Substation sag sensitivity grading method based on subordinate user industrial features

Abstract

A substation sag sensitivity grading method based on subordinate user industrial features comprises the first step of determining industry types involved in subordinate users of all substations in a region to be analyzed and setting sensitivity coefficients of all industries, the second step of inputting basic data, namely load ratios of the industries of the subordinate users, of the substations in a power grid in the region to be analyzed, the third step of applying the fuzzy C-means (FCM) algorithm to cluster the substations and outputting a clustering result according to analysis requirements after the number of categories is determined, the fourth step of taking the clustering center of each category of substations as a reference and calculating sag sensitivity of various categories of the substations in the combination of the sensitivity coefficients of the industries, and the fifth step of dividing the substations in the power grid in the region into corresponding grades by the sequence obtained according to the magnitude of the sensitivity. According to the substation sag sensitivity grading method based on the subordinate user industrial features, the sag sensitivity can be analyzed on the level of the substations, the workload is few and is geared to practical situations, and the sag sensitivity of the substations is comprehensively reflected through load diversities.

Description

technical field [0001] The invention relates to a substation sag sensitivity grading method based on the industry characteristics of subordinate users. Background technique [0002] The sag sensitivity of a substation refers to the sensitivity of all the loads under the substation to the voltage sag problem, that is, the ability of its subordinate loads to withstand interference and still work normally when the substation is subjected to voltage sags. The lower the ability, the lower the sensitivity. Also higher. [0003] In recent years, with the development of science and technology, the wide application of sensitive power electronic equipment, and the emergence of new power-sensitive loads such as semiconductor manufacturing and computer integrated manufacturing, higher requirements have been placed on the power quality of power supply, which makes voltage temporary The power drop problem has received extensive attention, and it has gradually become one of the power qual...

AI Technical Summary

Problems solved by technology

[0006] At present, most of the analysis methods for the sensitivity of voltage sags are only to evaluate the sensitivity of voltage sags of a single electrical equipment, but there is no clear method for analyzing the overall sensitivity of substation loads.

To analyze the overall sensitivity of lower-level loads from the substation level, we mainly face the following three problems, which are also the key problems in the practical application of substation sag sensitivity classification: 1) The substation sag sensitivity depends on the overall characteristics of the lower-level users, which is difficult Use the current sensitivity assessment method for a single electrical equipment to analyze at the substation level; 2) There are a large number of substations, and the geographical distribution of sub-users in each substation is very wide. The sensitivity to sags will lead to a huge and impractical workload; 3) Different electrical equipment used by users has huge differences in sensitivity to voltage sags, and the diversity of loads leads to different substation sub-user industries. The characteristics are different, how to comprehensively reflect the sag sensitivity of the substation from the sensitive characteristics of the subordinate users is still no theoretical method

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