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Power Quality Improvement through a UPQC and a Resonant Observer-Based MIMO Control Strategy

Author

Listed:
  • Holman Bueno-Contreras

    (Department of Electrical and Electronic Engineering, Universidad Nacional de Colombia, Bogotá 111321, Colombia)

  • Germán Andrés Ramos

    (Department of Electrical and Electronic Engineering, Universidad Nacional de Colombia, Bogotá 111321, Colombia)

  • Ramon Costa-Castelló

    (Departament d’Enginyeria de Sistemes, Automàtica i Informàtica Industrial, Universitat Politècnica de Catalunya (UPC), 08028 Barcelona, Spain)

Abstract

Performance degradation is, in general, regarded as a power quality problem. One solution to recover grid performance is through the application of a unified power quality conditioner (UPQC). Although these devices are multi-input/multi-output (MIMO) systems, the most common control strategies consist of two decoupled controllers, which neglect the coupling effects and add uncertainty to the system. For this reason, this paper proposes a multivariable resonant observer-based control strategy of a UPQC system. This method includes all significant coupling effects between this system and the grid. This strategy results in a stability-based compensator, which differs from recently proposed strategies that are based on signal calculation and cannot assure closed-loop stability. In addition, this paper introduces a simplified controller tuning strategy based on optimal conventional methods without losing closed-loop performance. It implies that the controller can be easily tuned, despite the complexity of the MIMO dynamic model. The UPQC with the resonant observer is verified on an experimental setup for a single-phase system, obtaining three relevant results for power quality improvement: (1) harmonics compensation tested with a total harmonic distortion limit of 5%; (2) sags and swells mitigation; and (3) power factor correction, achieving a unitary value on the grid side.

Suggested Citation

  • Holman Bueno-Contreras & Germán Andrés Ramos & Ramon Costa-Castelló, 2021. "Power Quality Improvement through a UPQC and a Resonant Observer-Based MIMO Control Strategy," Energies, MDPI, vol. 14(21), pages 1-21, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:6938-:d:662048
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    References listed on IDEAS

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    1. Dung Vo Tien & Radomir Gono & Zbigniew Leonowicz, 2018. "A Multifunctional Dynamic Voltage Restorer for Power Quality Improvement," Energies, MDPI, vol. 11(6), pages 1-17, May.
    2. G. A. Ramos & Ramon Costa-Castelló & John Cortés-Romero, 2015. "LPV Observer-Based Strategy for Rejection of Periodic Disturbances with Time-Varying Frequency," Mathematical Problems in Engineering, Hindawi, vol. 2015, pages 1-9, May.
    3. Ali Moghassemi & Sanjeevikumar Padmanaban, 2020. "Dynamic Voltage Restorer (DVR): A Comprehensive Review of Topologies, Power Converters, Control Methods, and Modified Configurations," Energies, MDPI, vol. 13(16), pages 1-38, August.
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    Cited by:

    1. Dheyaa Ied Mahdi & Goksu Gorel, 2022. "Design and Control of Three-Phase Power System with Wind Power Using Unified Power Quality Conditioner," Energies, MDPI, vol. 15(19), pages 1-21, September.

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