Analysis of Power Output of Small Vertical-Axis Wind Turbinesand Environmental Turbulence

• Main Authors: Shao-Hua Tsao, 曹少樺
• Other Authors: 李坤彥
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/jmh84t

碩士 === 國立臺灣大學 === 工程科學及海洋工程學研究所 === 107 === The main theme of this thesis is discussing about the relationship between wind turbines’ power output and the environment, and have divided into two parts mainly. The first part is talking about the power efficiency of small vertical wind turbine which operates in high turbulence environment. The second part is the analysis and simulation of the test environment where the small vertical axes wind turbine located. There has complicated topography and lots of buildings in metropolitan areas. The turbulence formed as a result of the interference of the topography and obstacles in urban areas easily. The content of the first part of this thesis: It is going to measure and analyze the test environment which affects the power output of the wind turbine, such as wind direction, horizontal wind speed and vertical wind speed. According to the result of experiment, we found that over than 90% of power output was generated when vertical wind speed is less than or equal to horizontal wind speed. In addition, vertical wind speed has obvious influence when horizontal wind speed is between 6 m/s and 8 m/s, only 44% of the power output without vertical wind speed, and the turbulence intensity will converge about 30 % when the wind speed is larger than 8 m/s. We analyze the turbulence intensity by steady state simulation, transient simulation and compare with the collected data, and find some key points about the worse efficiency of this test environment. According to the result of experiment, we found that the higher building in the environment is the main obstacle, resulting in the low wind speed where the wind turbine located, and the turbulence intensity is high. We get this environment is not suitable for the operation of this test wind turbine.