Analysis of Converter Valve-Side Single-Phase-to-Ground Faults in Symmetrical Monopolar MMCs

Gen Li, Pingyang Sun, Sahar Pirooz Azad, Georgios Konstantinou

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

Converter valve-side single-phase-to-ground (SPG) faults are among the most critical issues affecting the secure operation of modular multilevel converters (MMCs). However, the fault characteristics of these faults in symmetrical monopolar MMCs have not been thoroughly explored. This paper aims to fill this gay by theoretically investigating SPG faults in such systems. The analysis considers various influencing factors, including MMC grounding schemes and dc line types. The findings demonstrate that valve-side SPG faults cause dc voltage oscillations and therefore, large discharging currents from the distributed capacitors of dc lines. These scenarios are examined through mathematical analyses and verified through simulations of a generic MMC-HVDC system using PSCAD/EMTDC. The results accurately reveal the fault behaviors under different system conditions, providing valuable insights for the design of protection systems and insulation.
Original languageEnglish
Title of host publicationProceedings of 50th Annual Conference of the IEEE Industrial Electronics Society
Number of pages6
PublisherIEEE
Publication statusAccepted/In press - 2024
Event50th Annual Conference of the IEEE Industrial Electronics Society - Chicago, United States
Duration: 3 Nov 20246 Nov 2024

Conference

Conference50th Annual Conference of the IEEE Industrial Electronics Society
Country/TerritoryUnited States
CityChicago
Period03/11/202406/11/2024

Keywords

  • DC systems
  • MMC
  • Single-phase-to-ground fault
  • Converter protection
  • Fault

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