Transformer fuzzy comprehensive evaluation method based on variable weight

Abstract

The invention provides a transformer fuzzy comprehensive evaluation method based on a variable weight. The method includes following steps: collecting state data according to a pre-established transformer state comprehensive evaluation index system, and performing dimensionless standardization processing on evaluation indexes; determining a constant weight by employing an analytic hierarchy process, and performing variable weight processing on a constant weight vector with the combination of an evaluation index set obtained after standardization processing; establishing a power transformer state grade remark set; determining a fuzzy comprehensive evaluation matrix according to the membership degree of the bottom layer in a membership function calculating evaluation model for the state grade, calculating an evaluation result, and obtaining the overall state of the transformer by employing a fuzzy comprehensive evaluation operator; and obtaining the membership degree of each state for the fuzzy comprehensive evaluation, and determining the operation state grade of the transformer by employing a maximum membership degree principle. According to the method, the change of the weight value of the quantity of state is realized according to the practical state index so that the influence of the quantity of state with large deterioration degree on an evaluation target is increased, and the state evaluation is more reasonable.

Description

technical field [0001] The invention relates to the technical field of equipment comprehensive evaluation, in particular to a transformer fuzzy comprehensive evaluation method based on variable weight. Background technique [0002] Large-scale power transformers are the hub of electric power grid transmission, and their safety and reliability are the necessary conditions to ensure the reliable operation of the power system. With the continuous increase of the power system scale and transformer capacity, the losses caused by its failure to the national economy are also increasing. Big. [0003] Transformer condition evaluation is an important basis for decision-making of condition-based maintenance, which determines the items and content of equipment condition-based maintenance, and directly affects the quality and effect of transformer condition-based maintenance. The state evaluation of power transformer involves many state quantities, and the change of each state quantity...

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Problems solved by technology

[0005] At present, there are few studies on the determination method of the index weight in the transformer state evaluation, and the constant weight evaluation model is mainly used, which leads to the inability to reflect the impact of the deterioration of the small weight value state quantity on the evaluation target, which makes the distribution of the weight coefficient unreasonable

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