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A Compensation Control Scheme of Voltage Unbalance Using a Combined Three-Phase Inverter in an Islanded Microgrid

Author

Listed:
  • Biying Ren

    (Department of Electronical Engineering, Xi’an University of Technology, Xi’an 710048, China)

  • Xiangdong Sun

    (Department of Electronical Engineering, Xi’an University of Technology, Xi’an 710048, China)

  • Shasha Chen

    (Department of Electronical Engineering, Xi’an University of Technology, Xi’an 710048, China)

  • Huan Liu

    (Department of Electronical Engineering, Xi’an University of Technology, Xi’an 710048, China)

Abstract

A large number of single-phase loads in an islanded microgrid have a bad influence on the alternating current (AC) bus voltage symmetry, which will further impact the power supply for the other loads. In this paper, the combined three-phase inverter is adopted as the distributed generation (DG) interface circuit for its independent control of each bridge. However, the combined three-phase inverter will generate an asymmetrical voltage with the traditional droop control. Moreover, the system impedance also effects the voltage symmetry. Therefore, the improved droop control method based on the self-adjusting P - f and Q - U droop curves and the system impedance voltage drop compensation are proposed. The system control scheme is also designed in detail. A simulation and an experiment under the conditions of the balanced, unbalanced loads are carried out, and the results verify the feasibility and effectiveness of the control strategy.

Suggested Citation

  • Biying Ren & Xiangdong Sun & Shasha Chen & Huan Liu, 2018. "A Compensation Control Scheme of Voltage Unbalance Using a Combined Three-Phase Inverter in an Islanded Microgrid," Energies, MDPI, vol. 11(9), pages 1-15, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2486-:d:170675
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    References listed on IDEAS

    as
    1. Dawoud, Samir M. & Lin, Xiangning & Okba, Merfat I., 2018. "Hybrid renewable microgrid optimization techniques: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 82(P3), pages 2039-2052.
    2. Ting-Chia Ou & Kai-Hung Lu & Chiou-Jye Huang, 2017. "Improvement of Transient Stability in a Hybrid Power Multi-System Using a Designed NIDC (Novel Intelligent Damping Controller)," Energies, MDPI, vol. 10(4), pages 1-16, April.
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    Citations

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    Cited by:

    1. Gianfranco Chicco & Andrea Mazza, 2019. "100 Years of Symmetrical Components," Energies, MDPI, vol. 12(3), pages 1-20, January.
    2. Hyun Shin & Sang Heon Chae & Eel-Hwan Kim, 2021. "Unbalanced Current Reduction Method of Microgrid Based on Power Conversion System Operation," Energies, MDPI, vol. 14(13), pages 1-16, June.
    3. Monica Purushotham & Kowsalya Muniswamy, 2019. "Reinforced Droop for Active Current Sharing in Parallel NPC Inverter for Islanded AC Microgrid Application," Energies, MDPI, vol. 12(16), pages 1-27, August.
    4. Bilal Naji Alhasnawi & Basil H. Jasim & Walid Issa & Amjad Anvari-Moghaddam & Frede Blaabjerg, 2020. "A New Robust Control Strategy for Parallel Operated Inverters in Green Energy Applications," Energies, MDPI, vol. 13(13), pages 1-31, July.
    5. Daisuke Iioka & Takahiro Fujii & Toshio Tanaka & Tsuyoshi Harimoto & Junpei Motoyama & Daisuke Nagae, 2021. "Improvement of Voltage Unbalance by Current Injection Based on Unbalanced Line Impedance in Distribution Network with PV System," Energies, MDPI, vol. 14(23), pages 1-16, December.

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