Cross-high-speed rail power transmission line multi-dimensional meteorological environment flutter falling risk assessment method

Abstract

The invention relates to the technical field of power grid disaster prevention and reduction, in particular to a cross-high-speed rail power transmission line multi-dimensional meteorological environment flutter falling risk assessment method, which comprises the following steps: S1, obtaining a basic random variable of a flutter falling response amount; s2, establishing a flutter falling risk assessment importance measure index system; s3, determining a general evaluation standard, and analyzing a basic variable importance measurement index; s4, calculating a specific basic random variable importance measurement index; s5, evaluating the influence degree of multi-factor random variables such as the chattering working condition, the multi-dimensional meteorological environment and the existence or absence of high-speed rails on the electric field and flow field disturbance of the cross-high-speed rail power transmission line; s6, correcting and updating importance measurement indexes; and S7, carrying out real-time flutter falling risk assessment on the cross-high-speed rail power transmission line. According to the cross-high-speed rail power transmission line flutter falling risk assessment method, in cross-high-speed rail power transmission line flutter falling risk assessment, a multi-dimensional meteorological environment variable factor is introduced, the importance measure of each index in a risk system is updated in real time in combination with an importance measure analysis method, and an obtained assessment result is more practical.

Description

technical field [0001] The invention belongs to the technical field of power grid disaster prevention and mitigation, and specifically refers to a method for assessing the risk of tremor shedding in a multi-dimensional meteorological environment across a high-speed railway transmission line. Background technique [0002] In recent years, with the strong support of the State Council's approval of the "Medium and Long-Term Railway Network Planning" development program, my country's high-speed railway has developed rapidly. At the same time, the intersection of overhead transmission lines and high-speed railways in the power grid has increased significantly. The high-speed rail passing through the adjacent area of ​​overhead transmission lines will directly threaten the safety of transmission lines and power system operation. The long-term operation experience shows that the chattering phenomenon of transmission lines across high-speed railways is one of the main causes of acci...

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Problems solved by technology

At present, the research on the occurrence of flutter and shedding is basically carried out around the wind vibration mechanism of overhead transmission lines, using energy balance and dynamic methods to analyze the wind vibration characteristics, or starting from improving the impact of the train flow field, focusing only on electric locomotives There is no theory for the random and non-linear vibration phenomenon of similar high-speed railway transmission lines affected by locomotive crossing. The traditional evaluation method only considers the flow field disturbance factors, and the relationship between electric field disturbance and vibration characteristics There is also a lack of research on the flutter phenomenon, most of which ignore the influence of external meteorological factors such as wind, air pressure, dust, and rain on the flutter phenomenon. The model defect problem of single, positive and negative offset of indicators, and this is seriously inconsistent with the risk of vibration and shedding accidents determined by dynamic changes and multiple influencing factors. The evaluation results cannot fully reflect the impact of cross-high-speed railway transmission lines under various environmental conditions. health impact

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