Reduced-Order DC Terminal Dynamic Model for Multi-Port AC-DC Power Electronic Transformer

Zhe Wang, Yaohua Li, Zixin Li, Cong Zhao, Fanqiang Gao and Ping Wang
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Zhe Wang: Key Laboratory of Power Electronics and Electric Drive, Institute of Electrical Engineering Chinese Academy of Sciences, Haidian District, Beijing 100190, China
Yaohua Li: Key Laboratory of Power Electronics and Electric Drive, Institute of Electrical Engineering Chinese Academy of Sciences, Haidian District, Beijing 100190, China
Zixin Li: Key Laboratory of Power Electronics and Electric Drive, Institute of Electrical Engineering Chinese Academy of Sciences, Haidian District, Beijing 100190, China
Cong Zhao: Key Laboratory of Power Electronics and Electric Drive, Institute of Electrical Engineering Chinese Academy of Sciences, Haidian District, Beijing 100190, China
Fanqiang Gao: Key Laboratory of Power Electronics and Electric Drive, Institute of Electrical Engineering Chinese Academy of Sciences, Haidian District, Beijing 100190, China
Ping Wang: Key Laboratory of Power Electronics and Electric Drive, Institute of Electrical Engineering Chinese Academy of Sciences, Haidian District, Beijing 100190, China

Energies, 2019, vol. 12, issue 11, 1-16

Abstract: As new electric power conversion equipment, a multi-port power electronic transformer (MP-PET), including a power electronic converter, high-frequency transformer, and multiple ac or dc interconnection interfaces, has a broad application in the hybrid distribution network. However, high integration and a large number of energy storage devices has led to very a high-order model of the system. To address this issue, a reduced-order small signal model of MP-PET is established in this paper. By taking the participation factors of the system mode to the state variables, the reduced-order model is derived based on the state variables, which are highly correlated with the dc voltage dominant mode. Compared with the full-order model, the proposed reduced-order model is accurate enough and simplified, and the validity of the simplified model is verified against simulations on a 10 kV/3 MVA MP-PET. The simulation results indicate that the proposed reduced-order model coincides well with the dynamic performance of the MP-PET.

Keywords: multi-port cascaded H-bridge power electronic transformer; reduced-order small signal model; participation factor; modal analysis; stability analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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