TY - UNPB
T1 - Medium Voltage Dc Systems for Rapid Electric Vehicle Charging
AU - Deb, Arkadeep
AU - Ortiz Gonzalez, Jose
AU - Jahdi, Saeed
AU - Issa, Walid
AU - Alatise, Olayiwola
PY - 2023/6/15
Y1 - 2023/6/15
N2 - Accelerated electrification of automotive transportation means increased power demand in distribution systems with EV charging stations demanding MW level power. This requires costly distribution transformer and switch-gear reinforcement, which can be costly and disruptive. This paper proposes a 54kV MVDC system to bypass the 33kV/11kV and 11kV/0.4kV AC-transformers. By aggregating all the rectification at the 33kV and using isolated DC/DC converters (with ZVS on all primary switches), a high-power density and high-efficiency EV charging station is realized. MVDC transmission has added benefits of reduced transmission losses, easy integration of PV/battery storage and soft-open-point functionality. In this paper, a 1 MW charging station is considered. Loss comparison is performed between the scenarios of (1) using the existing AC network with upgraded 50 Hz transformers meaning rectification and DC/DC conversion at 400V (2) using a 54 kV MVDC transmission with modular-multilevel-converters. Using clamped inductive switching circuits, experimental measurements of switching energies have been performed on 650 V and 1200 V SiC MOSFETs, IGBTs and Cascode JFETs at different temperatures. The measurements are used to parameterize simulations of Vienna rectifiers and DC/DC converters to quantify converter efficiency. The results show the importance of SiC-MOSFETs in the prospective MVDC systems for ultra-fast EV charging.
AB - Accelerated electrification of automotive transportation means increased power demand in distribution systems with EV charging stations demanding MW level power. This requires costly distribution transformer and switch-gear reinforcement, which can be costly and disruptive. This paper proposes a 54kV MVDC system to bypass the 33kV/11kV and 11kV/0.4kV AC-transformers. By aggregating all the rectification at the 33kV and using isolated DC/DC converters (with ZVS on all primary switches), a high-power density and high-efficiency EV charging station is realized. MVDC transmission has added benefits of reduced transmission losses, easy integration of PV/battery storage and soft-open-point functionality. In this paper, a 1 MW charging station is considered. Loss comparison is performed between the scenarios of (1) using the existing AC network with upgraded 50 Hz transformers meaning rectification and DC/DC conversion at 400V (2) using a 54 kV MVDC transmission with modular-multilevel-converters. Using clamped inductive switching circuits, experimental measurements of switching energies have been performed on 650 V and 1200 V SiC MOSFETs, IGBTs and Cascode JFETs at different temperatures. The measurements are used to parameterize simulations of Vienna rectifiers and DC/DC converters to quantify converter efficiency. The results show the importance of SiC-MOSFETs in the prospective MVDC systems for ultra-fast EV charging.
UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-85162667189&partnerID=MN8TOARS
U2 - 10.2139/ssrn.4480108
DO - 10.2139/ssrn.4480108
M3 - Preprint
SP - 1
EP - 10
BT - Medium Voltage Dc Systems for Rapid Electric Vehicle Charging
PB - SSRN
ER -