Power equipment evaluation method based on discrete fuzzy number and analytic hierarchy process

Abstract

The invention provides a power equipment evaluation method based on a discrete fuzzy number and an analytic hierarchy process; the method includes constructing a multi-level analytic hierarchy model through the transformer evaluation indexes, sequentially assigning values to the weights of the indexes of all levels through expert evaluation, and constructing an index weight vector through the bottommost transformer evaluation index; dividing the power equipment index actual measurement data into benefit type data and cost type data for standardized processing according to the dimension difference among the state variables of the transformer and the situation that the state variables cannot be directly compared due to different polarities, and obtaining dimensionless data; and describing the state of the transformer by adopting a multi-level fuzzy language, mapping dimensionless data to a membership degree space through a fuzzy matrix, and determining the state of the power equipment through a membership degree principle in combination with an index weight vector, thereby realizing evaluation of the power equipment. According to the invention, the randomness and fuzziness of the power equipment evaluation indexes can be considered, the problems of artificial subjective influence and sample data depletion in equipment state evaluation are reduced to a certain extent, and the evaluation reliability is high.

Description

technical field [0001] The invention belongs to the technical field of transformer fault evaluation and maintenance, and in particular relates to a power equipment evaluation method based on discrete fuzzy numbers and analytic hierarchy process. Background technique [0002] As an important part of the smart grid, the smart substation has the characteristics of information digitization, standardization, and resource network sharing. It can help the grid realize the integration and intelligence of power generation and transformation, power transmission and distribution, and business information sharing, and realize efficient collaborative interaction. Among them, the transformer, as the core equipment in the power transmission and transformation system, shoulders the important responsibility for the safe operation of the power grid. However, considering various environmental factors and the influence of internal materials, it is usually inevitable that transformers will fail ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to provide a power equipment evaluation method based on discrete fuzzy numbers and analytic hierarchy process, which takes into account the fuzziness and randomness of power evaluation indicators, and solves the problem of poor sample data to a certain extent. Transformer status assessment provides a new solution and provides scientific and reasonable guidance for subsequent maintenance work

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