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A Comprehensive Digital Protection Scheme for Low-inertia Microgrids Considering High Penetration of Renewables

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Renewable Power Systems Dynamic Security

Part of the book series: Power Systems ((POWSYS))

Abstract

This chapter provides a digital scheme of frequency control and over/underfrequency relay (OUFR) protection for an islanded microgrid (μG) considering high penetration of renewable energy sources (RESs). Reducing system inertia by replacing synchronous generators with a large amount of RESs causes undesirable influence on system frequency stability, leading to weakening of the μG. In addition, sudden changes in load and short circuits cause large frequency fluctuations that threaten the system security. Therefore, this chapter proposes a coordination scheme between the digital frequency controller, which is designed based on Tustin’s technique, and the digital OUFR, which operates for both conditions of over- and underfrequency, to protect the power system against high frequency variations. To evaluate the effectiveness of the proposed digital coordination scheme, the simulation results of the studied islanded μG are executed by MATLAB software. Thus, the obtained results emphasized that the proposed coordination scheme can effectively handle several disturbances and high system uncertainty. Moreover, it can regulate the μG frequency and guarantee robust performance to maintain the dynamic security of low-inertia islanded μG.

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Authors and Affiliations

  1. Electrical Engineering Department, Faculty of Energy Engineering, Aswan University, Aswan, Egypt

    Gaber Magdy & Gaber Shabib

  2. Electrical Engineering Department, Faculty of Engineering, Minia University, El-Minia, Egypt

    Adel A. Elbaset

  3. Electrical Engineering Department, Kyushu Institute of Technology, Tobata-ku, Kitakyushu-shi, Fukuoka, Japan

    Yasunori Mitani

Authors
  1. Gaber Magdy
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  2. Gaber Shabib
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  3. Adel A. Elbaset
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  4. Yasunori Mitani
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Magdy, G., Shabib, G., Elbaset, A.A., Mitani, Y. (2020). A Comprehensive Digital Protection Scheme for Low-inertia Microgrids Considering High Penetration of Renewables. In: Renewable Power Systems Dynamic Security. Power Systems. Springer, Cham. https://doi.org/10.1007/978-3-030-33455-0_3

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  • DOI: https://doi.org/10.1007/978-3-030-33455-0_3

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-33454-3

  • Online ISBN: 978-3-030-33455-0

  • eBook Packages: EnergyEnergy (R0)

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