CN116930683A - Power distribution network line fault positioning method and system - Google Patents
Power distribution network line fault positioning method and system Download PDFInfo
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- CN116930683A CN116930683A CN202310977890.0A CN202310977890A CN116930683A CN 116930683 A CN116930683 A CN 116930683A CN 202310977890 A CN202310977890 A CN 202310977890A CN 116930683 A CN116930683 A CN 116930683A
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- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 33
- 238000005259 measurement Methods 0.000 claims abstract description 27
- 238000004590 computer program Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
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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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- 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
- G01R31/088—Aspects of digital computing
Abstract
The application discloses a method and a system for positioning a power distribution network line fault, wherein the method comprises the following steps: when a power distribution network line fails, acquiring an upstream side estimated voltage of a certain node M and an actual measurement voltage of the certain node in at least one section of the power distribution network line, and determining a failure occurrence area as a failure section M according to a first difference value between the upstream side estimated voltage of the certain node and the actual measurement voltage of the certain node and a second difference value between the downstream side estimated voltage of the certain node and the actual measurement voltage of the downstream node of the certain node; and integrating the voltage change curves of different positions on the fault section M and the voltage change curves of different positions on the branch line of the fault section M, and positioning the fault point of the fault section M. The fault on the distribution network line is positioned, and manpower and time required for maintenance are greatly reduced.
Description
Technical Field
The application belongs to the technical field of power distribution network fault positioning, and particularly relates to a power distribution network line fault positioning method and system.
Background
In recent years, the new energy access scale is greatly increased, and the requirements of the urban power grid for accessing the wind power plant and the photovoltaic power station are urgent. Because the outlet interval of the urban power grid transformer substation is limited, the new energy is connected in a grid-connected mode in a T-connected line mode, and a plurality of new energy power stations can be connected in a T-connected mode on one line. The fault location technology is a technology for measuring the distance from a fault point to a power supply side switch after a line breaks down, and is generally used for calculating the location impedance through the ratio of fault voltage to fault current, then comparing the location impedance with the line impedance, and calculating the distance from the fault point to the power supply side switch, so that operation and maintenance personnel can conveniently find the fault point, and the workload is reduced. When the line T is connected with a plurality of new energy power stations, possible fault points with the same ranging impedance are not unique, and operation and maintenance personnel need to patrol the possible fault positions one by one to find the fault points, even the whole line needs to be patrolled, so that the patrol workload is greatly increased, and the line power failure time is increased. Based on the above problems, the calculation result of the zero sequence voltage under the fault condition is adopted, and the correct fault point is positioned in a plurality of possible fault positions, so that the workload of operation and maintenance personnel is reduced, and the working efficiency is improved.
Disclosure of Invention
The application provides a power distribution network line fault positioning method and system, which are used for solving the technical problem that a fault point cannot be positioned quickly.
In a first aspect, the present application provides a method for locating a line fault of a power distribution network, including:
dividing a power distribution network line into at least one section through nodes on the line;
when a power distribution network line fails, acquiring an upstream side estimated voltage of a certain node M and an actual measurement voltage of the certain node, and acquiring a downstream side estimated voltage of the certain node and an actual measurement voltage of a downstream node M+1 of the certain node in at least one section of the power distribution network line;
determining a fault occurrence area as a fault section M according to a first difference value between an upstream side estimated voltage of a certain node and an actual measurement voltage of the certain node and a second difference value between a downstream side estimated voltage of the certain node and an actual measurement voltage of a downstream node of the certain node;
fitting voltage change curves at different positions on the fault section M according to the voltage distribution conditions of nodes on the fault section M;
fitting voltage change curves of different positions on the branch line of the fault section M according to the voltage distribution conditions of nodes on the same branch line of the fault section M;
and integrating the voltage change curves of different positions on the fault section M and the voltage change curves of different positions on the branch line of the fault section M to locate the fault point of the fault section M.
In a second aspect, the present application provides a line fault locating system for a power distribution network, which is characterized by comprising:
the division module is configured to divide a power distribution network line into at least one section through nodes on the line;
the acquisition module is configured to acquire an upstream side estimated voltage of a certain node M and an actual measurement voltage of the certain node, and an downstream side estimated voltage of the certain node and an actual measurement voltage of a downstream node M+1 of the certain node in at least one section of a distribution network line when the distribution network line fails;
a determining module configured to determine, as a fault section M, a region in which a fault occurs according to a first difference between an upstream side estimated voltage of a certain node and an actual measured voltage of the certain node and a second difference between a downstream side estimated voltage of the certain node and an actual measured voltage of a downstream node of the certain node;
the first fitting module is configured to fit voltage change curves at different positions on the fault section M according to the voltage distribution conditions of the nodes on the fault section M;
the second fitting module is configured to fit voltage change curves of different positions on the branch line of the fault section M according to the voltage distribution condition of the nodes on the same branch line of the fault section M;
the positioning module is configured to integrate the voltage change curves of different positions on the fault section M and the voltage change curves of different positions on the branch line of the fault section M, and position the fault point of the fault section M.
In a third aspect, there is provided an electronic device, comprising: the system comprises at least one processor and a memory communicatively connected with the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the steps of the power distribution network line fault location method of any one of the embodiments of the present application.
In a fourth aspect, the present application also provides a computer readable storage medium, on which a computer program is stored, the program instructions, when executed by a processor, cause the processor to perform the steps of the line fault location method for a power distribution network according to any of the embodiments of the present application.
According to the power distribution network line fault positioning method and system, after the power distribution network line is divided into a plurality of sections through nodes on the line, the sections are used as units, the sections where the fault points are located are determined firstly through comparison of the predicted voltage and the measured voltage of the upstream side and the downstream side of the target sections, then the fault points on the fault sections are determined through the estimated voltage of the upstream side and the estimated voltage of the downstream side of any point in the fault sections, finally the voltage change curves of different positions on the fault sections M and the voltage change curves of different positions on branch lines of the fault sections M are synthesized, the fault points of the fault sections M are positioned, and further the positioning of faults on the power distribution network line is realized, and the labor and time required by overhaul are greatly reduced; meanwhile, the prediction voltage at the fault section is obtained while the fault is located, and the control center can conveniently analyze and judge the type of the fault and the occurrence reason of the fault in advance through the prediction voltage, so that the maintenance efficiency is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for positioning a fault of a power distribution network according to an embodiment of the present application;
fig. 2 is a block diagram of a power distribution network line fault location system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Referring to fig. 1, a flowchart of a method for locating a fault in a power distribution network according to the present application is shown.
As shown in fig. 1, the method for locating the fault of the power distribution network line specifically includes the following steps:
in step S101, the distribution network line is divided into at least one section by nodes on the line.
Step S102, when a power distribution network line fails, obtaining an estimated voltage on an upstream side of a certain node M and an actual measurement voltage of the certain node, and an estimated voltage on a downstream side of the certain node and an actual measurement voltage of a downstream node m+1 of the certain node in at least one section of the power distribution network line.
In the step, the current from a node M on a section M on a power distribution network line to an upstream node M-1 and a downstream node M+1 of the node M is respectively obtained; respectively obtaining an upstream side estimated voltage and a downstream side estimated voltage of the node M according to the current and the impedance of the corresponding section; judging whether a first difference value between an upstream side estimated voltage of a certain node and an actual measured voltage of the certain node and a second difference value between a downstream side estimated voltage of the certain node and an actual measured voltage of a downstream node of the certain node are smaller than a preset first threshold value or not; if yes, judging that the fault point is in the section M; if not, the node M is reselected in the line on one side of the node M with the difference value larger than the threshold value.
Specifically, the obtaining the current from the node M on the section M on the distribution network line to the upstream node M-1 and the downstream node m+1 of the node M includes: acquiring the current of each node on the power distribution network line according to a preset period; judging whether the sum of the currents of all the nodes is larger than a preset setting value or not; if yes, judging that the power distribution network line fails, and respectively acquiring current from a node M to an upstream node M-1 and a downstream node M+1 of the node M; if not, judging that the power distribution network line has no fault, and calculating the impedance of each section on the power distribution network line; and obtaining the total impedance of the power distribution network line by utilizing the impedance of each section, determining the position of each node on the power distribution network line according to the total impedance and the impedance of each section, and waiting for the current of each node on the power distribution network line to be reacquired in the next period.
It should be noted that calculating the impedance of each section on the power distribution network line includes: respectively obtaining current and voltage of nodes of each section on the distribution network line; and obtaining the impedance of the section where the corresponding node is located according to the current difference and the voltage difference between the adjacent nodes.
Step S103, determining a fault occurrence area as a fault section M according to a first difference between an upstream estimated voltage of a certain node and an actual measured voltage of the certain node and a second difference between a downstream estimated voltage of the certain node and an actual measured voltage of a downstream node of the certain node.
Step S104, fitting voltage change curves at different positions on the fault section M according to the voltage distribution conditions of the nodes on the fault section M.
Step S105, fitting voltage change curves at different positions on the branch line of the fault section M according to the voltage distribution conditions of the nodes on the same branch line of the fault section M.
And S106, integrating the voltage change curves of different positions on the fault section M and the voltage change curves of different positions on the branch line of the fault section M, and positioning the fault point of the fault section M.
In the step, according to voltage change curves of different positions on a fault section M, a first locating point is found, the voltage of the first locating point is the same as the line end voltage of the fault section M, and the voltage from the voltage of a power input end to the voltage of the first locating point is in a descending trend; judging whether the first positioning point is a T-joint node, if not, the first positioning point is a fault point of the fault section M, if so, finding a second positioning point according to voltage change curves of different positions on the same branch line of the fault section M, wherein the voltage of the second positioning point is the same as the line end voltage of the branch line, the voltage from the T-joint node to the voltage of the second positioning point is in a descending trend, and taking the second positioning point as the fault point of the fault section M.
In summary, the method of the application divides the distribution network line into a plurality of sections through nodes on the line, and by taking the sections as units, the section where the fault point is located is firstly determined through the comparison of the predicted voltage and the measured voltage at the upstream side and the downstream side of the target section, then the fault point on the fault section is determined through the upstream side estimated voltage and the downstream side estimated voltage of any point in the fault section, and finally the voltage change curves at different positions on the fault section M and the voltage change curves at different positions on the branch line of the fault section M are synthesized, so that the fault point of the fault section M is positioned, thereby realizing the positioning of the fault on the distribution network line, and greatly reducing the manpower and time required by maintenance; meanwhile, the prediction voltage at the fault section is obtained while the fault is located, and the control center can conveniently analyze and judge the type of the fault and the occurrence reason of the fault in advance through the prediction voltage, so that the maintenance efficiency is further improved.
Referring to fig. 2, a block diagram of a power distribution network line fault location system according to the present application is shown.
As shown in fig. 2, the distribution network line fault location system 200 includes a partitioning module 210, an acquisition module 220, a determination module 230, a first fitting module 240, a second fitting module 250, and a location module 260.
The division module 210 is configured to divide the power distribution network line into at least one section through nodes on the line; an obtaining module 220, configured to obtain, when a power distribution network line fails, an estimated voltage on an upstream side of a certain node M and an actual measurement voltage of the certain node, and an estimated voltage on a downstream side of the certain node and an actual measurement voltage of a downstream node m+1 of the certain node in at least one section of the power distribution network line; a determining module 230 configured to determine, as a fault section M, a region in which a fault occurs according to a first difference between an upstream side estimated voltage of a certain node and an actual measured voltage of the certain node and a second difference between a downstream side estimated voltage of the certain node and an actual measured voltage of a downstream node of the certain node; a first fitting module 240 configured to fit voltage variation curves at different positions on the fault section M according to voltage distribution conditions of nodes located on the fault section M; the second fitting module 250 is configured to fit voltage change curves of different positions on the branch line of the fault section M according to the voltage distribution situation of the nodes on the same branch line of the fault section M; the positioning module 260 is configured to integrate the voltage change curves at different positions on the fault section M and the voltage change curves at different positions on the branch line of the fault section M, and position the fault point of the fault section M.
It should be understood that the modules depicted in fig. 2 correspond to the various steps in the method described with reference to fig. 1. Thus, the operations and features described above for the method and the corresponding technical effects are equally applicable to the modules in fig. 2, and are not described here again.
In other embodiments, the present application further provides a computer readable storage medium, on which a computer program is stored, where the program instructions, when executed by a processor, cause the processor to perform the method for locating a fault in a power distribution network line in any of the method embodiments described above;
as one embodiment, the computer-readable storage medium of the present application stores computer-executable instructions configured to:
dividing a power distribution network line into at least one section through nodes on the line;
when a power distribution network line fails, acquiring an upstream side estimated voltage of a certain node M and an actual measurement voltage of the certain node, and acquiring a downstream side estimated voltage of the certain node and an actual measurement voltage of a downstream node M+1 of the certain node in at least one section of the power distribution network line;
determining a fault occurrence area as a fault section M according to a first difference value between an upstream side estimated voltage of a certain node and an actual measurement voltage of the certain node and a second difference value between a downstream side estimated voltage of the certain node and an actual measurement voltage of a downstream node of the certain node;
fitting voltage change curves at different positions on the fault section M according to the voltage distribution conditions of nodes on the fault section M;
fitting voltage change curves of different positions on the branch line of the fault section M according to the voltage distribution conditions of nodes on the same branch line of the fault section M;
and integrating the voltage change curves of different positions on the fault section M and the voltage change curves of different positions on the branch line of the fault section M to locate the fault point of the fault section M.
The computer readable storage medium may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created from the use of the distribution network line fault location system, etc. In addition, the computer-readable storage medium may include high-speed random access memory, and may also include memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device. In some embodiments, the computer readable storage medium optionally includes memory remotely located with respect to the processor, the remote memory being connectable to the distribution network line fault location system through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the present application, as shown in fig. 3, where the device includes: a processor 310 and a memory 320. The electronic device may further include: an input device 330 and an output device 340. The processor 310, memory 320, input device 330, and output device 340 may be connected by a bus or other means, for example in fig. 3. Memory 320 is the computer-readable storage medium described above. The processor 310 executes various functional applications and data processing of the server by running non-volatile software programs, instructions and modules stored in the memory 320, i.e. implements the power distribution network line fault location method of the method embodiment described above. The input device 330 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the distribution network line fault location system. The output device 340 may include a display device such as a display screen.
The electronic equipment can execute the method provided by the embodiment of the application, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be found in the methods provided in the embodiments of the present application.
As an implementation manner, the electronic device is applied to a power distribution network line fault positioning system, and is used for a client, and includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executable by the at least one processor to enable the at least one processor to:
dividing a power distribution network line into at least one section through nodes on the line;
when a power distribution network line fails, acquiring an upstream side estimated voltage of a certain node M and an actual measurement voltage of the certain node, and acquiring a downstream side estimated voltage of the certain node and an actual measurement voltage of a downstream node M+1 of the certain node in at least one section of the power distribution network line;
determining a fault occurrence area as a fault section M according to a first difference value between an upstream side estimated voltage of a certain node and an actual measurement voltage of the certain node and a second difference value between a downstream side estimated voltage of the certain node and an actual measurement voltage of a downstream node of the certain node;
fitting voltage change curves at different positions on the fault section M according to the voltage distribution conditions of nodes on the fault section M;
fitting voltage change curves of different positions on the branch line of the fault section M according to the voltage distribution conditions of nodes on the same branch line of the fault section M;
and integrating the voltage change curves of different positions on the fault section M and the voltage change curves of different positions on the branch line of the fault section M to locate the fault point of the fault section M.
The apparatus embodiments described above are merely illustrative, wherein elements illustrated as separate elements may or may not be physically separate, and elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will 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 technical solutions of the embodiments of the present application.
Claims (8)
1. The utility model provides a distribution network line fault location method which is characterized in that the method comprises the following steps:
dividing a power distribution network line into at least one section through nodes on the line;
when a power distribution network line fails, acquiring an upstream side estimated voltage of a certain node M and an actual measurement voltage of the certain node, and acquiring a downstream side estimated voltage of the certain node and an actual measurement voltage of a downstream node M+1 of the certain node in at least one section of the power distribution network line;
determining a fault occurrence area as a fault section M according to a first difference value between an upstream side estimated voltage of a certain node and an actual measurement voltage of the certain node and a second difference value between a downstream side estimated voltage of the certain node and an actual measurement voltage of a downstream node of the certain node;
fitting voltage change curves at different positions on the fault section M according to the voltage distribution conditions of nodes on the fault section M;
fitting voltage change curves of different positions on the branch line of the fault section M according to the voltage distribution conditions of nodes on the same branch line of the fault section M;
and integrating the voltage change curves of different positions on the fault section M and the voltage change curves of different positions on the branch line of the fault section M to locate the fault point of the fault section M.
2. The method according to claim 1, wherein the step of obtaining the estimated voltage on the upstream side of a certain node M and the measured voltage of the certain node, and the estimated voltage on the downstream side of the certain node and the measured voltage of a node m+1 downstream of the certain node in at least one section of the distribution network comprises:
respectively acquiring current from a node M on a section M on a power distribution network line to an upstream node M-1 and a downstream node M+1 of the node M;
respectively obtaining an upstream side estimated voltage and a downstream side estimated voltage of the node M according to the current and the impedance of the corresponding section;
judging whether a first difference value between an upstream side estimated voltage of a certain node and an actual measured voltage of the certain node and a second difference value between a downstream side estimated voltage of the certain node and an actual measured voltage of a downstream node of the certain node are smaller than a preset first threshold value or not;
if yes, judging that the fault point is in the section M; if not, the node M is reselected in the line on one side of the node M with the difference value larger than the threshold value.
3. The method for locating a fault in a power distribution network according to claim 2, wherein the step of obtaining the currents from the node M on the section M of the power distribution network to the node M-1 upstream of the node M and the node m+1 downstream of the node M includes:
acquiring the current of each node on the power distribution network line according to a preset period;
judging whether the sum of the currents of all the nodes is larger than a preset setting value or not; if yes, judging that the power distribution network line fails, and respectively acquiring current from a node M to an upstream node M-1 and a downstream node M+1 of the node M;
if not, judging that the power distribution network line has no fault, and calculating the impedance of each section on the power distribution network line;
and obtaining the total impedance of the power distribution network line by utilizing the impedance of each section, determining the position of each node on the power distribution network line according to the total impedance and the impedance of each section, and waiting for the current of each node on the power distribution network line to be reacquired in the next period.
4. A method of locating a line fault in a power distribution network as claimed in claim 3, wherein said calculating the impedance of each section on the power distribution network line comprises:
respectively obtaining current and voltage of nodes of each section on the distribution network line;
and obtaining the impedance of the section where the corresponding node is located according to the current difference and the voltage difference between the adjacent nodes.
5. The method for locating a fault point of a power distribution network according to claim 1, wherein the step of integrating the voltage change curves of different positions on the fault section M and the voltage change curves of different positions on the branch line of the fault section M includes:
according to voltage change curves of different positions on the fault section M, a first locating point is found, the voltage of the first locating point is the same as the line end voltage of the fault section M, and the voltage from the voltage of the power supply input end to the first locating point is in a descending trend;
judging whether the first positioning point is a T-joint node, if not, the first positioning point is a fault point of the fault section M, if so, finding a second positioning point according to voltage change curves of different positions on the same branch line of the fault section M, wherein the voltage of the second positioning point is the same as the line end voltage of the branch line, the voltage from the T-joint node to the voltage of the second positioning point is in a descending trend, and taking the second positioning point as the fault point of the fault section M.
6. A power distribution network line fault location system, comprising:
the division module is configured to divide a power distribution network line into at least one section through nodes on the line;
the acquisition module is configured to acquire an upstream side estimated voltage of a certain node M and an actual measurement voltage of the certain node, and an downstream side estimated voltage of the certain node and an actual measurement voltage of a downstream node M+1 of the certain node in at least one section of a distribution network line when the distribution network line fails;
a determining module configured to determine, as a fault section M, a region in which a fault occurs according to a first difference between an upstream side estimated voltage of a certain node and an actual measured voltage of the certain node and a second difference between a downstream side estimated voltage of the certain node and an actual measured voltage of a downstream node of the certain node;
the first fitting module is configured to fit voltage change curves at different positions on the fault section M according to the voltage distribution conditions of the nodes on the fault section M;
the second fitting module is configured to fit voltage change curves of different positions on the branch line of the fault section M according to the voltage distribution condition of the nodes on the same branch line of the fault section M;
the positioning module is configured to integrate the voltage change curves of different positions on the fault section M and the voltage change curves of different positions on the branch line of the fault section M, and position the fault point of the fault section M.
7. An electronic device, comprising: at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 5.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method of any one of claims 1 to 5.
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| CN202310977890.0A CN116930683A (en) | 2023-08-04 | 2023-08-04 | Power distribution network line fault positioning method and system |
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| CN202310977890.0A CN116930683A (en) | 2023-08-04 | 2023-08-04 | Power distribution network line fault positioning method and system |
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