Microgrid control system based on an Adaptive Notch Filter power processor

Localization of the distributed sources is not free of challenges and there are many concerns regarding microgrids control systems and their reliable operation. Microgrids could operate in both stand-alone and grid-connected modes of operation. Their control systems must maintain voltages at the rated frequency, while they ensure power sharing among units along with providing synchronization requirements for a smooth transition between modes of operation. In this paper a control system is proposed consisting of a power signal processor synchronizer based on an Adaptive Notch Filter (ANF). The proposed PLL-less control system is modeled in Simulink/MATLAB and is examined on an islanded microgrid in abnormal circumstances such as in fixing voltages and frequencies when balanced and specially unbalanced loads are connected to the system and also during transitioning of the microgrid to the grid-connected mode.