Simplified modeling procedure for inverter-based islanded microgrid

A methodology to model renewable energy inverter based microgrids is developed in this paper. Most of the renewable energy sources either produce DC directly (solar photovoltaics or fuel cells) or create DC before inversion to the utility (wind or hydroelectric turbines). The DC electric energy is first conditioned and then converted into the AC grid through an inverter. The proposed method models the dynamics of the DC and the AC sides of the inverters forming a microgrid. Equivalent circuit models for the both sides of the inverters are developed and power flow between them is represented by the dependent voltage and current sources. The effectiveness of the proposed modeling technique has been tested for transient and steady state conditions. Both simulations and experimental results verified the accuracy of the proposed modeling methodology.