Abstract
Since output of photovoltaic generation (PV) includes power fluctuation caused by natural conditions, installation of PV on a large scale is supposed to affect Load Frequency Control (LFC) of the power grid. One method to compensate power fluctuation is the use of energy storage (ES), such as batteries and capacitors. A power fluctuation compensation system composed of an electrical double layer capacitor energy storage system (EDLC ESS) and a Li-ion battery energy storage system (Li-ion BESS) is considered. Power loss characteristics of both ESSs during power fluctuation compensation are modeled by equivalent circuits based on ES impedance spectra. The models are validated through experiments simulating power fluctuation compensation. Using these ES models, simulations were carried out to determine power fluctuation dispatch method between both ESSs and ESSs' capacity in consideration of power loss minimization.
