Hybrid Control of Flying Capacitor Converter Based Shunt Active Power Filter for Photovoltaic Systems Interconnection

This work deals with the hybrid control of grid-connected photovoltaic (PV) systems with the ability of active power filtering in the highly distorted power grid. The used interfacing system consists of a multilevel topology that provides better performances in terms of power quality improvement compared to the two-level counterpart, especially for single-stage PV systems. The proposed control process consists of a cascaded structure to deal with the following objectives: (i) extract the maximum power from the PV panels despite the climate changes, (ii) equal sharing of the input voltage over the power switching devices, (iii) satisfactory compensation of harmonic currents and reactive power. To meet these objectives, two cascaded loops are designed, an outer voltage loop based on a PI regulator for PV panels voltage regulation and an inner loop developed using a hybrid automaton to deal with power factor correction (PFC) and flying capacitors voltage balancing. The investigated system is simulated using Matlab/SimpowerSystems environment and Stateflow toolbox, the obtained results prove the good performance of the proposed control approach. Copyright (C) 2022 The Authors.