Power transmission line galloping grading early warning method and system

Abstract

The invention discloses a power transmission line galloping grading early warning method and system. The method comprises the steps of establishing a recursive hierarchical structure according to a logic sequence of influences of the indexes on galloping; constructing the judgment matrixes of different levels according to the recursive hierarchical structure and the importance between the indexes; performing the consistency inspection, calculating an index combination weight vector by adopting an analytic hierarchy process; carrying out grey class division and normalization processing on the indexes according to different waving states, determining different grey class threshold parameters according to each normalized index value, calculating the corresponding whitening weight function values according to different grey classes, calculating a comprehensive clustering coefficient matrix according to the whitening weight function values and weight vector values, and determining the corresponding waving state according to the maximum membership degree. A according to the power transmission line galloping grading early warning method and system, the hierarchical analysis is adopted for the index system construction, the galloping state judgment and the early warning are considered in a layered mode according to the logic sequence, an analytic hierarchy process is adopted for comparing every two indexes of the same level and mutual influence between different levels through mathematical calculation index quantity weight, and the accuracy is high.

Description

technical field

[0001] The present invention relates to disaster prevention and control of electric power systems, and more specifically, to a method and system for early warning of galloping in transmission lines. Background technique

[0002] The low-frequency, large-amplitude self-excited vibration phenomenon of overhead conductors with uneven ice coating along the circumferential direction under the action of lateral wind. When the wire dances, one, two or three antinode standing waves or traveling waves will be formed in a wire. The wire mainly moves vertically, sometimes in an elliptical motion. The long axis of the ellipse is in the vertical direction or deviates from the vertical direction. Sometimes it is accompanied by twisting of the wire. The frequency of vertical vibration is about 0.1-1Hz, and the amplitude is between tens of centimeters and several meters. Serious conductor galloping is an antinode vibration in the long-gauge conductor, and the suspension in...

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