h1

TY  - THES
AU  - Cui, Shenghui
TI  - Modular multilevel DC-DC converters interconnecting high-voltage and medium-voltage DC grids; 1. Auflage
VL  - 68
PB  - RWTH Aachen University
VL  - Dissertation
CY  - Aachen
M1  - RWTH-2019-05892
SN  - 978-3-942789-67-7
T2  - E.ON Energy Research Center : PGS, Power Generation and Storage Systems
SP  - 1 Online-Ressource (vi, 124 Seiten) : Illustrationen, Diagramme
PY  - 2019
N1  - Veröffentlicht auf dem Publikationsserver der RWTH Aachen University
N1  - Dissertation, RWTH Aachen University, 2019
AB  - This dissertation proposes an isolated bi-directional soft-switching dc-dc converter for interconnection of medium-voltage (MV) dc distribution grids and high-voltage (HV) dc transmission grids. The proposed converter combines parallel-connected two-level converters (TLCs) on the MV side and a modular multilevel converter (MMC) on the HV side, and it is named the TLC-MMC converter. A dedicated operation method of the TLC-MMC converter is developed, whereby a certain reactive current is injected into the MV side by the MMC to realize soft-switching operation and low total device ratings of power-semiconductor devices (PSDs) in the TLCs on the MV side. Compared to the existing topologies dedicated to this application, the TLC-MMC converter presents significantly reduced active and passive components and lower PSD losses over a wide power range at variable input and output voltages. The topics on topology, control, and fault-tolerant operation of the TLC-MMC converter are covered in this dissertation with simulations and experimental verifications by a down-scale prototype.
LB  - PUB:(DE-HGF)11 ; PUB:(DE-HGF)3
DO  - DOI:10.18154/RWTH-2019-05892
UR  - https://publications.rwth-aachen.de/record/762795
ER  -