CC BY 4.0Schwanninger, RaffaelRaffaelSchwanningerStöcklein, NiklasNiklasStöckleinWeitz, NikolaiNikolaiWeitzYang, XiaotianXiaotianYangMaerz, MartinMartinMaerz2025-11-032025-11-032025https://publica.fraunhofer.de/handle/publica/497998https://doi.org/10.24406/publica-597610.1109/TPEL.2025.362188510.24406/publica-59762-s2.0-105019337150This paper introduces a control strategy for a Modular Multi-Active Bridge (MMAB) architecture that extends the single phase shift as a novel approach to enable fully decentralized control of the Modular Active Cell (MAC) on a single, arbitrarily large multi-winding transformer. The MAC aims to provide a fully modular, configurable, and scalable solution for Solid State Transformers (SSTs) and Energy Routers, enabling full power and voltage variability in isolated interconnections of diverse DC networks. A novel modeling approach based on discrete-time state-space is introduced. The model is verified through measurements and simulation, showing high accuracy and prediction capability.entruemulti -input-multi-output (MIMO)Multi-active bridge (MAB)multicellmultiport energy routerpower electronics building blocksolid state transformer (SST)journal article