Protection of the MMCs of HVDC Transmission Systems against DC Short-Circuit Faults


Vol. 17, No. 1, pp. 242-252, Jan. 2017
10.6113/JPE.2019.17.1.242


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 Abstract

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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Cite this article

[IEEE Style]

T. H. Nguyen and D. Lee, "Protection of the MMCs of HVDC Transmission Systems against DC Short-Circuit Faults," Journal of Power Electronics, vol. 17, no. 1, pp. 242-252, 2017. DOI: 10.6113/JPE.2019.17.1.242.

[ACM Style]

Thanh Hai Nguyen and Dong-Choon Lee. 2017. Protection of the MMCs of HVDC Transmission Systems against DC Short-Circuit Faults. Journal of Power Electronics, 17, 1, (2017), 242-252. DOI: 10.6113/JPE.2019.17.1.242.