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Reduced switch multiple active bridge DC-DC converter for modular solid-state transformers.

Saeid Khani1,2, Seyed Hossein Hosseini3,4, Mehran Sabahi5

  • 1East Azarbaijan Electric Power Distribution Company, Tabriz, Iran. saeid_khani82@yahoo.com.

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A novel reduced switch-multiple active bridge (RS-MAB) DC-DC converter enhances solid-state transformer (SST) efficiency and power density. Extended triangular current mode (TCM) modulation ensures soft switching for improved performance.

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Renewable Energy Systems

Background:

  • Solid-state transformers (SSTs) are crucial for modern power grids.
  • Existing SST designs often face challenges with efficiency and power density.
  • Reducing component count is key to improving SST performance.

Purpose of the Study:

  • To introduce a novel reduced switch-multiple active bridge (RS-MAB) DC-DC converter topology.
  • To enhance the efficiency and power density of modular SSTs.
  • To validate a new modulation strategy for improved converter operation.

Main Methods:

  • Theoretical analysis of the RS-MAB converter structure.
  • Development and application of extended triangular current mode (TCM) modulation.
  • Numerical simulations and laboratory-scale experimental validation.

Main Results:

  • The RS-MAB converter significantly reduces switching devices and high-frequency transformers.
  • Extended TCM modulation enables soft switching across the entire operational range.
  • Experimental results confirm the feasibility and validity of the proposed RS-SQAB converter and modulation.

Conclusions:

  • The proposed RS-MAB DC-DC converter is an effective building block for modular SSTs.
  • The extended TCM modulation strategy successfully achieves soft switching and enhances performance.
  • The study validates a promising approach for more efficient and compact SST designs.