CN111610408A - Traveling wave fault positioning method, device, equipment and storage medium - Google Patents
Traveling wave fault positioning method, device, equipment and storage medium Download PDFInfo
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- 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
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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
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Abstract
The invention discloses a method, a device, equipment and a storage medium for locating a traveling wave fault. The method comprises the following steps: acquiring detection data sent by each traveling wave detection device; determining a target traveling wave detection device and an abnormal traveling wave detection device according to detection data sent by each traveling wave detection device; when the abnormal traveling wave detection device is determined, determining a target distance according to detection data sent by the target traveling wave detection device and a pre-stored topological structure of the power distribution network; the detection data sent by the target traveling wave detection device comprises the initial time of the line fault and the target time of the initial traveling wave head reaching the target traveling wave detection device; and determining the position of the line fault point according to the target distance, the target time, the initial time and a ranging algorithm. The invention can eliminate abnormal traveling wave detection devices, can screen out effective data, avoids the problem that a fault point cannot be determined due to the fault of a certain traveling wave detection device, and improves the reliability of positioning the fault point.
Description
Technical Field
The embodiment of the invention relates to the technical field of fault detection, in particular to a traveling wave fault positioning method, a traveling wave fault positioning device, traveling wave fault positioning equipment and a storage medium.
Background
With the development of automation technology, it is increasingly important that the distribution network operates automatically. The automation of the power distribution network is to monitor and manage the power distribution network by using various technologies and power distribution equipment, so that the power distribution network is in a safe and reliable running state. Among them, fault location is one of the key technologies for power distribution network automation.
In the related art, a plurality of traveling wave detection devices connected to a monitoring device are generally arranged in a power distribution network, and the monitoring device is configured to receive detection data sent by each traveling wave detection device, and determine a fault point position between two adjacent traveling wave detection devices according to the detection data of the two adjacent traveling wave detection devices.
However, in the above-mentioned technology, the monitoring device can only determine the position of the fault point between two adjacent traveling wave detection devices according to the detection data of the two adjacent traveling wave detection devices, and if a certain traveling wave detection device of the two adjacent traveling wave detection devices fails, the position of the fault point between the two adjacent traveling wave detection devices cannot be determined, thereby reducing the reliability of the monitoring device in locating the position of the fault point.
Disclosure of Invention
The invention provides a traveling wave fault positioning method, a traveling wave fault positioning device, traveling wave fault positioning equipment and a traveling wave fault positioning storage medium, which aim to solve the problem of low reliability of positioning a fault point in the prior art.
In a first aspect, an embodiment of the present invention provides a traveling wave fault location method, including:
acquiring detection data sent by each traveling wave detection device;
determining a target traveling wave detection device and an abnormal traveling wave detection device according to the detection data sent by each traveling wave detection device;
when the abnormal traveling wave detection device is determined, determining a target distance according to detection data sent by the target traveling wave detection device and a pre-stored power distribution network topological structure; the detection data sent by the target traveling wave detection device comprises the initial time of the fault of the distribution line and the target time of the initial traveling wave head in the fault traveling wave signal reaching the target traveling wave detection device;
and determining the position of the line fault point according to the target distance, the target time, the initial time and a ranging algorithm.
In a second aspect, an embodiment of the present invention further provides a traveling wave fault locating apparatus, where the apparatus includes:
the acquisition module is used for acquiring detection data sent by each traveling wave detection device;
the first determining module is used for determining a target traveling wave detection device and an abnormal traveling wave detection device according to the detection data sent by each traveling wave detection device;
the second determining module is used for determining a target distance according to detection data sent by the target traveling wave detection device and a pre-stored topological structure of the power distribution network when the abnormal traveling wave detection device is determined; the detection data sent by the target traveling wave detection device comprises the initial time of the fault of the distribution line and the target time of the initial traveling wave head in the fault traveling wave signal reaching the target traveling wave detection device;
and the third determining module is used for determining the position of the line fault point according to the target distance, the target time, the initial time and a distance measuring algorithm.
In a third aspect, an embodiment of the present invention further provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the computer program to implement the traveling wave fault location method according to any embodiment of the present invention.
In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the traveling wave fault location method according to any embodiment of the present invention.
The invention provides a traveling wave fault positioning method, a traveling wave fault positioning device, traveling wave fault positioning equipment and a storage medium. Therefore, abnormal traveling wave detection devices can be eliminated, the positions of line fault points are determined by combining the detection data of the target traveling wave detection device with the pre-stored power distribution network topological structure, effective data can be screened out, the problem that the fault points cannot be determined due to faults of a certain traveling wave detection device is solved, and the reliability of locating the positions of the fault points is improved.
Drawings
Fig. 1 is a flowchart of a traveling wave fault locating method according to a first embodiment of the present invention;
fig. 2 is a schematic block circuit diagram of a traveling wave detection apparatus according to a first embodiment of the present invention;
fig. 3a is a flowchart of a traveling wave fault location method in the second embodiment of the present invention;
fig. 3b is a schematic diagram of a power distribution network topology according to a second embodiment of the present invention;
fig. 3c is a schematic diagram of a power distribution network topology according to the second embodiment of the present invention;
fig. 4 is a structural diagram of a traveling wave fault location device in the third embodiment of the present invention;
fig. 5 is a schematic structural diagram of an apparatus according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 1 is a flowchart of a traveling wave fault location method according to an embodiment of the present invention, where the present embodiment is applicable to a scenario where a fault point in a power distribution network is located, and the method may be executed by a traveling wave fault location device, where the device may be a background master station system, where the background master station system includes an ethernet switch, a server, and a display, where each traveling wave detection device is connected to the server through the ethernet switch, and the display is also connected to the server, and the ethernet switch is used to ensure conflict-free information transmission between each traveling wave detection device and the server; the display is used for displaying the detection data received by the server and the finally determined position information of the line fault point, and is used for accessing the server in real time through a webpage, an application program and the like, looking up historical information and generating data related to the line fault, and the traveling wave fault positioning method specifically comprises the following steps:
Illustratively, a plurality of traveling wave detection devices are arranged on the distribution line according to a preset distance, as shown in fig. 2, each traveling wave detection device includes a current acquisition module 201, a voltage acquisition module 202, an analog-to-digital conversion module 203, a first storage module 204, a second storage module 205, an FPGA (Field-Programmable Gate Array) module 206, a microprocessor 207, a wireless communication module 208, a clock module 209, and a GPS (Global Positioning System) receiver 210, the current acquisition module 201 and the voltage acquisition module 202 are respectively connected with the FPGA module 206 through the analog-to-digital conversion module 203, the first storage module 204 is connected with the FPGA module 206, an input end of the clock module 209 is connected with an output end of the GPS receiver 210, an output end of the clock module 209 is connected with the FPGA module 206, an output end of the GPS receiver 210 is also connected with the microprocessor 207, the FPGA module 206 is connected with the output end of the clock module 209, The second storage module 205 and the wireless communication module 208 are both connected to the microprocessor 207.
The current acquisition module 201 is used for detecting current signals of the power distribution line, the voltage acquisition module 202 is used for detecting voltage signals of the power distribution line, the analog-to-digital conversion module 203 is used for converting analog current signals detected by the current acquisition module 201 into digital current signals and then sending the digital current signals to the microprocessor 207 through the FPGA module 206, the analog voltage signals detected by the voltage acquisition module 202 are further used for converting the digital voltage signals and then sending the digital voltage signals to the microprocessor 207 through the FPGA module 206, and the first storage module 204 and the second storage module 205 are used for storing the current signals, the voltage signals and the like.
The microprocessor 207 is used for determining whether the distribution line has a fault according to the received current signal and the received voltage signal, acquiring a fault traveling wave signal through the current acquisition module 201 when the distribution line is determined to have a fault, and transmitting the fault traveling wave signal to the microprocessor 207, and the microprocessor 207 transmits the received fault traveling wave signal, the received current signal and the received voltage signal to the server through the wireless communication module 208.
And 102, determining a target traveling wave detection device and an abnormal traveling wave detection device according to the detection data sent by each traveling wave detection device.
For example, when receiving detection data sent by each traveling wave detection device, the server analyzes each detection data to determine whether the detection data contains a fault traveling wave signal, and if the detection data does not contain a fault traveling wave signal, determines that the traveling wave detection device without the fault traveling wave signal is an abnormal traveling wave detection device; and if the traveling wave signal with the fault exists in the detection data, determining the traveling wave detection device with the fault traveling wave signal as a target traveling wave detection device, and recording the identification information of the target traveling wave detection device.
It should be noted that the abnormal traveling wave detection device and the target traveling wave detection device may be determined according to whether the detection data includes voltage data or current data, that is, when it is determined that the detection data includes voltage data and/or current data, the traveling wave detection device including the voltage data and/or the current data is determined as the target traveling wave detection device; when it is determined that the detection data does not include the voltage data and/or the current data, the traveling wave detection device that does not include the voltage data and/or the current data is determined to be an abnormal traveling wave detection device.
The method of determining whether the traveling wave detection device is faulty or not based on the detection data may be other methods, for example, if it is determined that the clock module of the traveling wave detection device is faulty, it may be determined that the traveling wave detection device is an abnormal traveling wave detection device.
And 103, when the abnormal traveling wave detection device is determined, determining a target distance according to detection data sent by the target traveling wave detection device and a pre-stored power distribution network topological structure.
The detection data sent by the target traveling wave detection device comprises the initial time of the power distribution line fault and the target time of the initial traveling wave head in the fault traveling wave signal reaching the target traveling wave detection device.
For example, when the microprocessor 207 receives the fault traveling wave signal, the fault traveling wave signal is decomposed into a discrete mode signal by using a variational mode decomposition method, and the discrete mode signal is filtered to reduce interference of a noise signal; performing Hilbert transform on the filtered discrete modal signal to extract the instantaneous frequency of the modal component, and determining the time for the initial traveling wave head to reach the line at the position of the traveling wave detection device according to the instantaneous frequency of the modal component, namely the target time; and when determining that the distribution line has a fault, the microprocessor 207 records the initial time of the fault, packs the initial time of the fault and the determined target time into detection data and sends the detection data to the server, and when determining that an abnormal traveling wave detection device exists, the server eliminates the detection data of the abnormal traveling wave detection device, and determines a target distance used by a ranging algorithm according to the detection data sent by the target traveling wave detection device and a pre-stored topological structure of the power distribution network.
And step 104, determining the position of the line fault point according to the target distance, the target time, the initial time and a ranging algorithm.
In an example, a distance measurement algorithm is stored in the server in advance, the determined target distance, the target time for the initial traveling wave head in the fault traveling wave signal to reach the target traveling wave detection device, and the initial time for the distribution line to have a fault are input into the distance measurement algorithm, and a result finally output by the distance measurement algorithm is the position of the line fault point.
The invention provides a traveling wave fault positioning method, which comprises the steps of determining a target traveling wave detection device and an abnormal traveling wave detection device according to detection data, determining a target distance according to the detection data sent by the target traveling wave detection device and a power distribution network topological structure when the abnormal traveling wave detection device is determined, and determining the position of a line fault point according to the target distance and a distance measurement algorithm. Therefore, abnormal traveling wave detection devices can be eliminated, the positions of line fault points are determined by combining the detection data of the target traveling wave detection device with the pre-stored power distribution network topological structure, effective data can be screened out, the problem that the fault points cannot be determined due to faults of a certain traveling wave detection device is solved, and the reliability of locating the positions of the fault points is improved.
Example two
Fig. 3a is a flowchart of a traveling wave fault location method according to a second embodiment of the present invention. The technical scheme of the embodiment is further refined on the basis of the technical scheme, and specifically mainly comprises the following steps:
And 302, determining a target traveling wave detection device and an abnormal traveling wave detection device according to the detection data sent by each traveling wave detection device.
And 303, when the abnormal traveling wave detection device is determined, determining whether a fault line is between the first traveling wave detection device and the second traveling wave detection device according to the detection data sent by the first traveling wave detection device, the detection data sent by the second traveling wave detection device and the power distribution network topology structure.
The power distribution network topological structure comprises at least one ring-shaped sub-topological structure, the ring-shaped sub-topological structure comprises three nodes, and each node is provided with a traveling wave detection device; the target traveling wave detection device comprises a first traveling wave detection device and a second traveling wave detection device; the detection data sent by the target traveling wave detection device comprises the initial time of the power distribution line fault and the target time of the initial traveling wave head in the fault traveling wave signal reaching the target traveling wave detection device.
Optionally, the reference time of the fault traveling wave signal transmitted in the distribution line between the first traveling wave detection device and the second traveling wave detection device based on the speed of light is obtained; determining a difference value between the sum of the target time sent by the first traveling wave detection device and the target time sent by the second traveling wave detection device and twice the initial time to obtain a target time difference, and determining whether the difference value between the target time difference and the reference time is greater than a threshold value; determining that the faulty line is not between the first traveling wave detection device and the second traveling wave detection device when it is determined that the difference between the target time difference and the reference time is greater than the threshold value.
In an example, the target traveling wave detection device determined by the server is a first traveling wave detection device and a second traveling wave detection device, and the length of the power distribution line between the first traveling wave detection device and the second traveling wave detection device is obtained, and then the reference time is obtained by dividing the length of the power distribution line by the speed of light; meanwhile, the sum of the target time sent by the first traveling wave detection device and the target time sent by the second traveling wave detection device is differed from twice of the initial time to obtain a target time difference, the difference value between the target time difference and the reference time is compared with a threshold value, when the difference value between the target time difference and the reference time is determined to be larger than the threshold value, the difference between the target time difference and the reference time is larger, and at the moment, the fault line is determined not to be between the first traveling wave detection device and the second traveling wave detection device; and when the difference value between the target time difference and the reference time is determined to be less than or equal to the threshold value, the target time difference and the reference time are smaller and approximately equal, and the fault line is determined to be between the first traveling wave detection device and the second traveling wave detection device. The specific threshold value can be selected according to actual requirements, and is not limited.
It should be noted that, depending on the determination result, the following steps are also performed, and when it is determined that the faulty line is not between the first traveling wave detection device and the second traveling wave detection device, steps 304, 306 to 308 are performed; upon determining that the faulty line is between the first traveling wave detection device and the second traveling wave detection device, steps 305 to 308 are performed.
And 304, when it is determined that the fault line is not between the first traveling wave detection device and the second traveling wave detection device, determining the sum of the distance between the position of the first traveling wave detection device and the position of the abnormal traveling wave detection device and the distance between the position of the second traveling wave detection device and the position of the abnormal traveling wave detection device as the target distance.
As an example, as shown in fig. 3B, assuming that the traveling wave detection device 1 is installed at the point a, the traveling wave detection device 2 is installed at the point B, the traveling wave detection device 3 is installed at the point C, the horizontal distance between the point a and the point C is L0, the horizontal distance between the point B and the point C is L1, and the horizontal distance between the point a and the point B is L2, assuming that the server determines that the traveling wave detection device 2 is out of order and the traveling wave detection device 1 and the traveling wave detection device 3 are not out of order, the traveling wave detection device 2 is an abnormal traveling wave detection device, the traveling wave detection device 1 and the traveling wave detection device 3 are target traveling wave detection devices, and if it is determined that the faulty line is not between the traveling wave detection device 1 and the traveling wave detection device 3, the target distance is L1+ L2. In contrast, in the conventional technique, when the traveling wave detection device 2 fails, the server erroneously determines that the failure has occurred between the traveling wave detection device 1 and the traveling wave detection device 3, and specifies the failure position point based on L0.
Step 305, when it is determined that the fault line is between the first traveling wave detection device and the second traveling wave detection device, determining a distance between a position where the first traveling wave detection device is located and a position where the second traveling wave detection device is located as the target distance.
As an example, as shown in fig. 3C, the traveling wave detection device 1 is installed at a point a, the traveling wave detection device 2 is installed at a point B, the traveling wave detection device 3 is installed at a point C, the horizontal distance between the point a and the point C is L0, the horizontal distance between the point B and the point C is L1, and the horizontal distance between the point a and the point B is L2, assuming that the server determines that the traveling wave detection device 2 is faulty and the traveling wave detection device 1 and the traveling wave detection device 3 are not faulty, the traveling wave detection device 2 is an abnormal traveling wave detection device, the traveling wave detection device 1 and the traveling wave detection device 3 are target traveling wave detection devices, and if it is determined that the faulty line is between the traveling wave detection device 1 and the traveling wave detection device 3, the target distance is L0.
And step 306, determining the position of the line fault point according to the target distance, the target time, the initial time and a ranging algorithm.
Optionally, when the target traveling wave detection device includes a first traveling wave detection device and a second traveling wave detection device, the target traveling wave detection device is configured to detect a traveling wave of the target traveling wave according to a formula
And determining the position of the line fault point.
Wherein d ismfRepresents the horizontal distance between the fault point and the node where the first traveling wave detection device is located, L is the target distance, tmRepresents the time when the initial travelling wave head reaches the node where the first travelling wave detection device is located, tnRepresenting the time, t, at which the initial travelling-wave head reaches the node where the second travelling-wave detection means is located0Indicating the initial time of the line fault, α is a measurement coefficient.
Specifically, according to the formula L' ═ v (t)m-t0)+ν(tn-t0) And determining a first target length of the corresponding distribution line when the fault traveling wave signal is transmitted to the node where the first traveling wave detection device is located and the node where the second traveling wave detection device is located.
According to a formula d'mf＝v(tm-t0) And determining a second target length of the distribution line between the fault point and the node where the first traveling wave detection device is located.
According to the formula L' ═ v (t)m-t0)+v(tn-t0) And formula d'mf＝ν(tm-t0) And target distance determination formula
Wherein L' represents the first targetLength v represents propagation speed of fault travelling wave signal in distribution line d'mfRepresenting the second target length.
For example, assuming that a node where the first traveling wave detection device is located is a first node and a node where the second traveling wave detection device is located is a second node, the first length of the corresponding distribution line when the fault traveling wave signal propagates from the fault point to the first node is ν (t)m-t0) And the second length of the corresponding distribution line is v (t) when the fault traveling wave signal is transmitted from the fault point to the second noden-t0) If the first target length is the sum of the first length and the second length, the first target length is L' ═ v (t)m-t0)+v(tn-t0) (ii) a And the first length is a second target length, d'mf＝v(tm-t0) In practical applications, an empirical value exists between the length of the horizontal distance between the first node and the second node and the actual length of the line, and the line stretches uniformly in the same season, so that the ratio of the horizontal distance from the fault point to the first node to the horizontal distance between the first node and the second node is considered to be approximately equal to the ratio of the first length of the distribution line from the fault point to the first node to the first target length
And then can derive
Therefore, when the position of the line fault point is calculated, the propagation speed of the fault traveling wave signal in the distribution line is not needed, so that the calculation accuracy of the position of the line fault point is improved; in the prior art, the position of a fault point is calculated by combining with the propagation speed, the propagation speed is an uncertain quantity and has close relation with parameters, frequencies and the like of a distribution line, the central frequency of a fault traveling wave signal is also different under different fault conditions, and the propagation speed has a large error due to the influence of external factors such as environment and the likeAnd further, the calculated fault point position has a larger error, so that compared with the prior art, the method and the device improve the accuracy of calculating the fault point position of the line.
It should be noted that, when determining that the fault line is between the first traveling wave detection device and the second traveling wave detection device, the location of the fault point of the line may also be determined according to the double-ended traveling wave positioning method, and it is assumed that the two target traveling wave detection devices are the traveling wave detection device S1 and the traveling wave detection device S2, respectively, and the distance between the traveling wave detection device S1 and the traveling wave detection device S2 is k0The distance between the position of the line fault point and the traveling wave detection device S1 is k1The distance between the position of the line fault point and the traveling wave detection device S2 is k2Then, then
Wherein, t1The time when the traveling-wave signal of the fault propagates from the position of the fault point to the position of the traveling-wave detection device S1, t2V is the time when the traveling-wave fault signal propagates from the fault point to the traveling-wave detection device S2, and v is the propagation speed of the traveling-wave fault signal in the distribution line.
And 307, displaying the position of the line fault point.
For example, when the server determines the position of the line fault point, the server may broadcast the position information of the line fault point through voice, or display the position information of the line fault point through a short message, or directly display the position information of the line fault point on a display, where a specific display method on the display may be web page display, application program display, and the like. The operation and maintenance personnel can conveniently acquire the position of the line fault point, and the distribution line can be maintained in time according to the position of the line fault point, so that the line maintenance efficiency is improved.
The server may display the current signal of the distribution line, the voltage signal of the distribution line, and the like through a display, which is not limited in the present invention.
It should be noted that, the operation and maintenance personnel may also compare the obtained position information of the line fault point with fault information detected by other electronic devices on the distribution line, where the other electronic devices may be a distribution network automation switch or an FTU (Feeder Terminal Unit); to achieve a secondary confirmation of the line fault point.
And 308, acquiring the position of an actual fault point, and correcting the measurement coefficient according to the position of the actual fault point and the position of the line fault point.
For example, the operation and maintenance personnel may input the measured actual fault point position into the server, so that the server may compare the line fault point position with the actual fault point position to correct the measurement coefficient α, thereby further improving the accuracy of determining the fault point position.
It should be noted that, when the actual fault point position is obtained through measurement, the operation and maintenance personnel may also compare the line fault point position with the actual fault point position, correct the measurement coefficient α according to experience, and input the corrected measurement coefficient into the server, so that the server can conveniently position the fault point position according to the corrected measurement coefficient.
The invention provides a traveling wave fault positioning method, which comprises the steps of determining a target traveling wave detection device and an abnormal traveling wave detection device according to detection data, determining a target distance according to the detection data sent by the target traveling wave detection device and a power distribution network topological structure when the abnormal traveling wave detection device is determined, and determining the position of a line fault point according to the target distance and a distance measurement algorithm. Therefore, abnormal traveling wave detection devices can be eliminated, the positions of line fault points are determined by combining the detection data of the target traveling wave detection device with the pre-stored topological structure of the power distribution network, effective data can be screened out, the problem that the fault points cannot be determined due to the fault of a certain traveling wave detection device is solved, and the reliability of locating the positions of the fault points is improved; in addition, when the position of the line fault point is calculated, the propagation speed of the fault traveling wave signal in the distribution line is not needed, so that the accuracy of calculating the position of the line fault point is further improved.
EXAMPLE III
Fig. 4 is a structural diagram of a traveling wave fault location device according to a third embodiment of the present invention, where this embodiment is applicable to a scenario where a fault point in a power distribution network is located, and the method may be executed by the traveling wave fault location device according to the third embodiment of the present invention, and the device may be implemented in a software and/or hardware manner, and may be generally integrated in a computer device, as shown in fig. 4, the traveling wave fault location device specifically includes an obtaining module 401, a first determining module 402, a second determining module 403, and a third determining module 404.
The acquiring module 401 is configured to acquire detection data sent by each traveling wave detection apparatus.
A first determining module 402, configured to determine a target traveling wave detection apparatus and an abnormal traveling wave detection apparatus according to the detection data sent by each traveling wave detection apparatus.
A second determining module 403, configured to determine a target distance according to the detection data sent by the target traveling wave detection device and a pre-stored topology structure of the power distribution network when it is determined that there is an abnormal traveling wave detection device.
The detection data sent by the target traveling wave detection device comprises the initial time of the power distribution line fault and the target time of the initial traveling wave head in the fault traveling wave signal reaching the target traveling wave detection device.
And a third determining module 404, configured to determine a location of a line fault point according to the target distance, the target time, the initial time, and a ranging algorithm.
The invention provides a traveling wave fault positioning device, which determines a target traveling wave detection device and an abnormal traveling wave detection device according to detection data, determines a target distance according to the detection data sent by the target traveling wave detection device and a power distribution network topological structure when the abnormal traveling wave detection device is determined, and determines the position of a line fault point according to the target distance and a distance measurement algorithm. Therefore, abnormal traveling wave detection devices can be eliminated, the positions of line fault points are determined by combining the detection data of the target traveling wave detection device with the pre-stored power distribution network topological structure, effective data can be screened out, the problem that the fault points cannot be determined due to faults of a certain traveling wave detection device is solved, and the reliability of locating the positions of the fault points is improved.
Further, the power distribution network topology structure comprises at least one ring-shaped sub-topology structure, the ring-shaped sub-topology structure comprises three nodes, and a traveling wave detection device is arranged at each node; the target traveling wave detection device comprises a first traveling wave detection device and a second traveling wave detection device; the second determining module 403 includes:
and the first determining unit is used for determining whether the fault line is between the first traveling wave detection device and the second traveling wave detection device according to the detection data sent by the first traveling wave detection device, the detection data sent by the second traveling wave detection device and the power distribution network topology structure.
And a second determination unit, configured to determine, when it is determined that the faulty line is not between the first traveling wave detection device and the second traveling wave detection device, a sum of a distance between a position where the first traveling wave detection device is located and a position where the abnormal traveling wave detection device is located, and a distance between a position where the second traveling wave detection device is located and a position where the abnormal traveling wave detection device is located as the target distance.
And a third determining unit, configured to determine, when it is determined that the faulty line is between the first traveling wave detection device and the second traveling wave detection device, a distance between a position where the first traveling wave detection device is located and a position where the second traveling wave detection device is located as the target distance.
Further, the first determination unit includes:
and the acquisition subunit is used for acquiring the reference time of the fault traveling wave signal transmitted in the distribution line between the first traveling wave detection device and the second traveling wave detection device based on the speed of light.
A first determining subunit, configured to determine a difference between a sum of the target time sent by the first traveling wave detection device and the target time sent by the second traveling wave detection device and twice the initial time, to obtain a target time difference, and determine whether a difference between the target time difference and the reference time is greater than a threshold.
A second determining subunit, configured to determine that the faulty line is not between the first traveling-wave detecting device and the second traveling-wave detecting device when it is determined that the difference between the target time difference and the reference time is greater than the threshold value.
Further, the third determining module 404 includes:
a fourth determination unit for determining the formula
Determining the position of the line fault point;
wherein d ismfRepresents the horizontal distance between the fault point and the node where the first traveling wave detection device is located, L is the target distance, tmRepresents the time when the initial travelling wave head reaches the node where the first travelling wave detection device is located, tnRepresenting the time, t, at which the initial travelling-wave head reaches the node where the second travelling-wave detection means is located0Indicating the initial time of the line fault, α is a measurement coefficient.
Further, the formula
The determination method comprises the following steps:
v (t) according to the formula L ═ vm-t0)+v(tn-t0) Determining a first target length of a corresponding distribution line when the fault traveling wave signal is transmitted to a node where the first traveling wave detection device is located and a node where the second traveling wave detection device is located;
according to a formula d'mf＝ν(tn-t0) Determining a second target length of the distribution line between the fault point and the node where the first traveling wave detection device is located;
according to the formula L' ═ v (t)m-t0)+v(tn-t0) And formula d'mf＝v(tn-t0) And target distance determination formula
Wherein L 'represents the first target length, v represents the propagation speed of the fault traveling wave signal in the distribution line, d'mfRepresenting the second target length.
Further, the traveling wave fault locating device further includes:
and the display module is used for displaying the position of the line fault point.
Further, the apparatus further comprises:
and the correction module is used for acquiring the position of an actual fault point and correcting the measurement coefficient according to the position of the actual fault point and the position of the line fault point.
The traveling wave fault positioning device provided by the embodiment of the invention can execute the traveling wave fault positioning method provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the traveling wave fault positioning method.
Example four
As shown in fig. 5, which is a schematic structural diagram of a computer device according to a fourth embodiment of the present invention, as shown in fig. 5, the computer device includes:
one or more processors 510, one processor 510 being illustrated in FIG. 5;
a memory 520;
the computer device may further include: an input device 530 and an output device 540.
The processor 510, the memory 520, the input device 530 and the output device 540 of the computer apparatus may be connected by a bus or other means, and fig. 5 illustrates the connection by a bus as an example.
The memory 520 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to a traveling wave fault locating method in the embodiment of the present invention (for example, the obtaining module 401, the first determining module 402, the second determining module 403, and the third determining module 404 in the traveling wave fault locating apparatus). The processor 510 executes various functional applications and data processing of the computer device by executing software programs, instructions and modules stored in the memory 520, so as to implement a traveling wave fault location method as described above.
The memory 520 may mainly include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 520 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, the memory 520 may further include memory located remotely from the processor 510, which may be connected to the device/terminal/server via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 530 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the computer apparatus. The output device 540 may include a display device such as a display screen.
EXAMPLE five
Fifth, an embodiment of the present invention further provides a storage medium containing computer-executable instructions, which when executed by a computer processor, are configured to perform a method for locating a traveling wave fault, where the method includes:
acquiring detection data sent by each traveling wave detection device;
determining a target traveling wave detection device and an abnormal traveling wave detection device according to the detection data sent by each traveling wave detection device;
when the abnormal traveling wave detection device is determined, determining a target distance according to detection data sent by the target traveling wave detection device and a pre-stored power distribution network topological structure; the detection data sent by the target traveling wave detection device comprises the initial time of the fault of the distribution line and the target time of the initial traveling wave head in the fault traveling wave signal reaching the target traveling wave detection device;
and determining the position of the line fault point according to the target distance, the target time, the initial time and a ranging algorithm.
Of course, the storage medium containing the computer-executable instructions provided by the embodiments of the present invention is not limited to the method operations described above, and may also perform related operations in a traveling wave fault location method provided by any embodiment of the present invention.
From the above description of the embodiments, it is obvious for those skilled in the art that the present invention can be implemented by software and necessary general hardware, and certainly, can also be implemented by hardware, but the former is a better embodiment in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which may be stored in a computer-readable storage medium, such as a floppy disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a FLASH Memory (FLASH), a hard disk or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
It should be noted that, in the embodiment of the traveling wave fault location device, each included unit and module are only divided according to functional logic, but are not limited to the above division, as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A traveling wave fault locating method is characterized by comprising the following steps:
acquiring detection data sent by each traveling wave detection device;
determining a target traveling wave detection device and an abnormal traveling wave detection device according to the detection data sent by each traveling wave detection device;
when the abnormal traveling wave detection device is determined, determining a target distance according to detection data sent by the target traveling wave detection device and a pre-stored power distribution network topological structure; the detection data sent by the target traveling wave detection device comprises the initial time of the fault of the distribution line and the target time of the initial traveling wave head in the fault traveling wave signal reaching the target traveling wave detection device;
and determining the position of the line fault point according to the target distance, the target time, the initial time and a ranging algorithm.
2. The method according to claim 1, wherein the power distribution network topology comprises at least one ring-shaped sub-topology, wherein the ring-shaped sub-topology comprises three nodes, and wherein a traveling wave detection device is arranged at each node; the target traveling wave detection device comprises a first traveling wave detection device and a second traveling wave detection device;
the determining the target distance according to the detection data sent by the target traveling wave detection device and the pre-stored topological structure of the power distribution network comprises:
determining whether a fault line is between the first traveling wave detection device and the second traveling wave detection device according to the detection data sent by the first traveling wave detection device, the detection data sent by the second traveling wave detection device and the power distribution network topological structure;
when the fault line is determined not to be between the first traveling wave detection device and the second traveling wave detection device, the distance between the position of the first traveling wave detection device and the position of the abnormal traveling wave detection device, and the distance between the position of the second traveling wave detection device and the abnormal traveling wave detection device are determined
Determining the sum of the distances between the positions as the target distance;
and when the fault line is determined to be between the first traveling wave detection device and the second traveling wave detection device, determining the distance between the position of the first traveling wave detection device and the position of the second traveling wave detection device as the target distance.
3. The method of claim 2, wherein the determining whether the faulty line is between the first traveling wave detection device and the second traveling wave detection device according to the detection data sent by the first traveling wave detection device, the detection data sent by the second traveling wave detection device, and the power distribution network topology comprises:
acquiring reference time of the fault traveling wave signal transmitted in a distribution line between the first traveling wave detection device and the second traveling wave detection device based on the speed of light;
determining a difference value between the sum of the target time sent by the first traveling wave detection device and the target time sent by the second traveling wave detection device and twice the initial time to obtain a target time difference, and determining whether the difference value between the target time difference and the reference time is greater than a threshold value;
determining that the faulty line is not between the first traveling wave detection device and the second traveling wave detection device when it is determined that the difference between the target time difference and the reference time is greater than the threshold value.
4. The method of claim 2, wherein said determining a line fault point location from said target distance, said target time, said initial time, and a ranging algorithm comprises:
according to the formula
Determining the position of the line fault point;
wherein d ismfRepresents the horizontal distance between the fault point and the node where the first traveling wave detection device is located, L is the target distance, tmRepresents the time when the initial travelling wave head reaches the node where the first travelling wave detection device is located, tnRepresenting the time, t, at which the initial travelling-wave head reaches the node where the second travelling-wave detection means is located0Indicating the initial time of the line fault, α is a measurement coefficient.
5. The method of claim 4, wherein the formula
The determination method comprises the following steps:
v (t) according to the formula L ═ vm-t0)+ν(tn+t0) Determining a first target length of a corresponding distribution line when the fault traveling wave signal is transmitted to a node where the first traveling wave detection device is located and a node where the second traveling wave detection device is located;
according to a formula d'mf＝ν(tm-t0) Determining a second target length of the distribution line between the fault point and the node where the first traveling wave detection device is located;
v (t) according to the formula L ═ vm-t0)+ν(tn-t0) And formula d'mf＝ν(tm-t0) And target distance determination formula
Wherein L 'represents the first target length, v represents the propagation speed of the fault traveling wave signal in the distribution line, d'mfRepresenting the second target length.
6. The method of claim 1, after determining a line fault point location based on the target distance, the target time, the initial time, and a ranging algorithm, further comprising:
and displaying the position of the line fault point.
7. The method of claim 1, after determining a line fault point location based on the target distance, the target time, the initial time, and a ranging algorithm, further comprising:
acquiring the position of an actual fault point;
and correcting the measurement coefficient according to the actual fault point position and the line fault point position.
8. A traveling wave fault locating device, comprising:
the acquisition module is used for acquiring detection data sent by each traveling wave detection device;
the first determining module is used for determining a target traveling wave detection device and an abnormal traveling wave detection device according to the detection data sent by each traveling wave detection device;
the second determining module is used for determining a target distance according to detection data sent by the target traveling wave detection device and a pre-stored topological structure of the power distribution network after the abnormal traveling wave detection device is determined; the detection data sent by the target traveling wave detection device comprises the initial time of the fault of the distribution line and the target time of the initial traveling wave head in the fault traveling wave signal reaching the target traveling wave detection device;
and the third determining module is used for determining the position of the line fault point according to the target distance, the target time, the initial time and a distance measuring algorithm.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the method according to any of claims 1-7 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-7.
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