Smooth Switching Control Strategy For Microgrid Based On State Following Controller

In the low-voltage microgrid, due to currentshock and DC-side voltage fluctuations during on-grid or off-grid switching, a smooth switching control strategy based on state-following controller for microgrid is proposed in this paper. An improved pre-synchronization control is researched when dual-mode control at switching on-grid and off-grid is used for microgrid. At the same time, designed as a negative feedback, the output of the PQ controller or droop controller is input of the other controller to form two different smooth switching control methods with synchronous following. Simulation experiments verify the effectiveness that the proposed method can effectively suppress instantaneous current and voltage impact of the on-grid and off-grid switching, and ensure the smooth switching of microgrid operation.