Distribution line distance measurement scheme evaluation method and system

Abstract

The invention discloses a distribution line distance measurement scheme evaluation method and system, and the method comprises the steps: obtaining to-be-selected N distance measurement schemes of a distribution line, and distribution line parameters; establishing an evaluation hierarchical structure of the distance measurement schemes, calculating the weight of each distance measurement scheme to a target layer by adopting an analytic hierarchy process based on the established evaluation hierarchical structure, and calculating the average distance measurement error of the distance measurement schemes; and calculating a benefit evaluation score of each distance measurement scheme according to the distribution line parameters and the average distance measurement error of each distance measurement scheme, and outputting the distance measurement scheme corresponding to the highest benefit evaluation score as a final scheme. According to the distance measurement schemes based on different distance measurement principles, an evaluation system of the distance measurement schemes is constructed by adopting a stagger analysis method and a plurality of influence factors, the distance measurement schemes compatible with distance measurement precision and benefits are obtained, and reference is provided for power supply enterprises to select the distance measurement schemes.

Description

Technical Field

[0001] The present invention relates to the technical field of distance measurement scheme evaluation, and in particular to an evaluation method and system for a distance measurement scheme for a power distribution line. Background Art

[0002] After years of research and testing, the main fault distance measurement methods with feasibility for application in distribution lines are the traveling wave method, the impedance method and the voltage gradient method. The traveling wave method has a high distance measurement accuracy when accurately capturing the wave head, but it requires too many technical conditions and is difficult to implement on site. There is also a certain contradiction between the observability of the wave head and the economy of the solution. The impedance method is economical and easy to implement on site, but it requires a more complex algorithm to eliminate the influence of transition resistance. The voltage gradient method has a simple algorithm, but its distance measurement accuracy in actual application remains to be considered.

[0003] If power supply companies blindly choose solutions with high ranging accuracy and ignore economic efficiency, it will cause poor economic benefits, which is not conducive to the promotion and application of distribution line fault ranging technology; on the contrary, if power supply companies blindly choose solutions with good economic efficiency and ignore ranging accuracy, the effect of fault ranging on reducing line inspection length will be minimal, which is not conducive to the promotion and application of distribution line fault ranging technology. Therefore, how to evaluate and select ranging solutions that are compatible with ranging accuracy and economy is an urgent problem to be solved. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by the present invention is: how to evaluate and select a ranging solution that is compatible with ranging accuracy and economy.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a method for evaluating a distribution line ranging scheme, comprising: obtaining N ranging schemes to be selected for the distribution line, and distribution line parameters; establishing an evaluation hierarchy of the ranging schemes, and based on the established evaluation hierarchy, using a hierarchical analysis method to calculate the weight of each ranging scheme to a target layer, and calculating the average ranging error of the ranging scheme; calculating the benefit evaluation score of each ranging scheme according to the distribution line parameters and the average ranging error of each ranging scheme, and outputting the ranging scheme corresponding to the highest benefit evaluation score as the final scheme.

[0007] As a preferred scheme of the evaluation method of the distribution line distance measurement scheme described in the present invention, the distribution line parameters include the number of line sections, the number of load points in each section, the length of each section, the manual line inspection time and failure rate of each section when the distance measurement scheme is not adopted, the size of each load point in each section, and the unit power outage loss and cost.

[0008] As a preferred scheme of the evaluation method of the distribution line ranging scheme described in the present invention, wherein: the evaluation hierarchy is a target layer, a criterion layer and a scheme layer from top to bottom; the target layer is the average ranging error, the criterion layer includes A elements, and the scheme layer is N ranging schemes to be selected.

[0009] As a preferred solution of the evaluation method of the distribution line distance measurement scheme of the present invention, wherein: the hierarchical analysis method includes: performing pairwise comparison on each distance measurement scheme under each element to establish M scheme judgment matrices, performing pairwise comparison on each element to establish an element judgment matrix;

[0010] When the dimension of the scheme judgment matrix or the factor judgment matrix is ​​greater than 2, the maximum eigenvalue of each scheme judgment matrix and the factor judgment matrix is ​​calculated, and a consistency check is performed on each scheme judgment matrix and the factor judgment matrix. If the consistency check passes, the next step is entered. If the consistency check fails, the scheme judgment matrix and the factor judgment matrix are re-established.

[0011] Select the vector corresponding to the maximum eigenvalue of each scheme judgment matrix as the eigenvector, and normalize the eigenvector to obtain the weight corresponding to each scheme under each factor.

[0012] Select the vector corresponding to the maximum eigenvalue of the factor judgment matrix as the eigenvector, and normalize the eigenvector to obtain the weight ω of each factor m ';

[0013] According to the weight ω of each element m 'Perform a consistency check on the total hierarchical ordering. If the check passes, proceed to the next step. If the check fails, re-establish the scheme judgment matrix and factor judgment matrix;

[0014] According to the weight of each plan under each factor and the weight of each factor ω m 'Calculate the weight ω of each ranging scheme for the target layer j , expressed as:

[0015]

[0016] in, It represents the weight of the jth solution under the mth factor.

[0017] 5. The evaluation method of the distribution line distance measurement scheme according to claim 4, characterized in that: the average distance measurement error of the distance measurement scheme includes the average distance measurement error δ of the i-th distance measurement scheme i , calculate the average ranging error δ of the jth ranging scheme j , expressed as:

[0018]

[0019] Among them, |δ i | represents the absolute value of the average ranging error of the i-th ranging scheme; |δ j | represents the absolute value of the average ranging error of the jth ranging scheme; ω i Represents the weight of the i-th ranging scheme on the target layer.

[0020] As a preferred solution of the evaluation method of the distribution line distance measurement scheme of the present invention, wherein: the average distance measurement error of the distance measurement scheme includes the average distance measurement error δ of the i-th distance measurement scheme i , calculate the average ranging error δ of the jth ranging scheme j , expressed as:

[0021]

[0022] Among them, |δ i | represents the absolute value of the average ranging error of the i-th ranging scheme; |δ j | represents the absolute value of the average ranging error of the jth ranging scheme; ω i Represents the weight of the i-th ranging scheme on the target layer.

[0023] As a preferred solution of the evaluation method of the distribution line distance measurement scheme of the present invention, the benefit evaluation score includes calculating the power outage loss of power users reduced within a statistical period of one year after the power supply enterprise adopts each distance measurement scheme, which is recorded as the power outage loss reduced by the power user, and is expressed as:

[0024]

[0025] Among them, ΔY j1 is the power outage loss reduced by power users after the power supply enterprise adopts the jth distance measurement scheme; x represents the number of sections; h a represents the number of load points in the ath section; l a represents the length of the ath segment; t a represents the manual line patrol time when the distance measurement scheme is not adopted in the ath section; f a represents the failure rate when the distance measurement scheme is not adopted in the ath section; Q ab represents the value of the bth load point in the ath section; y 1ab It represents the unit load power outage loss of the bth load point in the ath section;

[0026] After the power supply enterprise adopts each distance measurement scheme, it is estimated that the loss of the power supply enterprise caused by power shortage during the statistical period of one year is reduced, which is recorded as the power outage loss reduced by the power supply enterprise and expressed as:

[0027]

[0028] Among them, ΔY j2 represents the power outage loss reduced after the power supply enterprise adopts the jth distance measurement scheme; y 2ab It represents the unit load benefit of the bth load point in the ath section;

[0029] Calculate the annual cost of each distance measurement scheme adopted by the power supply enterprise, expressed as:

[0030]

[0031] Among them, C j represents the annual cost of the power supply enterprise adopting the jth distance measurement scheme; γ j is the discount rate of the equipment of the jth ranging solution; d j1 represents the number of traveling wave ranging terminals required for the jth ranging scheme; d j2 represents the number of common distribution terminals required for the jth ranging scheme; c j1 represents the cost of the traveling wave ranging terminal of the jth ranging scheme; c j2 represents the cost of the common distribution terminal of the jth ranging scheme; c j3 represents the cost of the GPRS channel of the jth ranging scheme; e j represents the age of the equipment of the jth ranging scheme;

[0032] Remember ΔY j1 The social benefit X of the power supply company adopting the jth distance measurement scheme j1 , remember X j2 =ΔY j2 -C j is the benefit of the power supply enterprise adopting the jth distance measurement scheme, and the X of each distance measurement scheme is j1 and X j2 The efficiency indicators are standardized and the results are recorded as Z j1 and Z j2 ;

[0033] Z j1 and Z j2 Assign weights α1 and α2 respectively, and calculate the benefit evaluation scores of each ranging scheme:

[0034] z j =α1z j1 +α2z j2

[0035] Among them, z j Represents the benefit evaluation score of the jth ranging scheme.

[0036] As a preferred solution of the evaluation method of the distribution line distance measurement scheme of the present invention, wherein: the standardization processing of the benefit index includes, by the minimum and maximum standardization processing method, X j1 and X j2 Converted to a unified scale comparison, expressed as:

[0037]

[0038] Among them, z j Indicates the normalized index; maxX j The social benefit X of each ranging scheme is j The maximum value in minX j The social benefit X of each ranging scheme j The minimum value in .

[0039] In a second aspect, the present invention also provides an evaluation system for distribution line ranging schemes, including: a data acquisition module for acquiring N ranging schemes to be selected for distribution lines, and distribution line parameters; an evaluation module for establishing an evaluation hierarchy for ranging schemes, and based on the established evaluation hierarchy, using a hierarchical analysis method to calculate the weight of each ranging scheme to a target layer, and calculating an average ranging error of the ranging scheme; a scheme output module for calculating a benefit evaluation score for each ranging scheme based on the distribution line parameters and the average ranging error of each ranging scheme, and outputting the ranging scheme corresponding to the highest benefit evaluation score as the final scheme.

[0040] In a third aspect, the present invention further provides a computing device, comprising: a memory and a processor;

[0041] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the evaluation method of the distribution line distance measurement solution are implemented.

[0042] In a fourth aspect, the present invention further provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the evaluation method of the distribution line ranging scheme.

[0043] Beneficial effects of the present invention: The present invention is based on ranging schemes with different ranging principles, adopts the variance analysis method and multiple influencing factors to construct an evaluation system for ranging schemes, obtains ranging schemes that are compatible with ranging accuracy and efficiency, and provides a reference for power supply companies to select ranging schemes. The present invention combines the specific parameters of the distribution network line, can be specifically analyzed for a specific distribution network line, is applicable to the entire distribution network, and improves the applicability of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0045] Figure 1 An overall flow chart of an evaluation method for a distribution line distance measurement solution provided by an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of the topology and terminal layout of a 10KV distribution line in a certain area according to a method for evaluating a distribution line distance measurement solution provided by a second embodiment of the present invention;

[0047] Figure 3 A hierarchical structure diagram of a method for evaluating a distribution line distance measurement solution provided in a second embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0049] Example 1

[0050] Reference Figure 1 , as an embodiment of the present invention, provides an evaluation method for a distribution line distance measurement scheme, comprising:

[0051] S1: Obtain N distance measurement schemes to be selected for the distribution line and the distribution line parameters.

[0052] Furthermore, the distribution line parameters include the number of line sections, the number of load points in each section, the length of each section, the manual line inspection time and failure rate in each section when no distance measurement scheme is adopted, the size of each load point in each section and the unit power outage loss, and the average distance measurement error of any distance measurement scheme.

[0053] The average ranging error of the ranging scheme is obtained by collecting ranging data on the distribution line, calculating the error of the ranging scheme in each measurement, taking the average of all measurement errors, and obtaining the average ranging error of the i-th ranging scheme, which is expressed as:

[0054]

[0055] Among them, δi represents the average ranging error of the i-th ranging scheme; M ik represents the value of the kth measurement of the i-th ranging scheme; T k represents the true value of the kth measurement, and n represents the number of measurements.

[0056] S2: Establish an evaluation hierarchy of the ranging schemes. Based on the established evaluation hierarchy, use the analytic hierarchy process to calculate the weight of each ranging scheme for the target layer and calculate the average ranging error of the ranging schemes.

[0057] Furthermore, the evaluation hierarchy is composed of target layer, criterion layer and scheme layer from top to bottom; the target layer is the average ranging error, the criterion layer includes A elements, and the scheme layer is the N ranging schemes to be selected.

[0058] Each distance measurement scheme under each element is compared pairwise to establish M scheme judgment matrices, and each element is compared pairwise to establish an element judgment matrix.

[0059] When the dimension of the scheme judgment matrix or the factor judgment matrix is ​​greater than 2, the maximum eigenvalue of each scheme judgment matrix and the factor judgment matrix is ​​calculated, and a consistency check is performed on each scheme judgment matrix and the factor judgment matrix. If the consistency check passes, proceed to the next step. If the consistency check fails, the scheme judgment matrix and the factor judgment matrix are re-established.

[0060] It should be noted that the standard for passing the test is that the random consistency ratio CR of the matrix is ​​less than 0.1, and the matrix is ​​a scheme judgment matrix or an element judgment matrix;

[0061] The random consistency ratio is calculated as:

[0062]

[0063] Among them, CI is the consistency index value, RI is the average random consistency index value;

[0064]

[0065] Among them, λ max is the maximum eigenvalue of the matrix, W is the dimension of the matrix, when the dimension of the matrix W = 3, the average random consistency index value RI is 0.58; when W = 4, the average random consistency index value RI is 0.9.

[0066] Select the vector corresponding to the maximum eigenvalue of each scheme judgment matrix as the eigenvector, and normalize the eigenvector to obtain the weight corresponding to each scheme under each factor.

[0067] Select the vector corresponding to the maximum eigenvalue of the factor judgment matrix as the eigenvector, and normalize the eigenvector to obtain the weight ω of each factor m '.

[0068] According to the weight ω of each element m 'Perform a consistency check on the total hierarchical order. If the check passes, proceed to the next step. If the check fails, re-establish the solution judgment matrix and factor judgment matrix.

[0069] It should be noted that the consistency test standard of the hierarchical total order is that the random consistency ratio CR of the hierarchical total order is less than 0.1. The calculation method of the random consistency ratio of the hierarchical total order is as follows:

[0070]

[0071] Among them, CI m is the consistency index value of the solution judgment matrix of the mth element, RI m is the average random consistency index value of the solution judgment matrix of the mth element.

[0072] According to the weight of each plan under each factor and the weight of each factor ω m 'Calculate the weight ω of each ranging scheme for the target layer j , expressed as:

[0073]

[0074] Among them, ω j m It represents the weight of the jth solution under the mth factor.

[0075] Furthermore, the average ranging error δ of the i-th ranging scheme is i , calculate the average ranging error δ of the jth ranging scheme j , expressed as:

[0076]

[0077] Among them, |δ i | represents the absolute value of the average ranging error of the i-th ranging scheme; |δ j | represents the absolute value of the average ranging error of the jth ranging scheme; ω i Represents the weight of the i-th ranging scheme on the target layer.

[0078] S3: Calculate the benefit evaluation score of each distance measurement scheme based on the distribution line parameters and the average distance measurement error of each distance measurement scheme, and output the distance measurement scheme corresponding to the highest benefit evaluation score as the final scheme.

[0079] Furthermore, after the power supply enterprise adopts each distance measurement scheme, it is estimated that the power outage loss of power users will be reduced within the statistical period of one year, which is recorded as the power outage loss reduced by power users and expressed as:

[0080]

[0081] Among them, ΔY j1 is the power outage loss reduced by power users after the power supply enterprise adopts the jth distance measurement scheme; x represents the number of sections; h a represents the number of load points in the ath section; l a Indicates the length of the ath segment; t a represents the manual line patrol time when the distance measurement scheme is not adopted in the ath section; f a represents the failure rate when the distance measurement scheme is not adopted in the ath section; Q ab represents the value of the bth load point in the ath section; y 1ab It represents the unit load power outage loss at the bth load point in the ath section.

[0082] After the power supply enterprise adopts each distance measurement scheme, it is estimated that the loss of the power supply enterprise caused by power shortage during the statistical period of one year is reduced, which is recorded as the power outage loss reduced by the power supply enterprise and expressed as:

[0083]

[0084] Among them, ΔY j2 represents the power outage loss reduced after the power supply enterprise adopts the jth distance measurement scheme; y 2ab It represents the unit load benefit of the bth load point in the ath section.

[0085] Calculate the annual cost of each distance measurement scheme adopted by the power supply enterprise, expressed as:

[0086]

[0087] Among them, C j represents the annual cost of the power supply enterprise adopting the jth distance measurement scheme; γ j is the discount rate of the equipment for the jth ranging solution; d j1 represents the number of traveling wave ranging terminals required for the jth ranging scheme; d j2 represents the number of common distribution terminals required for the jth ranging scheme; c j1 represents the cost of the traveling wave ranging terminal of the jth ranging scheme; c j2 represents the cost of the common distribution terminal of the jth ranging scheme; c j3 represents the cost of the GPRS channel of the jth ranging scheme; e j Represents the age of the equipment of the jth ranging solution.

[0088] Remember ΔY j1 The social benefit X of the power supply company adopting the jth distance measurement scheme j1 , remember X j2 =ΔY j2 -C j is the benefit of the power supply enterprise adopting the jth distance measurement scheme, and the X of each distance measurement scheme is j1 and X j2 The efficiency indicators are standardized and the results are recorded as Z j1 and Z j2 , is Z j1 and Z j2 Assign weights α1 and α2 respectively, and calculate the benefit evaluation scores of each ranging scheme:

[0089] z j =α1z j1 +α2z j2

[0090] Among them, z j Represents the benefit evaluation score of the jth ranging scheme.

[0091] Through the minimum and maximum standardization method, X j1 and X j2 Converted to a unified scale comparison, expressed as:

[0092]

[0093] Among them, z j Indicates the normalized index; maxX j The social benefit X of each ranging scheme is j The maximum value in minX j The social benefit X of each ranging scheme j The minimum value in .

[0094] The present embodiment also provides an evaluation system for a distribution line ranging scheme, including: a data acquisition module, for acquiring N ranging schemes to be selected for a distribution line, and distribution line parameters; an evaluation module, for establishing an evaluation hierarchy of ranging schemes, and based on the established evaluation hierarchy, using a hierarchical analysis method to calculate the weight of each ranging scheme to a target layer, and calculating an average ranging error of the ranging scheme; a scheme output module, for calculating a benefit evaluation score of each ranging scheme based on the distribution line parameters and the average ranging error of each ranging scheme, and outputting the ranging scheme corresponding to the highest benefit evaluation score as the final scheme.

[0095] This embodiment also provides a computing device, including a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute computer-executable instructions to implement the evaluation method of the distribution line distance measurement solution proposed in the above embodiment.

[0096] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, the evaluation method of the distribution line distance measurement solution proposed in the above embodiment is implemented.

[0097] The storage medium proposed in this embodiment and the evaluation method of the distribution line distance measurement scheme proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0098] Through the above description of the implementation method, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (RandomAccessMemory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0099] Example 2

[0100] Reference Figure 2 and Figure 3 , which is an embodiment of the present invention, provides an evaluation method for a distribution line distance measurement scheme. In order to verify the beneficial effects of the present invention, a scientific demonstration is carried out through simulation experiments.

[0101] like Figure 2 The local topology of a 10KV distribution line in a certain area is shown in the figure. The neutral point of the system is grounded through an arc suppression coil. The line type is an overhead line. Common three-telemetry terminals are arranged on the 2#, 131#, 173# and 232# towers on the main line. The 184# terminal is arranged on the branch line led out of the 162# tower, and the 266# terminal is arranged on the branch line led out of the 195# tower. According to the existing fault section location system, the line can be divided into 7 sections.

[0102] Three ranging schemes are selected. The first ranging scheme is a ranging scheme based on transient traveling wave propagation characteristics, the second ranging scheme is a ranging scheme based on impedance distribution characteristics, and the third ranging scheme is a ranging scheme based on voltage gradient.

[0103] Assume that the failure rate of each section is f i The same, both are 0.5 times / year, the line inspection time t when there is no fault ranging i The same, both are 0.5h.

[0104] There is one industrial load point in section 1, one commercial load point in sections 2, 3 and 4, and three, three and four residential load points in sections 5, 6 and 7 respectively. The size of the industrial load point is 0.8472MW, the size of the commercial load point is 0.4697MW, and the size of the residential load point is 0.1802MW. It is known that the average ranging error of the first ranging scheme is ±200m.

[0105] The evaluation hierarchy of the ranging scheme is established, with M = 4 elements. The first element is the influence of fault conditions on different ranging principles, the second element is the influence of line conditions, the third element is communication dependence, and the fourth element is timing dependence. The established evaluation hierarchy is as follows: Figure 3 shown.

[0106] Based on the established evaluation hierarchy, the analytic hierarchy process is used to calculate the weight of each ranging scheme for the target layer, and the judgment matrix is ​​established for the criterion layer based on the Saaty1-9 method. The scaling principle of the Saaty1-9 method is shown in Table 1.

[0107] Table 1 Scaling principles of Saaty 1-9 method

[0108] Digital Expression Text expression 1 same 3 a little 5 obvious 7 strong 9 extreme 2，4，6，8 Between (e.g. 2 means the degree is between the same and slightly)

[0109] The judgment matrix for each factor of each ranging scheme is shown in Table 2-5, and the factor judgment matrix is ​​shown in Table 6.

[0110] Table 2 Judgment matrix of each scheme for the first element

[0111] Solution 1 Solution 2 Option 3 Solution 1 1 1 / 7 1 / 7 Solution 2 7 1 1 Option 3 7 1 1

[0112] Table 3 Judgment matrix of each scheme for the second element

[0113] Solution 1 Solution 2 Option 3 Solution 1 1 3 1 Solution 2 1 / 3 1 1 / 3 Option 3 1 3 1

[0114] Table 4 Judgment matrix of each scheme for the third element

[0115] Solution 1 Solution 2 Option 3 Solution 1 1 3 3 Solution 2 1 / 3 1 1 Option 3 1 / 3 1 1

[0116] Table 5 Judgment matrix of each scheme for the fourth element

[0117] Solution 1 Solution 2 Option 3 Solution 1 1 9 9 Solution 2 1 / 9 1 1 Option 3 1 / 9 1 1

[0118] Table 6 Factor judgment matrix between factors

[0119] Element 1 The second element The third element The fourth element Element 1 1 5 7 7 The second element 1 / 5 1 3 3 The third element 1 / 7 1 / 3 1 1 The fourth element 1 / 7 1 / 3 1 1

[0120] When the dimension of the scheme judgment matrix or the factor judgment matrix is ​​greater than 2, the maximum eigenvalue of each scheme judgment matrix and the factor judgment matrix is ​​calculated, and a consistency test is performed on each scheme judgment matrix and the factor judgment matrix. If the test passes, the next step is entered. Taking the judgment matrix of the first element of each ranging scheme in Table 2 as an example, the dimension of the matrix is ​​3. After calculation, the maximum eigenvalue of the matrix is ​​3, and CI = 0 is calculated, then CR = 0 < 0.1, and the scheme judgment matrix passes the consistency test.

[0121] The vector corresponding to the maximum eigenvalue of each scheme judgment matrix is ​​selected as the eigenvector, and the eigenvector is normalized to obtain the weight corresponding to each scheme under each factor:

[0122] ω 1 =[0.06670.46670.4667]

[0123] ω 2 =[0.42860.14290.4286]

[0124] ω 3 =[0.60.20.2]

[0125] ω 4 =[0.81810.09090.0909]

[0126] ω 1 Represents the weight vector of each ranging scheme under the first element. The vector corresponding to the maximum eigenvalue of the element judgment matrix is ​​selected as the eigenvector, and the eigenvector is normalized to obtain the weight of each element, ω' = [0.6570.1911 0.076 0.076], and the weight of the first element is ω 1 'That is 0.657, and the weights of other factors are similar.

[0127] The consistency check of the hierarchical total ordering is performed according to the obtained weight of each element. After the check is passed, the weight of each ranging scheme for the target layer is calculated according to the weight corresponding to each scheme under each element and the weight of each element, as shown in Table 7.

[0128] Table 7 Weights of ranging schemes on target layers

[0129] plan Weight Solution 1 0.2335 Solution 2 0.356 Option 3 0.4106

[0130] The average ranging error of each ranging scheme is calculated according to the weight of each ranging scheme to the target layer and the average ranging error of one of the ranging schemes. In this embodiment, the average ranging error of ranging scheme 1 is known to be ±200m, and the expected average ranging errors of ranging scheme 2 and ranging scheme 3 can be approximately converted to ±300m and ±350m respectively. The optimization directions of the elements in this embodiment are all consistent, that is, the smaller the impact or the lower the dependence, the smaller the absolute value of the average ranging error of the ranging method.

[0131] Calculate the benefit evaluation score of each ranging scheme, and j1 and X j2 The efficiency indicators were standardized and the results are shown in Table 8 below.

[0132] Table 8 Standardized values ​​of benefit indicators

[0133] Social Benefits Power supply enterprise benefits The first distance measurement scheme: traveling wave method 1 0 The second distance measurement scheme: impedance method 0.334 1 The third ranging scheme: voltage gradient method 0 0.9984

[0134] According to the set benefit weights, the second ranging scheme has the best expected comprehensive benefit, the third ranging scheme is second, and the first ranging scheme is slightly worse. Therefore, it is recommended that power supply companies give priority to the application of the second ranging scheme.

[0135] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for evaluating a distribution line distance measurement scheme, characterized in that: include: Obtain N distance measurement schemes to be selected for the distribution line and the distribution line parameters; Establish an evaluation hierarchy of ranging schemes, and based on the established evaluation hierarchy, use the analytic hierarchy process to calculate the weight of each ranging scheme to the target layer, and calculate the average ranging error of the ranging schemes; According to the distribution line parameters and the average ranging error of each ranging scheme, the benefit evaluation score of each ranging scheme is calculated, and the ranging scheme corresponding to the highest benefit evaluation score is output as the final scheme.

2. The evaluation method for a distribution line distance measurement scheme according to claim 1, characterized in that: The distribution line parameters include the number of line sections, the number of load points in each section, the length of each section, the manual line inspection time and failure rate of each section when no distance measurement scheme is adopted, the size of each load point in each section, and the unit power outage loss and cost.

3. The evaluation method for a distribution line distance measurement scheme as claimed in claim 2, characterized in that: The evaluation hierarchy is composed of a target layer, a criterion layer and a scheme layer from top to bottom; the target layer is the average ranging error, the criterion layer includes A elements, and the scheme layer is N ranging schemes to be selected.

4. The evaluation method for a distribution line distance measurement scheme as claimed in claim 3, characterized in that: The analytic hierarchy process includes comparing each distance measurement scheme under each element in pairs to establish M scheme judgment matrices, and comparing each element in pairs to establish an element judgment matrix; When the dimension of the scheme judgment matrix or the factor judgment matrix is ​​greater than 2, the maximum eigenvalue of each scheme judgment matrix and the factor judgment matrix is ​​calculated, and a consistency check is performed on each scheme judgment matrix and the factor judgment matrix. If the consistency check passes, the next step is entered. If the consistency check fails, the scheme judgment matrix and the factor judgment matrix are re-established. Select the vector corresponding to the maximum eigenvalue of each scheme judgment matrix as the eigenvector, and normalize the eigenvector to obtain the weight corresponding to each scheme under each factor. Select the vector corresponding to the maximum eigenvalue of the factor judgment matrix as the eigenvector, and normalize the eigenvector to obtain the weight ω of each factor m '; According to the weight ω of each element m 'Perform a consistency check on the total hierarchical ordering. If the check passes, proceed to the next step. If the check fails, re-establish the scheme judgment matrix and factor judgment matrix; According to the weight of each plan under each factor and the weight of each factor ω m 'Calculate the weight ω of each ranging scheme for the target layer j , expressed as: in, It represents the weight of the jth solution under the mth factor.

5. The evaluation method for a distribution line distance measurement scheme as claimed in claim 4, characterized in that: The average ranging error of the ranging scheme includes the average ranging error δ of the i-th ranging scheme. i , calculate the average ranging error δ of the jth ranging scheme j , expressed as: Among them, δ i represents the absolute value of the average ranging error of the i-th ranging scheme; δ j represents the absolute value of the average ranging error of the jth ranging scheme; ω i Represents the weight of the i-th ranging scheme on the target layer.

6. The evaluation method for a distribution line distance measurement scheme according to claim 5, characterized in that: The benefit evaluation score includes calculating the power outage loss of power users reduced within a statistical period of one year after the power supply enterprise adopts each distance measurement scheme, which is recorded as the power outage loss reduced by the power user and is expressed as: Among them, ΔY j1 is the power outage loss reduced by power users after the power supply enterprise adopts the jth distance measurement scheme; x represents the number of sections; h a represents the number of load points in the ath section; l a represents the length of the ath segment; t a represents the manual line patrol time when the distance measurement scheme is not adopted in the ath section; f a represents the failure rate when the distance measurement scheme is not adopted in the ath section; Q ab represents the value of the bth load point in the ath section; y 1ab It represents the unit load power outage loss of the bth load point in the ath section; After the power supply enterprise adopts each distance measurement scheme, it is estimated that the loss of the power supply enterprise caused by power shortage during the statistical period of one year is reduced, which is recorded as the power outage loss reduced by the power supply enterprise and expressed as: Among them, ΔY j2 represents the power outage loss reduced after the power supply enterprise adopts the jth distance measurement scheme; y 2ab It represents the unit load benefit of the bth load point in the ath section; Calculate the annual cost of each distance measurement scheme adopted by the power supply enterprise, expressed as: Among them, C j represents the annual cost of the power supply enterprise adopting the jth distance measurement scheme; γ j is the discount rate of the equipment of the jth ranging solution; d j1 represents the number of traveling wave ranging terminals required for the jth ranging scheme; d j2 represents the number of common distribution terminals required for the jth ranging scheme; c j1 represents the cost of the traveling wave ranging terminal of the jth ranging scheme; c j2 represents the cost of the common distribution terminal of the jth ranging scheme; c j3 represents the cost of the GPRS channel of the jth ranging scheme; e j represents the age of the equipment of the jth ranging scheme; Remember ΔY j1 The social benefit X of the power supply company adopting the jth distance measurement scheme j1 , remember X j2 =ΔY j2 -C j is the benefit of the power supply enterprise adopting the jth distance measurement scheme, and the X of each distance measurement scheme is j1 and X j2 The efficiency indicators are standardized and the results are recorded as Z j1 and Z j2 ; Z j1 and Z j2 Assign weights α1 and α2 respectively, and calculate the benefit evaluation scores of each ranging scheme: z j =α1z j1 +α2z j2 Among them, z j Represents the benefit evaluation score of the jth ranging scheme.

7. The evaluation method for a distribution line distance measurement scheme according to claim 6, characterized in that: The standardization of the benefit index includes: j1 and X j2 Converted to a unified scale comparison, expressed as: Among them, z j Indicates the normalized index; maxX j The social benefit X of each ranging scheme is j The maximum value in minX j The social benefit X of each ranging scheme j The minimum value in .

8. An evaluation system for a distribution line distance measurement solution using the method according to any one of claims 1 to 7, characterized in that: include, A data acquisition module is used to obtain N distance measurement schemes to be selected for the distribution line and the distribution line parameters; An evaluation module establishes an evaluation hierarchy of the ranging scheme, and based on the established evaluation hierarchy, uses the hierarchical analysis method to calculate the weight of each ranging scheme to the target layer, and calculates the average ranging error of the ranging scheme; The scheme output module calculates the benefit evaluation score of each distance measurement scheme according to the distribution line parameters and the average distance measurement error of each distance measurement scheme, and outputs the distance measurement scheme corresponding to the highest benefit evaluation score as the final scheme.

9. A computing device comprising: Memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the method described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions, when executed by a processor, implement the steps of the method according to any one of claims 1 to 7.

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