풍력발전을 위한 풍황분석 및 바람자원 예측에 관한 연구

Abstract

In order to provide a rough idea of wind energy resources for fundamental and applicable studies, the knowledge of the flow characteristics within the given full-scale site is prerequisite. Two 2-D ultrasonic anemometers and one cup anemometry, located perpendicular to the prevailing wind direction, have been used to measure the mean and fluctuating flow velocities at a height 4.5m. The experiments show that the Reynolds number is about 6.7×105 (based on the sensor height and the velocity from the sensor) and the friction velocity, , is about 0.32. The power-spectrum analysis on horizontal and vertical wind speed is made over a wide range of frequencies by joining various portions of the spectrum. It appears to be four major eddy-energy peaks in the spectral distribution; each peak occurs at periods of about 1 or 2mins, 8hours, 24hours and 100hours. This study is aiming to estimate the future wind resources with various wind energy estimation methods. We calculate the Monin-Obukhov length(L) against 3 typical regions of the atmospheric condition - unstable regime (-5