Distributed FA algorithm based on traveling wave positioning

Abstract

The invention relates to a distributed FA algorithm based on traveling wave positioning. The algorithm comprises the following steps: firstly, acquiring traveling wave recording data; then, according to the traveling wave recording data, obtaining an orientation index of a fault point, and combining topological information of the power distribution network to judge whether the fault point is located in an upstream and downstream control range of a target power distribution terminal; wherein the orientation index is used for evaluating the position of the fault point relative to the target power distribution terminal; and when it is judged that the fault point is located in the upstream and downstream control range of the target power distribution terminal, controlling a switch corresponding to the target power distribution terminal to act so as to complete positioning and isolation of the fault area. According to the method, the traveling wave theory is applied to the distributed FA of the power distribution network, the defect that the distributed FA strongly depends on peer-to-peer communication is overcome, fault positioning and isolation of the distributed FA without peer-to-peer communication can be achieved, and positioning is accurate and rapid.

Description

Technical Field

[0001] The present application relates to the technical field of power grid fault detection, and in particular to a distributed FA algorithm based on traveling wave positioning. Background Art

[0002] Distributed FA (Feeder Automation) is a distributed feeder automation that realizes the functions of fault location, fault isolation and automatic power supply restoration in non-faulty areas between feeders through peer-to-peer communication between distribution terminals in the region, and reports the processing results to the distribution automation master station. It does not rely on communication with the distribution master station, has higher reliability, and can achieve millisecond-level self-healing of the distribution network.

[0003] However, precisely because distributed FA currently relies heavily on peer-to-peer communication, when communication abnormalities occur, the distribution terminal needs to lock the distributed FA and exit the distributed FA mode, otherwise the fault point will be misjudged, causing huge safety and economic losses and safety hazards. Summary of the invention

[0004] Based on this, it is necessary to provide a distributed FA algorithm based on traveling wave positioning to address the above technical problems.

[0005] In a first aspect, the present application provides a distributed FA algorithm based on traveling wave positioning, which is used for a target distribution terminal in a distribution network. The algorithm includes: Acquire traveling wave recording data; According to the traveling wave recording data, the position index of the fault point is obtained, and combined with the topological information of the distribution network, it is determined whether the fault point is located within the upstream and downstream control range of the target distribution terminal; among which, the position index is used to evaluate the position of the fault point relative to the target distribution terminal; When it is determined that the fault point is located in the upstream and downstream control range of the target distribution terminal, the switch action corresponding to the target distribution terminal is controlled to complete the positioning and isolation of the fault area.

[0006] In one embodiment, the orientation indicator includes a position indicator; According to the traveling wave recording data, the fault point location indicators include: Extract the initial wave head and the effective wave head according to the traveling wave recording data; the effective wave head includes the first wave head that reaches the target distribution terminal after the initial wave head; The location index of the fault point is obtained based on the time difference between the initial wave head and the effective wave head arriving at the target distribution terminal.

[0007] In one embodiment, the orientation indicator comprises a direction indicator; According to the traveling wave recording data, the fault point location indicators include: The trend of the traveling wave waveform is obtained according to the traveling wave recording data, and the direction index of the fault is determined according to the trend of the traveling wave waveform.

[0008] In one embodiment, the orientation indicator includes a position indicator and a direction indicator; Obtain the location index of the fault point, and combine it with the topological information of the distribution network to determine whether the fault point is within the upstream and downstream control range of the target distribution terminal, including: Based on the topological information of the distribution network, a reference terminal adjacent to the target distribution terminal is searched on the same line with a direction indicator as a guide to obtain the topological distance between the reference terminal and the target distribution terminal; Compare the topological distance with the location index, and determine whether the fault point is within the upstream and downstream control range of the target distribution terminal based on the comparison results.

[0009] In one embodiment, judging whether the fault point is located within the upstream and downstream control range of the target power distribution terminal according to the comparison result includes: If the topological distance is less than the location index, it is judged that the fault point is within the upstream and downstream control range of the target distribution terminal.

[0010] In one embodiment, the algorithm further includes: All distribution terminals that obtain traveling wave recording data on the fault line are respectively used as target distribution terminals; For each target power distribution terminal, it is determined whether the fault point is within the upstream and downstream control range of the target power distribution terminal, and whether to control the switch action corresponding to the target power distribution terminal is determined based on the judgment result.

[0011] In one embodiment, the algorithm further includes: When it is determined that the fault point is outside the upstream and downstream control range of the target distribution terminal, or after the power supply is restored after fault repair, the traveling wave signal continues to be detected until the next fault occurs.

[0012] In a second aspect, the present application also provides a distributed FA implementation device based on traveling wave positioning. For use in a target distribution terminal in a distribution network, the device comprises: A data acquisition module, used for acquiring traveling wave recording data; An evaluation module is used to obtain the position index of the fault point based on the traveling wave recording data, and to determine whether the fault point is located within the upstream and downstream control range of the target distribution terminal in combination with the topological information of the distribution network; wherein the position index is used to evaluate the position of the fault point relative to the target distribution terminal; The response module is used to control the switch action corresponding to the target distribution terminal when it is determined that the fault point is located in the upstream and downstream control range of the target distribution terminal, so as to complete the positioning and isolation of the fault area.

[0013] In a third aspect, the present application further provides a power distribution terminal, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps in the above-mentioned distributed FA algorithm based on traveling wave positioning when executing the computer program.

[0014] The above-mentioned distributed FA algorithm based on traveling wave positioning is applied to the target distribution terminal in the distribution network, firstly, the traveling wave recording data is obtained; then, the azimuth index of the fault point is obtained according to the traveling wave recording data, and combined with the topological information of the distribution network, it is judged whether the fault point is located in the upstream and downstream control range of the target distribution terminal; wherein, the azimuth index is used to evaluate the position of the fault point relative to the target distribution terminal; when it is judged that the fault point is located in the upstream and downstream control range of the target distribution terminal, the corresponding switch action of the target distribution terminal is controlled to complete the positioning and isolation of the fault area. The present invention applies the traveling wave theory to the distributed FA of the distribution network, solves the disadvantage that the distributed FA is strongly dependent on peer-to-peer communication, and can not only realize the fault location and isolation of the distributed FA without peer-to-peer communication, but also locate accurately and quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. 1 is an application environment diagram of a distributed FA algorithm based on traveling wave positioning in one embodiment; Figure 2 Schematic diagram of a process of a distributed FA algorithm based on traveling wave positioning in one embodiment; Figure 3 A schematic diagram of traveling wave generation at the time of a fault in one embodiment; Figure 4 A schematic diagram of a traveling wave recording signal in an embodiment; Figure 5 This is a fault point location situation 1 in an embodiment; Figure 6 This is a second fault point location situation in an embodiment; Figure 7 It is a flow chart of a traveling wave positioning distributed FA algorithm in one embodiment; Figure 8 It is a structural block diagram of a distributed FA implementation device based on traveling wave positioning in one embodiment. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0017] The embodiment of the present application provides a distributed FA algorithm based on traveling wave positioning, such as Figure 1The 10KV hand-in-hand distribution line shown in the figure is used as an example to illustrate the application scenario of the algorithm. Assume that the 10KV line is equipped with 4 switches, including switch 1 to switch 4, and each switch is equipped with a distribution terminal FTU1 to FTU4, and each distribution terminal is equipped with a traveling wave monitoring unit.

[0018] like Figure 2 As shown, the algorithm provided in this embodiment is applied to a target distribution terminal in a distribution network, wherein the target distribution terminal is such as a DTU (Data Transfer Unit), a FTU (Feeder Terminal Unit), etc. The algorithm includes the following steps: Step 202, obtaining traveling wave recording data.

[0019] The traveling wave signal in the power system is captured by a traveling wave sensor, which is usually a high-frequency current transformer or a voltage transformer, and then a high-speed data acquisition unit is used to collect the signal output by the traveling wave sensor. The high-speed data acquisition unit usually has a high sampling rate and sufficient resolution to ensure that the details of the traveling wave signal are captured. The high-frequency recording of the traveling wave unit is achieved by the traveling wave sensor and the high-speed data acquisition unit to obtain the traveling wave recording data. In this embodiment, due to accuracy requirements, the recording frequency is preferably not less than 100MHZ, and the higher the recording frequency, the more accurate the positioning. The present invention does not consider the positioning fuzzy area caused by accuracy problems. This fuzzy area can be processed by short delay isolation.

[0020] Step 204, obtain the azimuth index of the fault point based on the traveling wave recording data, and combine the topological information of the distribution network to determine whether the fault point is located within the upstream and downstream control range of the target distribution terminal; wherein the azimuth index is used to evaluate the position of the fault point relative to the target distribution terminal.

[0021] Among them, the orientation index reflects the direction and approximate location of the fault point with the target distribution terminal as the reference point. The upstream and downstream control range of the target distribution terminal refers to the distance between the switch corresponding to the target distribution terminal and the corresponding switches of the adjacent two distribution terminals. Figure 1 In the scenario, taking the distribution terminal corresponding to switch 2 as the target distribution terminal as an example, its upstream and downstream control range refers to the range from switch 2 to switch 1 and the range from switch 2 to switch 3.

[0022] According to the traveling wave recording data, the direction and approximate position of the fault point relative to the target distribution terminal, that is, the azimuth index, are obtained; then, according to the topological information of the distribution network, the upstream and downstream control range of the target distribution terminal is determined; according to the azimuth index, it is judged whether the fault point is within the upstream and downstream control range of the target distribution terminal. Then, the azimuth index and the topological information of the distribution network are combined to judge whether the fault point is within the upstream and downstream control range of the target distribution terminal.

[0023] In this embodiment, the topological information of the distribution network includes the order of the distribution terminals on the line and the distances between the various areas recorded through field surveys. The relevant topological information is processed and corrected before being entered into the distribution terminals. Figure 1 For example, the topological information entered into the distribution terminal corresponding to switch 1 includes the distance L1 from the upstream substation outlet and the distance L2 from the downstream switch; the topological information entered into the distribution terminal corresponding to switch 2 includes the distance L2 from the upstream switch 1 and the distance L3 from the downstream switch 3; and so on.

[0024] Step 206: When it is determined that the fault point is located in the upstream and downstream control range of the target power distribution terminal, the switch action corresponding to the target power distribution terminal is controlled to complete the positioning and isolation of the fault area.

[0025] by Figure 1 For example, taking the distribution terminal corresponding to switch 1 as the target distribution terminal, step 204 will determine that the fault point is within the upstream and downstream control range of the target distribution terminal, and the target distribution terminal will control switch 1 to trip to complete the isolation of one side of the fault point; taking the distribution terminal corresponding to switch 2 as the target distribution terminal, the target distribution terminal will also control switch 2 to trip to complete the isolation of the other side of the fault point, and finally complete the positioning and isolation of the fault area of ​​the entire line.

[0026] When it is determined that the fault point is outside the upstream and downstream control range of the target distribution terminal, the switch corresponding to the target distribution terminal will not operate. Figure 1 For example, when switch 3 and switch 4 are the target distribution terminals, the position indicators will show that they exceed the upstream and downstream control ranges of the distribution terminals corresponding to the two switches, so the two switches remain closed.

[0027] Traditional traveling wave ranging applications include two methods: single-ended traveling wave ranging and double-ended traveling wave ranging. Single-ended traveling wave ranging is to install a measuring device at one end of the line and use the time difference between the first traveling wave measured when the line fails and the reflected second traveling wave to calculate the distance between the measuring point and the fault point. Figure 3As shown, a traveling wave measuring device is installed on switch K1. The first traveling wave measured at K1 is S1. S1 is reflected twice at K1 and the fault point, and the reflected wave S2 is measured at K1. Then the time difference is twice the distance from K1 to the fault point. The above considers the situation where the fault point is close to K1. In fact, if the fault point is close to switch K2, the second traveling wave measured should be the transmitted wave S3 that penetrates the fault point by K3. If there is a line on the upper end of K1, S1 will be transmitted, and the transmitted traveling wave will be reflected back at the far end to form a transmitted wave. It can be seen that the traveling wave measured by single-end is more complicated. In some cases, it is difficult to identify the type of the second traveling wave, resulting in incorrect ranging results. Double-end traveling wave ranging is to install traveling wave ranging equipment at both ends of the line, and calculate the location of the fault point by detecting the time difference between the first traveling wave reaching both ends. It can be seen that the two-end traveling wave ranging only needs to identify the first traveling wave, but this method requires the devices at both ends to have high-precision real-time clocks. For example, for overhead lines, the wave speed is about 300km / ms, so the time difference of each us will cause an error of 150m. The use of GPS timing can reduce the time error to less than 1us, making this algorithm feasible. In addition, the two devices of the two-end traveling wave ranging need to communicate with each other or send the time information to the same master station to calculate the fault location.

[0028] In response to the above problems, this embodiment proposes an algorithm combining traveling wave ranging with distributed FA. It does not pursue accurate fault location, but only needs to determine the fault location area. Therefore, it does not need to determine the nature of the traveling wave, nor does it require the participation of the master station. It utilizes the characteristics of distributed FA, that is, each target distribution terminal is an independent unit, and combines the traveling wave ranging principle to determine whether the fault point is within the control range of the target distribution terminal, and then controls the switch action corresponding to the target distribution terminal, so as to quickly complete the positioning and isolation of the fault area. In addition, while inheriting the advantages of traditional distributed FA such as fast fault location and segmented isolation, this embodiment solves the disadvantages of traditional distributed FA relying on peer-to-peer communication, bringing new feasibility to the implementation of distributed FA in areas without communication conditions, reducing the investment in laying communication equipment, and saving costs.

[0029] In one embodiment, the orientation index includes a direction index; in step 204, obtaining the orientation index of the fault point according to the traveling wave recording data includes: obtaining the traveling wave waveform trend according to the traveling wave recording data, and determining the direction index of the fault according to the traveling wave waveform trend.

[0030] like Figure 4 As shown, for Figure 3 The waveform diagram is drawn from the traveling wave recording data collected during the fault. Figure 3When between switch K1 and switch K2, the fault point is judged to be upstream or downstream of the line by the rising or falling trend of the waveform. The corresponding waveform of the traveling wave recording data obtained by switch K1 shows that the fault point is downstream of K1, and the corresponding waveform of the traveling wave recording data obtained by switch K2 shows that the fault point is upstream of K1.

[0031] In this embodiment, the direction indicator reflects whether the fault point is located upstream or downstream of the target power distribution terminal.

[0032] In one embodiment, the orientation index includes a position index; in step 204, obtaining the orientation index of the fault point according to the traveling wave recording data includes: extracting the initial wave head and the effective wave head according to the traveling wave recording data; the effective wave head includes the first wave head arriving at the target distribution terminal after the initial wave head; obtaining the position index of the fault point according to the time difference between the initial wave head and the effective wave head arriving at the target distribution terminal.

[0033] The calculation of the position index is mainly based on the principle of traveling wave ranging. In the traveling wave recording data, in order to ensure that the reflected wave can be recorded in the terminal fault area, the recording time needs to cover multiple groups of traveling waves. Due to the serious attenuation of traveling waves, the algorithm only takes the first few waves for analysis. Figure 4 , the first traveling wave has the strongest signal and is the initial wave head; the effective wave head includes the second traveling wave, and the effective wave head may be a reflected wave or a transmitted wave. This embodiment does not specifically analyze its properties. Assuming the sampling rate is SR, by counting the difference in the number of sampling points N between the initial wave head and the effective wave head, the time difference T = N / SR between the initial wave head and the effective wave head reaching the target distribution terminal can be calculated. Calculate the wave speed V, multiply the wave speed by the time difference T and divide by 2 to get the location index of the fault point.

[0034] In the transmission line, since the impedance of the same line is evenly distributed, in the same transmission medium, the distributed inductance of the line is L, and the distributed capacitance C is basically a constant, so the wave velocity V=1 / √LC, and the traveling wave velocity is approximately equal to 2.89942318×10^5 km / s, which can also be calculated through the basic structural parameters of the line.

[0035] In one embodiment, the orientation index includes a position index and a direction index; step 204 includes: based on the topological information of the distribution network, searching for a reference terminal adjacent to the target distribution terminal on the same line with the direction index as a guide, and obtaining the topological distance between the reference terminal and the target distribution terminal; comparing the topological distance with the position index, and judging whether the fault point is located within the upstream and downstream control range of the target distribution terminal according to the comparison result.

[0036] The specific working principle is as follows Figures 3 to 5 As shown, Figure 3 for Figure 5 Schematic diagram of waveform generation for the fault condition shown, Figure 4 for Figure 5 The waveform of the traveling wave recording data of the fault condition shown. The distribution terminal corresponding to switch K1 is used as the target distribution terminal. According to the traveling wave recording data, the direction index of the fault point is first determined, that is, it is located downstream of the target distribution terminal. According to the topological information, the nearest distribution terminal is searched in the downstream line of the target distribution terminal as the reference terminal. The reference terminal corresponds to switch K2, and the topological distance between the reference terminal and the target distribution terminal is determined to be L2. The position index of the fault point from the target distribution terminal is LS1 = 1 / 2*V*T (K1_T2-K1_T1) , where V represents the wave velocity, T (K1_T2-K1_T1) Indicates the time difference between K1_T2 and K1_T1. The target distribution terminal FTU1 detects the fault point as the downstream of the corresponding switch K1, and the position index is LS1. By verifying the size of the total length of the reference terminal line L2 and LS1 downstream of switch K1, the fault point can be located and the switch K1 can be controlled to trip, thereby locating and isolating the fault area.

[0037] The distribution terminal corresponding to switch K2 is used as the target distribution terminal. The direction index of the fault point is first determined based on the traveling wave recording data, that is, it is located upstream of the target distribution terminal. According to the topological information, the nearest distribution terminal is searched in the upstream line of the target distribution terminal as the reference terminal. The reference terminal corresponds to switch K1, and the topological distance between the reference terminal and the target distribution terminal is determined to be L2. The K2_T3 moment is a reflected wave, and the position index of the fault point from the target distribution terminal is LF1 = 1 / 2*V*T (K2_T3-K2_T1) , where T (K2_T3-K2_T1) Indicates the time difference between K2_T3 and K2_T1. K2_T2 is the time when the upstream wave penetrates the fault point. Due to the signal attenuation and distance factors, the target distribution terminal may identify and calculate the position index as LF1* = 1 / 2*V*T (K2_T2-K2_T1) , where T (K2_T2-K2_T1) Indicates the time difference between K2_T2-K2_T1. In fact, according to the principle of traveling wave propagation, it can be determined that if the fault point is within the control range of the target distribution terminal, LF1 and LF1* are both smaller than L2, thereby locating the fault point and controlling the switch K2 to trip to achieve fault isolation. According to the principle of traveling wave ranging, it can be determined that when the fault point is outside the control range of the target distribution terminal, LF1 and LF1* will be greater than L2.

[0038] When the fault is outside the control range of the target distribution terminal, such as Figure 6 As shown in the figure, when FTU1 is used as the target distribution terminal, the location index LS1 of the target distribution terminal detecting the fault point is greater than L2, and the fault point can be located as a fault outside the control range of the target distribution terminal, so the tripping action of switch K1 is not executed.

[0039] Therefore, based on the time difference between the first wave head and the second wave head, it is possible to determine whether the fault point is within the fault range of the target distribution terminal, avoiding the need to judge the nature of the second wave head, and effectively improving the efficiency and accuracy of fault location and fault isolation.

[0040] In one embodiment, judging whether the fault point is located within the upstream and downstream control range of the target power distribution terminal according to the comparison result includes: if the topological distance is less than the location index, judging that the fault point is located within the upstream and downstream control range of the target power distribution terminal.

[0041] In one embodiment, the algorithm also includes: taking all distribution terminals that obtain traveling wave recording data on the fault line as target distribution terminals; for each target distribution terminal, judging whether the fault point is located within the upstream and downstream control range of the target distribution terminal, and determining whether to control the switch action corresponding to the target distribution terminal based on the judgment result.

[0042] Each distribution terminal in the distribution network can be configured with a traveling wave unit to monitor the traveling wave. When a zero-mode voltage mutation occurs, the traveling wave exceeds the threshold, or a fault is detected, the traveling wave unit of the corresponding distribution terminal can be triggered to perform high-frequency recording and start the distributed FA algorithm. The distribution terminal that starts the algorithm is used as the target distribution terminal, and the above-mentioned process from step 202 to step 206 is executed to complete fault isolation.

[0043] In one embodiment, the algorithm further includes: when it is determined that the fault point is outside the upstream and downstream control range of the target power distribution terminal, or after the power supply is restored after fault repair, continuing to detect the traveling wave signal until the next fault occurs.

[0044] If the target power distribution terminal determines that the upstream and downstream faults of the switch corresponding to the terminal are present, the fault inspection and repair work will be performed until the power supply is restored, and then the distributed FA algorithm will be restored until the next fault occurs and triggers the distributed FA algorithm to start. If the target power distribution terminal determines that the upstream and downstream faults of the switch corresponding to the terminal are not present, the distributed FA algorithm will be directly restored until the next fault occurs and triggers the distributed FA algorithm to start.

[0045] like Figure 7 As shown, it is the complete flow chart of the distributed FA algorithm for traveling wave positioning.

[0046] The present invention proposes a new algorithm, which is based on traveling wave theory and applies traveling waves at the moment of fault to distributed FA in distribution network, so as to solve the drawback that distributed FA is strongly dependent on peer-to-peer communication. It not only realizes relatively accurate fault area delineation, but also realizes rapid fault location and isolation of distributed FA in the absence of peer-to-peer communication, and is compatible with the functions of distributed FA and the advantages of traveling wave positioning.

[0047] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0048] Based on the same inventive concept, the embodiment of the present application also provides a distributed FA implementation device based on traveling wave positioning for implementing the above-mentioned distributed FA algorithm based on traveling wave positioning. The implementation solution provided by the device to solve the problem is similar to the implementation solution recorded in the above-mentioned algorithm, so the specific limitations in one or more embodiments of the distributed FA implementation device based on traveling wave positioning provided below can refer to the limitations of the distributed FA algorithm based on traveling wave positioning above, and will not be repeated here.

[0049] In one embodiment, Figure 8 As shown, a distributed FA implementation device based on traveling wave positioning is provided, which is used for a target distribution terminal in a distribution network, including: a data acquisition module 802, an evaluation module 804 and a response module 806, wherein: The data acquisition module 802 is used to acquire traveling wave recording data; Evaluation module 804 is used to obtain the position index of the fault point according to the traveling wave recording data, and determine whether the fault point is located in the upstream and downstream control range of the target distribution terminal in combination with the topological information of the distribution network; wherein the position index is used to evaluate the position of the fault point relative to the target distribution terminal; The response module 806 is used to control the switch action corresponding to the target distribution terminal to locate and isolate the fault area when it is determined that the fault point is located in the upstream and downstream control range of the target distribution terminal.

[0050] In one embodiment, the orientation index includes a position index; in the evaluation module 804, according to the traveling wave recording data, obtaining the orientation index of the fault point includes: extracting the initial wave head and the effective wave head according to the traveling wave recording data; the effective wave head includes the first wave head that arrives at the target distribution terminal after the initial wave head; according to the time difference between the initial wave head and the effective wave head arriving at the target distribution terminal, obtaining the position index of the fault point.

[0051] In one embodiment, the orientation index includes a direction index; in the evaluation module 804, obtaining the orientation index of the fault point according to the traveling wave recording data includes: obtaining the traveling wave waveform trend according to the traveling wave recording data, and determining the direction index of the fault according to the traveling wave waveform trend.

[0052] In one embodiment, the orientation index includes a position index and a direction index; the evaluation module 804 obtains the orientation index of the fault point, and combines the topological information of the distribution network to determine whether the fault point is located within the upstream and downstream control range of the target distribution terminal, including: based on the topological information of the distribution network, searching for a reference terminal adjacent to the target distribution terminal on the same line with the direction index as a guide, and obtaining the topological distance between the reference terminal and the target distribution terminal; comparing the topological distance with the position index, and determining whether the fault point is located within the upstream and downstream control range of the target distribution terminal according to the comparison result.

[0053] In one embodiment, the evaluation module 804 determines whether the fault point is located within the upstream and downstream control range of the target distribution terminal according to the comparison result, including: if the topological distance is less than the location index, then it is determined that the fault point is located within the upstream and downstream control range of the target distribution terminal.

[0054] In one embodiment, the device is also used to take all distribution terminals that obtain traveling wave recording data on the fault line as target distribution terminals; for each target distribution terminal, it is determined whether the fault point is located within the upstream and downstream control range of the target distribution terminal, and whether to control the switch action corresponding to the target distribution terminal based on the judgment result.

[0055] In one embodiment, the device is also used to continue detecting the traveling wave signal when it is determined that the fault point is outside the upstream and downstream control range of the target power distribution terminal, or after the power supply is restored after fault repair, until the next fault occurs.

[0056] Each module in the above-mentioned distributed FA implementation device based on traveling wave positioning can be implemented in whole or in part by software, hardware and their combination. Each of the above-mentioned modules can be embedded in or independent of the processor in the power distribution terminal in the form of hardware, or can be stored in the memory in the power distribution terminal in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0057] In one embodiment, the power distribution terminal involved includes a memory and a processor. The memory stores a computer program. When the processor executes the computer program, the steps in all the above algorithm embodiments are implemented.

[0058] In one embodiment, an embedded readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in all the above algorithm embodiments are implemented.

[0059] In one embodiment, an embedded program product is provided, including an embedded program, which implements the steps in all the above algorithm embodiments when executed by a processor.

[0060] 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, stored data, displayed data, 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 relevant data must comply with relevant laws, regulations and standards of relevant countries and regions.

[0061] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment algorithm can be completed by instructing the relevant hardware through an embedded program, and the embedded program can be stored in a non-volatile embedded readable storage medium. When the embedded program is executed, it can include the processes of the embodiments of the above-mentioned algorithms. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile 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, ferroelectric random access memory (FRAM), phase change memory (PCM), etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0062] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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 specification.

[0063] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A distributed FA algorithm based on traveling wave positioning, characterized in that: For a target distribution terminal in a distribution network, the algorithm includes: Acquire traveling wave recording data; According to the traveling wave recording data, the azimuth index of the fault point is obtained, and combined with the topological information of the distribution network, it is determined whether the fault point is located within the upstream and downstream control range of the target distribution terminal; wherein the azimuth index is used to evaluate the position of the fault point relative to the target distribution terminal; When it is determined that the fault point is located in the upstream and downstream control range of the target power distribution terminal, the switch action corresponding to the target power distribution terminal is controlled to complete the positioning and isolation of the fault area.

2. The algorithm according to claim 1, characterized in that The orientation index includes a position index; The obtaining of the position index of the fault point according to the traveling wave recording data comprises: Extracting an initial wave head and an effective wave head according to the traveling wave recording data; the effective wave head includes the first wave head that reaches the target power distribution terminal after the initial wave head; The location index of the fault point is obtained according to the time difference between the initial wave head and the effective wave head reaching the target power distribution terminal.

3. The algorithm according to claim 1, characterized in that The orientation index includes a direction index; The obtaining of the position index of the fault point according to the traveling wave recording data comprises: The traveling wave waveform trend is obtained according to the traveling wave recording data, and the direction index of the fault is determined according to the traveling wave waveform trend.

4. The algorithm according to claim 1, characterized in that The orientation index includes a position index and a direction index; The acquiring of the position index of the fault point and combining the topological information of the distribution network to determine whether the fault point is located within the upstream and downstream control range of the target distribution terminal include: Based on the topological information of the distribution network, searching for a reference terminal adjacent to the target distribution terminal on the same line with the direction index as a guide, and obtaining a topological distance between the reference terminal and the target distribution terminal; The topological distance is compared with the location index, and it is determined whether the fault point is located within the upstream and downstream control range of the target power distribution terminal according to the comparison result.

5. The algorithm according to claim 4, characterized in that The step of judging whether the fault point is located within the upstream and downstream control range of the target power distribution terminal according to the comparison result includes: If the topological distance is less than the location index, it is determined that the fault point is located within the upstream and downstream control range of the target power distribution terminal.

6. The algorithm according to claim 1, characterized in that The algorithm also includes: All the distribution terminals on the fault line that obtain the traveling wave recording data are respectively used as the target distribution terminals; For each of the target power distribution terminals, it is determined whether the fault point is located within the upstream and downstream control range of the target power distribution terminal, and whether to control the switch action corresponding to the target power distribution terminal is determined according to the determination result.

7. The algorithm according to claim 1, characterized in that The algorithm also includes: When it is determined that the fault point is outside the upstream and downstream control range of the target power distribution terminal, or after the power supply is restored after fault repair, the traveling wave signal continues to be detected until the next fault occurs.

8. A distributed FA implementation device based on traveling wave positioning, characterized in that: For a target power distribution terminal in a power distribution network, the device comprises: A data acquisition module, used for acquiring traveling wave recording data; An evaluation module, used to obtain the position index of the fault point according to the traveling wave recording data, and determine whether the fault point is located within the upstream and downstream control range of the target distribution terminal in combination with the topological information of the distribution network; wherein the position index is used to evaluate the position of the fault point relative to the target distribution terminal; The response module is used to control the switch action corresponding to the target distribution terminal when it is determined that the fault point is located in the upstream and downstream control range of the target distribution terminal, so as to complete the fault area positioning and isolation.

9. A power distribution terminal, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the algorithm according to any one of claims 1 to 7 are implemented.

10. An embedded computer readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the algorithm of any one of claims 1 to 7 are implemented.

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