PDF(Pubmed)
Abstract：
of wind characteristics and assessment of wind energy resource is carried out at a location in Tonga with the help of twelve months of measurements carried out at 34 m and 20 m heights above ground level. The daily, monthly and annual averages are computed. The wind shear analysis and its diurnal variation were studied and compared with the temperature variation. The turbulence levels at the two heights were estimated for the entire measurement period as well as for some typical days. For estimating the Weibull parameters, eleven methods were employed along with goodness of fit and error estimates to find the best method. The overall averaged wind speed for the entire period of study is estimated to be 4.41 m/s at 34 m above ground level. The predominant wind direction was south-east for Tonga. \'Moments\' is seen to be the best method to determine accurate Weibull parameters. The average net annual energy production from one Vergnet 275 kW wind turbine is 198.57 MWh. A payback period of 8.95 years by installing five turbines near the measurement location was estimated, which is very encouraging in terms of investment. Installing wind turbines will lower the heavy reliance on the imported fossil fuels in the country and also help in achieving Sustainable Development Goal 7.
摘要：
在汤加的一个地点进行了为期12个月的测量，在地面以上34m和20m的高度进行了测量。每日,计算每月和每年的平均值。研究了风切变分析及其日变化，并与温度变化进行了比较。在整个测量期间以及一些典型的日子里，估计了两个高度的湍流水平。为了估计威布尔参数，采用了11种方法，以及拟合优度和误差估计，以找到最佳方法。在整个研究期间，在高于地面34m处，总平均风速估计为4.41m/s。汤加的主要风向是东南方向。“矩”被认为是确定精确威布尔参数的最佳方法。一台Vergnet275kW风力涡轮机的年平均净能源产量为198.57MWh。通过在测量位置附近安装五台涡轮机，估计投资回收期为8.95年，这在投资方面非常令人鼓舞。安装风力涡轮机将降低该国对进口化石燃料的严重依赖，并有助于实现可持续发展目标7。
