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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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Copyright © 2025, This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC-BY-NY-SA). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Corresponding Author: KUPPIREDDY KRISHNA REDDY, krishnareddy206@mtieat.org N V KISHORE KUMAR, mtieteee207@gmail.com
Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.
Conflict of interest: The author declares that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
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