Near-Surface Wind Speed Fluctuation and its Impact on Wind Power in Jiuquan

Abstract

With the use of representative observed wind speed data for a whole year in Jiuquan field in Gansu province of Hexi Corridor ,we analysed the characteristics of ten-minutes wind speed, diurnal wind speed, monthly wind speed variation , as well as the influence of the wind power change rate in different time periods and diurnal variation in four seasons. Studies have shown that ten-minutes short-term wind turbulence characteristics was more obvious, with some randomness , but mainly exhibited typical diurnal characteristics of variation. In addition to mean state of wind conditions, there were sustained gale, short-term gale, continued small wind, regular small wind appeared. Monthly variation of wind speed is characterized by the "three peaks and three valleys" , showing the regular change that wind speed was larger in spring and summer , and it was smaller in autumn and winter. Daily fluctuation of wind electricity generation in four seasons presented similar trends, it was a peak-valley feature, valley generally appeared between 9-11 a.m., the peak occurred between 5-7 p.m..Wind power got larger between 1 and 11 p.m., this period was the peak electricity needed, wind power added can significantly ease the power grid pressure and will has significant positive effect for the power grid control. Ten-minute power variation was relatively stable, with the time interval increased, variation in electricity generation of one day rate increased gradually.