Line parameter checking method based on line impedance analysis matching and related device

Abstract

The invention discloses a line parameter checking method based on line impedance analysis matching and a related device. The method comprises the following steps: determining a to-be-checked line in a power distribution network; determining the type of the to-be-checked line according to the parameters of the to-be-checked line, wherein the type of the to-be-checked line comprises a line of which both ends are measured, a line of which the head end is measured and the tail end is not measured, a line of which the head end is not measured and the tail end is measured, and a line of which both ends are not measured; according to the topological structure of the power distribution network and the type of the line to be checked, the parameters of the line to be checked are checked based on the line impedance in a tracing mode, and the method and the related device can achieve accurate checking of the line parameters in the power distribution network.

Description

Technical Field

[0001] The present invention belongs to the technical field of distribution network line parameter verification, and relates to a line parameter verification method based on line impedance analysis and matching and a related device. Background Art

[0002] As the terminal of the power system, the distribution network is directly connected to users, and its operating status is directly related to the reliability of power supply. For distribution network operation and management departments, timely and accurate acquisition of the real-time operating status of the distribution network has become a prerequisite for ensuring safe and reliable power supply. The current distribution network has limited data types available, low acquisition frequency, scattered terminal locations, and low transparency. As a result, business applications have problems such as insufficient monitoring capabilities for global abnormal status of the distribution network, untimely topology updates, and low accuracy in branch line operation monitoring and feeder automation fault diagnosis. At the same time, there are also problems with inaccurate line parameters in the distribution network caused by incorrect or missing ledger information or changes in ambient temperature, making it impossible to accurately verify line parameters in the distribution network. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a line parameter calibration method and related devices based on line impedance analysis and matching, which can realize accurate calibration of line parameters in the distribution network.

[0004] To achieve the above object, the present invention discloses a line parameter verification method based on line impedance analysis and matching, comprising:

[0005] Determine the lines to be verified in the distribution network;

[0006] Determining the type of the line to be calibrated based on the parameters of the line to be calibrated, wherein the types of the line to be calibrated include a line with measurements at both ends, a line with measurements at the first end but not at the second end, a line with no measurements at the first end but not at the second end, and a line with no measurements at both ends;

[0007] According to the topological structure of the distribution network and the type of the line to be checked, the parameters of the line to be checked are checked based on the line impedance in a retrospective manner.

[0008] The line parameter verification method based on line impedance analysis and matching described in the present invention is further improved in that:

[0009] Furthermore, when the line to be verified is a line with measurements at both ends, the process of verifying the parameters of the line to be verified based on the line impedance in a retrospective manner according to the topology of the distribution network and the type of the line to be verified is as follows:

[0010] According to the relationship between voltage and impedance, the parameters of the circuit to be checked are judged to be qualified;

[0011] When the parameters of the circuit to be checked are qualified, the parameters of the circuit to be checked are saved;

[0012] When the parameters of the line to be checked are unqualified, the head-end measurement of the line to be checked is fixed, and according to the topology of the distribution network, a downward tracing method is adopted to determine whether the head-end measurement of the line to be checked is accurate based on the line impedance. When the head-end measurement of the line to be checked is accurate, according to the topology of the distribution network, a downward tracing method is adopted to calibrate the parameters of the end of the line to be checked based on the line impedance; otherwise, the end measurement of the line to be checked is fixed, and according to the topology of the distribution network, an upward tracing method is adopted to calibrate the parameters of the head-end of the line to be checked based on the line impedance.

[0013] Furthermore, when the line to be checked is a line with measurement at the head end but not at the end end, the parameters of the end of the line to be checked are checked based on line impedance in a tracing back manner according to the topology of the distribution network.

[0014] Furthermore, when the line to be checked is a line with no measurement at the head end but measurement at the tail end, the parameters of the head end of the line to be checked are checked based on line impedance in an upward tracing manner according to the topology of the distribution network.

[0015] Furthermore, the process of verifying the parameters of the end of the line to be verified based on the line impedance in a tracing back manner according to the topology of the distribution network is as follows:

[0016] According to the topology of the distribution network, trace back to find the next node with measurement, calculate the equivalent impedance between the head end and the next node with measurement through star-delta transformation according to the parameter table, and calculate the impedance between the head end and the next node with measurement based on the measured voltage and current of the head end and the next node with measurement. When the deviation between the calculated impedance and the calculated equivalent impedance is less than a preset deviation threshold, assign the parameters of the next node with measurement to the end of the line to be verified; otherwise, continue tracing back;

[0017] Furthermore, the process of verifying the parameters of the head end of the line to be verified based on the line impedance in an upward manner according to the topology of the distribution network is as follows:

[0018] According to the topological structure of the distribution network, the previous node with measurement is searched upstream, and the equivalent impedance between the terminal and the previous node with measurement is obtained through star-delta transformation according to the parameters in the parameter table. At the same time, the impedance between the terminal and the previous node with measurement is calculated based on the measured voltage and current of the terminal and the previous node with measurement. When the deviation between the calculated impedance and the equivalent impedance is less than the preset deviation threshold, the parameters of the previous node with measurement are assigned to the head end of the line to be verified; otherwise, the upstream process continues.

[0019] Furthermore, when the line to be verified is a line with no measurement at both ends, the process of verifying the parameters of the line to be verified based on the line impedance in a retrospective manner according to the topology of the distribution network and the type of the line to be verified is as follows:

[0020] According to the topological structure of the distribution network, trace back to find the previous measured node, and trace back to find the next measured node. According to the parameters in the parameter table, the equivalent impedance between the next measured node and the previous measured node is obtained through star-delta transformation. At the same time, based on the measured voltage and current of the next measured node and the previous measured node, the impedance between the next measured node and the previous measured node is calculated. When the deviation between the calculated impedance and the equivalent impedance is less than the preset deviation threshold, the parameters of the previous measured node are assigned to the head end of the line to be verified, and the parameters of the next measured node are assigned to the end of the line to be verified. Otherwise, continue to trace back upstream and downstream.

[0021] The present invention discloses a line parameter verification system based on line impedance analysis and matching, comprising:

[0022] A first determination module is used to determine the line to be verified in the distribution network;

[0023] a second determining module, configured to determine a type of the line to be calibrated based on parameters of the line to be calibrated, wherein the types of the line to be calibrated include a line with measurements at both ends, a line with measurements at the first end but not at the second end, a line with no measurements at the first end but not at the second end, and a line with no measurements at both ends;

[0024] The verification module is used to verify the parameters of the line to be verified based on the line impedance in a retrospective manner according to the topological structure of the distribution network and the type of the line to be verified.

[0025] The present invention discloses a computer device, comprising a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the computer program, the steps of the line parameter verification method based on line impedance analysis and matching are implemented.

[0026] The present invention discloses a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the steps of the line parameter verification method based on line impedance analysis and matching are implemented.

[0027] The present invention has the following beneficial effects:

[0028] During specific operation, the line parameter verification method and related device based on line impedance analysis and matching described in the present invention adopt a retrospective approach to verify the parameters of the line to be verified based on the line impedance according to the topological structure of the distribution network and the type of the line to be verified, so as to eliminate problematic measurements and reconstruct the structure and parameters of the feeder using accurate and effective measurements, thus being extremely practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0030] Figure 1 Schematic diagram of star-delta transformation;

[0031] Figure 2 is a flow chart of the method of the present invention;

[0032] Figure 3 Flowchart of the matching process. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] In the description of the present invention, it is to be understood that the terms “include” and “comprise” indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0035] It should also be understood that the terms used in the present specification are only for the purpose of describing particular embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0036] It should be further understood that the term "and / or" as used in the present specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0037] It should be understood that although the terms "first," "second," and "third" may be used to describe preset ranges in embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are merely used to distinguish one preset range from another. For example, without departing from the scope of embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0038] The word "if," as used herein, may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to the determination" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)," depending on the context.

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] The accompanying drawings illustrate various schematic diagrams of structures according to embodiments disclosed herein. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes of the various regions and layers shown in the figures, as well as their relative sizes and positional relationships, are merely exemplary and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions as needed.

[0041] As is known to all, delta conversion refers to the process of converting between star (Y) connection and delta (Δ) connection in a three-phase circuit. In star connection, the ends of the three coils are connected together to form a common point, usually called the neutral point. In delta connection, the three coils are connected end to end to form a closed loop. Star-delta conversion is commonly used for starting and running motors to reduce starting current and provide different voltage and power outputs. The schematic diagram of star-delta conversion is shown as follows: Figure 1 As shown, the three variables r1, r2, and r3 represent the resistance of the three branches in the star network, and R 12 、R 23 、R 13 Represents the resistance of the three branches in a triangle network.

[0042] The star is transformed into a triangle, that is:

[0043]

[0044] The triangle transforms into a star, that is:

[0045]

[0046] Voltage drop formula: Assuming the voltage at the end of the line is known Line impedance Z=R+jX, complex power The first-end voltage can be calculated directly from the line impedance Specifically:

[0047]

[0048] Voltage drop on the line Right now:

[0049]

[0050] Example 1

[0051] refer to Figure 2 The line parameter verification method based on line impedance analysis and matching of the present invention comprises the following steps:

[0052] 1) According to the topology of the target distribution network, select the feeders that need line parameter verification.

[0053] 2) Obtain all parameters of the feeder, including current, load factor, node voltage, node power generation, and node load of all lines under different switch state topologies;

[0054] 3) Determining the type of the circuit to be calibrated based on its parameters, wherein the types of circuits to be calibrated include circuits with measurements at both ends, circuits with measurements at the head end but not at the tail end, circuits with no measurements at the head end but not at the tail end, and circuits with no measurements at both ends;

[0055] 4) calibrating the circuit to be verified according to the type of the circuit to be verified;

[0056] When the circuit to be calibrated is a circuit with measurements at both ends, the process of calibrating the circuit to be calibrated is as follows:

[0057] 41) Select a topology corresponding to a switching state on the feeder for analysis.

[0058] 42) For the circuit to be checked, judging whether the parameters of the circuit to be checked are qualified according to the relationship between voltage and impedance;

[0059] 43) When the parameters of the circuit to be checked are qualified, the parameters of the circuit to be checked are saved;

[0060] 44) When the parameters of the line to be verified are unqualified, the head-end measurement of the line to be verified is fixed, the terminal measurement of the line to be verified is discarded, and the next node with measurement is traced back according to the topology of the distribution network. Then, through star-delta transformation, the equivalent impedance between the head-end and the next node with measurement is obtained, and the impedance of the line to be verified is calculated based on the voltage and current between the head-end and the terminal of the line to be verified. When the deviation between the equivalent impedance and the impedance of the line to be verified is greater than or equal to a preset deviation threshold, it is determined that the head-end measurement is inaccurate, and the process goes to step 46). Otherwise, it is determined that the head-end measurement is accurate, and the process goes to step 45);

[0061] When the parameters of the line to be checked are unqualified, the end measurement of the line to be checked is fixed, the head-end measurement of the line to be checked is discarded, and according to the topology of the distribution network, the previous node with measurement is traced back to find the equivalent impedance between the previous node with measurement and the end node through star-delta transformation. At the same time, the impedance of the line to be checked is calculated based on the voltage and current of the line to be checked. When the deviation between the impedance of the line to be checked and the equivalent impedance is greater than or equal to a preset deviation threshold, the end measurement is considered inaccurate, and the process goes to step 45); otherwise, the end measurement is considered accurate, and the process goes to step 46);

[0062] 45) When the line to be verified is a line with measurement at the head end but not at the end, then according to the topology of the distribution network, trace back to find the next node with measurement, and calculate the equivalent impedance between the head end and the next node with measurement through star-delta transformation according to the parameter table. At the same time, based on the measured voltage and current between the head end and the next node with measurement, calculate the impedance between the head end and the next node with measurement. When the deviation between the calculated impedance and the calculated equivalent impedance is less than a preset deviation threshold, assign the parameters of the next node with measurement to the end of the line to be verified; otherwise, continue tracing back;

[0063] 46) When the line to be verified is a line with no measurement at the head end but measurement at the tail end, then based on the topology of the distribution network, trace back to find the last measured node, and simultaneously obtain the equivalent impedance between the tail end and the last measured node through star-delta transformation based on the parameters in the parameter table. At the same time, calculate the impedance between the tail end and the last measured node based on the measured voltage and current. When the deviation between the calculated impedance and the equivalent impedance is less than a preset deviation threshold, assign the parameters of the last measured node to the head end of the line to be verified. Otherwise, continue tracing back;

[0064] 47) When the line to be verified is a line with no measurement at both ends, the previous measured node is searched upstream, and the next measured node is searched downstream. The equivalent impedance between the next measured node and the previous measured node is obtained through star-delta transformation according to the parameters in the parameter table. At the same time, the impedance between the next measured node and the previous measured node is calculated based on the measured voltage and current. When the deviation between the calculated impedance and the equivalent impedance is less than the preset deviation threshold, the parameters of the previous measured node are assigned to the head end of the line to be verified, and the parameters of the next measured node are assigned to the end of the line to be verified. Otherwise, the upstream and downstream processes are continued.

[0065] Example 2

[0066] According to the results of historical data sorting, data classification is completed first to provide a basis for matching. When abnormal power flow data is detected, the corresponding data is found from the historical data according to the topology and voltage conditions and matched. The corresponding block diagram is as follows: Figure 3 As shown, the specific steps include:

[0067] Based on the processing of historical data on the feeder using the above analysis method, classification is performed based on information such as switch location and topology as the primary index.

[0068] For the reprocessed feeders, that is, the measurement is accurate, and the lines are classified according to the parameters after the first, second, third, and fourth categories, according to the 0.01pu interval of the head-end voltage, that is, 0.97-0.98, 0.98-0.99, 0.99-1.0, 1.0-1.01, 1.01-1.02, 1.02-1.03, 1.03-1.04, 10.04-1.05, 1.05-1.06, 1.06-1.07, ten levels, as the secondary index classification;

[0069] After classification, the measurement points are counted. That is, if a certain point is accurately measured in a measurement, the point measurement count is 1, and if it is not accurate, it is 0. The data in the secondary index classification is counted. If the number of accurate measurements of the point is greater than half of all the data in this category, the point measurement accuracy is considered high and the point measurement is retained. Otherwise, it is deleted. In this way, the measurement determined for the secondary index corresponds to a set of sorted measurements (its position and measurement value).

[0070] When state estimation and power flow calculation after data collection on a feeder indicate that some parameters on the line may be incorrect, the topology is found according to the first-level index, and the voltage is found according to the second-level index. The measurements are matched with the valid measurements (position and voltage) determined under this index. The matching can use common methods such as distance to find the best matching data, thereby correcting the line parameters.

[0071] Check whether the state estimate and the power flow are reasonable. If so, stop; otherwise, start again.

[0072] Example 3

[0073] The line parameter verification system based on line impedance analysis and matching of the present invention comprises:

[0074] A first determination module is used to determine the line to be verified in the distribution network;

[0075] a second determining module, configured to determine a type of the line to be calibrated based on parameters of the line to be calibrated, wherein the types of the line to be calibrated include a line with measurements at both ends, a line with measurements at the first end but not at the second end, a line with no measurements at the first end but not at the second end, and a line with no measurements at both ends;

[0076] The verification module is used to verify the parameters of the line to be verified based on the line impedance in a retrospective manner according to the topological structure of the distribution network and the type of the line to be verified.

[0077] In this embodiment, when the line to be verified is a line with measurements at both ends, the process of calibrating the parameters of the line to be verified based on the line impedance in a retrospective manner according to the topology of the distribution network and the type of the line to be verified is as follows:

[0078] According to the relationship between voltage and impedance, the parameters of the circuit to be checked are judged to be qualified;

[0079] When the parameters of the circuit to be checked are qualified, the parameters of the circuit to be checked are saved;

[0080] When the parameters of the line to be checked are unqualified, the head-end measurement of the line to be checked is fixed, and according to the topology of the distribution network, a downward tracing method is adopted to determine whether the head-end measurement of the line to be checked is accurate based on the line impedance. When the head-end measurement of the line to be checked is accurate, according to the topology of the distribution network, a downward tracing method is adopted to calibrate the parameters of the end of the line to be checked based on the line impedance; otherwise, the end measurement of the line to be checked is fixed, and according to the topology of the distribution network, an upward tracing method is adopted to calibrate the parameters of the head-end of the line to be checked based on the line impedance.

[0081] In this embodiment, when the line to be checked is a line with measurement at the head end but not at the end end, the parameters of the end of the line to be checked are checked based on line impedance in a tracing manner according to the topology of the distribution network.

[0082] In this embodiment, when the line to be checked is a line with no measurement at the head end but measurement at the tail end, the parameters of the head end of the line to be checked are checked based on line impedance in an upward tracing manner according to the topology of the distribution network.

[0083] In this embodiment, the process of verifying the parameters of the end of the line to be verified based on the line impedance in a tracing manner according to the topology of the distribution network is as follows:

[0084] According to the topology of the distribution network, trace back to find the next node with measurement, calculate the equivalent impedance between the head end and the next node with measurement through star-delta transformation according to the parameter table, and calculate the impedance between the head end and the next node with measurement based on the measured voltage and current of the head end and the next node with measurement. When the deviation between the calculated impedance and the calculated equivalent impedance is less than a preset deviation threshold, assign the parameters of the next node with measurement to the end of the line to be verified; otherwise, continue tracing back;

[0085] In this embodiment, the process of verifying the parameters of the head end of the line to be verified based on the line impedance in an upward manner according to the topology of the distribution network is as follows:

[0086] According to the topological structure of the distribution network, the previous node with measurement is searched upstream, and the equivalent impedance between the terminal and the previous node with measurement is obtained through star-delta transformation according to the parameters in the parameter table. At the same time, the impedance between the terminal and the previous node with measurement is calculated based on the measured voltage and current of the terminal and the previous node with measurement. When the deviation between the calculated impedance and the equivalent impedance is less than the preset deviation threshold, the parameters of the previous node with measurement are assigned to the head end of the line to be verified; otherwise, the upstream process continues.

[0087] In this embodiment, when the line to be verified is a line with no measurement at both ends, the process of calibrating the parameters of the line to be verified based on the line impedance in a retrospective manner according to the topology of the distribution network and the type of the line to be verified is as follows:

[0088] According to the topological structure of the distribution network, trace back to find the previous measured node, and trace back to find the next measured node. According to the parameters in the parameter table, the equivalent impedance between the next measured node and the previous measured node is obtained through star-delta transformation. At the same time, based on the measured voltage and current of the next measured node and the previous measured node, the impedance between the next measured node and the previous measured node is calculated. When the deviation between the calculated impedance and the equivalent impedance is less than the preset deviation threshold, the parameters of the previous measured node are assigned to the head end of the line to be verified, and the parameters of the next measured node are assigned to the end of the line to be verified. Otherwise, continue to trace back upstream and downstream.

[0089] The division of modules in the embodiments of the present application is illustrative and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional modules in the various embodiments of the present application may be integrated into a single processor, or may exist physically separately, or two or more modules may be integrated into a single module. The aforementioned integrated modules may be implemented in the form of hardware or software functional modules.

[0090] Example 4

[0091] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the line parameter calibration method based on line impedance analysis and matching are implemented. For example, the steps include: determining a line to be calibrated in a distribution network; determining the type of the line to be calibrated based on the parameters of the line to be calibrated, wherein the types of the line to be calibrated include lines with measurements at both ends, lines with measurements at the head end but not at the tail end, lines with no measurements at the head end but not at the tail end, and lines with no measurements at both ends; and calibrating the parameters of the line to be calibrated based on line impedance using a retroactive method based on the topology of the distribution network and the type of the line to be calibrated. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device. The processor, network interface, and memory are interconnected via an internal bus. The internal bus may be an industrial standard architecture bus, a peripheral component interconnect standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the programs may include program codes, and the program codes include computer operation instructions. The memory may include internal memory and non-volatile memory, and provides instructions and data to the processor.

[0092] Example 5

[0093] A computer-readable storage medium stores a computer program. When executed by a processor, the computer program implements the steps of the line parameter calibration method based on line impedance analysis and matching, for example, including: determining a line to be calibrated in a distribution network; determining the type of the line to be calibrated based on the parameters of the line to be calibrated, wherein the types of the line to be calibrated include lines with measurements at both ends, lines with measurements at the head end but not at the tail end, lines with no measurements at the head end but not at the tail end, and lines with no measurements at both ends; and calibrating the parameters of the line to be calibrated based on the line impedance in a retrospective manner according to the topology of the distribution network and the type of the line to be calibrated. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory and / or cache memory, etc. The non-volatile memory may include read-only memory, hard disk, flash memory, optical disk, magnetic disk, etc.

[0094] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program code.

[0095] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented 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 processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0096] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0097] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0098] Those skilled in the art will readily identify other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0099] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0100] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A line parameter verification method based on line impedance analysis and matching, characterized in that: include: Determine the lines to be verified in the distribution network; Determining the type of the line to be calibrated based on the parameters of the line to be calibrated, wherein the types of the line to be calibrated include a line with measurements at both ends, a line with measurements at the first end but not at the second end, a line with no measurements at the first end but not at the second end, and a line with no measurements at both ends; According to the topological structure of the distribution network and the type of the line to be checked, the parameters of the line to be checked are checked based on the line impedance in a retrospective manner.

2. The line parameter verification method based on line impedance analysis and matching according to claim 1, characterized in that: When the line to be verified is a line with measurements at both ends, the process of verifying the parameters of the line to be verified based on the line impedance in a retrospective manner according to the topology of the distribution network and the type of the line to be verified is as follows: According to the relationship between voltage and impedance, the parameters of the circuit to be checked are judged to be qualified; When the parameters of the circuit to be checked are qualified, the parameters of the circuit to be checked are saved; When the parameters of the line to be checked are unqualified, the head-end measurement of the line to be checked is fixed, and according to the topology of the distribution network, a downward tracing method is used to determine whether the head-end measurement of the line to be checked is accurate based on the line impedance; when the head-end measurement of the line to be checked is accurate, according to the topology of the distribution network, a downward tracing method is used to calibrate the parameters of the end of the line to be checked based on the line impedance; Otherwise, the end of the line to be checked is fixed and the parameters of the head end of the line to be checked are checked based on the line impedance in an upward tracing manner according to the topology of the distribution network.

3. The line parameter verification method based on line impedance analysis and matching according to claim 2, characterized in that: When the line to be checked is a line with measurement at the head end but not at the end end, the parameters of the end of the line to be checked are checked based on line impedance in a tracing manner according to the topology of the distribution network.

4. The line parameter verification method based on line impedance analysis and matching according to claim 2, characterized in that: When the line to be checked is a line that is not measured at the head end but is measured at the tail end, the parameters of the head end of the line to be checked are checked based on line impedance in an upward tracing manner according to the topology of the distribution network.

5. The line parameter verification method based on line impedance analysis and matching according to claim 3, characterized in that: The process of verifying the parameters of the end of the line to be verified based on the line impedance in a tracing back manner according to the topology of the distribution network is as follows: According to the topological structure of the distribution network, trace back to find the next measured node, calculate the equivalent impedance between the head end and the next measured node through star-delta transformation according to the parameter table, and at the same time calculate the impedance between the head end and the next measured node based on the measured voltage and current of the head end and the next measured node. When the deviation between the calculated impedance and the calculated equivalent impedance is less than the preset deviation threshold, the parameters of the next measured node are assigned to the end of the line to be verified; otherwise, continue to trace back.

6. The line parameter verification method based on line impedance analysis and matching according to claim 4, characterized in that: The process of verifying the parameters of the head end of the line to be verified based on the line impedance in an upward manner according to the topology of the distribution network is as follows: According to the topological structure of the distribution network, the previous node with measurement is searched upstream, and the equivalent impedance between the terminal and the previous node with measurement is obtained through star-delta transformation according to the parameters in the parameter table. At the same time, the impedance between the terminal and the previous node with measurement is calculated based on the measured voltage and current of the terminal and the previous node with measurement. When the deviation between the calculated impedance and the equivalent impedance is less than the preset deviation threshold, the parameters of the previous node with measurement are assigned to the head end of the line to be verified; otherwise, the upstream process continues.

7. The line parameter verification method based on line impedance analysis and matching according to claim 1, characterized in that: When the line to be checked is a line with no measurement at both ends, the process of checking the parameters of the line to be checked based on the line impedance in a retrospective manner according to the topology of the distribution network and the type of the line to be checked is as follows: According to the topological structure of the distribution network, trace back to find the previous measured node, and trace back to find the next measured node. According to the parameters in the parameter table, the equivalent impedance between the next measured node and the previous measured node is obtained through star-delta transformation. At the same time, based on the measured voltage and current of the next measured node and the previous measured node, the impedance between the next measured node and the previous measured node is calculated. When the deviation between the calculated impedance and the equivalent impedance is less than the preset deviation threshold, the parameters of the previous measured node are assigned to the head end of the line to be verified, and the parameters of the next measured node are assigned to the end of the line to be verified. Otherwise, continue to trace back upstream and downstream.

8. A line parameter verification system based on line impedance analysis and matching, characterized in that: include: A first determination module is used to determine the line to be verified in the distribution network; a second determining module, configured to determine a type of the line to be calibrated based on parameters of the line to be calibrated, wherein the types of the line to be calibrated include a line with measurements at both ends, a line with measurements at the first end but not at the second end, a line with no measurements at the first end but not at the second end, and a line with no measurements at both ends; The verification module is used to verify the parameters of the line to be verified based on the line impedance in a retrospective manner according to the topological structure of the distribution network and the type of the line to be verified.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the line parameter calibration method based on line impedance analysis and matching as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the line parameter calibration method based on line impedance analysis and matching as described in any one of claims 1 to 7 are implemented.

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