Meteodyn WT를 이용한 제주 육상풍력단지 설계

Abstract

The investigation on wind farm design using CFD technique was carried out to reduce turbulence intensity in a wind farm then the design method for maximum Annual Energy Production, AEP, and minimum turbulence intensity was proposed with combination of WindPRO and Meteodyn WT. Since the flow model of WAsP utilizes two dimensional linearized equation to calculate the wind resource, it can not be used steeper terrain than 15 degrees or more. To solve this problem, the commercial software Meteodyn WT was introduced in this study, which utilizes Navier-stokes equation with three dimensional coordinate to improve the accuracy of calculation of wind resource. A potential wind farm in Gasiri of Jeju Island was selected where 55m-met mast data was collected for 31 months. The initial layout of wind turbines with maximum AEPs was derived using WindPRO which is mainly used for wind farm design in South Korea and is highly known to the wind industry around the world. Then the distribution of turbulence intensity on complex terrain of the potential wind farm was calculated and visible by Meteodyn WT. Based on the distribution, wind turbines were positioned manually. Three times iteration were performed additionally to find the positions where wind turbines have minimum turbulence intensity and maximum AEP. The distances between turbines were 5 rotor diameter, D, 6D and 7D, of which 6D was identified as the best layout for the purpose of this study. As a result, wind turbines could be deployed at positions with 7.78% reduction in representative turbulence intensity and 2.23% increase in AEP. The final layout did not meet the category of higher turbulence intensity of 16% specified in IEC standards 61400-1 because of higher turbulence intensity at the potential wind farm surrounded by complex terrain. It is necessary to take into account wake effect in wind farm design to obtain maximum AEP and avoid wind turbine failure in order to guarantee wind turbine's lifetime.