A method for adaptability evaluation and decision-making of distribution network fault line selection

Abstract

The invention discloses a decision-making method for adaptability evaluation of distribution network fault line selection, which comprises step 1 establishing various influence factors for distribution network fault line selection modes; step 2 measuring the influence factors under different dimensions According to different line selection methods, a unified positive evaluation index is formed; in step 3, the evaluation index of each line selection method is normalized, the maximum value of the index constitutes an ideal sample, and the minimum value of the index constitutes a negative ideal sample; Step 4 makes an evaluation decision based on the ranking of line selection indicators; it solves the problem that when selecting lines for distribution network faults, factors such as distribution network structure, outgoing line type, and load conditions will have different degrees of influence on different line selection methods; At present, there is a lack of research on the comprehensive evaluation of line selection methods. It is impossible to select the most optimal line method for the specific structure of the distribution network, and it is impossible to ensure the accurate selection of fault lines, which threatens the safe and reliable operation of the distribution network and other technical problems.

Description

technical field [0001] The invention belongs to the technical field of power system analysis, and in particular relates to a method for evaluating the adaptability of fault line selection in a distribution network. Background technique [0002] With the further development of the domestic power distribution system, the structure of the power distribution network is becoming more and more complex. It is characterized in that the number of 10kV busbars in the power distribution network is gradually increasing, the distribution of fault zero-sequence current is becoming more and more complex, and there are many types of faults. When a fault occurs, the line selection method that can quickly and accurately select the faulty line is an important guarantee for the safe and reliable operation of the distribution network. [0003] At present, the commonly used line selection methods in distribution network include: zero-sequence current amplitude comparison method, zero-sequence cur...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an adaptability evaluation and decision-making method for distribution network fault line selection, so as to solve the problem of the distribution network structure of the actual small current grounding system when the prior art is aimed at distribution network fault line selection. Factors such as type of outgoing line, load condition and other factors will have different degrees of influence on different line selection methods; due to the lack of research on comprehensive evaluation of line selection methods, it is impossible to select the most optimal line method for the specific structure of the distribution network, and it is impossible to Ensure accurate selection of faulty lines, which threatens the safe and reliable operation of the distribution network and other technical issues

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