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

Thanh Hai Nguyen | Zendy; DongChoon Lee | Zendy

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

Author(s) -

Thanh Hai Nguyen,

DongChoon Lee

Publication year - 2017

Publication title -

journal of power electronics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.23

H-Index - 33

eISSN - 2093-4718

pISSN - 1598-2092

DOI - 10.6113/jpe.2017.17.1.242

Subject(s) - topology (electrical circuits) , converters , electrical engineering , insulated gate bipolar transistor , modular design , engineering , fault (geology) , electronic engineering , network topology , blocking (statistics) , hvdc converter station , transmission system , voltage , transmission (telecommunications) , computer science , computer network , seismology , geology , operating system

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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