Abstract
Application of Battery energy storage systems in power grids will expand in the coming years due to reducing costs of such systems. As a result, understanding the behavior and control requirements of such systems is very important. In this project, a bidirectional AC/DC converter and a bidirectional Boost DC/DC converter have been used for charging/discharging batteries. It is desired that the system containing converters and batteries will be able to control active power, reactive power, and the DC link voltage independently. For this purpose, proper circuit models of power electronic converters as well as batteries have been simulated and controlled using SimPowerSystems (a toolbox under MATLAB/SIMULINK). In the AC/DC converter, Voltage Oriented Control has been used for independent control of active and reactive powers, and the duty ratio of the DC/DC converter has been controlled for regulating the DC link voltage.