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<p>Unified power quality conditioner (UPQC) is a multifunction custom power device designed to address power quality problems associated with both voltage and current in power distribution systems. This paper presents an eight-switch topology instead of traditional twelve-switch UPQC in an effort to reduce the number of switches to bring down the cost and estimated power losses that in turn increases the performance of the system. The proposed reduced-switch unified power quality conditioner is tested for numerous power quality issues using a nonlinear load, i.e. (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(3 - \varphi\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>3</mn> <mo>-</mo> <mi>φ</mi> </mrow> </math></EquationSource> </InlineEquation> diode bridge rectifier). In this paper, the proposed system integrates fuzzy logic controller and unit vector templates to further enhance the performance in terms of resolving the power quality problems. FLCs are used where precise mathematical calculations are tiresome. Unlike conventional fixed-gain PI controllers, the FLC adaptively regulates the system during rapid power exchange between series and shunt converters, improving transient response and harmonic mitigation. The proposed fuzzy logic controller-based reduced-switch UPQC model has been developed and simulated using MATLAB/Simulink and SimPowerSystems software. Experimental validation has been carried out using real-time digital simulator. Simulation and real-time results demonstrate effective voltage regulation, harmonic suppression within IEEE limits, unity power factor operation, and stable DC-link voltage under steady-state and transient conditions.</p>

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Fuzzy-Based Control Strategy for Three-Phase Reduced-Switch UPQC for Effective Mitigation of Power Quality Problems

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • Anha Farooq,
  • Abdul Hamid Bhat

摘要

Unified power quality conditioner (UPQC) is a multifunction custom power device designed to address power quality problems associated with both voltage and current in power distribution systems. This paper presents an eight-switch topology instead of traditional twelve-switch UPQC in an effort to reduce the number of switches to bring down the cost and estimated power losses that in turn increases the performance of the system. The proposed reduced-switch unified power quality conditioner is tested for numerous power quality issues using a nonlinear load, i.e. ( \(3 - \varphi\) 3 - φ diode bridge rectifier). In this paper, the proposed system integrates fuzzy logic controller and unit vector templates to further enhance the performance in terms of resolving the power quality problems. FLCs are used where precise mathematical calculations are tiresome. Unlike conventional fixed-gain PI controllers, the FLC adaptively regulates the system during rapid power exchange between series and shunt converters, improving transient response and harmonic mitigation. The proposed fuzzy logic controller-based reduced-switch UPQC model has been developed and simulated using MATLAB/Simulink and SimPowerSystems software. Experimental validation has been carried out using real-time digital simulator. Simulation and real-time results demonstrate effective voltage regulation, harmonic suppression within IEEE limits, unity power factor operation, and stable DC-link voltage under steady-state and transient conditions.