appended claims will include any such alternatives, modifications and variations that fall within the true scope and spirit of the present invention.

Claims

1. A method for locating a single-phase tripping fault in a power distribution network, characterized in that: The method comprises: Connecting the trip detection mechanism to the power distribution network, for issuing a first detection instruction when a single-phase trip of the power distribution network is detected, and for issuing a second detection instruction when a single-phase trip of the power distribution network is not detected; Connecting a picture calling mechanism to the tripping detection mechanism, so as to call, upon receiving the first detection instruction, an imaging picture of the environment where the power distribution network is located corresponding to a historical moment before the moment when the first detection instruction is issued; The order conversion mechanism is connected to the picture calling mechanism and includes a filter sharpening device, an exponential enhancement device and a clarity processing device, which is used to continuously perform high-pass filter sharpening processing, image content enhancement processing based on exponential transformation and geometric mean filter processing on the received imaging picture to obtain and output the corresponding order conversion picture; Connecting a feature application device to the sequence conversion mechanism to identify the portion of the line conductor in the sequence conversion picture as a first reference picture based on the color imaging feature of the line conductor, and identifying the portion of the lightning in the sequence conversion picture as a second reference picture based on the grayscale imaging feature of the lightning; Connecting the shape analysis device to the feature application device to determine the consistency percentage between the edge shape of the first reference picture corresponding to the line conductor and the edge shape of the standard pattern corresponding to the line conductor as a first percentage, and determining the consistency percentage between the edge shape of the second reference picture corresponding to the lightning and the edge shape of the standard pattern corresponding to the line conductor as a second percentage; Connecting the value judgment device to the shape analysis device, and configured to send a contact judgment signal when the first percentage and the second percentage are both less than or equal to the set percentage limit and the depth data of the line conductor and the lightning in the sequential conversion screen match, otherwise, send a non-contact judgment signal; The numerical judgment device is also used to locate the fault cause of the single-phase tripping of the distribution network as a direct lightning overvoltage generated by lightning on the line conductor while sending the contact judgment signal, and wirelessly report the corresponding fault location information to the remote power management server; The numerical determination device is also used to locate the fault cause of the single-phase tripping of the power distribution network as other causes other than the direct lightning overvoltage generated by lightning strikes on the line conductors while sending out the contact non-determination signal; Among them, determining the consistency percentage between the edge shape of the first reference image corresponding to the line conductor and the edge shape of the standard pattern corresponding to the line conductor as the first percentage includes: the percentage of the length of the parts with the same two edge shapes in the total length of the curve corresponding to the edge shape of the standard pattern corresponding to the line conductor is the first percentage.

2. The method for locating a single-phase tripping fault in a power distribution network according to claim 1, characterized in that: The picture calling mechanism is also used to stop calling the imaging picture of the environment where the power distribution network is located corresponding to the historical moment before the moment when the second detection instruction is issued when the second detection instruction is received; Among them, the order conversion mechanism is connected to the picture calling mechanism and includes a filter sharpening device, an exponential enhancement device and a clarity processing device, which is used to continuously perform high-pass filter sharpening processing, image content enhancement processing based on exponential transformation and geometric mean filter processing on the received imaging picture to obtain and output the corresponding order conversion picture, including: the filter sharpening device is used to perform high-pass filter sharpening processing on the received picture data.

3. The method for locating a single-phase tripping fault in a power distribution network according to claim 2, characterized in that: The method further comprises: Connecting the timing server to the feature application device, the filter sharpening device, the index enhancement device and the clarity processing device respectively, so as to provide the feature application device, the filter sharpening device, the index enhancement device and the clarity processing device with the timing services required by each of them; Among them, the timing server is connected to the feature application device, the filter sharpening device, the index enhancement device and the clarity processing device respectively to provide the feature application device, the filter sharpening device, the index enhancement device and the clarity processing device with the timing services they need respectively, including: the timing server uses the same timing clock to provide the feature application device, the filter sharpening device, the index enhancement device and the clarity processing device with the timing services they need respectively.

4. The method for locating a single-phase tripping fault in a power distribution network as claimed in claim 3, characterized in that: The timing server device uses the same timing clock to provide the required timing services to the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device respectively, including: the timing server device uses the same timing clock to provide the reference clock signals of various changing waveforms of the same timing clock to the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device respectively.

5. The method for locating a single-phase tripping fault in a power distribution network as claimed in claim 3, characterized in that: The method further comprises: A parallel data bus is connected to the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device respectively, so as to provide a parallel data communication link between any two of the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device.

6. The method for locating a single-phase tripping fault in a power distribution network according to claim 5, characterized in that: The parallel data bus is respectively connected to the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device to provide a parallel data communication link between each of the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device, including: the parallel data communication link provided between each of the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device is a 64-bit parallel data communication link.

7. The method for locating a single-phase tripping fault in a power distribution network according to claim 5, characterized in that: The parallel data bus is respectively connected to the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device to provide a parallel data communication link between each of the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device, including: the parallel data communication link provided between each of the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device is a 32-bit parallel data communication link.

8. The method for locating a single-phase tripping fault in a power distribution network according to claim 5, characterized in that: The parallel data bus is respectively connected to the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device to provide a parallel data communication link between each of the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device, including: the parallel data communication link provided between each of the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device is a 16-bit parallel data communication link.

9. The method for locating a single-phase tripping fault in a power distribution network according to claim 5, characterized in that: The parallel data bus is connected to the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device respectively to provide a parallel data communication link between the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device. The method also includes: the feature application device, the filter sharpening device, the exponential enhancement device and the clarity processing device are spaced apart by a distance less than or equal to a set distance threshold.