IEEE IES ISIE 2026 Winner - Cascaded H-Active Bridge for Battery Energy Storage Systems

Paper Title: Cascaded H-Active Bridge for Battery Energy Storage Systems Autors: Matias Veillon, Christian Rojas, Eduardo Espinosa, Sebastian Rivera and Hector Young. Affiliations: Universidad Tecnica Federico Santa Maria, Universidad Catolica de la Santisima Concepción, Delft University of Technology and Universidad de la Frontera. Paper Abstract: Today, galvanic isolation is mandatory in most grid-connected energy storage systems to ensure system integrity; therefore, isolated converters such as the Dual Active Bridge play a fundamental role. In systems with multiple batteries, a significant number of isolated converters, multi-input topologies, or multi-active bridges are typically required to optimize overall system performance. However, the use of these topologies can be costly and/or less efficient due to the design constraints of the high-frequency converter. This paper proposes a multi-input, isolated, multilevel topology based on the Cascaded H-Bridge converter combined with a conventional high-frequency transformer. In addition, a model-based predictive voltage control strategy is proposed for its two operating modes: charging and discharging. Simulation results satisfactorily demonstrate the performance of the proposed topology, model, and control strategy.