Control of Photovoltaic‐Based Shunt Active Power Filter System Based on Optimal Operating Point Tracking of PV System for Harmonic Mitigation, Load Supply and Grid Current Injection

ABSTRACT This paper explores an innovative control strategy for photovoltaic‐based shunt active power filters (PV‐SAPF), aiming to enhance power quality, support load supply, and inject low‐harmonic current into the grid. Unlike existing approaches that rely solely on MPPT‐controlled inverters for optimal PV performance, this method integrates an optimal operating point tracking (OOPT) algorithm with a harmonic identification method (HIM), enabling comprehensive system functionality. The control scheme employs a HIM modules to generate reference currents, facilitating harmonic mitigation, reactive power compensation, and load support under varying energy production conditions. MATLAB/Simulink simulations demonstrate the effectiveness of this approach in maintaining grid stability during both energy surplus and deficit scenarios. When energy exceeds load demand, the PV‐SAPF supplies the load and injects less than 1% THD into the grid; during underproduction, it partially supplies the load and mitigates harmonics. The results adhere to IEEE Std 519‐2022 standards, showcasing the system's ability to improve power quality and grid harmony. Notably, this strategy differs from previous methods by removing the need for MPPT‐controlled converters and allowing compatibility with any harmonic identification technique, thus offering a versatile and efficient solution for integrating PV systems into the power grid.