Control of Grid-Interactive Solar Based Microgrid with Seamless Synchronization to Grid/DG Set

The goal of this paper is to develop a grid-interactive solar PV (Photovoltaic) array based microgrid with seamless synchronization to grid/DG set. This paper deals with a single VSC (Voltage Source Converter), which is used to maintain the power quality of the microgrid and regulates its load voltage and frequency. The VSC control strategy is seamlessly switched the modes of microgrid from an islanded to the grid/DG (Diesel Generator) set connected mode, according to the power balance. An quadrature generalized integrator (QGI) based control of islanded/grid/DG set connected modes of the microgrid is presented, which improves the behavior of microgrid under nonlinear unbalanced load and unbalanced grid voltages condition. The robust automatic synchronization control unit has provided the seamless mode of switching and supply the uninterruptable power to the end-users. The microgrid control strategies are validated on MATLAB/Simulink. Moreover, the microgrid is tested on a hardware prototype under steady-state and dynamic conditions.