Method and system for comprehensively evaluating state index empowerment of low-voltage distribution area

Abstract

The invention relates to the technical field of low-voltage distribution areas, in particular to a low-voltage distribution area state index weighting comprehensive evaluation method and system, and the method comprises the steps: constructing a low-voltage distribution area state comprehensive evaluation index system; standardization processing is carried out on each index result value, and a Delphi method is adopted to design a standard score conversion rule of the index value at the bottommost layer; the subjective and objective weights are synthesized through a Lagrange multiplier method, and the comprehensive weight of each index is obtained; and obtaining a comprehensive score of the state of the low-voltage distribution area by adopting weighted calculation. The method has the beneficial effects that the subjectivity of the analytic hierarchy process can be reduced by fusing the comprehensive index weighting method of the anti-entropy weight method, and meanwhile, the objectivity and accuracy of evaluation are improved by reflecting the fluctuation of the weight through data change. The anti-entropy weight method serves as an objective weighting method, can reflect information content characteristics provided by data, and can reduce the limitation of a single method when being used in combination with the analytic hierarchy process.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage distribution substations, and in particular to a method and system for weighted comprehensive evaluation of state indicators of low-voltage distribution substations. Background Art

[0002] At present, when power grid companies conduct low-voltage distribution station status assessment, there are still relatively simple evaluation indicators, and the evaluation methods are either too subjective or too objective. The application of business system data in the low-voltage distribution station status assessment is not in-depth enough. As a result, the company's assessment of the status of the low-voltage distribution station area is still relatively one-sided, which affects the overall result of the station status evaluation. It is often "seeing the leopard from the small spots", which also directly leads to unsatisfactory results in daily operation monitoring, station transformation, station governance and other work in the station area, and even greatly deviates from expectations. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

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

[0005] Therefore, the present invention provides a method and system for weighted comprehensive evaluation of low-voltage distribution station status indicators, which can solve the problems mentioned in the background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, the present invention provides a method for weighted comprehensive evaluation of low-voltage distribution station area status indicators, including constructing a comprehensive evaluation indicator system for low-voltage distribution station area status;

[0008] Standardize the result values ​​of each indicator, and use the Delphi method to design the standard score conversion rules for the lowest-level indicator values;

[0009] The Lagrange multiplier method is used to combine subjective and objective weights to obtain the comprehensive weight of each indicator;

[0010] A weighted calculation is used to obtain a comprehensive score for the status of the low-voltage distribution station area.

[0011] As a preferred solution of the method for weighted comprehensive evaluation of low-voltage distribution station area status indicators of the present invention, the comprehensive weight includes a weighted average of a subjective weight and an objective weight.

[0012] As a preferred solution of the method for weighted comprehensive evaluation of low-voltage distribution station area status indicators of the present invention, wherein: the subjective and objective weights are integrated by Lagrange multiplier method, including:

[0013] The analytic hierarchy process was used to determine the subjective weights of the indicators;

[0014] The anti-entropy weight method is used to determine the objective weight of the indicator.

[0015] As a preferred solution of the method for weighted comprehensive evaluation of low-voltage distribution station area status indicators of the present invention, the standardization process includes converting the indicator result value into a percentage score.

[0016] As a preferred solution of the method for weighted comprehensive evaluation of low-voltage distribution station area status indicators of the present invention, the subjective weight is determined by constructing a judgment matrix and calculating the relative importance of each indicator.

[0017] As a preferred solution of the method for weighted comprehensive evaluation of low-voltage distribution station area status indicators of the present invention, objective weight determination is to allocate weights based on the variability of indicator data.

[0018] As a preferred solution of the method for weighted comprehensive evaluation of low-voltage distribution station status indicators of the present invention, the comprehensive evaluation indicator system includes primary indicators and secondary indicators, wherein the secondary indicators are specific evaluation indicators further subdivided according to the primary indicators.

[0019] In a second aspect, the present invention provides a system for weighted comprehensive evaluation of low-voltage distribution station area status indicators, including: a standard module: used to construct a comprehensive evaluation indicator system for low-voltage distribution station area status;

[0020] Processing module: used to standardize the result values ​​of each indicator, and use the Delphi method to design the standard score conversion rules for the lowest level indicator values;

[0021] The first calculation module: used to combine subjective and objective weights through the Lagrange multiplier method to obtain the comprehensive weight of each indicator;

[0022] The second calculation module: is used to obtain the comprehensive score of the low-voltage distribution station area status by weighted calculation.

[0023] In a third aspect, the present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0024] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of the above method when the computer program is executed by a processor.

[0025] Compared with the prior art, the present invention has the following beneficial effects: the comprehensive weighting method of indicators combined with the anti-entropy weight method can reduce the subjectivity of the analytic hierarchy process, and at the same time, use data changes to reflect the fluctuation of weights, thereby increasing the objectivity and accuracy of the evaluation. As an objective weighting method, the anti-entropy weight method can reflect the information characteristics provided by the data itself, and when used in combination with the analytic hierarchy process, it can reduce the limitations of a single method. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0027] Figure 1 Flow chart of the method for weighting comprehensive evaluation of low-voltage distribution station area status indicators.

[0028] Figure 2 This is a schematic diagram of the comprehensive evaluation index system for the low-voltage distribution station status.

[0029] Figure 3 A schematic diagram of the internal structure of a computer device. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, 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 accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example 1

[0034] Reference Figure 1-2 , which is the first embodiment of the present invention, and provides a method for weighted comprehensive evaluation of low-voltage distribution station area status indicators, which includes:

[0035] S1. Construct a comprehensive evaluation index system for the status of low-voltage distribution station areas.

[0036] Furthermore, the comprehensive evaluation index system includes primary indicators and secondary indicators, wherein the secondary indicators are specific evaluation indicators that are further subdivided based on the primary indicators.

[0037] Reference Figure 2 Through the integrated application of Delphi method and hierarchical analysis method, relying on the current power supply enterprises' distribution network automation, metering automation system data scope, data generation frequency and the actual needs of substation management and substation transformation business, considering the monthly evaluation unit, from the overall situation of the substation, line loss, voltage quality, load conditions, power outages, power factors, data collection quality and other 7 dimensions, the low-voltage distribution substation status comprehensive evaluation indicators are sorted out and designed, the entire indicator is divided into two hierarchical structures, 7 first-level indicators and 12 second-level indicators are set, and the first-level indicators are used as summary indicators.

[0038] S2. Standardize the result values ​​of each indicator and use the Delphi method to design the standard score conversion rules for the lowest level indicator values.

[0039] It should be noted that after outputting the comprehensive evaluation index system for the status of low-voltage distribution stations, combined with the calculation rules of the indicators, the indicator result values, i.e., "raw data", will be obtained. However, because the units of the result values ​​of each indicator are not unified, and for the convenience of calculation, the standardization of the "raw data" of the result values ​​of each indicator will be completed first.

[0040] Furthermore, the standardization process includes converting the indicator result values ​​into percentage scores.

[0041] It should be noted that when standardizing the indicator result values, the Delphi method is used. Based on the grid guidance documents, the actual situation of the substation, historical data and the importance of the indicators, the standard score conversion rules for the lowest-level indicator values ​​are designed in the form of score conversion. The scores are set according to the percentage system. The conversion rules are shown in the following table:

[0042] Table 1 Example of conversion rules for comprehensive evaluation index standards of low-voltage distribution station status

[0043]

[0044]

[0045] It should be further explained that, in this indicator system, since the upper-level indicators are mainly obtained through the aggregation and calculation of lower-level indicators, the standard score conversion rules for indicator values ​​will only be set for the lowest-level indicators. After the standard scores of the lowest-level indicators are calculated, the corresponding upper-level indicator scores can be obtained through weighted calculation.

[0046] S3. The subjective and objective weights are integrated through the Lagrange multiplier method to obtain the comprehensive weight of each indicator.

[0047] Furthermore, the subjective and objective weights are integrated through the Lagrange multiplier method, including:

[0048] The analytic hierarchy process is used to determine the subjective weights of the indicators.

[0049] Furthermore, the subjective weights are determined by constructing a judgment matrix and calculating the relative importance of each indicator.

[0050] It should be noted that the use of AHP to determine the subjective weights of indicators includes the construction of the evaluation indicator judgment matrix, the calculation of the weights of each indicator, and the consistency check of the judgment matrix.

[0051] It should be further explained that the construction of the evaluation index judgment matrix is ​​based on the hierarchical structure of the index, combined with the Delphi method, and the corresponding field experts in the enterprise are selected. According to the 9-point evaluation standard of the hierarchical analysis method, the relative importance of each index is evaluated by comparing the indicators two by two. After the evaluation results are output, the corresponding two-dimensional judgment matrix A is constructed.

[0052] A=(a ij ) m×m (i=1,2,...,m; j=1,2,...,m) (1)

[0053] In the formula, a ij is the relative importance of each indicator, and m is the number of indicators.

[0054] The weight calculation of each indicator is based on the row, and the square root method is used to complete the calculation of the geometric mean of each row of the judgment matrix A.

[0055]

[0056] The row vectors in the judgment matrix A are normalized to obtain the weight of each indicator and the subjective weight set W corresponding to the comprehensive evaluation index of the low-voltage distribution station area is obtained.

[0057]

[0058] W=(w1,w2,...,w m ) (i=1,2,...,m) (4)

[0059] In the formula, w i is the weight corresponding to each indicator.

[0060] The consistency check of the judgment matrix is ​​performed by calculating the maximum eigenvalue λ of the judgment matrix. max, calculate the consistency index CI of the judgment matrix, and after calculating the random consistency ratio CR of the judgment matrix, if CR≤0.1, it is considered that the consistency of the judgment matrix has passed the check, otherwise the judgment matrix needs to be adjusted.

[0061]

[0062] RI is the random consistency index. The judgment criteria are shown in the table below. The order in the table corresponds to the number of indicators.

[0063] Table 2 Average random consistency index judgment criteria

[0064] Degree 1 2 3 4 5 6 7 8 9 10 11 12 13 14 RI value 0 0 0.52 0.89 1.12 1.24 1.36 1.41 1.46 1.49 1.52 1.54 1.56 1.58

[0065] The anti-entropy weight method is used to determine the objective weight of the indicator.

[0066] Furthermore, objective weight determination is to assign weights based on the variability of indicator data.

[0067] It should be noted that the use of the anti-entropy weight method to determine the objective weight of indicators includes constructing an evaluation indicator matrix, calculating the anti-entropy of each indicator, and determining the objective weight of the indicator.

[0068] It should be further explained that the construction of the evaluation index matrix includes assuming that there are m evaluation indicators at the same level of the comprehensive evaluation index of the low-voltage distribution station status, n evaluation objects, that is, n stations to be evaluated, and the evaluation matrix N is constructed as follows:

[0069] N=(b jk ) m×n (j=1,2,...,m; k=1,2,...,n) (8)

[0070] Where bjk is the corresponding evaluation index value of each evaluation object.

[0071] The anti-entropy calculation of each indicator is to calculate the anti-entropy value corresponding to each evaluation value for the evaluation indicator value in the evaluation indicator matrix.

[0072]

[0073] To determine the objective weight of the indicator, after completing the calculation of the anti-entropy value of each indicator, the anti-entropy value of each indicator is normalized to obtain the anti-entropy weight u, that is, the objective weight of the indicator, and the subjective weight set U corresponding to the comprehensive evaluation index of the low-voltage distribution station area is obtained.

[0074]

[0075] U=(u1,u2,...,u m ) (i=1,2,...,m) (11)

[0076] Furthermore, the comprehensive weight includes a weighted average of the subjective weight and the objective weight.

[0077] It should be noted that after the subjective weight w and the objective weight u are calculated, the Lagrange multiplier method is used to complete the calculation of the subjective and objective comprehensive weights to obtain the indicator comprehensive weight set W'.

[0078]

[0079] W'=(w'1,w'2,...,w' m ) (13)

[0080] S4. Use weighted calculation to obtain a comprehensive score for the status of the low-voltage distribution station area.

[0081] It should be noted that after the weights of each indicator are determined, the weighted calculation can be used to quickly calculate the weighted score S of the indicator:

[0082]

[0083] In the formula, S is the total score of the table, S i is the score of each index of the ith type, W i is the comprehensive weight of each indicator.

[0084] In summary, the beneficial effect of the method for weighted comprehensive evaluation of low-voltage distribution station status indicators of the present invention is that the comprehensive weighting method of indicators that integrates the anti-entropy weight method can reduce the subjectivity of the hierarchical analysis method, and at the same time use data changes to reflect the fluctuation of weights, thereby increasing the objectivity and accuracy of the evaluation. As an objective weighting method, the anti-entropy weight method can reflect the information characteristics provided by the data itself, and can be used in combination with the hierarchical analysis method to reduce the limitations of a single method.

[0085] Example 2

[0086] This embodiment provides a system for weighted comprehensive evaluation of low-voltage distribution station area status indicators, which includes a standard module: for constructing a comprehensive evaluation indicator system for low-voltage distribution station area status;

[0087] Processing module: used to standardize the result values ​​of each indicator, and use the Delphi method to design the standard score conversion rules for the lowest level indicator values;

[0088] The first calculation module: used to combine subjective and objective weights through the Lagrange multiplier method to obtain the comprehensive weight of each indicator;

[0089] The second calculation module: is used to obtain the comprehensive score of the low-voltage distribution station area status by weighted calculation.

[0090] The above-mentioned unit modules may be embedded in or independent of a processor in a computer device in the form of hardware, or may be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to the above-mentioned modules.

[0091] Example 3

[0092] This embodiment provides a computer device, which may be a terminal, and its internal structure diagram may be as follows: Figure 3 As shown. The computer device includes a processor, a memory, a communication interface, a display screen and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for weighted comprehensive evaluation of low-voltage distribution station area status indicators is implemented. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device housing, or an external keyboard, touchpad or mouse, etc.

[0093] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, it implements: constructing a comprehensive evaluation index system for the status of a low-voltage distribution station area; standardizing the result value of each indicator, and using the Delphi method to design a standard score conversion rule for the lowest-level indicator value; using the Lagrange multiplier method to integrate subjective and objective weights to obtain a comprehensive weight of each indicator; and using weighted calculation to obtain a comprehensive score for the status of a low-voltage distribution station area.

[0094] 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 can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A method for weighted comprehensive evaluation of low-voltage distribution station area status indicators, characterized in that: include, Construct a comprehensive evaluation index system for the status of low-voltage distribution substations; Standardize the result values ​​of each indicator, and use the Delphi method to design the standard score conversion rules for the lowest level indicator values; The Lagrange multiplier method is used to combine subjective and objective weights to obtain the comprehensive weight of each indicator; A weighted calculation is used to obtain a comprehensive score for the status of the low-voltage distribution station area.

2. The method for weighted comprehensive evaluation of low-voltage distribution station area status indicators as claimed in claim 1 is characterized by: The comprehensive weight includes the weighted average of the subjective weight and the objective weight.

3. The method for weighted comprehensive evaluation of low-voltage distribution station area status indicators as claimed in claim 2 is characterized by: The Lagrange multiplier method is used to combine subjective and objective weights. include, The analytic hierarchy process was used to determine the subjective weights of the indicators; The anti-entropy weight method is used to determine the objective weight of the indicator.

4. The method for weighted comprehensive evaluation of low-voltage distribution station area status indicators as claimed in claim 3 is characterized by: The standardization process includes converting the indicator result value into a percentage score.

5. The method for weighted comprehensive evaluation of low-voltage distribution station area status indicators as claimed in claim 4 is characterized by: The subjective weight is determined by constructing a judgment matrix and calculating the relative importance of each indicator.

6. The method for weighted comprehensive evaluation of low-voltage distribution station area status indicators as claimed in claim 5, characterized in that: The objective weight determination is to assign weights based on the variability of the indicator data.

7. The method for weighted comprehensive evaluation of low-voltage distribution station area status indicators according to any one of claims 1 to 6, characterized in that: The comprehensive evaluation index system includes primary indicators and secondary indicators, wherein the secondary indicators are specific evaluation indicators further subdivided according to the primary indicators.

8. A system for weighted comprehensive evaluation of low-voltage distribution station area status indicators, characterized in that: include: Standard module: used to construct a comprehensive evaluation index system for the status of low-voltage distribution substations; Processing module: used to standardize the result values ​​of each indicator, and use the Delphi method to design the standard score conversion rules for the lowest level indicator values; The first calculation module: used to combine subjective and objective weights through the Lagrange multiplier method to obtain the comprehensive weight of each indicator; The second calculation module: is used to obtain the comprehensive score of the low-voltage distribution station area status by weighted calculation.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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