Comparison of Modular Multilevel Converter Based Solid State Transformer for AC/DC Application

Conference paper (2023)

Authors

Z. Li DC systems, Energy conversion & Storage - EEMCS
Z. Qin DC systems, Energy conversion & Storage - EEMCS
R. Mirzadarani High Voltage Technology Group - EEMCS
M. Ghaffarian Niasar High Voltage Technology Group - EEMCS
M.S. Itraj Vonk, Electrical Engineering, Mathematics and Computer Science
P. Bauer DC systems, Energy conversion & Storage - EEMCS
Research Group
DC systems, Energy conversion & Storage (EEMCS) (TU Delft)
Solid State Transformer Modular Multilevel Converter Electrolyzer
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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

DC systems, Energy conversion & Storage

Abstract

For electrolyzer applications, traditional solutions using line frequency transformers plus rectifiers are bulky, heavy and have low controllability. The Solid State Transformer (SST) could be a promising solution to solve the mentioned issues. This paper compares the semiconductor ratings and capacitance of five different Modular Multilevel Converter (MMC) based Solid State Transformer (SST) topologies. The results show that the DRU (Diode Rectifier Unit)-MMC based topologies have the lowest semiconductor ratings and capacitance. Because of the unidirectional power flow requirement, the source side MMC of Back-to-Back (BtB) MMC based SST could be replaced by DRU, thus the cost is drastically saved. Another interesting finding is that the DRU-MMC energy ripple is much lower than half of the energy ripple in BtB MMC, which is different from HVDC MMC.