Abstract
Power systems are transitioning into a new era by replacing fossil sources of energy with renewable resources. Due to factors such as intermittent nature of renewable, application of energy storage systems such as Battery Energy Storage Systems (BESS) will be expanded in the coming years in order to smooth the variability of generation associated with renewable. The BESS can be applied in modern power grids, and it can economically shave the peak-load to prevent energy loss. As a result, it is essential to understand the operational behavior and control requirements of BESS. This project is a continuation of a previous work based on a state-space model for a bidirectional AC/DC converter and a bidirectional DC/DC converter for charging and discharging of batteries. It is desired that the system containing converters and batteries will be able to control the active power, reactive power, and the DC link voltage independently. This project will focus on integration of the state-space model(s) of batteries with bidirectional AC/DC and DC/DC converters in order to form a unified state-space model with charging/discharging modes.