Fractional Charging Converter with High Efficiency and Low Cost for Electrochemical Energy Storage Devices

Maria del Carmen Mira Albert, Zhe Zhang, Kasper Lüthje Jørgensen, Michael A. E. Andersen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

High efficiency and low cost power converters for interfacing energy storage have become critical in renewable energy systems. In this paper a fractional charging converter (FCC) is proposed to reduce power rating as well as cost of the dcdc converter for hydrogen production by alkaline electrolyzer cells. The FCC configuration only processes the partial power resulting from the voltage difference between the source and the energy storage element. Moreover, the converter employed in such configuration can be either isolated or non-isolated, which simplifies topology selection. An analysis and comparison of two dcdc topologies using a high-frequency transformer based on component stress factor (CSF) is performed to determine the optimal solution for the evaluated application. Based on the results of the CSF analysis, and due to its capability of handling wide input voltage, the isolated full-bridge boost (IFBB) converter is designed, built and tested. Experimental results prove the feasibility of the fractional charging configuration with a reduction of 80% of the power rating compared to the traditional interconnection, which implies a reduction in cost, weight and an increase in efficiency. The converter’s maximum voltage gain achieved is 25 and the highest ½½½measured system efficiency is 98.2 %.
Original languageEnglish
JournalI E E E Transactions on Industry Applications
Volume55
Issue number6
Pages (from-to)7461-7470
Number of pages10
ISSN0093-9994
DOIs
Publication statusPublished - 2019

Keywords

  • Energy storage
  • Converter
  • Fractional
  • Electrolysis

Cite this

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title = "Fractional Charging Converter with High Efficiency and Low Cost for Electrochemical Energy Storage Devices",
abstract = "High efficiency and low cost power converters for interfacing energy storage have become critical in renewable energy systems. In this paper a fractional charging converter (FCC) is proposed to reduce power rating as well as cost of the dcdc converter for hydrogen production by alkaline electrolyzer cells. The FCC configuration only processes the partial power resulting from the voltage difference between the source and the energy storage element. Moreover, the converter employed in such configuration can be either isolated or non-isolated, which simplifies topology selection. An analysis and comparison of two dcdc topologies using a high-frequency transformer based on component stress factor (CSF) is performed to determine the optimal solution for the evaluated application. Based on the results of the CSF analysis, and due to its capability of handling wide input voltage, the isolated full-bridge boost (IFBB) converter is designed, built and tested. Experimental results prove the feasibility of the fractional charging configuration with a reduction of 80{\%} of the power rating compared to the traditional interconnection, which implies a reduction in cost, weight and an increase in efficiency. The converter’s maximum voltage gain achieved is 25 and the highest ½½½measured system efficiency is 98.2 {\%}.",
keywords = "Energy storage, Converter, Fractional, Electrolysis",
author = "{Mira Albert}, {Maria del Carmen} and Zhe Zhang and J{\o}rgensen, {Kasper L{\"u}thje} and Andersen, {Michael A. E.}",
year = "2019",
doi = "10.1109/TIA.2019.2921295",
language = "English",
volume = "55",
pages = "7461--7470",
journal = "I E E E Transactions on Industry Applications",
issn = "0093-9994",
publisher = "Institute of Electrical and Electronics Engineers",
number = "6",

}

Fractional Charging Converter with High Efficiency and Low Cost for Electrochemical Energy Storage Devices. / Mira Albert, Maria del Carmen; Zhang, Zhe; Jørgensen, Kasper Lüthje; Andersen, Michael A. E.

In: I E E E Transactions on Industry Applications, Vol. 55, No. 6, 2019, p. 7461-7470.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Fractional Charging Converter with High Efficiency and Low Cost for Electrochemical Energy Storage Devices

AU - Mira Albert, Maria del Carmen

AU - Zhang, Zhe

AU - Jørgensen, Kasper Lüthje

AU - Andersen, Michael A. E.

PY - 2019

Y1 - 2019

N2 - High efficiency and low cost power converters for interfacing energy storage have become critical in renewable energy systems. In this paper a fractional charging converter (FCC) is proposed to reduce power rating as well as cost of the dcdc converter for hydrogen production by alkaline electrolyzer cells. The FCC configuration only processes the partial power resulting from the voltage difference between the source and the energy storage element. Moreover, the converter employed in such configuration can be either isolated or non-isolated, which simplifies topology selection. An analysis and comparison of two dcdc topologies using a high-frequency transformer based on component stress factor (CSF) is performed to determine the optimal solution for the evaluated application. Based on the results of the CSF analysis, and due to its capability of handling wide input voltage, the isolated full-bridge boost (IFBB) converter is designed, built and tested. Experimental results prove the feasibility of the fractional charging configuration with a reduction of 80% of the power rating compared to the traditional interconnection, which implies a reduction in cost, weight and an increase in efficiency. The converter’s maximum voltage gain achieved is 25 and the highest ½½½measured system efficiency is 98.2 %.

AB - High efficiency and low cost power converters for interfacing energy storage have become critical in renewable energy systems. In this paper a fractional charging converter (FCC) is proposed to reduce power rating as well as cost of the dcdc converter for hydrogen production by alkaline electrolyzer cells. The FCC configuration only processes the partial power resulting from the voltage difference between the source and the energy storage element. Moreover, the converter employed in such configuration can be either isolated or non-isolated, which simplifies topology selection. An analysis and comparison of two dcdc topologies using a high-frequency transformer based on component stress factor (CSF) is performed to determine the optimal solution for the evaluated application. Based on the results of the CSF analysis, and due to its capability of handling wide input voltage, the isolated full-bridge boost (IFBB) converter is designed, built and tested. Experimental results prove the feasibility of the fractional charging configuration with a reduction of 80% of the power rating compared to the traditional interconnection, which implies a reduction in cost, weight and an increase in efficiency. The converter’s maximum voltage gain achieved is 25 and the highest ½½½measured system efficiency is 98.2 %.

KW - Energy storage

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