南方电网四省区覆冰特征分析及改进的覆冰模型

Analysis of the Characteristics of Icing in Four Provinces of China Southern Power Grid and the Improved Icing Model

我国云南、贵州、广西、广东四省覆冰灾害频发,为提高南方电网系统应对低温凝冻灾害能力,本文分析总结了南方电网区域覆冰成因及覆冰分布特征。同时基于南方电网的覆冰特性,深入研究国内外覆冰模型成果及覆冰过程机理,通过引入雾凇覆冰机制,对Kathleen.F.Jones模型进行了改进,建立了能同时计算雨凇和雾凇的新模型,弥补原覆冰模型仅考虑雨凇的不足。经覆冰过程模拟检验及模型对比检验,改进的覆冰模型具有较高的实用价值,它能有效地利用气象要素对冰厚进行恢复重建,为输电线路抗冰设计提供重要的依据。

Considering that icing disaster occurs frequently in Yunnan,Guizhou,Guangxi and Guangdong,the causes of icing and the characteristics of icing distribution in China Southern Power Grid are analyzed and summarized in this paper in order to im prove the ability of grid system to respond to the low temperature and freezing disaster. At the same time,based on the icing characteristics of China Southern Power Grid,the icing models and icing mechanism proposed both at home and abroad are studied. By introducing the mechanism of rime icing,the Kathleen. F. Jones model is improved,and a new icing model which can calculate both glaze icing and rime icing is established. The new model makes up for the original icing model,which only consid ers the glaze icing. Through the simulation test and comparison test of icing models,it is concluded that the improved icing model has higher practical values,which can effectively recover and model the icing thickness based on meteorological factors and provide reference for the anti-icing design of transmission lines.