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A New Impedance-Based Main and Backup Protection Scheme for Active Distribution Lines in AC Microgrids

Author

Listed:
  • Seyyed Mohammad Nobakhti

    (Department of Electrical and Computer Engineering, University of Kashan, Kashan 8731753153, Iran)

  • Abbas Ketabi

    (Department of Electrical and Computer Engineering, University of Kashan, Kashan 8731753153, Iran)

  • Miadreza Shafie-khah

    (School of Technology and Innovations, University of Vaasa, 65200 Vaasa, Finland)

Abstract

Microgrids active characteristics such as grid-connected or islanded operation mode, the distributed generators with an intermittent nature, and bidirectional power flow in active distribution lines lead to malfunction of traditional protection schemes. In this article, an impedance-based fault detection scheme is proposed as the main protection of microgrids by applying the proposed equivalent circuits for doubly-fed lines. In this scheme, relay location data and positive sequence voltage absolute value of the other end of the line are used. It can detect even high impedance faults in grid-connected and islanded modes. It is robust against load and generation uncertainties and network reconfigurations. Low sampling rate and minimum data exchange are among the advantages of the proposed scheme. Moreover, a backup protection scheme based on the conductance variations is suggested. No requirement for the communication link is a distinguished advantage of the proposed backup protection scheme. The proposed schemes have been simulated using PSCAD and MATLAB software and the results confirmed their validity.

Suggested Citation

  • Seyyed Mohammad Nobakhti & Abbas Ketabi & Miadreza Shafie-khah, 2021. "A New Impedance-Based Main and Backup Protection Scheme for Active Distribution Lines in AC Microgrids," Energies, MDPI, vol. 14(2), pages 1-24, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:2:p:274-:d:475704
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    References listed on IDEAS

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    1. Mirsaeidi, Sohrab & Said, Dalila Mat & Mustafa, Mohd. Wazir & Habibuddin, Mohd. Hafiz & Ghaffari, Kimia, 2016. "Modeling and simulation of a communication-assisted digital protection scheme for micro-grids," Renewable and Sustainable Energy Reviews, Elsevier, vol. 57(C), pages 867-878.
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    Cited by:

    1. Mohammad Reza Shadi & Hamid Mirshekali & Rahman Dashti & Mohammad-Taghi Ameli & Hamid Reza Shaker, 2021. "A Parameter-Free Approach for Fault Section Detection on Distribution Networks Employing Gated Recurrent Unit," Energies, MDPI, vol. 14(19), pages 1-15, October.

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