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Synchronization of Low Voltage Grids Fed by Smart and Conventional Transformers

Giacomuzzi, Stefano; De Carne, Giovanni; Pugliese, Sante; Buja, Giuseppe; Liserre, Marco; Kazerooni, Ali

Abstract (englisch):
The Smart Transformer (ST) is a power electronicsbased transformer, which operates as grid-forming converter in the low voltage-fed grid. It synthesizes the voltage waveform with magnitude, phase and frequency independently from the main power system. If a meshed operation of the ST with a conventional transformer is required, to improve the power flow control and to control the voltage profile, the voltage waveforms between the two grids have to be synchronized. The switching under different voltage magnitude, phase or frequency, can lead to a large power in-rush. This work proposes a synchronization strategy that enables a seamless transition of the ST to parallel operations with conventional transformers. Differently from classical communication-based methods, this work addresses a more realistic implementation case with limited communication infrastructure. The ST relies only on local measurements and on its advanced control capability to determine the effective switch to parallel operations. The performance of the proposed strategy has been proved analytically and through simulations in a PLECS/Matlab environment, and validated experimentally by means of Power-Hardware-In-Loop (PHIL) evaluation.

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Postprint §
DOI: 10.5445/IR/1000129432/post
Veröffentlicht am 08.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 1949-3053, 1949-3061
KITopen-ID: 1000129432
Weitere HGF-Programme 37.12.03 (POF IV, LK 01) Smart Areas and Research Platforms
Erschienen in IEEE transactions on smart grid
Verlag Institute of Electrical and Electronics Engineers (IEEE)
Seiten 1
Bemerkung zur Veröffentlichung It is Open Access
Vorab online veröffentlicht am 01.02.2021
Schlagwörter Smart Transformer, Solid State Transformer,Power Hardware In the Loop, Normally Open Poin
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