Soft-Switching Smart Transformer Design and Application for Photovoltaic Integrated Smart City Power Distribution

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dc.authoridDemirdelen, Tugce/0000-0002-1602-7262
dc.authoridESENBOGA, BURAK/0000-0002-7777-259X
dc.contributor.authorEsenboga, Burak
dc.contributor.authorDemirdelen, Tugce
dc.date.accessioned2025-01-06T17:44:22Z
dc.date.available2025-01-06T17:44:22Z
dc.date.issued2023
dc.description.abstractSmart city power distributions have become promising technologies to meet the demand for energy in developed countries. However, increase in smart grids causes several power quality problems on the smart grid, in particular, current and voltage harmonic distortions, sudden voltage sag and swells, fault current, and isolation deterioration. Smart transformers are potential solutions to improve the power quality on the electric grid. They present energy efficiency, ensure grid reliability and power flow control, voltage regulation, bidirectional power flow, fault current limiting, harmonic blocking, and galvanic isolation. Therefore, this paper offers an optimal selection of a three-stage (AC-DC-DC-AC) smart transformer model and power control strategy for solar PV power plant integrated smart grids. The topology of the rectifier, isolated bidirectional converter, and inverter has soft-switching features. This enables low conduction loss, low electromagnetic interference (EMI), high efficiency, achievable zero-voltage switching for converters, and zero-current switching for electrical auxiliary systems. Operation strategies of the proposed ST, PWM control, voltage, and current control between converters, including a medium-voltage (MV) high-frequency transformer to realize a 10 kVA, 450 Vdc to 220 Vdc, or 220 Vac ST, are presented. Significantly, the ST prototype achieves 96.7% conversion efficiency thanks to its control strategy, even under unstable power generation conditions from the solar PV plant. Experimental results obtained on the 344 Vac 10.4 A load current validates the dv/dt rate 6.8 kV/us. The dynamic and experimental results of the proposed bidirectional smart transformer demonstrate the success in preventing power quality problems for photovoltaic integrated smart city power distribution.
dc.description.sponsorshipScientific Project Unit of Adana Alparslan Turkes Science and Technology University; Scientific and Technological Research Council of Turkey; [20803001]; [2210319]
dc.description.sponsorshipThis research was supported by the Scientific Project Unit of Adana Alparslan Turkes Science and Technology University (Project Number: 20803001) and the Scientific and Technological Research Council of Turkey (TUBITAK Project Number: 2210319).
dc.identifier.doi10.3390/su15010032
dc.identifier.issn2071-1050
dc.identifier.issue1
dc.identifier.scopus2-s2.0-85146018337
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.3390/su15010032
dc.identifier.urihttps://hdl.handle.net/20.500.14669/3030
dc.identifier.volume15
dc.identifier.wosWOS:000908535500001
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherMdpi
dc.relation.ispartofSustainability
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_20241211
dc.subjectsmart transformer
dc.subjectpower quality
dc.subjectsmart city
dc.subjectpower distribution
dc.subjectsolar PV
dc.titleSoft-Switching Smart Transformer Design and Application for Photovoltaic Integrated Smart City Power Distribution
dc.typeArticle

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