Analysis and Simulation of Measured Wind Speed and Wind Speed Correction Method of Tower Under Microtopography

Abstract

The operation safety of transmission lines is greatly affected by strong wind, but the previous research lacks the measured wind speed data and ignores the influence of micro topography on wind speed coefficient. Based on the measured data of meteorological stations, this paper studies the distribution characteristics and recurrence period of wind speed, completes the correction and Simulation of fluctuating wind speed spectrum, obtains the micro terrain parameters of transmission lines through Google Earth, proposes four kinds of wind speed correction methods under micro terrain, and calculates the wind speed correction coefficient. The results show that GeV model is more suitable for fitting probability distribution density of wind speed in Jiangsu Province. The design wind speed of UHV transmission tower in Jiangsu area should be between 34.5 m/s and 39 m/s. According to the time history data of wind speed in the period of monsoon typhoon monsoon, the fluctuating wind speed spectrum is highly consistent. When the tower nominal height is 1, the wind pressure correction coefficient increases with the increase of peak height or slope angle; when the tower nominal height / mountain height is higher than 3.0, the wind pressure correction coefficient is fixed. The research results can accurately calculate the wind speed of the tower in the micro terrain area near the meteorological observation station based on Google Earth micro terrain data.

Keywords

• measured wind speed
• transmission lines
• tiny terrain
• wind speed correction
• recurrence interval