Battery energy storage system for transient frequency stability enhancement of a large-scale power system

Power system stability has become a great concern with the increased power flows across the transmission system. Battery energy storage system (BESS) has widely been used and long been acknowledged that it can significantly contribute in stable power system operation and control. This paper investigates a large-scale power system transient stability improvement by incorporating a large size BESS. Faults have been applied to find the maximum active power transfer limit across the transmission line. The control of BESS is so designed that battery charging/discharging is based on the nominal system frequency as a reference. In addition, faults on the DC side of BESS are also studied to determine their impact on the connected AC system stability. MATLAB/SIMULINK based simulation has been carried out to demonstrate the capability of BESS for providing stability support and also reducing DC faults impact on the connected AC system stability.