Performance Evaluation of Single-Phase PV-BES Based Microgrid With Seamless Transition Capability

In this article, a single-phase solar photovoltaic (PV)-battery energy storage (BES) based microgrid is presented, which functions in grid-connected and islanded modes seamlessly. The PV-BES microgrid extracts the optimal power from the available solar energy and feeds the nonlinear loads through a load side voltage source converter. The maximum power from the solar PV array is extracted by controlling the boost converter connected between a PV array and the common dc link. A perturb and observe-based maximum power extraction technique is utilized for maximum power extraction. The BES is connected at the dc link. A control scheme is presented, which operates the system in grid connected as well as islanded modes. A multilayer modified second-order filter-based filtering technique is used to improve the power quality at the grid, while mitigating the harmonics from the grid current, as per the IEEE-519 standard.