TY - GEN
T1 - An Isolated Three-Port DC-DC Converter with Low-Voltage DC Bus for DC Microgrids
AU - Wang, Panbao
AU - Zhang, Xiaochen
AU - Ding, Sibao
AU - Wang, Wei
AU - Xu, Dianguo
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/7/2
Y1 - 2018/7/2
N2 - The application of multi-port DC converters in DC microgrids (MGs) can effectively improve the integration and reliability of the system. This paper proposes an isolated three-port converter (TPC) with common low-voltage DC bus which is suitable for DC MGs. The proposed TPC is able to achieve bidirectional power transmission between the high-voltage side and the low-voltage side through the dual active bridge (DAB), while the power conversion of the low-voltage side is consisted of buck-boost converters. The number of power devices of the TPC is reduced by multiplex use of the power devices in the DAB. Meanwhile, interleaved structure is employed to reduce the current ripple at one port on low-voltage side. This paper analyzes the equivalent circuit model of the proposed TPC, then typical operating modes and key waveforms of the converter are presented. The phase-shifting control with duty-cycle adjustment method is adopted to realize bidirectional power transmission among the three ports. Finally, the power transmission characteristics of the TPC are verified by simulation and experimental studies, and the effectiveness of the proposed scheme is verified accordingly.
AB - The application of multi-port DC converters in DC microgrids (MGs) can effectively improve the integration and reliability of the system. This paper proposes an isolated three-port converter (TPC) with common low-voltage DC bus which is suitable for DC MGs. The proposed TPC is able to achieve bidirectional power transmission between the high-voltage side and the low-voltage side through the dual active bridge (DAB), while the power conversion of the low-voltage side is consisted of buck-boost converters. The number of power devices of the TPC is reduced by multiplex use of the power devices in the DAB. Meanwhile, interleaved structure is employed to reduce the current ripple at one port on low-voltage side. This paper analyzes the equivalent circuit model of the proposed TPC, then typical operating modes and key waveforms of the converter are presented. The phase-shifting control with duty-cycle adjustment method is adopted to realize bidirectional power transmission among the three ports. Finally, the power transmission characteristics of the TPC are verified by simulation and experimental studies, and the effectiveness of the proposed scheme is verified accordingly.
KW - DC microgrdis
KW - phase-shifting control
KW - power transmission
KW - three-port converter
UR - http://www.scopus.com/inward/record.url?scp=85062855165&partnerID=8YFLogxK
U2 - 10.1109/SPEC.2018.8636080
DO - 10.1109/SPEC.2018.8636080
M3 - Conference contribution
AN - SCOPUS:85062855165
T3 - 2018 IEEE 4th Southern Power Electronics Conference, SPEC 2018
BT - 2018 IEEE 4th Southern Power Electronics Conference, SPEC 2018
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 4th IEEE Southern Power Electronics Conference, SPEC 2018
Y2 - 10 December 2018 through 13 December 2018
ER -