In order to conduct deep theoretical analysis of operating characteristics of microgrids， it is necessary to establish simulation models. By using MATLAB simulation tools， the models of the main micro-sources including photovoltaic arrays and proton exchange membrane fuel cells（PEMFC）are properly built， and with the integration of the model of a single phase grid-connected inverter with deadbeat control， a simple microgrid model is constructed. Simulation results prove the validity of the model.