Optimal SOC limit estimation of ESS considering renwable energy sources

There have been increasing concerns about the ESS, in order effectively to deal with the volatility of the system. For those with renewable energy, resulting in the uncertainty of power output, the ESS can prevent possible negative outcomes from a sudden change of load in a short time and simultaneously reinforce electricity supply. In addition, considering the facilities in which the system is surrounded and the purpose of the installation, the accurate SOC of the ESS is determined, and it results in an increase of the efficiency of power supply and the reliability. In this paper, the efficiency for renewable energy is enhanced and at the same time, the ESS with the UPS features is adopted, so as to perform for unplanned blackout. In doing so, the operation algorithm of the ESS based upon renewable energy resources is suggested and the optimal SOC limit is also assessed. In the end, by estimating the reliability of the ESS that involves the UPS system, the quantitative comparison will be made between the existing system and the new system.