Abstract
Microgrids are becoming inevitable establishments in modern power systems, may be to address energy needs in remote locations or to improve resiliency or for any other reason in the smart grid scenario. Over the time, during different operating scenarios, these microgrids need to be interconnected with another microgrid or with the main grid which is a challenging task. In this connection, this paper investigates the necessity of following the synchronization protocol and the flexibility one can have when interconnecting different microgrids with inverter and rotating machine based systems, as well as homogeneous and heterogeneous sources. In addition, a simple controller is proposed to have seamless, quick and stable interconnections when the microgrids consist of rotating machines.