Ion Flow Field Numerical Simulation Method of High-Altitude UHVDC Transmission Lines Based on Weibull-WSE-UFEM

The ion flow field of UHVDC transmission lines is greatly affected by wind, especially in high-altitude areas where the regional and gradient differences in wind speed are significant. To accurately provide the required wind speed verification values for line parameter design, a numerical simulation method based on Weibull-WSE-UFEM is proposed in this paper. Weibull function is used to construct the probability distribution of wind speed in the studied area based on real data, and the maximum value within the appropriate range is selected as the wind speed verification value for the location of the wind speed sensor. Wind Shear Exponent (WSE) is used to expand the verification values at different positions in the vertical direction. Upstream Finite Element Method (UFEM) is used to calculate ion flow field and the verification values are used as the input wind speeds in different height nodes. The method was applied to a real high-altitude UHVDC transmission line case and the theoretical minimum height of line to ground was obtained. The results indicate that the method has certain guiding significance for the design of UHVDC transmission lines in high-altitude areas.