Design and Implementation of a Modular Multilevel Series-Parallel Converter for Second-Life Battery Energy Storage Systems
Esteban Concha (Universidad Católica de la Santísima Concepción)
R. Lizana F. (Universidad Católica de la Santísima Concepción)
S. Rivera (TU Delft - DC systems, Energy conversion & Storage, Universidad Católica de la Santísima Concepción)
Abraham Marquez Alcaide (University of Seville)
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Abstract
Battery Energy Storage Systems (BESS) offer scalable energy storage solutions, especially valuable for remote, off-grid applications. However, traditional battery packs with fixed series-parallel configurations lack reconfigurability and are limited by the weakest cell, hindering their application for second-life batteries. The Modular Multilevel Series-Parallel Converter (MMSPC) addresses these limitations by enabling dynamic reconfiguration, optimizing cell balancing, and enhancing energy control. This paper experimentally evaluates a single-phase BESS based on the MMSPC with an output power equivalent to 2 kW and two battery units (155V), demonstrating stable output and reduced internal losses across varied battery parameters.
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