The widespread use of small-scale generation sources in the last decades leads to a decentralized power supply to consumers in existing passive distribution networks. Such a transition becomes the basis for the emergence of the concept of active electrical networks based on which the MicroGrids are created, i.e., intelligent automated power supply systems. In such networks as well as in large power systems, it is impossible to exclude the occurrence of various emergency disturbances often leading to their division into parts. Nevertheless, the synchronization of MicroGrid objects after the collapse is difficult due to the stochastic nature of the load change and the low inertia of the power units. This chapter considers the methods, algorithms, and, in general, the technology for managing the MicroGrid synchronization with the external networks in a detailed manner. A method for controlling reclosers is proposed and investigated leading to decentralize auto-reconfiguration and automatic restoration of parallel operation of MicroGrid with an external network. An approach of smooth switching is introduced, where the equalization torque on the generator rotor is reduced by more than five times when the MicroGrid is connected to a parallel operation with an external network. Finally, an active synchronization technology is presented (without means of data transmission), which allows to synchronization of parts of an active network including MicroGrid, not only at nominal but also significantly different from nominal parameters. The obtained theoretical and simulation results are given and discussed in this chapter.