Single-Stage 3-ɸ Grid Synchronization with BES System

This paper demonstrates a distributed generated system (DGS) based on the integration of a single-stage solar photovoltaic (PV) with a battery energy support (BES). The DGS consists of a battery storage support, solar PV array generation, multifunctional voltage source converters (VSC), and local loads. Moreover, the DGS feeds the loads in grid-connected mode (GCM) and islanded mode (IM). Due to the grid failure, the system operates in IM by itself-without affecting the loads. Correspondingly, it automatically turns towards the GCM due to restoring of the grid. Here, two multifunctional VSCs are used in the DGS, one for power quality improvement and another is used for efficient power management. To extract the maximum power (MP) from the solar PV array, a perturb & observe (P& O) algorithm is used in both GCM and IM. In GCM, a fast control algorithm is used to evaluate the fundamental weight component (FWC), which eliminates the grid currents harmonics at balanced/unbalanced load conditions.