Precise Voltage Regulation in DC Microgrid using A Novel Non-Linear Sliding Mode Controller

DC Microgrids are vital in integrating renewable energy sources and supplying power to different critical and non-critical loads. However, this system's fundamental challenges are maintaining the voltage at the DC bus and equal current sharing among the parallel-connected converters even when the sources and loads are dynamic. This paper presents a novel non-linear discontinuous sliding mode controller for two Solar Photovoltaic, and a Battery Energy Storage System (BESS) based DC Microgrid. The proposed control technique precisely regulates the DC bus voltage and maintains equal load current sharing. Also, State of Charge (SoC) and Voltage-based charging and the discharging algorithm are implemented for the battery-interfaced bidirectional converter. In addition, the load shedding scheme for the non-critical loads is also implemented. The MATLAB simulation results ensure the DC Microgrid's desired operation under different operating conditions.