Development of a New Algorithm for Stabilizing Power Fluctuation in PV System

Abstract

Recently, the penetration of renewable energy such as photovoltaic generation (PV) and wind turbine generation is rapidly increased. However, large-scale PV output power fluctuation is caused negative impact on power grid. Therefore, the fluctuation of PV must be smoothed using energy storage system such as a battery. Generally, moving average method is used to stabilize the power fluctuation, but there is a problem that it is difficult to be compatible PV power stabilization and reduction of battery capacity. This paper proposes a new algorithm for stabilizing fluctuation in PV system, DFC (De-trended Fluctuation Component) method, which stabilizes only short-term fluctuation of PV. We calculated battery capacity to stabilize PV output power fluctuation using moving average method and DFC method. The result shows that the DFC method can reduce maximum battery capacity by 7.6% compared to moving average method.