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The Analysis and Solution of Current Differential Protection Maloperation for Transmission Line with High Series Compensation Degree

Author

Listed:
  • Zhenxing Li

    (College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443000, China)

  • Yuting Fu

    (College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443000, China)

  • Ling Wang

    (State Grid Yichang Electric Power Company, Yichang 443000, China)

  • Lu Wang

    (College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443000, China)

  • Wenliang Bao

    (College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443000, China)

  • Yanxia Chen

    (Beijing Electric Power Research Institute, Beijing 100075, China)

Abstract

With the increasing integration of huge-size generators and tighter interconnection among power grids, in internal fault, the fault current of Series Compensated (SC) lines may be reversed. At this time, the differential protection of SC lines may fail to operate due to insufficient sensitivity. In this research analyzes the reasons for the current reverse in SC lines and its effect on differential protection. The operation characteristics of differential protection are studied by focusing on multiple factors, including different series compensation degree, fault types, system operation mode, power angle difference, fault points, and transition resistance. An improved criterion based on the current amplitudes and phases on both sides of the series compensated lines is proposed. Further, to strengthen the operation characteristics of differential protection, the triple-fold line is chosen to improve the sensitivity for internal faults in this paper. The criterion is effective to improve the protection sensitivity of SC lines during internal fault. The PSCAD/EMTDC simulation and the power system dynamic physics simulation demonstrates that protection sensitivity is obviously increased in the improved scheme.

Suggested Citation

  • Zhenxing Li & Yuting Fu & Ling Wang & Lu Wang & Wenliang Bao & Yanxia Chen, 2019. "The Analysis and Solution of Current Differential Protection Maloperation for Transmission Line with High Series Compensation Degree," Energies, MDPI, vol. 12(9), pages 1-22, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:9:p:1639-:d:227048
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    References listed on IDEAS

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    1. Cui Tang & Xianggen Yin & Zhe Zhang, 2017. "Research on Capacitance Current Compensation Scheme of Current Differential Protection of Complex Four-Circuit Transmission Lines on the Same Tower," Energies, MDPI, vol. 10(7), pages 1-16, July.
    2. Guibin Zou & Shenglan Song & Shuo Zhang & Yuzhi Li & Houlei Gao, 2018. "A Novel Busbar Protection Based on the Average Product of Fault Components," Energies, MDPI, vol. 11(5), pages 1-16, May.
    3. Jun Yao & Qing Li & Zhe Chen & Aolin Liu, 2013. "Coordinated Control of a DFIG-Based Wind-Power Generation System with SGSC under Distorted Grid Voltage Conditions," Energies, MDPI, vol. 6(5), pages 1-21, May.
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    Cited by:

    1. Jingde Xia & Shaozhuo Li & Shuping Gao & Wenquan Shao & Guobing Song & Changjiang Chen, 2021. "Research on Differential Protection of Generator Based on New Braking Mode," Energies, MDPI, vol. 14(7), pages 1-16, March.

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