Power transmission line fault side and lightning stroke side identification method and device, computer device and storage medium

Abstract

This application relates to a method, apparatus, computer equipment, and storage medium for identifying the fault side and lightning strike side of a transmission line. The method includes: acquiring a first current traveling wave signal from a first monitoring point and a second current traveling wave signal from a second monitoring point of the transmission line; performing phase-mode transformation on the first and second current traveling wave signals respectively to obtain a first line-mode component and a second line-mode component; performing signal amplification processing on the first and second line-mode components respectively to obtain a target first line-mode component and a target second line-mode component; determining a first extreme time difference of the target first line-mode component and a second extreme time difference of the target second line-mode component; and identifying the fault side and lightning strike side from the first and second monitoring points based on the first and second extreme time differences. This method helps improve the accuracy of fault location in transmission lines.

Description

Technical Field

[0001] This application relates to the field of power transmission line technology, and in particular to a method, apparatus, computer equipment, and storage medium for identifying the fault side and lightning strike side of a power transmission line. Background Technology

[0002] Overhead transmission lines are long, widely distributed, and traverse complex and variable geographical environments, making them highly susceptible to lightning strikes. When a lightning strike occurs, the lightning strike point may not flashover. The traveling wave of the lightning current propagates along the line for a certain distance before flashover occurs at a weak point in the insulation. In this case, the lightning strike point and the fault point are usually at least one span apart, which greatly affects the reliability of existing traveling wave distance measurement methods.

[0003] Currently, fault location devices based on the traveling wave method are widely used in transmission lines. Among them, the double-ended traveling wave method is widely integrated into traveling wave ranging systems due to its smaller error and the fact that it does not require identification of subsequent traveling wave reflection wavefronts. However, when a lightning strike occurs on a transmission line, because the nearest tower to the lightning strike point has good insulation, no flashover occurs at that point. The lightning current traveling wave then propagates along the line. When it reaches a weak point in the insulation, a flashover occurs. At this time, if the lightning strike side and the fault side are not distinguished, the existing double-ended traveling wave ranging method cannot accurately locate the fault point where the flashover occurred, thus affecting the accuracy of fault location on transmission lines. Summary of the Invention

[0004] Therefore, it is necessary to provide a method, device, computer equipment, computer-readable storage medium, and computer program product for identifying the fault side and lightning strike side of transmission lines, which can improve the accuracy of fault location in transmission lines, in response to the above-mentioned technical problems.

[0005] In a first aspect, this application provides a method for identifying the fault side and lightning strike side of a transmission line, including:

[0006] Acquire the first current traveling wave signal at the first monitoring point and the second current traveling wave signal at the second monitoring point of the transmission line.

[0007] The first current traveling wave signal and the second current traveling wave signal are respectively subjected to phase mode transformation to obtain the first line mode component and the second line mode component;

[0008] The first linear mode component and the second linear mode component are amplified and processed respectively to obtain the first linear mode component and the second linear mode component of the target.

[0009] Determine the first extreme time difference of the first linear modulus component of the target and the second extreme time difference of the second linear modulus component of the target;

[0010] Based on the time difference between the first and second extreme values, the fault side and the lightning strike side are identified from the first and second monitoring points.

[0011] Secondly, this application also provides a transmission line fault side and lightning strike side identification device, comprising:

[0012] The signal acquisition module is used to acquire the first current traveling wave signal at the first monitoring point and the second current traveling wave signal at the second monitoring point of the transmission line.

[0013] The phase-mode conversion module is used to perform phase-mode conversion on the first current traveling wave signal and the second current traveling wave signal respectively to obtain the first line mode component and the second line mode component.

[0014] The signal amplification module is used to amplify the first linear mode component and the second linear mode component respectively to obtain the target first linear mode component and the target second linear mode component.

[0015] The time difference determination module is used to determine the first extreme time difference of the first linear mode component of the target and the second extreme time difference of the first linear mode component of the target.

[0016] The fault-side and lightning-side discrimination module is used to identify the fault side and the lightning-side from the first monitoring point and the second monitoring point based on the first extreme time difference and the second extreme time difference.

[0017] Thirdly, this application also provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in any of the above embodiments of the transmission line fault side and lightning strike side identification methods.

[0018] Fourthly, this application also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps in any of the above embodiments of the transmission line fault side and lightning strike side identification methods.

[0019] Fifthly, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps in any of the above embodiments of the transmission line fault side and lightning strike side identification methods.

[0020] The aforementioned method, apparatus, computer equipment, computer-readable storage medium, and computer program product for identifying fault-side and lightning-side transmission lines first acquire a first current traveling wave signal at a first monitoring point and a second current traveling wave signal at a second monitoring point of the transmission line. Second, they perform phase-mode conversion on the first and second current traveling wave signals respectively to convert the electrical quantities of the current signal from the phase coordinate system to the mode coordinate system, thereby decoupling the electromagnetic coupling between the three phases and improving the accuracy of fault location. Third, by amplifying the first and second line-mode components respectively, they amplify the degree of signal distortion, thereby amplifying the characteristics of lightning strikes and faults in the current signal to obtain the target signal. The first line-mode component and the target second line-mode component; finally, to address the problem in related technologies that fail to distinguish between the lightning strike side and the fault side, making it difficult to locate fault points other than lightning strike points using traveling wave ranging methods, this paper, based on the different time differences between the lightning strike distortion signal on the lightning strike side and the fault distortion signal on the fault side, identifies the fault side and the lightning strike side from the first monitoring point and the second monitoring point based on the first extreme time difference of the target first line-mode component and the second extreme time difference of the target second line-mode component. On the one hand, this improves the accuracy of fault side and lightning strike side discrimination; on the other hand, it facilitates further locating fault points other than lightning strike points based on the distinguished lightning strike side and fault side, thereby improving the accuracy and reliability of transmission line fault location. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an application environment diagram of a method for identifying the fault side and lightning strike side of a transmission line in one embodiment;

[0023] Figure 2 This is a flowchart illustrating a method for identifying the fault side and lightning strike side of a transmission line in one embodiment;

[0024] Figure 3 This is a flowchart illustrating the method for identifying the fault side and lightning strike side of a transmission line in another embodiment;

[0025] Figure 4 This is a flowchart illustrating the method for identifying the fault side and lightning strike side of a transmission line in another embodiment;

[0026] Figure 5 This is a flowchart illustrating the method for identifying the fault side and lightning strike side of a transmission line in another embodiment;

[0027] Figure 6 This is a flowchart illustrating the method for identifying the fault side and lightning strike side of a transmission line in another detailed embodiment;

[0028] Figure 7 This is a schematic diagram of the lightning strike point and fault point of a transmission line in one embodiment;

[0029] Figure 8 This is a schematic diagram of the first linear mode component in one embodiment;

[0030] Figure 9 This is a schematic diagram of the second linear mode component in one embodiment;

[0031] Figure 10 This is a schematic diagram of the target first linear mode component in one embodiment;

[0032] Figure 11 This is a schematic diagram of the target second linear mode component in one embodiment;

[0033] Figure 12 This is a structural block diagram of a transmission line fault side and lightning strike side identification device in one embodiment;

[0034] Figure 13 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0036] The transmission line fault side and lightning strike side identification method provided in this application embodiment can be applied to, for example... Figure 1 In the application environment shown, the control terminal 102 is connected to the first monitoring point 104 and the second monitoring point 106.

[0037] Specifically, the first monitoring point 104 can transmit the first current traveling wave signal of the transmission line to the control terminal 102, and the second monitoring point 106 can transmit the second current traveling wave signal of the transmission line to the control terminal 102. The control terminal 102 can acquire the first current traveling wave signal of the first monitoring point and the second current traveling wave signal of the second monitoring point. Then, the first current traveling wave signal and the second current traveling wave signal are subjected to phase mode transformation to obtain the first line mode component and the second line mode component, respectively. Then, the first line mode component and the second line mode component are subjected to signal amplification processing to obtain the target first line mode component and the target second line mode component. Finally, the first extreme value time difference of the target first line mode component and the second extreme value time difference of the target second line mode component are determined. Based on the first extreme value time difference and the second extreme value time difference, the fault side and the lightning strike side are identified from the first monitoring point and the second monitoring point.

[0038] The control terminal 102 can be, but is not limited to, an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services.

[0039] In one exemplary embodiment, such as Figure 2 As shown, a method for identifying the fault side and lightning strike side of a transmission line is provided, and this method is applied to... Figure 1 Taking control terminal 102 as an example, the explanation includes the following steps (hereinafter referred to as S): S100 to S500. Wherein:

[0040] S100, acquire the first current traveling wave signal of the first monitoring point and the second current traveling wave signal of the second monitoring point of the transmission line.

[0041] In practical applications, a monitoring point can be set up on both sides of the transmission line (such as substations on both sides), and a current traveling wave signal monitoring terminal can be deployed at each monitoring point. The location of the monitoring points is determined according to the actual monitoring requirements.

[0042] In practice, monitoring terminals for traveling current signals are deployed at substation M (the first monitoring point) and substation N (the second monitoring point) along the transmission line to monitor the traveling current signals in the transmission line. The high-frequency first traveling current signal I caused by lightning strikes is extracted from the monitoring terminal at the first monitoring point. M (t), correspondingly, the high-frequency second current traveling wave signal I caused by the lightning strike is extracted from the monitoring terminal of the second monitoring point. N (t).

[0043] S200 performs phase-mode transformation on the first current traveling wave signal and the second current traveling wave signal respectively to obtain the first line mode component and the second line mode component.

[0044] Phase-mode transformation is used to mathematically decompose transient traveling wave signals (such as voltage or current) in a three-phase power system into multiple independent modulus components. This decouples the electromagnetic coupling between the three phases, thereby enabling more effective analysis of the traveling wave propagation characteristics and fault location. Phase-mode transformation methods can include, but are not limited to, Kelvin transform, symmetrical component method, and Clark transform.

[0045] For example, the Clark transform can be used to transform the first current traveling wave signal I. M (t) Perform phase-mode transformation to obtain the first linear mode component I of the first current traveling wave signal. M1 (t). Correspondingly, the Clark transform is used to transform the second current traveling wave signal I. N (t) Perform phase-mode transformation to obtain the second linear mode component I of the second current traveling wave signal. N1 (t).

[0046] S300, the first linear mode component and the second linear mode component are amplified and processed respectively to obtain the first linear mode component and the second linear mode component of the target.

[0047] Signal amplification processing methods include, but are not limited to, wavelet transform and wavelet packet transform.

[0048] For example, it could be the first linear mode component I M1 (t) Perform wavelet transform to amplify the distortion of the first current traveling wave signal, and obtain the amplified target first linear mode component I`. M1 (t), correspondingly, for the second linear mode component I N1 (t) Perform wavelet transform to amplify the distortion of the second current traveling wave signal, and obtain the target second linear mode component I` after the method. N1 (t).

[0049] S400, determine the first extreme time difference of the first linear mode component of the target and the second extreme time difference of the second linear mode component of the target.

[0050] The first extreme time difference can be characterized on the M side, from the "reflection wavefront" to the "main lightning wavefront". The second extreme time difference can be characterized on the N side, from the "reflection wavefront" to the "main lightning wavefront".

[0051] In practice, for the first extreme time difference, the time t at which the maximum value occurs can be identified from the first linear modulus component using the maximum value method. M1 Correspondingly, the time t when the maximum value appears in the second linear modulus component is identified using the maximum value method. N1 Subsequently, based on the polarity of the maximum value, the time t at which the maximum value occurs can be found from the first linear modulus component.M2 Find the time t when the maximum value occurs from the second linear modulus component. N2 According to t M1 and t M2 The difference between them yields the time difference of the first extreme value. Similarly, based on t N1 and t N2 The difference between them yields the second extreme time difference.

[0052] S500 identifies the fault side and the lightning strike side from the first monitoring point and the second monitoring point based on the first extreme time difference and the second extreme time difference.

[0053] In practice, the monitoring points corresponding to the fault side and the lightning strike side can be determined by comparing the magnitude of the first extreme time difference and the second extreme time difference. Understandably, the lightning strike side represents the monitoring point closer to the lightning strike point on the transmission line, while the fault side represents the monitoring point closer to the fault point (such as the flashover point) on the transmission line that is not struck by lightning.

[0054] In the aforementioned method for identifying the fault side and lightning strike side of a transmission line, firstly, the first current traveling wave signal at the first monitoring point and the second current traveling wave signal at the second monitoring point of the transmission line are acquired; secondly, phase-mode conversion is performed on the first and second current traveling wave signals respectively to convert the electrical quantities of the current signal from the phase coordinate system to the mode coordinate system, thereby decoupling the electromagnetic coupling between the three phases and improving the accuracy of fault location; thirdly, by amplifying the first and second line-mode components respectively, the distortion of the signal is amplified, thereby amplifying the characteristics of lightning strikes and faults in the current signal, and obtaining the target first line-mode component and the target second line-mode component. Finally, to address the issue that related technologies fail to distinguish between the lightning strike side and the fault side, making it difficult to locate non-lightning strike fault points using traveling wave ranging methods, this paper addresses the problem of different time differences between the lightning strike distortion signal on the lightning strike side and the fault distortion signal on the fault side. Based on the time difference between the first extreme value of the first line-mode component and the second extreme value of the second line-mode component, the fault side and the lightning strike side are identified from the first and second monitoring points. This improves the accuracy of fault side and lightning strike side identification and facilitates further location of non-lightning strike fault points based on the distinguished lightning strike side and fault side, thus enhancing the accuracy and reliability of transmission line fault location.

[0055] In one exemplary embodiment, such as Figure 3 As shown, the first extreme time difference of the first linear mode component of the target and the second extreme time difference of the second linear mode component of the target are determined, including S402 to S406. Wherein:

[0056] S402, the time corresponding to the absolute value of the extreme value of the first linear mode component of the target is determined as the first extreme value time, and the time corresponding to the absolute value of the extreme value of the second linear mode component of the target is determined as the second extreme value time.

[0057] Among them, the first extreme moment and the second extreme moment represent the earliest time when the initial traveling wave generated by the lightning strike arrives at the first monitoring point and the second monitoring point, respectively.

[0058] In practice, the absolute value of the first linear modulus component of the target is taken, and the time t corresponding to the largest absolute value is selected. M1 Correspondingly, the absolute value of the second linear modulus component of the target is taken, and the time t corresponding to the largest absolute value is selected. N1 .

[0059] S404, determine the time difference of the first extreme value based on the first extreme value time and the first linear modulus component of the target.

[0060] In practice, the moment reflected back from the fault point or the monitoring point on the other side to the current monitoring point can be identified from the second linear mode component of the target. The polarity of the reflected wave is opposite to that of the incident wave. Then, the difference between the time corresponding to the traveling wave and the first extreme time is calculated to obtain the first extreme time difference.

[0061] S406, Determine the time difference of the second extreme value based on the second extreme value time and the target second linear modulus component.

[0062] In specific implementation, the steps for determining the first extreme time difference in the above embodiments shall be referred to here.

[0063] In this embodiment, determining the first extreme time difference and the second extreme time difference through the maximum value is beneficial to improving the reliability of fault point location.

[0064] In an exemplary embodiment, phase-mode transformation is performed on the first current traveling wave signal and the second current traveling wave signal to obtain a first line mode component and a second line mode component, including steps S201 to S202, wherein:

[0065] S201, perform Kalenberg transformation on the first current traveling wave signal to obtain the zero-mode component, the first-mode component and the second-mode component of the first current traveling wave signal, and determine the first-mode component as the first linear mode component.

[0066] S202, perform Kalenberg transformation on the second current traveling wave signal to obtain the zero-mode component, the first-mode component and the second-mode component of the second current traveling wave signal, and determine the first-mode component as the second linear mode component.

[0067] The Kalenberg transform is used to decouple power signals into independent modal components. These decoupled modal components include linear modal components and zero-mode components. The linear modal components include first-mode and second-mode components.

[0068] In practice, the first current traveling wave signal and the second current traveling wave signal are subjected to Kalenberg transforms respectively, as follows:

[0069]

[0070] Among them, I a I b I c These represent the three-phase currents flowing through the three-phase line; I1 is the first-order component. The zero modulus component, It is a 2-modulus component.

[0071] After performing Kalenberg transforms on the first and second current traveling wave signals respectively, a one-mode component I is extracted from the line-mode component of the decoupled first current traveling wave signal. M1 (t) is taken as the first linear mode component. Correspondingly, a first-mode component I is extracted from the linear mode components of the decoupled second current traveling wave signal. N1 (t) is the second linear modulus component.

[0072] In this embodiment, the three-phase current is decoupled by Kalenberg transformation, and the linear modulus component used for fault location is extracted, which helps to improve the accuracy of fault location.

[0073] In an exemplary embodiment, the first linear mode component and the second linear mode component are respectively subjected to signal amplification processing to obtain the target first linear mode component and the target second linear mode component, including S301 to S302, wherein:

[0074] S301, differentiate with respect to the first linear mode component to obtain the target first linear mode component.

[0075] S302, differentiate with respect to the second linear modulus component to obtain the target second linear modulus component.

[0076] High-frequency transient traveling waves are generated during faults or lightning strikes, which manifest as "singularities" in the signal. The amplitude changes of the original signal may be masked by noise, while its derivative waveform will show obvious maxima or zero crossings at the moment the wavefront arrives. By taking the derivative, these transient features can be amplified, improving the accuracy of wavefront identification.

[0077] In specific implementation, following the above steps, the first linear module component I... M1 Differentiating (t) yields I` M1 (t), taking the derivative of the second linear modulus component, we get I` N1 (t):

[0078] I` M1 (t)=dI M1(t) / dt

[0079] I` N1 (t)=dI N1 (t) / dt

[0080] In other embodiments, the first linear mode component and the second linear mode component can be numerically differentiated (e.g., by difference, wavelet differentiation, or by filtering and differentiation) to obtain the target first linear mode component and the target second linear mode component.

[0081] In this embodiment, by differentiating the first linear mode component and the second linear mode component, the distortion of the signal is amplified, and the characteristics of the abrupt change point (i.e., the traveling wave front) in the signal are enhanced, making it easier to detect, thereby improving the accuracy of fault location.

[0082] In one exemplary embodiment, such as Figure 4 As shown, the time difference between the first extreme value and the first linear modulus component of the target is determined, including S441 to S443. Wherein:

[0083] S441, determine the signal polarity corresponding to the first extreme moment.

[0084] S442, find the third extreme moment from the first linear mode component of the target. The third extreme moment is the moment corresponding to the extreme value of the first linear mode component of the target and is opposite to the polarity of the signal.

[0085] S443, the time difference between the first extreme moment and the third extreme moment is determined as the first extreme moment time difference.

[0086] In practice, signal polarity includes positive and negative polarity. The signal polarity of the extreme value at the first extreme moment is determined. After determining the signal polarity, the maximum value can be determined first from the target's first linear mode component. Then, for the target's first linear mode component before the moment corresponding to the maximum value, the moment corresponding to the largest maximum value with the opposite signal polarity determined in the above steps is found, and this moment is determined as the third extreme moment t. M2 The first extreme time t M1 and the third extreme time t M2 The time difference between them is determined as the first extreme time difference Δt. M .

[0087] In this embodiment, the extreme time difference is determined by signal polarity and the maximum value method, which helps to improve the accuracy of fault location.

[0088] In one exemplary embodiment, such as Figure 5 As shown, the time difference between the second extreme values ​​is determined based on the second extreme value time and the target second linear modulus component, including S461 to S463. Wherein:

[0089] S461, determine the signal polarity corresponding to the second extreme moment.

[0090] S462, find the fourth extreme moment from the second linear mode component of the target. The fourth extreme moment is the moment corresponding to the extreme value of the second linear mode component of the target and is opposite to the polarity of the signal.

[0091] S463, the time difference between the second extreme moment and the fourth extreme moment is defined as the second extreme moment time difference.

[0092] In practice, signal polarity includes positive and negative polarity, and the signal polarity of the extreme value at the second extreme value time is determined. After determining the signal polarity, the maximum value can be determined first from the target second linear mode component. Then, for the target second linear mode component before the time corresponding to the maximum value, the time corresponding to the maximum value with the opposite signal polarity determined in the above steps is found, and this time is determined as the fourth extreme value time t. N2 The second extreme time t N1 and the fourth extreme time t N2 The time difference between them is determined as the second extreme time difference Δt. N .

[0093] In this embodiment,

[0094] In one exemplary embodiment, such as Figure 6 As shown, based on the first extreme time difference and the second extreme time difference, the fault side and the lightning strike side are identified from the first monitoring point and the second monitoring point, including S501 to S502, wherein:

[0095] S501, if the time difference of the first extreme value is less than the time difference of the second extreme value, then the first monitoring point is determined as the fault side and the second monitoring point is determined as the lightning strike side.

[0096] In practical implementation, following the example above, after determining the time difference Δt at the first extreme value... M The time difference Δt between the second extreme value N Then, the lightning strike side and the fault side can be distinguished by comparison. Specifically, the time difference Δt at the first extreme value can be used... M The time difference Δt between the second extreme value N Comparison, if Δt M <Δt NIf the lightning strike side is the location of the first monitoring point, and the fault side is the location of the second monitoring point, then the lightning strike side and the fault side are determined. After identifying the lightning strike side and the fault side, since the lightning strike point and the fault point do not coincide, the traveling wave forms waveform oscillation characteristics through multiple reflections between the lightning strike point and the fault point. The period and amplitude of these oscillations are directly related to the distance between the lightning strike point and the flashover point. By analyzing these characteristics, the flashover point can be accurately located. In other embodiments, the fault point can also be determined based on the two-end traveling wave ranging method.

[0097] S502, if the time difference of the first extreme value is greater than the time difference of the second extreme value, then the second monitoring point is determined as the fault side and the first monitoring point is determined as the lightning strike side.

[0098] In practical implementation, following the example above, the time difference Δt at the first extreme value is... M The time difference Δt between the second extreme value N Comparison, if Δt M >Δt N If the lightning strike side is the side where the second monitoring point is located, then the fault side is the side where the first monitoring point is located. After identifying the lightning strike side and the fault side, the fault point can be determined using the two-end traveling wave ranging method.

[0099] In this embodiment, the lightning strike side and the fault side are distinguished based on the relationship between the first extreme time difference and the second extreme time difference. This helps to differentiate between situations where there is no lightning flashover and situations where there is a lightning flashover. Furthermore, it helps to locate the fault point based on the judgment result, which improves the accuracy of fault point location.

[0100] In other embodiments, where the lightning strike point is not the fault point, such as Figure 7 As shown, assuming a lightning strike occurs at point c on the transmission line between substations M and N, and a fault (such as a flashover) occurs at point f, after identifying the fault side and the lightning strike side from the first and second monitoring points, the process includes: acquiring the traveling wave signal of the lightning strike side; using the traveling wave ranging method to determine the location of the lightning strike point c; then calculating the time difference between the first traveling wave (from the lightning strike point c) and the traveling wave reflected back from the fault point f; and calculating the distance from the lightning strike point c to the fault point f based on the product of this time difference and the traveling wave velocity. Finally, based on the location of point c and the distance from c to f, the location of the fault point f is determined. Specifically, the location of the fault point f can be the location of point c plus the distance from c to f.

[0101] To provide a clearer explanation of the method for identifying the fault side and lightning strike side of transmission lines provided in this application, a specific embodiment is described below, which includes the following steps:

[0102] S1, acquire the first current traveling wave signal at the first monitoring point and the second current traveling wave signal at the second monitoring point of the transmission line.

[0103] S2, perform a Kalenberg transformation on the first current traveling wave signal to obtain the zero-mode component, the first-mode component, and the second-mode component of the first current traveling wave signal. The first-mode component is determined as the first line-mode component. Perform a Kalenberg transformation on the second current traveling wave signal to obtain the zero-mode component, the first-mode component, and the second-mode component of the second current traveling wave signal. The first-mode component is determined as the second line-mode component.

[0104] S3, differentiate with respect to the first linear modulus component to obtain the target first linear modulus component, differentiate with respect to the second linear modulus component to obtain the target second linear modulus component.

[0105] S4, the time corresponding to the absolute value of the extreme value of the first linear modulus component of the target is determined as the first extreme value time, and the time corresponding to the absolute value of the extreme value of the second linear modulus component of the target is determined as the second extreme value time.

[0106] S5, determine the signal polarity corresponding to the first extreme moment, find the third extreme moment from the target first linear mode component, the third extreme moment is the moment corresponding to the extreme value of the target first linear mode component and opposite to the signal polarity, and determine the time difference between the first extreme moment and the third extreme moment as the first extreme moment time difference.

[0107] S6, determine the signal polarity corresponding to the second extreme moment, find the fourth extreme moment from the target second linear mode component, the fourth extreme moment is the moment corresponding to the extreme value of the target second linear mode component and opposite to the signal polarity, and determine the time difference between the second extreme moment and the fourth extreme moment as the second extreme moment time difference.

[0108] S7. If the time difference of the first extreme value is less than the time difference of the second extreme value, then the first monitoring point is determined as the fault side and the second monitoring point is determined as the lightning strike side. If the time difference of the first extreme value is greater than the time difference of the second extreme value, then the second monitoring point is determined as the fault side and the first monitoring point is determined as the lightning strike side.

[0109] For example, a monitoring device is deployed at substation M (the first monitoring point), and correspondingly, a monitoring device is deployed at substation N (the second monitoring point). Figure 7 As shown, assuming a lightning strike occurs at point c on the transmission line between substation M and substation N, and a fault (such as flashover) occurs at point f, the first current traveling wave signal and the second current traveling wave signal are obtained by the monitoring device.

[0110] Subsequently, Kallenbo transforms were performed on the first and second current traveling wave signals respectively to extract the first and second line-mode components, as follows: Figure 8 and Figure 9 As shown.

[0111] Specifically, by differentiating the first linear mode component and the second linear mode component respectively, the target first linear mode component and the target second linear mode component are obtained, as follows: Figure 10 and Figure 11 As shown.

[0112] It can be seen that the time t is the time when the absolute value of M is the maximum. M1 For 1105 sampling points, the time t with the maximum absolute value on the N-side is... N1 For 1326 sampling points, t M2 For 1087 sampling points, t N2 With 891 sampling points, we can obtain t M1 and t M2 Time difference Δt M For 18 sampling points, t N1 and t N2 Time difference Δt N With 435 sampling points, it can be determined that the lightning strike side is the N side and the flashover side is the M side.

[0113] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0114] In one exemplary embodiment, such as Figure 12 As shown, a fault-side and lightning-side identification device 600 for transmission lines is provided, comprising: a signal acquisition module 610, a phase-mode conversion module 620, a signal amplification module 630, a time difference determination module 640, and a fault-side and lightning-side discrimination module 650, wherein:

[0115] The signal acquisition module 610 is used to acquire the first current traveling wave signal at the first monitoring point and the second current traveling wave signal at the second monitoring point of the transmission line.

[0116] The phase mode conversion module 620 is used to perform phase mode conversion on the first current traveling wave signal and the second current traveling wave signal respectively to obtain the first line mode component and the second line mode component.

[0117] The signal amplification module 630 is used to amplify the first linear mode component and the second linear mode component respectively to obtain the target first linear mode component and the target second linear mode component.

[0118] The time difference determination module 640 is used to determine the first extreme time difference of the first linear mode component of the target and the second extreme time difference of the first linear mode component of the target.

[0119] The fault-side and lightning-side discrimination module 650 is used to identify the fault side and the lightning-side from the first monitoring point and the second monitoring point based on the first extreme time difference and the second extreme time difference.

[0120] In an exemplary embodiment, the time difference determination module 640 is further configured to determine the time corresponding to the extreme absolute value of the target first linear mode component as the first extreme time, and determine the time corresponding to the extreme absolute value of the target second linear mode component as the second extreme time; determine the first extreme time difference based on the first extreme time and the target first linear mode component; and determine the second extreme time difference based on the second extreme time and the target second linear mode component.

[0121] In an exemplary embodiment, the time difference determination module 640 is further configured to determine the signal polarity corresponding to the first extreme moment; find the third extreme moment from the target first linear mode component, the third extreme moment being the moment corresponding to the extreme value of the target first linear mode component and opposite to the signal polarity; and determine the time difference between the first extreme moment and the third extreme moment as the first extreme moment time difference.

[0122] In an exemplary embodiment, the time difference determination module 640 is further configured to determine the signal polarity corresponding to the second extreme moment; find the fourth extreme moment from the target second linear mode component, the fourth extreme moment being the moment corresponding to the extreme value of the target second linear mode component and opposite to the signal polarity; and determine the time difference between the second extreme moment and the fourth extreme moment as the second extreme moment time difference.

[0123] In an exemplary embodiment, the fault-side lightning strike-side discrimination module 650 is further configured to determine the first monitoring point as the fault side and the second monitoring point as the lightning strike side if the first extreme time difference is less than the second extreme time difference; and to determine the second monitoring point as the fault side and the first monitoring point as the lightning strike side if the first extreme time difference is greater than the second extreme time difference.

[0124] In an exemplary embodiment, the phase-mode transformation module 620 is further configured to perform a Kalenberg transformation on the first current traveling wave signal to obtain the zero-mode component, the first-mode component, and the second-mode component of the first current traveling wave signal, and to determine the first-mode component as the first line-mode component; and to perform a Kalenberg transformation on the second current traveling wave signal to obtain the zero-mode component, the first-mode component, and the second-mode component of the second current traveling wave signal, and to determine the first-mode component as the second line-mode component.

[0125] In an exemplary embodiment, the signal amplification module 630 is further configured to differentiate the first linear mode component to obtain a target first linear mode component; and differentiate the second linear mode component to obtain a target second linear mode component.

[0126] Each module in the aforementioned transmission line fault side and lightning strike side identification device 600 can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0127] In one exemplary embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 13 As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The database stores data. The I / O interfaces are used for exchanging information between the processor and external devices. The communication interface is used for communicating with external terminals via a network. When executed by the processor, the computer program implements a method for identifying fault sides and lightning strike sides of power transmission lines.

[0128] Those skilled in the art will understand that Figure 13 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0129] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps in any of the above embodiments of the transmission line fault side and lightning strike side identification method.

[0130] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the steps in any of the above embodiments of the transmission line fault side and lightning strike side identification methods.

[0131] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps in any of the above embodiments of the transmission line fault side and lightning strike side identification methods.

[0132] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data must comply with relevant regulations.

[0133] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. 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). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0134] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0135] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A method for identifying the fault side and lightning strike side of a transmission line, characterized in that, The method includes: Acquire the first current traveling wave signal at the first monitoring point and the second current traveling wave signal at the second monitoring point of the transmission line. The first current traveling wave signal and the second current traveling wave signal are respectively subjected to phase mode transformation to obtain the first line mode component and the second line mode component; The first linear mode component and the second linear mode component are respectively amplified to obtain the target first linear mode component and the target second linear mode component; Determine the first extreme time difference of the first linear mode component of the target and the second extreme time difference of the second linear mode component of the target; Based on the first extreme time difference and the second extreme time difference, the fault side and the lightning strike side are identified from the first monitoring point and the second monitoring point.

2. The method according to claim 1, characterized in that, The step of determining the first extreme time difference of the target first linear mode component and the second extreme time difference of the target second linear mode component includes: The time corresponding to the absolute value of the extreme value of the first linear mode component of the target is determined as the first extreme value time, and the time corresponding to the absolute value of the extreme value of the second linear mode component of the target is determined as the second extreme value time. The first extreme time difference is determined based on the first extreme time and the first linear mode component of the target. The second extreme time difference is determined based on the second extreme time and the target second linear mode component.

3. The method according to claim 2, characterized in that, The step of determining the first extreme time difference based on the first extreme time and the target first linear mode component includes: Determine the signal polarity corresponding to the first extreme moment; Find the third extreme moment from the first linear mode component of the target, where the third extreme moment is the moment corresponding to the extreme value of the first linear mode component of the target and is opposite to the polarity of the signal; The time difference between the first extreme moment and the third extreme moment is defined as the first extreme moment difference.

4. The method according to claim 2, characterized in that, The step of determining the second extreme time difference based on the second extreme time and the target second linear mode component includes: Determine the signal polarity corresponding to the second extreme moment; Find the fourth extreme moment from the target second linear mode component. The fourth extreme moment is the moment corresponding to the extreme value of the target second linear mode component and is opposite to the polarity of the signal. The time difference between the second extreme moment and the fourth extreme moment is defined as the second extreme moment difference.

5. The method according to any one of claims 2 to 4, characterized in that, The step of identifying the fault side and the lightning strike side from the first monitoring point and the second monitoring point based on the first extreme time difference and the second extreme time difference includes: If the time difference between the first extreme values ​​is less than the time difference between the second extreme values, then the first monitoring point is determined to be the fault side and the second monitoring point is determined to be the lightning strike side. If the time difference between the first extreme values ​​is greater than the time difference between the second extreme values, then the second monitoring point is determined as the fault side, and the first monitoring point is determined as the lightning strike side.

6. The method according to claim 1, characterized in that, The step of performing phase-mode transformation on the first current traveling wave signal and the second current traveling wave signal respectively to obtain the first line mode component and the second line mode component includes: Perform a Kalenberg transformation on the first current traveling wave signal to obtain the zero-mode component, the first-mode component, and the second-mode component of the first current traveling wave signal, and determine the first-mode component as the first line-mode component. Perform a Kalenberg transform on the second current traveling wave signal to obtain the zero-mode component, the first-mode component, and the second-mode component of the second current traveling wave signal, and determine the first-mode component as the second linear mode component.

7. The method according to claim 1, characterized in that, The step of performing signal amplification processing on the first linear mode component and the second linear mode component respectively to obtain the target first linear mode component and the target second linear mode component includes: Differentiating the first linear mode component yields the target first linear mode component; Differentiating the second linear mode component yields the target second linear mode component.

8. A device for identifying the fault side and lightning strike side of a power transmission line, characterized in that, The device includes: The signal acquisition module is used to acquire the first current traveling wave signal at the first monitoring point and the second current traveling wave signal at the second monitoring point of the transmission line. The phase-mode conversion module is used to perform phase-mode conversion on the first current traveling wave signal and the second current traveling wave signal respectively to obtain the first line mode component and the second line mode component; The signal amplification module is used to amplify the first line-mode component and the second line-mode component respectively to obtain the target first line-mode component and the target second line-mode component. A time difference determination module is used to determine the first extreme time difference of the target first linear mode component and the second extreme time difference of the target first linear mode component; The fault-side and lightning-side discrimination module is used to identify the fault side and the lightning-side from the first monitoring point and the second monitoring point based on the first extreme time difference and the second extreme time difference.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 7.

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