Risk assessment method for strong wind tripping of transmission lines based on multi-parameter wind loads

Abstract

The invention belongs to the power transmission line risk early warning assessment technical field and relates to a multi-parameter wind load-based power transmission line strong wind tripping risk assessment method. The tripping risk assessment method includes the following steps that: step 1, daily data of a county-level observation station of the meteorological department are analyzed; step 2: the coordinates of a power transmission line tower are substituted into a space interpolation function, so that wind parameters along a line can be obtained, and respective three wind load parameters of the tower, a conductor, a ground wire and an insulator string are calculated respectively; step 3: a wind load three-parameter-based five-level assessment table is built; and step 4, the tripping risk of the line under a strong wind condition can be determined. With the risk assessment method of the invention adopted, errors caused by meteorological statistics can be avoided; three-parameter wind load is adopted to assess the tripping probability of the line under the strong wind condition, and the sustainable effect of the wind load is considered comprehensively, and therefore, assessment is more comprehensive.

Description

Technical field [0001] The invention relates to the technical field of risk early warning assessment of power transmission lines, in particular to a method for assessing the risk of strong wind tripping of power transmission lines based on multi-parameter wind loads. Background technique [0002] Gale disaster is a huge natural disaster, threatening the safety of people and property. The transmission line covers a wide area, and the meteorological environment along the line is complex, and it is directly exposed to the atmospheric environment. It is extremely vulnerable to strong wind weather. Gale disaster causes the transmission line to trip. One of the main natural factors, such as a strong typhoon that has caused great harm to the power equipment in coastal areas, and its occurrence time is mostly during the peak summer period. The transmission lines are mostly high-load operation. In the event of a disconnection and tower collapse accident, It will not only cause heavy losse...

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Problems solved by technology

[0003] A Chinese patent document, application number: 201210378284.9, patent name: "A GIS-based Wind Speed ​​Warning Information Processing Method for Transmission Lines", which divides the area distributed with transmission lines on the GIS map into several grid areas; The position information of the transmission line towers in the grid area, and calculate the direction of the transmission line between the two towers, and save it; obtain the wind speed information and wind direction information in each grid area from the public network; according to the obtained information, Judging whether there is risk in each tower; according to the result of risk judgment, early warning information is released; the shortcoming of this method is that the risk assessment is carried out by comparing the predicted wind speed with the design wind speed, without considering the continuous effect of strong wind; and the predicted wind speed uses a grid Acquired by method, the accuracy is poor

The disadvantage of this method is that the core is to use the maximum wind speed for evaluation, without considering the continuous effect of strong wind

Regarding the risk assessment of transmission line tripping in strong wind weather, the core is to evaluate the characteristic quantity of the maximum wind speed, but there will be a cumulative effect on the transmission line under the action of strong wind, and the continuous strong wind will accelerate the mechanical fatigue of the transmission line, which is more likely to cause tripping accidents. However, there is no relevant method yet, considering the continuous effect of strong winds, the assessment is not comprehensive

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