Charging and Discharging Control Method of Small Capacity Energy Storage System to Improve Power Generation Amount of Photovoltaic Generation System

Abstract

This paper proposes an energy storage system for the improvement of the amount of power generation in a photovoltaic generation system. The proposed system can be easily incorporated with an existing system because it must be connected to the input terminal of the power conditioning system. The proposed charging and discharging control method does not disturb the MPPT control of the PCS and maximum power point operation of the PV panel. The basic operation of the proposed control method is verified by experimental results. In addition, it is confirmed by experimental results using solar radiation data that the generated power amount improved by 14.2% owing to the continuous operation of the PCS. These results show that the proposed energy storage system can improve the power generation of an existing solar power generation system.