Abstract:

As the utilization of fossil fuels and coal leads to climate changes and global warming, the renewable energy generation such as PV and wind power has been developing at a fast pace. However the renewable energy resources which are influenced by nature factors are mostly with randomness and intermittency. When the photovoltaic plant is connected to grid, it will be confronted with reliability problem. This paper takes grid-connected photovoltaic plant as a study subject and the output power smoothing as a target. The model allocates the energy storage system based on Discrete Fourier transform theory and the fluctuation constraint is always satisfied while translating the time window when optimization is finished. In this way the impact of traditional photovoltaic plant on the grid is reduced effectively. The method adapted in this paper is easy to satisfy different fluctuation constraints and be applied in practice. Finally the proposed method is verified on a photovoltaic plant in the case study section.

Key words: grid-connected photovoltaic plant, output power fluctuation smoothing, DFT, energy storage