Design wind speed analysis method and device for power transmission tower

Abstract

The embodiment of the invention discloses a design wind speed analysis method and device for a power transmission tower, and can simultaneously consider a complex terrain influence and a typhoon-combined climate extreme value distribution characteristic tail deviation influence. The analysis method includes of 1, establishing a power transmission tower target position CFD terrain model; 2, selecting meteorological stations which have a certain of historical records and are distributed at the predetermined periphery in all the directions of the target position of the power transmission tower, obtaining the wind speed ratio sequence of the predetermined height at the predetermined incoming flow positions in all the directions of the target position of the power transmission tower and the predetermined height at the target position of the power transmission tower, and through the history records of the corresponding wind speed and wind direction of the corresponding meteorological stations, obtaining the extreme value wind speed sequence of the target position of the power transmission tower; 3, sampling in the extreme value wind speed sequence through an independent storm method to obtain extreme value wind speed samples, obtaining the probability density function of the mixed climate extreme value wind speed, calculating the parameters corresponding to the probability density function through a weighted least square method, and obtaining the extreme value wind speed in a discretional return period of the target position of the power transmission tower.

Description

technical field [0001] The invention relates to the field of design reference wind speeds, in particular to a design wind speed analysis method and device for transmission towers. Background technique [0002] Typhoons frequently occur in the southeast coastal areas, and the damage to transmission towers and lines caused by this occurs every year. The relevant disaster analysis shows that the inaccurate design wind speed of transmission towers is an important reason for the damage. Whether it is the construction of transmission towers or the site selection of bridges, the terrain is usually complex, and the design reference wind speed generally cannot be checked through the wind resistance code, and special analysis and testing are required. When the traditional extreme wind speed analysis method is used for bridge construction and power station site selection, the wind speed relationship between the two is established based on the analysis of the historical record data of n...

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Problems solved by technology

[0003] The estimation of the design wind speed of the transmission tower is different from the single analysis target of bridge construction and power station site selection. The transmission tower has a large span, and there are a series of target points along the way that need to determine the design reference wind speed; at the same time, the mountainous terrain is complex, and the local wind environment affects the transmission tower. The site selection has a great influence, such as the obvious impact on the wind speed and wind direction of the tower site, and usually, there is no or lack of meteorological measurement data near the target tower site, so it is impossible to directly determine the design reference wind speed of the tower site; if the traditional method is still used in all If all the target points are to build observation stations, the construction cost will be extremely high, and the wind and climate observation period of 2 years or more is also an unbearable time cost.

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