A microgrid is a group of interconnected loads and distributed energy resources that acts as a single controllable entity with respect to the grid. It can connect and disconnect from the grid to operate in grid-connected or island mode. The control techniques used in the microgrid are as follows:
Centralized Control.
Decentralized Control.
Distributed Control.
Hierarchical Control.
Agent-Based Techniques for Distributed Control.
These links will you to understand well about the control techniques used for microgrids.