Evaluating the Smoothening Application of BESS for Large Solar Photovoltaic Parks

In this paper, a Battery Energy Storage System (BESS) based solution has been proposed to reduce the fluctuations in the output power of large solar Photovoltaic (PV) parks. This will contribute to reduction in the frequency deviations of large power systems and moderating pressure on conventional power plants with the increasing penetration of solar power. Solar PV smoothening is one such application of BESS to moderate inherent intermittencies of solar PV power plants. Different methods adopted for smoothening of solar PV output could lead to arrival of different sizes of the batteries. Thus, assessment of various methods to smoothen PV output power and scope of smoothening becomes significant. A technique has been proposed and has been evaluated against different existing methods for comparing the performance. The results from the proposed technique have been found to be encouraging in terms of determining the battery life and size.