Special Session 6
Medium-Voltage Solid-State Transformer and Smart Power Routing Technologies for Future Grid Applications
Medium-voltage solid-state transformers
(MV-SSTs) are emerging as promising alternatives to conventional
line-frequency-transformer-based power conversion interfaces for
next-generation grid infrastructure and high-power applications. By
leveraging advanced power electronics conversion and control
capabilities, MV-SSTs offer new opportunities for smarter power
routing and enhanced integration of emerging high-power loads.
This Special Session focuses on recent advances in medium-voltage
solid-state power conversion technologies for data centers, hydrogen
electrolyzers, and ultra-fast EV charging infrastructure. The
session welcomes contributions addressing the unique power
conversion, scalability, efficiency, reliability, and
grid-integration challenges associated with these emerging
high-power applications.
The scope of this Special Session includes, but is not limited to,
MV-SST architectures, converter topologies, modulation and
coordinated control strategies, smart power routing and energy
management, grid-supportive services, fault ride-through operation,
bidirectional semiconductor devices, and reliability-oriented
design.
The aim is to provide a platform for researchers and industry
experts to exchange innovative ideas and discuss future directions
for efficient, resilient, and sustainable medium-voltage power
conversion systems.
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Special Session Chair
Qingxiang Liu
City University of Hong Kong, China
Dr. Qingxiang Liu (Senior Member, IEEE) is a Postdoctoral Fellow in
the Department of Electrical Engineering at City University of Hong
Kong. He received the B.Sc. degree in electrical engineering from
Wuhan University, Wuhan, China, in 2018, and the M.Sc. and Ph.D.
degrees in power electronics from Nanyang Technological University
(NTU), Singapore, in 2019 and 2024, respectively. Dr. Liu was the
recipient of the Professional Engineers Board Gold Medal in 2019 and
the Research Excellence Award in 2024 from the School of Electrical
and Electronic Engineering and the Graduate College, NTU.
His research focuses on advanced modulation and control techniques
for multilevel converters.
Special Session Co-Chair
Salvador Ceballos
City University of Hong Kong, China
Dr. Salvador Ceballos received the M.S. degree in Physics from the
University of Cantabria, Santander, Spain, in 2001, and the M.S. and
Ph.D. degrees in Electronic Engineering from the University of the
Basque Country, Bilbao, Spain, in 2002 and 2008, respectively.
From 2002 to 2025, he was with Tecnalia Research and Innovation,
where he served as a Principal Researcher in the Energy, Climate and
Urban Transition Unit. Since 2026, he has been with the Department
of Electrical Engineering at the City University of Hong Kong.
Dr. Ceballos has participated in more than 60 research projects,
primarily focused on the control of multilevel converters for a wide
range of applications. His research interests include voltage-source
converter-based HVDC (VSC-HVDC) transmission systems, medium-voltage
DC (MVDC) applications, stability analysis of power
converter-dominated power systems, and the development of
grid-forming and grid-supporting control strategies for AC, DC, and
hybrid AC/DC grids.
He has co-authored 85 articles in international scientific journals
and 118 papers in international conferences. In addition, he is a
co-inventor of 2 patents, a contributor to 2 software licenses, and
an author of 4 book chapters. Dr. Ceballos has also contributed to
the research community through the co-organization of four special
sessions at IEEE international conferences focused on multilevel
converters, as well as a special section for the IET Power
Electronics journal.
Special Session Co-Chair
Jiaxin Dong
Singapore Institute of Technology, Singapore
Dr. Jiaxin Dong is a Research Fellow at the Singapore Institute
of Technology (SIT), Singapore. He received his Ph.D. degree in
Electrical and Electronic Engineering from Nanyang Technological
University (NTU), Singapore. Dr. Dong’s research interests include
power electronics, electric vehicle integration, vehicle-to-grid
(V2G) technologies, smart grids, and digitalized energy systems.
Dr. Dong has authored and co-authored numerous journal and
conference publications in the fields of power electronics, power
systems, and sustainable energy technologies. His research focuses
on the design, modeling, control, and optimization of advanced power
converter systems for emerging energy applications. He has worked on
dual-active-bridge (DAB) converters, multilevel power conversion
techniques, and the integration of power electronic systems within
modern energy infrastructures. He has also been actively involved in
industry-driven and government-funded projects related to EV
charging infrastructure, V2G systems, microgrids, and
hardware-in-the-loop (HIL) validation platforms, bridging
fundamental converter research with practical deployment and system
integration.
Special Session Co-Chair
Ezequiel Rodriguez Ramos
Senior Engineer, Singapore
Dr. Ezequiel Rodriguez Ramos (Member, IEEE) was born in Tarragona,
Spain, in 1994. He received the bachelor’s degree in electrical
engineering and the master’s degree in engineering and technology of
electronic systems (topping the 2012 and 2016 graduating cohorts as
valedictorian) from Universitat Rovira i Virgili, Catalonia, Spain,
in 2016 and 2017, respectively, and the Ph.D. degree in electrical
engineering from Nanyang Technological University (NTU), Singapore,
in 2022.
Dr. Rodriguez’s research interests include modeling and the control
of power electronic converters, with an emphasis on modular
multilevel cascade converters for energy storage and FACTS
applications.
Dr. Rodriguez was the recipient of the 2022 Best Thesis Award from
the School of Electrical and Electronic Engineering at NTU.
Special Session Co-Chair
Yu Zeng
University of Electronic Science and Technology of China, China
Dr. Yu Zeng (Senior Member, IEEE) received the B.S. and M.E.
degrees in electrical engineering from Shandong University, China,
in 2017 and 2019 respectively, and the Ph.D. degree in Electrical
and Electronic Engineering (EEE) from Nanyang Technological
University (NTU), Singapore, in 2023.
From 2023 to 2026, he worked as Research Fellow in NTU, and City
University of Hong Kong, respectively. He is currently a UESTC100
Young Professor at Shenzhen Institute for Advanced Studies (SIAS),
University of Electronic Science and Technology of China (UESTC).
His research interests include power electronics systems, artificial
intelligence, renewable energy sources, and electric aircraft. He
received the Chinese Government Award for Outstanding Self-Financed
Students Abroad(Special Excellence Award) in 2025, and Best Thesis
Award from NTU-EEE in 2024. He serves as the Young Editor Board
Member for the Protection and Control of Modern Power Systems,
Chinese Journal of Electrical Engineering, and IET Energy Conversion
and Economics. He also serves as Session Chairs for several top
conferences.