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Interlink Converter with Linear Quadratic Regulator Based Current Control for Hybrid AC/DC Microgrid

Author

Listed:
  • Dwi Riana Aryani

    (Department of Electrical and Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea)

  • Jung-Su Kim

    (Department of Electrical and Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea)

  • Hwachang Song

    (Department of Electrical and Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea)

Abstract

A hybrid alternate current/direct current (AC/DC) microgrid consists of an AC subgrid and a DC subgrid, and the subgrids are connected through the interlink bidirectional AC/DC converter. In the stand-alone operation mode, it is desirable that the interlink bidirectional AC/DC converter manages proportional power sharing between the subgrids by transferring power from the under-loaded subgrid to the over-loaded one. In terms of system security, the interlink bidirectional AC/DC converter takes an important role, so proper control strategies need to be established. In addition, it is assumed that a battery energy storage system is installed in one subgrid, and the coordinated control of interlink bidirectional AC/DC converter and battery energy storage system converter is required so that the power sharing scheme between subgrids becomes more efficient. For the purpose of designing a tracking controller for the power sharing by interlink bidirectional AC/DC converter in a hybrid AC/DC microgrid, a droop control method generates a power reference for interlink bidirectional AC/DC converter based on the deviation of the system frequency and voltages first and then interlink bidirectional AC/DC converter needs to transfer the power reference to the over-loaded subgrid. For efficiency of this power transferring, a linear quadratic regulator with exponential weighting for the current regulation of interlink bidirectional AC/DC converter is designed in such a way that the resulting microgrid can operate robustly against various uncertainties and the power sharing is carried out quickly. Simulation results show that the proposed interlink bidirectional AC/DC converter control strategy provides robust and efficient power sharing scheme between the subgrids without deteriorating the secure system operation.

Suggested Citation

  • Dwi Riana Aryani & Jung-Su Kim & Hwachang Song, 2017. "Interlink Converter with Linear Quadratic Regulator Based Current Control for Hybrid AC/DC Microgrid," Energies, MDPI, vol. 10(11), pages 1-26, November.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:11:p:1799-:d:118110
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    References listed on IDEAS

    as
    1. Dwi Riana Aryani & Hwachang Song, 2016. "Coordination Control Strategy for AC/DC Hybrid Microgrids in Stand-Alone Mode," Energies, MDPI, vol. 9(6), pages 1-20, June.
    2. Kuznetsova, Elizaveta & Li, Yan-Fu & Ruiz, Carlos & Zio, Enrico, 2014. "An integrated framework of agent-based modelling and robust optimization for microgrid energy management," Applied Energy, Elsevier, vol. 129(C), pages 70-88.
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    Cited by:

    1. Robert Antonio Salas-Puente & Silvia Marzal & Raúl González-Medina & Emilio Figueres & Gabriel Garcera, 2018. "Power Management of the DC Bus Connected Converters in a Hybrid AC/DC Microgrid Tied to the Main Grid," Energies, MDPI, vol. 11(4), pages 1-22, March.
    2. Zeyan Lv & Yanghong Xia & Junwei Chai & Miao Yu & Wei Wei, 2018. "Distributed Coordination Control Based on State-of-Charge for Bidirectional Power Converters in a Hybrid AC/DC Microgrid," Energies, MDPI, vol. 11(4), pages 1-15, April.
    3. Ismi Rosyiana Fitri & Jung-Su Kim & Hwachang Song, 2018. "A Robust Suboptimal Current Control of an Interlink Converter for a Hybrid AC/DC Microgrid," Energies, MDPI, vol. 11(6), pages 1-15, May.

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