Three-Phase Medium-Voltage Medium-Frequency Transformer for SST in Green Hydrogen Production

Conference paper (2023)

Authors

R. Mirzadarani High Voltage Technology Group -

M. Ghaffarian Niasar High Voltage Technology Group -

Z. Li DC systems, Energy conversion & Storage -

Z. Qin DC systems, Energy conversion & Storage -

P.T.M. Vaessen High Voltage Technology Group -

P. Bauer DC systems, Energy conversion & Storage -

Lou Van Lieshout Vonk

Research Group

High Voltage Technology Group () (TU Delft)

DOI: https://doi.org/10.1109/IECON51785.2023.10312546

Electrolyzer Solid-state transformer Mediumfrequency transformer

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Published Date

2023

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

High Voltage Technology Group

Abstract

Green hydrogen production uses renewable energies to energise the electrolysers for hydrogen production. The present paper compares possible solutions and configurations of a medium-frequency transformer (MFT) as part of a solid-state transformer (SST) in green hydrogen production applications. The single-phase and three-phase MFTs are compared and it is shown that a Yd three-phase MFT is the optimum choice for applications that require high power delivery and step-down of the voltage. A summary of previous works about MFT is also provided. Three-phase SST based on modular multilevel converters (MMC) is then described and various cases are investigated to obtain the optimum operational frequency. A 25 MVA, 400 Hz, 25.4 kV / 560V oil-immersed MFT design is presented and is shown that the proposed 400 Hz transformer saves 69% of the active parts' weight compared to a conventional line-frequency transformer (LFT).

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