Stability analysis of parallel-inverters in microgrid

Renewable Energy is one of the fastest growing technologies. Renewable energy sources such as PV, wind and fuel cells are usually connected through voltage-source inverters to form a Microgrid. In order to share the same loads these inverters are connected in parallel. With the advances in network technology the control signals of the parallel inverters are exchanged through shared network. The time delay and the data loss may destabilize the system. In order to stabilize the parallel inverters a stability analysis should be carried out without considering the time delay. In this paper the stability of three-phase parallel inverters is analyzed to indentify the most effective control parameters on the system stability. The stability analysis in this study can be used as a guide for designing the controller in the case of time delay between the inverters controllers.