Influence of Battery Energy Storage Location on the Dynamic Performance of Hybrid AC/DC Microgrid

Energy storage systems provide ancillary services as well as minimization of power fluctuations caused by intermittent renewable energy sources (RES) and variable loads in microgrids. Energy storage selection criteria in microgrids are usually based on power management and economic aspects, neglecting its dynamic performance functionality. In this paper, a comprehensive study of the impact of the Battery Energy Storage System (BESS) placement on the dynamic performance of Hybrid AC/DC Microgrid (HMG) is presented. For the evaluation purposes, two major locations, such as the AC grid or DC grid, are considered for the BESS. The detailed dynamic model of the test HMG system is simulated under various disturbances cases when the BESS is operated either in AC or DC subgrid. Simulation results show that the HMG with both BESSs is resilient against disturbances. However, the DC side BESS has superior performance to the AC side BESS in controlling large-signal grid disruptions.