Line selection method for judging fault point based on line disconnection increment method

Abstract

The invention, which relates to the technical field of fault point line selection, discloses a line selection method for determining a fault point based on a line pull increment method, comprising the following steps: installing a monitoring sensor on a line node, monitoring the current and voltage of the line node, and obtaining a topological graph of an electric power line at the same time; analyzing a reference current and a reference voltage of a line node during normal operation; when the circuit system breaks down, current increments and voltage increments of different line nodes are calculated; based on the topological graph, the current increment and the voltage increment, line selection is carried out on the fault point through a line pulling increment method; the fault point line selection method is used for solving the problem that the accuracy of fault line selection is low due to the fact that small characteristic quantity is used as a judgment basis and the influence of environment temperature is not eliminated in an existing fault point line selection technology.

Description

Technical Field

[0001] The present invention relates to the technical field of fault point line selection, and in particular to a line selection method for judging a fault point based on a line pulling increment method. Background Art

[0002] Fault point selection technology refers to a technology used to locate faults in power systems. It determines the location of faults in the system by analyzing parameter data such as voltage and current in the power system and combining specific algorithms and methods. Various types of faults may occur during the operation of the power system, such as short circuits and ground faults. These faults will affect the normal operation of the system, so it is necessary to locate and handle these faults in a timely and accurate manner.

[0003] Existing fault point line selection technology usually uses traditional sequential switching methods and visual line inspection methods to find fault lines and fault points, but various protection devices for finding single-phase grounding faults mainly use smaller characteristic quantities as criteria, so the accuracy is low. It is a typical line selection and positioning principle based on the steady-state quantity of single-phase grounding faults, and uses the amplitude and phase relationship of zero-sequence current and zero-sequence voltage to form a criterion. The criterion characteristic quantity is small and the accuracy is low. The ambient temperature will also cause the current and voltage on the line and the indication of the sensor to change, which will also reduce the accuracy of line selection. For example, in a patent application with publication number CN115128393A, a small current grounding fault line selection identification method that integrates fault line selection results is disclosed. This solution uses smaller characteristic quantities such as zero-sequence current as the basis for judgment, and the accuracy is low. The existing fault point line selection technology also has the problem of using smaller characteristic quantities as the basis for judgment and not eliminating the influence of ambient temperature, resulting in low accuracy of fault line selection. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the prior art to a certain extent, by installing monitoring sensors on line nodes to monitor the current and voltage of the line nodes, obtaining a topological map of the power lines at the same time, and then analyzing the current reference value and the voltage reference value of the line nodes during normal operation, and then obtaining the reference current and the reference voltage of the line nodes based on the current reference value and the voltage reference value. When a circuit system fails, the current increment and the voltage increment of different line nodes are calculated, and a safe range of the current increment is obtained based on the normal current increment analysis, marked as the current safety range, and then a safe range of the voltage increment is obtained based on the normal voltage increment analysis, marked as the voltage safety range. Finally, based on the current safety range and the voltage safety range, combined with the topological map, analysis is performed to select the line for the fault point, so as to solve the problem that the existing fault point line selection technology still uses a small feature quantity as the judgment basis and does not exclude the influence of the ambient temperature, resulting in a low accuracy rate of fault line selection.

[0005] To achieve the above objectives, in a first aspect, the present application provides a line selection method for determining a fault point based on a line-pulling increment method, comprising the following steps:

[0006] Install monitoring sensors on line nodes to monitor the current and voltage of line nodes and obtain the topology of power lines;

[0007] Analyze the reference current and reference voltage of the line nodes during normal operation;

[0008] When a circuit system fails, the current increment and voltage increment of different line nodes are calculated;

[0009] Based on the topology diagram, current increment and voltage increment, the fault point is selected by the line-pulling increment method.

[0010] Furthermore, installing monitoring sensors on the line nodes to monitor the current and voltage of the line nodes and obtaining the topology of the power lines includes the following sub-steps:

[0011] Installing monitoring sensors on line nodes, wherein the monitoring sensors include an ammeter and a voltmeter;

[0012] The current and voltage of the line nodes are monitored, and the monitored current and voltage are named monitoring current and monitoring voltage respectively;

[0013] Get the topology of the power line, and number the line nodes in the topology in the order of the distance from the line node to the power generation equipment from small to large. n Represents, where n is a positive integer and n is the sequence number of L.

[0014] Furthermore, analyzing the reference current and reference voltage of the line node during normal operation includes the following sub-steps:

[0015] Analyze the current reference value and voltage reference value of the line nodes during normal operation;

[0016] The reference current and the reference voltage of the line node are obtained based on the current reference value and the voltage reference value.

[0017] Furthermore, analyzing the current reference value and the voltage reference value of the line node during normal operation includes the following sub-steps:

[0018] Obtaining a temperature coefficient of a monitoring sensor, wherein the temperature coefficient includes a current coefficient and a voltage coefficient;

[0019] Monitoring L n Real-time current and real-time voltage, and real-time temperature;

[0020] By formula Vn (0) = V n / (SV×T) to calculate the voltage reference value, where V n (0) is L n The voltage reference value, V n For L n The real-time voltage, SV is the voltage coefficient, and T is the real-time temperature;

[0021] By formula I n (0) = I n / (SA×T) to calculate the current reference value, where I n (0) is L n The current reference value, I n For L n The real-time voltage, SA is the current coefficient.

[0022] Further, obtaining a reference current and a reference voltage of a line node based on the current reference value and the voltage reference value analysis includes the following sub-steps:

[0023] L n n is the X-axis, and the current reference value is the Y-axis to establish a plane rectangular coordinate system, named the current reference distribution diagram, and L n And the corresponding current reference value is entered into the current reference distribution diagram;

[0024] L n n is the X-axis, and the voltage reference value is the Y-axis to establish a plane rectangular coordinate system, named voltage reference distribution diagram, and L n and the corresponding voltage reference value is entered into the voltage reference distribution diagram;

[0025] Performing polynomial regression on the current reference distribution diagram and the voltage reference distribution diagram respectively to obtain a current reference function and a voltage reference function;

[0026] Substitute n into the current reference function and the voltage reference function respectively to calculate L n The reference current and reference voltage are represented by the symbols IN n and VN n express.

[0027] Furthermore, when a fault occurs in the circuit system, calculating the current increment and voltage increment of different line nodes includes the following sub-steps:

[0028] When a circuit system fails, obtain real-time current and real-time voltage;

[0029] The real-time current is calculated by the current reference value calculation formula to obtain the real-time current reference value; the real-time voltage is calculated by the voltage reference value calculation formula to obtain the real-time voltage reference value.n and VF n express;

[0030] Calculate ΔI n =IF n -IN n , where ΔI n For L n The current increment;

[0031] Calculate ΔV n =VF n -VN n , where ΔV n For L n The voltage increment.

[0032] Furthermore, based on the topology diagram, the current increment and the voltage increment, selecting the fault point by the line-pulling increment method includes the following sub-steps:

[0033] Based on the normal current increment analysis, the safety range of the current increment is obtained and marked as the current safety range;

[0034] Based on the normal voltage increment analysis, the safety range of voltage increment is obtained and marked as voltage safety range;

[0035] Based on the current safety range and voltage safety range, combined with the topology diagram, analysis is performed to select the line for the fault point.

[0036] Further, obtaining a safe range of current increment based on the normal current increment analysis, marked as the current safety range, includes the following sub-steps:

[0037] L n The n in the figure is the horizontal axis, and the current increment is the vertical axis to establish a plane rectangular coordinate system, which is named as the current range scatter plot;

[0038] Record the history in n The corresponding normal current increment is recorded in the current range scatter diagram, and the coordinate points in the current range scatter diagram are named as current increment points;

[0039] Performing polynomial regression on the current range scatter plot to obtain a current safety function, plotting the current safety function in the current range scatter plot, and naming a curve corresponding to the current safety function as a current safety curve;

[0040] Move the current safety curve vertically toward the positive direction of the Y axis, monitor the distribution of the current increment points, and stop moving when there is no current increment point above the current safety curve. Name the current safety curve at this time as the current safety range curve, and name the function corresponding to the current safety range curve as the current safety range function;

[0041] Substitute n into the current safety range function and mark the calculated result as R n , the range [0, R n ] Marked as L n Current safety range.

[0042] Further, obtaining a safe range of voltage increment based on the normal voltage increment analysis, marked as voltage safety range, includes the following sub-steps:

[0043] L n The n in the figure is the horizontal axis, and the voltage increment is the vertical axis to establish a plane rectangular coordinate system, which is named voltage range scatter plot;

[0044] Record the history in n The corresponding normal voltage increment is entered into the voltage range scatter plot, and the coordinate points in the voltage range scatter plot are named voltage increment points;

[0045] Perform polynomial regression on the voltage range scatter plot to obtain a voltage safety function, plot the voltage safety function on the voltage range scatter plot, and name the curve corresponding to the voltage safety function a voltage safety curve;

[0046] Move the voltage safety curve vertically in the positive direction of the Y axis, monitor the distribution of voltage increment points, and stop moving when there is no voltage increment point above the voltage safety curve. Name the voltage safety curve at this time as a voltage safety range curve, and name the function corresponding to the voltage safety range curve as a voltage safety range function;

[0047] Substitute n into the voltage safety range function and mark the calculated result as E n , the range [0, E n ] Marked as L n Voltage safety range.

[0048] Furthermore, based on the current safety range and the voltage safety range, combined with the topology diagram, the line selection for the fault point includes the following sub-steps:

[0049] For line node L n , the ΔI calculated in real time n With R n For comparison, if ΔI n Less than or equal to R n , then the output current increment is normal signal; if ΔI n Greater than R n , then the output current increment abnormal signal;

[0050] For line node L n , the ΔV calculated in real time n With E n For comparison, if ΔVn Less than or equal to E n , then the output voltage increment is a normal signal; if ΔV n Greater than E n , then the output voltage increment abnormal signal;

[0051] The line nodes that output abnormal current increment signals or abnormal voltage increment signals are marked as abnormal nodes, and the abnormal nodes are numbered and marked with symbols P m Represents, where m is a positive integer and m is the serial number of P;

[0052] For any P m , will be in the topology diagram with P m The adjacent line nodes connected by the line are named as adjacent nodes, and whether there are abnormal nodes in the adjacent nodes is detected. If there are no abnormal nodes in the adjacent nodes, a fault line signal is output; if there are abnormal nodes in the adjacent nodes, a deep line selection signal is output;

[0053] If a deep line selection signal is output, adjacent abnormal nodes connected by lines in the topology diagram are marked as connecting nodes, and the maximum value of the current increment and the maximum value of the voltage increment in the connecting node are obtained and marked as the maximum current increment and the maximum voltage increment respectively;

[0054] The abnormal nodes corresponding to the maximum current increment and the maximum voltage increment are marked as fault nodes. If the fault nodes are the same abnormal node, a single node signal is output; if the fault nodes are different abnormal nodes, a double node signal is output;

[0055] If a single-node signal is output, the abnormal node with the second largest current increment and voltage increment among the connected nodes is obtained, and the faulty node and the connection between them are marked as the faulty line;

[0056] If a dual-node signal is output, the connection between the two faulty nodes is marked as a faulty line.

[0057] Beneficial effects of the present invention: The present invention installs monitoring sensors on line nodes to monitor the current and voltage of line nodes, obtains the topology of the power line at the same time, analyzes the current reference value and voltage reference value of the line node during normal operation, and then obtains the reference current and reference voltage of the line node based on the current reference value and the voltage reference value. The advantage is that the present invention adopts an incremental method for judgment, and since the ambient temperature will affect the current and voltage of the line and the indication of the sensor, and historical data cannot unify the ambient temperature, the reference current and reference voltage corresponding to each line node are analyzed to remove the influence of the ambient temperature, provide a reliable data basis for subsequent analysis, and improve the accuracy and effectiveness of fault line selection;

[0058] The present invention calculates the current increment and voltage increment of different line nodes when a circuit system fails, obtains a safe range of current increment based on normal current increment analysis, and marks it as a current safety range, then obtains a safe range of voltage increment based on normal voltage increment analysis, and marks it as a voltage safety range, and finally selects the line for the fault point based on the current safety range and the voltage safety range in combination with a topological diagram for analysis. The advantage of the present invention is that the safe ranges of current increment and voltage increment are different for each line node, and the failure of one line may cause abnormal changes in increments of multiple adjacent lines. At this time, it is necessary to make a more accurate judgment on them, rather than judging all line nodes that exceed the safety range as faulty lines, thereby improving the accuracy and rationality of fault line selection. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 is a flow chart of the steps of the method of the present invention;

[0060] Figure 2 is a schematic diagram of a topological diagram of the present invention;

[0061] Figure 3 is a schematic diagram of a current reference distribution diagram of the present invention;

[0062] Figure 4 is a schematic diagram of a current range scatter diagram of the present invention;

[0063] Figure 5 is a schematic diagram of a current safety range curve of the present invention;

[0064] Figure 6 is a schematic diagram of an abnormal node of the present invention;

[0065] Figure 7 It is a schematic structural diagram of the electronic device of the present invention. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0067] Example 1, please refer to Figure 1 As shown, the present application provides a line selection method for determining a fault point based on a pull-line increment method, comprising the following steps:

[0068] Step S1, installing monitoring sensors on line nodes to monitor the current and voltage of the line nodes and simultaneously obtaining a topological map of the power line; Step S1 includes the following sub-steps:

[0069] Step S101, installing monitoring sensors on line nodes, the monitoring sensors including ammeters and voltmeters;

[0070] Step S102, monitoring the current and voltage of the line node, and naming the monitored current and voltage as monitoring current and monitoring voltage respectively;

[0071] See also Figure 2 As shown, in step S103, a topological diagram of the power line is obtained, and the line nodes in the topological diagram are numbered in the order of the distance from the line node to the power generation equipment from small to large, and the symbol L is used to identify the line nodes. n represents, where n is a positive integer and n is the sequence number of L;

[0072] In the specific implementation, the ammeter and voltmeter are both existing current and voltage meters. The monitored current is 3000.42A and the monitored voltage is 500.067kV. The topology diagram is as follows: Figure 2 As shown, the line node number L n Also there Figure 2 Marked in.

[0073] Step S2, analyzing the reference current and reference voltage of the line node during normal operation; Step S2 includes the following sub-steps:

[0074] Step S201, analyzing the current reference value and voltage reference value of the line node during normal operation;

[0075] Step S201 includes the following sub-steps:

[0076] Step S2011, obtaining the temperature coefficient of the monitoring sensor, the temperature coefficient includes a current coefficient and a voltage coefficient;

[0077] Step S2012, monitor L n Real-time current and real-time voltage, and real-time temperature;

[0078] Step S2013, by formula V n (0) = V n / (SV×T) to calculate the voltage reference value, where V n (0) is L n The voltage reference value, V n For L n The real-time voltage, SV is the voltage coefficient, and T is the real-time temperature;

[0079] Step S2014, by formula I n (0) = I n / (SA×T) to calculate the current reference value, where I n (0) is L n The current reference value, I n For L n The real-time voltage, SA is the current coefficient;

[0080] In the specific implementation, the temperature coefficient is the original factory parameter of the ammeter and the voltmeter, which is an inherent value. The voltage coefficient is 2V / ℃, which is converted to kV as 0.002kV / ℃, and the current coefficient is 1.5mA / ℃, which is converted to A as 0.015A / ℃. For the line node L1, at this time n=1, the real-time current is 3000.42A, the real-time voltage is 500.067kV, and the real-time temperature is 34℃. The voltage reference value V1(0)=499.999kV and the current reference value I1(0)=2999.91A are obtained by calculation.

[0081] Step S202, analyzing and obtaining a reference current and a reference voltage of a line node based on a current reference value and a voltage reference value;

[0082] Step S202 includes the following sub-steps:

[0083] See also Figure 3 As shown, step S2021, with L n n is the X-axis, and the current reference value is the Y-axis to establish a plane rectangular coordinate system, named the current reference distribution diagram, and L n And the corresponding current reference value is entered into the current reference distribution diagram;

[0084] Step S2022, with L n n is the X-axis, and the voltage reference value is the Y-axis to establish a plane rectangular coordinate system, named voltage reference distribution diagram, and L n and the corresponding voltage reference value is entered into the voltage reference distribution diagram;

[0085] Step S2023, performing polynomial regression on the current reference distribution diagram and the voltage reference distribution diagram respectively to obtain a current reference function and a voltage reference function;

[0086] Step S2024: Substitute n into the current reference function and the voltage reference function to calculate L n The reference current and reference voltage are represented by the symbols IN n and VN n express;

[0087] In the specific implementation, the current reference distribution diagram is constructed as follows: Figure 3As shown, the current reference function obtained by polynomial regression is YI = -0.00003 × X 2 -0.0061×X+3000.1, where YI is the current reference value and X is L n In the same way, the voltage reference function is YV=0.000005×X 2 -0.0022×X+500.08, where YV is the voltage reference value; since there are 48 line nodes in total, the specific reference current and reference voltage of each line node are not shown in this embodiment. n The corresponding reference current and reference voltage can be obtained by substituting the corresponding n into the current reference function and the voltage reference function.

[0088] Step S3, when a fault occurs in the circuit system, the current increment and voltage increment of different line nodes are calculated; Step S3 includes the following sub-steps:

[0089] Step S301, when a circuit system fails, real-time current and real-time voltage are obtained;

[0090] Step S302, calculate the real-time current by the current reference value calculation formula to obtain the current real-time reference value; calculate the real-time voltage by the voltage reference value calculation formula to obtain the voltage real-time reference value, respectively by IF n and VF n express;

[0091] Step S303, calculating ΔI n =IF n -IN n , where ΔI n For L n The current increment;

[0092] Step S304, calculate ΔV n =VF n -VN n , where ΔV n For L n The voltage increment;

[0093] In the specific implementation, take L1 as an example, at this time n = 1, the real-time current IF1 is monitored to be 3372.46A, and the real-time voltage VF1 is 521.745kV. Substitute X = 1 into YI = -0.00003 × X 2 -0.0061×X+3000.1 and YV=0.000005×X 2 -0.0022×X+500.08, the solution is YI=IN1 is 3000.0938A, YV=VN nIt is 500.077805. Through calculation, we get ΔI1=3372.46-3000.0938=372.3662, ΔV1=521.745-500.077805=21.667195.

[0094] Step S4, based on the topology diagram, the current increment and the voltage increment, the line of the fault point is selected by the line-pulling increment method; Step S4 includes the following sub-steps:

[0095] Step S401, obtaining a safe range of current increment based on normal current increment analysis, and marking it as a current safety range;

[0096] Step S401 includes the following sub-steps:

[0097] See also Figure 4 As shown, step S4011, with L n The n in the figure is the horizontal axis, and the current increment is the vertical axis to establish a plane rectangular coordinate system, which is named as the current range scatter plot;

[0098] Step S4012: record the history in L n The corresponding normal current increment is recorded in the current range scatter diagram, and the coordinate points in the current range scatter diagram are named as current increment points;

[0099] Step S4013, performing polynomial regression on the current range scatter plot to obtain a current safety function, plotting the current safety function in the current range scatter plot, and naming a curve corresponding to the current safety function as a current safety curve;

[0100] See also Figure 5 As shown, in step S4014, the current safety curve is moved vertically in the positive direction of the Y axis to monitor the distribution of the current increment points. When there is no current increment point above the current safety curve, the movement is stopped, and the current safety curve at this time is named as the current safety range curve, and the function corresponding to the current safety range curve is named as the current safety range function;

[0101] Step S4015, substitute n into the current safety range function and mark the calculated result as R n , the range [0, R n ] Marked as L n Current safety range;

[0102] In the specific implementation, the current range scatter diagram is constructed as follows: Figure 4 As shown, the current safety function obtained by polynomial regression is YSI = 0.0004 × X 2 +0.0355×X+101.44, where YSI is the current increment. After moving, the current safety range curve is as follows: Figure 5As shown, the current safety range function is YSI = 0.0004 × X 2 +0.0355×X+103.7214, taking line node L1 as an example, at this time n=1, substitute X=1 into YSI=0.0004×X 2 +0.0355×X+103.7214, we get R1=103.7573, so the current safety range of L1 is [0,103.7573];

[0103] Step S402, obtaining a safe range of voltage increment based on a normal voltage increment analysis, and marking it as a voltage safety range;

[0104] Step S402 includes the following sub-steps:

[0105] Step S4021, with L n The n in the figure is the horizontal axis, and the voltage increment is the vertical axis to establish a plane rectangular coordinate system, which is named voltage range scatter plot;

[0106] Step S4022: record the L n The corresponding normal voltage increment is entered into the voltage range scatter plot, and the coordinate points in the voltage range scatter plot are named voltage increment points;

[0107] Step S4023, performing polynomial regression on the voltage range scatter plot to obtain a voltage safety function, plotting the voltage safety function in the voltage range scatter plot, and naming a curve corresponding to the voltage safety function as a voltage safety curve;

[0108] Step S4024, vertically moving the voltage safety curve in the positive direction of the Y axis, monitoring the distribution of voltage increment points, and stopping the movement when there is no voltage increment point above the voltage safety curve, naming the voltage safety curve at this time as a voltage safety range curve, and naming the function corresponding to the voltage safety range curve as a voltage safety range function;

[0109] Step S4025, substitute n into the voltage safety range function and mark the calculated result as E n , the range [0, E n ] Marked as L n Voltage safety range;

[0110] In the specific implementation, the analysis process of the voltage safety range function is exactly the same as the analysis process of the current safety range function, so it is not described in detail in this embodiment, and only the final result is shown. Referring to the analysis process of the current safety range function, the voltage safety range function is obtained as YVI=-0.00008×X 2-0.0082×X+24.3427, where YVI is the voltage increment. Taking L1 as an example, n=1, and E1=24.33442 is calculated, so the voltage safety range of L1 is [0,24.33442];

[0111] Step S403, based on the current safety range and the voltage safety range, combined with the topology diagram, analyze and select the line for the fault point;

[0112] Step S403 includes the following sub-steps:

[0113] Step S4031, for line node L n , the ΔI calculated in real time n With R n For comparison, if ΔI n Less than or equal to R n , then the output current increment is normal signal; if ΔI n Greater than R n , then the output current increment abnormal signal;

[0114] Step S4032: for line node L n , the ΔV calculated in real time n With E n For comparison, if ΔV n Less than or equal to E n , then the output voltage increment is a normal signal; if ΔV n Greater than E n , then the output voltage increment abnormal signal;

[0115] Step S4033: Mark the line node that outputs the abnormal current increment signal or the abnormal voltage increment signal as an abnormal node, and number the abnormal node, using the symbol P m Represents, where m is a positive integer and m is the serial number of P;

[0116] In the specific implementation, taking the line node L1 as an example, the calculated ΔI1=372.3662, ΔV1=21.667195 in this embodiment, while R1=103.7573, E1=24.33442, by comparison, it is found that ΔI1 is greater than R1, and the current increment abnormal signal is output, ΔV1 is less than E1, and the voltage increment normal signal is output. Since the current increment abnormal signal is output for L1, the line node L1 is marked as an abnormal node. The line nodes are usually numbered according to L n In n, sort them from small to large, and mark the abnormal node L1 as P1. n After the analysis is completed, the abnormal nodes P1 to P 12 ;

[0117] See also Figure 6 As shown, step S4034, for any P m , will be in the topology diagram with P m The adjacent line nodes connected by the line are named as adjacent nodes, and whether there are abnormal nodes in the adjacent nodes is detected. If there are no abnormal nodes in the adjacent nodes, a fault line signal is output; if there are abnormal nodes in the adjacent nodes, a deep line selection signal is output;

[0118] Step S4035: if a deep line selection signal is output, adjacent abnormal nodes connected by lines in the topology diagram are marked as connecting nodes, and the maximum value of the current increment and the maximum value of the voltage increment in the connecting node are obtained and marked as the maximum current increment and the maximum voltage increment respectively;

[0119] In the specific implementation, abnormal nodes such as Figure 6 As shown, Figure 6 In the example, L1 and L2 are connected by a line. For L1, L2 is the adjacent node of L1. The adjacent node of P1 is only L2, and L2 is not an abnormal node. Therefore, a fault line selection signal is output to mark P1 as the fault point. Since all the line nodes adjacent to P1 are normal nodes, it indicates that the power lines connected between them are not faulty. At this time, only the line node itself has a fault. At the same time, Figure 6 In P2, P3, P5, P7, P8, P9, P 10 , P 11 and P 12 That is, it is a link node. P4 and P6 also constitute a link node. For P2, there are P3 and P5 in the adjacent nodes, so the deep line selection signal is output. In the link node where P2 is located, the maximum current increment and the maximum voltage increment are 287.463A and 28.4635kV respectively.

[0120] Step S4036, marking the abnormal nodes corresponding to the maximum current increment and the maximum voltage increment as fault nodes, and outputting a single node signal if the fault nodes are the same abnormal node; and outputting a double node signal if the fault nodes are different abnormal nodes;

[0121] Step S4037: if a single-node signal is output, the abnormal node with the second largest current increment and voltage increment among the connected nodes is obtained, and the faulty node and the connection between them are marked as faulty lines;

[0122] Step S4038: if a dual-node signal is output, the connection between the two faulty nodes is marked as a faulty line;

[0123] In the specific implementation, the fault node corresponding to the maximum current increment is found to be P8, and the fault node corresponding to the maximum voltage increment is P 10The faulty nodes are not the same node, so a dual-node signal is output and the connection between the two faulty nodes is marked as a faulty line, that is, P8 to P9 and then to P 10 The power lines between are marked as faulty lines.

[0124] Example 2, please refer to Figure 7 As shown, Figure 7 The structural schematic diagram of an electronic device is illustrated, and the electronic device may include: a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory communicate with each other through the communication bus. The memory stores computer-readable instructions, and the processor may call the instructions in the memory. When the computer-readable instructions are executed by the processor, the steps in a line selection method for judging a fault point based on the pull-line increment method are executed to achieve the following functions: installing monitoring sensors on line nodes, monitoring the current and voltage of line nodes, and obtaining a topological diagram of the power line at the same time; analyzing the reference current and reference voltage of line nodes during normal operation; calculating the current increment and voltage increment of different line nodes when a circuit system fails; and selecting the fault point through the pull-line increment method based on the topological diagram, current increment and voltage increment.

[0125] In addition, the logic instructions in the above-mentioned memory can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art, and the computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a disk or an optical disk.

[0126] Embodiment 3, the present application also provides a computer program product, the computer program product includes a computer program stored on a computer-readable storage medium, the computer program includes program instructions, when the program instructions are executed by the computer, the computer can execute a line selection method based on the line increment method provided by the above methods to determine the fault point, the method includes: installing monitoring sensors on the line nodes, monitoring the current and voltage of the line nodes, and obtaining the topology map of the power line at the same time; analyzing the reference current and reference voltage of the line nodes during normal operation; when a circuit system fails, calculating the current increment and voltage increment of different line nodes; based on the topology map, current increment and voltage increment, selecting the fault point through the line increment method.

[0127] Embodiment 4, the present application also provides a computer-readable storage medium, the present application provides a storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the line selection method based on the pull-line increment method for determining the fault point are executed to achieve the following functions: installing monitoring sensors on the line nodes to monitor the current and voltage of the line nodes, and obtaining a topology map of the power line at the same time; analyzing the reference current and reference voltage of the line nodes during normal operation; calculating the current increment and voltage increment of different line nodes when a circuit system fails; based on the topology map, current increment and voltage increment, selecting the fault point through the pull-line increment method.

[0128] Through the description of the above implementation methods, the embodiments of the present invention can be provided as methods, systems or computer program products. Based on such an understanding, the above technical solutions can be essentially or partly contributed to the prior art in the form of software products, which can be stored in a computer-readable storage medium, such as ROM / RAM, a magnetic disk, an optical disk, etc., and include several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0129] In the embodiments provided in the present application, it should be understood that the disclosed system or method can be implemented in other ways. The embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, multiple modules or units can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of systems, modules and units can be electrical, mechanical or other forms.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A line selection method based on the pull-line increment method to determine the fault point, characterized in that: The steps include: Install monitoring sensors on line nodes to monitor the current and voltage of line nodes and obtain the topology of power lines; Analyze the reference current and reference voltage of the line nodes during normal operation; When a circuit system fails, the current increment and voltage increment of different line nodes are calculated; Based on the topology diagram, current increment and voltage increment, the fault point is selected by the line-pulling increment method.

2. A line selection method based on the pull-line increment method for determining the fault point according to claim 1, characterized in that: Installing monitoring sensors on line nodes to monitor the current and voltage of line nodes and obtaining the topology of power lines includes the following sub-steps: Installing monitoring sensors on line nodes, wherein the monitoring sensors include an ammeter and a voltmeter; The current and voltage of the line nodes are monitored, and the monitored current and voltage are named monitoring current and monitoring voltage respectively; Get the topology of the power line, and number the line nodes in the topology in the order of the distance from the line node to the power generation equipment from small to large. n Represents, where n is a positive integer and n is the sequence number of L.

3. A line selection method based on the pull-line increment method for determining the fault point according to claim 2, characterized in that: Analyzing the reference current and reference voltage of the line node during normal operation includes the following sub-steps: Analyze the current reference value and voltage reference value of the line nodes during normal operation; The reference current and the reference voltage of the line node are obtained based on the current reference value and the voltage reference value.

4. A line selection method based on the pull-line increment method for determining the fault point according to claim 3, characterized in that: Analyzing the current reference value and voltage reference value of the line node during normal operation includes the following sub-steps: Obtaining a temperature coefficient of a monitoring sensor, wherein the temperature coefficient includes a current coefficient and a voltage coefficient; Monitoring L n Real-time current and real-time voltage, and real-time temperature; By formula V n (0) = V n / (SV×T) to calculate the voltage reference value, where V n (0) is L n The voltage reference value, V n For L n The real-time voltage, SV is the voltage coefficient, and T is the real-time temperature; By formula I n (0) = I n / (SA×T) calculates the current reference value, where I n (0) is L n The current reference value, I n For L n The real-time voltage, SA is the current coefficient.

5. A line selection method based on the pull-line increment method for determining the fault point according to claim 4, characterized in that: Analyzing and obtaining a reference current and a reference voltage of a line node based on a current reference value and a voltage reference value includes the following sub-steps: L n n is the X-axis, and the current reference value is the Y-axis to establish a plane rectangular coordinate system, named the current reference distribution diagram, and L n And the corresponding current reference value is entered into the current reference distribution diagram; L n n is the X-axis, and the voltage reference value is the Y-axis to establish a plane rectangular coordinate system, named voltage reference distribution diagram, and L n and the corresponding voltage reference value is entered into the voltage reference distribution diagram; Performing polynomial regression on the current reference distribution diagram and the voltage reference distribution diagram respectively to obtain a current reference function and a voltage reference function; Substitute n into the current reference function and the voltage reference function respectively to calculate L n The reference current and reference voltage are represented by the symbols IN n and VN n express.

6. A line selection method based on the pull-line increment method for determining the fault point according to claim 5, characterized in that: When a circuit system fails, calculating the current increment and voltage increment of different line nodes includes the following sub-steps: When a circuit system fails, obtain real-time current and real-time voltage; The real-time current is calculated by the current reference value calculation formula to obtain the real-time current reference value; the real-time voltage is calculated by the voltage reference value calculation formula to obtain the real-time voltage reference value. n and VF n express; Calculate ΔI n =IF n -IN n , where ΔI n For L n The current increment; Calculate ΔV n =VF n -VN n , where ΔV n For L n The voltage increment.

7. A line selection method based on the pull-line increment method for determining the fault point according to claim 6, characterized in that: Based on the topology diagram, current increment and voltage increment, the fault point selection by the pull-line increment method includes the following sub-steps: Based on the normal current increment analysis, the safety range of the current increment is obtained and marked as the current safety range; Based on the normal voltage increment analysis, the safety range of voltage increment is obtained and marked as voltage safety range; Based on the current safety range and voltage safety range, combined with the topology diagram, analysis is performed to select the line for the fault point.

8. A line selection method based on the pull-line increment method for determining the fault point according to claim 7, characterized in that: The safety range of the current increment is obtained based on the normal current increment analysis, which is marked as the current safety range and includes the following sub-steps: L n The n in the figure is the horizontal axis, and the current increment is the vertical axis to establish a plane rectangular coordinate system, which is named as the current range scatter plot; Record the history in n The corresponding normal current increment is recorded in the current range scatter diagram, and the coordinate points in the current range scatter diagram are named as current increment points; Performing polynomial regression on the current range scatter plot to obtain a current safety function, plotting the current safety function in the current range scatter plot, and naming a curve corresponding to the current safety function as a current safety curve; Move the current safety curve vertically toward the positive direction of the Y axis, monitor the distribution of the current increment points, and stop moving when there is no current increment point above the current safety curve. Name the current safety curve at this time as the current safety range curve, and name the function corresponding to the current safety range curve as the current safety range function; Substitute n into the current safety range function and mark the calculated result as R n , the range [0, R n ] Marked as L n Current safety range.

9. A line selection method based on the pull-line increment method for determining the fault point according to claim 8, characterized in that: The safety range of voltage increment is obtained based on the normal voltage increment analysis, which is marked as voltage safety range and includes the following sub-steps: L n The n in the figure is the horizontal axis, and the voltage increment is the vertical axis to establish a plane rectangular coordinate system, which is named voltage range scatter plot; Record the history in n The corresponding normal voltage increment is entered into the voltage range scatter plot, and the coordinate points in the voltage range scatter plot are named voltage increment points; Perform polynomial regression on the voltage range scatter plot to obtain a voltage safety function, plot the voltage safety function on the voltage range scatter plot, and name the curve corresponding to the voltage safety function a voltage safety curve; Move the voltage safety curve vertically in the positive direction of the Y axis, monitor the distribution of voltage increment points, and stop moving when there is no voltage increment point above the voltage safety curve. Name the voltage safety curve at this time as a voltage safety range curve, and name the function corresponding to the voltage safety range curve as a voltage safety range function; Substitute n into the voltage safety range function and mark the calculated result as E n , the range [0, E n ] Marked as L n Voltage safety range.

10. A line selection method based on the pull-line increment method to determine the fault point according to claim 9, characterized in that: Based on the current safety range and voltage safety range, combined with the topology diagram, the line selection for the fault point includes the following sub-steps: For line node L n , the ΔI calculated in real time n With R n For comparison, if ΔI n Less than or equal to R n , then the output current increment is normal signal; If ΔI n Greater than R n , then the output current increment abnormal signal; For line node L n , the ΔV calculated in real time n With E n For comparison, if ΔV n Less than or equal to E n , then the output voltage increment is a normal signal; if ΔV n Greater than E n , then the output voltage increment abnormal signal; The line nodes that output abnormal current increment signals or abnormal voltage increment signals are marked as abnormal nodes, and the abnormal nodes are numbered and marked with symbols P m Represents, where m is a positive integer and m is the serial number of P; For any P m , will be in the topology diagram with P m The adjacent line nodes connected by the line are named adjacent nodes, and whether there are abnormal nodes in the adjacent nodes is detected. If there are no abnormal nodes in the adjacent nodes, a fault line signal is output; if there are abnormal nodes in the adjacent nodes, a deep line selection signal is output; If a deep line selection signal is output, adjacent abnormal nodes connected by lines in the topology diagram are marked as connecting nodes, and the maximum value of the current increment and the maximum value of the voltage increment in the connecting node are obtained and marked as the maximum current increment and the maximum voltage increment respectively; The abnormal nodes corresponding to the maximum current increment and the maximum voltage increment are marked as fault nodes. If the fault nodes are the same abnormal node, a single node signal is output; if the fault nodes are different abnormal nodes, a double node signal is output; If a single-node signal is output, the abnormal node with the second largest current increment and voltage increment among the connected nodes is obtained, and the faulty node and the connection between them are marked as the faulty line; If a dual-node signal is output, the connection between the two faulty nodes is marked as a faulty line.

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