Investigation of BESSs' benefits in transmission and distribution systems operations using integrated power grid co-optimization

This paper aims to develop a framework to study and optimize the benefits high penetrations of battery energy storage systems (BESS) in the integrated transmission & distribution (T&D) systems. A coupled T&D systems analysis framework is developed through a co-optimization approach. The following objective functions are considered in the proposed optimization approach: 1) Real power losses (PL), 2) Voltage deviation (VD) at load buses, and 3) loading margin (LM) or loadability of system. The framework is utilized to investigate the impacts of high penetrations of distributed energy resources with embedded BESS. Simulations are performed with 100 and 50 percent of BESS charging capacity. The proposed framework is examined on the IEEE 118-bus system. The results show that the installation of distributed BESSs at the distribution side, decrease the PL and VD and also improve the system total LM.