Fluctuation Analysis of a Hybrid Natural Energy Generation System of Multiple Small Wind Turbines and a Small Solar Panel

(1)在琉球大学工程学院楼顶搭建了由3台直径2.7m的1kW卧式风力发电机（WTG）组成的小型实验风电场，并对其性能和一年左右的输出波动特性进行了测试。结果表明，由于结构原因，小水团的波动几乎是相互独立的。因此，确定风电场总出力波动比小于单个WTG出力波动比。(2)将800W光伏发电板引入上述风电场，考察其波动情况及对风电场系统的影响。太阳能电池板的波动表现为WTG在高于2.0Hz左右的高频区域的分量较高，在低频区域的分量较低。从而明确了不同功率发电机的混合系统也具有降低总波动比的作用。(3)作为新型小型WTG的建议，设计了4.0m直径3kW变节距WTG。该机的特点是采用步进电机，蜗杆传动，微机控制，采用变节距传动。高达直径约10米的WTG，我们计划引入这种新系统，并提供稳定和易于维护的小型风力发电机。

(1) A small experimental wind farm consisting of three 2.7m diameter 1kW horizontal wind turbine generators (WTG) was constructed at top of a building of the Faculty of Engineering, University of the Ryukyus, and examined their performances and the characteristics of output fluctuation about a year. As the result, it is cleared that the fluctuation of small WTG is almost independent to each other becaouse of their structural reason. Therefore, fluctuation ratio of the summed up output of the wind farm was confirmed to be smaller than that of the individual WTG output.(2) A 800W photovoltaic power panel was introduced to the above mentioned wind farm and investigated its fluctuation and the effect on the farm system. The fluctuation of the solar panel showed the higher components that the WTG in the higher frequency region than about 2.0Hz, and the lower components in the lower frequency region. So that it was cleared that the hybrid system of the different power generator also has the effect to reduce the total fluctuation ratio.(3) As a proposal of new small WTG,4.0m diameter 3kW and variable pitch WTG has been designed. The characteristics of the machine are the variable pitch with stepping motor, worm gearing system drive and micro computer control.Up to about 10m diameter WTG,we have planned to introduce this new system and to offer the stable and maintenance easy small wind turbine generators.