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Volume 13 | Issue 6 | Year 2026 | Article Id. IJECE-V13I6P109 | DOI : https://doi.org/10.14445/23488549/IJECE-V13I6P109

High-Power-Density Matrix-Converter UPQC for Bidirectional Power Quality Conditioning in Renewable-Integrated Microgrids

Naveen G, Sangamesh G Sakri

Received Revised Accepted Published
11 Mar 2026 09 Apr 2026 08 May 2026 27 Jun 2026

Citation :

Naveen G, Sangamesh G Sakri, "High-Power-Density Matrix-Converter UPQC for Bidirectional Power Quality Conditioning in Renewable-Integrated Microgrids," International Journal of Electronics and Communication Engineering, vol. 13, no. 6, pp. 112-123, 2026. Crossref, https://doi.org/10.14445/23488549/IJECE-V13I6P109

Abstract

Power quality degradation in renewable-integrated microgrids remains a persistent concern as photovoltaic generation variability and nonlinear loading conditions introduce simultaneous harmonic distortion, voltage sag, swell, and unbalance that conventional compensation arrangements struggle to address within a single unified framework. Existing solutions based on the Voltage Source Inverter Unified Power Quality Conditioner (VSI-UPQC) and Active Power Filter (APF) topologies rely on electrolytic Direct Current (DC) link capacitor banks that introduce reliability limitations, increase passive component volume, and reduce full-load conversion efficiency under bidirectional battery operation. This paper presents a capacitorless Matrix Converter-Based Unified Power Quality Conditioner (MC-UPQC) employing Direct Quadrature (dq) frame control with Phase-Locked Loop (PLL) synchronisation and adaptive gain tuning to provide simultaneous series and shunt compensation in a three-phase four-wire (3ϕ-4W) microgrid. Measured solar irradiance data drawn from the National Renewable Energy Laboratory National Solar Radiation Database (NREL NSRDB), comprising Global Horizontal Irradiance (GHI), Direct Normal Irradiance (DNI), diffuse horizontal irradiance (DHI), and ambient temperature sampled over an eight-day window, was used to drive a 50 kW Photovoltaic (PV) generation profile across six disturbance scenarios evaluated in a MATLAB/Simulink R2023b environment using the Simscape Electrical toolbox. Simulation results show that the proposed MC-UPQC reduced source current Total Harmonic Distortion (THD) from 18.4% to 2.1%, lowered voltage unbalance factor (VUF) from 3.0% to 0.5%, restored Point of Common Coupling (PCC) voltage within 12 ms with a regulation error of 0.01 pu, and achieved 97.1% full-load efficiency with a power density of 2.4 kW/L, outperforming APF-only and conventional VSI-UPQC baselines.

Keywords

Matrix Converter, Unified Power Quality Conditioner, Microgrid Power Quality, Harmonic Mitigation, Voltage Sag Compensation, Bidirectional Power Flow, Adaptive Control.

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