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Robust Secondary Controller for Islanded Microgrids with Unexpected Electrical Partitions under Fault Conditions

Author

Listed:
  • Evangelos E. Pompodakis

    (Institute of Energy, Environment and Climatic Change, Hellenic Mediterranean University, 714 10 Iraklio, Greece)

  • Georgios I. Orfanoudakis

    (School of Engineering, Power Systems and Energy Engineering, Hellenic Mediterranean University, 714 10 Heraklion, Greece)

  • Katsigiannis Yiannis

    (School of Engineering, Power Systems and Energy Engineering, Hellenic Mediterranean University, 714 10 Heraklion, Greece)

  • Emmanuel S. Karapidakis

    (School of Engineering, Power Systems and Energy Engineering, Hellenic Mediterranean University, 714 10 Heraklion, Greece)

Abstract

This paper proposes a sophisticated, fault-tolerant, and centralized secondary controller that is designed for inverter-based, islanded microgrids. The proposed controller enhances system resilience to unexpected network partitions, which typically occur due to the tripping of protective devices under fault conditions. In typical radially configured MGs, a line fault can cause protective devices to isolate the faulted line, thereby splitting the MG into two electrically independent sub-microgrids (SMGs), while retaining the existing communication and control framework. In contrast to traditional centralized and distributed secondary controllers, which often fail to restore the frequency to the nominal value (50 Hz) in split SMGs, the proposed controller exhibits exceptional performance. Through simulation studies on 6-bus and 13-bus islanded MG setups, the controller has not only demonstrated its ability to swiftly restore the nominal frequency in both SMGs within a few seconds (specifically 5 s), but also to ensure fair power distribution among the distributed generators (DGs) supplying the SMGs. This rapid frequency stabilization underscores the controller’s effectiveness in maintaining stable frequency levels immediately following a fault. In contrast, the use of traditional centralized and consensus controllers typically results in a frequency deviation of about 3 Hz from the nominal value in one of the SMGs during the microgrid’s partition.

Suggested Citation

  • Evangelos E. Pompodakis & Georgios I. Orfanoudakis & Katsigiannis Yiannis & Emmanuel S. Karapidakis, 2024. "Robust Secondary Controller for Islanded Microgrids with Unexpected Electrical Partitions under Fault Conditions," Energies, MDPI, vol. 17(15), pages 1-19, July.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:15:p:3727-:d:1444926
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    References listed on IDEAS

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    1. Jin, Peng & Li, Yang & Li, Guoqing & Chen, Zhe & Zhai, Xiaojuan, 2017. "Optimized hierarchical power oscillations control for distributed generation under unbalanced conditions," Applied Energy, Elsevier, vol. 194(C), pages 343-352.
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