Pre-charging and DC fault ride-through of hybrid MMC based HVDC systems

Rong Zeng, Lie Xu, Liangzhong Yao, D John Morrow

Research output: Contribution to journalArticle

96 Citations (Scopus)

Abstract

Compared to half-bridge based MMCs, full-bridge based systems have the advantage of blocking dc fault, but at the expense of increased power semiconductors and power losses. In view of the relationships among ac/dc voltages and currents in full-bridge based MMC with the negative voltage state, this paper provides a detailed analysis on the link between capacitor voltage variation and the maximum modulation index. A hybrid MMC, consisting of mixed half-bridge and full-bridge circuits to combine their respective advantages is investigated in terms of its pre-charging process and transient dc fault ride-through capability. Simulation and experiment results demonstrate the feasibility and validity of the proposed strategy for a full-bridge based MMC and the hybrid MMC.
LanguageEnglish
Number of pages9
JournalIEEE Transactions on Power Delivery
Early online date24 Sep 2014
DOIs
Publication statusPublished - 2015

Fingerprint

Electric potential
Bridge circuits
Telecommunication links
Capacitors
Modulation
Semiconductor materials
Experiments

Keywords

  • capacitor voltage ripple
  • modular multilevel converter
  • DC fault
  • hybrid power systems

Cite this

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title = "Pre-charging and DC fault ride-through of hybrid MMC based HVDC systems",
abstract = "Compared to half-bridge based MMCs, full-bridge based systems have the advantage of blocking dc fault, but at the expense of increased power semiconductors and power losses. In view of the relationships among ac/dc voltages and currents in full-bridge based MMC with the negative voltage state, this paper provides a detailed analysis on the link between capacitor voltage variation and the maximum modulation index. A hybrid MMC, consisting of mixed half-bridge and full-bridge circuits to combine their respective advantages is investigated in terms of its pre-charging process and transient dc fault ride-through capability. Simulation and experiment results demonstrate the feasibility and validity of the proposed strategy for a full-bridge based MMC and the hybrid MMC.",
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Pre-charging and DC fault ride-through of hybrid MMC based HVDC systems. / Zeng, Rong; Xu, Lie; Yao, Liangzhong; Morrow, D John.

In: IEEE Transactions on Power Delivery, 2015.

Research output: Contribution to journalArticle

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AU - Zeng, Rong

AU - Xu, Lie

AU - Yao, Liangzhong

AU - Morrow, D John

N1 - (c) 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.

PY - 2015

Y1 - 2015

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AB - Compared to half-bridge based MMCs, full-bridge based systems have the advantage of blocking dc fault, but at the expense of increased power semiconductors and power losses. In view of the relationships among ac/dc voltages and currents in full-bridge based MMC with the negative voltage state, this paper provides a detailed analysis on the link between capacitor voltage variation and the maximum modulation index. A hybrid MMC, consisting of mixed half-bridge and full-bridge circuits to combine their respective advantages is investigated in terms of its pre-charging process and transient dc fault ride-through capability. Simulation and experiment results demonstrate the feasibility and validity of the proposed strategy for a full-bridge based MMC and the hybrid MMC.

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