Renewable energy such as solar light has attracted attention as an alternative energy source to fossil fuel. The output power in photovoltaic generation systems changes steeply. The change in the output power influences the electric power quality of the power system. Therefore, a system that can smoothen the fluctuation of the output power is desired. In this study, we applied the methods of moving average and exponential smoothing to the electric power smoothing control schemes for distributed generation systems and compared their effects. The reduction rate of the power fluctuation and the maximum stored energy of electric double layer capacitors are adopted as the basis for the evaluation methods of the system.