Seamless Operation of Master-Slave Organized AC Microgrid with Robust Control and Islanding Detection

In this paper, islanding detection, control, power share, and grid synchronization techniques have been proposed for the seamless operation of AC Microgrid in Grid-Connected Mode (GCM), Islanded Mode (IM), and during the transition between both modes. The power share between Microgrid sources is implemented with a Master-Slave method. The control scheme of each source is designed with Robust Linear Quadratic Regulator (RLQR) and Mixed H2/H∞ Optimal (MO) controller. The detection algorithm is developed with Synchro-Extraction Transform (SET) and Optimal Support Vector Machine (OSVM). A Phase-Locked Loop (PLL) based grid synchronization method is also considered for the re-connecting of the Microgrid to the utility grid. To verify the practical feasibility, an experimental setup along dSPACE 1202 control kit is developed. For demonstrating the seamless operation of the proposed system, simulation and experimental results are presented.