A fuzzy control scheme for integration of DGs into a microgrid

In order to integrate different distributed generations (DGs) into a microgrid connected to a weak distribution grid, this paper proposes local controllers based in fuzzy logic. The integration of the DGs is achieved through the ≪plug and play≫ procedure. The understudy microgrid includes an hybrid fuel cell-battery system and a Doubly Fed Induction Generator (DFIG). Through the proposed controllers the DGs provide primary frequency control and local bus voltage support to the local grid in both cases either the microgrid operates in islanded mode or in connected mode when local disturbances occur. Using MATLAB/Simulink software the response of the system is recorded when the microgrid from the connected mode is transferred to the islanded operation and the system presents a good performance.