Hybrid Reaching Law-Based Integral Sliding Mode Control for DC Microgrid

The rapid adoption of renewable energy technology has made the microgrid concept to be widely accepted in modern power systems. Renewable energy resources in DC microgrids operate intermittently which affects the power supply and the load. This has made the bus voltage control to become very difficult. Several control strategies, including PID control, droop control, model protective control (MPC), sliding mode control (SMC), and others, were proposed to effectively regulate the bus voltage. However, these control strategies are prone to issues such as poor dynamic response, robustness, chattering, and inaccuracy. This paper proposes an integral sliding mode control based on hybrid reaching law technique for battery energy storage system (BESS) to address the issue of external disturbances, modelling errors, and dynamic response in DC microgrid system. The effectiveness of the proposed technique has been verified in a MATLAB/Simulink environment. The simulation result shows that the proposed controller has maintain the nominal bus voltage and the comparative study confirms the effectiveness of the proposed strategy over the existing strategy.