Sliding Mode Current Control in Multiple Batteries Based DC Microgrid

This article presents a variable structure model for a DC microgrid system, comprising photovoltaic (PV) and multiple batteries connected to a DC bus. It includes a brief overview of Sliding Mode Control (SMC), covering the existence condition, hitting condition, and switching law for the system under study. The article also discusses a comprehensive control scheme, featuring an outer voltage PI controller and a reference current generation module that distributes the current demand among the batteries based on their state of charge. SMC is used for inner current control. The performance of the SMC is compared with that of a PI controller for inner current loop. Simulations are conducted in MATLAB/Simulink under varying irradiance and load conditions.