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Novel Fault Protection Method for Flexible DC Power Systems

Author

Listed:
  • Genqi Chen

    (Shaoxing Power Supply Company, State Grid Zhejiang Electric Power Company, Shaoxing 312000, China)

  • Qing Duan

    (Country Distribution Technology Center, China Electric Power Research Institute, Beijing 100192, China)

  • Caihong Zhao

    (Country Distribution Technology Center, China Electric Power Research Institute, Beijing 100192, China)

  • Haoqing Wang

    (Country Distribution Technology Center, China Electric Power Research Institute, Beijing 100192, China)

  • Guanglin Sha

    (Country Distribution Technology Center, China Electric Power Research Institute, Beijing 100192, China)

  • Jian Gao

    (Country Distribution Technology Center, China Electric Power Research Institute, Beijing 100192, China)

  • Yong Li

    (Shaoxing Power Supply Company, State Grid Zhejiang Electric Power Company, Shaoxing 312000, China)

  • Shuiliang Zhou

    (Shaoxing Power Supply Company, State Grid Zhejiang Electric Power Company, Shaoxing 312000, China)

Abstract

A fault protection method is proposed for flexible direct-current (DC) power systems based on the cosine similarity of currents in current-limiting reactors. The typical characteristics of external and internal faults in a flexible DC power system were analyzed. The principles of cosine similarity and the fault current characteristics of current-limiting reactors were used to distinguish between internal and external faults. The ratio of the average positive and negative voltages of the current-limiting reactor was then used to distinguish the fault types and fault line. Finally, a simulation model of a circular flexible DC power system was constructed using MATLAB/Simulink software (2018b). The simulation results show that the proposed protection scheme can quickly and accurately identify the location and type of faults, and has a strong ability to withstand fault resistance and is less affected by distributed capacitance, noise, and communication delay.

Suggested Citation

  • Genqi Chen & Qing Duan & Caihong Zhao & Haoqing Wang & Guanglin Sha & Jian Gao & Yong Li & Shuiliang Zhou, 2024. "Novel Fault Protection Method for Flexible DC Power Systems," Energies, MDPI, vol. 17(14), pages 1-15, July.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:14:p:3446-:d:1434435
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