CN114675134B - 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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- 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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- 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
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- 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
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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 signals are injected into the power distribution network, and the initial traveling wave signals are checked by utilizing the measuring devices on all sub-paths of the power distribution network, so that the identification and verification of the topological relation of the power distribution network are realized; on the basis, geographic position extraction is carried out on the power distribution network through a measuring device, and a space-time coupling matrix is built by fusing topological relations of the power distribution network; thereby realizing the acquisition of space-time coupling information; then, determining the specific position of the fault point in the power distribution network through fault traveling wave time difference analysis and fault traveling wave time difference ranging calculation; finally, correcting the fault position information of the power distribution network through fault traveling wave time difference data of other measuring devices, and completing the positioning of fault points; compared with the prior art, the method comprises the following steps: the method can be used for remotely and quickly positioning the fault points of the power distribution network, and has good practical value in a large-scale power distribution network scene.
Description
Technical Field
The invention relates to the technical field of digital power, in particular to a power distribution network fault positioning method and system based on a traveling wave space-time matrix.
Background
Along with the rapid development of Chinese economy, the power demand is continuously increased, and the power distribution network is increasingly expanded in scale. The Chinese 10kV power distribution network has wide geographical distribution, and part of the 10kV power distribution network has the line length exceeding 100 km, and the power distribution network is long in routing inspection and fault finding. The Chinese 10kV power distribution network adopts neutral points to operate without grounding or through arc suppression coils, after single-phase grounding faults of the 10kV power distribution network are caused by lightning trees and mountain fires, the 10kV power distribution network does not form a short circuit, line voltages are still symmetrical, and the 10kV power distribution network can operate with faults. However, after the 10kV power distribution network is in single-phase grounding, the voltage of a non-fault phase is increased, and potential safety hazards are brought to the power distribution network. Therefore, after a 10kV power distribution network fails, the failure position needs to be positioned as soon as possible so as to be convenient for a power supply company to handle.
Many scholars at home and abroad have made a great deal of researches on the fault location of the 10kV distribution network, and mainly divide the two types of section location and accurate location. The regional positioning method adopts a transient zero-sequence current wide-area comparison method to position, and after the 10kV power distribution network fails, the transient zero-sequence current of the failure point is checked through a failure indicator, so that the section where the 10kV power distribution network fails is judged. In the literature, a 10kV power distribution network fault positioning method based on transient zero-sequence current characteristics is provided, and the concave-convex characteristics of the power distribution line fault point zero-sequence current transient waveform are detected through a fault indicator, so that the section of the 10kV power distribution network fault is judged. In the existing literature, the cable fault detection of the 10kV power distribution network is carried out through transient zero-sequence current, so that the fault section of the 10kV power distribution network is judged. However, if a fault indicator is installed in the 10kV distribution line for about 5 km, after a single-phase earth fault of the 10kV distribution line occurs, the fault is required to be checked within the range of 5 km, and the time consumption is long.
The accurate positioning method adopts a fault traveling wave method to perform power grid fault positioning. In the prior art, a single-ended traveling wave method is adopted to locate the power grid faults, and the method locates the power grid faults on the attenuation characteristics of the wave heads of the fault traveling wave and the reflected wave and the time length reaching the measuring device, wherein the locating precision is 120 meters. In the prior art, a double-end traveling wave method is adopted to locate the power grid fault, and the time difference that the fault traveling wave reaches the measuring devices at two ends of the fault is determined by determining the maximum value of the power grid fault traveling wave wavelet. However, the above-mentioned research is mainly applied to the transmission line with simple grid structure, and the 10kV distribution line branch T contacts are many, and the wave form reaches the reflected wave of measuring device more, and measuring error is great.
Therefore, it is necessary to provide a method and a system for locating faults of a power distribution network 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 technical problems, the invention provides a power distribution network fault positioning 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 device is 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 topology identification step of the power distribution network comprises the following steps: carrying out topology relation identification and verification on the power distribution network topology according to the propagation time difference of the initial traveling wave signals in the power distribution network; the method comprises the steps of initial traveling wave signal injection, initial traveling wave time difference analysis table establishment, distribution network topology relation identification and distribution network topology relation verification.
Specifically, the space-time coupling matrix creation 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 fault positioning step of the power distribution network comprises the following steps: the fault traveling wave signal and the space-time coupling matrix are used for positioning the fault after the power distribution network fails; the method comprises 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 a power distribution network through a traveling wave signal transmitting device;
a2, the initial traveling wave signal delays a power distribution network line and is sent to the tail end of the power distribution network from the head end of the power 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
A wave head data time point;
A4, forming an initial traveling wave time difference analysis table H a through each wave head data time point:
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 n-th measuring device.
As a further solution, the topology of the distribution network is identified by the following steps:
b1, acquiring an initial traveling wave time difference analysis table H a;
B2, acquiring the transmission rate s a of the initial traveling wave signal in a power distribution network line;
b3, calculating the space distance of each line in the power distribution network line, and establishing a line space distance matrix O a:
Oa＝[Y1×sa,(Y2-Y1)×sa,...,(Yn-Yn-1)×sa]
Wherein n represents the number of measuring devices, and s a is the transmission rate of the initial traveling wave signal in the power distribution network line at the time point of the wave head data obtained by the Yn n measuring device;
and B4, outputting a line space distance matrix O a to finish the identification of the topological relation of the power distribution network.
As a further solution, the topology of the distribution network is verified by:
C1 obtains a line space distance matrix O a;
c2, injecting verification traveling wave signals into the power distribution network;
each measuring device receives the verification traveling wave signal, records the arrival time of a traveling wave head of the verification traveling wave signal, and obtains a data time point of the verification wave head;
C4, forming a verification traveling wave time difference analysis table through each verification wave head data time point;
C5 establishes a line space distance verification matrix O b;
C6 compares the differences of the sub-items of the line space distance matrix O a and the line space distance verification matrix O b, if the differences are within the error threshold value, the topology relationship of the power distribution network is considered to be unchanged, and the topology relationship verification of the power distribution network is passed; and if the difference exceeding the error threshold exists, the topology relation of the power distribution network is considered to be changed, and the topology relation of the power distribution network is updated.
As a further solution, a fault analysis master station is deployed at the far end, and a GPS positioning module and a communication module are deployed in the measuring device; each measuring device obtains 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 Beidou positioning module, and the Beidou positioning module can be connected with a Beidou time setting system and a Beidou positioning system and is used for carrying out clock synchronization of the measuring device and geographic position extraction of the measuring device through the following steps:
d1, the fault analysis master station sends a clock time setting command to each measuring device through the communication module;
Each measuring device requests to issue a clock instruction to the Beidou time synchronization system;
d3, the Beidou time setting system transmits standard time to each measuring device;
setting the standard issuing time as an internal clock by each measuring device, returning to the fault analysis master station, and synchronizing clocks of the measuring devices;
d5, the fault analysis master station sends a geographic position extraction command to each measuring device through the communication module;
d6, each measuring device requests to issue a geographic position instruction to the Beidou positioning system;
d7, the Beidou positioning system transmits geographic position information to each measuring device;
d8, each measuring device receives the geographical position information, and marks 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 and completes the geographical position extraction of the measuring device.
As a further solution, fault traveling wave head time extraction and fault spatio-temporal coupling matrix creation are performed by:
Each measuring device continuously detects fault traveling wave signals in the power distribution network, records the detected space-time coupling information and uploads the space-time coupling information to a fault analysis master station, wherein a time stamp corresponds to the wave head time of the fault traveling wave signals;
When a fault occurs in the power distribution network, the fault analysis master station invokes space-time coupling information of each measuring device in the fault occurrence period;
And E3, sequencing the space-time coupling information according to the number of the measuring device to obtain a fault space-time coupling matrix K a:
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 n-th measuring device; an represents the geographical position information of the wave head of the fault traveling wave signal detected by the n-th measuring device.
As a further solution, the fault traveling wave time difference analysis and the fault traveling wave time difference ranging calculation are performed by:
f1, selecting a measuring device for detecting fault traveling wave signals at first in each sub-path of the power distribution network;
f2, identifying through the topological relation of the power distribution network, and calculating the line space distance between every two selected measuring devices;
F3, obtaining the shortest value of the line space distance between every two pairs, and taking the shortest value as the reference distance Lmin of double-end traveling wave ranging, namely:
wherein n b is the line space between every two selected measuring devices;
F4, acquiring the wave head time T a and T b of the wave head of the detected fault traveling wave signal corresponding to the reference distance Lmin measuring device, wherein T a represents the wave head time of the nearest measuring device, and T b represents the wave head time of the next nearest measuring device;
F5 calculating the fault point-to-nearest measuring device distance L a and the fault point-to-next-nearest measuring device distance L b by double-end traveling wave ranging:
wherein S b represents the rate at which the fault traveling wave signal propagates in the power distribution network; lmin represents a reference distance; t a represents the time of the head of the nearest measuring device, T b represents the time of the head of the next nearest measuring device;
F6 can determine the specific position of the fault point in the power distribution network through the distance L a from the fault point to the nearest measuring device, the distance L b from the fault point to the next nearest measuring device, the space-time coupling information corresponding to the measuring device and the topological relation of the power distribution network.
As a further solution, the fault traveling wave time difference ranging calculation is executed by pairing the unselected measuring devices in pairs to obtain a fault point correction position, and fault traveling wave positioning correction is carried out on the specific position through the fault point correction position.
The power distribution network fault positioning system based on the traveling wave space-time matrix operates on hardware equipment, and the power distribution network fault point is positioned by the power distribution network fault positioning method based on the traveling wave space-time matrix.
Compared with the related art, 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 signals are injected into the power distribution network, and the initial traveling wave signals are checked by utilizing the measuring devices on all sub-paths of the power distribution network, 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 fault point positioning, and the verification of the topological relation of the power distribution network can ensure the positioning accuracy;
2. According to the invention, the geographical position of the power distribution network is extracted through the measuring device, and the space-time coupling matrix is built by fusing the topological relation of the power distribution network, so that the acquisition of space-time coupling information is realized; and used in subsequent positioning;
3. According to the method, the specific position of the fault point in the power distribution network is determined through fault traveling wave time difference analysis and fault traveling wave time difference ranging calculation; finally, correcting the fault position information of the power distribution network through fault traveling wave time difference data of other measuring devices, and completing the positioning of fault points; compared with the prior art, the method comprises the following steps: the fault point of the power distribution network can be remotely and unmanned to quickly position, and the method has good practical value in a large-scale power distribution network scene; the fault locating time is shortened without manual investigation one by one, so that the normal operation of the whole power distribution network is ensured.
Drawings
FIG. 1 is a flowchart 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 according to a preferred embodiment of a 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 according to a preferred embodiment of the present invention.
Detailed Description
Various exemplary embodiments, features and aspects of the disclosure will be described in detail below with reference to the drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Although various aspects of the embodiments are illustrated in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The word "exemplary" is used 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.
In addition, numerous specific details are set forth in the following detailed description 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 well known to those skilled in the art have not been described in detail in order not to obscure the present disclosure.
As shown in fig. 1 to 3, according to the power distribution network fault positioning method based on the traveling wave space-time matrix, 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 space-time coupling matrix creation step and a power distribution network fault positioning step.
Specifically, the topology identification step of the power distribution network comprises the following steps: carrying out topology relation identification and verification on the power distribution network topology according to the propagation time difference of the initial traveling wave signals in the power distribution network; the method comprises the steps of initial traveling wave signal injection, initial traveling wave time difference analysis table establishment, distribution network topology relation identification and distribution network topology relation verification.
Specifically, the space-time coupling matrix creation 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 fault positioning step of the power distribution network comprises the following steps: the fault traveling wave signal and the space-time coupling matrix are used for positioning the fault after the power distribution network fails; the method comprises 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 power distribution network in China operates in a multi-section multi-connection mode, as shown in fig. 2, the embodiment takes a 10kV power distribution network line as an example, and the 10kV power distribution network comprises 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 a power distribution network through a traveling wave signal transmitting device;
a2, the initial traveling wave signal delays a power distribution network line and is sent to the tail end of the power distribution network from the head end of the power 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
A wave head data time point;
A4, forming an initial traveling wave time difference analysis table H a through each wave head data time point:
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 n-th 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 No. 0 to No. 12 distribution line measuring devices are installed. Firstly, a traveling wave signal transmitting device at the head end of a No.1 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 time point of the wave head receiving the initial traveling wave signal is recorded to form an initial traveling wave time difference analysis table.
As a further solution, the topology of the distribution network is identified by the following steps:
b1, acquiring an initial traveling wave time difference analysis table H a;
B2, acquiring the transmission rate s a of the initial traveling wave signal in a power distribution network line;
b3, calculating the space distance of each line in the power distribution network line, and establishing a line space distance matrix O a:
Oa＝[Y1×sa,(Y2-Y1)×sa,...,(Yn-Yn-1)×sa]
Wherein n represents the number of measuring devices, and s a is the transmission rate of the initial traveling wave signal in the power distribution network line at the time point of the wave head data obtained by the Yn n measuring device;
and B4, outputting a line space distance matrix O a to finish the identification of the topological relation of the power distribution network.
As a further solution, the topology of the distribution network is verified by:
C1 obtains a line space distance matrix O a;
c2, injecting verification traveling wave signals into the power distribution network;
each measuring device receives the verification traveling wave signal, records the arrival time of a traveling wave head of the verification traveling wave signal, and obtains a data time point of the verification wave head;
C4, forming a verification traveling wave time difference analysis table through each verification wave head data time point;
C5 establishes a line space distance verification matrix O b;
C6 compares the differences of the sub-items of the line space distance matrix O a and the line space distance verification matrix O b, if the differences are within the error threshold value, the topology relationship of the power distribution network is considered to be unchanged, and the topology relationship verification of the power distribution network is passed; and if the difference exceeding the error threshold exists, the topology relation of the power distribution network is considered to be changed, and the topology relation of the power distribution network is updated.
It should be noted that: because the 10kV power distribution network has complex running condition and the topology relationship of the power distribution network is easy to change, if the original topology relationship of the power distribution network is still adopted for positioning when the topology relationship of the power distribution network changes, the final positioning result can be influenced, and therefore the embodiment also needs to verify the topology relationship of the power distribution network before positioning the fault point so as to keep the topology relationship of the power distribution network updated in real time.
As a further solution, a fault analysis master station is deployed at the far end, and a GPS positioning module and a communication module are deployed in the measuring device; each measuring device obtains 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 Beidou positioning module, and the Beidou positioning module can be connected with a Beidou time setting system and a Beidou positioning system and is used for carrying out clock synchronization of the measuring device and geographic position extraction of the measuring device through the following steps:
d1, the fault analysis master station sends a clock time setting command to each measuring device through the communication module;
Each measuring device requests to issue a clock instruction to the Beidou time synchronization system;
d3, the Beidou time setting system transmits standard time to each measuring device;
setting the standard issuing time as an internal clock by each measuring device, returning to the fault analysis master station, and synchronizing clocks of the measuring devices;
d5, the fault analysis master station sends a geographic position extraction command to each measuring device through the communication module;
d6, each measuring device requests to issue a geographic position instruction to the Beidou positioning system;
d7, the Beidou positioning system transmits geographic position information to each measuring device;
d8, each measuring device receives the geographical position information, and marks 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 and completes the geographical position extraction of the measuring device.
It should be noted that: the measuring device provided in the embodiment realizes clock synchronization of the measuring device of the No. 0-12 10kV power distribution network through the Beidou technology. Firstly, a power distribution network traveling wave fault analysis master station sends a clock timing command to the measuring devices from No. 0 to No. 12, and each measuring device requests a Beidou timing system to send a clock command. Finally, the Beidou time setting system respectively transmits standard time to the power distribution network measuring devices from 0 to 12. And then, acquiring the installation information of the distribution network measuring device through the 10kV distribution network installation rod number of the distribution network measuring device. And secondly, the power distribution network measuring device requests coordinate position information from the Beidou position system and reports the obtained coordinate position information to a power distribution network traveling wave fault analysis master station.
As a further solution, fault traveling wave head time extraction and fault spatio-temporal coupling matrix creation are performed by:
Each measuring device continuously detects fault traveling wave signals in the power distribution network, records the detected space-time coupling information and uploads the space-time coupling information to a fault analysis master station, wherein a time stamp corresponds to the wave head time of the fault traveling wave signals;
When a fault occurs in the power distribution network, the fault analysis master station invokes space-time coupling information of each measuring device in the fault occurrence period;
And E3, sequencing the space-time coupling information according to the number of the measuring device to obtain a fault space-time coupling matrix K a:
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 n-th measuring device; an represents the geographical position information of the wave head of the fault traveling wave signal detected by the n-th measuring device.
It should be noted that: as shown in fig. 3, after a 10kV power distribution network fails, the generated fault traveling wave diverges from the fault point to two ends, and the longer the propagation distance is, the longer the time consumption is, and the greater the attenuation is. When any one of the power distribution network measuring devices monitors a 10kV power distribution network fault, all the measuring devices in the power distribution network are cooperatively controlled to start, the 0-12 power distribution network measuring devices all receive the wave head time point of the fault traveling wave, the wave head time point is built, the geographical coordinate information of the power distribution network measuring devices and the number information of the hung power distribution line are built, and a space-time coupling matrix is built.
As a further solution, the fault traveling wave time difference analysis and the fault traveling wave time difference ranging calculation are performed by:
f1, selecting a measuring device for detecting fault traveling wave signals at first in each sub-path of the power distribution network;
f2, identifying through the topological relation of the power distribution network, and calculating the line space distance between every two selected measuring devices;
F3, obtaining the shortest value of the line space distance between every two pairs, and taking the shortest value as the reference distance Lmin of double-end traveling wave ranging, namely:
wherein n b is the line space between every two selected measuring devices;
F4, acquiring the wave head time T a and T b of the wave head of the detected fault traveling wave signal corresponding to the reference distance Lmin measuring device, wherein T a represents the wave head time of the nearest measuring device, and T b represents the wave head time of the next nearest measuring device;
F5 calculating the fault point-to-nearest measuring device distance L a and the fault point-to-next-nearest measuring device distance L b by double-end traveling wave ranging:
wherein S b represents the rate at which the fault traveling wave signal propagates in the power distribution network; lmin represents a reference distance; t a represents the time of the head of the nearest measuring device, T b represents the time of the head of the next nearest measuring device;
F6 can determine the specific position of the fault point in the power distribution network through the distance L a from the fault point to the nearest measuring device, the distance L b from the fault point to the next nearest measuring device, the space-time coupling information corresponding to the measuring device and the topological relation of the power distribution network.
As a further solution, the fault traveling wave time difference ranging calculation is executed by pairing the unselected measuring devices in pairs to obtain a fault point correction position, and fault traveling wave positioning correction is carried out on the specific position through the fault point correction position.
It should be noted that: and extracting the information of the measuring device with the shortest fault traveling wave moment on the basis of the 10kV power distribution network fault traveling wave space-time coupling matrix. As shown in fig. 3, the fault traveling wave generated by the fault point propagates the main line of the 10kV distribution network and the branch line of the No. 5 device. As can be seen from the 10kV power distribution network fault traveling wave space-time coupling matrix, power distribution network measuring devices which firstly receive fault traveling wave signals are No. 5, no. 8 and No. 3 devices. Therefore, the embodiment calculates the fault position of the 10kV power distribution network by adopting the time information of the three power distribution network measuring devices.
And if the fault traveling wave time points received by the power distribution network measuring devices No. 5, no. 8 and No. 3 are T5, T8 and T3 respectively, the distance length of the power distribution network measuring devices No. 5 and No. 8 is L1, the distance length of the power distribution network measuring devices No. 3 and No. 8 is L2, and the distance length of the power distribution network measuring devices No. 3 and No. 5 is L3, the distances among the devices are compared firstly, and the distance Lmin with the shortest distance is selected as the basis of double-end traveling wave distance measurement.
And finally, carrying out pairwise calculation by adopting time difference data of all 10kV power distribution network measuring devices, and correcting the power distribution network fault position information according to the calculated distance.
It should be noted that: the fault location information of the distribution network can be corrected by pairing the unselected measuring devices in pairs by means of a mean value method, a weight method, a ratio calculation method and the like, and the specific method can be selected according to actual conditions, so that details of the embodiment are omitted.
A power distribution network fault positioning system based on a traveling wave space-time matrix operates on hardware equipment, and the power distribution network fault point is positioned by the power distribution network fault positioning method based on the traveling wave space-time matrix.
The foregoing is only illustrative of the present invention and is not to be construed as limiting the scope of the invention, and all equivalent structures or equivalent flow modifications which may be made by the teachings of the present invention and the accompanying drawings or which may be directly or indirectly employed in other related art are within the scope of the invention.
Claims (6)
1. The power distribution network fault positioning method based on the traveling wave space-time matrix is characterized in that 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 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;
The topology identification step of the power distribution network comprises the following steps: carrying out topology relation identification and verification on the power distribution network topology according to the propagation time difference of the initial traveling wave signals in the power distribution network; the method comprises the steps of initial traveling wave signal injection, initial traveling wave time difference analysis table establishment, distribution network topology relation identification and distribution network topology relation verification;
A space-time coupling matrix creation 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;
And (3) fault positioning of the power distribution network: the fault traveling wave signal and the space-time coupling matrix are used for positioning the fault after the power distribution network fails; the method comprises 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;
the topology relation of the power distribution network is verified through the following steps:
C1 obtains a line space distance matrix O a;
c2, injecting verification traveling wave signals into the power distribution network;
each measuring device receives the verification traveling wave signal, records the arrival time of a traveling wave head of the verification traveling wave signal, and obtains a data time point of the verification wave head;
C4, forming a verification traveling wave time difference analysis table through each verification wave head data time point;
C5 establishes a line space distance verification matrix O b;
C6 compares the differences of the sub-items of the line space distance matrix O a and the line space distance verification matrix O b, if the differences are within the error threshold value, the topology relationship of the power distribution network is considered to be unchanged, and the topology relationship verification of the power distribution network is passed; if the difference exceeding the error threshold exists, the topology relation of the power distribution network is considered to change, and the topology relation of the power distribution network is updated;
A fault analysis master station is arranged at the far end, and a GPS positioning module and a communication module are arranged in the measuring device; each measuring device acquires position information through a GPS positioning module and establishes communication connection with a fault analysis master station through a communication module;
the GPS positioning module is a Beidou positioning module, the Beidou positioning module can be connected with a Beidou time setting system and a Beidou positioning system, and the clock synchronization of the measuring device and the geographical position extraction of the measuring device are carried out through the following steps:
d1, the fault analysis master station sends a clock time setting command to each measuring device through the communication module;
Each measuring device requests to issue a clock instruction to the Beidou time synchronization system;
d3, the Beidou time setting system transmits standard time to each measuring device;
setting the standard issuing time as an internal clock by each measuring device, returning to the fault analysis master station, and synchronizing clocks of the measuring devices;
d5, the fault analysis master station sends a geographic position extraction command to each measuring device through the communication module;
d6, each measuring device requests to issue a geographic position instruction to the Beidou positioning system;
d7, the Beidou positioning system transmits geographic position information to each measuring device;
d8, each measuring device receives the geographical position information, and marks a time stamp through standard time to obtain space-time coupling information;
D9, the fault analysis master station receives the space-time coupling information of each measuring device and completes the geographic position extraction of the measuring device;
The fault traveling wave head time extraction and the fault space-time coupling matrix creation are carried out by the following steps:
Each measuring device continuously detects fault traveling wave signals in the power distribution network, records the detected space-time coupling information and uploads the space-time coupling information to a fault analysis master station, wherein a time stamp corresponds to the wave head time of the fault traveling wave signals;
When a fault occurs in the power distribution network, the fault analysis master station invokes space-time coupling information of each measuring device in the fault occurrence period;
And E3, sequencing the space-time coupling information according to the number of the measuring device to obtain a fault space-time coupling matrix K a:
Wherein n represents the number of measuring devices; tn represents the wave head time of the n-th measuring device for detecting the fault traveling wave signal; an represents the geographical position information of the wave head of the fault traveling wave signal detected by the n-th measuring device.
2. The power distribution network fault location method based on traveling wave space-time matrix according to claim 1, wherein the steps of initial traveling wave signal injection and initial traveling wave time difference analysis table establishment are performed by:
A1, injecting an initial traveling wave signal into a power distribution network through a traveling wave signal transmitting device;
a2, the initial traveling wave signal is transmitted to the tail end of the power distribution network along the power distribution network line from the head end of the power distribution network;
A3, each measuring device receives the initial traveling wave signal, records the arrival time of a traveling wave head of the initial traveling wave signal, and obtains a wave head data time point;
A4, forming an initial traveling wave time difference analysis table H a through each wave head data time point:
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 n-th measuring device.
3. A power distribution network fault location method based on traveling wave space-time matrix according to claim 2, wherein,
The topology relation of the power distribution network is identified through the following steps:
b1, acquiring an initial traveling wave time difference analysis table H a;
B2, acquiring the transmission rate s a of the initial traveling wave signal in a power distribution network line;
b3, calculating the space distance of each line in the power distribution network line, and establishing a line space distance matrix O a:
Oa＝[Y1×sa,(Y2-Y1)×sa,...,(Yn-Yn-1)×sa]
wherein n represents the number of measuring devices, yn represents the time point of the wave head data obtained by the n-th measuring device, and s a is the transmission rate of the initial traveling wave signal in the power distribution network line;
and B4, outputting a line space distance matrix O a to finish the identification of the topological relation of the power distribution network.
4. The power distribution network fault location method based on traveling wave space-time matrix according to 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 at first in each sub-path of the power distribution network;
f2, identifying through the topological relation of the power distribution network, and calculating the line space distance between every two selected measuring devices;
F3, obtaining the shortest value of the line space distance between every two pairs, and taking the shortest value as the reference distance Lmin of double-end traveling wave ranging, namely:
wherein Lnb is the line space distance between every two selected measuring devices;
F4, obtaining a reference distance Lmin, and measuring the corresponding time T a and T b of the wave head of the fault traveling wave signal detected by the device, wherein T a represents the time of the wave head of the nearest measuring device, and T b represents the time of the wave head of the next nearest measuring device;
F5 calculating the fault point-to-nearest measuring device distance L a and the fault point-to-next-nearest measuring device distance L b by double-end traveling wave ranging:
wherein S b represents the rate at which the fault traveling wave signal propagates in the power distribution network; lmin represents a reference distance; t a represents the time of the head of the nearest measuring device, T b represents the time of the head of the next nearest measuring device;
F6 can determine the specific position of the fault point in the power distribution network through the distance L a from the fault point to the nearest measuring device, the distance L b from the fault point to the next nearest measuring device, the space-time coupling information corresponding to the measuring device and the topological relation of the power distribution network.
5. The fault location method of a power distribution network based on a traveling wave space-time matrix according to claim 4, further comprising performing fault traveling wave time difference ranging calculation by pairing unselected measuring devices in pairs to obtain a fault point correction position, and performing fault traveling wave location correction on a specific position through the fault point correction position.
6. A power distribution network fault location system based on a traveling wave space-time matrix, which is operated on hardware equipment and is used for locating power distribution network fault points by a power distribution network fault location method based on a traveling wave space-time matrix as claimed in any one of claims 1 to 5.
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