Seamless Transitions between Grid-Connected and Stand-Alone Operations of Distributed Generation in Microgrids

Control of the Distributed Generation (DG) system is important in both grid-connected and stand- alone modes and the system stability becomes very crucial during the transfer between these two modes. If the system does not have a proper transfer procedure, severe transient voltages or currents will occur, which may damage the entire system. A seamless transfer can ensure smooth operation and quick attainment of steady state. In order to solve these transition problems, this paper presents the development and test of a control strategy for DG capable of working in grid-connected and intentional islanding connection modes with seamless transitions from both operational modes.

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