Risk assessment method for flutter shedding in multi-dimensional meteorological environment across high-speed railway transmission lines

Abstract

The present invention relates to the technical field of power grid disaster prevention and mitigation, and specifically refers to a multi-dimensional meteorological environment tremor shedding risk assessment method across high-speed railway transmission lines, including S1, basic random variables of tremor shedding response; S2, tremor shedding risk assessment Importance measurement index system; S3. Determine the general evaluation standard, analyze the importance measurement index of basic variables; S4. Calculate the importance measurement index of specific basic random variables; S5. Evaluate tremor conditions, multi-dimensional meteorological environment, whether there is high-speed rail, etc. The degree of influence of multi-factor random variables on the electric field and flow field disturbance of the cross-high-speed rail transmission line; S6, the correction and update of the importance measurement index; S7, the real-time vibration and shedding risk assessment of the specific cross-high-speed rail transmission line. The present invention introduces multi-dimensional meteorological environment variable factors in the risk assessment of trembling and shedding of cross-high-speed railway transmission lines, and combines the importance measurement analysis method to update the importance measurement of each index in the risk system in real time, and the obtained evaluation results are more consistent actual.

Description

technical field [0001] The invention belongs to the technical field of power grid disaster prevention and mitigation, in particular to a method for assessing the risk of flutter and shedding in a multi-dimensional meteorological environment across high-speed railway transmission lines. Background technique [0002] In recent years, with the strong support of the State Council's approval of the development program of the "Medium and Long-Term Railway Network Planning", 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 will directly threaten the safety of the operation of the transmission line and the power system through the adjacent area of ​​the overhead transmission line. Long-term operating experience shows that the chattering phenomenon across high-speed railway transmission lines is one of the main causes of tr...

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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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