Microgrid control strategies and synchronization techniques during transition between grid-connected and stand-alone mode of operation

Phase detection schemes whit the purpose of Synchronization has been reviewed in this paper. These techniques include Phase-Locked Loop (PLL) methods such as the Single-Phase PLL (pPLL), Enhanced PLL (EPLL), Quadrature PLL (QPLL) and Synchronous Reference Frame PLL (SRF-PLL) and Adaptive Notch Filtering (ANF). The ANF is then modeled in Simulink and has been tested under distorted input signal and unbalanced loads in order to evaluate its performance in means of synchronization.