CN113514733A - Fault positioning method and device, computer equipment and storage medium - Google Patents
Fault positioning method and device, computer equipment and storage medium Download PDFInfo
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- CN113514733A CN113514733A CN202111041275.6A CN202111041275A CN113514733A CN 113514733 A CN113514733 A CN 113514733A CN 202111041275 A CN202111041275 A CN 202111041275A CN 113514733 A CN113514733 A CN 113514733A
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G01—MEASURING; TESTING
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
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Abstract
The application relates to a fault positioning method, a fault positioning device, computer equipment and a storage medium. The method comprises the following steps: and inputting a detection pulse signal to the detection end of the grounding electrode circuit, receiving a signal to be detected from the detection end, then determining the signal characteristic of the signal to be detected, and carrying out fault positioning according to the signal characteristic of the signal to be detected and the reference information. The detection end is one end of the grounding electrode circuit close to the rectifying side circuit, the signal to be detected is a reflected signal generated by transmission of the detection pulse signal in the grounding electrode circuit, and the reference information comprises signal characteristics and fault information of a plurality of fault signals. By adopting the method, the efficiency of positioning the fault of the grounding electrode line can be improved.
Description
Technical Field
The present application relates to the field of dc power transmission technologies, and in particular, to a fault location method and apparatus, a computer device, and a storage medium.
Background
With the development of the direct-current transmission technology, a bipolar two-end neutral point grounding operation mode is widely applied to a direct-current transmission system at present. The grounding electrode line is a return channel of working current in monopolar operation of the direct current transmission system and a standby channel in bipolar operation of the direct current transmission system. Therefore, the stable operation of the direct current transmission system is influenced by the fault of the grounding electrode line. In order to ensure the stable operation of a direct current transmission system and the safety of personal equipment, a fault point needs to be positioned in time after a fault occurs in an earth electrode line.
In the conventional technology, a pulse signal is injected into an earth electrode line through earth electrode line fault distance measuring equipment, and the position of a fault point is calculated according to an obtained reflected signal and line parameters of the earth electrode line.
However, in the current fault location mode, complex processing and calculation need to be performed on the reflected signals, the process is complicated, rapid location of the fault cannot be realized, and the efficiency of fault location is not high.
Disclosure of Invention
In view of the above, it is necessary to provide a fault location method, an apparatus, a computer device, and a storage medium capable of improving efficiency of fault location in view of the above technical problems.
A fault positioning method is applied to an earth electrode line in a direct current transmission system, the direct current transmission system comprises a converter station, a high-voltage direct current line and the earth electrode line, and the method comprises the following steps:
inputting a detection pulse signal to a detection end of the grounding electrode circuit, and receiving a signal to be detected from the detection end; the detection end is one end of the grounding electrode circuit close to the converter station, and the signal to be detected is a reflected signal generated by transmission of the detection pulse signal in the grounding electrode circuit;
determining the signal characteristics of the signal to be detected, and performing fault positioning according to the signal characteristics of the signal to be detected and the reference information; the reference information includes signal characteristics of the plurality of fault signals and fault information.
In one embodiment, the method further comprises the following steps: establishing a simulation circuit of the grounding electrode circuit according to the circuit parameters of the grounding electrode circuit; the line parameters comprise the impedance of the grounding electrode line and the length of the grounding electrode line; determining a plurality of simulation fault points of the simulation line to respond to a simulation fault signal of the detection pulse signal in a simulation environment; and respectively extracting signal characteristics of a plurality of simulated fault signals corresponding to the plurality of simulated fault points, and determining reference information according to the fault information of the plurality of simulated fault points and the result of the signal characteristic extraction.
In one embodiment, the method further comprises the following steps: determining a plurality of test fault points of the grounding electrode line, responding to a test fault signal of the detection pulse signal; and respectively extracting signal characteristics of a plurality of test fault signals corresponding to the plurality of test fault points, and determining the actually measured reference information according to the fault information of the plurality of test fault points and the result of the signal characteristic extraction.
In one embodiment, the method further comprises the following steps: determining a first signal characteristic matched with the signal characteristic of the signal to be detected in the reference information; determining a second signal characteristic matched with the signal characteristic of the signal to be detected in the actually measured reference information; and carrying out fault positioning according to first fault information corresponding to the first signal characteristic in the reference information and second fault information corresponding to the second signal characteristic in the actually measured reference signal.
In one embodiment, the method further comprises the following steps: and updating the signal characteristics of the simulated fault signal of the simulated fault point and the fault information of the simulated fault point, which correspond to the test fault point in the reference information, according to the signal characteristics of the test fault signal in the actually measured reference information and the fault information of the test fault point.
In one embodiment, the fault location according to the signal characteristics of the signal to be detected and the reference information includes: determining signal characteristics matched with the signal characteristics of the signal to be detected in the reference information, and determining target fault information corresponding to the signal characteristics matched with the signal characteristics of the signal to be detected; and carrying out fault positioning based on the target fault information.
In one embodiment, determining a signal characteristic of the signal to be detected further comprises: and performing modulus component extraction processing on the signal to be detected to obtain the linear modulus component characteristics of the signal to be detected.
A fault locating device, the device comprising:
the acquisition module is used for inputting a detection pulse signal to the detection end of the grounding electrode circuit and receiving a signal to be detected from the detection end; the detection end is one end of the grounding electrode circuit close to the converter station, and the signal to be detected is a reflected signal generated by transmission of the detection pulse signal in the grounding electrode circuit;
the determining module is used for determining the signal characteristics of the signal to be detected and carrying out fault positioning according to the signal characteristics of the signal to be detected and the reference information; the reference information includes signal characteristics of the plurality of fault signals and fault information.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
inputting a detection pulse signal to a detection end of the grounding electrode circuit, and receiving a signal to be detected from the detection end; the detection end is one end of the grounding electrode circuit close to the converter station, and the signal to be detected is a reflected signal generated by transmission of the detection pulse signal in the grounding electrode circuit;
determining the signal characteristics of the signal to be detected, and performing fault positioning according to the signal characteristics of the signal to be detected and the reference information; the reference information includes signal characteristics of the plurality of fault signals and fault information.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
inputting a detection pulse signal to a detection end of the grounding electrode circuit, and receiving a signal to be detected from the detection end; the detection end is one end of the grounding electrode circuit close to the converter station, and the signal to be detected is a reflected signal generated by transmission of the detection pulse signal in the grounding electrode circuit;
determining the signal characteristics of the signal to be detected, and performing fault positioning according to the signal characteristics of the signal to be detected and the reference information; the reference information includes signal characteristics of the plurality of fault signals and fault information.
According to the fault positioning method, the fault positioning device, the computer equipment and the storage medium, the signal generator and the signal acquisition device can input the detection pulse signal to the detection end of the grounding electrode circuit and receive the corresponding signal to be detected when the fault occurs from the detection end. Then, the computer device can compare the signal characteristics of the signal to be detected with the signal characteristics of the simulated fault signal in the reference information, thereby completing fault positioning. According to the method and the device, after the corresponding signal to be detected when a fault occurs is obtained, the fault location is carried out by carrying out complex calculation on the signal to be detected through a mathematical method, but the fault information is determined by comparing the signal characteristics of the signal to be detected with the signal characteristics of the simulated fault signal of the reference information, so that the efficiency of locating the fault of the grounding electrode line is improved.
Drawings
FIG. 1 is a diagram of an exemplary implementation of a fault location method;
FIG. 2 is a schematic flow chart diagram of a fault location method in one embodiment;
FIG. 3 is a diagram illustrating the steps for determining reference information in one embodiment;
FIG. 4 is a simulation diagram of ground trace fault location in one embodiment;
FIG. 5 is a schematic diagram illustrating the steps for determining measured reference information according to one embodiment;
FIG. 6 is a schematic flow chart diagram of a fault location method in another embodiment;
FIG. 7 is a diagram illustrating the steps of fault location according to the signal characteristics of the signal to be detected and the reference information in one embodiment;
FIG. 8 is a diagram of a fault attachment network in the event of a single-wire ground fault in one embodiment;
FIG. 9 is a plot of the additional equivalent network for the point of failure modulus at a single line ground fault in one embodiment;
FIG. 10 is a diagram of an additional network of faults in the event of a two-wire short fault in one embodiment;
FIG. 11 is a plot of the additional equivalent network of failure point modulus at the time of a two-wire short fault in one embodiment;
FIG. 12 is a diagram of an additional network of faults in the event of a two-wire short to ground fault in one embodiment;
FIG. 13 is a plot of additional equivalent network for point of failure modulus at a two-wire short to ground fault in one embodiment;
FIG. 14 is a block diagram of the structure of a fault locating device in one embodiment;
FIG. 15 is a block diagram showing the construction of a fault locating device according to another embodiment;
FIG. 16 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The fault locating method provided by the application can be applied to a direct current power transmission system shown in fig. 1. Wherein, it is straightThe current transmission system may comprise a converter station 100, a high voltage direct current line 110 and an earth electrode line 120. The converter station 100 may comprise an alternating current source AC1、AC2Converter station transformer T1、T2And a converter HB1、HB2The HVDC line 110 may include two lines, pole I and pole II, with I being a dual linedMay be the main loop current during dual line operation of the HVDC line, and the grounding electrode line 120 may include an X1、X2Two lines capable of two-wire operation. The signal generator and the collecting device can be connected to one end of the grounding electrode line close to the convertor station, and the computer equipment is communicated with the signal generator and the collecting device through a network. The computer equipment can compare the signal characteristics of the signals to be detected received by the signal generator and the acquisition device with the signal characteristics of the simulated fault signals in the reference information, thereby quickly completing fault positioning.
In one embodiment, as shown in fig. 2, a fault location method is provided, which is described by taking the method as an example applied to the dc power transmission system in fig. 1, and includes the following steps:
s202, inputting a detection pulse signal to a detection end of the grounding electrode circuit, and receiving a signal to be detected from the detection end; the detection end is one end of the grounding electrode circuit close to the converter station; the signal to be detected is a reflected signal generated by transmission of the detection pulse signal in the grounding electrode circuit.
In a direct current transmission system, the earth electrode line may be a line connected between a direct voltage neutral point of the converter station and an earth electrode. The grounding electrode line can adopt an overhead line and a cable line, and is generally about 10km to 100km long. Under the single-pole loop operation mode of the direct current transmission system, the current flowing through the grounding electrode line is large, and the fault point can be accurately positioned by detecting a transient traveling wave signal generated by the fault point when the fault of the grounding electrode line occurs. However, in the bipolar balance operation mode of the direct current transmission system, the bipolar unbalanced current flowing through the grounding electrode line is very small, so that the generated traveling wave model is very weak, and at this time, fault location can be performed by injecting a detection pulse signal into the grounding electrode line. This embodiment will be described by taking an example of fault localization by injecting a detection pulse signal into the ground electrode line.
In one possible implementation, the detection end may be an end of the earth electrode line close to the same side converter station. The signal generator and the acquisition device can be connected in parallel at the detection end, and a detection pulse signal is injected to the grounding end direction of the grounding electrode circuit. The detection pulse signal can be a high-frequency pulse voltage signal, and the frequency of the detection pulse signal can be adaptively set according to the parameters of the grounding electrode circuit and the actual engineering requirements. The higher the frequency of detecting the pulse signal, the higher the fault detection accuracy thereof, and for example, a 10Mhz pulse signal can reach a fault detection accuracy of 15m at the minimum.
The signal to be detected can be a signal reflected back by a reflection phenomenon when the detection pulse signal meets a fault point or reaches a grounding point of a grounding end in transmission. When the grounding electrode line has a fault, under the action of the same detection pulse signal, the characteristics of the signals to be detected reflected back by different fault points are different, and the characteristics of the signals to be detected reflected back by the same fault point and different fault types are also different. Illustratively, taking the same type of fault at different fault points as an example, the signal generator and the acquisition device continuously inject detection pulse signals into a 100km overall length of the earth electrode line, assuming that the fault occurs at a distance of 20km, the signal generator and the acquisition device receive the returned corresponding signal to be detected as a1, and assuming that after the same type of fault occurs at a distance of 40km, the signal generator and the acquisition device receive the returned corresponding signal to be detected as a2, the amplitude, the shape, and the transmitting and receiving time difference of the signal waveforms of a1 and a2 are different.
Specifically, the detection end of the present embodiment may be connected in parallel to a signal generator and a signal acquisition device, and the detection pulse signal is continuously input to the grounding end of the grounding electrode line through the signal generator and the signal acquisition device. Furthermore, when the detection pulse signal meets a fault point or reaches a grounding point of a grounding end, a reflection phenomenon can occur, a signal to be detected is generated, and the signal generator and the acquisition device can receive the signal to be detected from the detection end.
S204, determining the signal characteristics of the signal to be detected, and performing fault location according to the signal characteristics of the signal to be detected and the reference information; the reference information includes signal characteristics of the plurality of analog fault signals and fault information.
The signal characteristics may be amplitude, frequency, shape, and time difference between transmission and reception of the signal waveform, which are not limited herein. The fault information may include a fault location, which may be characterized using a distance of a fault point from the detection terminal, and a fault type, which may include a single-wire ground fault, a two-wire short-circuit fault, and a two-wire short-circuit ground fault. The analog fault signal may be a signal to be detected by the signal generator and the acquisition device after a fault occurs in the reference information.
In one possible implementation, as seen in S202 above, the signal characteristics of the fault signal may correspond to the fault information in a one-to-one manner. Further, the computer device can establish a full-line fault database of the grounding electrode circuit through the one-to-one correspondence relationship between the signal characteristics of the plurality of fault signals and the fault information. Illustratively, for a full-length 100km earth electrode line, one fault point is preset every 50m, and the full-line fault database thereof may include signal characteristics of fault signals of each fault point when each fault point individually fails and fault information. The reference information may be information in the above-mentioned full-line fault database.
Specifically, when a fault occurs in the actual operation process of the grounding electrode circuit, the signal generator and the acquisition device can receive a signal to be detected corresponding to the fault from the detection end. Further, the computer device may extract a signal feature of the signal to be detected, perform feature comparison with a signal feature of the analog fault signal in the reference information, extract a signal feature of an analog fault signal having the highest similarity with the signal feature of the signal to be detected, and determine fault information corresponding to the analog signal as fault information of the signal to be detected. Exemplarily, assuming that the computer device confirms the characteristics of the fault information of the signal to be detected through characteristic comparison, and the characteristics are most similar to the characteristics of the fault information corresponding to the single-line short-circuit fault at the 20km position of the grounding electrode line in the reference information, it can be confirmed that the fault information corresponding to the signal to be detected is that the single-line short-circuit fault occurs at the 20km position of the grounding electrode line.
In this embodiment, the signal generator and the signal acquisition device can input a detection pulse signal to the detection end of the grounding electrode line, and receive a corresponding signal to be detected when a fault occurs from the detection end. Then, the computer device can compare the signal characteristics of the signal to be detected with the signal characteristics of the simulated fault signal in the reference information, thereby completing fault positioning. In the embodiment of the application, after the corresponding signal to be detected when a fault occurs is obtained, the fault location is performed by comparing the signal characteristics of the signal to be detected with the signal characteristics of the simulated fault signal of the reference information to determine the fault information without performing complex calculation on the signal to be detected by a mathematical method, so that the efficiency of locating the fault of the grounding electrode line is improved.
In one embodiment, as shown in fig. 3, on the basis of the above embodiment, the method further includes:
s302, establishing a simulation circuit of the grounding electrode circuit according to the circuit parameters of the grounding electrode circuit; the line parameters include the impedance of the grounding electrode line and the length of the grounding electrode line.
In the above embodiment, the computer device uses the information in the all-wire fault database as the reference information when confirming the fault information of the signal to be detected. The reference information may be obtained by performing simulation tests on various faults occurring at each preset fault point through various simulation software such as an EMTDC/PSCAD and the like by the computer device.
In a possible implementation manner, the computer device may complete the setting of the ground electrode line fault simulation parameters according to the actual line parameters of the ground electrode line based on the EMTDC/PSCAD simulation software, so as to establish the simulated line model of the ground electrode line. Taking the grounding electrode line corresponding to one side converter station as an example, a simulation schematic diagram of the fault location of the grounding electrode line is shown in fig. 4, wherein an inductor L1 and a capacitor T-C are shown2Direct current filter, signal acquisition and generation device formed by grounding after series connectionAX is passed through coupling capacitor C1、C2And F represents the position of the fault occurrence point of the grounding electrode line.
S304, determining a plurality of simulation fault points of the simulation line to respond to the simulation fault signal of the detection pulse signal under the simulation environment.
Wherein, the simulation fault point can be determined according to the simulation parameters of the simulation line model. For example, if the frequency of the detection pulse signal is 10Mhz, a simulation fault point may be set every 50m, and the simulation fault point may be subjected to analog fault simulation.
In one possible implementation, the computer device may simulate a single-wire ground fault at 20km of the ground electrode line for the simulated line, and obtain a simulated fault signal corresponding to the simulated fault point. Further, the computer device can perform simulation experiments on the plurality of simulation fault points to obtain simulation fault signals of the plurality of simulation fault points in response to the detection pulse signals in the simulation environment. The fault information of the simulation fault point is in one-to-one correspondence with the simulation fault signal.
S306, respectively extracting signal characteristics of the plurality of simulated fault signals corresponding to the plurality of simulated fault points, and determining reference information according to the fault information of the plurality of simulated fault points and the result of the signal characteristic extraction.
In one possible implementation, the fault information of the simulated fault point corresponds to the simulated fault signal thereof in a one-to-one manner. Therefore, the computer device can extract the signal characteristics of the simulated fault signals corresponding to the plurality of simulated fault points, establish a one-to-one correspondence set between the plurality of signal characteristics and the simulated fault information thereof, and store the signal characteristics and the simulated fault information in the full-line fault database to be used as reference information.
In this embodiment, the computer device establishes a fault simulation line model of the ground electrode line through simulation software, may simulate various faults occurring at a plurality of simulation fault points, and obtains corresponding simulation fault signals, and stores signal characteristics of the simulation fault signals corresponding to the plurality of fault points and corresponding fault information in an all-line fault database after establishing a one-to-one correspondence relationship, as reference information when an actual fault occurs. The embodiment can realize the full coverage of the fault information of a plurality of simulation fault points, namely, the embodiment can acquire the generated simulation fault signal when any fault occurs at any position in the grounding electrode circuit by carrying out a fault simulation experiment on the grounding electrode circuit, thereby greatly enriching the information quantity of the reference information and improving the prediction range and the prediction efficiency of fault prediction.
In one embodiment, as shown in fig. 5, on the basis of the above embodiment, the method further includes:
and S502, determining a plurality of test fault points of the grounding electrode line, and responding to a test fault signal of the detection pulse signal.
In the above embodiment, the computer device uses the information in the all-wire fault database as the reference information when confirming the fault information of the signal to be detected. The reference information can be obtained through field tests when the grounding electrode line is built.
The test fault point can be determined according to the actual layout condition of the grounding electrode circuit. For example, a position where the grounding electrode line is prone to failure in theory when the grounding electrode line is laid can be selected as a test failure point, for example, near a tower pole where the grounding electrode line is erected.
After the grounding electrode circuit is built, test operation can be carried out. In one possible implementation manner, during the trial operation of the grounding electrode line, the signal generator and the acquisition device are connected in parallel at the detection point, and the detection pulse signal is continuously injected into the grounding end of the grounding electrode line. Then, aiming at the test fault point, various faults are artificially produced, and a corresponding test fault signal when the test fault point is in fault can be obtained. Further, the signal generator and the acquisition device can acquire a plurality of test fault points and respond to the test fault signals of the detection pulse signals. The fault information of the test fault point is in one-to-one correspondence with the test fault signals thereof.
S504, respectively extracting signal characteristics of a plurality of test fault signals corresponding to the plurality of test fault points, and determining actual measurement reference information according to fault information of the plurality of test fault points and a signal characteristic extraction result.
In one possible implementation, the fault information of the test fault point corresponds to the test fault signal thereof in a one-to-one manner. Therefore, the computer device can extract the signal characteristics of the test fault signals corresponding to the plurality of test fault points, establish a one-to-one correspondence set between the plurality of signal characteristics and the test fault information thereof, and store the signal characteristics and the test fault information in the full-line fault database to be used as reference information.
In this embodiment, the signal generator and the acquisition device may determine a plurality of test fault points of the ground electrode line, and respond to a test fault signal of the detection pulse signal. Then, the computer device can respectively extract the signal characteristics of a plurality of test fault signals corresponding to a plurality of test fault points, and determine the actual measurement reference information according to the fault information of the plurality of test fault points and the result of the signal characteristic extraction. Because the test fault signal in the embodiment is actually measured through a field experiment, the signal characteristic is more accurate. The reference information composed of the signal characteristics of the test fault signal can more accurately reflect the corresponding relation between the test fault information of the test fault point and the signal characteristics of the test fault signal, so that the accuracy of fault prediction is improved.
In one embodiment, as shown in fig. 6, on the basis of the above embodiment, the method further includes:
s602, determining a first signal characteristic matched with the signal characteristic of the signal to be detected in the reference information.
The reference information is obtained based on simulation experiments, and the signal characteristics of the plurality of simulated fault signals and the corresponding simulated fault information are obtained. The first signal characteristic may be a signal characteristic of the analog fault signal of the reference information having the highest similarity to the signal characteristic of the signal to be detected. If the similarity between the signal characteristics of the signal to be detected and the signal characteristics of one analog fault signal is highest, the fault information of the signal to be detected can be represented, and the fault information is the same as the simulation fault information corresponding to the analog fault signal.
In a possible implementation manner, the computer device may determine that the signal feature of the analog fault signal with the highest similarity is the first signal feature by calculating similarities between the signal feature of the signal to be detected and the signal features of the plurality of analog fault signals in the reference information.
S604, determining a second signal characteristic matched with the signal characteristic of the signal to be detected in the actually measured reference information.
The actual measurement reference information is obtained based on a field test, and the signal characteristics of a plurality of test fault signals and corresponding test fault information are obtained. The second signal characteristic may be a signal characteristic of the test fault signal having the highest similarity to the signal characteristic of the signal to be detected in the measured reference information.
Illustratively, if the amplitude difference between the signal to be detected and one of the test fault signals in the actually measured reference information is minimum, the difference between the transmitting and receiving time differences is minimum, and the pattern coincidence degree of the signal waveform is highest, the similarity between the two is highest. The signal characteristics of the signal to be detected and the signal characteristics of a test fault signal have the highest similarity, and can represent the fault information of the signal to be detected, and the fault information is the same as the test fault information corresponding to the test fault signal.
In a possible implementation manner, the computer device may determine that the signal feature of the test fault signal with the highest similarity is the second signal feature by calculating the similarity between the signal feature of the signal to be detected and the signal features of the plurality of test fault signals in the actually measured reference information.
S606, fault positioning is carried out according to first fault information corresponding to the first signal characteristics in the reference information and second fault information corresponding to the second signal characteristics in the actually measured reference signal.
The earth electrode circuit can generate more interference signals during actual operation, and the types and the sizes of the interference signals are continuously changed along with the change of the operation state and the operation environment of the circuit, so that certain errors can be generated when the reference information or the actually measured reference information is used for positioning faults.
In a possible implementation manner, the computer device may perform weighted averaging according to first fault information corresponding to the first signal characteristic in the reference information and second fault information corresponding to the second signal characteristic in the measured reference signal to confirm the fault information of the fault. Illustratively, if the first fault information corresponding to the first signal characteristic in the reference information is that a single-wire ground fault has occurred at 20km of the ground electrode line; if the second fault information corresponding to the second signal characteristic in the actually measured reference signal is that a single-wire ground fault occurs at 20.2km of the grounding electrode line, the computer device may determine that the single-wire ground fault occurs at 20.1km of the grounding electrode line.
In this embodiment, the computer device may determine a first signal feature in the reference information that matches a signal feature of the signal to be detected, may also determine a second signal feature in the actually measured reference information that matches the signal feature of the signal to be detected, and then performs weighted average according to the first fault information in the reference information that corresponds to the first signal feature and the second fault information in the actually measured reference signal that corresponds to the second signal feature, thereby implementing fault location, reducing errors in fault location, and improving accuracy in fault location.
In one embodiment, on the basis of the above embodiments, the method further includes:
and updating the signal characteristics of the simulated fault signal of the simulated fault point corresponding to the test fault point and the fault information of the simulated fault point in the reference information according to the signal characteristics of the test fault signal in the actually measured reference information and the fault information of the test fault point.
In a possible implementation manner, when the fault of the grounding electrode line is positioned, although an error exists in the actually measured reference information obtained through a field test, the accuracy of the actually measured reference information is often higher than that of the reference information obtained through a simulation experiment, so that the actually measured reference information can be used for correcting the reference information, and the accuracy of the reference information is improved. For example, if the reference information and the measured reference information both include a fault signal when a single-line ground fault occurs at 20km of the ground electrode line, the fault signal when the single-line ground fault occurs at 20km of the measured reference information may be used to update the fault signal when the single-line ground fault occurs at 20km of the reference information.
In this embodiment, the computer device may update, according to the signal characteristics of the test fault signal and the fault information of the test fault point in the actually measured reference information, the signal characteristics of the simulated fault signal of the simulated fault point corresponding to the test fault point and the fault information of the simulated fault point in the reference information, thereby improving the accuracy of the reference information and the accuracy of fault location.
In one embodiment, as shown in fig. 7, based on the above embodiment, the fault location according to the signal characteristics of the signal to be detected and the reference information includes:
s702, determining the signal characteristics matched with the signal characteristics of the signal to be detected in the reference information, and determining target fault information corresponding to the signal characteristics matched with the signal characteristics of the signal to be detected.
In one possible implementation, the computer device may confirm whether the signal feature of the signal to be detected and the signal feature in the reference information match by calculating a similarity between the two. Specifically, the computer device may calculate indexes such as a difference between an amplitude of a signal feature of the signal to be detected and a signal feature in the reference information, a difference between transmission and reception time differences, and a graph overlap ratio of a signal waveform, and weight the index data to obtain a similarity value. Illustratively, if the amplitude difference between the signal to be detected and one of the fault signals in the reference information is minimum, the difference between the transmitting and receiving time differences is minimum, and the pattern coincidence degree of the signal waveform is highest, the similarity of the characteristic signals between the two is highest, so that the two can be confirmed to be matched.
And S704, carrying out fault positioning based on the target fault information.
Specifically, the computer device may extract a fault type and a fault location of the target fault information, and confirm the fault type and the fault location as fault information corresponding to the signal to be detected, thereby implementing fault location.
In this embodiment, the computer device can determine target fault information corresponding to the signal feature matched with the signal feature of the signal to be detected by determining the signal feature matched with the signal feature of the signal to be detected in the reference information, and then perform fault location based on the target fault information, thereby realizing rapid location of a fault of a ground pole line and improving the efficiency of fault location.
In one embodiment, on the basis of the above embodiments, the determining the signal characteristic of the signal to be detected includes:
and performing modulus component extraction processing on the signal to be detected to obtain the linear modulus component characteristics of the signal to be detected.
In the earth electrode line, a fault point generates a transient traveling wave surge signal when the fault point is in fault, and the signal and a reflection signal generated when an injected detection pulse signal meets the fault point are jointly superposed to form a corresponding signal to be detected when the fault point is in fault. The traveling wave surge signal contains two independent mode components of a zero mode and a line mode, and the propagation characteristics of different mode components are different. The propagation characteristics of different mode components are deeply explained when the grounding pole line fails as follows:
the two line voltages of the fault point are respectively UF1And UF2Two line currents are respectively IF1And IF2Then the zero mode voltage, current component (denoted by subscript "0") and the line mode voltage, current component (denoted by subscript "α") of the fault point can be expressed as:
first, if the fault type of the grounding electrode line is a single-wire grounding fault, the fault additional network when the grounding electrode line has a single-wire (taking wire 1 as an example) grounding fault is shown in fig. 8, where M1 and M2 represent the measurements of wire 1 and wire 2, respectivelyThe end-measuring directions, N1 and N2, respectively, characterize the grounding direction of line 2. Additional voltage source UF1The voltage of (d) can be expressed as:
in the formula of UM1And IM1Respectively a steady state voltage signal and a current signal of the line 1 under the normal operation condition of the measuring end M; r' is the resistance of the grounding electrode line per kilometer; and L is the distance from the fault point to the end M.
The boundary conditions of the fault point are:
the corresponding mode domain boundary conditions are:
in the formula RFGThe value of the transition resistance at the fault point influences the amplitude of the modulus of the travelling wave surge. As shown in fig. 9, the additional equivalent network of the failure point modulus can be plotted according to equation (5).
As can be seen from equation (5), the zero mode and line mode components at the fault point are not independent, and are electrically coupled to each other, and the line mode current and the zero mode current are equal.
The initial traveling wave surge voltage of each mode of the fault point can be obtained from fig. 9:
wherein Z0For zero mode impedance of the line, ZαIs the line mode impedance.
Next, if the type of the ground electrode line is a two-line short-circuit fault, the fault additional network at the time of the two-line short-circuit fault is as shown in fig. 10, where R isFFor a two-wire transition resistance, the voltages of the two additional voltage sources can be expressed as:
in the formula of UM1And IM1Respectively a steady state voltage signal and a current signal of the line 1 under the condition of fault-free operation of the M end; u shapeM2And IM2Respectively a steady state voltage signal and a current signal of the line 2 under the condition of fault-free operation of the M end; r' is the resistance of the grounding electrode line per kilometer; and L is the distance from the fault point to the end M.
The boundary conditions of the fault point are:
the corresponding mode domain boundary conditions are:
in the formula, RFThe value of the transition resistance between two lines of the fault point influences the amplitude of the modulus of the travelling wave surge.
It can be seen from formula (9) that only line mode traveling wave surge is generated when two lines are in short circuit fault, and zero mode traveling wave surge is not generated.
The additional equivalent network of the failure point modulus can be plotted according to equation (9), as shown in fig. 11. The initial traveling wave surge voltage of the line mode of the fault point can be obtained from fig. 11:
finally, if the type of the grounding electrode line is a two-wire short-circuit grounding fault, the fault additional network when the two-wire short-circuit grounding fault occurs is as shown in fig. 12, and the voltage of the additional voltage source is the same as formula (7).
The boundary conditions of the fault point are:
the corresponding mode domain boundary conditions are:
in the formula, RFGThe value of the transition resistance at the fault point influences the amplitude of the modulus of the travelling wave surge.
It can be seen that when two lines are in short circuit and grounded fault, the zero mode and line mode travelling wave surge are generated simultaneously, and the mode value of the travelling wave surge is related to the magnitude of the transition resistance of the fault point. The failure point modulus attachment equivalent network is shown in fig. 13. Fig. 13 shows that the zero and line mode components of the fault point are independent of each other.
The initial traveling wave surge voltage of each mode at the fault point can be obtained from fig. 13:
in summary, through the analysis of the initial travelling wave modulus of the three fault types, the following can be concluded from equations (6), (10), (13): different fault types and different amplitudes of initial traveling wave surges of each mode generated at different fault points, wherein the amplitude of the traveling wave surge is also influenced by the size of the transition resistance of the fault point.
Based on the method, the computer equipment can use a preset mathematical tool to perform module component extraction processing on the signal to be detected, so as to obtain the line module component characteristics of the signal to be detected.
In this embodiment, due to different fault types, the amplitudes of the line mode signals generated at different fault points are different. Therefore, the computer equipment can realize the rapid positioning of the line fault by extracting the line mode component characteristics of the signal to be detected, and the accuracy of fault positioning is improved.
It should be understood that although the various steps in the flowcharts of fig. 2-3, 5-7 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 2-3 and 5-7 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or in alternation with other steps or at least some of the other steps.
In one embodiment, as shown in fig. 14, there is provided a fault location device comprising an acquisition module 10 and a determination module 20, wherein:
the acquisition module 10 is configured to input a detection pulse signal to a detection end of the ground electrode line, and receive a signal to be detected from the detection end; the detection end is one end of the grounding electrode circuit close to the rectifying side circuit, and the signal to be detected is a reflected signal generated by transmission of the detection pulse signal in the grounding electrode circuit;
the determining module 20 is configured to determine a signal characteristic of the signal to be detected, and perform fault location according to the signal characteristic of the signal to be detected and the reference information; the reference information includes signal characteristics of a plurality of fault signals and fault information.
In an embodiment, on the basis of the above embodiment, the determining module 20 is specifically configured to: determining a first signal characteristic matched with the signal characteristic of the signal to be detected in the reference information; determining a second signal characteristic matched with the signal characteristic of the signal to be detected in the actually measured reference information; and carrying out fault positioning according to first fault information corresponding to the first signal characteristic in the reference information and second fault information corresponding to the second signal characteristic in the actually measured reference signal.
In an embodiment, on the basis of the above embodiment, as shown in fig. 15, the fault location apparatus further includes an updating module 30, where the updating module 30 is configured to update the signal characteristic of the simulated fault signal of the simulated fault point and the fault information of the simulated fault point, corresponding to the test fault point, in the reference information according to the signal characteristic of the test fault signal in the measured reference information and the fault information of the test fault point.
In an embodiment, on the basis of the above embodiment, the determining module 20 is specifically configured to: determining signal characteristics matched with the signal characteristics of the signal to be detected in the reference information, and determining target fault information corresponding to the signal characteristics matched with the signal characteristics of the signal to be detected; and carrying out fault positioning based on the target fault information.
In an embodiment, on the basis of the above embodiment, the determining module 20 is specifically configured to: and performing modulus component extraction processing on the signal to be detected to obtain the linear modulus component characteristics of the signal to be detected.
For specific limitations of the fault location device, reference may be made to the above limitations of the fault location method, which are not described herein again. The modules in the fault location device can be wholly or partially implemented by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 16. The computer device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the computer device is used for storing reference information data. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program is executed by a processor to implement a fault localization method.
Those skilled in the art will appreciate that the architecture shown in fig. 16 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having a computer program stored therein, the processor implementing the following steps when executing the computer program:
inputting a detection pulse signal to a detection end of the grounding electrode circuit, and receiving a signal to be detected from the detection end; the detection end is one end of the grounding electrode circuit close to the converter station, and the signal to be detected is a reflected signal generated by transmission of the detection pulse signal in the grounding electrode circuit;
determining the signal characteristics of the signal to be detected, and performing fault positioning according to the signal characteristics of the signal to be detected and the reference information; the reference information includes signal characteristics of the plurality of fault signals and fault information.
In one embodiment, the processor, when executing the computer program, further performs the steps of: establishing a simulation circuit of the grounding electrode circuit according to the circuit parameters of the grounding electrode circuit; the line parameters comprise the impedance of the grounding electrode line and the length of the grounding electrode line; determining a plurality of simulation fault points of the simulation line to respond to a simulation fault signal of the detection pulse signal in a simulation environment; and respectively extracting signal characteristics of a plurality of simulated fault signals corresponding to the plurality of simulated fault points, and determining reference information according to the fault information of the plurality of simulated fault points and the result of the signal characteristic extraction.
In one embodiment, the processor, when executing the computer program, further performs the steps of: determining a plurality of test fault points of the grounding electrode line, responding to a test fault signal of the detection pulse signal; and respectively extracting signal characteristics of a plurality of test fault signals corresponding to the plurality of test fault points, and determining the actually measured reference information according to the fault information of the plurality of test fault points and the result of the signal characteristic extraction.
In one embodiment, the processor, when executing the computer program, further performs the steps of: determining a first signal characteristic matched with the signal characteristic of the signal to be detected in the reference information; determining a second signal characteristic matched with the signal characteristic of the signal to be detected in the actually measured reference information; and carrying out fault positioning according to first fault information corresponding to the first signal characteristic in the reference information and second fault information corresponding to the second signal characteristic in the actually measured reference signal.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and updating the signal characteristics of the simulated fault signal of the simulated fault point and the fault information of the simulated fault point, which correspond to the test fault point in the reference information, according to the signal characteristics of the test fault signal in the actually measured reference information and the fault information of the test fault point.
In one embodiment, the processor, when executing the computer program, further performs the steps of: determining signal characteristics matched with the signal characteristics of the signal to be detected in the reference information, and determining target fault information corresponding to the signal characteristics matched with the signal characteristics of the signal to be detected; and carrying out fault positioning based on the target fault information.
In one embodiment, the processor, when executing the computer program, further performs the steps of: and performing modulus component extraction processing on the signal to be detected to obtain the linear modulus component characteristics of the signal to be detected.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
inputting a detection pulse signal to a detection end of the grounding electrode circuit, and receiving a signal to be detected from the detection end; the detection end is one end of the grounding electrode circuit close to the converter station, and the signal to be detected is a reflected signal generated by transmission of the detection pulse signal in the grounding electrode circuit;
determining the signal characteristics of the signal to be detected, and performing fault positioning according to the signal characteristics of the signal to be detected and the reference information; the reference information includes signal characteristics of the plurality of fault signals and fault information.
In one embodiment, the computer program when executed by the processor further performs the steps of: establishing a simulation circuit of the grounding electrode circuit according to the circuit parameters of the grounding electrode circuit; the line parameters comprise the impedance of the grounding electrode line and the length of the grounding electrode line; determining a plurality of simulation fault points of the simulation line to respond to a simulation fault signal of the detection pulse signal in a simulation environment; and respectively extracting signal characteristics of a plurality of simulated fault signals corresponding to the plurality of simulated fault points, and determining reference information according to the fault information of the plurality of simulated fault points and the result of the signal characteristic extraction.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining a plurality of test fault points of the grounding electrode line, responding to a test fault signal of the detection pulse signal; and respectively extracting signal characteristics of a plurality of test fault signals corresponding to the plurality of test fault points, and determining the actually measured reference information according to the fault information of the plurality of test fault points and the result of the signal characteristic extraction.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining a first signal characteristic matched with the signal characteristic of the signal to be detected in the reference information; determining a second signal characteristic matched with the signal characteristic of the signal to be detected in the actually measured reference information; and carrying out fault positioning according to first fault information corresponding to the first signal characteristic in the reference information and second fault information corresponding to the second signal characteristic in the actually measured reference signal.
In one embodiment, the computer program when executed by the processor further performs the steps of: and updating the signal characteristics of the simulated fault signal of the simulated fault point and the fault information of the simulated fault point, which correspond to the test fault point in the reference information, according to the signal characteristics of the test fault signal in the actually measured reference information and the fault information of the test fault point.
In one embodiment, the computer program when executed by the processor further performs the steps of: determining signal characteristics matched with the signal characteristics of the signal to be detected in the reference information, and determining target fault information corresponding to the signal characteristics matched with the signal characteristics of the signal to be detected; and carrying out fault positioning based on the target fault information.
In one embodiment, the computer program when executed by the processor further performs the steps of: and performing modulus component extraction processing on the signal to be detected to obtain the linear modulus component characteristics of the signal to be detected.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A fault positioning method is applied to an earth electrode line in a direct current transmission system, the direct current transmission system comprises a converter station, a high-voltage direct current line and the earth electrode line, and the method is characterized by comprising the following steps:
inputting a detection pulse signal to a detection end of the grounding electrode circuit, and receiving a signal to be detected from the detection end; the detection end is the end, close to the converter station, of the grounding electrode line, and the signal to be detected is a reflected signal generated by transmission of the detection pulse signal in the grounding electrode line;
determining the signal characteristics of the signal to be detected, and performing fault location according to the signal characteristics of the signal to be detected and reference information; the reference information includes signal characteristics of a plurality of fault signals and fault information.
2. The method of claim 1, further comprising:
establishing a simulation circuit of the grounding electrode circuit according to the circuit parameters of the grounding electrode circuit; the line parameters comprise the impedance of the grounding electrode line and the length of the grounding electrode line;
determining a plurality of simulation fault points of the simulation line to respond to the simulation fault signal of the detection pulse signal under a simulation environment;
and respectively extracting signal characteristics of a plurality of simulated fault signals corresponding to the plurality of simulated fault points, and determining the reference information according to the fault information of the plurality of simulated fault points and the result of the signal characteristic extraction.
3. The method of claim 2, further comprising:
determining a plurality of test fault points of the grounding electrode line in response to a test fault signal of the detection pulse signal;
and respectively extracting signal characteristics of a plurality of test fault signals corresponding to the plurality of test fault points, and determining actual measurement reference information according to the fault information of the plurality of test fault points and the result of the signal characteristic extraction.
4. The method of claim 3, further comprising:
determining a first signal characteristic matched with the signal characteristic of the signal to be detected in the reference information;
determining a second signal characteristic matched with the signal characteristic of the signal to be detected in the actually measured reference information;
and carrying out fault positioning according to first fault information corresponding to the first signal characteristic in the reference information and second fault information corresponding to the second signal characteristic in the actually measured reference signal.
5. The method of claim 3, further comprising:
and updating the signal characteristics of the simulated fault signal of the simulated fault point and the fault information of the simulated fault point, which correspond to the test fault point in the reference information, according to the signal characteristics of the test fault signal and the fault information of the test fault point in the actually measured reference information.
6. The method according to claim 2 or 5, wherein the fault location according to the signal characteristics of the signal to be detected and the reference information comprises:
determining signal characteristics matched with the signal characteristics of the signal to be detected in the reference information, and determining target fault information corresponding to the signal characteristics matched with the signal characteristics of the signal to be detected;
and carrying out fault positioning based on the target fault information.
7. The method of claim 1, said determining a signal characteristic of said signal to be detected, comprising:
and performing modulus component extraction processing on the signal to be detected to obtain the linear modulus component characteristics of the signal to be detected.
8. A fault locating device, characterized in that the device comprises:
the acquisition module is used for inputting a detection pulse signal to a detection end of the grounding electrode circuit and receiving a signal to be detected from the detection end; the detection end is the end, close to the converter station, of the grounding electrode line, and the signal to be detected is a reflected signal generated by transmission of the detection pulse signal in the grounding electrode line;
the determining module is used for determining the signal characteristics of the signal to be detected and carrying out fault positioning according to the signal characteristics of the signal to be detected and the reference information; the reference information includes signal characteristics of a plurality of fault signals and fault information.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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