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An Improved Directional Relay Adapted to a Distribution Network with IIG Integration

Author

Listed:
  • Yifan Zhu

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China)

  • Tao Zheng

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China)

  • Minghao Wang

    (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China)

  • Hongcheng Zhao

    (State Grid Tibet Electric Power Research Institute, Lhasa 850000, China)

  • Xingguo Wang

    (State Key Laboratory of Power Grid Safety and Energy Conservation, China Electric Power Research Institute Co., Ltd., Beijing 100192, China)

Abstract

The integration of distributed generation (DG) into a distribution network changes the network’s topology. Three-stage current protection for a radial distribution network cannot meet the requirements of relay protection for a distribution network with DG. A directional relay that is based on the positive sequence fault component (PSFC) can effectively identify faults in the positive and negative directions and can be used to solve the adaptability problem with three-stage current protection in a multi-source distribution network. However, DG and the traditional generators have different fault characteristics and are affected by different control strategies, which may lower the sensitivity of a directional relay based on the PSFC or even cause mal-operation. Focusing on this problem, this paper proposes an improved directional relay that is adapted to a distribution network with inverter-interfaced generation (IIG) integration. The improved scheme divides the operation zone of the directional relay based on the PSFC into sensitive and insensitive areas. If the result of a phase comparison is located in the insensitive area, further identification is needed according to a comparison of the current amplitudes. Simulation experiments are carried out based on PSCAD/EMTDC, and their results verify the correctness of the proposed scheme.

Suggested Citation

  • Yifan Zhu & Tao Zheng & Minghao Wang & Hongcheng Zhao & Xingguo Wang, 2019. "An Improved Directional Relay Adapted to a Distribution Network with IIG Integration," Energies, MDPI, vol. 12(17), pages 1-14, August.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:17:p:3345-:d:262354
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    References listed on IDEAS

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    1. Huiyuan Liu & Kehan Xu & Zhe Zhang & Wei Liu & Jianyong Ao, 2019. "Research on Theoretical Calculation Methods of Photovoltaic Power Short-Circuit Current and Influencing Factors of Its Fault Characteristics," Energies, MDPI, vol. 12(2), pages 1-21, January.
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    Cited by:

    1. Adriana Mar & Pedro Pereira & João F. Martins, 2019. "A Survey on Power Grid Faults and Their Origins: A Contribution to Improving Power Grid Resilience," Energies, MDPI, vol. 12(24), pages 1-21, December.
    2. José de Jesús Jaramillo Serna & Jesús M. López-Lezama, 2019. "Alternative Methodology to Calculate the Directional Characteristic Settings of Directional Overcurrent Relays in Transmission and Distribution Networks," Energies, MDPI, vol. 12(19), pages 1-25, October.

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