Power quality estimation of water electrolyzers based on current and voltage measurements
Ruuskanen, Vesa; Koponen, Joonas; Kosonen, Antti; Hehemann, Michael; Keller, Roger; Niemelä, Markku; Ahola, Jero (2019-12-23)
Post-print / Final draft
Ruuskanen, Vesa
Koponen, Joonas
Kosonen, Antti
Hehemann, Michael
Keller, Roger
Niemelä, Markku
Ahola, Jero
23.12.2019
Journal of Power Sources
450
Elsevier
School of Energy Systems
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe202002044407
https://urn.fi/URN:NBN:fi-fe202002044407
Tiivistelmä
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.
Lähdeviite
Ruuskanen, V., Koponen, J., Kosonen, A., Hehemann, M., Keller, R., Niemelä, M., Ahola, J. (2020). Power quality estimation of water electrolyzers based on current and voltage measurements. Journal of Power Sources, vol. 450. DOI: 10.1016/j.jpowsour.2019.227603
Alkuperäinen verkko-osoite
https://www.sciencedirect.com/science/article/pii/S0378775319315964?via%3DihubKokoelmat
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