Modelling and Simulation of Microgrid in Grid-Connected Mode and Islanded Mode

This paper presents the modelling and simulation of an 80kW AC microgrid network in MATLAB/Simulink environment. The network comprises a 50 kW photovoltaic system, a 10 kW fuel cell system, and a 20 kW battery energy storage system (BESS). The model is simulated under four operating conditions: (i) grid-connected mode, (ii) islanded mode (iii) islanded mode with excess power generation from Distributed Energy Resources (DERs) and (iv) islanded mode with limited power generation from DERs. Simulation results of the microgrid during various operating conditions were observed to investigate the charging and discharging characteristics of the battery and the total harmonic distortion of the power network during grid-connected mode and islanded modes.