Verification between Theoretical Distribution and Observed Data of Wind Speed Related to Wind Turbine Design
Date Issued
2014
Date
2014
Author(s)
Liao, Yu-Chi
Abstract
The present thesis analyzes wind data collected from Changhua coastal areas in western Taiwan for the purpose of constructing wind-speed probability models which are closely related to the design, construction and operation of wind turbines. The data are hourly wind speeds recorded form October 2012 to September 2013 by Center Weather Bureau, Ministry of Transportation of Taiwan. Data for the above hourly average wind speed are fitted by appropriate probability density functions based on hourly, daily, monthly, quarterly, and annually collected wind speeds, respectively. The extreme value distribution of wind speed derived from order statistics is also investigated. The above probability distributions of wind speed and extreme value of wind speed are closely related to the structural safety of wind turbines. The probability distribution of wind speed during typhoon period is also studied, primarily considering that it has a Pareto distribution. It is found that the extreme value distribution fits the collected wind data very well. It is also found that the generalized Pareto distribution is appropriate to describe the extreme wind speed during typhoon periods. The distribution s a heavy-tail one, and the analytical result is helpful for us in selecting a threshold wind speed for the safe shutdown of a wind turbine during typhoon period. In the final part of this thesis, the offshore wind speed is assumed to have a Weibull distribution. The construction of offshore wind turbines near Taichung harbor is given as an example.
Subjects
可靠度工程
風力發電
離岸風力機
風速統計
極值分佈
Pareto 分佈
Type
thesis
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