000162560 001__ 162560
000162560 005__ 20251017144608.0
000162560 0247_ $$2doi$$a10.1109/ACCESS.2025.3601207
000162560 0248_ $$2sideral$$a145094
000162560 037__ $$aART-2025-145094
000162560 041__ $$aeng
000162560 100__ $$aCervero, David
000162560 245__ $$aA Modular Solid-State Transformer for 3 kV DC Grids: Design, Topology, and Performance Evaluation
000162560 260__ $$c2025
000162560 5060_ $$aAccess copy available to the general public$$fUnrestricted
000162560 5203_ $$aThe growing emergence of Distributed Energy Resources (DER) that operate natively in dc challenges the traditional logic of unidirectional power flow and the exclusive use of ac in distribution systems due to inefficiency and control problems. dc microgrids are seen as a promising alternative to address these challenges, and Solid-State Transformers (SSTs) could be a feasible solution to enable the development of such controllable hybrid dc/ac grids. This paper presents the design, modular topology, and experimental validation of a 150 kVA SiC-based SST. This SST follows a four-module input-parallel, output-series configuration, enabling the creation of a 3 kV MV dc microgrid from the LV ac electrical grid, allowing intrinsic voltage balancing among modules, straightforward scalability in both voltage and power, and easier maintenance. Each two-stage module, in turn, consists of an active front-end and an isolated dc/dc, which is composed of a dual full-bridge driving a series CLLC resonant tank at 88-90 kHz. Laboratory and field tests demonstrate continuous dc voltage regulation in a range from 1.2 kV to 3 kV, black-start capability and support of the ac grid through reactive power. The prototype achieves a power conversion efficiency of 96.4 % under nominal conditions while transferring 151.6 kW, with line current THD remaining below 1.8 %. The SST, along with the constructed MV dc microgrids, addresses the lack of real demonstrators that can validate the benefits of dc integration.
000162560 536__ $$9info:eu-repo/grantAgreement/EC/H2020/957769/EU/Towards Intelligent DC-based hybrid Grids Optimizing the network performance/TIGON$$9This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 957769-TIGON
000162560 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es
000162560 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000162560 700__ $$aGarcía-Martínez, Eduardo
000162560 700__ $$aAbad, J. Ignacio
000162560 700__ $$aPinilla-Torremocha, Jorge
000162560 700__ $$0(orcid)0000-0001-7407-0608$$aSanz-Osorio, José F.$$uUniversidad de Zaragoza
000162560 700__ $$0(orcid)0000-0003-2360-0845$$aMelero, Julio J.$$uUniversidad de Zaragoza
000162560 7102_ $$15009$$2535$$aUniversidad de Zaragoza$$bDpto. Ingeniería Eléctrica$$cÁrea Ingeniería Eléctrica
000162560 773__ $$g13 (2025), 148047-148059$$pIEEE Access$$tIEEE Access$$x2169-3536
000162560 8564_ $$s9262651$$uhttps://zaguan.unizar.es/record/162560/files/texto_completo.pdf$$yVersión publicada
000162560 8564_ $$s2208957$$uhttps://zaguan.unizar.es/record/162560/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000162560 909CO $$ooai:zaguan.unizar.es:162560$$particulos$$pdriver
000162560 951__ $$a2025-10-17-14:16:09
000162560 980__ $$aARTICLE