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A Modified SOGI-PLL with Adjustable Refiltering for Improved Stability and Reduced Response Time

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  • Gilberto A. Herrejón-Pintor

    (Tecnológico Nacional de México/Instituto Tecnológico de Morelia, Morelia 58120, Mexico
    Tecnológico Nacional de México/Instituto Tecnológico de Estudios Superiores de Zamora, Zamora de Hidalgo 59720, Mexico)

  • Enrique Melgoza-Vázquez

    (Tecnológico Nacional de México/Instituto Tecnológico de Morelia, Morelia 58120, Mexico)

  • Jose de Jesús Chávez

    (Tecnológico Nacional de México/Instituto Tecnológico de Morelia, Morelia 58120, Mexico
    Faculty of Electrical Engineering, Mathematics and Computer Science, Delft University of Technology, 2628 CD Delft, The Netherlands)

Abstract

The controls of most power electronic inverters connected to an electrical power system (EPS) rely on the precise determination of the voltage magnitude, frequency, and phase angle at the point of common coupling. One of the most widely used approaches for measuring these quantities is the phase-locked loop (PLL); however, the precision of this measurement is affected during transients in the EPS and is a function of the type of event and the architecture of the PLL. PLLs based on the second-order generalized integrator (SOGI) are widely used in power converter synchronization, offering an adaptive or fixed-parameter prefilter with low-pass and band-pass characteristics. This article proposes a variant of the SOGI-PLL that offers improved stability and a faster response time. This is accomplished by decoupling the effect of the SOGI’s gains and adding feedback. The modification is carried out in the state space model of the SOGI. Manipulating the attenuation moves the poles of the SOGI to improve the stability. The performance of the proposed PLL is verified and validated under the processor-in-the-loop (PIL) approach.

Suggested Citation

  • Gilberto A. Herrejón-Pintor & Enrique Melgoza-Vázquez & Jose de Jesús Chávez, 2022. "A Modified SOGI-PLL with Adjustable Refiltering for Improved Stability and Reduced Response Time," Energies, MDPI, vol. 15(12), pages 1-20, June.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:12:p:4253-:d:835150
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    References listed on IDEAS

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    1. Roni Luhtala & Henrik Alenius & Tomi Roinila, 2020. "Practical Implementation of Adaptive SRF-PLL for Three-Phase Inverters Based on Sensitivity Function and Real-Time Grid-Impedance Measurements," Energies, MDPI, vol. 13(5), pages 1-18, March.
    2. Yijia Cao & Jiaqi Yu & Yong Xu & Yong Li & Jingrong Yu, 2017. "An Efficient Phase-Locked Loop for Distorted Three-Phase Systems," Energies, MDPI, vol. 10(3), pages 1-16, February.
    3. Bashar Aldbaiat & Mutasim Nour & Eyad Radwan & Emad Awada, 2022. "Grid-Connected PV System with Reactive Power Management and an Optimized SRF-PLL Using Genetic Algorithm," Energies, MDPI, vol. 15(6), pages 1-21, March.
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