This paper objects to improve power quality in grid-connected photovoltaic (PV) system through development of an advanced Unified Power Flow Controller (UPFC) these participates dual control strategies with the multi-level inverter architecture. UPFC, the flexible and multifunctional power electronic device, addresses common current-related power quality issues including harmonic distortion, current imbalance, and transient disturbances by effectively managing power flow and compensating to reactive currents at a point of common coupling (PCC). Here, proposed control scheme employs sliding mode control (SMC) under steady-state conditions and switches to proportional resonance (PR) control during dynamic disturbances, enabling precise and responsive current regulation. In contrast to high-frequency inverters has the switching losses in high-power applications, an inclusion of MLI connected to UPFC design significantly reduces Total Harmonic Distortion and improves inclusive system efficiency. Here, system's efficiency is authenticated through simulations in a MATLAB/Simulink environment, since various working scenarios such as harmonic injection, unbalanced current conditions and transient events, and current swell. Simulation results establish the proposed UPFC configuration noticeably increases current and PCC, PV system’s output, and across grid interface. These findings highlight Voltage of UPFC, integrated with MLI, as robust and efficient solution to enhancing current regulation and overall quality power in PV grid-tied systems.
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