Three-Phase Medium-Voltage Medium-Frequency Transformer for SST in Green Hydrogen Production
Reza Mirzadarani (TU Delft - High Voltage Technology Group)
M. Ghaffarian Niasar (TU Delft - High Voltage Technology Group)
Zhengzhao Li (TU Delft - DC systems, Energy conversion & Storage)
Zian Qin (TU Delft - DC systems, Energy conversion & Storage)
Peter Vaessen (TU Delft - High Voltage Technology Group)
Pavol Bauera (TU Delft - DC systems, Energy conversion & Storage)
Lou Van Lieshout (Vonk)
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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).