NDLI: A novel submodule topology of MMC for blocking DC-fault currents in HVDC transmission systems

Content Provider	IEEE Xplore Digital Library
Author	Thanh Hai Nguyen Dong-Choon Lee
Copyright Year	2015
Description	Author affiliation: Dept. of Electr. Eng., Yeungnam Univ., Gyeongsan, South Korea (Thanh Hai Nguyen; Dong-Choon Lee)
Abstract	This paper proposes a novel topology of submodule (SM) for the modular multilevel converters (MMC) applying to the high-voltage DC (HVDC) transmission systems, where the DC-fault current due to the freewheeling effect of the diode rectifier is blocked during a short-circuit fault in the DC cables. An additional insulated-gate bipolar translator (IGBT) with a low voltage rating is required to be connected in series at the output terminal of a conventional half-bridge SM, where the anti-parallel diode of the additional IGBT is used to block the current from the grid to the DC-link side. Moreover, the additional switching loss of the embedded switch is negligible since the switch is turned on all the time. Therefore, compared with the MMC based on the full-bridge (FB) SM or the hybrid topology of half-bridge (HB) and FBSM, the proposed topology not only provides the DC-fault current blocking capability but also has a lower cost and power loss. The validity of the proposed scheme is verified by the simulation results of 300-MW HVDC transmission system.
Starting Page	2057
Ending Page	2063
File Size	421184
Page Count	7
File Format	PDF
ISBN	9788957082546
ISSN	21506086
DOI	10.1109/ICPE.2015.7168061
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-06-01
Publisher Place	South Korea
Access Restriction	Subscribed
Rights Holder	Korean Institute of Power Electronics
Subject Keyword	Insulated gate bipolar transistors MMC HVDC transmission Capacitors Switches Topology Circuit faults DC faults Fault currents HVDC submodule half bridge full bridge Blocking capability
Content Type	Text
Resource Type	Article

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