Distribution line fault positioning system based on directional traveling waves

Abstract

The invention provides a distribution line fault positioning system based on directional traveling waves, and the system comprises a plurality of monitoring terminals which are arranged on a distribution line, each monitoring terminal comprises a current traveling wave collection unit and a voltage traveling wave collection unit, the current traveling wave collection units are used for collecting current traveling waves on the distribution line, and the voltage traveling wave collection units are used for collecting voltage traveling waves on the distribution line; the voltage traveling wave acquisition unit is used for acquiring voltage traveling waves on a distribution line; and the upper computer can monitor initial traveling wave time information of all the monitoring terminals on the distribution line and is used for determining a fault position according to the voltage traveling waves and the current traveling waves collected by the plurality of monitoring terminals and the initial traveling wave time information. According to the distribution line fault positioning system based on the direction traveling waves provided by the invention, the plurality of monitoring terminals are arranged on the distribution line, and the specific position of the fault can be determined by using the plurality of monitoring terminals and the traveling waves when the distribution line has the fault, so that the problem of accurate positioning of the distribution network is solved, the fault finding time is shortened, and the fault positioning efficiency is improved. And the power supply reliability of the distribution line is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power system fault detection and relay protection, and in particular to a distribution line fault location system based on directional traveling waves. Background Art

[0002] The distribution network is an important hub connecting the transmission link and power users, and its power supply reliability is directly related to the user experience. The distribution network double-end traveling wave ranging has high accuracy and is less affected by factors such as line operation mode, transition resistance, transformer conversion error, and uneven distribution of line parameters along the corridor. After a fault occurs, the fault can be quickly located, reducing line inspection time.

[0003] At present, many manufacturers have proposed a two-terminal traveling wave ranging solution for distribution networks. The distribution network traveling wave ranging system based on the principle of two-terminal ranging consists of three parts: monitoring terminal, master station and power system synchronous clock. The monitoring terminal is installed on the distribution line and is responsible for the collection and extraction of current, voltage and traveling wave signals, the recording of the arrival time of the initial traveling wave of the fault, and the communication with the master station. The monitoring terminal consists of a current transformer, a voltage transformer, a data acquisition and processing unit, a CPU (Central Processing Unit), a GPS (Global Positioning System) and a communication unit. The master station provides fault data display, analysis and ranging functions. The power system synchronous clock provides accurate time information for the system.

[0004] The traveling wave ranging master station is responsible for the display, analysis and ranging functions of fault data. At present, most manufacturers deploy centralized master stations, and all terminal data is uploaded to the centralized master station, which results in the centralization of master station data, heavy burden and large traffic. There are coordination problems between the centralized master station and the existing distribution automation master station. One way is to deploy the centralized master station separately from the existing distribution automation master station. The disadvantage of this method is that the hardware resources of the two systems cannot be reused, which increases investment; the terminal needs to communicate with the two master stations. Another way is to integrate the centralized ranging master station into the existing distribution automation master station. The disadvantage of this method is that the existing distribution automation master station needs to be upgraded and renovated, and it usually involves coordination and cooperation between different software from different manufacturers. Therefore, the deployment and access of the traveling wave ranging master station need to be considered in practical applications. Summary of the invention

[0005] The present invention aims to at least solve the problem that the fault position of the distribution line cannot be accurately located.

[0006] Therefore, the first object of the present invention is to provide a distribution line fault location system based on directional traveling waves.

[0007] The technical solution of the first aspect of the present invention provides a distribution line fault location system based on directional traveling waves, including: multiple monitoring terminals, which are arranged on the distribution lines, the monitoring terminals include a current traveling wave acquisition unit and a voltage traveling wave acquisition unit, the current traveling wave acquisition unit is used to collect current traveling waves on the distribution lines, and the voltage traveling wave acquisition unit is used to collect voltage traveling waves on the distribution lines; a host computer, which can monitor the initial traveling wave time information of all monitoring terminals on the distribution lines, and is used to determine the fault location according to the voltage traveling waves and current traveling waves collected by multiple monitoring terminals, as well as the initial traveling wave time information.

[0008] The distribution line fault location system based on directional traveling waves provided by the present invention includes multiple monitoring terminals and a host computer. Multiple monitoring terminals are arranged on the distribution line, and the monitoring terminals include a current traveling wave acquisition unit and a voltage traveling wave acquisition unit. The current traveling wave acquisition unit can collect current traveling waves on the distribution line, and the voltage traveling wave acquisition unit can collect voltage traveling waves on the distribution line. The host computer can monitor the initial traveling wave time information of all monitoring terminals on the distribution line, so that the fault location can be determined according to the voltage traveling waves and current traveling waves collected by multiple monitoring terminals, as well as the initial traveling wave time information. The present application sets multiple monitoring terminals on the distribution line, and uses multiple monitoring terminals and traveling waves when a distribution line fails to determine the specific location of the fault, thereby solving the problem of accurate positioning of the distribution network, further shortening the fault finding time, and improving the power supply reliability of the distribution line.

[0009] In addition, the distribution line fault location system based on directional traveling waves provided in this application may also have the following additional technical features: In some embodiments, optionally, the host computer includes: a clock module, used to monitor the initial traveling wave time information of all monitoring terminals on the distribution line; a traveling wave determination module, used to determine the directional traveling waves on the distribution line based on the collected current traveling waves and voltage traveling waves; a fault determination module, used to determine the fault location based on the types of directional traveling waves of multiple monitoring terminals and the initial traveling wave time information.

[0010] In this embodiment, the host computer includes a clock module, a traveling wave determination module and a fault determination module. The clock module can monitor the initial traveling wave time information of all monitoring terminals on the distribution line. The traveling wave determination module can determine the directional traveling wave on the distribution line according to the collected current traveling wave and voltage traveling wave. The fault determination module can determine the fault location according to the type of directional traveling waves and the initial traveling wave time information of multiple monitoring terminals. By determining the fault location by the type of directional traveling waves and the initial traveling wave time information of multiple monitoring terminals, the fault location can be accurately located, shortening the fault finding time.

[0011] In some embodiments, optionally, the distribution line fault location system based on directional traveling waves also includes: a grouping module, used to number multiple monitoring terminals and group the multiple monitoring terminals to form multiple monitoring groups; a main terminal determination module, used to determine the main terminal of each monitoring group according to the number of the monitoring terminal in each monitoring group, the main terminal is connected to the host computer, and is used to communicate with the host computer and the monitoring terminals in the monitoring group except the main terminal.

[0012] In this embodiment, in order to further shorten the fault location time and reduce the amount of data processing, multiple monitoring terminals can be grouped, and then the master terminal in each monitoring group is used to communicate with the host computer and other monitoring terminals in the monitoring group, so that all monitoring terminals on the distribution line do not need to communicate with the host computer, which reduces the burden on the host computer and solves the problem of large communication data volume of the distribution network centralized ranging master terminal. Specifically, a grouping module can be set to number multiple monitoring terminals and group multiple monitoring terminals to form multiple monitoring groups. A master terminal determination module is set to determine the master terminal of each monitoring group according to the number of the monitoring terminal in each monitoring group.

[0013] In some embodiments, optionally, the fault determination module includes: a fault judgment module, used to determine the fault section of the distribution line according to the type of directional traveling waves of the main terminal in each monitoring group, and the type of directional traveling waves of all monitoring terminals except the main terminal in each monitoring group; a ranging module, used to determine the distance from the fault location to the main terminal in the fault section according to the distance from the main terminal to the monitoring terminal in the fault section, the initial traveling wave time information and the propagation speed of the traveling wave.

[0014] In this embodiment, the fault determination module includes a fault judgment module and a distance measurement module. The fault judgment module can determine the fault section of the distribution line according to the type of directional traveling waves of the main terminal in each monitoring group and the type of directional traveling waves of all monitoring terminals except the main terminal in each monitoring group. The distance measurement module can determine the distance from the fault location to the main terminal in the fault section according to the distance from the main terminal to the monitoring terminal in the fault section, the initial traveling wave time information and the propagation speed of the traveling wave. It can be understood that the present application can determine not only the section where the fault occurs, but also the distance from the fault location to the main terminal in the fault section, so as to facilitate the staff to quickly repair the fault.

[0015] In some embodiments, optionally, the fault section includes multiple monitoring terminals other than the main terminal, the determined distances from the fault location to the main terminal in the fault section include multiple distances, and the main terminal is used to send the maximum distance among the multiple distances to the host computer.

[0016] In this embodiment, when there are multiple monitoring terminals other than the main terminal in the fault section, the determined distances from the fault location to the main terminal in the fault section also include multiple ones. At this time, the maximum distance among the multiple distances can be sent to the host computer through the main terminal. The maximum distance is the distance from the fault location to the main terminal in the fault section.

[0017] In some embodiments, optionally, the distance from the fault location to the main terminal in the fault section is specifically calculated using the following formula: ; Among them, P represents the location of the main terminal, F represents the location where the fault occurs, It represents the distance from the main terminal to the fault location, v represents the propagation speed of the traveling wave, L represents the distance from the main terminal to the monitoring terminal, Ta represents the time when the initial traveling wave reaches the main terminal, and Tb represents the time when the initial traveling wave reaches the monitoring terminal.

[0018] In some embodiments, optionally, the grouping module is specifically used to number multiple monitoring terminals according to the trunk lines and branch lines; the master terminal determination module is specifically used to determine the monitoring terminal with the smallest number as the master terminal.

[0019] In this embodiment, the grouping module is specifically used to number multiple monitoring terminals according to the trunk line and the branch line, specifically, the monitoring terminals of the trunk line are numbered first, and then the monitoring terminals of the branch line are numbered. The master terminal determination module is specifically used to determine the monitoring terminal with the smallest number as the master terminal.

[0020] In some embodiments, optionally, the grouping module is specifically used to number multiple monitoring terminals according to the distance from the monitoring terminal to the power supply end or the load end; wherein the number of the monitoring terminal close to the power supply end is smaller than the number of the monitoring terminal far away from the power supply end, and the number of the monitoring terminal close to the load end is larger than the number of the monitoring terminal far away from the load end; the main terminal determination module is specifically used to determine the monitoring terminal with the smallest number as the main terminal.

[0021] In this embodiment, the grouping module can determine the number according to the distance from the monitoring terminal to the power supply end or the load end. Among multiple monitoring terminals, the closer the monitoring terminal is to the power supply end, the smaller the number is, and vice versa, the closer the monitoring terminal is to the load end, the larger the number is. The master terminal determination module is specifically used to determine the monitoring terminal with the smallest number as the master terminal.

[0022] In some embodiments, optionally, the grouping module is specifically used to group multiple monitoring terminals according to the network topology relationship of the distribution lines to form multiple monitoring groups.

[0023] In this embodiment, the grouping module may group the multiple monitoring terminals according to the network topology relationship of the power distribution lines to form multiple monitoring groups.

[0024] In some embodiments, optionally, the host computer further includes: a display module for displaying fault location information; and an early warning module for issuing an early warning when a fault occurs in the distribution line.

[0025] In this embodiment, the host computer also includes a display module and an early warning module. The display module can display the fault location information, so that the staff can analyze and handle the fault location in time. The early warning module can issue an early warning when a distribution line fails, so as to avoid the situation where the staff cannot find the fault in time.

[0026] In some embodiments, optionally, the distribution line fault location system based on directional traveling waves also includes: a signal processing module for processing the detected voltage traveling waves and current traveling waves; a protection module for protecting the current traveling wave collection unit and the voltage traveling wave collection unit to prevent the current traveling wave collection unit and the voltage traveling wave collection unit from being affected by overload or short circuit.

[0027] In this embodiment, the distribution line fault location system based on directional traveling waves also includes a signal processing module and a protection module. The signal processing module can process the detected voltage traveling waves and current traveling waves. The protection module can protect the current traveling wave acquisition unit and the voltage traveling wave acquisition unit to prevent the current traveling wave acquisition unit and the voltage traveling wave acquisition unit from being affected by overload or short circuit.

[0028] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is one of the block diagrams of a distribution line fault location system based on directional traveling waves according to an embodiment of the present invention; Figure 2 is a second block diagram of a distribution line fault location system based on directional traveling waves according to an embodiment of the present invention; Figure 3 3 is a block diagram of a distribution line fault location system based on directional traveling waves according to an embodiment of the present invention; Figure 4 is a schematic diagram of traveling wave ranging according to an embodiment of the present invention; Figure 5 is a configuration diagram of a traveling wave ranging monitoring terminal according to an embodiment of the present invention; Figure 6 is one of the schematic diagrams of a power distribution line failure according to an embodiment of the present invention; Figure 7 This is a second schematic diagram of a power distribution line failure according to an embodiment of the present invention; Figure 8 is a third schematic diagram of a power distribution line failure according to an embodiment of the present invention; Fig. 9 is a fourth schematic diagram of a power distribution line failure according to an embodiment of the present invention; Fig.10 is a fifth schematic diagram of a power distribution line failure according to an embodiment of the present invention; Fig.11 This is the sixth schematic diagram of a distribution line failure according to an embodiment of the present invention.

[0030] in, Figures 1 to 3 The corresponding relationship between the reference numerals and the component names is as follows: 10 Distribution line fault location system based on directional traveling waves, 1 monitoring terminal, 12 current traveling wave acquisition unit, 14 voltage traveling wave acquisition unit, 2 host computer, 21 clock module, 22 traveling wave determination module, 23 fault determination module, 231 fault judgment module, 232 ranging module, 24 display module, 25 early warning module, 3 grouping module, 4 main terminal determination module, 5 distribution line. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0033] Refer to the following Figures 1 to 11 A distribution line fault location system based on directional traveling waves according to some embodiments of the present invention is described.

[0034] In one embodiment according to the first aspect of the present application, Figure 1 and Figure 2As shown, a distribution line fault location system 10 based on directional traveling waves is provided, comprising a plurality of monitoring terminals 1 and a host computer 2. The plurality of monitoring terminals 1 are arranged on the distribution line 5, and the monitoring terminal 1 comprises a current traveling wave acquisition unit 12 and a voltage traveling wave acquisition unit 14, wherein the current traveling wave acquisition unit 12 is used to acquire the current traveling wave on the distribution line 5, and the voltage traveling wave acquisition unit 14 is used to acquire the voltage traveling wave on the distribution line 5. The host computer 2 is capable of monitoring the initial traveling wave time information of all monitoring terminals 1 on the distribution line 5, and is used to determine the fault location according to the voltage traveling waves and current traveling waves acquired by the plurality of monitoring terminals 1, and the initial traveling wave time information.

[0035] The distribution line fault location system 10 based on directional traveling waves provided by the present invention includes multiple monitoring terminals 1 and a host computer 2. Multiple monitoring terminals 1 are arranged on the distribution line 5, and the monitoring terminal 1 includes a current traveling wave acquisition unit 12 and a voltage traveling wave acquisition unit 14. The current traveling wave acquisition unit 12 can collect the current traveling waves on the distribution line 5, and the voltage traveling wave acquisition unit 14 can collect the voltage traveling waves on the distribution line 5. The host computer 2 can monitor the initial traveling wave time information of all monitoring terminals 1 on the distribution line 5, so that the fault location can be determined according to the voltage traveling waves and current traveling waves collected by the multiple monitoring terminals 1, as well as the initial traveling wave time information. The present application sets multiple monitoring terminals 1 on the distribution line 5, and uses the multiple monitoring terminals 1 and the traveling waves when the distribution line 5 fails to determine the specific location of the fault, thereby solving the problem of accurate positioning of the distribution network, further shortening the fault finding time, and improving the power supply reliability of the distribution line 5.

[0036] In some embodiments, optionally, Figure 2 As shown, the host computer 2 includes: a clock module 21, which is used to monitor the initial traveling wave time information of all monitoring terminals 1 on the distribution line 5; a traveling wave determination module 22, which is used to determine the directional traveling wave on the distribution line 5 according to the collected current traveling wave and voltage traveling wave; a fault determination module 23, which is used to determine the fault location according to the type of directional traveling waves and the initial traveling wave time information of multiple monitoring terminals 1.

[0037] In this embodiment, the host computer 2 includes a clock module 21, a traveling wave determination module 22 and a fault determination module 23. The clock module 21 can monitor the initial traveling wave time information of all monitoring terminals 1 on the distribution line 5. The traveling wave determination module 22 can determine the directional traveling wave on the distribution line 5 based on the collected current traveling wave and voltage traveling wave. The fault determination module 23 can determine the fault location based on the type of directional traveling waves and the initial traveling wave time information of multiple monitoring terminals 1. By determining the fault location through the type of directional traveling waves and the initial traveling wave time information of multiple monitoring terminals 1, the fault location can be accurately located, shortening the fault finding time.

[0038] In some embodiments, optionally, the distribution line fault location system 10 based on directional traveling waves also includes: a grouping module 3, used to number multiple monitoring terminals 1, and group multiple monitoring terminals 1 to form multiple monitoring groups; a main terminal determination module 4, used to determine the main terminal of each monitoring group according to the number of the monitoring terminal 1 in each monitoring group, and the main terminal is connected to the host computer 2, and is used to communicate with the host computer 2 and the monitoring terminals 1 in the monitoring group except the main terminal.

[0039] In this embodiment, in order to further shorten the fault location time and reduce the amount of data processing, multiple monitoring terminals 1 can be grouped, and then the main terminal in each monitoring group is used to communicate with the host computer 2 and other monitoring terminals 1 in the monitoring group, so that it is not necessary for all monitoring terminals 1 on the distribution line 5 to communicate with the host computer 2, reducing the burden on the host computer 2 and solving the problem of large communication data volume of the distribution network centralized ranging main terminal. Specifically, a grouping module 3 can be set to number multiple monitoring terminals 1 and group multiple monitoring terminals 1 to form multiple monitoring groups. A main terminal determination module 4 is set to determine the main terminal of each monitoring group according to the number of the monitoring terminal 1 in each monitoring group.

[0040] In some embodiments, optionally, Figure 3 As shown, the fault determination module 23 includes: a fault judgment module 231, which is used to determine the fault section of the distribution line 5 according to the type of directional traveling waves of the main terminal in each monitoring group, and the type of directional traveling waves of all monitoring terminals 1 except the main terminal in each monitoring group; a distance measurement module 232, which is used to determine the distance from the fault position to the main terminal in the fault section according to the distance from the main terminal to the monitoring terminal 1 in the fault section, the initial traveling wave time information and the propagation speed of the traveling wave.

[0041] In this embodiment, the fault determination module 23 includes a fault judgment module 231 and a distance measurement module 232. The fault judgment module 231 can determine the fault section of the distribution line 5 according to the type of directional traveling waves of the main terminal in each monitoring group and the type of directional traveling waves of all monitoring terminals 1 except the main terminal in each monitoring group. The distance measurement module 232 can determine the distance from the fault location to the main terminal in the fault section according to the distance from the main terminal to the monitoring terminal 1 in the fault section, the initial traveling wave time information and the propagation speed of the traveling wave. It can be understood that the present application can determine not only the section where the fault occurs, but also the distance from the fault location to the main terminal in the fault section, so as to facilitate the staff to quickly repair the fault.

[0042] In some embodiments, optionally, the fault section includes multiple monitoring terminals 1 other than the main terminal, the determined distances from the fault location to the main terminal in the fault section include multiple distances, and the main terminal is used to send the maximum distance among the multiple distances to the host computer 2.

[0043] In this embodiment, when the fault section includes multiple monitoring terminals 1 in addition to the main terminal, the determined distances from the fault location to the main terminal in the fault section also include multiple ones. At this time, the maximum distance among the multiple distances can be sent to the host computer 2 through the main terminal. The maximum distance is the distance from the fault location to the main terminal in the fault section.

[0044] In some embodiments, optionally, the distance from the fault location to the main terminal in the fault section is specifically calculated using the following formula: ; Among them, P represents the location of the main terminal, F represents the location where the fault occurs, and D PF It represents the distance from the main terminal to the fault location, v represents the propagation speed of the traveling wave, L represents the distance from the main terminal to the monitoring terminal 1, Ta represents the time when the initial traveling wave arrives at the main terminal, and Tb represents the time when the initial traveling wave arrives at the monitoring terminal 1.

[0045] In some embodiments, optionally, the grouping module 3 is specifically used to number multiple monitoring terminals 1 according to the trunk lines and branch lines; the master terminal determination module 4 is specifically used to determine the monitoring terminal 1 with the smallest number as the master terminal.

[0046] In this embodiment, the grouping module 3 is specifically used to number the multiple monitoring terminals 1 according to the trunk line and the branch line. Specifically, the monitoring terminals 1 of the trunk line are numbered first, and then the monitoring terminals 1 of the branch line are numbered. The master terminal determination module 4 is specifically used to determine the monitoring terminal 1 with the smallest number as the master terminal.

[0047] In some embodiments, optionally, the grouping module 3 is specifically used to number multiple monitoring terminals 1 according to the distance from the monitoring terminal 1 to the power supply end or the load end; wherein the number of the monitoring terminal 1 close to the power supply end is smaller than the number of the monitoring terminal 1 far away from the power supply end, and the number of the monitoring terminal 1 close to the load end is larger than the number of the monitoring terminal 1 far away from the load end; the main terminal determination module 4 is specifically used to determine the monitoring terminal 1 with the smallest number as the main terminal.

[0048] In this embodiment, the grouping module 3 can determine the number according to the distance from the monitoring terminal 1 to the power supply end or the load end. Among the multiple monitoring terminals 1, the closer the monitoring terminal 1 is to the power supply end, the smaller the number is, and vice versa, the closer the monitoring terminal 1 is to the load end, the larger the number is. The master terminal determination module 4 is specifically used to determine the monitoring terminal 1 with the smallest number as the master terminal.

[0049] In some embodiments, optionally, the grouping module 3 is specifically used to group multiple monitoring terminals 1 according to the network topology relationship of the distribution line 5 to form multiple monitoring groups.

[0050] In this embodiment, the grouping module 3 can group the multiple monitoring terminals 1 according to the network topology relationship of the power distribution line 5 to form multiple monitoring groups.

[0051] In some embodiments, optionally, the host computer 2 further includes: a display module 24 for displaying fault location information; and an early warning module 25 for issuing an early warning when a fault occurs in the distribution line 5 .

[0052] In this embodiment, the host computer 2 also includes a display module 24 and an early warning module 25. The display module 24 can display the fault location information, so that the staff can analyze and process the fault location in time. The early warning module 25 can issue an early warning when a fault occurs in the distribution line 5 to avoid the situation where the staff cannot find the fault in time.

[0053] In some embodiments, optionally, the distribution line fault location system 10 based on directional traveling waves also includes: a signal processing module for processing the detected voltage traveling waves and current traveling waves; a protection module for protecting the current traveling wave collection unit 12 and the voltage traveling wave collection unit 14 to prevent the current traveling wave collection unit 12 and the voltage traveling wave collection unit 14 from being affected by overload or short circuit.

[0054] In this embodiment, the distribution line fault location system 10 based on directional traveling waves also includes a signal processing module and a protection module. The signal processing module can process the detected voltage traveling waves and current traveling waves. The protection module can protect the current traveling wave acquisition unit 12 and the voltage traveling wave acquisition unit 14 to prevent the current traveling wave acquisition unit 12 and the voltage traveling wave acquisition unit 14 from being affected by overload or short circuit.

[0055] Among them, Figure 4 As shown, the principle of the double-end traveling wave ranging of the present application is as follows: traveling wave ranging devices (monitoring terminals) are installed on both sides M and N of the fault line. After the fault occurs at point F, the traveling wave head generated at the fault point will propagate to both sides ( Figure 4 The arrows pointing to both sides of F indicate the propagation direction of the traveling wave). The times when the initial wave head arrives at the measuring ends on both sides are T1 and T2 respectively. According to the relationship between the line length and the fault distance, the following relationship holds: ; ; in, It represents the distance between M and F. It represents the distance between N and F, v represents the propagation speed of the traveling wave, and L represents the distance between M and N.

[0056] The following example illustrates this. Monitoring terminals are deployed at the head, middle and end of the main line of a 10kV line, located at the main #001 pole, #072 pole and #145 pole respectively. The main #002 pole has a branch. Monitoring terminals are deployed at the head and end of the branch, located at the #022 pole and #041 pole of the branch.

[0057] Number the terminals (monitoring terminals). Small numbers are placed in front and large numbers are placed in the back. The closer to the power source (substation), the smaller the number, and the closer to the load, the larger the number. Number the terminals on the trunk line first, and then number the terminals on the branch line. Based on this principle, the terminal numbering results are as follows: Figure 5 shown.

[0058] Directional traveling waves are constructed based on current traveling waves and voltage traveling waves. After a fault occurs, the initial traveling wave of the fault propagates to each terminal, the arrival time of the initial traveling wave of the fault is recorded, and the direction of the traveling wave is calculated. For the trunk line, it is stipulated that the bus points to the line as a forward traveling wave, and the line points to the bus as a reverse traveling wave. Under the above conditions, when the polarity of the initial voltage traveling wave is opposite to that of the initial current traveling wave, it is judged to be a reverse traveling wave. When the polarity of the initial current traveling wave and the initial voltage traveling wave are the same, it is a forward traveling wave. For branch lines, it is stipulated that the trunk line points to the branch line as a forward traveling wave, and the branch line points to the trunk line as a reverse traveling wave. Under the above conditions, when the polarity of the initial voltage traveling wave is opposite to that of the current traveling wave, it is judged to be a reverse traveling wave. When the polarity of the initial current traveling wave and the initial voltage traveling wave are the same, it is a forward traveling wave.

[0059] The terminals are grouped according to the network topology. ①②④ is a group, ②③ is a group, and ④⑤ is a group. The terminals in the same group will communicate with each other. The terminal with the smallest number in the same group is the master terminal. When the initial traveling wave of the fault detected by the master terminal is negative (reverse traveling wave), it will request data from other members in the group. When and only when the traveling waves of other members are positive (forward traveling wave), the master terminal determines that the fault is within the group, performs ranging calculation, and sends the maximum result of the ranging results to the distribution master station.

[0060] The specific instructions are as follows: After a fault occurs, the initial fault wave propagates from the fault point to all locations along the line. The time when the initial fault wave reaches terminal i is Ti. Each terminal records the arrival time Ti and the direction of the wave. When the direction of the wave is a forward wave, it is recorded as positive (+). When the direction of the wave is a reverse wave, it is recorded as negative (-).

[0061] The following example illustrates a failure scenario: 1. The fault point f is located between the main line poles #001 and #002.

[0062] like Figure 6 As shown in the figure, when the fault is located between the main line pole #001 and pole #002, ① detects that the traveling wave direction is negative, recorded as T1-, and ① requests data (traveling wave arrival time and direction) from ②④. The traveling wave directions of ②④ are both positive, recorded as T2+ and T4+, and ① determines that the fault is within the group and performs distance calculation.

[0063] According to T1, T2 and L12, the distance between the fault point and ① is calculated as: .

[0064] According to T1, T4 and L14, the distance between the fault point and ① is calculated as: .

[0065] In theory, Should be equal to .

[0066] Terminal ① uploads the distance measurement calculation results to the distribution master station (distribution automation master station).

[0067] 2. The fault point f is located between the main line poles #002 and #072.

[0068] like Figure 7 As shown, when the fault is located between the main line pole #002 and pole #072, the same as the above situation, ① determine that the fault is within the group and perform distance calculation.

[0069] According to T1, T4 and L14, the distance from the fault point to ① is calculated as the distance from the #001 pole to the #002 pole on the main line on L14. > Terminal ① uploads the maximum value of the ranging calculation result to the allocation master station.

[0070] 3. The fault point f is located before terminal ④ on the branch line.

[0071] like Figure 8 As shown in the figure, when the fault is located before terminal ④ on the branch line, ① determines that the fault is within the group and performs distance calculation. Based on T1, T2 and L12, the distance between the fault point and ① is calculated. It is the distance from pole #001 to pole #002 on the main line of L12. < Terminal ① takes the maximum value of the distance calculation result Upload to the distribution station.

[0072] 4. The fault point f is located between the main line poles #072 and #145.

[0073] like Fig. 9As shown in the figure, when the fault is located between the main line pole #072 and pole #145, ① detects that the traveling wave direction is negative, and ① requests data from ②④. The traveling wave directions of ②④ are one negative and one positive, and ① determines that the fault is not in the group, and does not perform distance calculation.

[0074] ② in ②③ detects that the traveling wave direction is negative, ② requests data from ③, the traveling wave direction of ③ is positive, ② determines that the fault is within the group and performs distance calculation.

[0075] According to T2, T3 and L23, the distance between the fault point and ② is calculated as: Terminal ② calculates the distance measurement result Upload to the distribution station.

[0076] 5. The fault point f is located between the branch line poles #022 and #041.

[0077] like Fig.10 As shown in the figure, when the fault is located between the branch line #022 and #041, ① detects that the traveling wave direction is negative, and ① requests data from ②④. The traveling wave directions of ②④ are one positive and one negative, and ① determines that the fault is not in the group, and does not perform distance calculation.

[0078] ④ in ④⑤ detects that the traveling wave direction is negative, ④ requests data from ⑤, the traveling wave direction of ⑤ is positive, ④ determines that the fault is within the group and performs distance calculation.

[0079] According to T4, T5 and L45, the distance between the fault point and ④ is calculated as: Terminal ④ calculates the distance measurement result Upload to the distribution station.

[0080] 6. If Fig.11 As shown in the figure, when the fault point f is located in the adjacent line, the directional traveling waves detected by terminals ①②③④⑤ are all positive, and it is judged that the fault is not in this line, and no ranging calculation is performed.

[0081] In one embodiment according to the second aspect of the present application, a distribution line fault location method based on directional traveling waves is provided, comprising: Step 1: Number each monitoring terminal.

[0082] Step 2: Group the numbered terminals according to the network topology, and the terminal with the smallest number in the group is the main terminal.

[0083] Step 3: Construct directional traveling wave based on current traveling wave and voltage traveling wave.

[0084] Step 4: The power system synchronizes the clock; when the directional wave of the master terminal is negative, it requests data from the group members and determines whether the fault is within the group based on the positive and negative directional waves of other members.

[0085] Step 5: When the directional traveling waves of other members are all positive, the fault is within the group, and distance measurement calculation is performed and the largest calculation result is uploaded to the distribution automation master station.

[0086] Through the technical solution of the present invention, a new method of distribution network traveling wave ranging of an on-site intelligent distributed lightweight master station using directional traveling waves is realized, which solves the problem of difficulty in accessing a centralized ranging master station in the distribution network, shortens the fault finding time, and improves the power supply reliability of the distribution line.

[0087] In one embodiment according to the second aspect of the present application, a distribution line fault location method based on directional traveling waves is provided, wherein the monitoring terminal is also a master station, the monitoring terminals communicate with each other, the terminals perform distance measurement calculations, and send the distance measurement results to the distribution automation master station. The distribution line fault location method based on directional traveling waves includes: Step 1: Number the monitoring terminals according to their distribution on the line. Small numbers are in front and large numbers are in the back. The closer to the power supply end, the smaller the number, and the closer to the load end, the larger the number. First number the monitoring terminals on the trunk line, and then number the monitoring terminals on the branch line.

[0088] Step 2: Construct a directional traveling wave based on the voltage traveling wave and the current traveling wave.

[0089] Step 3: Group the monitoring terminals according to the network topology. The monitoring terminal with the smallest number in the same group is the main terminal. The monitoring terminals that have a direct connection relationship with the main terminal are in this group.

[0090] Step 4: When the initial traveling wave of the fault detected by the master station is negative (reverse traveling wave), it will request data from other members in the group. If and only if the traveling waves of other members are all positive, the master terminal determines that the fault is within the group, performs distance measurement calculation, and sends the maximum result of the distance measurement results to the distribution automation master station.

[0091] An embodiment of the third aspect of the present invention provides a distribution line fault location device based on directional traveling waves, comprising: a memory and a processor, the memory storing a program or instruction, and when the program or instruction is executed by the processor, the steps of the distribution line fault location method based on directional traveling waves as in any one of the embodiments of the second aspect are implemented.

[0092] The distribution line fault location device based on directional traveling waves provided by the present invention includes a memory and a processor, the memory stores a program or instruction, and when the program or instruction is executed by the processor, the steps of the distribution line fault location method based on directional traveling waves in any embodiment of the second aspect are implemented. Since the distribution line fault location device based on directional traveling waves can implement the steps of the distribution line fault location method based on directional traveling waves in any embodiment of the second aspect. Therefore, the distribution line fault location device based on directional traveling waves provided by the present invention also has all the beneficial effects of the distribution line fault location method based on directional traveling waves in any embodiment of the second aspect, which will not be repeated here.

[0093] An embodiment of the fourth aspect of the present invention provides a storage medium on which a program or instruction is stored. When the program or instruction is executed, the steps of the distribution line fault location method based on directional traveling waves in any embodiment of the second aspect are implemented.

[0094] According to the storage medium provided by the present invention, a program or instruction is stored thereon, and when the program or instruction is executed, the steps of the distribution line fault location method based on directional traveling waves in any embodiment of the second aspect are implemented. Since the storage medium can implement the steps of the distribution line fault location method based on directional traveling waves in any embodiment of the second aspect. Therefore, the storage medium provided by the present invention also has all the beneficial effects of the distribution line fault location method based on directional traveling waves in any embodiment of the second aspect, which will not be repeated here.

[0095] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0096] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0097] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0098] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A distribution line fault location system based on directional traveling waves, characterized in that: include: A plurality of monitoring terminals are arranged on the distribution line, wherein the monitoring terminals include a current traveling wave acquisition unit and a voltage traveling wave acquisition unit, wherein the current traveling wave acquisition unit is used to acquire the current traveling wave on the distribution line, and the voltage traveling wave acquisition unit is used to acquire the voltage traveling wave on the distribution line; The host computer can monitor the initial traveling wave time information of all the monitoring terminals on the distribution line, and is used to determine the fault location based on the voltage traveling wave and the current traveling wave collected by multiple monitoring terminals, and the initial traveling wave time information.

2. The distribution line fault location system based on directional traveling waves according to claim 1 is characterized in that: The host computer comprises: A clock module, used for monitoring the initial traveling wave time information of all the monitoring terminals on the distribution line; A traveling wave determination module, used to determine a directional traveling wave on the distribution line according to the collected current traveling wave and voltage traveling wave; A fault determination module is used to determine the fault location according to the types of the directional traveling waves of the plurality of monitoring terminals and the initial traveling wave time information.

3. The distribution line fault location system based on directional traveling waves according to claim 2 is characterized in that: Also includes: A grouping module, used for numbering the plurality of monitoring terminals and grouping the plurality of monitoring terminals to form a plurality of monitoring groups; The main terminal determination module is used to determine the main terminal of each monitoring group according to the number of the monitoring terminal in each monitoring group. The main terminal is connected to the host computer and is used to communicate with the host computer and the monitoring terminals in the monitoring group except the main terminal.

4. The distribution line fault location system based on directional traveling waves according to claim 3 is characterized in that: The fault determination module comprises: A fault judgment module, used for determining the fault section of the distribution line according to the type of the directional traveling wave of the main terminal in each monitoring group and the type of the directional traveling wave of all the monitoring terminals except the main terminal in each monitoring group; The distance measuring module is used to determine the distance from the fault location to the main terminal in the fault section according to the distance from the main terminal to the monitoring terminal in the fault section, the initial traveling wave time information and the propagation speed of the traveling wave.

5. The distribution line fault location system based on directional traveling waves according to claim 4 is characterized in that: The fault section includes multiple monitoring terminals other than the main terminal, the determined distances from the fault location to the main terminal in the fault section include multiple distances, and the main terminal is used to send the maximum distance among the multiple distances to the host computer.

6. The distribution line fault location system based on directional traveling waves according to claim 4 is characterized in that: The distance from the fault location to the main terminal in the fault section is specifically calculated using the following formula: ; Among them, P represents the location of the main terminal, F represents the location where the fault occurs, and D PF It represents the distance from the main terminal to the fault location, v represents the propagation speed of the traveling wave, L represents the distance from the main terminal to the monitoring terminal, Ta represents the time when the initial traveling wave reaches the main terminal, and Tb represents the time when the initial traveling wave reaches the monitoring terminal.

7. The distribution line fault location system based on directional traveling waves according to claim 3 is characterized in that: The grouping module is specifically used to number the plurality of monitoring terminals according to the trunk line and the branch line; The master terminal determination module is specifically configured to determine the monitoring terminal with the smallest number as the master terminal.

8. The distribution line fault location system based on directional traveling waves according to claim 3 is characterized in that: The grouping module is specifically used to number the plurality of monitoring terminals according to the distance from the monitoring terminal to the power supply end or the load end; The number of the monitoring terminal close to the power supply end is smaller than the number of the monitoring terminal far from the power supply end, and the number of the monitoring terminal close to the load end is larger than the number of the monitoring terminal far from the load end; The master terminal determination module is specifically configured to determine the monitoring terminal with the smallest number as the master terminal.

9. The distribution line fault location system based on directional traveling waves according to claim 3, characterized in that: The grouping module is specifically used to group the plurality of monitoring terminals according to the network topology relationship of the power distribution line to form a plurality of monitoring groups.

10. The distribution line fault location system based on directional traveling waves according to any one of claims 1 to 9, characterized in that: The host computer also includes: A display module, used for displaying fault location information; The early warning module is used to issue an early warning when a fault occurs in the power distribution line.

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