Title:
7.2 kV Three-Port SiC Single-Stage Current-Source Solid-State Transformer with 90 kV Lightning Protection
7.2 kV Three-Port SiC Single-Stage Current-Source Solid-State Transformer with 90 kV Lightning Protection
| dc.contributor.author | Zheng, Liran | |
| dc.contributor.author | Han, Xiangyu | |
| dc.contributor.author | Xu, Chunmeng | |
| dc.contributor.author | Kandula, Rajendra Prasad | |
| dc.contributor.author | Graber, Lukas | |
| dc.contributor.author | Saeedifard, Maryam | |
| dc.contributor.author | Divan, Deepakraj M. | |
| dc.contributor.corporatename | Georgia Institute of Technology. School of Electrical and Computing Engineering | |
| dc.date.accessioned | 2023-07-11T16:52:48Z | |
| dc.date.available | 2023-07-11T16:52:48Z | |
| dc.date.issued | 2022-05 | |
| dc.description.abstract | This article proposes a multiport modular single-stage current-source solid-state transformer (SST) for applications like photovoltaic, energy storage integration, electric vehicle fast charging, data center, etc. The 7.2 kV 50 kVA current-source SST consists of five input-series output-parallel modules, each based on 3.3 kV SiC reverse-blocking MOSFET-plus-diode modules. The proposed SST has some unique features. First, compared to the voltage-source or matrix converter-based SSTs, the current-source SST has a unique advantage of single-stage isolated AC/DC or AC/AC conversion with an inductive DC link, but no medium-voltage (MV) AC experiments have been reported. This article for the first time demonstrates MV AC current-source SST up to 7.5 kV peak. Second, the multiport SST has a buffer port for active power decoupling (APD) or energy storage integration. The double-line-frequency power ripple from single-phase AC grid normally results in a large capacitor size in MV SSTs. The APD scheme is proposed in MV applications for the first time to enable a reduced DC link and the electrolytic capacitor-less SST with high reliability. Third, as a direct grid-connected converter without line-frequency transformer, insulation and protection are critical. A medium-frequency transformer design passes 55 kV basic-insulation level (BIL) and 60 kV high potential dielectrics withstand test with only 0.09% leakage inductance. Importantly, a lightning protection scheme is presented to protect the SST itself from 90 kV BIL impulse. Fourth, the proposed current-source SST topology is a modular soft-switching solid-state transformer (M-S4T) with full-range zero-voltage switching and controlled dv/dt for low electromagnetic interference. These concepts are verified in a three-port M-S4T prototype with forced oil cooling under single-module, stacked-module, steady-state, and dynamic operations. | |
| dc.description.sponsorship | This work was supported in part by ARPA-E under DE-AR0000899 and in part by the Center for Distributed Energy, Georgia Institute of Technology. | |
| dc.identifier.citation | L. Zheng et al., "7.2 kV Three-Port SiC Single-Stage Current-Source Solid-State Transformer With 90 kV Lightning Protection," in IEEE Transactions on Power Electronics, vol. 37, no. 10, pp. 12080-12094, Oct. 2022, doi: 10.1109/TPEL.2022.3172946. | |
| dc.identifier.doi | https://doi.org/10.1109/TPEL.2022.3172946 | |
| dc.identifier.uri | https://hdl.handle.net/1853/72278 | |
| dc.publisher | Georgia Institute of Technology | |
| dc.publisher.original | IEEE | |
| dc.rights.metadata | https://creativecommons.org/publicdomain/zero/1.0/ | |
| dc.subject | Solid-state transformer (SST) | |
| dc.subject | Current-source inverter (CSI) | |
| dc.subject | Current-source converter (CSC) | |
| dc.subject | High frequency link (HFL) | |
| dc.subject | Input-series output-parallel (ISOP) | |
| dc.subject | Medium-frequency transformer (MFT) | |
| dc.subject | Power electronic transformer (PET) | |
| dc.title | 7.2 kV Three-Port SiC Single-Stage Current-Source Solid-State Transformer with 90 kV Lightning Protection | |
| dc.type | Text | |
| dc.type.genre | Post-print | |
| dspace.entity.type | Publication | |
| local.contributor.author | Divan, Deepakraj M. | |
| local.contributor.corporatename | School of Electrical and Computer Engineering | |
| local.contributor.corporatename | College of Engineering | |
| relation.isAuthorOfPublication | db2b03a1-dd75-4a65-94bb-79e8197e26ea | |
| relation.isOrgUnitOfPublication | 5b7adef2-447c-4270-b9fc-846bd76f80f2 | |
| relation.isOrgUnitOfPublication | 7c022d60-21d5-497c-b552-95e489a06569 |
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