Multiport Smart Transformers – Architectures, Applications, and Future Trends
Authors: Ali Sharida, Alvaro Carreno, Abdullah Berkay Bayindir, Alamera Nouran Nader Alquennah, Anas Karaki, Sertac Bayhan, Haitham Abu-Rub et Mariusz Malinowski
Extended Abstract:
Multiport smart transformers (MSTs) emerge as a transformative technology in modern power systems, providing advanced flexibility, improved energy efficiency, and fault-tolerant operation. The “smart” designation highlights capabilities far beyond traditional transformer control, encompassing intelligent decision-making, real-time energy management, predictive analytics, and seamless communication interfaces. By utilizing high-frequency magnetic cores instead of conventional low-frequency systems, MSTs offer galvanic isolation, and significant reductions in size and weight. Furthermore, MSTs support seamless bidirectional power flow, enabling the effective integration of renewable energy sources, electric vehicle (EV) charging stations, and microgrids while enhancing overall grid stability. Thanks to their multiport modularity, MSTs are widely applicable across several interconnected domains, such as: (i) EV Fast-Charging, (ii) Smart Grids and Microgrids, (iii) Renewable Energy Integration, and (iv) Railway Electrification.
The foundational design of an MST relies on integrating multiple energy sources and loads through a shared magnetic core that eliminates the need for direct electrical connections. Designing this core requires careful iterative material selection based on operating frequency and temperature stability, as well as complex thermal management and insulation sizing.
Operating MSTs as decentralized power hubs relies on robust control mechanisms spanning power flow management, voltage and frequency regulation, as well as fault protection. To effectively balance generation and demand while supporting modern applications like vehicle-to-grid, MSTs utilize diverse techniques ranging from basic rule-based control to advanced artificial-intelligence based control methods. These advanced strategies are also applied within hierarchical layers to tightly regulate voltage and frequency, combining fast, communication-less methods to ensure robust power sharing. Furthermore, to safeguard the system against internal and external faults, MSTs employ different protection strategies that classifies anomalies, diagnoses them using sensors, and actively mitigates risks through current limiting, surge arresters, and redundant power pathways.
Despite their immense potential, the widespread adoption of MSTs faces technical hurdles such as intense thermal management constraints, electromagnetic interference, lack of standardization, and high control complexity. Future development is projected to focus on optimizing the practicality of multi-active bridge based MSTs, advancing coordinated multiport control algorithms, and refining magnetic integration techniques to meet the flexible, grid-interactive demands of next-generation power systems.
