CN114675134A - Power distribution network fault positioning method and system based on traveling wave space-time matrix - Google Patents
Power distribution network fault positioning method and system based on traveling wave space-time matrix 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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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/14—Receivers specially adapted for specific applications
Abstract
The invention provides a power distribution network fault positioning method and system based on a traveling wave space-time matrix, and relates to the technical field of digital power. According to the invention, the initial traveling wave signal is injected into the power distribution network, and the measurement devices on each sub-path of the power distribution network are utilized to check the initial traveling wave signal, so that the identification and verification of the topological relation of the power distribution network are realized; on the basis, extracting the geographical position of the power distribution network through a measuring device, and fusing the topological relation of the power distribution network to establish a space-time coupling matrix; thereby realizing the collection of the space-time coupling information; then, determining the specific position of a fault point in the power distribution network through fault traveling wave time difference analysis and fault traveling wave time difference distance measurement calculation; finally, correcting the fault position information of the power distribution network through fault traveling wave time difference data of other measuring devices to complete the positioning of fault points; compared with the prior art, the method comprises the following steps: the remote unmanned rapid positioning method can be used for remotely and rapidly positioning the fault point of the power distribution network, and has good practical value in large-range power distribution network scenes.
Description
Technical Field
The invention relates to the technical field of digital electric power, in particular to a power distribution network fault positioning method and system based on a traveling wave space-time matrix.
Background
With the rapid development of Chinese economy, the power demand is continuously increased, and the scale of the power distribution network is gradually enlarged. The geographical distribution of the Chinese 10kV power distribution network is wide, the line length of part of the 10kV power distribution network exceeds 100 kilometers, and the power distribution network inspection and fault finding time consumption is long. The Chinese 10kV power distribution network operates in a mode that a neutral point is not grounded or is grounded through an arc suppression coil, after 10kV power distribution network single-phase grounding faults caused by tree and forest fire lightning strike, the 10kV power distribution network does not form short circuits, line voltages are still symmetrical, and the 10kV power distribution network can operate with faults. However, after the 10kV power distribution network is grounded in a single phase, the non-fault phase voltage is increased, and potential safety hazards are brought to the power distribution network. Therefore, after the 10kV power distribution network fails, the fault position needs to be located as soon as possible so as to be handled by a power supply company.
A lot of studies are made on 10kV distribution network fault location by many scholars at home and abroad, and the two types of main subsection location and accurate location are realized. The regional positioning method adopts a transient zero-sequence current wide area comparison method for positioning, and after the 10kV power distribution network fails, the transient zero-sequence current of a fault point is checked through a fault indicator, so that the section of the 10kV power distribution network where the fault occurs is judged. In the literature, a 10kV power distribution network fault positioning method based on transient zero-sequence current characteristics is proposed, wherein concave-convex characteristics of zero-sequence current transient waveforms of fault points of a power distribution line are detected through a fault indicator, so that sections of faults of the 10kV power distribution network are judged. In the existing literature, 10kV power distribution network cable fault detection is performed through transient zero sequence current, so that a 10kV power distribution network fault section is judged. However, one fault indicator is installed in about 5 kilometers of a 10kV distribution line, and if a single-phase earth fault of a 10kV distribution network occurs, the fault needs to be checked within a range of 5 kilometers, which is long in time consumption.
The accurate positioning method adopts a fault traveling wave method to carry out power grid fault positioning. In the existing document, a single-end traveling wave method is adopted to carry out power grid fault location, the method carries out power grid fault location on wave head attenuation characteristics of fault traveling waves and reflected waves and time length of arriving at a measuring device, and the location precision reaches 120 meters. In the existing literature, a double-end traveling wave method is adopted to carry out power grid fault location, and the position of a fault is determined by determining the time difference of a fault traveling wave reaching a measuring device at two ends of the fault through a power grid fault traveling wave wavelet maximum value. However, the above research is mainly applied to the power transmission line with a simple grid structure, the number of branch T-shaped contacts of the 10kV power distribution line is large, the number of reflected waves of the waveform reaching the measuring device is large, and the measuring error is large.
Therefore, there is a need to provide a method and a system for power distribution network fault location based on a traveling wave space-time matrix to solve one of the above technical problems.
Disclosure of Invention
In order to solve one of the above technical problems, the present invention provides a power distribution network fault location method based on a traveling wave space-time matrix, wherein a traveling wave signal transmitting device is arranged at the head end of the power distribution network, and at least one measuring device is arranged on each sub-path of the power distribution network, and the measuring devices are used for detecting traveling wave signals; after the device is installed, the position of a fault point in the power distribution network is positioned through a power distribution network topology identification step, a space-time coupling matrix creation step and a power distribution network fault positioning step.
Specifically, the power distribution network topology identification step: identifying and verifying the topological relation of the power distribution network topology according to the initial traveling wave signal propagation time difference in the power distribution network; the method comprises the steps of injecting an initial traveling wave signal, establishing an initial traveling wave time difference analysis table, identifying a distribution network topological relation and verifying the distribution network topological relation.
Specifically, the space-time coupling matrix creating step: extracting the geographical position of the power distribution network through a measuring device, and establishing a space-time coupling matrix by fusing the topological relation of the power distribution network; the method comprises the steps of measuring device clock synchronization, measuring device geographical position extraction, fault traveling wave head time extraction and fault space-time coupling matrix creation.
Specifically, the power distribution network fault positioning method comprises the following steps: the system is used for positioning the fault through a fault traveling wave signal and a space-time coupling matrix after the power distribution network fails; the method comprises the steps of fault traveling wave time difference analysis, fault traveling wave time difference distance measurement calculation, fault traveling wave positioning correction and power distribution network fault positioning result output.
As a further solution, the initial traveling wave signal injection and the initial traveling wave time difference analysis table are established by the following steps:
a1, injecting an initial traveling wave signal into the power distribution network through a traveling wave signal transmitting device;
a2 initial traveling wave signal is transmitted to the tail end of the distribution network from the head end of the distribution network;
a3 each measuring device receives the initial traveling wave signal and records the arrival time of the traveling wave head of the initial traveling wave signal to obtain
Wave head data time points;
a4 forming initial travelling wave time difference analysis table H by each wave head data time pointa：
Ha＝[Y1,Y2-Y1,Y3-Y2,...,Yn-Yn-1]
Wherein n represents the number of measuring devices, Yn represents the time point of the wave head data obtained by the nth measuring device.
As a further solution, the topological relation of the power distribution network is identified by the following steps:
b1 obtaining initial travelling wave time difference analysis table Ha；
B2 obtaining the transmission speed s of the initial travelling wave signal in the distribution network linea；
B3, calculating the space distance of each line in the power distribution network line and establishing a line space distance matrix Oa：
Oa＝[Y1×sa,(Y2-Y1)×sa,...,(Yn-Yn-1)×sa]
Wherein n represents the number of measuring devices, Yn is the time point of wave head data obtained by the n-th measuring device, saThe transmission rate of the initial traveling wave signal in the power distribution network line is obtained;
b4 matrix of line space distances OaAnd outputting to finish the identification of the topological relation of the power distribution network.
As a further solution, the topological relation of the power distribution network is verified by the following steps:
c1 obtaining a line space distance matrix Oa；
C2, injecting a verification traveling wave signal into the power distribution network;
c3, each measuring device receives the verification traveling wave signal and records the arrival time of the traveling wave head of the verification traveling wave signal to obtain the data time point of the verification wave head;
c4 forming a verification travelling wave time difference analysis table through each verification wave head data time point;
c5 establishes a line space distance verification matrix Ob；
C6 comparative line space distance matrix OaVerification matrix O of spatial distance from linebAll the sub-item differences are within the error threshold value, the distribution network is considered to be expandedThe flapping relation is unchanged and verified through the topological relation of the power distribution network; and if the difference exceeds the error threshold value, the topological relation of the power distribution network is considered to be changed, and the topological relation of the power distribution network is updated.
As a further solution, a fault analysis master station is deployed at a remote end, and a GPS positioning module and a communication module are deployed in the measuring device; and each measuring device acquires the position information through a GPS positioning module and establishes communication connection with the fault analysis master station through a communication module.
As a further solution, the GPS positioning module is a big dipper positioning module, which can connect a big dipper time synchronizing system and a big dipper positioning system, and perform measurement device clock synchronization and measurement device geographical position extraction by the following steps:
d1 the failure analysis master station sends clock time setting commands to each measuring device through the communication module;
d2 each measuring device sends a clock command to the Beidou time synchronization system;
d3 the Beidou time synchronization system issues standard time to each measuring device;
d4, each measuring device sets the issuing standard time as an internal clock, returns to the fault analysis master station and completes the clock synchronization of the measuring devices;
d5 the failure analysis master station sends a geographic position extraction command to each measuring device through a communication module;
d6 each measuring device requests the Beidou positioning system to issue a geographic position instruction;
d7 the Beidou positioning system sends geographic position information to each measuring device;
d8, each measuring device receives the geographical position information, and stamps a time stamp through standard time to obtain space-time coupling information;
and D9 the fault analysis master station receives the space-time coupling information of each measuring device to finish the extraction of the geographical position of the measuring device.
As a further solution, the fault traveling wave head time extraction and the fault space-time coupling matrix creation are carried out by the following steps:
e1, each measuring device continuously detects fault traveling wave signals in the power distribution network, records detected space-time coupling information and uploads the detected space-time coupling information to a fault analysis main station, wherein the timestamp corresponds to the wave head time of the fault traveling wave signals;
e2 when a fault occurs in the power distribution network, the fault analysis master station calls the space-time coupling information of each measuring device in the fault occurrence period;
e3 sequencing the space-time coupling information according to the serial number of the measuring device to obtain a fault space-time coupling matrix Ka：
Wherein n represents the number of measuring devices; tn represents the wave head time of the wave head of the fault traveling wave signal detected by the nth measuring device; an represents the geographical position information of the wave head of the fault traveling wave signal detected by the nth measuring device.
As a further solution, the fault traveling wave time difference analysis and the fault traveling wave time difference distance measurement calculation are carried out by the following steps:
f1, selecting a measuring device for detecting fault traveling wave signals of each sub-path of the power distribution network firstly;
f2, identifying the topological relation of the power distribution network, and calculating the line space distance between every two selected measuring devices;
f3 obtains the shortest value of the line space distance between two and uses it as the reference distance Lmin of the double-end traveling wave ranging, that is:
wherein n isbThe line spacing between every two selected measuring devices is obtained;
f4 obtaining wave head time T of detected fault traveling wave signal wave head corresponding to reference distance Lmin measuring deviceaAnd TbWherein, TaRepresents the wave head time, T, of the nearest measurement devicebIs shown inMeasuring the wave head time of the device;
f5 calculating distance L between fault point and nearest measuring device by double-end traveling wave distance measurementaDistance L from fault point to next-nearest measuring deviceb：
Wherein S isbRepresenting the propagation rate of the fault traveling wave signal in the power distribution network; lmin denotes the reference distance; t isaRepresents the wave head time, T, of the nearest measurement devicebRepresenting the wave head time of the next-nearest measuring device;
f6 distance L from fault point to nearest measuring deviceaDistance L between the fault point and the next nearest measuring devicebAnd the specific position of the fault point in the power distribution network can be determined by the time-space coupling information corresponding to the measuring device and the topological relation of the power distribution network.
As a further solution, the non-selected measuring devices are paired pairwise, fault traveling wave time difference distance measurement calculation is performed to obtain a fault point correction position, and fault traveling wave positioning correction is performed on a specific position through the fault point correction position.
A power distribution network fault positioning system based on a traveling wave space-time matrix runs on hardware equipment, and positioning of power distribution network fault points is achieved through the power distribution network fault positioning method based on the traveling wave space-time matrix.
Compared with the related technology, the power distribution network fault positioning method based on the traveling wave space-time matrix has the following beneficial effects:
1. according to the invention, the initial traveling wave signal is injected into the power distribution network, and the measurement devices on each sub-path of the power distribution network are utilized to check the initial traveling wave signal, so that the identification and verification of the topological relation of the power distribution network are realized; the identification of the topological relation of the power distribution network can provide a basis for positioning the fault point, and the verification of the topological relation of the power distribution network can ensure the positioning accuracy;
2. the invention extracts the geographical position of the power distribution network through the measuring device and establishes a space-time coupling matrix by fusing the topological relation of the power distribution network, thereby realizing the acquisition of space-time coupling information; and used in subsequent positioning;
3. the method comprises the steps of determining the specific position of a fault point in the power distribution network through fault traveling wave time difference analysis and fault traveling wave time difference distance measurement calculation; finally, correcting the fault position information of the power distribution network through fault traveling wave time difference data of other measuring devices to complete the positioning of fault points; compared with the prior art, the method comprises the following steps: the power distribution network fault point can be remotely and rapidly positioned by no person, and the power distribution network fault point has good practical value in a large-range power distribution network scene; manual work is not needed to be checked one by one, and the fault positioning time is shortened, so that the normal operation of the whole power distribution network is ensured.
Drawings
FIG. 1 is a flow chart of a preferred embodiment of a method for locating faults in a power distribution network based on a traveling wave space-time matrix according to the present invention;
fig. 2 is a schematic diagram of a power distribution network structure in accordance with a preferred embodiment of the power distribution network fault location method based on a traveling wave space-time matrix provided by the present invention;
fig. 3 is a schematic diagram of a power distribution network fault in the preferred embodiment of the power distribution network fault location method based on the traveling wave space-time matrix provided by the present invention.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
As shown in fig. 1 to fig. 3, in the method for positioning a fault of a power distribution network based on a traveling wave space-time matrix according to the present invention, a traveling wave signal transmitting device is disposed at a head end of the power distribution network, and at least one measuring device is disposed on each sub-path of the power distribution network, the measuring device being configured to detect a traveling wave signal; after the device is installed, the position of a fault point in the power distribution network is positioned through a power distribution network topology identification step, a space-time coupling matrix creation step and a power distribution network fault positioning step.
Specifically, the power distribution network topology identification step: identifying and verifying the topological relation of the power distribution network topology according to the initial traveling wave signal propagation time difference in the power distribution network; the method comprises the steps of injecting an initial traveling wave signal, establishing an initial traveling wave time difference analysis table, identifying a distribution network topological relation and verifying the distribution network topological relation.
Specifically, the space-time coupling matrix creating step: extracting the geographical position of the power distribution network through a measuring device, and establishing a space-time coupling matrix by fusing the topological relation of the power distribution network; the method comprises the steps of measuring device clock synchronization, measuring device geographical position extraction, fault traveling wave head time extraction and fault space-time coupling matrix creation.
Specifically, the power distribution network fault positioning method comprises the following steps: the system is used for positioning the fault through a fault traveling wave signal and a space-time coupling matrix after the power distribution network fails; the method comprises the steps of fault traveling wave time difference analysis, fault traveling wave time difference distance measurement calculation, fault traveling wave positioning correction and power distribution network fault positioning result output.
It should be noted that: the 10kV distribution network in china operates in a multi-section multi-contact manner, as shown in fig. 2, the present embodiment is described by taking a 10kV distribution network line as an example, and the 10kV distribution network includes two substations, two isolating switches, a main line, a plurality of branch lines, and 12 measuring devices.
As a further solution, the initial traveling wave signal injection and the initial traveling wave time difference analysis table are established by the following steps:
a1, injecting an initial traveling wave signal into the power distribution network through a traveling wave signal transmitting device;
a2 initial traveling wave signal is transmitted to the tail end of the distribution network from the head end of the distribution network;
a3 each measuring device receives the initial traveling wave signal and records the arrival time of the traveling wave head of the initial traveling wave signal to obtain
Wave head data time points;
a4 forming initial travelling wave time difference analysis table H by each wave head data time pointa：
Ha＝[Y1,Y2-Y1,Y3-Y2,...,Yn-Yn-1]
Wherein n represents the number of measuring devices, Yn represents the time point of the wave head data obtained by the nth measuring device.
It should be noted that: as shown in fig. 2, the 10kV distribution network is divided into three sections by two isolating switches, and a 0-12 distribution line measuring device is installed. Firstly, a traveling wave signal transmitting device at the head end of the No. 1 transformer substation transmits an initial traveling wave signal to a distribution line, and after the other 12 measuring devices receive the initial traveling wave signal, the wave head time point of the received initial traveling wave signal is recorded to form an initial traveling wave time difference analysis table.
As a further solution, the topological relation of the power distribution network is identified by the following steps:
b1 obtaining initial travelling wave time difference analysis table Ha；
B2 obtaining the transmission rate s of the initial travelling wave signal in the power distribution network linea；
B3, calculating the space distance of each line in the power distribution network line and establishing a line space distance matrix Oa：
Oa＝[Y1×sa,(Y2-Y1)×sa,...,(Yn-Yn-1)×sa]
Wherein n represents the number of measuring devices, and the time point of the wave head data obtained by the Yn nth measuring device, saThe transmission rate of the initial traveling wave signal in the power distribution network line is obtained;
b4 matrix of line space distances OaAnd outputting to finish the identification of the topological relation of the power distribution network.
As a further solution, the topological relation of the power distribution network is verified by the following steps:
c1 obtaining a line space distance matrix Oa；
C2, injecting a verification traveling wave signal into the power distribution network;
c3, each measuring device receives the verification traveling wave signal and records the arrival time of the traveling wave head of the verification traveling wave signal to obtain the data time point of the verification wave head;
c4 forming a verification travelling wave time difference analysis table through each verification wave head data time point;
c5 establishes a line space distance verification matrix Ob；
C6 contrast line space distance matrix OaVerification matrix O of spatial distance from linebIf the differences are within the error threshold, the topological relation of the power distribution network is considered to be unchanged, and the verification is carried out through the topological relation of the power distribution network; and if the difference exceeds the error threshold value, the topological relation of the power distribution network is considered to be changed, and the topological relation of the power distribution network is updated.
It should be noted that: since the operation condition of the 10kV power distribution network is complex, the topological relation of the power distribution network is easy to change, and if the original topological relation of the power distribution network is still used for positioning when the topological relation of the power distribution network changes, the final positioning result may be affected, so that the topological relation of the power distribution network needs to be verified before the fault point is positioned, so as to keep the topological relation of the power distribution network updated in real time.
As a further solution, a fault analysis master station is deployed at a remote end, and a GPS positioning module and a communication module are deployed in the measuring device; and each measuring device acquires the position information through the GPS positioning module and establishes communication connection with the fault analysis master station through the communication module.
As a further solution, the GPS positioning module is a big dipper positioning module, and the big dipper positioning module can connect big dipper time tick system and big dipper positioning system to carry out measuring device clock synchronization and measuring device geographical position through the following steps and extract:
d1 the failure analysis master station sends clock time setting commands to each measuring device through the communication module;
d2 each measuring device sends a clock command to the Beidou time synchronization system;
d3 the Beidou time synchronization system issues standard time to each measuring device;
d4, each measuring device sets the issuing standard time as an internal clock, returns to the fault analysis master station and completes the clock synchronization of the measuring devices;
d5 the failure analysis master station sends a geographic position extraction command to each measuring device through a communication module;
d6 each measuring device requests the Beidou positioning system to issue a geographic position instruction;
d7 the Beidou positioning system sends geographic position information to each measuring device;
d8, each measuring device receives the geographical position information, and stamps a time stamp through standard time to obtain space-time coupling information;
and D9 the fault analysis master station receives the space-time coupling information of each measuring device to finish the extraction of the geographical position of the measuring device.
It should be noted that: the measuring device provided in the embodiment realizes the clock synchronization of the measuring device for the No. 0 to No. 12 10kV power distribution network through the Beidou technology. Firstly, a power distribution network traveling wave fault analysis master station sends clock timing commands to No. 0 to No. 12 measurement devices, and each measurement device requests a Beidou time synchronization system to send clock commands. And finally, the Beidou time synchronization system respectively issues standard time to No. 0 to No. 12 power distribution network measurement devices. And then, acquiring the installation information of the power distribution network measuring device through the 10kV power distribution network installation pole number of the power distribution network measuring device. Secondly, the power distribution network measuring device requests coordinate position information from the Beidou position system and reports the obtained coordinate position information to the power distribution network traveling wave fault analysis master station.
As a further solution, the fault traveling wave head time extraction and the fault space-time coupling matrix creation are carried out by the following steps:
e1, each measuring device continuously detects fault traveling wave signals in the power distribution network, records detected space-time coupling information and uploads the detected space-time coupling information to a fault analysis main station, wherein the timestamp corresponds to the wave head time of the fault traveling wave signals;
e2 when a fault occurs in the power distribution network, the fault analysis master station calls the space-time coupling information of each measuring device in the fault occurrence period;
e3 sequencing the space-time coupling information according to the serial number of the measuring device to obtain a fault space-time coupling matrix Ka：
Wherein n represents the number of measuring devices; tn represents the wave head time of the wave head of the fault traveling wave signal detected by the nth measuring device; an represents the geographical position information of the wave head of the fault traveling wave signal detected by the nth measuring device.
It should be noted that: as shown in fig. 3, after a 10kV distribution network fails, the generated fault traveling wave diverges and propagates from the fault point to both ends, and the longer the propagation distance is, the longer the time consumption is, and the larger the attenuation is. When any power distribution network measuring device monitors that a 10kV power distribution network has a fault, all measuring devices in the power distribution network are cooperatively controlled to start, and 0-12 power distribution network measuring devices receive wave head time points of fault traveling waves and establish wave head time points, geographical coordinate information of the power distribution network measuring devices and pole number information of hung distribution lines to establish a space-time coupling matrix.
As a further solution, the fault traveling wave time difference analysis and the fault traveling wave time difference distance measurement calculation are carried out by the following steps:
f1, selecting a measuring device for detecting fault traveling wave signals of each sub-path of the power distribution network firstly;
f2, identifying the topological relation of the power distribution network, and calculating the line space distance between every two selected measuring devices;
f3 obtains the shortest value of the line space distance between two and uses it as the reference distance Lmin of the double-end traveling wave ranging, that is:
wherein n isbThe line spacing between every two selected measuring devices is obtained;
f4 obtaining wave head time T of detected fault traveling wave signal wave head corresponding to reference distance Lmin measuring deviceaAnd TbWherein, TaRepresents the wave head time, T, of the nearest measurement devicebRepresenting the wave head time of the next-nearest measuring device;
f5 calculating distance L between fault point and nearest measuring device by double-end traveling wave distance measurementaDistance L from fault point to next-nearest measuring deviceb：
Wherein S isbRepresenting the propagation rate of the fault traveling wave signal in the power distribution network; lmin denotes the reference distance; t isaRepresents the wave head time, T, of the nearest measurement devicebRepresenting the wave head time of the next-nearest measuring device;
f6 distance L from fault point to nearest measuring deviceaDistance L between the fault point and the next nearest measuring devicebAnd the specific position of the fault point in the power distribution network can be determined by the time-space coupling information corresponding to the measuring device and the topological relation of the power distribution network.
As a further solution, the non-selected measuring devices are paired pairwise, fault traveling wave time difference distance measurement calculation is performed to obtain a fault point correction position, and fault traveling wave positioning correction is performed on a specific position through the fault point correction position.
It should be noted that: on the basis of the 10kV power distribution network fault traveling wave space-time coupling matrix, extracting the shortest measurement device information at the moment of the fault traveling wave. As shown in fig. 3, the traveling fault wave generated at the fault point propagates the main line of the 10kV distribution network and the branch line of the device No. 5. As can be seen from the 10kV power distribution network fault traveling wave space-time coupling matrix, the power distribution network measuring devices which receive fault traveling wave signals firstly are No. 5, No. 8 and No. 3 devices. Therefore, the present embodiment calculates the fault location of the 10kV distribution network by using the time information of the three distribution network measurement devices.
The time points of fault traveling waves received by the No. 5, No. 8 and No. 3 power distribution network measuring devices are respectively T5, T8 and T3, the distance length between the No. 5 and No. 8 power distribution network measuring devices is L1, the distance length between the No. 3 and No. 8 power distribution network measuring devices is L2, and the distance length between the No. 3 and No. 5 power distribution network measuring devices is L3, the distance between the devices is compared firstly, and the Lmin with the shortest distance is selected as the basis for double-end traveling wave distance measurement.
And finally, performing pairwise calculation by adopting time difference data of all the 10kV power distribution network measuring devices, and correcting the fault position information of the power distribution network according to the calculated distance.
It should be noted that: pairwise matching of unselected measurement devices to correct the power distribution network fault location information can be performed by an averaging method, a weighting method, a ratio calculation method and the like, and a specific method can be selected according to actual conditions, which is not described in detail in this embodiment.
A power distribution network fault positioning system based on a traveling wave space-time matrix runs on hardware equipment, and positioning of power distribution network fault points is achieved through any one of the power distribution network fault positioning methods based on the traveling wave space-time matrix.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A power distribution network fault positioning method based on a traveling wave space-time matrix is characterized in that a traveling wave signal transmitting device is arranged at the head end of a power distribution network, and at least one measuring device is arranged on each sub-path of the power distribution network and used for detecting traveling wave signals; after the device is installed, the position of a fault point in the power distribution network is positioned through a power distribution network topology identification step, a time-space coupling matrix creation step and a power distribution network fault positioning step;
a power distribution network topology identification step: identifying and verifying the topological relation of the power distribution network topology according to the initial traveling wave signal propagation time difference in the power distribution network; injecting an initial traveling wave signal, establishing an initial traveling wave time difference analysis table, identifying a distribution network topological relation and verifying the distribution network topological relation;
a space-time coupling matrix creating step: extracting the geographical position of the power distribution network through a measuring device, and establishing a space-time coupling matrix by fusing the topological relation of the power distribution network; the method comprises the steps of measuring device clock synchronization, measuring device geographical position extraction, fault traveling wave head time extraction and fault space-time coupling matrix creation;
power distribution network fault positioning: the system is used for positioning the fault through a fault traveling wave signal and a space-time coupling matrix after the power distribution network fails; the method comprises the steps of fault traveling wave time difference analysis, fault traveling wave time difference distance measurement calculation, fault traveling wave positioning correction and power distribution network fault positioning result output.
2. The method for positioning the faults of the power distribution network based on the traveling wave space-time matrix is characterized by comprising the following steps of:
a1, injecting an initial traveling wave signal into the power distribution network through a traveling wave signal transmitting device;
a2 initial traveling wave signal is transmitted to the tail end of the distribution network from the head end of the distribution network;
a3, each measuring device receives the initial traveling wave signal and records the arrival time of the traveling wave head of the initial traveling wave signal to obtain the data time point of the wave head;
a4 forming initial travelling wave time difference analysis table H by each wave head data time pointa：
Ha＝[Y1,Y2-Y1,Y3-Y2,...,Yn-Yn-1]
Wherein n represents the number of the measuring devices, Yn represents the time point of the wave head data obtained by the nth measuring device.
3. The method for positioning the faults of the power distribution network based on the traveling wave space-time matrix is characterized in that the topological relation of the power distribution network is identified through the following steps:
b1 obtaining initial travelling wave time difference analysis table Ha；
B2 obtaining the transmission rate s of the initial travelling wave signal in the power distribution network linea；
B3, calculating the space distance of each line in the power distribution network line and establishing a line space distance matrix Oa：
Oa＝[Y1×sa,(Y2-Y1)×sa,...,(Yn-Yn-1)×sa]
Wherein n represents the number of measuring devices, Yn is the time point of wave head data obtained by the n-th measuring device, saThe transmission rate of the initial traveling wave signal in the power distribution network line is obtained;
b4 matrix of line space distances OaAnd outputting to finish the identification of the topological relation of the power distribution network.
4. The method for positioning the faults of the power distribution network based on the traveling wave space-time matrix is characterized in that the topological relation of the power distribution network is verified through the following steps:
c1 obtaining a line space distance matrix Oa；
C2, injecting a verification traveling wave signal into the power distribution network;
c3, each measuring device receives the verification traveling wave signal and records the arrival time of the traveling wave head of the verification traveling wave signal to obtain the data time point of the verification wave head;
c4 forming a verification travelling wave time difference analysis table through each verification wave head data time point;
c5 establishes a line space distance verification matrix Ob；
C6 contrast line space distance matrix OaVerification matrix O of spatial distance from linebIf the differences are within the error threshold, the topological relation of the power distribution network is considered to be unchanged, and the verification is carried out through the topological relation of the power distribution network; and if the difference exceeds the error threshold value, the topological relation of the power distribution network is considered to be changed, and the topological relation of the power distribution network is updated.
5. The power distribution network fault location method based on the traveling wave space-time matrix is characterized in that a fault analysis master station is deployed at a far end, and a GPS (global positioning system) location module and a communication module are deployed in a measurement device; and each measuring device acquires the position information through a GPS positioning module and establishes communication connection with the fault analysis master station through a communication module.
6. The traveling wave space-time matrix-based power distribution network fault location method according to claim 5, wherein the GPS positioning module is a Beidou positioning module, the Beidou positioning module can be connected with a Beidou time synchronization system and a Beidou positioning system, and the measurement device clock synchronization and the measurement device geographic position extraction are performed through the following steps:
d1 the failure analysis master station sends clock time setting commands to each measuring device through the communication module;
d2 each measuring device sends a clock command to the Beidou time synchronization system;
d3 the Beidou time synchronization system issues standard time to each measuring device;
d4, each measuring device sets the issuing standard time as an internal clock, returns to the fault analysis master station and completes the clock synchronization of the measuring devices;
d5 the failure analysis master station sends a geographic position extraction command to each measuring device through a communication module;
d6, each measuring device requests the Beidou positioning system to issue a geographic position instruction;
d7 the Beidou positioning system sends geographic position information to each measuring device;
d8, each measuring device receives the geographical position information, and stamps a time stamp through standard time to obtain space-time coupling information;
and D9 the fault analysis master station receives the space-time coupling information of each measuring device to finish the extraction of the geographical position of the measuring device.
7. The method for positioning the faults of the power distribution network based on the traveling wave space-time matrix is characterized by comprising the following steps of:
e1, each measuring device continuously detects fault traveling wave signals in the power distribution network, records detected space-time coupling information and uploads the detected space-time coupling information to a fault analysis main station, wherein the timestamp corresponds to the wave head time of the fault traveling wave signals;
e2 when a fault occurs in the power distribution network, the fault analysis master station calls the space-time coupling information of each measuring device in the fault occurrence period;
e3 sequencing the space-time coupling information according to the serial number of the measuring device to obtain a fault space-time coupling matrix Ka：
Wherein n represents the number of measuring devices; tn represents the wave head time of the wave head of the fault traveling wave signal detected by the nth measuring device; an represents the geographical position information of the wave head of the fault traveling wave signal detected by the nth measuring device.
8. The power distribution network fault location method based on the traveling wave space-time matrix as claimed in claim 1, wherein the fault traveling wave time difference analysis and the fault traveling wave time difference ranging calculation are performed by the following steps:
f1, selecting a measuring device for detecting fault traveling wave signals of each sub-path of the power distribution network firstly;
f2, identifying the topological relation of the distribution network, and calculating the line space distance between every two selected measuring devices;
f3 obtains the shortest value of the line space distance between two and uses it as the reference distance Lmin of the double-end traveling wave ranging, that is:
wherein n isbThe line spacing between every two selected measuring devices is obtained;
f4 obtaining wave head time T of detected fault traveling wave signal wave head corresponding to reference distance Lmin measuring deviceaAnd TbWherein, TaRepresents the wave head time, T, of the nearest measurement devicebRepresenting the wave head time of the next-nearest measuring device;
f5 calculating distance L between fault point and nearest measuring device by double-end traveling wave distance measurementaDistance L from fault point to next-nearest measuring deviceb：
Wherein S isbRepresenting the propagation rate of the fault traveling wave signal in the power distribution network; lmin denotes the reference distance; t isaRepresents the wave head time, T, of the nearest measurement devicebRepresenting the wave head time of the next-nearest measuring device;
f6 distance L from fault point to nearest measuring deviceaPoint of failure to next nearestDistance L of measuring devicebAnd the specific position of the fault point in the power distribution network can be determined by the time-space coupling information corresponding to the measuring device and the topological relation of the power distribution network.
9. The method as claimed in claim 8, wherein the fault location of the distribution network is performed by pairing the unselected measurement devices, performing the fault traveling wave time difference ranging calculation to obtain a fault point correction location, and performing the fault traveling wave location correction on the specific location through the fault point correction location.
10. A power distribution network fault location system based on a traveling wave space-time matrix, which is operated on hardware equipment and realizes the location of a power distribution network fault point through the power distribution network fault location method based on the traveling wave space-time matrix according to any one of claims 1 to 9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116125196A (en) * | 2022-12-02 | 2023-05-16 | 南京大贺电力科技有限公司 | High-voltage cable fault traveling wave ranging system and method |
| CN117454315A (en) * | 2023-12-21 | 2024-01-26 | 国网浙江省电力有限公司宁波供电公司 | Man-machine terminal picture data interaction method and system |
| CN117572157A (en) * | 2024-01-15 | 2024-02-20 | 湖南湘能智能电器股份有限公司 | Distribution network line abnormal traveling wave positioning method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116125196A (en) * | 2022-12-02 | 2023-05-16 | 南京大贺电力科技有限公司 | High-voltage cable fault traveling wave ranging system and method |
| CN117454315A (en) * | 2023-12-21 | 2024-01-26 | 国网浙江省电力有限公司宁波供电公司 | Man-machine terminal picture data interaction method and system |
| CN117572157A (en) * | 2024-01-15 | 2024-02-20 | 湖南湘能智能电器股份有限公司 | Distribution network line abnormal traveling wave positioning method and system |
| CN117572157B (en) * | 2024-01-15 | 2024-04-12 | 湖南湘能智能电器股份有限公司 | Distribution network line abnormal traveling wave positioning method and system |
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