Robust Control System Tuner and Cascaded Adaptive Vectorial Filter-Based PV-Battery System With a Dual-Loop ANF-PLL

This article presents a three-phase, single-stage photovoltaic (PV) system with a battery energy storage (BES) that functions in both grid-tied and islanded modes. In grid-tied mode, dual-mode PV-battery system (DPBS) provides functionalities such as reactive power compensation, enhanced power quality (PQ), and feeding PV power to utility. On grid loss, it acts as an uninterrupted supply and maintains load voltage. To provide above features, a dual-mode controller is designed with cascaded adaptive vectorial filter control along with maximum power point tracking (MPPT) in grid-tied mode and voltage control in islanded mode. Moreover, a robust dual-loop adaptive notch filter-based phase-locked loop (PLL) with a hybrid islanding detection mechanism monitors grid and coordinates grid re/connection and isolation, adhering to IEEE 1547-2018 revised standard. A laboratory prototype of DPBS has operated successfully in different test scenarios.