후류가 하류 풍력발전기의 발전량에 미치는 영향

Abstract

본 연구에서는 해안 복잡지형에 2열 배치된 풍력단지 운영사례를 분석하여 후류에 의한 풍력발전기의 영향을 분석하여 풍속의 변화 그리고 난류강도의 변화를 분석하였다. 주풍향 대비 인접 풍력발전기와 이격거리가 날개직경의 4배인 경우 후류에 의해 풍속감소 및 난류강도의 증가로 인한 발전량의 감소를 확인 할 수 있었다. 특히 후류에 의한 급격한 순간풍향의 변화 시, 풍력발전기의 불시정지로 발전량이 현저히 감소되었고 이를 보완하기 위하여 요브레이크를 설비를 보강함으로써 불시정지 빈도를 감소하고 발전량을 제고하는데 효과가 있음을 확인할 수 있었다.|In this study, the effect of wake on the energy production of a downstream wind turbine is analyzed on the base of operation practices of wind farm in the costal complex terrain which has 2 row array of wind turbines. And the changes of wind speed and turbulence intensity is analyzed. In case wind turbine are spaced 4RD(rotor diameter) apart in the prevailing wind direction, reduction in energy production is confirmed due to the decrease of wind speed and the increase of turbulence intensity by wake. Especially a radical change of wind direction caused wind turbine a sudden stop and energy production significantly reduce. It is considered improvement of yaw brake can prevent the sudden stop and increase energy production; In this study, the effect of wake on the energy production of a downstream wind turbine is analyzed on the base of operation practices of wind farm in the costal complex terrain which has 2 row array of wind turbines. And the changes of wind speed and turbulence intensity is analyzed. In case wind turbine are spaced 4RD(rotor diameter) apart in the prevailing wind direction, reduction in energy production is confirmed due to the decrease of wind speed and the increase of turbulence intensity by wake. Especially a radical change of wind direction caused wind turbine a sudden stop and energy production significantly reduce. It is considered improvement of yaw brake can prevent the sudden stop and increase energy production