内蒙古东部电网最大风速及其重现期极值分布特征

Distribution of Maximum Wind and Extreme Wind Speeds in Eastern Inner Mongolia Power Giad

利用内蒙古东部48个气象站有自记式风速仪记录以来的逐年10min最大风速资料,采用极值Ⅰ型计算方法,给出了该地区重现期30年、50年和100年的极值风速分布图,并分析了近30年最大风速和极值风速的分布特征。结果表明:近42年来内蒙古东部年最大风速具有明显的阶段性下降趋势,减小速率约为每10年1.4m/s;最大风速的年内变化为双峰型,年最大风速主要出现在春季;偏西风的最大风速较大,出现年最大风速的频率高达70%;年最大风速值和极值风速的分布总体呈自西向东减小趋势,但也存在明显的区域性分布特征。该结果将为内蒙古东部电网的设计、运行和维护提供重要的参考依据。

Based on the 10-minute maximum wind speed data of 48 weather stations over the eastern Inner Mongolia,the distribution maps of extreme wind speed of 30-,50-,and 100-year return periods,which are calculated by using the type-Ⅰextreme distribution function,are drawn and analyzed.The characteristics of maximum wind speed in 1980-2010 are also analyzed.The results show that the annual maximum wind displayed a phased downward trend in the past 42 years,with the decreasing rate being 1.4m/s per 10 years.The annual variation of maximum wind shows a double-peak curve with the annual maximum wind in spring mainly.The annual maximum wind speed mainly appears in west direction（W to NNW）with a frequency of 70%.In general,the distributions of maximum wind and extreme wind speeds show a decreasing trend from west to east,but has obvious regional characteristics.The results can provide important references for the design,operation,and maintenance of the eastern Inner Mongolia power grid.