A power transmission line fault information fusion ranging system

Abstract

The application discloses a power transmission line fault information fusion ranging system and relates to the technical field of power transmission lines, solves the problem of large ranging error of an original fault point, and realizes high-precision and intelligent fault positioning through multi-module cooperation and innovative algorithms, so that the application has significant technical advantages and application value; the system is based on linkage of multiple modules such as a time feature processing end and a feature recording end, firstly locks a fault interval by using a time difference, then gradually reduces a positioning range by combining a traveling wave signal amplitude and a frequency feature, and finally accurately locks a line section where a fault point is located; this process effectively avoids the limitation of a single ranging method, greatly reduces fault positioning error, can significantly reduce the checking time and workload of power operation and maintenance personnel, and improves fault repair efficiency.

Description

Technical Field

[0001] This invention relates to the field of power transmission line technology, specifically to a power transmission line fault information fusion ranging system. Background Technology

[0002] In the field of power transmission, transmission lines are a key component of the power system, and their safe and stable operation is of paramount importance. Once a transmission line fails, quickly and accurately locating the fault point is crucial for minimizing power outage time, reducing economic losses, and ensuring a reliable power supply.

[0003] Application CN118818221 B discloses a transmission line fault information fusion ranging system and method. The system includes: a signal monitoring and processing module that monitors and obtains time-stamped hardware traveling wave data, voltage traveling wave recording data, current traveling wave recording data, and zero-sequence voltage data; an information sharing interface module that acquires the event sequence records of the transmission line circuit breakers in the substation and the substation line topology information; a fault traveling wave ranging module that calculates at least one fault location result based on the event sequence records, the substation line topology information, the time-stamped zero-sequence voltage data, voltage traveling wave recording data, current traveling wave recording data, and hardware traveling wave data; and an information fusion ranging analysis module that performs comprehensive ranging analysis on at least one fault location result from the fault traveling wave ranging module based on the action and the acting line of the event sequence records, and the voltage level of the acting line, and extracts the precise location of the actual fault point from at least one fault location result, making fault location more effective and accurate.

[0004] Traditional methods for fault location in transmission lines, such as impedance methods, are susceptible to factors such as system operating conditions and transition resistance, resulting in low accuracy. While traveling wave methods improve accuracy to some extent, they rely solely on traveling wave signals, making them vulnerable to interference in complex electromagnetic environments and unable to handle errors caused by refraction and reflection. With the continuous expansion and increasing complexity of power grids, existing fault location technologies are insufficient to meet the demands for high precision and rapid location. There is an urgent need for a transmission line fault information fusion location system that can integrate multi-source information, comprehensively consider various fault characteristics, and possess strong anti-interference capabilities to improve the accuracy and reliability of fault location. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a transmission line fault information fusion ranging system, which solves the problem of large ranging errors in the original fault point.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a transmission line fault information fusion ranging system, comprising:

[0007] The time feature processing unit confirms the time parameters of the signals received by the substations on both sides of the fault point. Based on the time difference between the two sides, it locates the interval where the fault point is located. The specific method is as follows:

[0008] Based on the time parameters of the signals received by the two substations, the difference between the two sets of time parameters is confirmed, and the time difference is determined.

[0009] Then, the distance difference between the two substations is confirmed by using the formula: V × time difference = distance difference, where V is a preset value;

[0010] Next, confirm the bus length of the transmission line between the two substations. Based on the confirmed distance difference and bus length, locate the two sets of fault points. Then, from the two sets of time parameters, confirm the time parameter that is ranked first. Use the substation associated with this time parameter as the base station and record the location of the fault point closest to the base station as the determined location of this fault point.

[0011] Based on the determined location of the fault point, shift it to the left and right by X1m, where X1 is a preset value, and determine the resulting line section after the shift.

[0012] The feature recording end records the determined line section and, based on the recorded line section, confirms the time characteristics associated with the substations on both sides. Specifically, the method is as follows:

[0013] Based on the recorded line section, identify the two endpoints of this line section and record the distance JL1 from each endpoint to a single substation. k and JL2 k , where k represents different substations;

[0014] JL1 was adopted. k ÷V=T1 k and JL2 k ÷V=T2 k Confirm that the time parameter T1 belongs to the strain gauge power station k and T2 k Based on the two confirmed sets of time parameters T1 k and T2 k Confirm the timeline associated with the strain gauge power station, use the confirmed timeline as the time feature associated with the strain gauge power station, and transmit the confirmed time feature to the selected end of the time zone curve.

[0015] The traveling wave characteristic verification terminal receives transient traveling wave signals from both substations and, based on the amplitude characterization of the corresponding signals, confirms the associated signal waveform. Specifically:

[0016] Based on the time parameters of the signals received by the two substations, the waveform of the transient traveling wave signal received after the initial time is confirmed using the corresponding time parameters as the initial time. The horizontal axis of the coordinate system where the corresponding signal waveform is located is time, and the vertical axis is amplitude.

[0017] Based on the different signal waveforms associated with different substations, the portion of the signal waveform that exceeds the amplitude range is marked. The amplitude range is a preset range, which is determined in advance by the operator based on experience. The marked portion of the waveform is recorded as an abnormal amplitude segment.

[0018] The time zone curve selection endpoint is determined by identifying the waveform segment to be verified from the signal waveforms associated with different substations, based on the time characteristics associated with those substations. The specific method is as follows:

[0019] Based on the time characteristics and associated signal waveforms of different substations;

[0020] From the signal waveforms associated with the strain gauge power station, identify the waveform segments associated with its time characteristics, and record the associated waveform segments as the waveform segments to be verified.

[0021] The frequency verification identifier identifies the marked abnormal amplitude segments within the waveform segments to be verified associated with the two substations. Based on the frequency characteristics associated with the corresponding peak values ​​within the abnormal amplitude segments, a comprehensive verification is performed to pinpoint the exact location of the fault. The specific method is as follows:

[0022] From the identified abnormal amplitude ranges, determine the peak point. The wave trend before the peak point is upward, and the wave trend after the peak point is downward. From the waveform segment to be verified, identify the two sets of zero-value points that are closest in time to the corresponding peak point. These zero-value points are the points with an amplitude of 0. Use the two identified sets of zero-value points as the associated points of the corresponding peak point, and confirm the time difference TC between the two sets of zero-value points. q Using: F q =1÷TC q Identify the frequency characteristic F associated with the corresponding peak point q , where q represents different peak points;

[0023] Adopted: D q = (1.5 × 10 6 )÷F q Confirm the distance feature D associated with the corresponding peak point. q The different distance features D associated with different peak points in the two waveform segments to be verified q Confirm in sequence;

[0024] Several sets of distance features D belonging to different waveform segments to be verified are associated with each other. qCombine the features to confirm that they belong to the distance feature set of the corresponding waveform segment to be verified, and randomly select two sets of distance features D from the two sets of distance feature sets. q Perform random summation to confirm the summation value T of each individual unit. g , where g represents different summation processes;

[0025] The confirmed bus length of the transmission line between the two substations is designated as ZL, and C is used. g =|ZL-T g |Confirm the monomer difference C associated with the summation value of the corresponding monomer. g ;

[0026] Then, from the confirmed differences C of several monomers g In the middle, select the minimum value C. g min, the minimum value C g The summation process associated with min is denoted as the optimal process, and the two sets of distance features D associated with the optimal process are... q Recorded as standard distance;

[0027] Based on the standard distance determined by the corresponding power station, starting from the substation, the characteristic points within the transmission line are locked, and the section of the transmission line between the two locked sets of characteristic points is recorded as the section where the fault point is located and directly displayed.

[0028] Preferably, the distance between the feature point and the substation is a standard distance.

[0029] This invention provides a transmission line fault information fusion ranging system. Compared with the prior art, it has the following advantages:

[0030] This invention achieves high-precision and intelligent fault location through multi-module collaboration and innovative algorithms, exhibiting significant technical advantages and application value. The system is based on the coordinated operation of multiple modules, including a time feature processing unit and a feature recording unit. It first uses time difference to pinpoint the fault zone, then combines the amplitude and frequency characteristics of the traveling wave signal to gradually narrow the location range, ultimately accurately locating the fault point on the corresponding line segment. This process effectively avoids the limitations of a single ranging method, significantly reducing fault location errors and substantially decreasing the troubleshooting time and workload for power maintenance personnel, thereby improving fault repair efficiency.

[0031] During the ranging and location process, the fault point is first identified by the time difference. Then, based on the amplitude fluctuation characteristics of the corresponding signal waveform, the corresponding peak point is determined. Subsequently, based on the specific frequency and correlation characteristics of the peak point, the fault point is reconfirmed and locked. From the locked numerical characteristics, the fault point location is accurately locked, which facilitates the subsequent maintenance process of relevant personnel. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the principle framework of the present invention. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] First Embodiment

[0035] Please see Figure 1 This application provides a transmission line fault information fusion ranging system, including a time feature processing end, a feature recording end, a traveling wave feature verification end, a time zone curve selection end, and a frequency verification mark end. The time feature processing end and the feature recording end are electrically connected from the output node to the input node in sequence, and the traveling wave feature verification end, the time zone curve selection end, and the frequency verification mark end are electrically connected from the output node to the input node in sequence. The feature recording end is electrically connected to the input node of the time zone curve selection end.

[0036] Both substations on both sides of the transmission line are equipped with designated signal receivers to receive transient traveling wave signals generated within the transmission line, facilitating subsequent feature verification and confirmation.

[0037] The time feature processing unit confirms the time parameters of the signals received by the substations on both sides of the fault point. Based on the time difference between the two sides, it locks down the section where the fault point is located. Since the speed at which the corresponding signal propagates in the line is generally fixed, close to the speed of light, in actual testing, the specific location section can be confirmed based on the corresponding time features, facilitating subsequent feature locking and making the location of the corresponding fault point more accurate. The specific method for section locking is as follows:

[0038] Based on the time parameters of the signals received by the two substations, the difference between the two sets of time parameters is confirmed, and the time difference is determined.

[0039] Then, the distance difference between the two substations is confirmed by using the formula: V × time difference = distance difference. Here, V is a preset value, and its specific value is determined in advance by the operator based on experience.

[0040] Next, confirm the bus length of the transmission line between the two substations. Based on the confirmed distance difference and bus length, locate the two sets of fault points. Then, from the two sets of time parameters, confirm the time parameter that comes first. Take the substation associated with this time parameter as the base station. Record the location of the fault point closest to the base station as the determined location of this fault point. Specifically, determine the distance length from the fault point to a single substation as L1 and the other distance length as L2, where L1+L2 = bus length and |L1-L2| = distance difference. Then, the corresponding accurate values ​​L1 and L2 can be confirmed. There are generally two sets of confirmed values, that is, two fault points are confirmed. Then, the corresponding fault point needs to be confirmed as the closest point, that is, the corresponding accurate location is locked.

[0041] Based on the determined location of the fault point, the line is shifted X1m to the left and right. X1 is a preset value, and its specific value is determined by the operator based on experience, generally 30. The resulting line segment after the shift is determined and transmitted to the feature recording terminal for recording.

[0042] The feature recording end records the determined line segment and, based on the recorded line segment, confirms the time characteristics associated with the substations on both sides. The confirmed time characteristics are then transmitted to the time zone curve selection end. The specific method for confirming the time characteristics is as follows:

[0043] Based on the recorded line section, identify the two endpoints of this line section and record the distance JL1 from each endpoint to a single substation. k and JL2 k , where k represents different substations;

[0044] JL1 was adopted. k ÷V=T1 k and JL2 k ÷V=T2 k Confirm that the time parameter T1 belongs to the strain gauge power station k and T2 k Based on the two confirmed sets of time parameters T1 k and T2 k Confirm the timeline associated with the strain gauge power station, use the confirmed timeline as the time feature associated with the strain gauge power station, and transmit the confirmed time feature to the selected end of the time zone curve.

[0045] Specifically, each substation has its own time characteristics, which are different timelines. Based on the corresponding timelines, the corresponding waveform segments can be quickly found, making it convenient to perform feature verification on the associated partial bands and identify the corresponding band characteristics, thereby accurately locating the corresponding fault point.

[0046] The traveling wave characteristic verification terminal receives transient traveling wave signals from both substations and, based on the amplitude characterization of the corresponding signals, confirms the associated signal waveforms. It then transmits the two confirmed signal waveforms to the time zone curve selection terminal. The specific method for determining the signal waveforms is as follows:

[0047] Based on the time parameters of the signals received by the two substations, the waveform of the transient traveling wave signal received after the initial time is confirmed using the corresponding time parameters as the initial time. The horizontal axis of the coordinate system where the corresponding signal waveform is located is time, and the vertical axis is amplitude.

[0048] Based on the different signal waveforms associated with different substations, the portion of the signal waveform that exceeds the amplitude range is marked. The amplitude range is a preset range, which is determined in advance by the operator based on experience. The marked portion of the waveform is recorded as an abnormal amplitude segment. The marked abnormal amplitude segment exists in both signal waveforms, which facilitates the subsequent comprehensive evaluation and analysis of the anomaly and determines the accurate location of the fault point.

[0049] The time zone curve selection end, based on the time characteristics associated with different substations, identifies the waveform segments to be verified from the signal waveforms associated with different substations, and transmits the two sets of verified waveform segments to the frequency verification identifier end. Specifically, the time characteristics associated with the waveform segments to be verified are the corresponding part of the waveband associated with the time line, and the associated fault characteristics can be quickly identified directly from the corresponding part of the waveband. The specific method for confirming the waveform segments to be verified is as follows:

[0050] Based on the time characteristics and associated signal waveforms of different substations;

[0051] From the signal waveforms associated with the strain gauge power station, identify the waveform segments associated with their time characteristics, and record the associated waveform segments as the waveform segments to be verified (because the initial time of the corresponding signal waveform has been specifically calibrated, the corresponding waveform segment can be quickly locked based on the corresponding time characteristics, that is, the corresponding time line, and thus the waveform segment to be verified that needs to be verified can be locked).

[0052] The frequency verification identifier identifies the abnormal amplitude segments within the waveform segments to be verified associated with the two substations. Based on the frequency characteristics associated with the corresponding peak values ​​within the abnormal amplitude segments, a comprehensive verification is performed to pinpoint the exact location of the fault. The specific method for pinpointing the fault is as follows:

[0053] From the identified abnormal amplitude ranges, determine the peak point. The wave trend before the peak point is upward, and the wave trend after the peak point is downward. From the waveform segment to be verified, identify the two sets of zero-value points that are closest in time to the corresponding peak point. These zero-value points are the points with an amplitude of 0. Use the two identified sets of zero-value points as the associated points of the corresponding peak point, and confirm the time difference TC between the two sets of zero-value points. q Using: F q =1÷TC q Identify the frequency characteristic F associated with the corresponding peak point q , where q represents different peak points;

[0054] Then use: D q = (1.5 × 10 6 )÷F q Confirm the distance feature D associated with the corresponding peak point. q The different distance features D associated with different peak points in the two waveform segments to be verified q Confirm in sequence;

[0055] Several sets of distance features D belonging to different waveform segments to be verified are associated with each other. q Combine the features to confirm that they belong to the distance feature set of the corresponding waveform segment to be verified, and randomly select two sets of distance features D from the two sets of distance feature sets. q Perform random summation to confirm the summation value T of each individual unit. g , where g represents different summation processes;

[0056] The confirmed bus length of the transmission line between the two substations is designated as ZL, and C is used. g =|ZL-T g |Confirm the monomer difference C associated with the summation value of the corresponding monomer. g ;

[0057] Then, from the confirmed differences C of several monomers g In the middle, select the minimum value C. g min, the minimum value C g The summation process associated with min is denoted as the optimal process, and the two sets of distance features D associated with the optimal process are... q Recorded as standard distance;

[0058] Based on the standard distance determined by the substation, starting from the substation, characteristic points within the transmission line are locked. The distance between these characteristic points and the substation is the standard distance. The section of the transmission line between the two locked sets of characteristic points is recorded as the section where the fault point is located and directly displayed for external personnel to view. The determined section where the fault point is located is the accurate location of the corresponding fault point, which facilitates point confirmation and marking, and also facilitates subsequent line maintenance work by maintenance personnel.

[0059] Some of the data in the above formulas are numerical calculations with dimensions removed, and the contents not described in detail in this specification are all prior art known to those skilled in the art.

[0060] The above embodiments are only used to illustrate the technical methods of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical methods of the present invention without departing from the spirit and scope of the technical methods of the present invention.

Claims

1. A transmission line fault information fusion ranging system, characterized in that, include: The time feature processing end confirms the time parameters of the signals received by the substations on both sides of the fault point, and locks down the section where the fault point is located based on the time difference between the two sides. The feature recording end records the determined line section and, based on the recorded line section, confirms the time characteristics associated with the substations on both sides. The traveling wave characteristic verification terminal receives transient traveling wave signals received by the substations on both sides and confirms the signal waveform associated with the corresponding signal based on the amplitude characterization of the corresponding signal. The time zone curve is selected based on the time characteristics associated with different substations, and the waveform segment to be verified is identified from the signal waveforms associated with different substations. The frequency verification identifier identifies the marked abnormal amplitude segments within the waveform segments to be verified associated with the two substations. Based on the frequency characteristics associated with the corresponding peak values ​​within the abnormal amplitude segments, a comprehensive verification is performed to pinpoint the exact location of the fault. The specific method is as follows: From the identified abnormal amplitude ranges, determine the peak point. The wave trend before the peak point is upward, and the wave trend after the peak point is downward. From the waveform segment to be verified, identify the two sets of zero-value points that are closest in time to the corresponding peak point. These zero-value points are the points with an amplitude of 0. Use the two identified sets of zero-value points as the associated points of the corresponding peak point, and confirm the time difference TC between the two sets of zero-value points. q , using: F q =1÷TC q Identify the frequency characteristic F associated with the corresponding peak point q , where q represents different peak points; The specific method for pinpointing the exact location of the fault is as follows: Adopted: D q = (1.5 × 10 6 )÷F q Confirm the distance feature D associated with the corresponding peak point. q The different distance features D associated with different peak points in the two waveform segments to be verified q Confirm in sequence; Several sets of distance features D belonging to different waveform segments to be verified are associated with each other. q Combine the features to confirm that they belong to the distance feature set of the corresponding waveform segment to be verified, and randomly select two sets of distance features D from the two sets of distance feature sets. q Perform random summation to confirm the summation value T of each individual unit. g , where g represents different summation processes; The confirmed bus length of the transmission line between the two substations is designated as ZL, and C is used. g =|ZL-T g |Confirm the monomer difference C associated with the summation value of the corresponding monomer. g ; Then, from the confirmed differences C of several monomers g In the middle, select the minimum value C. g min, the minimum value C g The summation process associated with min is denoted as the optimal process, and the two sets of distance features D associated with the optimal process are... q Recorded as standard distance; Based on the standard distance determined by the corresponding power station, starting from the substation, the characteristic points within the transmission line are locked, and the section of the transmission line between the two locked sets of characteristic points is recorded as the section where the fault point is located and directly displayed.

2. The transmission line fault information fusion ranging system according to claim 1, characterized in that, The specific method by which the time feature processing terminal locates the interval where the fault point is located is as follows: Based on the time parameters of the signals received by the two substations, the difference between the two sets of time parameters is confirmed, and the time difference is determined. Then, the distance difference between the two substations is confirmed by using the formula: V × time difference = distance difference, where V is a preset value; Next, confirm the bus length of the transmission line between the two substations. Based on the confirmed distance difference and bus length, locate the two sets of fault points. Then, from the two sets of time parameters, confirm the time parameter that is ranked first. Use the substation associated with this time parameter as the base station and record the location of the fault point closest to the base station as the determined location of this fault point. Based on the determined location of the fault point, the line is shifted X1m to the left and right, where X1 is a preset value, and the resulting line segment is determined.

3. The transmission line fault information fusion ranging system according to claim 1, characterized in that, The specific method for confirming time features at the feature recording terminal is as follows: Based on the recorded line section, identify the two endpoints of this line section and record the distance JL1 from each endpoint to a single substation. k and JL2 k , where k represents different substations; JL1 was adopted. k ÷V=T1 k and JL2 k ÷V=T2 k Confirm that the time parameter T1 belongs to the strain gauge power station k and T2 k Based on the two confirmed sets of time parameters T1 k and T2 k The timeline associated with the strain gauge power station is confirmed, and the confirmed timeline is used as the time feature associated with the strain gauge power station. The confirmed time feature is then transmitted to the selected end of the time zone curve.

4. The transmission line fault information fusion ranging system according to claim 1, characterized in that, The traveling wave feature verification terminal determines the signal waveform in the following specific way: Based on the time parameters of the signals received by the two substations, the waveform of the transient traveling wave signal received after the initial time is confirmed using the corresponding time parameters as the initial time. The horizontal axis of the coordinate system where the corresponding signal waveform is located is time, and the vertical axis is amplitude. Based on the different signal waveforms associated with different substations, the portion of the signal waveform that exceeds the amplitude range is marked. The amplitude range is a preset range, which is determined in advance by the operator based on experience. The marked portion of the waveform is recorded as an abnormal amplitude segment.

5. The transmission line fault information fusion ranging system according to claim 1, characterized in that, The specific method for confirming the waveform segment to be checked at the selected end of the time zone curve is as follows: Based on the time characteristics and associated signal waveforms of different substations; From the signal waveforms associated with the strain gauge power station, identify the waveform segments associated with its time characteristics, and record the associated waveform segments as the waveform segments to be verified.

6. The transmission line fault information fusion ranging system according to claim 1, characterized in that, The distance between the feature point and the substation is the standard distance.

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