Optimization in control method of microgrids attracted a great deal of attention of many researchers nowadays. In obtaining a robust controller that is capable in improving the quality of load power sharing and reducing losses thus increasing the performance and reliability of microgrids especially in islanded mode, droop based method is seem to be a popular option in many ways. The optimization methods justify the level of performance of a microgrid by enabling a robust control in controlling active and reactive power in ensuring stability, voltage regulation, as well as prevent the occurrence of circulating current. This paper strives to bring to light the review of control strategies involved in parallel connected inverters, obstruction in implementing droop method, and which optimization approaches were applied to empower the microgrid. An overview control strategy in islanded microgrid is also presented.
