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An Anti-Islanding Protection Method Based on Voltage-Synchronous Impedance Angle Measurements

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  • Fan Yang

    (Electric Power Research Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China)

  • Yang Lei

    (Electric Power Research Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China)

  • Hechong Chen

    (Electric Power Research Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China)

  • Zhichun Yang

    (Electric Power Research Institute of State Grid Hubei Electric Power Co., Ltd., Wuhan 430077, China)

  • Huabo Xu

    (College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China)

  • Heng Chen

    (College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
    Shandong Kehui Electric Power Automation Co., Ltd., Zibo 255087, China)

  • Yu Chen

    (College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China)

Abstract

Grid-tied distributed generators (DGs) need to be equipped with anti-islanding protection to avoid the impact of unplanned islanding, which would affect system stability, auto-reclosing, and personal safety. Among the active anti-islanding protections, impedance measurements based on signal injection have the advantages of a low non-detection zone (NDZ) and are less prone to maloperation during grid disturbances; however, there are problems with signal interference in multi-DG systems. Hence, the impedance angle measurement method with signals injected synchronously is proposed. In this method, each DG injects phase-coherent signals to detect islanding using zero-cross points of the voltage (ZCPV) to avoid the protection failures caused by signal interference. An islanding identification criterion based on the measured impedance angle is proposed by analyzing the impedance characteristics of grid connection and islanding, which avoids the influence of variation of the DG operation state on islanding detection. Finally, we present a signal injection strategy and performance analysis in combination with an existing DG control platform, avoiding additional hardware investment. RTDS-based simulation verification shows that the proposed method can 100% avoid DG maloperation due to voltage and frequency disturbances during grid-connected operation and exit operation within 2 s when islanding occurs.

Suggested Citation

  • Fan Yang & Yang Lei & Hechong Chen & Zhichun Yang & Huabo Xu & Heng Chen & Yu Chen, 2023. "An Anti-Islanding Protection Method Based on Voltage-Synchronous Impedance Angle Measurements," Energies, MDPI, vol. 16(20), pages 1-20, October.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:20:p:7139-:d:1262510
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    References listed on IDEAS

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    1. Yilun Shang, 2018. "Resilient Multiscale Coordination Control against Adversarial Nodes," Energies, MDPI, vol. 11(7), pages 1-17, July.
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