A1 Journal article (refereed), original research

Power quality estimation of water electrolyzers based on current and voltage measurements


Open Access publication

Publication Details
Authors: Ruuskanen Vesa, Koponen Joonas, Kosonen Antti, Hehemann Michael, Keller Roger, Niemelä Markku, Ahola Jero
Publisher: Elsevier
Publication year: 2020
Language: English
Related Journal or Series Information: Journal of Power Sources
Volume number: 450
ISSN: 0378-7753
eISSN: 1873-2755
JUFO-Level of this publication: 2
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe202002044407

Abstract

The ripple of the supplied direct current has a significant effect on
the energy efficiency of the water electrolyzer cell. Hydrogen
production is defined by the current mean value, but current harmonics
generate additional losses in the electrolyzer cell. However, the direct
measurement of the DC current in the kiloampere range may be a
challenging task compared with the voltage, which is practically in the
range of a few hundreds volts in the electrolyzer stack. The effect of
current harmonics on the energy efficiency and the voltage mean and
root-mean-square (RMS) values is analyzed analytically based on the
measured polarization curve of the PEM electrolyzer cell. The results
show that both in the case of a theoretical sinusoidal current ripple
and a practical thyristor bridge supply, the voltage mean or RMS values
do not give a reliable estimate of the power quality. Instead, the
voltage waveform as a function of time or the difference between the
current mean and RMS values should be monitored.


Last updated on 2020-23-03 at 12:05

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