Journal of Power Electronics

  • 제17권1호
  • /
  • Pages.242-252
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  • 2017
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  • 1598-2092(pISSN)
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  • 2093-4718(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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Protection of the MMCs of HVDC Transmission Systems against DC Short-Circuit Faults

  • 투고 : 2016.02.21
  • 심사 : 2016.08.27
  • 발행 : 2017.01.20
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초록

This paper deals with the blocking of DC-fault current during DC cable short-circuit conditions in HVDC (High-Voltage DC) transmission systems utilizing Modular Multilevel Converters (MMCs), where a new SubModule (SM) topology circuit for the MMC is proposed. In this SM circuit, an additional Insulated-Gate Bipolar Translator (IGBT) is required to be connected at the output terminal of a conventional SM with a half-bridge structure, hereafter referred to as HBSM, where the anti-parallel diodes of additional IGBTs are used to block current from the grid to the DC-link side. Compared with the existing MMCs based on full-bridge (FB) SMs, the hybrid topologies of HBSM and FBSM, and the clamp-double SMs, the proposed topology offers a lower cost and lower power loss while the fault current blocking capability in the DC short-circuit conditions is still provided. The effectiveness of the proposed topology has been validated by simulation results obtained from a 300-kV 300-MW HVDC transmission system and experimental results from a down-scaled HVDC system in the laboratory.

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참고문헌

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피인용 문헌

  1. Fault Handling Methods and Comparison for Different DC Breaker Topologies and MMC Topologies of the HVDC System vol.2018, pp.2090-1828, 2018, https://doi.org/10.1155/2018/2719380