A Hybrid Modular DC Solid State Transformer Combining High Efficiency and Control Flexibility

Y. Sun, Z. Gao, C. Fu, C. Wu, Z. Chen

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Abstract

This paper presents a hybrid modular dc solid state transformer (HMDCSST) composed of a series resonant-dual active bridge (SR-DAB) and a phase shift-dual active bridge (PS-DAB), aiming at improving the transfer efficiency as well as maintaining the control flexibility. The key problems in terms of modeling and control strategy are discussed in the paper. The generalized average and small signal models of the HMDCSST are derived and confirmed by simulation, in which two LC filters are also considered to reduce the ripple components of the input and output currents. Based on the models, the control strategies to achieve flexible control of the output voltage and power are designed. Moreover, as a key problem for HMDCSST, the design principle of the number for each type of DAB is discussed to meet the demands of the grid. Finally, a three-module prototype of HMDCSST consisting of one PS-DAB and two SR-DAB modules was built-up and tested, and the results proved that HMDCSST has higher efficiency than the traditional DCSST based on PS-DABs purely, without sacrificing the output voltage and power regulating capability in the meanwhile.
Original languageEnglish
JournalIEEE Transactions on Power Electronics
ISSN0885-8993
DOIs
Publication statusE-pub ahead of print - 2020

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@article{68e6f9dc63e34880a1b336c1790b1a74,
title = "A Hybrid Modular DC Solid State Transformer Combining High Efficiency and Control Flexibility",
abstract = "This paper presents a hybrid modular dc solid state transformer (HMDCSST) composed of a series resonant-dual active bridge (SR-DAB) and a phase shift-dual active bridge (PS-DAB), aiming at improving the transfer efficiency as well as maintaining the control flexibility. The key problems in terms of modeling and control strategy are discussed in the paper. The generalized average and small signal models of the HMDCSST are derived and confirmed by simulation, in which two LC filters are also considered to reduce the ripple components of the input and output currents. Based on the models, the control strategies to achieve flexible control of the output voltage and power are designed. Moreover, as a key problem for HMDCSST, the design principle of the number for each type of DAB is discussed to meet the demands of the grid. Finally, a three-module prototype of HMDCSST consisting of one PS-DAB and two SR-DAB modules was built-up and tested, and the results proved that HMDCSST has higher efficiency than the traditional DCSST based on PS-DABs purely, without sacrificing the output voltage and power regulating capability in the meanwhile.",
keywords = "Hybrid modular dc solid state transformer, phase shift-dual active bridge, series resonant-dual active bridge, small signal modelling, control strategy",
author = "Y. Sun and Z. Gao and C. Fu and C. Wu and Z. Chen",
year = "2020",
doi = "10.1109/TPEL.2019.2935029",
language = "English",
journal = "I E E E Transactions on Power Electronics",
issn = "0885-8993",
publisher = "IEEE",

}

A Hybrid Modular DC Solid State Transformer Combining High Efficiency and Control Flexibility. / Sun, Y.; Gao, Z.; Fu, C.; Wu, C.; Chen, Z.

In: IEEE Transactions on Power Electronics, 2020.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - A Hybrid Modular DC Solid State Transformer Combining High Efficiency and Control Flexibility

AU - Sun, Y.

AU - Gao, Z.

AU - Fu, C.

AU - Wu, C.

AU - Chen, Z.

PY - 2020

Y1 - 2020

N2 - This paper presents a hybrid modular dc solid state transformer (HMDCSST) composed of a series resonant-dual active bridge (SR-DAB) and a phase shift-dual active bridge (PS-DAB), aiming at improving the transfer efficiency as well as maintaining the control flexibility. The key problems in terms of modeling and control strategy are discussed in the paper. The generalized average and small signal models of the HMDCSST are derived and confirmed by simulation, in which two LC filters are also considered to reduce the ripple components of the input and output currents. Based on the models, the control strategies to achieve flexible control of the output voltage and power are designed. Moreover, as a key problem for HMDCSST, the design principle of the number for each type of DAB is discussed to meet the demands of the grid. Finally, a three-module prototype of HMDCSST consisting of one PS-DAB and two SR-DAB modules was built-up and tested, and the results proved that HMDCSST has higher efficiency than the traditional DCSST based on PS-DABs purely, without sacrificing the output voltage and power regulating capability in the meanwhile.

AB - This paper presents a hybrid modular dc solid state transformer (HMDCSST) composed of a series resonant-dual active bridge (SR-DAB) and a phase shift-dual active bridge (PS-DAB), aiming at improving the transfer efficiency as well as maintaining the control flexibility. The key problems in terms of modeling and control strategy are discussed in the paper. The generalized average and small signal models of the HMDCSST are derived and confirmed by simulation, in which two LC filters are also considered to reduce the ripple components of the input and output currents. Based on the models, the control strategies to achieve flexible control of the output voltage and power are designed. Moreover, as a key problem for HMDCSST, the design principle of the number for each type of DAB is discussed to meet the demands of the grid. Finally, a three-module prototype of HMDCSST consisting of one PS-DAB and two SR-DAB modules was built-up and tested, and the results proved that HMDCSST has higher efficiency than the traditional DCSST based on PS-DABs purely, without sacrificing the output voltage and power regulating capability in the meanwhile.

KW - Hybrid modular dc solid state transformer

KW - phase shift-dual active bridge

KW - series resonant-dual active bridge

KW - small signal modelling

KW - control strategy

U2 - 10.1109/TPEL.2019.2935029

DO - 10.1109/TPEL.2019.2935029

M3 - Journal article

JO - I E E E Transactions on Power Electronics

JF - I E E E Transactions on Power Electronics

SN - 0885-8993

ER -