A DC Solid State Transformer with DC Fault Ride-through Capability

Haoyuan Weng, Jinghang Li, Keyan Shi, Min Chen, Philip T. Krein, Dehong Xu

Research output: Contribution to journalArticlepeer-review

Abstract

This paper investigates a dc solid state transformer (DCSST) with dc fault ride-through (FRT) capability for medium voltage dc (MVDC) systems. The fault ride through requirement for DCSST in dc gird is investigated. Short circuit fault clearance on the medium voltage (MV) side is realized by introducing full bridge converters with cascaded dc converter modules on the MV side of the DCSST. The fault ride-through strategy under typical voltage sags is analyzed. Factors affecting the fault clearing and system recovery are considered, including the number of full bridge converters, the values of dc inductance and the voltage of dc-link bus. The concept is verified with both simulations and experiments.

Original languageEnglish (US)
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
DOIs
StateAccepted/In press - 2021
Externally publishedYes

Keywords

  • Bridge circuits
  • Circuit breakers
  • Circuit faults
  • dc fault ride-through
  • dc solid state transformer
  • Fault current limiters
  • Fault currents
  • MVDC system
  • Power system stability
  • short circuit fault
  • Thyristors

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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