250 kw 급 수상태양광시스템의 파랑 중 운동응답에 관한 모형시험 연구

Abstract

In this study, the motion characteristics of the 72 connected floating photovoltaic systems are investigated by model tests. The model tests were carried out in the ocean engineering basin of Korea Research Institute of Ships and Ocean Engineering.The scale ratio of the model was selected to 1/10 considering a model size and wave conditions. A unit of floating photovoltaic system consists of the frame, solar panels, buoyancy modules and connecting parts. The 250kW floating photovoltaic system has a 9x8 array. A unit is connected to another unit by joints. The 6 dof motion of 6 selected units were measured by the optical measuring system and the 3 dof motion was measured along the centerline to identify basicmode shape. The motion RAOs (Response Amplitude Operators) were obtained with the regular wave and white noise tests in the head sea and quartering sea. In the head sea, the pitch RAO is quite large around wave frequency 2.06 rad/s. The large motion can be explained through the ratio of structure length and wavelength. When the wavelength is short, the front unit moves with the incident wave and the motion of the rear unit is small because the front unit attenuates waves. In the headquartering sea, the roll and pitch motion is relatively small, but the multi-body motion may affect the joint loads and the frame stress. It seems that load analysis of connecting parts and frames is necessary considering the motio