Improved control strategy for fuel cell and photovoltaic inverters in a microgrid

This paper presents an improved control strategy for parallel inverters so as to better manage power sharing among the distributed generation units in a microgrid. The proposed control strategy combines both power and voltage control schemes implemented on the voltage source inverters which are used as power electronics interface systems for conversion of power generated by fuel cell and photovoltaic generation units. Dynamic models of the fuel cell and photovoltaic systems available in the PSCAD/EMTDC simulation software are used as distributed generation units present in the microgrid. To evaluate the effectiveness of the developed control strategy, the microgrid is operated in grid connected, islanding and transition modes of operation. Key-Words: Distributed generation, microgrid, fuel cell, photovoltaic, inverter

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