An efficient PV-Energy storage DC Microgrid utilization scheme

Abstract

The proliferation of Renewable Energy Resources (DER's) into Direct Current (DC) microgrids, growing rapidly, have attracted great consideration of the researchers providing numerous challenges, compared to AC microgrids. With the coupling technology for DER”s., the main benefit of power electronics is the capability to provide effective control in order to deal with voltage variations related to renewable sources intermittency and load disturbances. In this paper, a non-linear method based on sliding mode control (SMC) is implemented in order to control the bidirectional converter of the storage system component and ensure the stable operation of the MG. In fact, voltage regulation and system stability are crucial tasks in order to ensure the stable operation of islanded DC microgrid. The effectiveness and robustness pertaining to the proposed controller compared to proportional integral (PI) controller are validated through MATLAB/Simulink simulation under sudden variations of power sources and load. Lastly, results show superiority and demonstrate that the proposed method has a good performance in reducing and eliminating voltage oscillations and voltage ripples that jeopardize the system stability. Bus voltage stabilizing and power quality enhancement are realized and achieved.