Control of AC-DC Hybrid Microgrid in the Presence of BESS and a Scheme to Limit Sudden Power Transfer

This paper presents a simulation of a hybrid AC-DC microgrid on the MATLAB/Simulink platform. Each side of the microgrid has one PV generator, while the dc side has a BESS connected. Simulations are done for islanded and grid-supported modes of the microgrid, and the importance of BESS in providing stable voltage in an islanded microgrid is highlighted. A scheme is proposed that employs BESS to limit sudden change in power flow through the main converter due to switching dc loads in grid-supported mode. The scheme requires BESS to inject/absorb power into/from the dc bus as calculated from voltage imbalance in dc side.