Power transmission line fault information fusion distance measurement system

Abstract

The invention discloses a power transmission line fault information fusion distance measurement system, relates to the technical field of power transmission lines, solves the problem that the original fault point distance measurement error is large, realizes high-precision and intelligent fault positioning through a multi-module cooperation and innovation algorithm, and has remarkable technical advantages and application value. The system is based on multi-module linkage of a time feature processing end, a feature recording end and the like, firstly uses time difference to lock a fault interval, then gradually reduces a positioning range in combination with traveling wave signal amplitude and frequency features, and finally accurately locks a line segment where a fault point is located. The process effectively avoids the limitation of a single distance measurement method, greatly reduces the fault positioning error, can remarkably reduce the troubleshooting time and workload of power operation and maintenance personnel, and improves the fault repair efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission lines, and specifically to a transmission line fault information fusion ranging system. Background Art

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

[0003] The application with the publication number CN118818221 B discloses a transmission line fault information fusion ranging system and method. The system includes: a signal monitoring and processing module 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 obtains the event sequence record of the transmission line circuit breaker in the substation and the substation line topology information; a fault traveling wave ranging module calculates at least one fault location result based on the event sequence record, the substation line topology information, the time-stamped zero-sequence voltage data, the voltage traveling wave recording data, the current traveling wave recording data, and the hardware traveling wave data; an information fusion ranging analysis module performs comprehensive ranging analysis on at least one fault location result of the fault traveling wave ranging module according to the actions and action lines of the event sequence record and the voltage level of the action line, and selects the accurate position of the real fault point from at least one fault location result, making the fault location more effective and accurate.

[0004] Traditional transmission line fault ranging methods, such as the impedance method, are easily affected by factors such as the system operation mode and transition resistance, and the ranging accuracy is relatively low; although the traveling wave method improves the ranging accuracy to a certain extent, it solely relies on traveling wave signals, and the signals are easily interfered in a complex electromagnetic environment, and it is difficult to cope with the errors caused by traveling wave refraction and reflection. With the continuous expansion of the power grid scale and the increasing complexity of the structure, the existing fault ranging technologies have been difficult to meet the requirements of high precision and rapid positioning. There is an urgent need for a transmission line fault information fusion ranging system that can fuse multi-source information, comprehensively consider various fault characteristics, and has strong anti-interference ability to improve the accuracy and reliability of fault location. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a transmission line fault information fusion ranging system, which solves the problem of large ranging errors at the original fault point.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: A transmission line fault information fusion ranging system includes:

[0007] The time feature processing terminal 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, the interval section where the fault point is located is locked. The specific method is as follows:

[0008] Based on the time parameters of the signals received by the substations on both sides, confirm the difference between the two sets of time parameters and determine the time difference;

[0009] Then use: V × time difference = distance difference to confirm the distance difference between the fault point and the two substations, where V is a preset value;

[0010] Then confirm the total length of the transmission line between the two substations. Based on the confirmed distance difference and the total length, lock the two points where the fault points are located. Then, from the two sets of time parameters, confirm the time parameter with the earlier order. Take the substation associated with this time parameter as the base station, and record the point where the fault point closest to the base station is located as the determined position of this fault point;

[0011] Based on the determined position of the fault point, translate X1m to the left and right, where X1 is a preset value, and determine the line interval section generated after translation;

[0012] The feature recording terminal records the determined line interval section, and based on the recorded line interval section, confirms the time features associated with the two substations. The specific method is as follows:

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

[0014] Use: JL1 k ÷V = T1 k and JL2 k ÷V = T2 k to confirm the time parameters T1 k and T2 k associated with the corresponding substation. Based on the two sets of confirmed time parameters T1 k and T2 k confirm the time line associated with the corresponding substation, take the confirmed time line as the time feature associated with the corresponding substation, and transmit the confirmed time feature to the time zone curve selection terminal;

[0015] The traveling wave feature verification terminal receives the transient traveling wave signals received by the two substations, and based on the amplitude representation of the corresponding signals, confirms the signal waveform associated with the corresponding signals. The specific method is as follows:

[0016] Based on the time parameters of the signals received by the two substations, with the corresponding time parameters as the initial moment, confirm the signal waveforms of the transient traveling wave signals received after the initial moment. The abscissa of the coordinate system where the corresponding signal waveforms are located is time, and the ordinate is amplitude;

[0017] Based on the different signal waveforms associated with different substations, mark the partial wave bands within the signal waveforms that exceed the amplitude interval. The amplitude interval is a preset interval, which is determined in advance by the operator according to experience. Denote the marked partial wave bands as abnormal amplitude segments;

[0018] At the selected end of the time zone curve, based on the time characteristics associated with different substations, confirm the waveform segments to be verified from the signal waveforms associated with different substations. The specific method is as follows:

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

[0020] From the signal waveforms associated with the corresponding substations, confirm the partial waveform segments associated with its time characteristics, and denote the associated partial waveform segments as the waveform segments to be verified;

[0021] At the frequency verification identification end, identify the abnormal amplitude segments marked inside from the waveform segments to be verified associated with the two substations. Based on the frequency characteristics associated with the corresponding peaks within the abnormal amplitude segments, conduct comprehensive verification to determine and lock the accurate position of the fault point. The specific method is as follows:

[0022] From the marked abnormal amplitude segments, determine the peak points. The trend of the partial wave band in front of the peak point is upward, and the trend of the partial wave band behind is downward. From the waveform segments to be verified, confirm the two sets of zero-value points with the closest time distance to the corresponding peak point. The zero-value points are the points where the amplitude is 0. Denote the two sets of confirmed zero-value points as the affiliated points associated with the corresponding peak point, and confirm the time difference TC between the two sets of zero-value points q , adopt: F q = 1÷TC q Confirm the frequency characteristic F associated with the corresponding peak point q , where q represents different peak points;

[0023] Adopt: D q =(1.5×10 6 )÷F q Confirm the distance characteristic D associated with the corresponding peak point q , and successively confirm the different distance characteristics D associated with different peak points in the two waveform segments to be verified q ;

[0024] Denote several groups of distance characteristics D associated with different waveform segments to be verified qCombine them to confirm the distance feature set belonging to 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 single-sum value T g , where g represents different summation processes;

[0025] Calibrate the total line length of the transmission line between the two substations as ZL, and use C g = |ZL - T g | to confirm the single difference C associated with the corresponding single-sum value g ;

[0026] Then, from the confirmed several single differences C g , select the minimum value C g min, and record the summation process associated with the minimum value C g min as the optimal process, and record the two sets of distance features D q associated with the optimal process as the standard distance;

[0027] Based on the standard distance determined for the corresponding substation, starting from the substation, lock the characteristic points in the transmission line, and record the part of the transmission line segment between the two locked characteristic points as the segment where the fault point is located, and directly display it.

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

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

[0030] Through multi-module collaboration and innovative algorithms, the present invention realizes high-precision and intelligent fault location, with significant technical advantages and application value; the system is based on the linkage of multiple modules such as the time feature processing end and the feature recording end. First, it uses the time difference to lock the fault interval, and then combines the amplitude and frequency characteristics of the traveling wave signal to gradually narrow the positioning range, and finally accurately locks the line segment where the fault point is located; this process effectively avoids the limitations of a single ranging method, greatly reduces the fault location error, can significantly reduce the troubleshooting time and workload of power maintenance personnel, and improve the fault repair efficiency;

[0031] During the ranging and positioning process of the fault point, it first preferentially uses the time difference to preliminarily confirm the corresponding line section, then determines the corresponding peak point based on the amplitude fluctuation characteristics of the corresponding signal waveform, and then re-confirms and locks the fault point based on the specific frequency and associated characteristics of the peak point. From the locked numerical characteristics, the position of the fault point is accurately locked, which is convenient for the actual maintenance process of relevant personnel in the future. Brief Description of the Drawings

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

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] First embodiment

[0035] Please refer to 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 identification end. Among them, the time feature processing end and the feature recording end are electrically connected in sequence from the output node to the input node, and the traveling wave feature verification end, the time zone curve selection end, and the frequency verification identification end are electrically connected in sequence from the output node to the input node, and the feature recording end is electrically connected to the input node of the time zone curve selection end;

[0036] Designated signal receivers are installed in the substations on both sides of the transmission line to receive the transient traveling wave signals generated in the transmission line, facilitating subsequent feature verification and confirmation;

[0037] Among them, the time feature processing end 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, the interval section where the fault point is located is locked. Among them, the propagation speed of the corresponding signal in the line is generally fixed and close to the speed of light. Therefore, in the actual test process, the specific location of the point section can be confirmed based on the corresponding time feature, facilitating subsequent feature locking and making the location of the corresponding fault point more accurate. The specific method for locking the interval section is as follows:

[0038] Based on the time parameters of the signals received by the substations on both sides, confirm the difference between the two sets of time parameters to determine the time difference;

[0039] Then use: V × time difference = distance difference to confirm the distance difference between the fault point and the substations on both sides, where V is a preset value, and its specific value is determined by the operator in advance according to experience;

[0040] Reconfirm the total length of the transmission line between the two substations. Based on the confirmed distance difference and the total length, lock the points where the two sets of fault points are located. Then, from the two sets of time parameters, confirm the time parameter ranked first. Take the substation associated with this time parameter as the base station, and mark the point where the fault point closest to the base station is located as the determined position of this fault point. Specifically, assume the distance length of the fault point from a single substation is L1, and the other distance length is L2, where L1 + L2 = total length, and |L1 - L2| = distance difference. Then, the corresponding accurate values of L1 and L2 can be confirmed. Generally, there are two sets of the confirmed values, that is, two fault points are confirmed. Then, for the corresponding fault points, the points closest in distance need to be confirmed, that is, the corresponding accurate positions are locked;

[0041] Based on the determined position of the fault point, translate X1m to the left and right. X1 is a preset value, and its specific value is determined by the operator according to experience, generally taking 30. Determine the line section generated after translation, and transmit the determined line section to the feature recording end for recording.

[0042] Among them, the feature recording end records the determined line section, and based on the recorded line section, confirms the time features associated with the two substations, and transmits the confirmed time features to the time zone curve selection end. The specific method for confirming the time features is as follows:

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

[0044] Adopt: JL1 k ÷V = T1 k and JL2 k ÷V = T2 k to confirm the time parameters T1 k and T2 k associated with the corresponding substation. Based on the two sets of confirmed time parameters T1 k and T2 k , confirm the time line associated with the corresponding substation, take the confirmed time line as the time feature associated with the corresponding substation, and transmit the confirmed time feature to the time zone curve selection end;

[0045] Specifically, each substation has a corresponding time feature, that is, a different time line. Subsequently, according to the corresponding time line, the corresponding waveform segment can be quickly found, which is convenient for feature verification of the associated partial wave bands, identifying the corresponding wave band features from them, so as to accurately find the position of the corresponding fault point.

[0046] Among them, the traveling wave feature verification end receives the transient traveling wave signals received by the two substations, and based on the amplitude representation of the corresponding signals, confirms the signal waveforms associated with the corresponding signals, and transmits the two confirmed signal waveforms to the time zone curve selection end. 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, with the corresponding time parameters as the initial moment, confirm the signal waveforms of the transient traveling wave signals received after the initial moment. The abscissa of the coordinate system where the corresponding signal waveforms are located is time, and the ordinate is amplitude;

[0048] Based on the different signal waveforms associated with different substations, mark the partial wave bands in the signal waveforms that exceed the amplitude range. The amplitude range is a preset range, which is determined in advance by the operator according to experience. Record the marked partial wave bands as abnormal amplitude segments. There are abnormal amplitude segments marked in both signal waveforms, which is convenient for subsequent direct comprehensive evaluation and analysis of abnormalities to determine the accurate location of the fault point.

[0049] Among them, the time zone curve selection end, based on the time characteristics associated with different substations, confirms the waveform segments to be verified from the signal waveforms associated with different substations, and transmits the two confirmed waveform segments to be verified to the frequency verification identification end. Specifically, the time characteristics associated with the waveform segments to be verified are the partial wave bands associated with the corresponding time lines, and the associated fault characteristics can be quickly identified from the corresponding partial wave bands. The specific method for confirming the waveform segments to be verified is as follows:

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

[0051] From the signal waveforms associated with the corresponding substations, confirm the partial waveform segments associated with the time characteristics, and record the associated partial waveform segments as the waveform segments to be verified (because the initial moments of the corresponding signal waveforms have been specifically calibrated, so according to the corresponding time characteristics, that is, the corresponding time lines, the corresponding waveform segments can be quickly locked, and the waveform segments to be verified that need to be feature-verified can be locked).

[0052] Among them, the frequency verification identification end identifies the abnormal amplitude segments calibrated inside from the waveform segments to be verified associated with the two substations, and based on the frequency characteristics associated with the corresponding peaks in the abnormal amplitude segments, conducts comprehensive verification and determination to lock the accurate location of the fault point. The specific method for locking is as follows:

[0053] From the calibrated abnormal amplitude segments, determine the peak points, where the front part of the wave segment of the peak point shows an upward trend and the back part shows a downward trend. From the waveform segments to be verified, confirm the two sets of zero-value points that are closest to the corresponding peak point in terms of time distance. The zero-value points are the points where the amplitude is 0. Take the two sets of confirmed zero-value points as the affiliated points associated with the corresponding peak point, and confirm the time difference TC between the two sets of zero-value points. q , adopt: F q = 1÷TC q Confirm the frequency feature F associated with the corresponding peak point. q , where q represents different peak points;

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

[0055] Combine several groups of distance features D associated with different waveform segments to be verified, confirm the distance feature set belonging to the corresponding waveform segment to be verified, randomly sum two groups of distance features D from the two distance feature sets. q Confirm the single-body sum value T. q , where g represents different summation processes; g ;

[0056] Calibrate the total line length of the transmission line between the two substations on both sides as ZL, and adopt C g =|ZL - T g | to confirm the single-body difference C associated with the corresponding single-body sum value. g ;

[0057] Then, from the confirmed several single-body differences C g , select the minimum value C g min. Denote the summation process associated with the minimum value C g min as the optimal process, and denote the two sets of distance features D associated with the optimal process. q as the standard distance;

[0058] Based on the standard distance determined for the corresponding substation, starting from the substation, lock the characteristic points in the transmission line. The distance between the characteristic points and the substation is the standard distance. Denote the part of the transmission line segment between the two locked characteristic points as the segment where the fault point is located, and directly display it for external personnel to view. The determined segment where the fault point is located is the accurate position of the corresponding fault point, which is convenient for point confirmation calibration and also convenient for the subsequent line maintenance work of maintenance personnel.

[0059] Some of the data in the above formula are numerically calculated after removing their dimensions, and the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0060] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical method 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 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 features associated with the substations on both sides; The traveling wave characteristic verification terminal receives the 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 representation of the corresponding signal; The selected end of the time zone curve is based on the time characteristics associated with different substations, and the waveform segment to be verified is confirmed from the signal waveforms associated with different substations; The frequency verification identification end identifies the abnormal amplitude segment calibrated inside the waveform segment to be verified associated with the two substations, and performs comprehensive verification and determination based on the frequency characteristics associated with the corresponding peak in the abnormal amplitude segment to lock the exact location of the fault point.

2. A transmission line fault information fusion ranging system according to claim 1, characterized in that: The specific method of the time feature processing end to lock the interval where the fault point is located is: Based on the time parameters of the signals received by the substations on both sides, the difference between the two sets of time parameters is confirmed to determine the time difference; Then use: V × time difference = distance difference to confirm that the fault point is located at the distance difference between the substations on both sides, where V is the preset value; Then confirm the total length of the transmission line between the substations on both sides, and based on the confirmed distance difference and total length, lock the locations of the two groups of fault points. Then, confirm the time parameter that is ranked first from the two groups of time parameters, and use the substation associated with this time parameter as the base station. The point of the fault point closest to the base station is recorded as the determined location of the fault point. Based on the determined position of the fault point, the line section generated after the translation is determined by shifting X1m to the left and right, where X1 is a preset value.

3. A transmission line fault information fusion ranging system according to claim 1, characterized in that: The specific method of confirming the time feature at the feature recording end is: Based on the recorded line section, confirm the two end points of this line section and record the distance values ​​JL1 of the two end points to a single substation k and JL2 k , where k represents different substations; Use: JL1 k ÷V=T1 k and JL2 k ÷V=T2 k Confirm the time parameter T1 associated with the corresponding strain station k and T2 k , based on the two confirmed time parameters T1 k and T2 k , confirm the time line associated with the corresponding strain station, use the confirmed time line as the time feature associated with the corresponding strain station, and transmit the confirmed time feature to the selected end of the time zone curve.

4. A transmission line fault information fusion ranging system according to claim 1, characterized in that: The specific method of determining the signal waveform at the traveling wave characteristic verification end is: Based on the time parameters of the signals received by the substations on both sides, the corresponding time parameters are used as the initial moment, and the signal waveform of the transient traveling wave signal subsequently received at the initial moment is confirmed, and the horizontal coordinate of the coordinate system of the corresponding signal waveform is time, and the vertical coordinate is amplitude; Based on the different signal waveforms associated with different substations, some bands in the signal waveform that exceed the amplitude range are marked. The amplitude range is a preset range, which is prepared in advance by the operator based on experience, and the marked bands are recorded as abnormal amplitude segments.

5. A 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: Based on the time characteristics associated with different substations and the associated signal waveforms; From the signal waveform associated with the corresponding strain station, a partial waveform segment associated with its time feature is identified, and the associated partial waveform segment is recorded as a waveform segment to be verified.

6. A transmission line fault information fusion ranging system according to claim 1, characterized in that: The specific method of locking the frequency feature associated with the corresponding peak value in the abnormal amplitude segment by the frequency verification identification end is: From the calibrated abnormal amplitude segment, determine the peak point, the front part of the peak point has an upward trend, and the back part of the peak point has a downward trend. From the waveform segment to be checked, confirm the two groups of zero-value points with the closest time distance to the corresponding peak point. The zero-value point is the point with an amplitude of 0. The two confirmed groups of zero-value points are used as the subsidiary points associated with the corresponding peak point, and the time difference TC between the two groups of zero-value points is confirmed. q , using: F q =1÷TC q Confirm the frequency feature F associated with the corresponding peak point q , where q represents different peak points.

7. A transmission line fault information fusion ranging system according to claim 6, characterized in that: The specific method of the frequency verification identification end to lock the accurate position of the fault point is: Use: D q =(1.5×10 6 )÷F q Confirm the distance feature D associated with the corresponding peak point q , for different distance features D associated with different peak points in the two waveform segments to be verified q Confirm in turn; The distance features D associated with different waveform segments to be verified are q Combine and confirm the distance feature set that belongs to the corresponding waveform segment to be verified, and randomly select two sets of distance feature D from the two sets of distance feature sets. q Perform random summation to confirm the monomer summation value T g , where g represents different summation processes; The total length of the transmission line between the substations on both sides is calibrated as ZL, and C g =|ZL-T g |Confirm the monomer difference C associated with the corresponding monomer sum value g ; Then from the confirmed monomer difference C g In the above example, select the minimum value C g min, the minimum value C g The summation process associated with min is recorded as the best process, and the two sets of distance features D associated with the best process are recorded as q Recorded as standard distance; Based on the standard distance determined for the corresponding substation, starting from the substation, the characteristic points in the transmission line are locked, and the partial transmission line section between the two locked sets of characteristic points is recorded as the section where the fault point is located and displayed directly.

8. A transmission line fault information fusion ranging system according to claim 7, characterized in that: The distance between the characteristic point and the substation is the standard distance.

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