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A Reduced Switch Seven Level Three phase UPQC for Voltage and Current Quality Enhancement in Distribution System
Veera Nagi Reddy Varampati , Venkata Reddy Kota , Ashok Kumar D.V
Abstract:   (238 Views)
 Power quality enhancement in modern distribution systems has become a critical challenge due to the proliferation of nonlinear loads and distributed generation. Unified Power Quality Conditioner (UPQC) systems offer a comprehensive solution by integrating series and shunt compensators to mitigate voltage and current disturbances. However, conventional UPQC topologies often involve a high number of switches, resulting in increased complexity, switching losses, and cost. This paper proposes a reduced switch seven-level three-phase UPQC configuration aimed at improving voltage regulation and current harmonic suppression while minimizing component count and system complexity. The proposed topology employs a control strategy such as Instantaneous Reactive power Theory (IRP) and Synchronous Reference Frame (SRF) theory to enhance dynamic performance. Simulation studies conducted in MATLAB/Simulink demonstrate significant improvements in Total Harmonic Distortion (THD), voltage sag/swell mitigation, and compliance with IEEE-519 standards. The findings validate the technical feasibility and effectiveness of the reduced-switch design in achieving superior power quality in distribution systems.
Keywords: Cascaded H-bridge, Seven level five switch converter, Power distribution system, Power quality, UPQC, Voltage quality, Current quality.
Full-Text [PDF 1969 kb]   (49 Downloads)    
Type of Study: Research Paper | Subject: Active and Reactive Power Converter Control
Received: 2025/06/17 | Revised: 2026/09/25 | Accepted: 2026/07/31
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Creative Commons License This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Creative Commons License
© 2022 by the authors. Licensee IUST, Tehran, Iran. This is an open access journal distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) license.