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An Optimized Coordination Strategy between Line Main Protection and Hybrid DC Breakers for VSC-Based DC Grids Using Overhead Transmission Lines

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Listed:
  • Xiangyu Zheng

    (Institute of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an 710048, China
    State Grid GanSu Electric Power Research Institution, Lanzhou 730070, China)

  • Rong Jia

    (Institute of Water Resources and Hydro-electric Engineering, Xi’an University of Technology, Xi’an 710048, China
    Energy Intelligence Laboratory, Xi’an University of Technology, Xi’an 710048, China)

  • Linling Gong

    (Lanzhou Petrochemical College of Vocational Technology, Lanzhou 730070, China)

  • Guangru Zhang

    (State Grid GanSu Electric Power Research Institution, Lanzhou 730070, China)

  • Xiangyu Pei

    (China Electric Power Research Institute, Haidian District, Beijing 100192, China)

Abstract

Compared with alternating current (AC) power grids, the voltage-sourced converter (VSC)-based direct current (DC) grid is a system characterized by “low damping”, as a result, once there is a short-circuit fault on the DC transmission line, the fault current will rise more sharply and the influence range will be much wider within the same time scale. Moreover the phenomenon that a local fault causes a whole power grid outage is more likely to occur. Overhead transmission lines (OHLs) have been regarded as the mainstream form of power transmission in future high-voltage, large-capacity and long-distance VSC-based DC grids. However, the application of overhead transmission lines will inevitably lead to a great increase in the probability of DC line failure. Therefore, research on how to isolate the DC fault line quickly is of great significance. Based on the technology route for fault line isolation using DC breakers, on the basis of in-depth analysis of traditional coordination strategy, an optimized coordination strategy between line main protection and a hybrid DC breaker for VSC-based DC grids using overhead transmission lines is proposed in this paper, which takes the start-up output signal of line main protection as the pre-operation instruction of the corresponding hybrid DC breaker. As a result, the risks of blockage of the modular multilevel converter (MMC) closer to the fault position and of damage to power electronic devices in main equipment can be reduced effectively. Finally, the proposed coordination strategy was verified and analyzed through simulation.

Suggested Citation

  • Xiangyu Zheng & Rong Jia & Linling Gong & Guangru Zhang & Xiangyu Pei, 2019. "An Optimized Coordination Strategy between Line Main Protection and Hybrid DC Breakers for VSC-Based DC Grids Using Overhead Transmission Lines," Energies, MDPI, vol. 12(8), pages 1-13, April.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:8:p:1462-:d:223785
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    References listed on IDEAS

    as
    1. Xiangyu Pei & Guangfu Tang & Shengmei Zhang, 2018. "A Novel Pilot Protection Principle Based on Modulus Traveling-Wave Currents for Voltage-Sourced Converter Based High Voltage Direct Current (VSC-HVDC) Transmission Lines," Energies, MDPI, vol. 11(9), pages 1-20, September.
    2. Shimin Xue & Jie Lian & Jinlong Qi & Boyang Fan, 2017. "Pole-to-Ground Fault Analysis and Fast Protection Scheme for HVDC Based on Overhead Transmission Lines," Energies, MDPI, vol. 10(7), pages 1-17, July.
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