The world is observing a transition from its present centralized generation paradigm to a future with increased share of renewable energy sources (RES). Renewable energy sources (RES) based microgrids are seen as a solution to decrease reliance on depleting fossil fuel reserves provide an environment friendly solution to growing power demand. This paper put forwards a comprehensive review on controlling techniques. An overview of different control strategies of microgrid has been presented. The microgrids have been critically reviewed with respect to conventional and droop based control strategies. This paper presents a complete description, advantages and challenges of a microgrid and following a brief survey on the conventional voltage/frequency droop control, a generalized droop control (GDC) scheme and ANFIS control scheme. Finally, visualizing the wide scope of research in the micro grid; an attempt has been made to identify future research avenues.

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