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Hybrid Design of Modular Multilevel Converters for HVDC Systems Based on Various Submodule Circuits

Qin, Jiangchao, Saeedifard, Maryam, Rockhill, Andrew, Zhou, Rui·2015·IEEE Transactions on Power Delivery

Abstract

The modular multilevel converter (MMC) has become the most promising converter technology for high-voltage direct current (HVDC) transmission systems. However, similar to any other voltage-sourced converter-based HVDC system, MMC-HVDC systems with the half-bridge submodules (SMs) lack the capability of handling dc-side short-circuit faults, which are of severe concern for overhead transmission lines. In this paper, two new SM circuit configurations as well as a hybrid design methodology to embed the dc-fault-handling capability in the MMC-HVDC systems are proposed. By combining the features of various SM configurations, the dc-fault current path through the freewheeling diodes is eliminated and the dc-fault current is enforced to zero. Several MMC configurations based on the proposed hybrid design method and various SM circuits, that is, the half-bridge, the full-bridge, the clamp-double, and the five-level cross-connected SMs, as well as the newly proposed unipolar-voltage full-bridge and three-level cross-connected SMs, are investigated and compared in terms of the dc-fault-handing capability, semiconductor power losses, and component requirements. The studies are carried out based on time-domain simulation in the PSCAD/EMTDC software environment for various SM configurations and dc-fault conditions. The reported study results demonstrate the proposed hybrid-designed MMC-HVDC system based on the combination of the half-bridge and the proposed SM circuits is the optimal design among all evaluated systems in terms of the dc-fault-handing capability, semiconductor power losses, and component requirements.

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Metadata

Authors
Qin, J., Saeedifard, M., Rockhill, A., & Zhou, R.
Venue
IEEE Transactions on Power Delivery
Published
2015-02
Volume
30
Issue
1
Pages
385-394
ISSN
  • 0885-8977 (ISSN-L)
  • 1937-4208
OpenAlex
W2091065431
Cited by
358
References
25
FWCI
15.56
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Hybrid Design of Modular Multilevel Converters for HVDC Systems Based on Various Submodule Circuits. https://app.cochat.ai/papers/10.1109/tpwrd.2014.2351794
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Qin, J., Saeedifard, M., Rockhill, A., & Zhou, R. (2015). Hybrid Design of Modular Multilevel Converters for HVDC Systems Based on Various Submodule Circuits. IEEE Transactions on Power Delivery. https://doi.org/10.1109/tpwrd.2014.2351794

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.