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A Novel Protection Strategy for Single Pole-to-Ground Fault in Multi-Terminal DC Distribution Network

Author

Listed:
  • Ruixiong Yang

    (DC Power Distribution and Consumption Technology Research Center, Guangdong Power Grid Co., Ltd., Zhuhai 519099, China)

  • Ke Fang

    (Energy and Electricity Research Center, Jinan University, Zhuhai 519070, China)

  • Jianfu Chen

    (DC Power Distribution and Consumption Technology Research Center, Guangdong Power Grid Co., Ltd., Zhuhai 519099, China)

  • Yong Chen

    (DC Power Distribution and Consumption Technology Research Center, Guangdong Power Grid Co., Ltd., Zhuhai 519099, China)

  • Min Liu

    (Energy and Electricity Research Center, Jinan University, Zhuhai 519070, China)

  • Qingxu Meng

    (Energy and Electricity Research Center, Jinan University, Zhuhai 519070, China)

Abstract

The single pole-to-ground (SPG) fault is one of critical failures which will have a serious impact on the stable operation of the multi-terminal DC distribution network based on the modular multilevel converter (MMC). It is very significant to analyze fault characteristics for detecting faults and protection design. This paper established the DC SPG fault model, which showed that in the presence of a reactor, the short-circuit current was reduced from 2.3 kA to 1 kA at 6 ms after the fault. Then, a novel SPG fault protection strategy was proposed, which detected the current derivative in connection transformer grounding branch. When the value increases past the threshold of current derivative, small resistance was switched on to increase fault current. Thus, the reliability of differential protection was enhanced. Compared with the traditional protection method, the proposed method does not need communication, and improved the speed of protection. Finally, the simulation model was established in PSCAD/EMTDC. The model included three converter stations: T1, T2 and T3. Among them, T1 outputs power, and T2 and T3 receive power. The results of RTDS showed that the DC circuit breaker operated within 3 ms, the three-port circuit breaker worked within 50 ms, which proves that the proposed strategy was effective. At this time, the system switched from the T1–T2–T3 three-terminal networking operation mode to the T1–T2 two-terminal hand-in-hand operation mode. Since the T3 terminal no longer received power, the transmission power of the T1 terminal decreased, and the received power of the T2 terminal remained unchanged.

Suggested Citation

  • Ruixiong Yang & Ke Fang & Jianfu Chen & Yong Chen & Min Liu & Qingxu Meng, 2023. "A Novel Protection Strategy for Single Pole-to-Ground Fault in Multi-Terminal DC Distribution Network," Energies, MDPI, vol. 16(6), pages 1-16, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:6:p:2921-:d:1104376
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    References listed on IDEAS

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    1. Tarek Abedin & M. Shahadat Hossain Lipu & Mahammad A. Hannan & Pin Jern Ker & Safwan A. Rahman & Chong Tak Yaw & Sieh K. Tiong & Kashem M. Muttaqi, 2021. "Dynamic Modeling of HVDC for Power System Stability Assessment: A Review, Issues, and Recommendations," Energies, MDPI, vol. 14(16), pages 1-25, August.
    2. Blond, S. Le & Bertho, R. & Coury, D.V. & Vieira, J.C.M., 2016. "Design of protection schemes for multi-terminal HVDC systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 56(C), pages 965-974.
    3. Zheng Xu & Huangqing Xiao & Liang Xiao & Zheren Zhang, 2018. "DC Fault Analysis and Clearance Solutions of MMC-HVDC Systems," Energies, MDPI, vol. 11(4), pages 1-16, April.
    Full references (including those not matched with items on IDEAS)

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