Characteristics for wind energy and wind turbines by considering vertical wind shear  

作　　者：郑玉巧 赵荣珍 

机构地区：[1]Key Laboratory of Digital Manufacturing Technology and Application of Ministry of Education (Lanzhou University of Technology)

出　　处：《Journal of Central South University》2015年第6期2393-2398,共6页中南大学学报（英文版）

基　　金：Project(51165019)supported by the National Natural Science Foundation of China;Project(1308RJYA018)supported by Gansu Provincial Natural Science Fund,China;Project(2013-4-110)supported by Lanzhou Technology Development Program,China

摘　　要：The probability distributions of wind speeds and the availability of wind turbines were investigated by considering the vertical wind shear. Based on the wind speed data at the standard height observed at a wind farm, the power-law process was used to simulate the wind speeds at a hub height of 60 m. The Weibull and Rayleigh distributions were chosen to express the wind speeds at two different heights. The parameters in the model were estimated via the least square(LS) method and the maximum likelihood estimation(MLE) method, respectively. An adjusted MLE approach was also presented for parameter estimation. The main indices of wind energy characteristics were calculated based on observational wind speed data. A case study based on the data of Hexi area, Gansu Province of China was given. The results show that MLE method generally outperforms LS method for parameter estimation, and Weibull distribution is more appropriate to describe the wind speed at the hub height.The probability distributions of wind speeds and the availability of wind turbines were investigated by considering the vertical wind shear. Based on the wind speed data at the standard height observed at a wind farm, the power-law process was used to simulate the wind speeds at a hub height of 60 m. The Weibull and Rayleigh distributions were chosen to express the wind speeds at two different heights. The parameters in the model were estimated via the least square（LS） method and the maximum likelihood estimation（MLE） method, respectively. An adjusted MLE approach was also presented for parameter estimation. The main indices of wind energy characteristics were calculated based on observational wind speed data. A case study based on the data of Hexi area, Gansu Province of China was given. The results show that MLE method generally outperforms LS method for parameter estimation, and Weibull distribution is more appropriate to describe the wind speed at the hub height.

关 键 词：Weibull distribution wind power vertical wind shear power-law process parameter estimation 

分 类 号：TM614[电气工程—电力系统及自动化]