Distribution network equipment state evaluation method based on AHP-fuzzy comprehensive evaluation method

Abstract

The invention discloses a distribution network equipment state evaluation method based on an AHP-fuzzy comprehensive evaluation method. The method specifically comprises the following steps: step 1, screening distribution network equipment; step 2, establishing corresponding second-level and third-level evaluation index sets based on the distribution network equipment screened in the step 1; 3, determining a comprehensive first-level index for state evaluation of the distribution network equipment group; step 4, calculating second-level and third-level index weights; 5, determining a state evaluation index of the distribution network equipment; step 6, determining a comment set of the third-level indexes; step 7, establishing a third-level index fuzzy membership degree matrix under each second-level index; 8, determining a membership degree vector of each secondary index; and step 9, synthesizing an evaluation result vector of fuzzy comprehensive evaluation. According to the method, main equipment screening is carried out on the distribution network equipment according to actually available distribution network data and service requirements, and state evaluation is carried out on the main distribution network equipment by using an AHP fuzzy comprehensive evaluation method.

Description

technical field [0001] The invention belongs to the technical field of status evaluation of distribution network equipment, and relates to a distribution network equipment status evaluation method based on an AHP-fuzzy comprehensive evaluation method. Background technique [0002] The distribution network refers to the power network that receives electric energy from the transmission network or regional power plants and distributes it to various users locally or step by step through power distribution facilities. It is the last link in the process of electric energy transmission that directly faces users. The main electrical equipment in the distribution network includes distribution transformers, overhead lines, switching equipment, frame capacitors and other equipment. During the operation of power distribution equipment, equipment failures will inevitably occur due to various factors such as operating years, load overload, unbalanced power supply, aging defects, and bad w...

AI Technical Summary

Problems solved by technology

[0003] Among the commonly used state evaluation methods for distribution network equipment, the AHP relies on expert experience and has many qualitative components, the subjective factors account for a large proportion, the objectivity is relatively poor, and the hierarchy span is large, and the links between the layers are not close enough; the entropy weight method is too high. More rely on the features extracted from the equipment operation data to determine the weight, which cannot be closely connected with the actual situation, reducing the subjective and deterministic factors in the evaluation process

The above evaluation methods consider that the evaluation indicators are independent of each other during the evaluation, and it is easy to generate large deviations when calculating the weight of the indicators, which makes the evaluation results lack of comprehensiveness and affects the objectivity and accuracy of the status evaluation of distribution network equipment.

Images