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Online Parametric Estimation of Grid Impedance Under Unbalanced Grid Conditions

Author

Listed:
  • Nabil Mohammed

    (School of Engineering, Macquarie University, Sydney, NSW 2109, Australia)

  • Mihai Ciobotaru

    (School of Engineering, Macquarie University, Sydney, NSW 2109, Australia)

  • Graham Town

    (School of Engineering, Macquarie University, Sydney, NSW 2109, Australia)

Abstract

Whereas power-electronics-based power systems are expected to enable more integration of renewable energy sources, they could pose crucial challenges including stability issues due to the Thévenin impedance seen by inverters. Such problems could be mitigated by enabling the inverters to estimate the grid impedance by including a grid impedance estimation technique into their control loop. However, one aspect which has been overlooked thus far is that the accuracy of such grid impedance estimation techniques is significantly affected by various grid conditions. For instance, the unbalance in three-phase power systems causes unwanted oscillations at double the fundamental frequency in the inverters control loops. Therefore, this paper proposes a simple and reliable online estimation of the grid impedance under unbalanced conditions. The technique is based on wide-band impedance estimation incorporated into the control loop of the positive sequence of a three-phase grid-connected inverter equipped with a positive- and negative-sequence control (PNSC) strategy. Additionally, complex curve fitting is utilized to obtain parametric models of the grid impedance. To demonstrate the efficacy of the proposed grid impedance estimation technique, extensive case studies are performed. These include: (1) unbalanced operations of both resistive-inductive (RL) and resistive-inductive-capacitive (RLC) models of the grid, (2) background harmonics, and (3) asymmetrical impedances of the network.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:24:p:4752-:d:297466
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    References listed on IDEAS

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    1. Wu Cao & Kangli Liu & Shunyu Wang & Haotian Kang & Dongchen Fan & Jianfeng Zhao, 2019. "Harmonic Stability Analysis for Multi-Parallel Inverter-Based Grid-Connected Renewable Power System Using Global Admittance," Energies, MDPI, vol. 12(14), pages 1-16, July.
    2. Ling Yang & Yandong Chen & An Luo & Kunshan Huai, 2019. "Admittance Reshaping Control Methods to Mitigate the Interactions between Inverters and Grid," Energies, MDPI, vol. 12(13), pages 1-18, June.
    3. 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.
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    Citations

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    Cited by:

    1. Mohammad Alathamneh & Haneen Ghanayem & Xingyu Yang & R. M. Nelms, 2022. "Three-Phase Grid-Connected Inverter Power Control under Unbalanced Grid Conditions Using a Time-Domain Symmetrical Components Extraction Method," Energies, MDPI, vol. 15(19), pages 1-16, September.
    2. Ali A. Radwan & Ahmed A. Zaki Diab & Abo-Hashima M. Elsayed & Hassan Haes Alhelou & Pierluigi Siano, 2020. "Active Distribution Network Modeling for Enhancing Sustainable Power System Performance; a Case Study in Egypt," Sustainability, MDPI, vol. 12(21), pages 1-22, October.
    3. Mohammad Alathamneh & Haneen Ghanayem & Xingyu Yang & R. M. Nelms, 2022. "Three-Phase Grid-Connected Inverter Power Control under Unbalanced Grid Conditions Using a Proportional-Resonant Control Method," Energies, MDPI, vol. 15(19), pages 1-17, September.
    4. Gabriel Nicolae Popa & Angela Iagăr & Corina Maria Diniș, 2020. "Considerations on Current and Voltage Unbalance of Nonlinear Loads in Residential and Educational Sectors," Energies, MDPI, vol. 14(1), pages 1-29, December.
    5. Mohammad Alathamneh & Haneen Ghanayem & R. M. Nelms, 2022. "Bidirectional Power Control for a Three-Phase Grid-Connected Inverter under Unbalanced Grid Conditions Using a Proportional-Resonant and a Modified Time-Domain Symmetrical Components Extraction Method," Energies, MDPI, vol. 15(24), pages 1-23, December.
    6. Martin Kanálik & Anastázia Margitová & Ľubomír Beňa & Andrea Kanáliková, 2020. "Power System Impedance Estimation Using a Fast Voltage and Current Changes Measurements," Energies, MDPI, vol. 14(1), pages 1-22, December.
    7. Azam Bagheri & Massimo Bongiorno & Irene Y. H. Gu & Jan R. Svensson, 2021. "Estimation of Frequency-Dependent Impedances in Power Grids by Deep LSTM Autoencoder and Random Forest," Energies, MDPI, vol. 14(13), pages 1-14, June.

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