A seamless mode transfer method for microgrid based on mode adaptive droop control

This paper proposed a novel seamless transfer strategy for micro grid between islanded mode and grid-connected mode. The structure of the micro grid and inverter are analyzed, and the control methods in islanded and gird-connected mode are both given. The droop control method is used in the inverter´s local control for power sharing, and the secondary control algorithm is designed for restore the frequency and amplitude deviations produced by the primary control. And a synchronization algorithm based on the secondary control is presented. Simulation results are presented to validate effectiveness of the proposed control method.