AC- and DC-Side Start-Up Strategies for Half-/Full-Bridge Hybrid Modular Multilevel Converter

Ang Li, Lei Lin, Chen Xu, Jiabing Hu

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

5 Citations (Scopus)

Abstract

The hybrid modular multilevel converter (MMC) composed of half-bridge submodules (HBSMs) and full-bridge submodules (FBSMs) is considered as a promising topology to deal with dc fault in high-voltage direct-current (HVDC) transmission systems. Compared with conventional HB-MMC, start-up process in hybrid MMC is different due to SMs topology difference. For ac-side start-up, the voltages of HBSM capacitors and FBSM capacitors are unbalanced after uncontrolled pre-charge process. For dc-side start-up, applying current-limiting resistor to restrict the inrush current can be costly. Aiming to charge the SMs capacitors to rated value smoothly, start-up strategies are proposed in this paper. The proposed ac start-up method can eliminate the unbalance voltage during closed loop pre-charge control stage. The dc start-up method without current-limiting resistor is proposed by regulating dc-link voltage. Simulation in PSCAD/EMTDC is implemented to verify the feasibility and validity of the proposed start-up strategies.

Original languageEnglish
Title of host publicationAPEC 2018 - 33rd Annual IEEE Applied Power Electronics Conference and Exposition
Pages3121-3126
Number of pages6
ISBN (Electronic)9781538611807
DOIs
Publication statusPublished - 18 Apr 2018
Externally publishedYes
Event33rd Annual IEEE Applied Power Electronics Conference and Exposition (APEC 2018) - San Antonio, United States
Duration: 4 Mar 20188 Mar 2018
Conference number: 33

Conference

Conference33rd Annual IEEE Applied Power Electronics Conference and Exposition (APEC 2018)
Abbreviated titleAPEC 2018
Country/TerritoryUnited States
CitySan Antonio
Period4/03/188/03/18

Keywords

  • Closed loop Pre-charge Control
  • Hybrid
  • Modular Multilevel Converter

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