Power grid fault positioning method, device and equipment and storage medium

Abstract

The invention discloses a power grid fault positioning method, device and equipment and a storage medium, and the method comprises the steps: taking the position of a traveling wave device in a power distribution network as an end point, dividing the structure of the power distribution network into a plurality of traveling wave sections, and calculating the time difference range of each traveling wave section; judging whether the power distribution network has a fault according to the real-time power distribution data of the primary and secondary fusion switches, and if so, determining a fault section according to the real-time power distribution data; obtaining a traveling wave time difference value of the fault section according to traveling wave signals captured by traveling wave devices at two ends of the fault section; if the traveling wave time difference value of the fault section is within the time difference range, determining that a single fault point exists, and determining the position of the fault point according to the traveling wave time difference value of the fault section; and if the traveling wave time difference value of the fault section is not within the time difference range, determining that a plurality of fault points exist, and cooperatively checking the traveling wave section step by step by cooperating with a primary fusion switch and a secondary fusion switch to obtain positions of all the fault points. According to the invention, multi-fault-point positioning can be carried out, and the accuracy of fault positioning is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of distribution network relay protection, and in particular to a power grid fault locating method, device, equipment and storage medium. Background Art

[0002] With the advancement of smart grid construction, distribution networks are expanding in scale and becoming increasingly complex. Traditional fault location methods face multiple technical bottlenecks in complex distribution network scenarios. Currently, distribution network fault location primarily relies on methods such as overcurrent protection, impedance analysis, and traveling wave analysis. The traveling wave method leverages the propagation characteristics of high-frequency transient signals generated by faults to achieve location accuracy, theoretically achieving hundreds of meters. However, in practice, it is susceptible to the complex topology of the distribution network, uneven line parameters, and traveling wave signal attenuation and reflection. Accurately capturing the initial fault wavehead is difficult, and only a single fault point can be located. Furthermore, the location results are susceptible to noise interference, resulting in low fault location accuracy. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a power grid fault location method, device, equipment and storage medium, which can locate multiple fault points and improve the accuracy of fault location.

[0004] An embodiment of the present invention provides a power grid fault location method, including:

[0005] Obtain real-time power distribution data of primary and secondary fusion switches in the distribution network and the location of traveling wave devices;

[0006] The distribution network structure is divided into several routes with the location of the traveling wave device as an endpoint to obtain several traveling wave segments; the time difference range of each traveling wave segment is calculated based on the location of the traveling wave device and the distribution network structure; wherein the time difference range is the range of traveling wave time difference values ​​corresponding to a fault point when the fault point exists in the traveling wave segment;

[0007] Determining whether a fault occurs in the distribution network based on the real-time power distribution data, and if a fault occurs, determining the faulty section from the traveling wave sections based on the real-time power distribution data; obtaining a traveling wave time difference value of the faulty section based on traveling wave signals captured by traveling wave devices at both ends of the faulty section;

[0008] If the traveling wave time difference value of the fault section is within the time difference range of the corresponding traveling wave section, it is determined that a single fault point exists, and the location of the fault point is determined according to the traveling wave time difference value of the fault section;

[0009] If the traveling wave time difference value of the fault section is not within the time difference range of the corresponding traveling wave section, it is determined that there are multiple fault points, and the traveling wave sections are checked step by step in coordination with the primary and secondary fusion switches to obtain the locations of all fault points.

[0010] As an improvement to the above solution, the time difference range of each traveling wave segment is calculated according to the location of the traveling wave device and the distribution network structure, including:

[0011] According to the position of the traveling wave device and the distribution network structure, all areas passed by the traveling wave during propagation in each traveling wave segment are determined to obtain the traveling wave propagation path of each traveling wave segment;

[0012] Determining a deceleration point and a corresponding deceleration coefficient for traveling wave propagation in the traveling wave propagation path according to the traveling wave characteristics and the traveling wave propagation path; the deceleration point and the deceleration coefficient are used to correct the propagation speed of the traveling wave;

[0013] The time difference range of each traveling wave segment is calculated based on the traveling wave propagation path, the deceleration point and the deceleration coefficient.

[0014] As an improvement to the above solution, after obtaining the plurality of traveling wave segments, the method further includes:

[0015] Determining the distribution affiliation between the traveling wave sections according to the distribution network structure;

[0016] The traveling wave segments are graded according to the power distribution affiliation to obtain a segment grade of each traveling wave segment.

[0017] As an improvement to the above solution, determining the fault section from the traveling wave section based on the real-time power distribution data includes:

[0018] performing abnormal data detection on the real-time power distribution data, and when abnormal data is detected in the real-time power distribution data, marking a traveling wave section where the primary and secondary fusion switch corresponding to the abnormal data is located as an abnormal section;

[0019] The abnormal segment with the highest segment level is determined as the fault segment.

[0020] As an improvement to the above solution, the step-by-step checking of the traveling wave sections by coordinating the primary and secondary fusion switches includes:

[0021] Determine the detection order of the abnormal sections according to the order of the section levels from high to low, and check the fault points in the abnormal sections step by step according to the detection order;

[0022] Among them, when detecting each abnormal section, the primary and secondary fusion switch is controlled to disconnect the traveling wave section with a section level lower than the current detection section, and then the traveling wave time difference value of the current detection section is calculated; the traveling wave time difference value of the current detection section is error-corrected according to the location of the known fault point to obtain the corrected traveling wave time difference value; and the fault point detection is performed on the current detection section according to the corrected traveling wave time difference value.

[0023] As an improvement to the above solution, the error correction of the traveling wave time difference value of the current detection section according to the location of the known fault point to obtain the corrected traveling wave time difference value includes:

[0024] According to the location and traveling wave characteristics of the known fault points, all fault points that affect the traveling wave time difference value of the current detection section are marked as impact points;

[0025] Calculating the time difference of the traveling wave generated by the influencing point on the current detection section to obtain an error value;

[0026] The traveling wave time difference value of the current detection section is corrected according to the error value to obtain a corrected traveling wave time difference value.

[0027] As an improvement to the above solution, the method of obtaining real-time power distribution data of the primary and secondary fusion switches in the distribution network and the location of the traveling wave device includes:

[0028] Deploy primary and secondary integrated switches based on the distribution network structure and grid operation requirements;

[0029] Acquire power distribution information and switch status information of the primary and secondary fusion switch in real time to obtain real-time power distribution data;

[0030] Acquire the traveling wave propagation velocity and the traveling wave effective range from the equipment information of the traveling wave device to obtain the traveling wave characteristics;

[0031] The deployment position of the traveling wave device is determined according to the traveling wave characteristics and the deployment status of the primary and secondary fusion switches.

[0032] An embodiment of the present invention further provides a power grid fault location device, comprising:

[0033] Data acquisition module, used to obtain real-time power distribution data of primary and secondary fusion switches in the distribution network and the location of traveling wave devices;

[0034] A segment division module is configured to divide the distribution network structure into a plurality of routes with the location of the traveling wave device as an endpoint, thereby obtaining a plurality of traveling wave segments; and calculate the time difference range of each traveling wave segment based on the location of the traveling wave device and the distribution network structure; wherein the time difference range is the range of traveling wave time difference values ​​corresponding to a fault point when the fault point exists in the traveling wave segment;

[0035] a fault section identification module, configured to determine whether a fault has occurred in the distribution network based on the real-time power distribution data; if a fault has occurred, to determine the fault section from the traveling wave sections based on the real-time power distribution data; and to obtain a traveling wave time difference value of the fault section based on traveling wave signals captured by traveling wave devices at both ends of the fault section;

[0036] A single-point fault location module is configured to determine the presence of a single fault point if the traveling wave time difference value of the fault section is within the time difference range of the corresponding traveling wave section, and to determine the location of the fault point based on the traveling wave time difference value of the fault section;

[0037] The multi-point fault location module is used to determine that there are multiple fault points if the traveling wave time difference value of the fault section is not within the time difference range of the corresponding traveling wave section, and to coordinate with the primary and secondary fusion switches to check the traveling wave sections step by step to obtain the locations of all fault points.

[0038] Furthermore, the calculating of the time difference range of each traveling wave section according to the position of the traveling wave device and the distribution network structure includes:

[0039] According to the position of the traveling wave device and the distribution network structure, all areas passed by the traveling wave during propagation in each traveling wave segment are determined to obtain the traveling wave propagation path of each traveling wave segment;

[0040] Determining a deceleration point and a corresponding deceleration coefficient for traveling wave propagation in the traveling wave propagation path according to the traveling wave characteristics and the traveling wave propagation path; the deceleration point and the deceleration coefficient are used to correct the propagation speed of the traveling wave;

[0041] The time difference range of each traveling wave segment is calculated based on the traveling wave propagation path, the deceleration point and the deceleration coefficient.

[0042] Furthermore, the power grid fault locating device is further used for:

[0043] Determining the distribution affiliation between the traveling wave sections according to the distribution network structure;

[0044] The traveling wave segments are graded according to the power distribution affiliation to obtain a segment grade of each traveling wave segment.

[0045] Furthermore, determining the fault section from the traveling wave section according to the real-time power distribution data includes:

[0046] performing abnormal data detection on the real-time power distribution data, and when abnormal data is detected in the real-time power distribution data, marking a traveling wave section where the primary and secondary fusion switch corresponding to the abnormal data is located as an abnormal section;

[0047] The abnormal segment with the highest segment level is determined as the fault segment.

[0048] Furthermore, the step-by-step checking of the traveling wave section by coordinating the primary and secondary fusion switches includes:

[0049] Determine the detection order of the abnormal sections according to the order of the section levels from high to low, and check the fault points in the abnormal sections step by step according to the detection order;

[0050] Among them, when detecting each abnormal section, the primary and secondary fusion switch is controlled to disconnect the traveling wave section with a section level lower than the current detection section, and then the traveling wave time difference value of the current detection section is calculated; the traveling wave time difference value of the current detection section is error-corrected according to the location of the known fault point to obtain the corrected traveling wave time difference value; and the fault point detection is performed on the current detection section according to the corrected traveling wave time difference value.

[0051] Furthermore, performing error correction on the traveling wave time difference value of the current detection section according to the location of the known fault point to obtain the corrected traveling wave time difference value includes:

[0052] According to the location and traveling wave characteristics of the known fault points, all fault points that affect the traveling wave time difference value of the current detection section are marked as impact points;

[0053] Calculating the time difference of the traveling wave generated by the influencing point on the current detection section to obtain an error value;

[0054] The traveling wave time difference value of the current detection section is corrected according to the error value to obtain a corrected traveling wave time difference value.

[0055] Furthermore, the obtaining of real-time power distribution data of the primary and secondary fusion switches in the distribution network and the location of the traveling wave device includes:

[0056] Deploy primary and secondary integrated switches based on the distribution network structure and grid operation requirements;

[0057] Acquire power distribution information and switch status information of the primary and secondary fusion switch in real time to obtain real-time power distribution data;

[0058] Acquire the traveling wave propagation velocity and the traveling wave effective range from the equipment information of the traveling wave device to obtain the traveling wave characteristics;

[0059] The deployment position of the traveling wave device is determined according to the traveling wave characteristics and the deployment status of the primary and secondary fusion switches.

[0060] An embodiment of the present invention further provides a computer device, comprising a processor and a memory, wherein a computer program is stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the power grid fault location method described in any one of the above items is implemented.

[0061] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program, wherein when the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the above-mentioned power grid fault location methods.

[0062] Compared with the prior art, the beneficial effects of a power grid fault location method, device, equipment and storage medium provided by the embodiments of the present invention are as follows: by taking the position of the traveling wave device in the distribution network as the endpoint, the distribution network structure is divided into several traveling wave segments, which is conducive to reducing the fault location error to a smaller range and accelerating the efficiency of locating the fault point using the traveling wave device; by judging whether a fault occurs in the distribution network based on the real-time distribution data of the primary and secondary fusion switches, if a fault occurs, the fault segment is determined based on the real-time distribution data, and then the fault segment is obtained based on the traveling wave signals captured by the traveling wave devices at both ends of the fault segment. The traveling wave time difference value narrows the fault point investigation scope and improves the fault location efficiency; by calculating the time difference range of each traveling wave segment and comparing the traveling wave time difference value of the fault segment with the time difference range, it is determined whether there is only a single fault point, which can effectively reduce the investigation time and locate all fault points, thereby improving the efficiency and accuracy of distribution network fault investigation; by coordinating the primary and secondary fusion switches to check the traveling wave segments step by step when it is determined that there are multiple fault points, the positions of all fault points are obtained, which can achieve accurate positioning and rapid detection of multiple fault points, thereby ensuring the stability and safety of distribution network operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 This is a flow chart of a power grid fault location method provided by an embodiment of the present invention;

[0064] Figure 2 Schematic diagram of the positions of switches and traveling wave devices in a distribution network structure provided by an embodiment of the present invention;

[0065] Figure 3 1 is a schematic structural diagram of a power grid fault locating device provided by an embodiment of the present invention;

[0066] Figure 4 It is a structural diagram of a computer device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0067] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0068] See also Figure 1 , Figure 1 1 is a flow chart of a method for locating a power grid fault provided by an embodiment of the present invention. The method for locating a power grid fault includes:

[0069] S1: Obtain real-time power distribution data of the primary and secondary fusion switches in the distribution network and the location of the traveling wave device;

[0070] Specifically, a primary / secondary fusion switch is an intelligent switch device that deeply integrates the switch body with sensors, intelligent control units, and other devices. Its real-time power distribution data includes power distribution information and switch status information collected by the primary / secondary fusion switch in the distribution network, specifically real-time secondary equipment operating information and primary equipment switching status. This real-time power distribution data is used to detect the normal operation of equipment in the distribution network and determine the switching status of each primary / secondary fusion switch.

[0071] As one of the optional embodiments, obtaining real-time power distribution data of the primary and secondary fusion switch in the distribution network and the location of the traveling wave device includes:

[0072] Deploy primary and secondary integrated switches based on the distribution network structure and grid operation requirements;

[0073] Acquire power distribution information and switch status information of the primary and secondary fusion switch in real time to obtain real-time power distribution data;

[0074] Acquire the traveling wave propagation velocity and the traveling wave effective range from the equipment information of the traveling wave device to obtain the traveling wave characteristics;

[0075] The deployment position of the traveling wave device is determined according to the traveling wave characteristics and the deployment status of the primary and secondary fusion switches.

[0076] The deploying of primary and secondary fusion switches according to the distribution network structure and grid operation requirements specifically includes: determining primary and secondary devices according to the distribution network structure and grid operation requirements, and obtaining a deployment plan for the primary and secondary fusion switches according to the interaction logic of the primary and secondary devices; and deploying the primary and secondary fusion switches according to the deployment plan.

[0077] Due to the complexity of the distribution network, when a fault occurs in the distribution network, the primary and secondary fusion switches usually generate a large amount of abnormal data, resulting in multiple devices being affected, making it difficult to identify the specific fault line. If there are multiple fault points in the distribution network fault, different fault points will affect each other, resulting in the traveling wave device being unable to effectively locate each fault point. Therefore, according to the distribution network structure, the embodiment of the present invention configures a primary and secondary fusion switch on each branch node and related equipment of the distribution network, and then can quickly locate the branch with the fault point by analyzing the data collected by the primary and secondary fusion switch. If the fault situation is complex, the secondary branch can also be disconnected by the primary and secondary fusion switch to avoid the secondary branch fault affecting the traveling wave device's positioning of the fault point on the branch, and can locate multiple fault points, thereby improving the accuracy of power grid fault detection.

[0078] Specifically, a distribution network contains a large number of devices and lines. Failures in some devices or lines will affect the operation of the distribution network, while failures in other devices or lines will not. Therefore, it is necessary to deploy primary and secondary fusion switches for the necessary distribution network equipment and circuits in appropriate locations based on the distribution network structure and grid operation requirements. For example, if a lighting fixture in a distribution area fails, it will not affect the operation of the distribution network. Relevant personnel do not need to analyze the fault point through distribution network data; they can directly determine the fault based on the condition of the lighting fixture. Therefore, there is no need to deploy primary and secondary fusion switches for the distribution network lines corresponding to the lighting fixture. For power generation equipment, if a failure occurs, it will affect the overall power supply of the distribution network. Therefore, it is necessary to select appropriate line nodes based on the grid structure to deploy primary and secondary fusion switches for the power generation equipment separately to ensure that the operation of the power generation equipment can be monitored, so as to provide circuit breaker protection and assist in fault location when a failure occurs.

[0079] The deployment plan for integrated primary and secondary switches includes all equipment and lines required for deployment, and the integrated primary and secondary switches are then deployed according to the deployment plan. It should be noted that as distribution networks evolve, their structure and operational requirements may change. Therefore, the deployment plan should be updated promptly as the distribution network evolves.

[0080] Furthermore, real-time access to distribution information and switch status information from the primary and secondary integrated switches is used to subsequently locate the fault section and provide collaborative assistance in locating the fault point. Deploying primary and secondary integrated switches allows for rapid acquisition of operating information from equipment within the distribution network, improving network security and providing technical support for subsequent fault location, increasing fault location efficiency. Acquiring real-time distribution data improves the efficiency of processing distribution network information and accelerates the network's response to faults.

[0081] Furthermore, due to the complex operating environment of the distribution network system and the presence of various electromagnetic interferences, the traveling wave devices may affect each other when locating the fault point, interfering with the collection of the traveling wave signal. Therefore, it is necessary to comprehensively consider the influence of various factors and determine the deployment location of the traveling wave device according to the actual situation to ensure that the fault point of the distribution network can be accurately located in the future.

[0082] Ideally, traveling wave signals propagate along the transmission line at speeds close to the speed of light. However, since distribution networks typically include multiple lines with varying inductance and capacitance, and deployed traveling wave devices can also affect the propagation speed of traveling wave signals on the lines, it is necessary to determine the traveling wave propagation speed for different lines based on the device information of the traveling wave device and the distribution network line information. Furthermore, different traveling wave devices have different ranges for capturing traveling waves, and may not be able to capture traveling wave signals that are too far away. Therefore, it is necessary to combine the traveling wave propagation speed to determine the maximum range within which each traveling wave device can capture traveling wave signals, i.e., the effective range of the traveling wave, and thus obtain the traveling wave characteristics. The traveling wave characteristics are the effective range of the traveling wave device and the corresponding traveling wave propagation speed at a certain point in the distribution network when the traveling wave device is deployed at that point.

[0083] Based on the effective range of the traveling wave characteristics, all routes requiring supervision in the distribution network are ensured to be covered by the traveling wave device. Combined with the deployment of primary and secondary fusion switches, the traveling wave device is deployed in a coordinated manner to ensure that the traveling wave device and the primary and secondary fusion switches can work together when locating the fault point. In the subsequently divided traveling wave sections, the fault point can be effectively located in all traveling wave sections. This embodiment of the present invention can monitor faults at all locations in the distribution network, improving the safety of the distribution network.

[0084] S2: Divide the distribution network structure into several routes with the location of the traveling wave device as an endpoint to obtain several traveling wave segments; calculate the time difference range of each traveling wave segment based on the location of the traveling wave device and the distribution network structure; wherein the time difference range is the range of traveling wave time difference values ​​corresponding to a fault point when the fault point exists in the traveling wave segment;

[0085] Specifically, the grid nodes where traveling wave devices are deployed are used as endpoints, and the distribution network structure is divided into multiple routes to form traveling wave segments. A traveling wave device is deployed at each end of the traveling wave segment, and fault points within the traveling wave segment are located using these two traveling wave devices. To ensure that the traveling wave segment fully covers the distribution network and avoids interference from other traveling wave devices when locating fault points within the traveling wave segment, the two closest traveling wave devices are typically selected as endpoints to divide the traveling wave segment. Aside from the traveling wave devices at both ends of the traveling wave segment, no other traveling wave devices exist within the segment. However, one or more primary and secondary fusion switches may be present.

[0086] As one of the optional embodiments, the calculating the time difference range of each traveling wave segment according to the location of the traveling wave device and the distribution network structure includes:

[0087] According to the position of the traveling wave device and the distribution network structure, all areas passed by the traveling wave during propagation in each traveling wave segment are determined to obtain the traveling wave propagation path of each traveling wave segment;

[0088] Determining a deceleration point and a corresponding deceleration coefficient for traveling wave propagation in the traveling wave propagation path according to the traveling wave characteristics and the traveling wave propagation path; the deceleration point and the deceleration coefficient are used to correct the propagation speed of the traveling wave;

[0089] The time difference range of each traveling wave segment is calculated based on the traveling wave propagation path, the deceleration point and the deceleration coefficient.

[0090] Specifically, because traveling wave devices calculate traveling wave time differences by transmitting and receiving traveling wave signals to acquire data, the range of these values ​​is affected by factors such as the propagation speed of the traveling wave signals. Therefore, for the same traveling wave segment, different traveling wave devices may result in different corresponding time difference ranges. Therefore, the calculation of the time difference range needs to take into account the corresponding traveling wave characteristics. Furthermore, due to the complex structure of the distribution network and the presence of various electromagnetic interferences that affect the propagation speed of the traveling wave, the influence of the distribution network structure on the time difference range calculation also needs to be considered when calculating the time difference range.

[0091] Among them, due to the complexity of the distribution network structure, the propagation speed of the traveling wave signal in the lines of different traveling wave sections may be affected by various factors and reduced. For example, the traveling wave signal may pass through a high-temperature area, a polyethylene material line, or a densely wired substation, which may significantly reduce the wave speed of the traveling wave signal. Therefore, according to the distribution network structure, all the areas through which the path of the traveling wave signal in each traveling wave section will pass are determined to obtain the traveling wave propagation path for subsequent analysis of deceleration points.

[0092] A deceleration point is a node in a traveling wave propagation path that decelerates the traveling wave signal. For example, based on the propagation path of a traveling wave signal, it is known that the traveling wave signal needs to pass through line A and line B in sequence. Line A is a conventional route, while line B is in a high-temperature environment. When the traveling wave signal enters line B, the propagation speed decreases. Therefore, the connection point between lines A and B is used as a deceleration point. It should be noted that deceleration points have a direction. When a traveling wave signal propagates from line B to line A, the traveling wave propagation speed is not affected by the deceleration point.

[0093] Furthermore, deceleration points vary in their deceleration effect on traveling wave signals. The deceleration coefficient refers to the degree to which the propagation velocity of a traveling wave signal decreases relative to its initial velocity after passing through the deceleration point. For example, if a traveling wave signal propagates from line A to line B, where the connection point between lines A and B is the deceleration point, c is the speed of light, and the traveling wave signal propagates at a velocity of 0.98c in line A and 0.95c in line B, then the deceleration coefficient at this deceleration point is approximately 96.93%.

[0094] Furthermore, the time difference range refers to the range of traveling wave time difference values ​​calculated when locating a fault point on a traveling wave segment using traveling wave devices at both ends of the segment, assuming there is a fault point on the segment, without interference from other factors. Without considering the deceleration coefficient, if the fault point is located at the midpoint of the line in the traveling wave segment, the traveling wave time difference value is 0 μs. When the fault point is located at the endpoint of the traveling wave segment, the traveling wave time difference value reaches its maximum value. For example, for a 10 km traveling wave segment, if there is no deceleration point, c is the speed of light, the propagation speed of the traveling wave signal is 0.98 c, and if the fault point is at the end in the reverse current direction, the traveling wave time difference value ΔT = 1000 / 0.98 c ≈ 34.01 μs, then the time difference range is [-34.01 μs, 34.01 μs]. It should be noted that the positive and negative signs of the traveling wave time difference value only indicate the direction. When the traveling wave time difference value is negative, it means that the fault point is close to the end of the traveling wave segment along the current direction. When the traveling wave time difference value is positive, it means that the fault point is close to the end of the traveling wave segment in the opposite current direction.

[0095] Furthermore, if there are deceleration points in the traveling wave section, the time difference range needs to be calculated based on the deceleration coefficient. For example, a traveling wave section has a total length of 10 km, with the line ends set as points A and B. There is a deceleration point C 3 km away from point B. The deceleration point direction is from point A to B, the deceleration coefficient is 98%, and the current direction is from point A, through point C, to point B. The initial value of the traveling wave propagation velocity in the AC section is 0.98c, and the initial value of the traveling wave propagation velocity in the CB section is 0.95c. When the fault point is at point A, the traveling wave time difference value △T = 3000 / 0.98c + 7000 / (98% × 0.98c) ≈ 34.50μs. When the fault point is at point B, the traveling wave time difference value △T = -10000 / 0.95c ≈ -35.09μs. Therefore, the time difference range of this traveling wave section is [-35.09μs, 34.50μs].

[0096] By obtaining the deceleration point and its deceleration coefficient, the embodiment of the present invention can correct the propagation speed of the traveling wave, reduce the influence of line and environmental factors on the calculation of the time difference range, reduce the fault point positioning error, and improve the calculation accuracy of the traveling wave time difference value. By calculating the time difference range, it can provide a basis for judging whether there are multiple fault points in the future, effectively improving the efficiency of the distribution network in analyzing fault conditions.

[0097] As an optional embodiment, after obtaining the plurality of traveling wave segments, the method further includes:

[0098] Determining the distribution affiliation between the traveling wave sections according to the distribution network structure;

[0099] The traveling wave segments are graded according to the power distribution affiliation to obtain a segment grade of each traveling wave segment.

[0100] Specifically, under normal circumstances, the distribution network has a tree-like or mesh structure, and different traveling wave segments have different functions of power transmission and distribution. Therefore, by dividing the segment levels, the functional positioning and subordinate relationships of each segment in the distribution network are clarified, such as main roads, branch routes and terminal routes, etc., and then in the subsequent fault point location process, some traveling wave segments can be isolated according to the segment level, and the fault segment can be quickly locked.

[0101] For example, the segment level of the traveling wave segment corresponding to the main road can be divided into level one, the segment level of the traveling wave segment corresponding to the level one branch can be divided into level two, the segment level of the traveling wave segment corresponding to the level two branch can be divided into level three, and so on, until all levels of branches are divided into corresponding segment levels.

[0102] S3: Determine whether a fault occurs in the distribution network based on the real-time power distribution data. If a fault occurs, determine the faulty section from the traveling wave sections based on the real-time power distribution data; and obtain a traveling wave time difference value of the faulty section based on traveling wave signals captured by traveling wave devices at both ends of the faulty section.

[0103] Specifically, when a distribution network fault occurs, devices within the network generate abnormal data. Therefore, by detecting abnormal data in real-time distribution data, it is determined that a distribution network fault has occurred, and the traveling wave segment containing the abnormal data is the fault segment. When a fault point exists within the fault segment, it propagates a traveling wave along the corresponding circuit of the fault segment to both ends. The traveling wave devices at both ends capture and record the traveling wave signals using sensors. The time difference between the two traveling wave devices is used to calculate the traveling wave time difference. The calculation formula for the traveling wave time difference is: ΔT = T1 - T2, where ΔT is the traveling wave time difference, T1 is the time it takes for the traveling wave signal to reach the traveling wave device along the current direction, and T2 is the time it takes for the traveling wave signal to reach the traveling wave device against the current direction.

[0104] For example, there is a fault point in a certain fault section, and the traveling wave signal emitted by the fault point is captured by the traveling wave devices at both ends of the fault section. If T1 is 0.0093 seconds and T2 is 0.0031 seconds, then it can be calculated that △T is 0.0062 seconds. If T1 is 0.0031 seconds and T2 is 0.0093 seconds, then it can be calculated that △T is -0.0062 seconds.

[0105] As one of the optional embodiments, determining the fault section from the traveling wave section according to the real-time power distribution data includes:

[0106] performing abnormal data detection on the real-time power distribution data, and when abnormal data is detected in the real-time power distribution data, marking a traveling wave section where the primary and secondary fusion switch corresponding to the abnormal data is located as an abnormal section;

[0107] The abnormal segment with the highest segment level is determined as the fault segment.

[0108] Specifically, real-time power distribution data is monitored to determine if a fault has occurred. For example, if real-time power distribution data is unavailable or differs from normal operating parameters, a fault is indicated. If abnormal data appears in the real-time power distribution data, the primary and secondary fusion switches corresponding to the abnormal data are identified, and the traveling wave section where the primary and secondary fusion switches are located is marked as an abnormal section.

[0109] Furthermore, in the distribution network, when a fault occurs in the upper-level traveling wave section, the lower-level traveling wave section will also be affected. Due to the complexity of the distribution network structure, there are a large number of trunk roads and branches. When a fault occurs in a traveling wave section with a higher section level, there may be a large number of traveling wave sections with abnormalities. If these abnormal sections are directly checked for fault points, it will take a lot of time and effort. Therefore, the abnormal section with the highest section level is selected as the fault section, which can screen out the traveling wave section with the highest probability of having a fault point to locate the fault point, thereby narrowing the scope of investigation.

[0110] See also Figure 2 A, B, C, D, E, F and G are traveling wave devices deployed on some lines in the distribution network. a, b, c, d and e are some primary and secondary fusion switches deployed on the lines. The section where A and G are located is the main line of the distribution line. By dividing, six traveling wave sections, AB, BC, BD, BE, AG and AF, can be obtained. According to the distribution network structure, AG is the main line with the highest section level; AB, BE and AF are primary branches with a section level lower than AG; BC and BD are secondary branches with the lowest section level.

[0111] By dividing the sections into levels, the embodiments of the present invention can clarify the subordinate relationship of each traveling wave section in the distribution network, provide a basis for subsequently narrowing the scope of fault point investigation, and by obtaining abnormal sections and fault sections, can quickly lock the fault area, reduce the investigation time, improve the overall efficiency of fault investigation, and improve the reliability of the distribution network.

[0112] S4: If the traveling wave time difference value of the fault section is within the time difference range of the corresponding traveling wave section, it is determined that a single fault point exists, and the location of the fault point is determined according to the traveling wave time difference value of the fault section;

[0113] Specifically, when there is only one fault point within the fault section, the calculated traveling wave time difference value for the fault section must be within the time difference range of the fault section. Since a distribution network fault may have multiple fault points, the presence of a fault point in the secondary circuit of the fault section will affect the calculation of the traveling wave time difference value for the fault section. Therefore, if the calculated traveling wave time difference value is not within the time difference range of the fault section, it indicates the presence of multiple fault points. By comparing the traveling wave time difference value of the fault section with the time difference range, it can be determined whether there is a single fault point or multiple fault points.

[0114] When there is only a single fault point, it means that the fault point is not affected by other fault points. Therefore, the calculated traveling wave time difference value of the fault section can be directly used to locate the fault point.

[0115] S5: If the traveling wave time difference value of the fault section is not within the time difference range of the corresponding traveling wave section, it is determined that there are multiple fault points, and the traveling wave sections are checked step by step in coordination with the primary and secondary fusion switches to obtain the locations of all fault points.

[0116] Specifically, when there are multiple fault points, the fault points may affect each other, and the calculated traveling wave time difference value of the fault section cannot locate the fault point. In order to locate all fault points, it is necessary to check the abnormal sections step by step according to the section level. By isolating and detecting each abnormal section, the mutual influence between the fault points can be avoided as much as possible, and the positioning of all fault points can be achieved. After the positioning of all fault points in the distribution network is sorted out, a fault location report is obtained.

[0117] As one of the optional embodiments, the step of coordinating the primary and secondary fusion switches to check the traveling wave segments step by step includes:

[0118] Determine the detection order of the abnormal sections according to the order of the section levels from high to low, and check the fault points in the abnormal sections step by step according to the detection order;

[0119] Among them, when detecting each abnormal section, the primary and secondary fusion switch is controlled to disconnect the traveling wave section with a section level lower than the current detection section, and then the traveling wave time difference value of the current detection section is calculated; the traveling wave time difference value of the current detection section is error-corrected according to the location of the known fault point to obtain the corrected traveling wave time difference value; and the fault point detection is performed on the current detection section according to the corrected traveling wave time difference value.

[0120] Specifically, due to the complex structure of the distribution network, if the abnormal sections are detected from low to high according to the section level, there may be a situation where a large number of branches need to be detected first, resulting in low efficiency. Therefore, in order to minimize the workload of fault location, the fault point detection is performed on the abnormal sections one by one in order from high to low according to the section level.

[0121] During testing, to prevent unlocated fault points in lower-level lines from affecting the fault location of the current testing section, the traveling wave section with a lower level than the current testing section is first disconnected via a primary / secondary fusion switch. The current testing section is the abnormal section being tested. For example, in a certain distribution network, there is a four-level distribution network structure. By analyzing the real-time distribution data obtained by the primary / secondary fusion switch, it is found that the data of the primary and secondary circuits are normal, while the data of the third and fourth circuits are abnormal. This indicates that there is no fault in the primary and secondary circuits, but there is a fault point in the third and fourth circuits. Since the fourth circuit is a branch of the third circuit, there is a fault point in the third circuit. Furthermore, since there may also be a fault point in the fourth circuit, in order to prevent the traveling wave device from being affected when locating the fault point of the third circuit, the primary / secondary fusion switch can be controlled to disconnect the fourth circuit, and the fault point of the third circuit can be located separately to ensure the accuracy of the positioning.

[0122] The fault point in the current detection section is then located by calculating the traveling wave time difference value. However, since the calculated traveling wave time difference value may be affected by a fault point in an abnormal section with a higher segment level, it is necessary to calculate the impact of the known fault point on the traveling wave time difference value, i.e., the error value. The traveling wave time difference value is then corrected to obtain the accurate time difference, i.e., the corrected traveling wave time difference value. The accurate fault point location is then determined based on the accurate time difference. The calculation formula for the accurate time difference is: E = △TW, where E is the accurate time difference and W is the error value.

[0123] For example, Figure 2If the abnormal sections are AB, BC, BD, and BE, then AB, BE, BC, and BD are inspected sequentially, from highest to lowest, based on their section levels. It should be noted that sections BC and BD have the same section level, so the order is irrelevant and can be adjusted based on actual conditions. First, the fault point is located in section AB. Since section AB is the highest-level abnormal section, the primary and secondary fusion switches at c are disconnected during inspection. At this point, section AB is unaffected by other faults, resulting in a zero error. Accurate traveling wave time difference values ​​are directly obtained, and the fault point location is determined. Furthermore, after the fault point in section AB is determined, section BE is inspected. The inspection sequence indicates that the fault point has been located in AB, while that in sections BC and BD has not. Therefore, section AB will not affect the fault point location in section BE. However, the branches of sections BC and BD, as well as other subsequent sections, need to be disconnected to prevent interference. Therefore, the primary and secondary fusion switches at c, d, and e are disconnected, disconnecting branches Cc, Dd, and the subsequent branches of e. This prevents section BE from being affected by Cc, Dd, and the subsequent routes. At this time, the traveling wave time difference value of the current detection section BE is calculated by the traveling wave devices at B and E to be 34.50μs, and the fault point in the AB section will affect the calculation of the traveling wave time difference value of the BE section. Therefore, according to the position of the fault point in the AB section and the propagation speed of the traveling wave signal at the fault point, the error value is calculated to be 15.11μs. The corrected traveling wave time difference value of the BE section is E=34.50μs-15.11μs=19.39μs, and then the fault point position in the BE section is determined according to the corrected traveling wave time difference value.

[0124] The embodiment of the present invention can isolate the current detection section to avoid being affected by the fault points in the subsequent sections, ensure the accuracy of the calculation of the traveling wave time difference value, improve the accuracy of fault point positioning, and correct the traveling wave time difference value by calculating the error value, thereby avoiding the influence of the fault point in the upper route on the positioning of the subsequent fault point, ensuring that the fault points in each section can be accurately located, and improving the reliability of distribution network fault detection.

[0125] As one of the optional embodiments, performing error correction on the traveling wave time difference value of the current detection section according to the location of the known fault point to obtain the corrected traveling wave time difference value includes:

[0126] According to the location and traveling wave characteristics of the known fault points, all fault points that affect the traveling wave time difference value of the current detection section are marked as impact points;

[0127] Calculating the time difference of the traveling wave generated by the influencing point on the current detection section to obtain an error value;

[0128] The traveling wave time difference value of the current detection section is corrected according to the error value to obtain a corrected traveling wave time difference value.

[0129] Specifically, based on the known location of the fault point, if the fault point is too far away and cannot affect the traveling wave delay value of the current detection section, there is no need to calculate the error value caused by the fault point. Therefore, only the fault point that will affect the detection section is obtained and marked as the impact point. For example, Figure 2 As shown in the figure, if the fault point in the AB section is 100 km away from the BE section, it is determined that the traveling wave signal of the fault point will not affect the traveling wave device of the BE section, and the error value caused by the fault point does not need to be considered. If the fault point in the AB section is 8 km away from the BE section, it is determined that the traveling wave signal of the fault point will affect the traveling wave device of the BE section, and the fault point is marked as an impact point.

[0130] Furthermore, the error value is calculated in the same way as the traveling wave time difference value, and the time required for the traveling wave signal emitted by the impact point to reach the traveling wave devices at both ends of the current detection section is calculated to obtain the error value. For example, Figure 2 As shown, if the current detection section is section BE, and the impact point is located in section AB, with a distance of 10 km from traveling wave device B and a distance of 30 km from traveling wave device E, calculation shows that the impact point will increase T2 obtained by traveling wave device B by 8.15 μs and T1 obtained by traveling wave device E by 24.14 μs. The error value W = 24.14 μs - 8.15 μs = 15.99 μs can be calculated. The resulting error value is then used to correct the traveling wave time difference to eliminate the influence of the fault point at the impact point on the calculation of the traveling wave time difference. By marking the impact point, the embodiments of the present invention can effectively screen out fault points that may affect fault location in the current detection section, thereby improving the efficiency and accuracy of fault location. By calculating the error value, it can ensure that the traveling wave signal time obtained by the traveling wave device truly reflects the propagation time of the traveling wave signal emitted by the fault point corresponding to the current detection section, thereby obtaining the true fault point location and improving the accuracy of fault location.

[0131] The embodiments of the present invention divide the distribution network structure into several traveling wave sections using the locations of the traveling wave devices in the distribution network as endpoints, which helps reduce the fault location error to a smaller range and speeds up the efficiency of locating the fault point using the traveling wave devices. By determining whether a fault has occurred in the distribution network based on the real-time distribution data of the primary and secondary fusion switches, if a fault has occurred, the fault section is determined based on the real-time distribution data, and the traveling wave time difference value of the fault section is obtained based on the traveling wave signals captured by the traveling wave devices at both ends of the fault section. This reduces the scope of fault point investigation and improves fault location efficiency. By calculating the time difference range of each traveling wave section and comparing the traveling wave time difference value of the fault section with the time difference range, it is determined whether there is only a single fault point. This can effectively reduce the investigation time and locate all fault points, thereby improving the efficiency and accuracy of distribution network fault investigation. When it is determined that there are multiple fault points, the primary and secondary fusion switches are coordinated to investigate the traveling wave sections step by step to obtain the locations of all fault points. This can achieve accurate positioning and rapid detection of multiple fault points, thereby ensuring the stability and safety of distribution network operation.

[0132] Correspondingly, the present invention also provides a power grid fault locating device, which can implement all the processes of the power grid fault locating method in the above embodiment.

[0133] See also Figure 3 , Figure 3 1 is a schematic diagram of the structure of a power grid fault location device provided by an embodiment of the present invention. The power grid fault location device includes:

[0134] The data acquisition module 301 is used to obtain the real-time power distribution data of the primary and secondary fusion switches in the distribution network and the location of the traveling wave device;

[0135] The segment division module 302 is configured to divide the distribution network structure into a plurality of routes with the location of the traveling wave device as an endpoint, thereby obtaining a plurality of traveling wave segments; and calculate the time difference range of each traveling wave segment based on the location of the traveling wave device and the distribution network structure; wherein the time difference range is the range of traveling wave time difference values ​​corresponding to a fault point when the traveling wave segment has a fault point.

[0136] The fault section identification module 303 is configured to determine whether a fault has occurred in the distribution network based on the real-time power distribution data. If a fault has occurred, the fault section is determined from the traveling wave sections based on the real-time power distribution data; and a traveling wave time difference value of the fault section is obtained based on the traveling wave signals captured by the traveling wave devices at both ends of the fault section.

[0137] A single-point fault location module 304 is configured to determine the presence of a single fault point if the traveling wave time difference value of the fault section is within the time difference range of the corresponding traveling wave section, and to determine the location of the fault point based on the traveling wave time difference value of the fault section;

[0138] The multi-point fault location module 305 is used to determine that there are multiple fault points if the traveling wave time difference value of the fault section is not within the time difference range of the corresponding traveling wave section, and to coordinate with the primary and secondary fusion switches to check the traveling wave sections step by step to obtain the locations of all fault points.

[0139] Preferably, the calculating the time difference range of each traveling wave segment according to the position of the traveling wave device and the distribution network structure includes:

[0140] According to the position of the traveling wave device and the distribution network structure, all areas passed by the traveling wave during propagation in each traveling wave segment are determined to obtain the traveling wave propagation path of each traveling wave segment;

[0141] Determining a deceleration point and a corresponding deceleration coefficient for traveling wave propagation in the traveling wave propagation path according to the traveling wave characteristics and the traveling wave propagation path; the deceleration point and the deceleration coefficient are used to correct the propagation speed of the traveling wave;

[0142] The time difference range of each traveling wave segment is calculated based on the traveling wave propagation path, the deceleration point and the deceleration coefficient.

[0143] Preferably, the power grid fault locating device is further used for:

[0144] Determining the distribution affiliation between the traveling wave sections according to the distribution network structure;

[0145] The traveling wave segments are graded according to the power distribution affiliation to obtain a segment grade of each traveling wave segment.

[0146] Preferably, determining the fault section from the traveling wave section according to the real-time power distribution data includes:

[0147] performing abnormal data detection on the real-time power distribution data, and when abnormal data is detected in the real-time power distribution data, marking a traveling wave section where the primary and secondary fusion switch corresponding to the abnormal data is located as an abnormal section;

[0148] The abnormal segment with the highest segment level is determined as the fault segment.

[0149] Preferably, the step of coordinating the primary and secondary fusion switches to check the traveling wave sections step by step includes:

[0150] Determine the detection order of the abnormal sections according to the order of the section levels from high to low, and check the fault points in the abnormal sections step by step according to the detection order;

[0151] Among them, when detecting each abnormal section, the primary and secondary fusion switch is controlled to disconnect the traveling wave section with a section level lower than the current detection section, and then the traveling wave time difference value of the current detection section is calculated; the traveling wave time difference value of the current detection section is error-corrected according to the location of the known fault point to obtain the corrected traveling wave time difference value; and the fault point detection is performed on the current detection section according to the corrected traveling wave time difference value.

[0152] Preferably, performing error correction on the traveling wave time difference value of the current detection section according to the location of the known fault point to obtain the corrected traveling wave time difference value includes:

[0153] According to the location and traveling wave characteristics of the known fault points, all fault points that affect the traveling wave time difference value of the current detection section are marked as impact points;

[0154] Calculating the time difference of the traveling wave generated by the influencing point on the current detection section to obtain an error value;

[0155] The traveling wave time difference value of the current detection section is corrected according to the error value to obtain a corrected traveling wave time difference value.

[0156] Preferably, the acquiring of real-time power distribution data of the primary and secondary fusion switches in the distribution network and the location of the traveling wave device includes:

[0157] Deploy primary and secondary integrated switches based on the distribution network structure and grid operation requirements;

[0158] Acquire power distribution information and switch status information of the primary and secondary fusion switch in real time to obtain real-time power distribution data;

[0159] Acquire the traveling wave propagation velocity and the traveling wave effective range from the equipment information of the traveling wave device to obtain the traveling wave characteristics;

[0160] The deployment position of the traveling wave device is determined according to the traveling wave characteristics and the deployment status of the primary and secondary fusion switches.

[0161] In specific implementation, the working principle, control process and technical effects achieved by the power grid fault locating device provided by the embodiment of the present invention are the same as those of the power grid fault locating method in the above embodiment, and will not be repeated here.

[0162] See also Figure 4 , Figure 4This is a block diagram of a computer device provided in an embodiment of the present invention. The computer device includes: a processor 401, a memory 402, and a computer program stored in the memory 402 and executable on the processor 401. When the processor 401 executes the computer program, the steps of the aforementioned power grid fault location method embodiment are implemented. Alternatively, when the processor 401 executes the computer program, the functions of the modules / units in the aforementioned apparatus embodiments are implemented.

[0163] Illustratively, the computer program may be divided into one or more modules / units, which are stored in the memory 402 and executed by the processor 401 to implement the present invention. The one or more modules / units may be a series of computer program instruction segments capable of implementing specific functions, and the instruction segments are used to describe the execution process of the computer program in the computer device.

[0164] The computer device may include, but is not limited to, a processor 401 and a memory 402. Those skilled in the art will appreciate that the schematic diagram is merely an example of a computer device and does not limit the computer device. The computer device may include more or fewer components than shown, or may combine certain components or different components. For example, the computer device may also include input and output devices, network access devices, buses, and the like.

[0165] The processor 401 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor. The processor 401 is the control center of the computer device, connecting various parts of the entire computer device using various interfaces and lines.

[0166] The memory 402 can be used to store the computer programs and / or modules. The processor 401 implements various functions of the computer device by running or executing the computer programs and / or modules stored in the memory 402 and calling the data stored in the memory 402. The memory 402 can mainly include a program storage area and a data storage area. The program storage area can store an operating system and at least one application required for a function (such as a sound playback function, an image playback function, etc.); the data storage area can store data created based on the use of the mobile phone (such as audio data, a phone book, etc.). In addition, the memory 402 can include high-speed random access memory and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0167] Wherein, if the module / unit integrated in the computer device is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor 401, it can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0168] An embodiment of the present invention further provides a computer-readable storage medium, which includes a stored computer program. When the computer program is executed, the device where the computer-readable storage medium is located is controlled to execute the power grid fault location method described in any of the above embodiments.

[0169] The embodiments of the present invention provide a power grid fault location method, device, equipment and storage medium, which have the following beneficial effects: by taking the position of the traveling wave device in the distribution network as the endpoint, the distribution network structure is divided into several traveling wave sections, which is conducive to reducing the fault location error to a smaller range and accelerating the efficiency of locating the fault point using the traveling wave device; by judging whether the distribution network has a fault based on the real-time distribution data of the primary and secondary fusion switches, if a fault occurs, the fault section is determined based on the real-time distribution data, and then the traveling wave of the fault section is obtained based on the traveling wave signals captured by the traveling wave devices at both ends of the fault section. The time difference value narrows the scope of fault point investigation and improves the efficiency of fault location. By calculating the time difference range of each traveling wave segment and comparing the traveling wave time difference value of the fault segment with the time difference range, it is determined whether there is only a single fault point, which can effectively reduce the investigation time and locate all fault points, thereby improving the efficiency and accuracy of distribution network fault investigation. When it is determined that there are multiple fault points, the primary and secondary fusion switches are coordinated to check the traveling wave segments step by step to obtain the positions of all fault points, which can achieve accurate positioning and rapid detection of multiple fault points, thereby ensuring the stability and safety of distribution network operation.

[0170] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for locating a power grid fault, characterized in that: include: Obtain real-time power distribution data of primary and secondary fusion switches in the distribution network and the location of traveling wave devices; The distribution network structure is divided into several routes with the location of the traveling wave device as an endpoint to obtain several traveling wave segments; the time difference range of each traveling wave segment is calculated based on the location of the traveling wave device and the distribution network structure; wherein the time difference range is the range of traveling wave time difference values ​​corresponding to a fault point when the fault point exists in the traveling wave segment; Determining whether a fault occurs in the distribution network based on the real-time power distribution data, and if a fault occurs, determining the faulty section from the traveling wave sections based on the real-time power distribution data; obtaining a traveling wave time difference value of the faulty section based on traveling wave signals captured by traveling wave devices at both ends of the faulty section; If the traveling wave time difference value of the fault section is within the time difference range of the corresponding traveling wave section, it is determined that a single fault point exists, and the location of the fault point is determined according to the traveling wave time difference value of the fault section; If the traveling wave time difference value of the fault section is not within the time difference range of the corresponding traveling wave section, it is determined that there are multiple fault points, and the traveling wave sections are checked step by step in coordination with the primary and secondary fusion switches to obtain the locations of all fault points.

2. The power grid fault location method according to claim 1, wherein: The calculating the time difference range of each traveling wave section according to the position of the traveling wave device and the distribution network structure includes: According to the position of the traveling wave device and the distribution network structure, all areas passed by the traveling wave during propagation in each traveling wave segment are determined to obtain the traveling wave propagation path of each traveling wave segment; Determining a deceleration point and a corresponding deceleration coefficient for traveling wave propagation in the traveling wave propagation path according to the traveling wave characteristics and the traveling wave propagation path; the deceleration point and the deceleration coefficient are used to correct the propagation speed of the traveling wave; The time difference range of each traveling wave segment is calculated based on the traveling wave propagation path, the deceleration point and the deceleration coefficient.

3. The power grid fault location method according to claim 1, wherein: After obtaining the plurality of traveling wave segments, the method further includes: Determining the distribution affiliation between the traveling wave sections according to the distribution network structure; The traveling wave segments are graded according to the power distribution affiliation to obtain a segment grade of each traveling wave segment.

4. The power grid fault location method according to claim 3, wherein: The determining of the fault section from the traveling wave section according to the real-time power distribution data comprises: performing abnormal data detection on the real-time power distribution data, and when abnormal data is detected in the real-time power distribution data, marking a traveling wave section where the primary and secondary fusion switch corresponding to the abnormal data is located as an abnormal section; The abnormal segment with the highest segment level is determined as the fault segment.

5. The power grid fault location method according to claim 4, characterized in that: The step of coordinating the primary and secondary fusion switches to check the traveling wave sections step by step includes: Determine the detection order of the abnormal sections according to the order of the section levels from high to low, and check the fault points in the abnormal sections step by step according to the detection order; Among them, when detecting each abnormal section, the primary and secondary fusion switch is controlled to disconnect the traveling wave section with a section level lower than the current detection section, and then the traveling wave time difference value of the current detection section is calculated; the traveling wave time difference value of the current detection section is error-corrected according to the location of the known fault point to obtain the corrected traveling wave time difference value; and the fault point detection is performed on the current detection section according to the corrected traveling wave time difference value.

6. The power grid fault location method according to claim 5, characterized in that: The error correction of the traveling wave time difference value of the current detection section according to the location of the known fault point to obtain the corrected traveling wave time difference value includes: According to the location and traveling wave characteristics of the known fault points, all fault points that affect the traveling wave time difference value of the current detection section are marked as impact points; Calculating the time difference of the traveling wave generated by the influencing point on the current detection section to obtain an error value; The traveling wave time difference value of the current detection section is corrected according to the error value to obtain a corrected traveling wave time difference value.

7. The power grid fault location method according to claim 1, wherein: The obtaining of real-time power distribution data of the primary and secondary fusion switches in the distribution network and the location of the traveling wave device includes: Deploy primary and secondary integrated switches based on the distribution network structure and grid operation requirements; Acquire power distribution information and switch status information of the primary and secondary fusion switch in real time to obtain real-time power distribution data; Acquire the traveling wave propagation velocity and the traveling wave effective range from the equipment information of the traveling wave device to obtain the traveling wave characteristics; The deployment position of the traveling wave device is determined according to the traveling wave characteristics and the deployment status of the primary and secondary fusion switches.

8. A power grid fault location device, characterized in that: include: Data acquisition module, used to obtain real-time power distribution data of primary and secondary fusion switches in the distribution network and the location of traveling wave devices; A segment division module is configured to divide the distribution network structure into a plurality of routes with the location of the traveling wave device as an endpoint, thereby obtaining a plurality of traveling wave segments; and calculate the time difference range of each traveling wave segment based on the location of the traveling wave device and the distribution network structure; wherein the time difference range is the range of traveling wave time difference values ​​corresponding to a fault point when the fault point exists in the traveling wave segment; a fault section identification module, configured to determine whether a fault has occurred in the distribution network based on the real-time power distribution data; if a fault has occurred, to determine the fault section from the traveling wave sections based on the real-time power distribution data; and to obtain a traveling wave time difference value of the fault section based on traveling wave signals captured by traveling wave devices at both ends of the fault section; A single-point fault location module is configured to determine the presence of a single fault point if the traveling wave time difference value of the fault section is within the time difference range of the corresponding traveling wave section, and to determine the location of the fault point based on the traveling wave time difference value of the fault section; The multi-point fault location module is used to determine that there are multiple fault points if the traveling wave time difference value of the fault section is not within the time difference range of the corresponding traveling wave section, and to coordinate with the primary and secondary fusion switches to check the traveling wave sections step by step to obtain the locations of all fault points.

9. The power grid fault location device according to claim 8, characterized in that: The calculating the time difference range of each traveling wave section according to the position of the traveling wave device and the distribution network structure includes: According to the position of the traveling wave device and the distribution network structure, all areas passed by the traveling wave during propagation in each traveling wave segment are determined to obtain the traveling wave propagation path of each traveling wave segment; Determining a deceleration point and a corresponding deceleration coefficient for traveling wave propagation in the traveling wave propagation path according to the traveling wave characteristics and the traveling wave propagation path; the deceleration point and the deceleration coefficient are used to correct the propagation speed of the traveling wave; The time difference range of each traveling wave segment is calculated based on the traveling wave propagation path, the deceleration point and the deceleration coefficient.

10. The power grid fault location device according to claim 8, characterized in that: The power grid fault locating device is further used for: Determining the distribution affiliation between the traveling wave sections according to the distribution network structure; The traveling wave segments are graded according to the power distribution affiliation to obtain a segment grade of each traveling wave segment.

11. The power grid fault location device according to claim 10, characterized in that: The determining of the fault section from the traveling wave section according to the real-time power distribution data comprises: performing abnormal data detection on the real-time power distribution data, and when abnormal data is detected in the real-time power distribution data, marking a traveling wave section where the primary and secondary fusion switch corresponding to the abnormal data is located as an abnormal section; The abnormal segment with the highest segment level is determined as the fault segment.

12. The power grid fault location device according to claim 11, characterized in that: The step of coordinating the primary and secondary fusion switches to check the traveling wave sections step by step includes: Determine the detection order of the abnormal sections according to the order of the section levels from high to low, and check the fault points in the abnormal sections step by step according to the detection order; Among them, when detecting each abnormal section, the primary and secondary fusion switch is controlled to disconnect the traveling wave section with a section level lower than the current detection section, and then the traveling wave time difference value of the current detection section is calculated; the traveling wave time difference value of the current detection section is error-corrected according to the location of the known fault point to obtain the corrected traveling wave time difference value; and the fault point detection is performed on the current detection section according to the corrected traveling wave time difference value.

13. The power grid fault location device according to claim 12, characterized in that: The error correction of the traveling wave time difference value of the current detection section according to the location of the known fault point to obtain the corrected traveling wave time difference value includes: According to the location and traveling wave characteristics of the known fault points, all fault points that affect the traveling wave time difference value of the current detection section are marked as impact points; Calculating the time difference of the traveling wave generated by the influencing point on the current detection section to obtain an error value; The traveling wave time difference value of the current detection section is corrected according to the error value to obtain a corrected traveling wave time difference value.

14. The power grid fault location device according to claim 8, characterized in that: The obtaining of real-time power distribution data of the primary and secondary fusion switches in the distribution network and the location of the traveling wave device includes: Deploy primary and secondary integrated switches based on the distribution network structure and grid operation requirements; Acquire power distribution information and switch status information of the primary and secondary fusion switch in real time to obtain real-time power distribution data; Acquire the traveling wave propagation velocity and the traveling wave effective range from the equipment information of the traveling wave device to obtain the traveling wave characteristics; The deployment position of the traveling wave device is determined according to the traveling wave characteristics and the deployment status of the primary and secondary fusion switches.

15. A computer device, characterized in that: The method comprises a processor and a memory, wherein a computer program is stored in the memory and configured to be executed by the processor, and wherein the processor implements the power grid fault location method according to any one of claims 1 to 7 when executing the computer program.

16. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, wherein when the device where the computer-readable storage medium is located executes the computer program, the power grid fault location method according to any one of claims 1 to 7 is implemented.

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