The research on grid-connected control method of microgrid

The control method of microgrid should be flexible due to its special operation modes and the differences of micro sources. Considering the coordinated control of micro sources in different operating modes and the smooth transition between the operating modes, an improved P-f and Q-V droop control method and the design method of controller are proposed in this paper. This method can realize the synchronous interconnection of microgrid and keep the output power of micro sources, which effectively reduce the impact to microgrid in the process of interconnection, and improve the stability and reliability of the system. The simulation results of operation characteristics in connected mode, island mode and the switch process of them verify the feasibility and effectiveness of the proposed control method.