This paper describes the flywheel storage system uses for the smoothing of power variation of photovoltaic generation. Since it is dependent taking the power generation energy as energy of the sun, the power variation of photovoltaic generation is very big. Therefore, frequency variation and voltage variation, when the photovoltaic generation linked the power system. And, there is a problem of the degradation of the electric power quality. In this paper, the solution of these problems was proven using photovoltaic generation, small FW and EDLC.