Implementation of M icro grid (MG) in power system is a current research topic. First because the multiple advantages presented against centralized networks, with regard to increased efficiency and control of faults. Second, the issues associated with their operation, management and technology implementation. Under correct operation, the MG must support and maintain all system variables within operational limits. In this article describe acting elements and how each of them contributes and supports the proper functioning of the MG, and some international experiences of real implementation of it.