Enhanced the PQ of NI-Grid Connected to PV Systems Using a SAPF Controlled by the Predictive Controller

This paper presents a dual-stage grid-tied photovoltaic (PV) system designed to power a nonlinear load while simultaneously providing power factor correction on the AC mains using a shunt active power filter (SAPF). The system employs perturbation and observation control for maximum power point tracking (MPPT) from the PV generator, adapting to varying solar irradiance levels. On the grid side, a novel instantaneous active and reactive power (PQ) algorithm, utilizing a self-tuning filter (STF), extracts harmonic references even under non-ideal grid conditions. These references are used by an innovative predictive current control (PCC) strategy to generate the switching signals for a three-phase voltage source inverter (VSI). Additionally, a PI controller maintains the DC-link voltage of the SAPF at its reference value. The performance of the proposed system was evaluated under different conditions of grid harmonics, and unbalanced grid scenarios. Simulation findings indicate that the proposed PCC, coupled with the STF, performs effectively under these test conditions.