Evaluation of battery energy storage system for frequency control in microgrid system

Smart grid is a driving force for the development associated with renewable technologies. The use of renewable energy sources for electricity production has been increasingly brought into attention. Basically, the power generated from these sources may cause the fluctuation of the electrical power affecting the quality and reliability of the power system. Therefore, the proportion of electrical power generated by renewable energy sources into the power grid must be controlled appropriately. The appropriate ratio of the renewable power generation can be evaluated from the Power Ramp Rate (PRR). The value of PRR that initiates the power system to become unstable is called the critical PRR. In this paper, to find the minimal required energy for frequency stabilization from the battery system, PRR is considered in the evaluation. The simulation results demonstrate that PPR is very useful index in determining the appropriate size of power and energy of the battery system to keep the frequency deviation of the power system within the standard limit.