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An Enhanced Control Strategy for Mitigation of State-Transition Oscillation Phenomena in Grid-Forming Self-Synchronized Converter System with Islanded Power System

Author

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  • Ki Ryong Kim

    (Power Conversion System Research Center, Smart Grid Research Division, Korea Electrotechnology Research Institute, Gwangju 61751, Korea)

  • Sangjung Lee

    (Power Conversion System Research Center, Smart Grid Research Division, Korea Electrotechnology Research Institute, Gwangju 61751, Korea)

  • Jong-Pil Lee

    (Power Conversion System Research Center, Smart Grid Research Division, Korea Electrotechnology Research Institute, Gwangju 61751, Korea)

  • Jaesik Kang

    (Power Conversion System Research Center, Smart Grid Research Division, Korea Electrotechnology Research Institute, Gwangju 61751, Korea)

Abstract

This paper proposes an enhanced control strategy for mitigating state-transition oscillations in active and reactive power responses of self-synchronized converter system to secure the islanded power system stability. The self-synchronized converter is well known for “grid-forming” that is able to operate to stand-alone mode (SAM) providing grid voltage and frequency without phase synchronization units. Although the grid-forming (GFM) is self-synchronized, the inherent synchronization principle causes system degradation in which should maintain a point of common coupling (PCC) voltage for critical loads as well as transitions from grid-connected mode (GCM) to SAM and vice versa. Therefore, this paper focuses on resolving the inherent oscillatory issues in GFM self-synchronized converter system (especially adopted ‘synchronverter’ principle), and proposes a control strategy for controllability improvement based on stability analysis for smooth state-transition under islanded power system. The efficacy of the proposed control method is verified through a high-fidelity electromagnetic transient (EMT) simulation with case studies on 30kW synchronverter system and further experimental hardware-in-loop system (HILS) test with Opal-RT (OP-5707) platform.

Suggested Citation

  • Ki Ryong Kim & Sangjung Lee & Jong-Pil Lee & Jaesik Kang, 2021. "An Enhanced Control Strategy for Mitigation of State-Transition Oscillation Phenomena in Grid-Forming Self-Synchronized Converter System with Islanded Power System," Energies, MDPI, vol. 14(24), pages 1-20, December.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:24:p:8453-:d:702623
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    References listed on IDEAS

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    1. Dreidy, Mohammad & Mokhlis, H. & Mekhilef, Saad, 2017. "Inertia response and frequency control techniques for renewable energy sources: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 69(C), pages 144-155.
    2. Ki-Ryong Kim & Chang-Yeol Oh & Tae-Jin Kim & Jong-Pil Lee & Hee-Je Kim, 2018. "Implementation of a Smart Power Conditioning System for Energy Storage System with a Novel Seamless Transfer Strategy," Energies, MDPI, vol. 11(5), pages 1-17, May.
    3. Fernández-Guillamón, Ana & Gómez-Lázaro, Emilio & Muljadi, Eduard & Molina-García, Ángel, 2019. "Power systems with high renewable energy sources: A review of inertia and frequency control strategies over time," Renewable and Sustainable Energy Reviews, Elsevier, vol. 115(C).
    4. Nikolay Nikolaev & Kiril Dimitrov & Yulian Rangelov, 2021. "A Comprehensive Review of Small-Signal Stability and Power Oscillation Damping through Photovoltaic Inverters," Energies, MDPI, vol. 14(21), pages 1-26, November.
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