Control strategy research on low voltage microgrid

In order to avoid the switch of control strategies and achieve the smooth transition when operating modes change, the typical droop control based on P-f and Q-V characteristics was improved in this paper. And the parameter automatic adjustment was applied to reduce the voltage fluctuation caused by the power mismatch in the microgrid. At the same time, the method of grid synchronization control based on the positive feedback was analyzed to achieve microgrid reconnection to the power network while maintaining the output power of distribution generators (DGs). The simulation results of low voltage microgrid show that the proposed control methods speed up the voltage control when islanding occurs, complete the smooth reconnection of the microgrid and reduce the impact on the microgrid when operating mode changes.