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A Modified Self-Synchronized Synchronverter in Unbalanced Power Grids with Balanced Currents and Restrained Power Ripples

Author

Listed:
  • Xiaohe Wang

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

  • Liang Chen

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

  • Dan Sun

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

  • Li Zhang

    (State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems, China Electric Power Research Institute, Beijing 100192, China)

  • Heng Nian

    (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China)

Abstract

This paper proposes a modified self-synchronized synchronverter for unbalanced power grids. Small signal analysis of the conventional synchronverter shows that its stability margin around 50 Hz is very limited. Thus, power ripples will be caused at the frequency of 50 Hz. Filter- based current feeding loops are adopted in the conventional synchronverter in order to enhance its stability and eliminate power ripples. In addition, the characteristics of the conventional synchronverter in unbalanced power grids are analyzed, and an improved strategy using a resonant controller is proposed to restrain the current harmonics and power ripples. The parameter design is also studied for the proposed synchronverter. Experimental studies prove that the proposed strategy can achieve precise self-synchronization when the grid voltage is unbalanced, and the power-control performance is also improved significantly.

Suggested Citation

  • Xiaohe Wang & Liang Chen & Dan Sun & Li Zhang & Heng Nian, 2019. "A Modified Self-Synchronized Synchronverter in Unbalanced Power Grids with Balanced Currents and Restrained Power Ripples," Energies, MDPI, vol. 12(5), pages 1-18, March.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:5:p:923-:d:212577
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    References listed on IDEAS

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    1. Amin, Md. Ruhul & Aizam Zulkifli, Shamsul, 2017. "A framework for selection of grid-inverter synchronisation unit: Harmonics, phase-angle and frequency," Renewable and Sustainable Energy Reviews, Elsevier, vol. 78(C), pages 210-219.
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    Cited by:

    1. Fahad Alsokhiry & Grain Philip Adam, 2020. "Multi-Port DC-DC and DC-AC Converters for Large-Scale Integration of Renewable Power Generation," Sustainability, MDPI, vol. 12(20), pages 1-21, October.
    2. Efaf Bikdeli & Md. Rabiul Islam & Md. Moktadir Rahman & Kashem M. Muttaqi, 2022. "State of the Art of the Techniques for Grid Forming Inverters to Solve the Challenges of Renewable Rich Power Grids," Energies, MDPI, vol. 15(5), pages 1-25, March.
    3. Yunyang Xu & Heng Nian & Yangming Wang & Dan Sun, 2020. "Impedance Modeling and Stability Analysis of VSG Controlled Grid-Connected Converters with Cascaded Inner Control Loop," Energies, MDPI, vol. 13(19), pages 1-21, October.
    4. Teuvo Suntio & Tuomas Messo, 2019. "Power Electronics in Renewable Energy Systems," Energies, MDPI, vol. 12(10), pages 1-5, May.

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