Power Control of Parallel Inverters in Microgrid

Abstract

In Microgrid, inverters are connected in parallel to improve efficiency, increase transmission capacity, easily repair, maintain, and facilitate Microgrid structure change. However, in stand-alone mode the inverters must be controlled to power-sharing by the ratio of their rated power, because if the current supplied to the load is not be shared by the ratio of the rated power of the inverters, it will be a guide to an overload, or reactive current circulating in the inverters, which will lead to heating and even damage to the inverters. Therefore in this paper also introduces a power-sharing control method for parallel-connected inverters in the Microgrid. The proposed controller will perform the correct power sharing according to the rated power ratio of the inverters connected in parallel in Microgrid, this controller is not affected by line impedance and local loads under usual or where field cases communication bus combination is delayed or interrupted.