Method for evaluating and calculating electric transmission line ice coating environment influence factors under micrometeorological condition

Abstract

The invention discloses a method for evaluating and calculating electric transmission line ice coating environment influence factors under a micrometeorological condition. The method comprises the following steps that first, on the basis of historical data provided by an overhead line structure micrometeorological station, the part with the insulator tension rapidly increasing in the micrometeorological station is sought, and corresponding micrometeorological parameters are acquired; the increasing speed of the insulator tension is calculated through a data processing formula; then, a normalization method is used for normalizing micrometeorological data with different dimensions and insulator tension data; after the above steps are completed, the correlation degree of each micrometeorological parameter and the insulator tension is calculated through a Deng grey correlation calculation formula; then, the existence time of the micrometeorological parameters is accumulated, and the accumulative time coefficient is calculated; after the above steps are completed, the calculated results are combined, and at last the method for evaluating and calculating the electric transmission line ice coating environment influence factors under the micrometeorological condition is obtained.

Description

Technical field [0001] The invention belongs to the field of overhead line safety and protection, and relates to a method for evaluating and calculating the environmental impact factor of icing of a transmission line under micro-weather conditions. Background technique [0002] Ice coating is a natural phenomenon that often occurs in winter. However, when ice coating occurs on overhead lines, it may cause harm to line safety. Statistics show that in early 2008 alone, severe line icing caused 225 500kV line fault trips to the power grid, and protection actions were about 3000 times. The disaster caused 971 outages of 707 substations within the scope of State Grid Corporation of China, resulting in power transmission. 142,984 bases (roots) of the line towers were damaged, 11,734 places were disconnected, and the direct property loss reached 10.45 billion yuan. The statistics of the disasters suffered are shown in Table 1 below: [0003] [0004] It is of great significance to the d...

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Problems solved by technology

[0005] However, the most important thing in the research on the icing prediction of transmission lines under micro-meteorological conditions is how to distinguish the influence coefficients of various micro-meteorological parameters, so as to reduce the input dimension of the prediction algorithm: the icing of overhead lines under micro-meteorological conditions is affected by many factors , which mainly includes the influence of micro-topography and micro-meteorological conditions, and there is a high degree of complexity and nonlinearity between each influencing factor and ice thickness

[0006] At present, there is no algorithm research on the influence factors of icing on overhead lines under micro-meteorological conditions at home and abroad.

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