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Seamless Transfer Algorithm of AC Microgrid Inverter Compensating Load Current for Weak Grid

Author

Listed:
  • Jae-Uk Lim

    (Department of Control and Instrumentation Engineering, Korea University of Transportation, Chungju (KS001) 27469, Korea)

  • Il-seob Kwon

    (Department of Control and Instrumentation Engineering, Korea University of Transportation, Chungju (KS001) 27469, Korea)

  • Hag-Wone Kim

    (Department of Control and Instrumentation Engineering, Korea University of Transportation, Chungju (KS001) 27469, Korea)

  • Kwan-Yuhl Cho

    (Department of Control and Instrumentation Engineering, Korea University of Transportation, Chungju (KS001) 27469, Korea)

Abstract

In this paper, we propose a voltage control technique for the seamless transfer algorithm of a microgrid inverter. When the microgrid inverter is switched from grid-connected mode to standalone operation mode, an output voltage transient may occur, and adversely affect the load. To solve this, seamless transfer algorithms that complete mode switching within 4 ms have been studied. However, previous control techniques have very complex structures. In this study, we find the cause of the voltage transient occurring in the mode conversion, through state average modeling of the inverter. Subsequently, we propose a feed-forward compensator for seamless transfer. The cause of the voltage transient is removed by the compensation, and smooth mode switching is achieved. The proposed controller is verified by Powersim (PSIM) simulations.

Suggested Citation

  • Jae-Uk Lim & Il-seob Kwon & Hag-Wone Kim & Kwan-Yuhl Cho, 2019. "Seamless Transfer Algorithm of AC Microgrid Inverter Compensating Load Current for Weak Grid," Energies, MDPI, vol. 12(4), pages 1-15, February.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:4:p:728-:d:208231
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    References listed on IDEAS

    as
    1. Kyungbae Lim & Jaeho Choi, 2017. "Seamless Grid Synchronization of a Proportional+Resonant Control-Based Voltage Controller Considering Non-Linear Loads under Islanded Mode," Energies, MDPI, vol. 10(10), pages 1-22, September.
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    Cited by:

    1. Ali Aillane & Karim Dahech & Larbi Chrifi-Alaoui & Aissa Chouder & Tarak Damak & Abdelhak Hadjkaddour & Pascal Bussy, 2023. "The Design and Processor-In-The-Loop Implementation of a Super-Twisting Control Algorithm Based on a Luenberger Observer for a Seamless Transition between Grid-Connected and Stand-Alone Modes in Micro," Energies, MDPI, vol. 16(9), pages 1-22, May.

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