T01.3 - Comprehensive Control of Bipolar DC Solid-State Transformers Based on ISOP-QAB Converters

Tuesday, March 24, 2026

9:10 AM - 9:30 AM CT

Location: 214A

Technical Lecture Presenter(s)

Jonghun Yun

Karlsruhe Institute of Technology

Presentation

Co-Author(s)

SM

Seongmin Moon

Seoul National University
JY

Jaesang Yoo

Seoul National University
GD

Giovanni De Carne

Karlsruher Institute of Technologie (KIT)
SC

Shenghui Cui

Seoul National University

This digest proposes a comprehensive control strategy for solid-state transformers (SSTs) based on input-series output-parallel (ISOP) quad active-bridge (QAB) converters for interfacing bipolar dc grids. While existing works have addressed controls for SST in ISOP structure, or for QAB converters, individually, an integrated control scheme that harmonizes the entire system has remained unaddressed. The proposed strategy ensures both voltage and power balancing of the bipolar dc SST by leveraging a straightforward conversion of the power flows into phase-shift angles within each QAB module. The effectiveness of the proposed strategy is validated through experimental tests on an SST prototype with +-750 V / 36 kW ratings, composed of six QAB modules.