CN113945801B - Power distribution network fault positioning method, device, equipment and storage medium - Google Patents
Power distribution network fault positioning method, device, equipment and storage medium Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The application discloses a power distribution network fault positioning method, a device, equipment and a storage medium, wherein the method comprises the following steps: constructing a fault information sensing pair according to an information acquisition terminal in the power distribution network; when the trend direction in the fault information sensing pair is detected to be reverse, acquiring voltage information and current information respectively corresponding to two information acquisition terminals corresponding to the fault information sensing pair; under different fault distance variables, calculating a current signal judgment index and a voltage signal judgment index for fault positioning under the fault distance variables according to the voltage information and the current information; determining a first fault position according to all the current signal judging indexes, and determining a second fault position according to all the voltage signal judging indexes; a target fault location is determined based on the first fault location and the second fault location. The method solves the technical problems that the existing power distribution network fault positioning method can only determine the approximate area where the fault occurs and cannot accurately position the fault.
Description
Technical Field
The application relates to the technical field of power distribution networks, in particular to a power distribution network fault positioning method, a device, equipment and a storage medium.
Background
In order to ensure the stability of the power distribution network, when the power distribution network fails, the power failure needs to be removed rapidly. The fault location is helpful for operation and maintenance personnel to quickly find out fault points, shortens the duration of faults and improves the reliability of power supply.
In the prior art, fault location mainly depends on fault indicators, namely, fault indicators are installed at load switches on a main line and important branches, and whether the downstream of the fault indicators has faults or not is judged according to the color or position change of the fault indicators, so that fault section location is completed. However, since the fault indicator can only realize section positioning, the approximate area where the fault occurs is determined, and accurate positioning cannot be performed.
Disclosure of Invention
In view of the above, the application provides a power distribution network fault positioning method, a device, equipment and a storage medium, which solve the technical problems that the existing power distribution network fault positioning method can only determine the approximate area where the fault occurs and cannot perform accurate positioning.
The first aspect of the application provides a power distribution network fault positioning method, which comprises the following steps:
constructing a fault information sensing pair according to an information acquisition terminal in the power distribution network;
when the trend direction in the fault information sensing pair is detected to be reverse, acquiring voltage information and current information respectively corresponding to two information acquisition terminals corresponding to the fault information sensing pair;
under different fault distance variables, calculating a current signal judgment index and a voltage signal judgment index for fault positioning under the fault distance variables according to the voltage information and the current information;
determining a first fault position according to all the current signal judging indexes, and determining a second fault position according to all the voltage signal judging indexes;
a target fault location is determined based on the first fault location and the second fault location.
Optionally, under different fault distance variables, calculating a current signal judgment index and a voltage signal judgment index for fault location under the fault distance variables according to the voltage information and the current information, wherein the current signal judgment index and the voltage signal judgment index specifically comprise:
setting an initial fault distance variable, and calculating current difference and voltage difference at two ends of a virtual fault point measuring point according to the voltage information and the current information under the initial fault distance variable;
calculating a current signal judgment index for fault location according to the current difference, and calculating a voltage signal judgment index for fault location according to the voltage difference;
modifying the initial fault distance variable by taking a preset distance increment as a stepping length;
and judging whether the modified initial fault distance variable is larger than a preset line length, if so, jumping to the step of determining the first fault position and the second fault position, and if not, taking the modified initial fault distance as a new initial fault distance variable, and returning to the step of calculating the current difference and the voltage difference at two ends of the virtual measuring point of the fault point, wherein the preset line length is the line length between two information acquisition terminals corresponding to the fault information sensing pair.
Optionally, a current difference calculation formula corresponding to the current difference is:
wherein L is the length of a line between two information acquisition terminals i and j corresponding to a fault information perception pair (i, j), and z s Is the line unit impedance; z p Admittance in line units; i.e fi A current flowing from i to the virtual measuring point of the fault point; i.e fj For the current flowing from the virtual measuring point of the fault point to j, l s As a fault distance variable, u i For the voltage information of the information acquisition terminal i, i i For the current information of the information acquisition terminal i, u j For voltage information of information acquisition terminal j, i j And the information acquisition terminal j acquires current information.
Optionally, an index calculation formula corresponding to the current signal determination index is:
F 1s ＝log|i fi -i fj |；
wherein F is 1s Is a current signal determination index.
Optionally, the voltage difference calculation formula corresponding to the voltage difference is:
u fi -u fj ＝u i -(i i -z s l s i i )z p l s -u j -(i j +(L-l s )z s i j )z p (L-l s )；
wherein L is the length of a line between two information acquisition terminals i and j corresponding to a fault information perception pair (i, j), and z s Is the line unit impedance; z p Admittance in line units; u (u) fi Representing the voltage from i to the virtual measuring point of the fault position; u (u) fj Representing the voltage seen from the virtual measuring point at the fault location to j, l s As a fault distance variable, u i For the voltage information of the information acquisition terminal i, i i For the current information of the information acquisition terminal i, u j For voltage information of information acquisition terminal j, i j And the information acquisition terminal j acquires current information.
Optionally, the index calculation formula corresponding to the voltage signal judgment index is:
wherein F is 2s Is a voltage signal judgment index.
Optionally, determining the target fault location based on the first fault location and the second fault location specifically includes:
when the difference value between the first fault position and the second fault position is judged to be a value below a preset difference value, taking a smaller value between the first fault position and the second fault position as the target fault position;
when the difference value between the first fault position and the second fault position is larger than a preset difference value, calculating the credibility corresponding to the first fault position and the second fault position, and taking the fault position with large credibility as the target fault position.
A second aspect of the present application provides a fault location device for a power distribution network, including:
the construction unit is used for constructing fault information perception pairs according to the information acquisition terminals in the power distribution network;
the acquisition unit is used for acquiring voltage information and current information respectively corresponding to the two information acquisition terminals corresponding to the fault information sensing pair when the trend direction in the fault information sensing pair is detected to be reverse;
the calculating unit is used for calculating a current signal judgment index and a voltage signal judgment index for fault location under different fault distance variables according to the voltage information and the current information;
the first determining unit is used for determining a first fault position according to all the current signal judging indexes and determining a second fault position according to all the voltage signal judging indexes;
and a second determining unit configured to determine a target fault location based on the first fault location and the second fault location.
A third aspect of the present application provides a power distribution network fault location device, including a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute any one of the power distribution network fault locating methods according to the first aspect according to the instructions in the program code.
A fourth aspect of the present application provides a storage medium for storing program code for performing any one of the power distribution network fault location methods of the first aspect.
From the above technical scheme, the application has the following advantages:
the utility model provides a distribution network fault location method, firstly, construct fault information perception pair according to the information acquisition terminal in the distribution network, then when detecting that the trend direction in fault information perception pair is reverse, acquire voltage information and current information that two information acquisition terminals that this fault information perception pair corresponds respectively correspond, then under different fault distance variable, according to voltage information and current information, under this fault distance variable, current signal decision index and voltage signal decision index that is used for fault location are calculated, then according to all current signal decision index confirm first fault location, all voltage signal decision index confirm the second fault location, finally based on first fault location and second fault location, confirm the target fault location. The method and the device realize accurate positioning of faults based on the voltage information and the current information perceived by the original information acquisition terminal in the power distribution network, and solve the technical problems that the existing power distribution network fault positioning method only can determine the approximate area where the faults occur and cannot perform accurate positioning.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic flow chart of a first embodiment of a fault location method for a power distribution network according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a fault information sensing pair according to an embodiment of the present application;
fig. 3 is a schematic flow chart of a second embodiment of a fault location method for a power distribution network according to an embodiment of the present application;
FIG. 4 is a schematic diagram of fault localization in an embodiment of the present application;
fig. 5 is a schematic structural diagram of a fault locating device for a power distribution network according to an embodiment of the present application.
Detailed Description
The embodiment of the application provides a power distribution network fault positioning method, device, equipment and storage medium, which solve the technical problems that the existing power distribution network fault positioning method can only determine the approximate area where the fault occurs and cannot accurately position.
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
An embodiment of a power distribution network fault location method is provided in a first aspect of the present application.
Referring to fig. 1, a flowchart of a first embodiment of a fault location method for a power distribution network in an embodiment of the present application is shown.
The power distribution network fault positioning method in the embodiment comprises the following steps:
and 101, constructing a fault information sensing pair according to an information acquisition terminal in the power distribution network.
The information collection terminal is a terminal for collecting electric power information in the power distribution network, such as a power distribution automation terminal, a remote fault indicator, a situation awareness terminal, etc., and specifically, a person skilled in the art can select the information collection terminal according to needs, which is not limited herein.
Specifically, in one embodiment, the construction of the fault information awareness pair (i, j) is: and constructing a fault information sensing topological graph (shown in fig. 2) according to the information acquisition terminals in the power distribution network, and then selecting any two information acquisition terminals in the fault information sensing topological graph as fault information sensing pairs (i, j), such as the content selected in the box in fig. 2.
It will be appreciated that in further embodiments, the fault information awareness pair (i, j) is constructed as: two information acquisition terminals are selected from the information acquisition terminals in the power distribution network, and the two selected information acquisition terminals are used as fault information perception pairs (i, j).
And 102, when the trend direction in the fault information sensing pair is detected to be reverse, acquiring voltage information and current information respectively corresponding to the two information acquisition terminals corresponding to the fault information sensing pair.
The direction of the current in the fault information sensing pair (i, j) should be a predetermined direction, for example, the correct current direction in fig. 2 should be from left to right (i.e. from the information acquisition terminal i to the information acquisition terminal j), so if the current direction in the fault information sensing pair is reverse, it is indicated that a fault occurs between the fault information sensing pair (i, j), that is, a section where the fault is located is determined, and the endpoints of the section are the information acquisition terminal i and the information acquisition terminal j.
After the section where the fault is located is clearly determined, voltage information and current information at two ends of the section, namely voltage information and current information of the information acquisition terminal i and the information acquisition terminal j are acquired.
Step 103, under different fault distance variables, calculating a current signal judgment index and a voltage signal judgment index for fault positioning under the fault distance variables according to the voltage information and the current information.
It will be appreciated that after the voltage information and the current information are determined, a first fault location determined based on the current information and a second fault location determined based on the voltage information are determined between the fault information sensing pairs by changing a fault distance variable.
Wherein the first fault location and the second fault location are calculated based on the current signal determination index and the voltage signal determination index, respectively, so that the current signal determination index and the voltage signal determination index for fault location under different fault distance variables are calculated based on the voltage information and the current information under the fault distance variables
In this embodiment, a plurality of current signal determination indexes and voltage signal determination indexes may be obtained in step 103, where one fault distance variable corresponds to one current signal determination index and one voltage signal determination index. One of the fault distance variables corresponds to one possible fault location, that is, a current signal determination index and a voltage signal determination index, which correspond to each possible fault location when each possible fault location is calculated in the present embodiment.
Step 104, determining a first fault position according to all the current signal judgment indexes, and determining a second fault position according to all the voltage signal judgment indexes.
After the current signal determination index and the voltage signal determination index corresponding to each of the plurality of possible fault positions are obtained, the possible position of one fault (i.e., the first fault position) is determined according to the current signal determination index, and the possible position of one fault (i.e., the second fault position) is determined based on the voltage signal determination index.
It is understood that in one embodiment, the possible fault location corresponding to the minimum current signal determination index is set as the first fault location, and the possible fault location corresponding to the minimum voltage signal determination index is set as the second fault location.
Step 105, determining a target fault location based on the first fault location and the second fault location.
Finally, after the first fault position determined based on the current information and the second fault position determined based on the voltage information are obtained, the first fault position and the second fault position can be integrated, and the target fault position can be determined.
In this embodiment, a fault information sensing pair is firstly constructed according to information acquisition terminals in a power distribution network, then when the trend direction in the fault information sensing pair is detected to be reverse, voltage information and current information corresponding to each of two information acquisition terminals corresponding to the fault information sensing pair are acquired, then under different fault distance variables, current signal judgment indexes and voltage signal judgment indexes for fault location are calculated according to the voltage information and the current information under the fault distance variables, then a first fault position is determined according to all the current signal judgment indexes, a second fault position is determined according to all the voltage signal judgment indexes, and finally a target fault position is determined based on the first fault position and the second fault position. The method and the device realize accurate positioning of faults based on the voltage information and the current information perceived by the original information acquisition terminal in the power distribution network, and solve the technical problems that the existing power distribution network fault positioning method only can determine the approximate area where the faults occur and cannot perform accurate positioning.
The foregoing is a first embodiment of a power distribution network fault location method provided by an embodiment of the present application, and the following is a second embodiment of a power distribution network fault location method provided by an embodiment of the present application.
Referring to fig. 3, a flowchart of a second embodiment of a fault location method for a power distribution network in an embodiment of the present application is shown.
The power distribution network fault positioning method in the embodiment comprises the following steps:
and 301, constructing a fault information sensing pair according to an information acquisition terminal in the power distribution network.
It is to be understood that the description in step 301 is the same as that of step 101 in the first embodiment, and specific reference may be made to the description of step 101, which is not repeated herein.
And 302, when the trend direction in the fault information sensing pair is detected to be reverse, acquiring voltage information and current information respectively corresponding to the two information acquisition terminals corresponding to the fault information sensing pair.
It is to be understood that the description in step 302 is the same as that of step 102 in the first embodiment, and specific reference may be made to the description of step 102, which is not repeated herein.
Step 303, setting an initial fault distance variable, and calculating the current difference and the voltage difference at two ends of the virtual fault point measuring point according to the voltage information and the current information under the initial fault distance variable.
It will be appreciated that before setting the initial fault distance variable, a reference point is first set in the section where the fault is located (i.e. the fault information sensing pair), and the information acquisition terminal i may be selected as the reference point, or the information acquisition terminal j may be selected as the reference point. After the reference point is selected, based on the reference point, an initial fault distance variable, i.e., a fault potential location, is spaced from the reference point.
In one embodiment, the current difference calculation formula corresponding to the current difference is:
wherein L is the length of the line between the two information acquisition terminals i and j corresponding to the fault information perception pair (i, j) (shown in figure 4), z s Is the line unit impedance; z p Admittance in line units; i.e fi A current flowing from i to the virtual measuring point of the fault point; i.e fj For the current flowing from the virtual measuring point of the fault point to j, l s As a fault distance variable, u i For the voltage information of the information acquisition terminal i, i i For the current information of the information acquisition terminal i, u j For voltage information of information acquisition terminal j, i j And the information acquisition terminal j acquires current information.
In one embodiment, the voltage difference calculation formula corresponding to the voltage difference is:
u fi -u fj ＝u i -(i i -z s l s i i )z p l s -u j -(i j +(L-l s )z s i j )z p (L-l s )；
wherein L is the line length of the transmission line between the two information acquisition terminals i and j corresponding to the fault information perception pair (i, j), and z s Is the line unit impedance; z p Admittance in line units; u (u) fi Representing the voltage from i to the virtual measuring point of the fault position; u (u) fj Representing the voltage seen from the virtual measuring point at the fault location to j, l s As a fault distance variable, u i For the voltage information of the information acquisition terminal i, i i For the current information of the information acquisition terminal i, u j For voltage information of information acquisition terminal j, i j And the information acquisition terminal j acquires current information.
Step 304, calculating a current signal judgment index for fault location according to the current difference, and calculating a voltage signal judgment index for fault location according to the voltage difference.
It can be understood that the index calculation formula corresponding to the current signal determination index is:
F 1s ＝log|i fi -i fj |；
wherein F is 1s Is a current signal determination index.
The index calculation formula corresponding to the voltage signal judgment index is as follows:
wherein F is 2s Is a voltage signal judgment index.
Step 305, taking the preset distance increment as the step length, and modifying the initial fault distance variable.
It can be understood that the smaller the value of the preset distance increment is, the higher the positioning accuracy is, and the corresponding calculated amount may be larger at this time; if the larger the value of the preset distance increment is, the poorer the positioning precision is, and the corresponding calculated amount is smaller. As for the setting of the specific numerical values, calculation can be performed according to the analysis requirements, which is not particularly limited in the present embodiment.
Step 306, determining whether the modified initial fault distance variable is greater than the preset line length, if yes, executing step 307, if not, returning to step 303 after taking the modified initial fault distance as a new initial fault distance variable.
When the modified initial fault distance variable is greater than the preset line length, the fact that all possible fault positions are calculated by taking the preset distance increment as a variable between fault information sensing pairs (i, j) is indicated, and then the first fault position and the second fault position can be determined.
Step 307, determining a first fault location according to all the current signal determination indicators, and determining a second fault location according to all the voltage signal determination indicators.
It is to be understood that the description in step 307 is the same as the description of step 104 in the first embodiment, and specific reference may be made to the description of step 104, which is not repeated here.
And 308, when the difference value between the first fault position and the second fault position is judged to be a value below a preset difference value, taking a smaller value between the first fault position and the second fault position as a target fault position.
It is understood that the preset difference may be set as required, and this is not particularly limited in this embodiment.
And 309, when the difference between the first fault position and the second fault position is greater than the preset difference, calculating the credibility of the first fault position and the second fault position, and taking the fault position with high credibility as the target fault position.
In this embodiment, the confidence level k i The calculation formula of (2) is as follows:
wherein beta is i For critical coefficient, i=1, then F is ＝F 1s Indicating fault location current signal decision index, beta i ＝β 1 Critical coefficient, k representing fault locating current signal decision index i ＝k 1 Representing the credibility corresponding to the first fault position; i=2, then F is ＝F 2s Indicating fault location voltage signal decision index, beta i ＝β 2 Critical coefficient, k representing fault locating voltage signal judging index i ＝k 2 Indicating the confidence level corresponding to the second fault location.
In this embodiment, a fault information sensing pair is firstly constructed according to information acquisition terminals in a power distribution network, then when the trend direction in the fault information sensing pair is detected to be reverse, voltage information and current information corresponding to each of two information acquisition terminals corresponding to the fault information sensing pair are acquired, then under different fault distance variables, current signal judgment indexes and voltage signal judgment indexes for fault location are calculated according to the voltage information and the current information under the fault distance variables, then a first fault position is determined according to all the current signal judgment indexes, a second fault position is determined according to all the voltage signal judgment indexes, and finally a target fault position is determined based on the first fault position and the second fault position. The method and the device realize accurate positioning of faults based on the voltage information and the current information perceived by the original information acquisition terminal in the power distribution network, and solve the technical problems that the existing power distribution network fault positioning method only can determine the approximate area where the faults occur and cannot perform accurate positioning.
A second aspect of the embodiments of the present application provides an embodiment of a fault location device for a power distribution network.
Referring to fig. 5, a schematic structural diagram of a fault location device for a power distribution network in an embodiment of the present application is shown.
The power distribution network fault positioning device in this embodiment includes:
a construction unit 501, configured to construct a fault information sensing pair according to an information acquisition terminal in the power distribution network;
the acquiring unit 502 is configured to acquire voltage information and current information corresponding to each of two information acquisition terminals corresponding to a fault information sensing pair when it is detected that a direction of a tide in the fault information sensing pair is reverse;
a calculating unit 503, configured to calculate, under different fault distance variables, a current signal determination index and a voltage signal determination index for fault location under the fault distance variables according to the voltage information and the current information;
a first determining unit 504, configured to determine a first fault location according to all the current signal determination indicators, and determine a second fault location according to all the voltage signal determination indicators;
a second determining unit 505 for determining a target fault location based on the first fault location and the second fault location.
Further, the computing unit 503 specifically includes:
the first calculating subunit is used for setting an initial fault distance variable and calculating the current difference and the voltage difference at two ends of the virtual measuring point of the fault point according to the voltage information and the current information under the initial fault distance variable;
a second calculating subunit for calculating a current signal judgment index for fault location according to the current difference and a voltage signal judgment index for fault location according to the voltage difference;
the modification subunit is used for modifying the initial fault distance variable by taking the preset distance increment as the step length;
and the first judging subunit is used for judging whether the modified initial fault distance variable is larger than the preset line length, if so, jumping to the step of determining the first fault position and the second fault position, and if not, returning to the step of calculating the current difference and the voltage difference at the two ends of the virtual measuring point of the fault point after taking the modified initial fault distance as a new initial fault distance variable, wherein the preset line length is the line length between the two information acquisition terminals corresponding to the fault information sensing pair.
Further, a current difference calculation formula corresponding to the current difference is:
wherein L is two information acquisition terminals i and j corresponding to the fault information perception pair (i, j)Length of line between z s Is the line unit impedance; z p Admittance in line units; i.e fi A current flowing from i to the virtual measuring point of the fault point; i.e fj For the current flowing from the virtual measuring point of the fault point to j, l s As a fault distance variable, u i For the voltage information of the information acquisition terminal i, i i For the current information of the information acquisition terminal i, u j For voltage information of information acquisition terminal j, i j And the information acquisition terminal j acquires current information.
Specifically, an index calculation formula corresponding to the current signal determination index is:
F 1s ＝log|i fi -i fj |；
wherein F is 1s Is a current signal determination index.
Specifically, the voltage difference calculation formula corresponding to the voltage difference is:
u fi -u fj ＝u i -(i i -z s l s i i )z p l s -u j -(i j +(L-l s )z s i j )z p (L-l s )；
wherein L is the length of a line between two information acquisition terminals i and j corresponding to a fault information perception pair (i, j), and z s Is the line unit impedance; z p Admittance in line units; u (u) fi Representing the voltage from i to the virtual measuring point of the fault position; u (u) fj Representing the voltage seen from the virtual measuring point at the fault location to j, l s As a fault distance variable, u i For the voltage information of the information acquisition terminal i, i i For the current information of the information acquisition terminal i, u j For voltage information of information acquisition terminal j, i j And the information acquisition terminal j acquires current information.
Optionally, an index calculation formula corresponding to the voltage signal determination index is:
in the method, in the process of the invention,F 2s is a voltage signal judgment index.
Further, the second determining unit 505 specifically includes:
a first determination subunit configured to, when it is determined that the difference between the first failure location and the second failure location is a value below a preset difference, take a smaller value between the first failure location and the second failure location as a target failure location;
and the second determining subunit is used for calculating the credibility corresponding to the first fault position and the second fault position when judging that the difference value between the first fault position and the second fault position is larger than the preset difference value, and taking the fault position with large credibility as the target fault position.
In this embodiment, a fault information sensing pair is firstly constructed according to information acquisition terminals in a power distribution network, then when the trend direction in the fault information sensing pair is detected to be reverse, voltage information and current information corresponding to each of two information acquisition terminals corresponding to the fault information sensing pair are acquired, then under different fault distance variables, current signal judgment indexes and voltage signal judgment indexes for fault location are calculated according to the voltage information and the current information under the fault distance variables, then a first fault position is determined according to all the current signal judgment indexes, a second fault position is determined according to all the voltage signal judgment indexes, and finally a target fault position is determined based on the first fault position and the second fault position. The method and the device realize accurate positioning of faults based on the voltage information and the current information perceived by the original information acquisition terminal in the power distribution network, and solve the technical problems that the existing power distribution network fault positioning method only can determine the approximate area where the faults occur and cannot perform accurate positioning.
A third aspect of the embodiments of the present application provides an embodiment of a power distribution network fault location device.
A power distribution network fault locating device comprises a processor and a memory; the memory is used for storing the program codes and transmitting the program codes to the processor; the processor is configured to perform the power distribution network fault location method of the first aspect according to instructions in the program code.
A fourth aspect of the present embodiments provides an embodiment of a storage medium.
A storage medium for storing program code for performing the power distribution network fault location method of the first aspect.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the apparatus and units described above may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, e.g., the division of units is merely a logical function division, and there may be additional divisions in actual implementation, e.g., multiple units or components may be combined or integrated into another grid network to be installed, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a Read-only memory (ROM), a random access memory (RAM, randomAccessMemory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. The utility model provides a distribution network fault location method which is characterized in that the method comprises the following steps:
constructing a fault information sensing pair according to an information acquisition terminal in the power distribution network;
when the trend direction in the fault information sensing pair is detected to be reverse, acquiring voltage information and current information respectively corresponding to two information acquisition terminals corresponding to the fault information sensing pair;
under different fault distance variables, calculating a current signal judgment index and a voltage signal judgment index for fault positioning under the fault distance variables according to the voltage information and the current information;
determining a first fault position according to all the current signal judging indexes, and determining a second fault position according to all the voltage signal judging indexes;
determining a target fault location based on the first fault location and the second fault location;
under different fault distance variables, calculating a current signal judgment index and a voltage signal judgment index for fault location under the fault distance variables according to the voltage information and the current information, wherein the current signal judgment index and the voltage signal judgment index specifically comprise:
setting an initial fault distance variable, and calculating current difference and voltage difference at two ends of a virtual fault point measuring point according to the voltage information and the current information under the initial fault distance variable;
calculating a current signal judgment index for fault location according to the current difference, and calculating a voltage signal judgment index for fault location according to the voltage difference;
modifying the initial fault distance variable by taking a preset distance increment as a stepping length;
and judging whether the modified initial fault distance variable is larger than a preset line length, if so, jumping to the step of determining the first fault position and the second fault position, and if not, taking the modified initial fault distance as a new initial fault distance variable, and returning to the step of calculating the current difference and the voltage difference at two ends of the virtual measuring point of the fault point, wherein the preset line length is the line length between two information acquisition terminals corresponding to the fault information sensing pair.
2. The power distribution network fault location method according to claim 1, wherein the current difference calculation formula corresponding to the current difference is:
wherein L is the length of a line between two information acquisition terminals i and j corresponding to a fault information perception pair (i, j), and z s Is the line unit impedance; z p Admittance in line units; i.e fi A current flowing from i to the virtual measuring point of the fault point; i.e fj For the current flowing from the virtual measuring point of the fault point to j, l s As a fault distance variable, u i For the voltage information of the information acquisition terminal i, i i For the current information of the information acquisition terminal i, u j For voltage information of information acquisition terminal j, i j And the information acquisition terminal j acquires current information.
3. The power distribution network fault location method according to claim 2, wherein the index calculation formula corresponding to the current signal determination index is:
F 1s ＝log|i fi -i fj |；
wherein F is 1s Is a current signal determination index.
4. The power distribution network fault location method according to claim 1, wherein the voltage difference calculation formula corresponding to the voltage difference is:
u fi -u fj ＝u i -(i i -z s l s i i )z p l s -u j -(i j +(L-l s )z s i j )z p (L-l s )；
wherein L is the length of a line between two information acquisition terminals i and j corresponding to a fault information perception pair (i, j), and z s Is the line unit impedance; z p Admittance in line units; u (u) fi Representing the voltage from i to the virtual measuring point of the fault position; u (u) fj Representing the voltage seen from the virtual measuring point at the fault location to j, l s As a fault distance variable, u i For the voltage information of the information acquisition terminal i, i i For the current information of the information acquisition terminal i, u j For voltage information of information acquisition terminal j, i j And the information acquisition terminal j acquires current information.
5. The power distribution network fault location method according to claim 4, wherein the index calculation formula corresponding to the voltage signal determination index is:
wherein F is 2s Is a voltage signal judgment index.
6. The power distribution network fault location method according to claim 1, wherein determining a target fault location based on the first fault location and the second fault location, specifically comprises:
when the difference value between the first fault position and the second fault position is judged to be a value below a preset difference value, taking a smaller value between the first fault position and the second fault position as the target fault position;
when the difference value between the first fault position and the second fault position is larger than a preset difference value, calculating the credibility corresponding to the first fault position and the second fault position, and taking the fault position with large credibility as the target fault position.
7. A power distribution network fault locating device, comprising:
the construction unit is used for constructing fault information perception pairs according to the information acquisition terminals in the power distribution network;
the acquisition unit is used for acquiring voltage information and current information respectively corresponding to the two information acquisition terminals corresponding to the fault information sensing pair when the trend direction in the fault information sensing pair is detected to be reverse;
the calculating unit is used for calculating a current signal judgment index and a voltage signal judgment index for fault location under different fault distance variables according to the voltage information and the current information;
the first determining unit is used for determining a first fault position according to all the current signal judging indexes and determining a second fault position according to all the voltage signal judging indexes;
a second determining unit configured to determine a target fault location based on the first fault location and the second fault location;
under different fault distance variables, calculating a current signal judgment index and a voltage signal judgment index for fault location under the fault distance variables according to the voltage information and the current information, wherein the current signal judgment index and the voltage signal judgment index specifically comprise:
setting an initial fault distance variable, and calculating current difference and voltage difference at two ends of a virtual fault point measuring point according to the voltage information and the current information under the initial fault distance variable;
calculating a current signal judgment index for fault location according to the current difference, and calculating a voltage signal judgment index for fault location according to the voltage difference;
modifying the initial fault distance variable by taking a preset distance increment as a stepping length;
and judging whether the modified initial fault distance variable is larger than a preset line length, if so, jumping to the step of determining the first fault position and the second fault position, and if not, taking the modified initial fault distance as a new initial fault distance variable, and returning to the step of calculating the current difference and the voltage difference at two ends of the virtual measuring point of the fault point, wherein the preset line length is the line length between two information acquisition terminals corresponding to the fault information sensing pair.
8. The fault positioning device for the power distribution network is characterized by comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to perform the power distribution network fault location method of any one of claims 1 to 6 according to instructions in the program code.
9. A storage medium for storing program code for performing the power distribution network fault location method of any one of claims 1 to 6.
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