Robust Circuit Parameters Design for the CLLC-Type DC Transformer in the Hybrid AC-DC Microgrid

CLLC-type dc transformer (CLLC-DCT) is very popular in the hybrid ac-dc microgrid thanks to its high-power density advantage and good bidirectional power transfer capacity. In the hybrid ac/dc microgrid, the open-loop control is always utilized by the CLLC-DCT to cooperate with the bidirectional int...

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Bibliographic Details
Published inIEEE transactions on industrial electronics (1982) Vol. 66; no. 3; pp. 1906 - 1918
Main Authors Huang, Jingjing, Zhang, Xin, Shuai, Zhikang, Zhang, Xinan, Wang, Peng, Koh, Leong Hai, Xiao, Jianfang, Tong, Xiangqian
Format Journal Article
LanguageEnglish
Published New York IEEE 01.03.2019
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Capacitors
Circuit design
CLLC
Data buses
dc transformer
Design
Design parameters
Discrete cosine transforms
Distributed generation
Electric converters
Electric potential
Electric power distribution
hybrid ac/dc microgrid
Hybrid power systems
Inductors
Load flow
Microgrids
Parameter robustness
Power transfer
Robust design
robust parameters design
Robustness
Topology
Transformers
Voltage control
voltage conversion gain (VCG)
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Summary:CLLC-type dc transformer (CLLC-DCT) is very popular in the hybrid ac-dc microgrid thanks to its high-power density advantage and good bidirectional power transfer capacity. In the hybrid ac/dc microgrid, the open-loop control is always utilized by the CLLC-DCT to cooperate with the bidirectional interlinking converter to realize the power and voltage conversion between the ac and dc bus. This paper first studies the circuit parameters design of the open-loop controlled CLLC-DCT with consideration of such a realistic problem: The real inductors/capacitors values are actually different with their theoretically designed values due to the operation power and temperature variation. To solve this problem, a robust circuit parameters design scheme is proposed for the CLLC-DCT in this paper. With the proposed scheme, the designed CLLC-DCT exhibits good power transmission and voltage regulation ability in the hybrid ac/dc microgrid even when its actual inductors/capacitors values vary with the practical power and temperature. The robust design method is experimentally verified in a hybrid ac/dc microgrid prototype.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2018.2835373