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Power supply reliability fuzzy comprehensive evaluation method based on improved membership degree function

A technology of fuzzy comprehensive evaluation and membership function, which is applied in data processing applications, instruments, calculations, etc., can solve problems such as consistent evaluation results, and achieve the effect of solving the problems of consistent evaluation results that cannot be distinguished, and fine power supply reliability fuzzy comprehensive evaluation

Inactive Publication Date: 2017-05-10
国网江西省电力有限公司经济技术研究院 +1
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Problems solved by technology

[0006] Although the membership function model established in this paper quantifies the ambiguity between the indicators relative to each quality level, there is a problem that the evaluation results are consistent when the indicator data are similar.

Method used

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  • Power supply reliability fuzzy comprehensive evaluation method based on improved membership degree function
  • Power supply reliability fuzzy comprehensive evaluation method based on improved membership degree function
  • Power supply reliability fuzzy comprehensive evaluation method based on improved membership degree function

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Embodiment 1

[0072] In this embodiment, a fuzzy comprehensive evaluation method for power supply reliability based on an improved membership function includes the following steps:

[0073] Step S1, select N grass-roots indicators that can reflect the current situation of power supply reliability of the distribution network to establish an evaluation index system;

[0074] Step S2, dividing the quality grades of the N evaluation indicators into 6 quality grades, which are: "best", "excellent", "good", "medium", "qualified" and "unqualified";

[0075] Step S3, using the improved AHP combined with the variation coefficient method to determine the comprehensive weight of each evaluation index in the evaluation index system;

[0076] Specific steps are as follows:

[0077] Step S3.1, preprocessing the data corresponding to the evaluation index in the evaluation index system, removing the deformed data and using the average value method to fill in the missing data;

[0078] Step S3.2, use the ...

Embodiment 2

[0120] In this embodiment, a fuzzy comprehensive evaluation method for power supply reliability based on an improved membership function includes the following steps:

[0121] First, determine the distribution network power supply reliability evaluation index system, as shown in Table 1

[0122] Table 1 Power supply reliability index of distribution network

[0123]

[0124] Then divide the quality level of the indicators, as shown in Table 2

[0125] Table 2 Power supply reliability evaluation index and its quality level

[0126]

[0127]Afterwards, the comprehensive weight of each indicator is obtained, and the subjective weight is obtained by using the improved analytic hierarchy process to calculate the weight of each indicator. First, a judgment matrix needs to be constructed. Generally, the 0.1-0.9 scaling method is used to construct the original judgment matrix.

[0128] Table 3 Meaning of scale value 0.1-0.9

[0129]

[0130]

[0131] Judgment matrix A=(...

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Abstract

The invention discloses a power supply reliability fuzzy comprehensive evaluation method based on an improved membership degree function. The method comprises the following steps: (1) selecting N basic level indexes capable of reflecting a current situation of a power supply reliability of a power distribution network to establish an evaluation index system; (2) dividing quality grades of N evaluation indexes into six quality grades, which respectively are "optimal", "excellent", "good", "mean", "qualified" and "unqualified"; (3) determining a comprehensive weight for each of the evaluation indexes in the evaluation index system by employing subjective and objective analysis methods which combine an improved hierarchical analysis method with a variation coefficient method; and (4) carrying out scoring on each evaluation index to obtain a scoring value of the each evaluation index. According to the method disclosed by the invention, the problem that a relation is established difficultly between two quality grades of the evaluation indexes in power supply reliability fuzzy comprehensive evaluation field is solved; and meanwhile, the problem that when index data are similar, evaluation results are consistent and cannot be distinguished is solved, and more fine power supply reliability fuzzy comprehensive evaluation is realized.

Description

technical field [0001] The invention relates to a fuzzy comprehensive evaluation method for power supply reliability based on an improved membership function, and belongs to the technical field of power supply reliability evaluation. Background technique [0002] Because there is fuzziness between every two quality levels of power supply reliability index, fuzzy theory is widely used in power supply reliability evaluation. A key point of applying fuzzy evaluation to the evaluation of power supply reliability is to construct the membership function. However, the common defect of various membership functions in dealing with fuzzy concepts is that they do not quantify the fuzzy characteristics of each evaluation index relative to each quality level in detail, and only calculate The degree of membership of the index relative to the qualified range; even if the ambiguity between the quality levels of each index is quantified, there is still the problem that the evaluation results...

Claims

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Application Information

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IPC IPC(8): G06Q50/06
CPCG06Q50/06
Inventor 杨为群朱文广程虹王丽彭怀德肖园罗路平杨超王敏
Owner 国网江西省电力有限公司经济技术研究院
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