The key target of this very literature to give a brief overview of overall control schemes used so far to control an entire microgrid system. The control schemes are classified according to their applications and operations. Brief descriptions of them are also provided. The overall control architecture is divided into four basic control levels, such as: tertiary, secondary, primary, and the last is internal control scheme. Trends and different strategies used so far, in above control levels are clearly showed in block diagrams to take a quick review.