Method for identifying fault location in loop-type power network, electronic device, and program

Abstract

The embodiment of the present invention discloses a method and related equipment for fault location in a loop-type power network. The method includes the steps of: constructing a plurality of reference coordinate systems by expanding each loop-type line segment with an arbitrary point as the coordinate origin in the loop-type power network; acquiring monitoring point coordinate information and crest arrival time of each of the monitoring sites in each of the reference coordinate systems; acquiring assumed fault point information; acquiring the propagation speed of a traveling wave; constructing a plurality of simultaneous equations for distributed fault location based on the monitoring point coordinate information, the crest arrival time information, the assumed fault point information and the propagation speed of the traveling wave in each of the reference coordinate systems; and identifying the actual location of the fault based on the solution of the simultaneous equations for distributed fault location and the assumed fault section. The method provided by the present invention compensates for the deficiencies of location identification by both-end traveling waves in loop-type network location identification, and provides a reliable, economical and accurate fault location method for loop-type complex AC / DC transmission and distribution lines.

Description

[Technical field]

[0001] The present invention relates to the field of loop-type power network technology, and in particular to a fault location method and related equipment for loop-type power network. [Background technology]

[0002] In the power system, AC / DC transmission and distribution lines are important components, and line faults affect the stability of the system, causing power supply interruptions to consumers, and the fault points require time and effort to be located manually. A fast and accurate line fault location technique is favorable for timely repair of the fault line, reducing the economic losses caused by power outages and easing the pain of manually inspecting the lines. There are two main types of power system fault location techniques: impedance method and traveling wave method. The impedance method is easily affected by factors such as fault resistance, transformer error, and power supply parameters, and the actual application effect is not ideal. The traveling wave method has a simple principle and high accuracy, so it is widely used in power systems. However, in the traveling wave method, the wave speed in the cable is not fixed, and the loss of traveling wave information will result in failure of location determination; for a loop-type power network, traveling waves propagate in the loop-type network, and fault location determination needs to be coordinated with the analysis of the tripping status of the line breaker, making it difficult to realize area location; multiple sets of traveling wave location devices are required; and if the signal of any of the traveling wave location devices is lost, traveling wave location will fail.

[0003] For example, the following is exemplified in Patent Document 1:Current distributed fault location technology has good potential for engineering application. It can locate the fault by using the sensor in the fault section and the adjacent sensors, and can eliminate the influence of wave speed. However, it is necessary to first determine the fault section, and the equation for fault location is complex. The equation for determining the location at the start and end and the equation for determining the fault location along the line are not unified. The calculation method for fault location using traveling waves is very likely to cause failure in fault location because, for a loop-type power network, the traveling wave propagates from the fault point to both sides, and the traveling waves detected by the traveling wave monitoring sensors at both ends of a line segment are respectively the traveling waves on both sides of the fault point. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Chinese Patent No. 103823156 Summary of the Invention [Problem to be solved by the invention]

[0005] A series of simplified form concepts introduced in the Summary of the Invention section will be explained in more detail in the Detailed Description of the Invention section. The Summary of the Invention section is not intended to limit the key features and necessary technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution. [Means for solving the problem]

[0006] In order to further improve the accuracy and reliability of traveling wave location in a loop-type power network, in a first aspect, the present invention provides a method for fault location in a loop-type power network, the method comprising: A step of constructing a plurality of reference coordinate systems by expanding each loop-type line segment in a loop-type power network with an arbitrary point as a coordinate origin, the loop-type line segment being a line segment between two adjacent monitoring sites; acquiring monitoring point coordinate information and wave crest arrival time of each of the monitoring sites in each of the reference coordinate systems; A step of acquiring assumed fault point information, the assumed fault point information including assumed fault point coordinates, assumed fault occurrence time, and assumed fault section; Obtaining a propagation velocity of a traveling wave; A step of constructing a plurality of simultaneous equations for distributed fault location identification based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information and the propagation speed of the traveling wave in each of the reference coordinate systems; and determining an actual location of the fault based on the results of solving the simultaneous equations of the distributed fault location determination and the fault assumption interval.

[0007] Optionally, the fault assumption section includes a first assumption section of the fault, the reference coordinate system includes a first reference coordinate system, the plurality of distributed fault location simultaneous equations include a first distributed fault location simultaneous equation, and the first distributed fault location simultaneous equations are determined based on the first assumption section of the fault, the propagation speed of the traveling wave, the coordinate information of the monitoring site in the first reference coordinate system, and the wave crest arrival time information; The step of identifying an actual location of a fault based on the result of solving the simultaneous equations of the distributed fault location identification and the fault assumption section includes: solving a first distributed fault location system of equations to determine a first hypothetical location of the fault; If the first assumed location of the fault is located in the first assumed interval of the fault, setting the first assumed location of the fault as the actual location of the fault.

[0008] Optionally, the fault assumption section further includes a second assumption section of the fault, the reference coordinate system further includes a second reference coordinate system, the plurality of distributed fault location simultaneous equations further include a second distributed fault location simultaneous equation and a third distributed fault location simultaneous equation, the second distributed fault location simultaneous equation is determined based on the second assumption section of the fault, the propagation speed of the traveling wave, the coordinate information of the monitoring site in the first reference coordinate system and the wave front arrival time information, and the third distributed fault location simultaneous equation is determined based on the first assumption section of the fault, the propagation speed of the traveling wave, the coordinate information of the monitoring site in the second reference coordinate system and the wave front arrival time information; The method further comprises: if the first assumed location of the fault is outside the first assumed interval of the fault, solving a second distributed fault location system to determine a second assumed location of the fault; if the second assumed location of the fault is located in the second assumed fault section, determining the second assumed location of the fault as the actual location of the fault; Or, if the first assumed location of the fault is outside the first assumed interval of the fault, solving a third distributed fault location system to determine a third assumed location of the fault; if the third assumed location of the fault is located in the first assumed section of the fault, determining the third assumed location of the fault as the actual location of the fault.

[0009] The step of selectively constructing a plurality of distributed fault location simultaneous equations based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information, and the propagation speed of the traveling wave in each of the reference coordinate systems, includes: constructing a generalized simultaneous equation system for fault location; A step of constructing a plurality of distributed fault location identification simultaneous equations based on the general-purpose simultaneous equations for fault location identification, the monitoring point coordinate information in each of the reference coordinate systems, the wave crest arrival time information, the fault assumption section, and the propagation speed of the traveling wave, the general-purpose simultaneous equations for fault location identification being as follows:

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[0010] The step of selectively constructing a plurality of distributed fault location simultaneous equations based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information, and the propagation speed of the traveling wave in each of the reference coordinate systems, includes: constructing a default simultaneous equation for fault location when the wave crest arrival time is missing at some monitoring sites; A step of constructing a plurality of distributed fault location simultaneous equations based on the default simultaneous equations for fault location identification, the monitoring point coordinate information in each of the acquired reference coordinate systems, the wave crest arrival time information, the fault assumption section, and the propagation speed of the traveling wave, wherein the default simultaneous equations for fault location identification are as follows:

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[0011] Optionally, the monitoring points are provided at one or more of the following locations: a connection point between a busbar and a line, a connection point between a cable of a different line type and an overhead line, a connection point between two lines of different wire diameters, and a section where the line length is longer than a preset length and needs to be accurately located; a traveling wave crest monitoring sensor is provided at the monitoring site, and the traveling wave crest monitoring sensor is used to determine the crest arrival time of the corresponding monitoring point, and the traveling wave crest monitoring sensor includes a current type and a voltage type.

[0012] Optionally, the step of identifying an actual location of a fault based on the solution of each of the distributed fault location simultaneous equations and the fault assumption interval comprises: When the results of solving one of the simultaneous equations for distributed fault location identification are all within the fault section, the step of identifying the actual location of the fault using a mathematical statistical method based on the results of the solution is included, and the data statistical method includes at least one of the average method, the least square method, the variance method, and the mathematical expectation method.

[0013] In a second aspect, the present invention provides a method for producing a composition comprising the steps of: A first construction unit for constructing a plurality of reference coordinate systems by expanding each loop-type line segment in a loop-type power network with an arbitrary point as a coordinate origin, the first construction unit being a line segment between two adjacent monitoring sites; A first acquisition unit for acquiring monitoring point coordinate information and wave crest arrival time of each of the monitoring sites in each of the reference coordinate systems; A second acquisition unit for acquiring assumed fault point information, the assumed fault point information including fault point assumed coordinates, assumed fault occurrence time and assumed fault section; a third acquisition unit for acquiring the propagation velocity of the traveling wave; A second construction unit for constructing a plurality of distributed fault location simultaneous equations according to the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information and the propagation speed of the traveling wave in each of the reference coordinate systems; The present invention further provides a fault location apparatus for a loop-type power network, the apparatus including: a location unit for determining an actual location of a fault based on the solution of each of the distributed fault location simultaneous equations and the fault assumption section.

[0014] A third aspect is an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable by the processor, the processor being used to implement steps of the method for locating a fault in a loop power network of any one of the first aspects when executing the computer program stored in the memory.

[0015] In a fourth aspect, the present invention further provides a computer readable storage medium having a computer program stored thereon, the computer readable storage medium realizing the method for locating a fault in a loop power network according to any one of the first aspect when the computer program is executed by a processor. Effect of the Invention

[0016] The practice of the embodiments of the present invention has the following beneficial effects. The above-mentioned method for identifying the fault location of a loop-type power network is used to expand a loop-type power network to construct a reference coordinate system, and assuming that the traveling wave monitoring sensors at both ends of a certain line segment detect the traveling waves on both sides of the fault point, the line segment is expanded, and the crest arrival time and coordinates of the traveling wave crest monitoring sensors are used to calculate the fault point location coordinates, thereby making up for the insufficiency of the location identification by the traveling waves at both ends in identifying the loop-type network location. A reliable, economical and accurate fault location method is provided for a complex loop-type AC / DC transmission and distribution line, and the equation for identifying the fault location of a loop-type network power line is convenient for computer analysis, optimizing the current traveling wave location technology. In addition, the equation for identifying the fault location of a loop-type line is simple and reliable, and the current traveling wave location method requires the installation of a traveling wave location device at both ends of each line for the loop-type network. [Brief description of the drawings]

[0017] In the following, in order to more clearly explain the embodiments of the present invention or the technical solutions in the prior art, drawings that need to be used in the description of the embodiments or the prior art are briefly introduced; obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can further derive other drawings from these drawings without any creative efforts.

[0018] [Figure 1] FIG. 2 is a schematic diagram of a flow chart of a fault location method for a loop-type power network provided in an embodiment of the present invention; [Diagram 2] 1 is a schematic diagram of a loop-type power network provided in an embodiment of the present invention. [Diagram 3] FIG. 2 is a schematic diagram of one possible reference coordinate system provided in an embodiment of the present invention. [Figure 4] 2A-2C are schematic diagrams of two possible reference coordinate systems provided in an embodiment of the present invention; [Diagram 5] 2A-2C are schematic diagrams of three possible reference coordinate systems provided in an embodiment of the present invention; [Figure 6] 1A-1C are schematic diagrams of four possible reference coordinate systems provided in an embodiment of the present invention. [Figure 7] 1A-1D are schematic diagrams of five possible reference coordinate systems provided in an embodiment of the present invention. [Figure 8] FIG. 2 is a schematic diagram of one possible fault point assumption location provided in an embodiment of the present invention. [Figure 9] FIG. 13 is a schematic diagram of another possible fault point assumption location provided in an embodiment of the present invention. [Figure 10] FIG. 2 is a schematic diagram of the structure of a fault locating device for a loop-type power network provided in an embodiment of the present invention; [Figure 11] FIG. 2 is a schematic diagram of an electronic device structure for fault location in a loop-type power network provided in an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] The following clearly and completely describes the technical solutions in the embodiments of the present invention in accordance with the drawings in the embodiments of the present invention, but obviously, the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments that can be obtained by those skilled in the art without any creative efforts are within the scope of protection of the present invention.

[0020] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the drawings above are used to distinguish between similar objects and are not necessarily used to describe a particular order or sequence. It should be understood that the data used in this manner may be interchanged under appropriate circumstances so that the embodiments described herein are performed in an order other than that shown or described herein. Furthermore, the terms "comprise" and "have", as well as any variations thereof, are intended to cover a non-exclusive inclusion, e.g., a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are expressly recited, but may include other steps or units that are not expressly recited or inherent to these processes, methods, products, or devices. Hereinafter, the technical solutions in the embodiments of the present invention will be described clearly and completely in accordance with the drawings in the embodiments of the present invention, but obviously, the described embodiments are only some embodiments, not all embodiments.

[0021] As shown in FIG. 1, a flow diagram of a fault location method for a loop power network provided in an embodiment of the present invention can specifically include the following S110 to S160.

[0022] In S110, an arbitrary point in the loop-type power network is set as the coordinate origin to construct multiple reference coordinate systems by expanding each loop-type line segment, where the loop-type line segment is a line segment between two adjacent monitoring sites.

[0023] For example, a loop-type power network is composed of multiple buses and lines. As shown in FIG. 2, which is a schematic diagram of one possible loop-type power network, the schematic diagram includes bus 11, bus 12, bus 13, bus 14, bus 15 and line 2, and line 2 is composed of a total of seven segments, L1, L2...L7. As shown in FIG. 2, monitoring sites are provided at the connection points between the buses and the loop-type lines, and may also be provided at the connection points between cables of different line types and overhead lines, the connection points between two lines with different wire diameters, and sections where the line length is longer than a preset length and needs to be accurately located. The number of monitoring sites can be appropriately adjusted based on the specific structure of the loop-type line and the required accuracy requirements for fault location. A loop-type line segment is a line segment between two adjacent monitoring sites, and the loop-type power network shown in Figure 2 includes a total of five loop-type line segments, including L1+L2 segment, L3+L4 segment, L5 segment, L6 segment, and L7 segment, and accordingly, this loop-type power network has five types of deployment forms, and the coordinate origin can be arbitrarily selected, and is preferably located at the monitoring site. Note that the deployment forms of the loop-type line are not limited to five types, and this embodiment can only take Figure 2 as an example to better explain this solution, and the specific deployment forms and deployment numbers are determined according to the number of monitoring sites in the actual loop-type line.

[0024] In S120, the monitoring point coordinate information and the wave crest arrival time of each of the monitoring sites in each of the reference coordinate systems are obtained.

[0025] For example, the crest arrival time can be obtained by installing a traveling wave crest sensor at the monitoring site, and the crest monitoring sensor can be a current type or a voltage type. In the loop-type power supply line shown in Figure 2, a total of five sensors are installed on the loop-type line, and these five sensors are used to measure the crest arrival time of the traveling wave. The traveling wave crest sensor can transmit the measured traveling wave to the back-end positioning host by wired or wireless communication, and the positioning host processes the waveform, thereby obtaining the crest arrival time of the monitoring site. When the sensor is installed, it has a fixed position on the loop-type line, but it may include multiple types due to different deployment methods of the loop-type power network and various selection methods of the coordinate origin.

[0026] In one possible embodiment, the monitoring point coordinate information in the reference coordinate system of the target monitoring site of the monitoring site can be obtained, and the lengths L1, L2, L3, L4, L5, L6, and L7 of the crest monitoring sensor 3 of the traveling wave of the power network along the line 2 can be obtained based on Figure 2. Assuming that the monitoring site corresponding to the sensor on the busbar 11 side is the coordinate origin, the coordinates of the point are expressed as (x0, t0), where x0 = 0.

[0027] The first possible reference coordinate system shown in FIG. 3 is for deploying a loop-type power network on the line L7 segment, and the coordinate positions of the crest monitoring sensors of each traveling wave distributed along the loop-type power network line are written as (x1, t1), (x2, t2), (x3, t3), and (x4, t4), where x1=L1+L2, x2=L1+L2+L3+L4, x3=L1+L2+L3+L4+L5, and x4=L1+L2+L3+L4+L5+L6, and x1, x2, x3, and x4 are the detection point coordinate information, and t1, t2, t3, and t4 are the crest arrival times.

[0028] The second possible reference coordinate system shown in FIG. 4 is for deploying a loop-type power network on the line L6 segment, and the coordinate positions of the crest monitoring sensors of each traveling wave distributed along the loop-type power network line are written as (x1, t1), (x2, t2), (x3, t3), and (x4, t4), where x1=L1+L2, x2=L1+L2+L3+L4, x3=L1+L2+L3+L4+L5, and x4=-L7, and x1, x2, x3, and x4 are the detection point coordinate information, and t1, t2, t3, and t4 are the crest arrival times.

[0029] The third possible reference coordinate system shown in Figure 5 is for deploying a loop-type power network on the line L5 segment, and the coordinate positions of the crest monitoring sensors of each traveling wave distributed along the loop-type power network line are written as (x1, t1), (x2, t2), (x3, t3), and (x4, t4), where x1=L1+L2, x2=L1+L2+L3+L4, x3=-L6-L7, and x4=-L7, where x1, x2, x3, and x4 are the detection point coordinate information, and t1, t2, t3, and t4 are the crest arrival times.

[0030] The fourth possible reference coordinate system shown in Figure 6 is for deploying a loop-type power network on the line L3 and L4 segments, and the coordinate positions of the crest monitoring sensors of each traveling wave distributed along the loop-type power network line are written as (x1, t1), (x2, t2), (x3, t3), and (x4, t4), where x1=L1+L2, x2=-L5-L6-L7, x3=-L6-L7, and x4=-L7, and x1, x2, x3, and x4 are the detection point coordinate information, and t1, t2, t3, and t4 are the crest arrival times.

[0031] The fifth possible reference coordinate system shown in FIG. 7 is for deploying a loop-type power network on the line L1 and L2 segments, and the coordinate positions of the crest monitoring sensors of each traveling wave distributed along the loop-type power network line are written as (x1, t1), (x2, t2), (x3, t3), and (x4, t4), where x1=-L3-L4-L5-L6-L7, x2=-L5-L6-L7, x3=-L6-L7, and x4=-L7, and x1, x2, x3, and x4 are the detection point coordinate information, and t1, t2, t3, and t4 are the crest arrival times.

[0032] In S130, assumed fault point information is obtained, where the assumed fault point information includes assumed fault point coordinates, assumed fault occurrence time and assumed fault section.

[0033] For example, the first assumed section of the fault can be arbitrarily assumed, for example, it appears in any one of the segments L1 and L2 or L3+L4, L5, L6, and L7. The assumed fault point information includes an assumed fault point coordinate x, an assumed fault occurrence time t, and an assumed fault section.

[0034] In S140, the propagation velocity of the traveling wave is acquired.

[0035] For example, the propagation speed of the traveling wave is related to the type of loop-type power network: for an overhead line, the propagation speed of the traveling wave in each of the loop-type line segments in the line is the same, and one speed needs to be determined based on the type of line; for a hybrid loop-type power line, the propagation speed of the traveling wave in each of the loop-type line segments is different, and the propagation speed of the traveling wave in each of the loop-type line segments needs to be determined.

[0036] In S150, a plurality of simultaneous equations for distributed fault location identification are constructed based on the monitoring point coordinate information in each of the reference coordinate systems, the wave crest arrival time information, the assumed fault point information and the propagation speed of the traveling wave.

[0037] For example, the simultaneous equations of distributed fault location are constructed according to the detection point coordinate information, wave front arrival time information, assumed fault point information and the propagation speed of the traveling wave in the reference coordinate system, and the expansion position of the constructed reference coordinate system in the loop-type power network is different, so that the assumed fault point information is different, and multiple simultaneous equations of distributed fault location are formed. Still, take the loop-type power network shown in Figure 2 as an example, there are five possible reference coordinate systems that can be established, and there are four possible assumed fault sections (because the reference coordinate system is expanded in one of the loop-type line segments, the assumed fault point cannot be in the expanded segment in this reference coordinate system), and when the coordinate system origin is determined, each assumed fault section and each reference coordinate system can obtain the assumed fault position, that is, a total of 20 simultaneous equations of distributed fault location may be generated.

[0038] In S160, the actual location of the fault is identified based on the results of solving the simultaneous equations for each of the distributed fault location identification and the fault assumption section.

[0039] For example, the simultaneous equations of distributed fault location are solved, and the solved results are compared with the assumed fault interval. Only when the solved results of the simultaneous equations of fault location are all within the assumed fault interval, the simultaneous equations of fault location are the simultaneous equations of fault location corresponding to the actual location of the fault. That is, only when there is only one specific reference coordinate system and the assumed fault region is accurately selected, the solved results can be within the assumed fault interval, and the solved results can be used to identify the actual location of the fault. Therefore, the equations of distributed fault location are solved, and the solved results are compared with the assumed fault interval. Only when the solved results are all within the assumed fault interval, the obtained results are the actual location of the fault. Still, taking the loop-type power network shown in FIG. 2 as an example, the actual location of the fault can be found at least once and at most 20 times.

[0040] In summary, the method provided in the embodiment of the present invention deploys a loop-type power network, constructs a reference coordinate system, and assumes that the traveling wave monitoring sensors at both ends of a certain line segment detect the traveling waves on both sides of the fault point, deploys the line segment, and uses the crest arrival time and coordinates of the traveling wave crest monitoring sensors to calculate the fault point location coordinate, thereby making up for the shortcomings of the two-end traveling wave location method for loop-type network location. A reliable, economical and accurate fault location method is provided for a complex loop-type AC / DC transmission and distribution line, and the equation for fault location of a loop-type network power line is convenient for computer analysis, optimizing the current traveling wave location technology. In addition, the equation for fault location of a loop-type line is simple and reliable, and the current traveling wave location method needs to install a traveling wave location device at both ends of each line for a loop-type network.

[0041] In some examples, the fault assumption section includes a first assumption section of the fault, the reference coordinate system includes a first reference coordinate system, the plurality of distributed fault location simultaneous equations include a first distributed fault location simultaneous equation, and the first distributed fault location simultaneous equations are determined based on the first assumption section of the fault, the propagation speed of the traveling wave, coordinate information of the monitoring site in the first reference coordinate system, and the wave front arrival time information; The step of identifying an actual location of a fault based on the result of solving the simultaneous equations of the distributed fault location identification and the fault assumption section includes: solving a first distributed fault location system of equations to determine a first hypothetical location of the fault; If the first assumed location of the fault is located in the first assumed interval of the fault, setting the first assumed location of the fault as the actual location of the fault.

[0042] For example, the reference coordinate system has multiple forms according to the deployment position, the assumed fault section can be a line between any two adjacent detection sites, the first reference coordinate system is one of the multiple forms, the first assumed fault section is on the line between the two adjacent detection sites, and the first distributed fault localization simultaneous equations are determined according to the first assumed fault section, the propagation speed of the traveling wave, the coordinate information of the detection site in the first reference coordinate system and the wave front arrival time. The first distributed fault localization simultaneous equations are solved, and the obtained result is the first assumed location of the fault, and if the coordinate of the first assumed location of the fault is located in the first assumed section of the fault, the selected reference coordinate system and the assumed fault location section are accurate, and the actual location of the fault can be identified using the solution result of the first distributed fault localization equations.

[0043] In some possible embodiments, as shown in the schematic diagram of a possible fault point assumption location in FIG. 8, a first reference coordinate system is developed by developing a loop-type power network in the line L7 segment, and a first assumed fault location section is located between x2 and x3. Based on the first assumed section of the fault and the general-purpose simultaneous equations of fault location, a first distributed location simultaneous equation is determined as shown in Equation (A):

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[0044] In addition, different overhead line systems may have different propagation velocities of the corresponding traveling waves. For a pure overhead line, v 01 =v 02 =v 12 =v 34 and v=v01 =v 02 =v 12 =v 34 , the coordinates of each sensor position and the time when the traveling wave crest reaches the sensor are substituted into the following equation, x 03 , x 04 , x 13 , x 14 , x 23 , x 24 Find the solution.

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[0045] In the case of a hybrid loop type power line, v ≠ v 01 ≠v 02 ≠v 12 ≠v 34 and v 01 , v 12 , v 34 Substituting into the formula below, v 23 , x 03 , x 04 , x 13 , x 14 , x 23 , x 24 Find the solution.

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[0046] In some examples, the fault assumption section further includes a second assumption section of the fault, the reference coordinate system further includes a second reference coordinate system, the plurality of distributed fault location simultaneous equations further include a second distributed fault location simultaneous equation and a third distributed fault location simultaneous equation, the second distributed fault location simultaneous equation is determined based on the second assumption section of the fault, the propagation speed of the traveling wave, the coordinate information of the monitoring site in the first reference coordinate system and the wave front arrival time information, and the third distributed fault location simultaneous equation is determined based on the first assumption section of the fault, the propagation speed of the traveling wave, the coordinate information of the monitoring site in the second reference coordinate system and the wave front arrival time information; The method further comprises: if the first assumed location of the fault is outside the first assumed interval of the fault, solving a second distributed fault location system to determine a second assumed location of the fault; if the second assumed location of the fault is located in the second assumed fault section, determining the second assumed location of the fault as the actual location of the fault; Or, if the first assumed location of the fault is outside the first assumed interval of the fault, solving a third distributed fault location system to determine a third assumed location of the fault; if the third assumed location of the fault is located in the first assumed section of the fault, determining the third assumed location of the fault as the actual location of the fault.

[0047] For example, if the first assumed location obtained is located outside the assumed fault section, the selected assumed section may not be the actual fault occurrence location and / or the selected expansion position of the loop-type circuit network may be incorrect, and another assumed fault section should be selected to determine a second distributed fault location simultaneous equation until the second assumed location is in the second assumed section of the fault, or a second reference coordinate system corresponding to another expansion form should be selected, and the second assumed location should be obtained based on the second reference coordinate system.

[0048] In some possible embodiments, the fault location is determined by the following method.

[0049] In S210, a first reference coordinate system is developed by developing a loop-type power network in the line L7 segment, and a first hypothetical section of the fault is located between x0 and x1, that is, it is assumed that the fault point appears between x0 and x1. When all the traveling wave crest sensors are normal, the equation of the first distributed fault location is as follows:

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[0050] In S220, the assumed fault section is changed, and the second assumed fault section is located between x1 and x2, that is, it is assumed that the fault point appears between x1 and x2. If all the traveling wave crest sensors are normal, the equation of the second distributed fault location is as follows:

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[0051] In S230, the position of the assumed fault section is changed again, and the second assumed fault section is located between x2 and x3, that is, it is assumed that the fault point appears between x2 and x3. If all the traveling wave crest sensors are normal, the equation of the second distributed fault location is as follows:

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[0052] As can be seen from step S210 to step S230, if the first assumed location of the fault is located outside the first assumed interval of the fault, i.e. the selected assumed interval may be wrong, obtain a second assumed interval by changing the assumed interval, establish a second distributed fault location equation, solve the second distributed fault location equation, and finish until the obtained results are all in the second assumed interval, i.e. the obtained results can be used to identify the actual location of the fault. As can be seen, the second assumed interval is not a single fault interval, but the remaining assumed interval apart from the first assumed interval of the fault.

[0053] In addition, if the first assumed location of the fault is located outside the first assumed interval of the fault, it may be caused by the selected deployment location, i.e. the selected reference coordinate system, changing the reference coordinate system to obtain a second reference coordinate system, establishing a third distributed fault location equation based on the second reference coordinate system, solving the third distributed fault location equation, and finishing until the obtained results are all in the first assumed interval of the fault, i.e. the obtained results can be used to identify the actual location of the fault. As can be understood, the second reference coordinate system is not a single fault interval, but a remaining reference coordinate system different from the first reference coordinate system.

[0054] In addition, in the actual calculation process, even if the reference coordinate system or the assumed fault section is changed alone, there may still be a phenomenon that all the obtained results cannot be made to be in the assumed fault section. In this case, it is necessary to change the reference coordinate system and the assumed fault section simultaneously, traverse all combinations of the reference coordinate system and the assumed fault section, and construct a distributed fault location equation. Only when all the obtained results are in the assumed fault section, the selected reference coordinate system and assumed fault section are accurate, and the distributed fault location equation at this time can be used to calculate the actual location of the fault.

[0055] In some examples, the step of constructing a plurality of simultaneous equations for distributed fault location based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information, and the propagation speed of the traveling wave in each of the reference coordinate systems includes: constructing a generalized simultaneous equation system for fault location; A step of constructing a plurality of distributed fault location identification simultaneous equations based on the general-purpose simultaneous equations for fault location identification, the monitoring point coordinate information in each of the reference coordinate systems, the wave crest arrival time information, the fault assumption section, and the propagation speed of the traveling wave, the general-purpose simultaneous equations for fault location identification being as follows:

number

[0056] For example, this embodiment provides a general-purpose simultaneous equation system for fault location as shown in Equation (E):

number

[0057] According to the above-mentioned general-purpose simultaneous equations for fault location identification, the monitoring point coordinate information and the above-mentioned wave crest arrival time information are substituted into the general-purpose simultaneous equations for fault location identification in different reference systems, and the simultaneous equations for distributed fault location identification are established by removing the absolute value symbols based on the positions of different assumed fault sections, and the actual position of the fault is identified by solving multiple simultaneous equations for distributed fault location identification.

[0058] In some examples, the step of constructing a plurality of simultaneous equations for distributed fault location based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information, and the propagation speed of the traveling wave in each of the reference coordinate systems includes: constructing a default simultaneous equation for fault location when the wave crest arrival time is missing at some monitoring sites; A step of constructing a plurality of distributed fault location simultaneous equations based on the default simultaneous equations for fault location identification, the monitoring point coordinate information in each of the acquired reference coordinate systems, the wave crest arrival time information, the fault assumption section, and the propagation speed of the traveling wave, wherein the default simultaneous equations for fault location identification are as follows:

number

[0059] For example, in actual engineering applications, there may be cases where the wave crest arrival time is not obtained at some monitoring sites due to abnormal operation of some traveling wave crest monitoring devices. For this phenomenon, the present embodiment provides a default simultaneous equation for fault location identification as shown in formula (F):

number

[0060] According to the default equation of fault location, even if some monitoring sites do not obtain the crest time of the traveling wave, the monitoring point coordinate information in the corresponding different reference system can still be substituted into the default equation of fault location based on the remaining crest time information, and the simultaneous equations of distributed fault location can be established by removing the absolute value sign according to the positions of different assumed fault sections, and the actual location of the fault can be determined by solving the simultaneous equations of multiple distributed fault location. Note that the method of determining the actual location of the fault is still realized by constantly changing the reference coordinate system and the assumed fault section, and comparing the obtained result with the assumed location section, and the description is omitted here.

[0061] In one possible embodiment, as shown in FIG. 8, a reference coordinate system is constructed by expanding the line of L7 segment, the fault point location coordinate is set as x, and the fault occurrence time is set as t. In actual use, the traveling wave arrival time t3 is missing, and based on the received wave crest arrival time, the default simultaneous equations for fault location are as follows:

number

number

[0062] In some examples, the monitoring points are provided at one or more of the following locations: a connection between a busbar and a line, a connection between a cable of a different line type and an overhead line, a connection between two lines of different wire diameters, and a section where the line length is longer than a preset length and needs to be accurately located; a traveling wave crest monitoring sensor is provided at the monitoring site, and the traveling wave crest monitoring sensor is used to determine the crest arrival time at the corresponding monitoring point, and the traveling wave crest monitoring sensor includes a current type and a voltage type.

[0063] For example, the monitoring points may be installed at one or more of the following locations: a connection between a busbar and a line, a connection between a cable of a different line type and an overhead line, a connection between two lines of different diameters, and a section where the line length is greater than a preset length and needs to be accurately located; the preset length may be determined based on the specific accuracy requirements of detection. A traveling wave crest monitoring sensor is installed at the monitoring site, and the traveling wave crest monitoring sensor is used to determine the crest arrival time at the corresponding monitoring point, and the traveling wave crest monitoring sensor can determine the crest arrival time by acquiring the traveling wave on the line; the operation of acquiring the crest arrival time may be completed by the traveling wave crest monitoring sensor, and the crest arrival time may be transmitted to the location host, or the location host may acquire the traveling wave acquired by the traveling wave crest monitoring sensor and process the data by the location host. The traveling wave crest monitoring sensor includes a current type and a voltage type.

[0064] In some examples, the step of identifying an actual location of a fault based on a result of solving each of the distributed fault location simultaneous equations and the fault assumption interval comprises: When the results of solving one of the simultaneous equations for distributed fault location identification are all within the fault section, a step of identifying the actual location of the fault using a mathematical statistical method based on the results of the solution, wherein the data statistical method includes at least one of the average method, the least squares method, the variance method, and the mathematical expectation method.

[0065] For example, any binomial equation described in the above embodiment can obtain one calculation result, and theoretically each calculation result should be the same, but due to the influence of environmental factors, the propagation of the traveling wave in each segment of the line may be influenced by the environment, which may affect the calculation result, and this embodiment obtains the calculation result by any two fault location equations, integrates and statistics the multiple results, analyzes the reasonable result, and processes it to eliminate the influence of factors such as the environment on the measurement result, so as to obtain a more accurate fault location. The results obtained by any two fault location equations are subjected to data statistics including one or more of the average method, the least square method, the variance method, and the mathematical expectation method to obtain a more accurate fault location, thereby determining a result with higher relevance and smaller error in the data, thereby eliminating the error in the measurement and making the fault location more accurate.

[0066] For example, the line fault coordinates can be calculated using the average method,

number

[0067] In some examples, a traveling wave fault location can be determined by a traveling wave fault location computation system, the traveling wave fault location computation system comprising: The loop-type power network includes a traveling wave localization sensor and a localization host arranged in a power transmission / distribution line, and the localization host includes a communication module, a data processing module, a localization calculation module, and an output display module. The traveling wave localization sensor arranged in the power transmission / distribution line is used to monitor the traveling wave of the voltage or current of the power line, the communication module of the localization host is used to communicate with the traveling wave localization sensor and obtain the initial time or traveling wave waveform of the traveling wave arriving at each distributed traveling wave sensor, the data processing module is used to process data such as the initial time and traveling wave waveform of the traveling wave, the localization calculation module is used to solve the distributed fault localization calculation equation and obtain an optimal solution, and the output display module is used to display the points where the distributed sensors are arranged in the power transmission / distribution line, the fault points, coordinates, and fault distance information.

[0068] As shown in FIG. 10, one embodiment of a loop-type power network fault locating device in an embodiment of the present invention includes: A first construction unit 91 for constructing a plurality of reference coordinate systems by expanding each loop-type line segment in a loop-type power network with an arbitrary point as a coordinate origin, the first construction unit 91 being a line segment between two adjacent monitoring sites; A first acquisition unit 92 for acquiring monitoring point coordinate information and wave crest arrival time of each of the monitoring sites in each of the reference coordinate systems; A second acquisition unit 93 for acquiring assumed fault point information, the assumed fault point information including fault point assumed coordinates, assumed fault occurrence time and assumed fault section; a third acquisition unit 94 for acquiring the propagation velocity of the traveling wave; A second construction unit 95 for constructing multiple distributed fault location simultaneous equations based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information and the propagation speed of the traveling wave in each of the reference coordinate systems; and a location unit 96 for determining an actual location of the fault based on the results of solving the simultaneous equations of each of the distributed fault location determinations and the fault assumption interval.

[0069] As shown in FIG. 11 , an embodiment of the present invention further provides an electronic device 300 including a memory 310, a processor 320, and a computer program 311 stored in the memory 320 and executable by the processor, the processor 320, when executing the computer program 311, implementing steps of any of the methods for fault location in a loop power network described above.

[0070] The electronic device introduced in this embodiment is an equipment adopted to implement the fault location identification device for a loop-type power network in the embodiment of the present invention. Therefore, based on the method introduced in the embodiment of the present invention, those skilled in the art can understand the specific embodiment of the electronic device in this embodiment and its various modified forms. Therefore, here, we will not introduce in detail how the electronic device realizes the method in the embodiment of the present invention. As long as it is an equipment used by those skilled in the art to implement the method in the embodiment of the present invention, it all falls within the scope of protection of the present invention.

[0071] In a specific implementation, the computer program 311 can realize any one of the embodiments in the corresponding embodiment of FIG. 1 when executed by a processor.

[0072] In the above embodiments, the description of each embodiment is given with emphasis on its own, and for parts that are not described in detail in one embodiment, reference can be made to the descriptions of other embodiments.

[0073] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, a system, or a computer program product. As such, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied in one or more computer usable storage mediums (including, but not limited to, magnetic disk memories, CD-ROMs, optical memories, etc.) having computer usable program code embodied therein.

[0074] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to the embodiments. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams, are realized by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, a special purpose computer, an embedded computer, or other programmable data processing device to generate a machine, the instructions being executed by the processor of the computer or other programmable data processing device to generate an apparatus for implementing the functions specified in one or more flows of the flowcharts and / or one or more blocks of the block diagrams.

[0075] These computer program instructions may be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, causing the instructions stored in the computer-readable memory to generate an article of manufacture including an instruction apparatus that implements the functions specified in one or more flows of the flowcharts and / or one or more blocks of the block diagrams.

[0076] These computer program instructions may be uploaded into a computer or other programmable data processing device which performs a series of operational steps to generate a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more flows of the flowcharts and / or one or more blocks of the block diagrams.

[0077] An embodiment of the present invention further provides a computer program product including computer software instructions that, when executed on a processing device, cause the processing device to execute a flow of a fault location method for a loop-type power network in an embodiment corresponding to FIG. 1.

[0078] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed by a computer, the flow or function according to the embodiment of the present invention is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another, for example, the computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wire (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, radio, microwave, etc.) methods. The computer-readable storage medium can be any available medium that can be stored in a computer, or a data storage device including a server, data center, etc. that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid state disks (SSDs)).

[0079] Those skilled in the art will clearly understand that for convenience and conciseness of description, the specific operating processes of the above-mentioned systems, devices and units can refer to the corresponding processes in the above-mentioned method embodiments, and the description will be omitted here.

[0080] In some embodiments provided in the present invention, it should be understood that the disclosed system, device, and method may be realized in other forms. For example, the above-mentioned device embodiments are merely exemplary, and the division of units is merely a division of logical functions, and in actual implementation, other division methods may be used, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not implemented. In other aspects, the shown or discussed mutual couplings or direct couplings or communication connections may be indirect couplings or communication connections via some interfaces, devices or units, which may be electrical, mechanical, or other forms.

[0081] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed among multiple network units. According to actual needs, some or all of the units can be selected to achieve the objective of the solution of the present embodiment.

[0082] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit. The integrated unit may be realized in the form of hardware or in the form of a software functional unit.

[0083] When the integrated unit is realized in the form of a software functional unit and sold or used as an independent product, it can be stored in one computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially or a part that contributes to the prior art, or all or a part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium and includes some instructions for making a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or a part of the steps of the method of each embodiment of the present invention. In addition, the above-mentioned storage medium includes various media that can store program codes, such as a U disk, a portable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, and an optical disk.

[0084] What has been disclosed above is merely a preferred embodiment of the present invention, and it is obvious that the scope of the present invention cannot be limited thereby. Therefore, equivalent changes made based on the claims of the present invention still belong to the scope covered by the present invention.

[0085] (Additional Note) (Appendix 1) A step of constructing a plurality of reference coordinate systems by expanding each loop-type line segment in a loop-type power network with an arbitrary point as a coordinate origin, the loop-type line segment being a line segment between two adjacent monitoring sites; acquiring monitoring point coordinate information and wave crest arrival time of each of the monitoring sites in each of the reference coordinate systems; A step of acquiring assumed fault point information, the assumed fault point information including assumed fault point coordinates, assumed fault occurrence time, and assumed fault section; Obtaining a propagation velocity of a traveling wave; A step of constructing a plurality of simultaneous equations for distributed fault location identification based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information, and the propagation speed of the traveling wave in each of the reference coordinate systems; and determining an actual location of a fault based on a result of solving the simultaneous equations of each of the distributed fault localization methods and the fault assumption interval. A method for identifying a fault location in a loop-type power network, comprising:

[0086] (Appendix 2) The assumed fault section includes a first assumed fault section, the reference coordinate system includes a first reference coordinate system, the plurality of distributed fault location simultaneous equations include a first distributed fault location simultaneous equation, and the first distributed fault location simultaneous equations are determined based on the first assumed fault section, the propagation speed of the traveling wave, the coordinate information of the monitoring site in the first reference coordinate system, and the wave crest arrival time information; The step of identifying an actual location of a fault based on a result of solving the simultaneous equations of each of the distributed fault localizations and the fault assumption interval includes: solving a first distributed fault location system of equations to determine a first hypothetical location of the fault; if the first assumed location of the fault is located in the first assumed interval of the fault, determining the first assumed location of the fault as the actual location of the fault; A method for identifying a fault location in a loop-type power network as described in Supplementary Note 1.

[0087] (Appendix 3) The assumed fault section further includes a second assumed fault section, the reference coordinate system further includes a second reference coordinate system, the plurality of distributed fault location simultaneous equations further include a second distributed fault location simultaneous equation and a third distributed fault location simultaneous equation, the second distributed fault location simultaneous equation is determined based on the second assumed fault section, the propagation speed of the traveling wave, the coordinate information of the monitoring site in the first reference coordinate system and the wave front arrival time information, and the third distributed fault location simultaneous equation is determined based on the first assumed fault section, the propagation speed of the traveling wave, the coordinate information of the monitoring site in the second reference coordinate system and the wave front arrival time information, The method further comprises: if the first assumed location of the fault is outside the first assumed interval of the fault, solving a second distributed fault location system to determine a second assumed location of the fault; if the second assumed location of the fault is located in the second assumed fault section, determining the second assumed location of the fault as the actual location of the fault; Or, if the first assumed location of the fault is outside the first assumed interval of the fault, solving a third distributed fault location system to determine a third assumed location of the fault; if the third assumed location of the fault is located in the first assumed section of the fault, determining the third assumed location of the fault as the actual location of the fault; A method for identifying a fault location in a loop-type power network as described in Supplementary Note 2.

[0088] (Appendix 4) The step of constructing a plurality of simultaneous equations for distributed fault location identification based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information, and the propagation speed of the traveling wave in each of the reference coordinate systems, constructing a generalized simultaneous equation system for fault location; A step of constructing a plurality of distributed fault location identification simultaneous equations based on the general-purpose simultaneous equations for fault location identification, the monitoring point coordinate information in each of the reference coordinate systems, the wave crest arrival time information, the fault assumption section, and the propagation speed of the traveling wave, wherein the general-purpose simultaneous equations for fault location identification are as follows:

number

[0089] (Appendix 5) The step of constructing a plurality of simultaneous equations for distributed fault location identification based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information, and the propagation speed of the traveling wave in each of the reference coordinate systems, constructing a default simultaneous equation for fault location when the wave front arrival time is missing at some monitoring sites; A step of constructing multiple distributed fault location simultaneous equations based on the default simultaneous equations for fault location identification, the monitoring point coordinate information in each of the acquired reference coordinate systems, the wave crest arrival time information, the fault assumption section, and the propagation speed of the traveling wave, wherein the default simultaneous equations for default fault location identification are as follows:

number

[0090] (Appendix 6) The monitoring site is provided at one or more of the following locations: a connection between a busbar and a line, a connection between a cable of a different line type and an overhead line, a connection between two lines of different wire diameters, and a section where the line length is longer than a preset length and needs to be accurately located; a traveling wave crest monitoring sensor is provided at the monitoring site, and the traveling wave crest monitoring sensor is used to determine the crest arrival time of the corresponding monitoring point, and the traveling wave crest monitoring sensor includes a current type and a voltage type. A method for identifying a fault location in a loop-type power network as described in Supplementary Note 1.

[0091] (Appendix 7) The step of identifying an actual location of a fault based on a result of solving the simultaneous equations of each of the distributed fault localizations and the fault assumption interval includes: When the results of solving one of the simultaneous equations of distributed fault location identification are all within the fault section, the actual location of the fault is identified based on the results of solving the simultaneous equations by using a mathematical statistical method, the data statistical method including at least one of the following: an average method, a least square method, a variance method, and a mathematical expectation method; A method for identifying a fault location in a loop-type power network as described in Supplementary Note 1.

[0092] (Appendix 8) A first construction unit for constructing a plurality of reference coordinate systems by expanding each loop-type line segment in a loop-type power network with an arbitrary point as a coordinate origin, the first construction unit being a line segment between two adjacent monitoring sites; A first acquisition unit for acquiring monitoring point coordinate information and wave crest arrival time of each of the monitoring sites in each of the reference coordinate systems; A second acquisition unit for acquiring assumed fault point information, the assumed fault point information including an assumed fault point coordinate, an assumed fault occurrence time and an assumed fault section; a third acquisition unit for acquiring the propagation velocity of the traveling wave; A second construction unit for constructing a plurality of simultaneous equations of distributed fault location identification based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information and the propagation speed of the traveling wave in each of the reference coordinate systems; and a location unit for determining an actual location of a fault based on a result of solving the simultaneous equations of each of the distributed fault location determinations and the fault assumption interval. A fault location identification device for a loop-type power network, comprising:

[0093] (Appendix 9) A memory, a processor, and a computer program stored in the memory and executable by the processor, the processor being used to realize the steps of the method for identifying a fault location in a loop power network according to any one of appendices 1 to 7 when executing the computer program stored in the memory; 1. An electronic device comprising:

[0094] (Appendix 10) A computer-readable storage medium having a computer program stored therein, the computer program being executed by a processor to realize a fault location method for a loop power network according to any one of appendices 1 to 7; A computer-readable storage medium comprising:

Claims

1. A step of constructing a plurality of reference coordinate systems by expanding each loop-type line segment in a loop-type power network with an arbitrary point as a coordinate origin, the loop-type line segment being a line segment between two adjacent monitoring sites; acquiring monitoring point coordinate information and wave crest arrival time information of each of the monitoring sites in each of the reference coordinate systems; A step of acquiring assumed fault point information, the assumed fault point information including assumed fault point coordinates, assumed fault occurrence time, and assumed fault section; Obtaining a propagation velocity of a traveling wave; A step of constructing a plurality of simultaneous equations for distributed fault location identification based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information, and the propagation speed of the traveling wave in each of the reference coordinate systems; and determining an actual location of a fault based on a result of solving the simultaneous equations of each of the distributed fault localization methods and the fault assumption interval. A method for identifying a fault location in a loop-type power network, comprising:

2. The assumed fault section includes a first assumed fault section, the reference coordinate system includes a first reference coordinate system, the plurality of distributed fault location simultaneous equations include a first distributed fault location simultaneous equation, and the first distributed fault location simultaneous equations are determined based on the first assumed fault section, the propagation speed of the traveling wave, the monitoring point coordinate information of the monitoring site in the first reference coordinate system, and the wave crest arrival time information; The step of identifying an actual location of a fault based on a result of solving the simultaneous equations of each of the distributed fault localizations and the fault assumption interval includes: solving a first distributed fault location system of equations to determine a first hypothetical location of the fault; if the first assumed location of the fault is located in the first assumed interval of the fault, determining the first assumed location of the fault as the actual location of the fault; The method for locating a fault in a loop-type power network according to claim 1 .

3. The assumed fault section further includes a second assumed fault section, the reference coordinate system further includes a second reference coordinate system, the plurality of distributed fault location simultaneous equations further include a second distributed fault location simultaneous equation and a third distributed fault location simultaneous equation, the second distributed fault location simultaneous equation is determined based on the second assumed fault section, the propagation speed of the traveling wave, the monitoring point coordinate information of the monitoring site in the first reference coordinate system and the wave crest arrival time information, and the third distributed fault location simultaneous equation is determined based on the first assumed fault section, the propagation speed of the traveling wave, the monitoring point coordinate information of the monitoring site in the second reference coordinate system and the wave crest arrival time information, The method further comprises: if the first assumed location of the fault is outside the first assumed interval of the fault, solving a second distributed fault location system to determine a second assumed location of the fault; if the second assumed location of the fault is located in a second assumed interval of the fault, determining the second assumed location of the fault as the actual location of the fault; Or, if the first assumed location of the fault is outside the first assumed interval of the fault, solving a third distributed fault location system to determine a third assumed location of the fault; determining, if the third assumed location of the fault is located in the first assumed section of the fault, that the third assumed location of the fault is the actual location of the fault; The method for locating a fault in a loop-type power network according to claim 2.

4. The step of constructing a plurality of simultaneous equations for distributed fault location identification based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information, and the propagation speed of the traveling wave in each of the reference coordinate systems, constructing a generalized simultaneous equation system for fault localization; A step of constructing a plurality of distributed fault location identification simultaneous equations based on the general-purpose simultaneous equations for fault location identification, the monitoring point coordinate information in each of the reference coordinate systems, the wave crest arrival time information, the fault assumption section, and the propagation speed of the traveling wave, wherein the general-purpose simultaneous equations for fault location identification are as follows: [0010] Here, x is the assumed fault point coordinate, t is the assumed fault occurrence time, and x ０ , x １ ……x ｉ is the monitoring point coordinate information, and t ０ , t １ ……t ｉ is the wave crest arrival time information, and v is the propagation speed of the traveling wave. The method for locating a fault in a loop-type power network according to claim 1 .

5. The step of constructing a plurality of simultaneous equations for distributed fault location identification based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information, and the propagation speed of the traveling wave in each of the reference coordinate systems, constructing a default simultaneous equation for fault location when the wave front arrival time information is missing at some monitoring sites; A step of constructing a plurality of distributed fault location identification simultaneous equations based on the default simultaneous equations for fault location identification, the monitoring point coordinate information in each of the acquired reference coordinate systems, the wave crest arrival time information, the fault assumption section, and the propagation speed of the traveling wave, the default simultaneous equations for fault location identification being as follows: [0025] Here, x is the assumed fault point coordinate, t is the assumed fault occurrence time, and x ０ , x １ ……x ｉ－ｎ is the monitoring point coordinate information, and t ０ , t １ ……t ｉ－ｎ is the wave crest arrival time information, n is the number of monitoring sites that do not acquire wave crest arrival time information, and v is the propagation speed of the traveling wave. The method for locating a fault in a loop-type power network according to claim 1 .

6. A first construction unit for constructing a plurality of reference coordinate systems by expanding each loop-type line segment in a loop-type power network with an arbitrary point as a coordinate origin, the first construction unit being a line segment between two adjacent monitoring sites; A first acquisition unit for acquiring monitoring point coordinate information and wave crest arrival time information of each of the monitoring sites in each of the reference coordinate systems; A second acquisition unit for acquiring assumed fault point information, the assumed fault point information including an assumed fault point coordinate, an assumed fault occurrence time and an assumed fault section; a third acquisition unit for acquiring the propagation velocity of the traveling wave; A second construction unit for constructing a plurality of simultaneous equations of distributed fault location identification based on the monitoring point coordinate information, the wave front arrival time information, the assumed fault point information and the propagation speed of the traveling wave in each of the reference coordinate systems; and a location unit for determining an actual location of a fault based on a result of solving the simultaneous equations of each of the distributed fault location determinations and the fault assumption interval. A fault location identification device for a loop-type power network, comprising:

7. A method for locating a fault in a loop-type power network comprising: a memory; a processor; and a computer program stored in the memory and executable by the processor, the processor being used to realize the steps of the method for locating a fault in a loop-type power network according to any one of claims 1 to 5 when executing the computer program stored in the memory.

1. An electronic device comprising:

8. A method for identifying a fault location in a loop-type power network according to any one of claims 1 to 5, A program characterized by:

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