Efficiency Enhancement of DC Solid-State Transformers by Dynamically Adjusting Active Cells

Haoyuan Weng, Yongshan Jiang, Min Chen, Changsheng Hu, Philip T. Krein, Dehong Xu

Research output: Contribution to journalArticlepeer-review

Abstract

A dc solid-state transformer (DCSST) is a key building block for future medium-voltage dc systems, and its efficiency is important to the entire system. High-voltage semiconductor devices enable substantial reduction of the power conversion cell count in a DCSST. The number of active (in-use) cells will influence the DCSST efficiency. In this article, the number of active cells is dynamically adjusted based on the load condition to enhance DCSST efficiency. A mapping between the number of active cells and DCSST efficiency is developed. A smooth shifting control strategy is proposed to avoid large perturbations and ensure safe operation when dynamically bypassing or inserting certain cells. An average model of a DCSST is derived to facilitate control design. Simulations and experiments are provided to verify the proposed solution.

Original languageEnglish (US)
Pages (from-to)14942-14955
Number of pages14
JournalIEEE Transactions on Power Electronics
Volume38
Issue number12
DOIs
StatePublished - Dec 1 2023

Keywords

  • bumpless transfer
  • dc solid state transformer
  • efficiency
  • Inductors
  • Insulated gate bipolar transistors
  • Perturbation methods
  • Power conversion
  • Resonant converters
  • smooth shifting
  • Transformers
  • Voltage
  • Bumpless transfer
  • dc solid-state transformer (DCSST)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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