풍력터빈 스피너에 설치된 3축 초음파풍속계의 회전측정기법을 활용한 풍향풍속 측정 = Measurement of Wind Direction and Speed with a Three-axis Ultrasonic Anemometer Installed on a Wind Turbine Spinner

다국어 초록 (Multilingual Abstract)

In previous studies, a measuring technique for wind direction and speed with a roll-rotating horizontal three-axis ultrasonic anemometer was proposed and verified by wind tunnel tests. In this study, it was applied to a 4.3 MW wind turbine that has a nacelle anemometer and a wind lidar. In subsonic flow, the upstream is affected by downstream blockage such as a spinner, wind turbine blades, and a nacelle. From a blockage effect study with CFD analysis, the measuring point of the ultrasonic anemometer was selected and blockage correction equations were derived. At the measuring point, the wind speed and wind direction relative to the wind turbine, the so-called yaw error, were measured by the proposed technique and corrected with the derived equations. As a result, the blockage correction reduced the deviation of yaw error but overcorrected wind speed. So, the proposed method may be efficient for wind turbine yaw control because it has smaller yaw error fluctuation than a nacelle anemometer and a wind lidar. Blockage correction with met mast tests instead of CFD would produce better results. Various environmental tests such as in rain, snow, and dust in wind would also be a prerequisite for actual utilization.

참고문헌 (Reference)

1 장병희, "롤 회전하는 3축 초음파 풍속계를 활용한 풍향 풍속 측정기법(II)" 한국풍력에너지학회 9 (9): 9-15, 2018

2 장병희, "롤 회전하는 3축 초음파 풍속계를 활용한 풍향 풍속 측정기법" 한국풍력에너지학회 9 (9): 5-12, 2018

3 Kragh, K. A., "Rotor Speed Dependent Yaw Control of Wind Turbines Based on Empirical Data" American Institute of Aeronautics and Astronautics 9-12, 2012

4 Schlipf, D., "Prospects of Optimization of Energy Production by LIDAR Assisted Control of Wind Turbines" EWEA 14-17, 2011

5 Froese, M., "Increase AEP by 2% With Improved Wind Measurement" Windpower Engineering & Development Webinar Series

6 "Gill Instruments"