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Identification of Three-Phase Grid Impedance in the Presence of Parallel Converters

Author

Listed:
  • Roni Luhtala

    (Department of Electrical Energy Engineering, Tampere University, 33720 Tampere, Finland)

  • Tuomas Messo

    (Department of Electrical Energy Engineering, Tampere University, 33720 Tampere, Finland)

  • Tomi Roinila

    (Department of Electrical Energy Engineering, Tampere University, 33720 Tampere, Finland)

  • Henrik Alenius

    (Department of Electrical Energy Engineering, Tampere University, 33720 Tampere, Finland)

  • Erik de Jong

    (Department of Electrical Engineering, Eindhoven University of Technology, 5600 Eindhoven, The Netherlands)

  • Andrew Burstein

    (DNV-GL, 6812 Arnhem, The Netherlands)

  • Alejandra Fabian

    (DNV-GL, 6812 Arnhem, The Netherlands)

Abstract

Grid impedance is an important parameter which affects the control performance of grid-connected power converters. Several methods already exist for optimizing the converter control system based on knowledge of grid impedance value. Grid impedance may change rapidly due to fault or disconnection of a transmission line. Therefore, online grid identification methods have been recently proposed to have up-to-date information about the grid impedance value. This is usually done by perturbing the converter output current and measuring the response in output voltage. However, any parallel converters connected to the same interface point will cause errors, since the measured current differs from the current that is flowing through the grid interface point. This paper points out challenges and errors in grid impedance identification, caused by parallel converters and their internal control functions, such as grid-voltage support. Experimental grid-impedance measurements are shown from the power hardware-in-the-loop setup developed at DNV-GL Flexible Power Grid Lab.

Suggested Citation

  • Roni Luhtala & Tuomas Messo & Tomi Roinila & Henrik Alenius & Erik de Jong & Andrew Burstein & Alejandra Fabian, 2019. "Identification of Three-Phase Grid Impedance in the Presence of Parallel Converters," Energies, MDPI, vol. 12(14), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:14:p:2674-:d:247735
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    References listed on IDEAS

    as
    1. Tuomas Messo & Roni Luhtala & Tomi Roinila & Erik de Jong & Rick Scharrenberg & Tommaso Caldognetto & Paolo Mattavelli & Yin Sun & Alejandra Fabian, 2019. "Using High-Bandwidth Voltage Amplifier to Emulate Grid-Following Inverter for AC Microgrid Dynamics Studies," Energies, MDPI, vol. 12(3), pages 1-18, January.
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    Citations

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    Cited by:

    1. Roni Luhtala & Henrik Alenius & Tomi Roinila, 2020. "Practical Implementation of Adaptive SRF-PLL for Three-Phase Inverters Based on Sensitivity Function and Real-Time Grid-Impedance Measurements," Energies, MDPI, vol. 13(5), pages 1-18, March.
    2. Himadry Shekhar Das & Shuhui Li & Shahinur Rahman, 2023. "Grid Interconnection Modeling of Inverter Based Resources (IBR) Plant for Transient Analysis," Energies, MDPI, vol. 16(7), pages 1-20, April.
    3. Ishita Ray, 2021. "Review of Impedance-Based Analysis Methods Applied to Grid-Forming Inverters in Inverter-Dominated Grids," Energies, MDPI, vol. 14(9), pages 1-18, May.
    4. Antonio T. Alexandridis, 2020. "Modern Power System Dynamics, Stability and Control," Energies, MDPI, vol. 13(15), pages 1-8, July.
    5. Nabil Mohammed & Mihai Ciobotaru & Graham Town, 2019. "Online Parametric Estimation of Grid Impedance Under Unbalanced Grid Conditions," Energies, MDPI, vol. 12(24), pages 1-21, December.

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