High-voltage transmission line swing identification method based on video image self-discrimination

Abstract

The power transmission line swing video shot on the spot is analyzed, in order to extract the swing information, the equipment spacer with the landmark on the power transmission line is selected as a target object for judging the swing information, and the improved Harris corner detection method is provided to achieve automatic judgment of the spacer. The improvement focuses on dynamic adjustment of a corner detection critical value and elimination of wrongly detected corners, so that the improved method automatically discriminates all the spacers in the graph; and spectral analysis and trigonometric function fitting are performed on the obtained time queue of the spacer swing coordinates to obtain the swing frequency and amplitude of the power transmission line. The method of the invention is simpler and easier to implement, the precision meets the requirement, the efficiency is high, the method is applied to video monitoring and image processing of the power transmission line, the basic swing information can be quickly obtained in real time, and data support is provided for the design of a follow-up power transmission line swing early warning system and swing prevention measures.

Description

technical field [0001] The present application relates to a video high-voltage transmission line swing identification method, in particular to a video image self-identification high-voltage transmission line swing identification method, which belongs to the technical field of transmission line swing identification. Background technique [0002] High-voltage transmission lines are often exposed in the wild, the environment is harsh, and there is a lack of human supervision. During operation, accidents are prone to occur due to certain natural conditions and human factors. ice etc. The icing of transmission lines will lead to accidents such as disconnection of overhead conductors and interruption of power transmission. Ice-covered conductors are more likely to cause transmission line swings, and transmission line swings will cause serious accidents such as damage to hardware, collapse of towers, and even power grid failure. The safe operation of the power system is extremely ...

AI Technical Summary

Problems solved by technology

[0012] First, high-voltage transmission lines are prone to icing and swinging under harsh weather conditions, which may lead to serious accidents such as hardware damage, phase-to-phase short circuit, wire breakage, and transmission tower collapse. Due to the small strain and large displacement of the transmission line, its nonlinear characteristics Obvious and the dynamic characteristics are very complex. The existing technology cannot fully reveal the mechanism and dynamic characteristics of the oscillation. The technical transmission line swing identification method is complex and difficult to implement, the accuracy cannot meet the requirements and the efficiency is low, and the basic information of swing cannot be obtained quickly in real time, which hinders the design of the subsequent early warning system for transmission line swing, and cannot provide data support for swing prevention measures;

[0013] Second, the existing technology lacks clear rules for selecting iconic equipment on transmission lines as targets for judging swing information, lacks relevant ideas for analyzing transmission line swing monitoring videos, lacks comparative analysis to formulate video shooting methods and conditions, and does not have a set of It is clear and appropriate to meet the transmission line swing video acquisition standards with clear imaging, appropriate angle, reasonable shooting time, simple background, and obvious reference objects. Due to the lack of reliable transmission line swing video acquisition standards, the quality of the collected power line video is uneven. The lack of authoritative technical guidance has brought great obstacles to the standardization of the follow-up transmission line swing monitoring video;

[0014] Third, the existing technology lacks an efficient video conversion pre-processing method that improves image quality and reduces the amount of computation. The Harris corner detection method in the prior art cannot realize automatic discrimination of spacers, and cannot dynamically adjust corner detection thresholds and Excluding the wrongly detected corner points, it is impossible to automatically distinguish all the spacers in the picture, and the frequency spectrum analysis and trigonometric function fitting of the time queue of the spacer swing coordinates obtained later will cause major obstacles, and the frequency of the transmission line swing cannot be accurately obtained and amplitude, the high-voltage transmission line swing recognition accuracy is low and the efficiency is low

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