Simulation Of Ice Accretion On The Wire Based On WRF Model

With the continuous development of China's transmission lines,such as the western development,the gradual implementation of the development strategy of the transmission of electricity from the west to the east,there will be more high-voltage and ultra-high voltage transmission lines through ice-accident disaster-prone areas,The demand for a system on the forecast for ice accumulation on the power transmission lines and other departments is very eager.In order to meet the demand,this paper has used the wire ice accretion observation data,ground observation data,and NCEP reanalysis data in North China and Henan in 2010 and 2013.Two cases of frozen rain and haze ice accretion were simulated separately,and the weather conditions,meteorological elements and ice accumulation thickness were simulated and analyzed at the same time.An attempt was made to explore whether the model can predict the thickness of ice accumulation in North China and analyze the causes of possible errors,which may deepen the understanding of the causes and thickness predictions of wire ice accretion,and provide reference for the construction of a system that meets the requirements of the power sector for ice accumulation warnings.The specific conclusions are as follows:(1)There are obvious differences in weather conditions during the formation of freezing rain and haze.West Siberian vortices moved eastward and southward.After the vortices,the northwestern turbulence and the warm-to-wet air flow converged in Henan.At the same time,under the influence of high-altitude ridges,large inversion zones were generated.This was the main weather reasons of the occurrence of frozen rain during February 8-11,2010 in Henan.On the other hand,the persistent influence of the smooth airflow before the weak high-pressure ridge in the Ural Mountains led to the formation of haze weather in Northern China in January 2013.(2)Changes in the precipitation,wind and other conventional meteorological elements,simulated by using the WRF model are generally consistent with the development of ice accumulation,but there are some differences between the simulated values and the observed values.(3)Based on the WRF model-simulated meteorological field,the Jones ice accretion growth model and Makkonen's ice accretion growth model,the temporal and spatial distribution variations of the maximum ice accretion thickness during the two ice accretion processes were simulated.Compared with the observation data from meteorological observation sites and national grid,the time variation and spatial distribution variation of ice thickness are in good agreement with the observations.(4)Due to WRF model simulation of meteorological field and observation errors,the Jones model and the Makkonen model were used to simulate the maximum ice thickness.The simulation accuracy is relatively rough and lack of sufficient consideration of terrain factors,the impact of the model's own meteorological threshold and other factors,There are differences between the simulated maximum ice thickness and the observed value at different sites.It is proved that these two models can predict and warn the wire ice accretion to a certain extent,but they need to be optimized with more detailed observation data to meet the needs of the power department and other forecasting and warning models for wire ice accretion.