Optimized method for photovoltaic-water electrolyser direct coupling

R. García-Valverde, Nieves Espinosa Martinez, A. Urbina

Research output: Contribution to journalConference articleResearchpeer-review


Photovoltaics and electrolyser coupling is one of the most promising options for obtaining hydrogen from a renewable energy source. Both are well known technologies and direct coupling is possible; however, due to high variability of the solar radiation, an efficient relative sizing still presents some challenges. In fact, relative sizing is always a key issue when coupling renewable electric sources to water electrolysers. Few previous works addressed the relative sizing and an easy and efficient method is still missing. This work presents a new method for relative sizing between both components based on simple modelling of both polarisation curves. Modelling and simulation is used for extracting a cloud of maximum power points at all the radiation and temperature conditions for a normalised PV generator. Then, the ideal ratio between the size of components is obtained by fitting a normalised polarisation curve for the electrolyser to this cloud of maximum power points. PV generator and PEM electrolyser models are proposed and the method is applied, as example, to two different PEM water electrolysers. The method helps the relative sizing issue for designing solar hydrogen production systems based on water electrolysis, because it is derived from manufacturer parameters and the used of uncomplicated numerical methods.
Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Issue number17
Pages (from-to)10574-10586
Publication statusPublished - 2011
Externally publishedYes
EventInternational Conference on Hydrogen Production 2010 (ICH2P) - Istanbul Technical University, Istanbul, Turkey
Duration: 16 Jun 201018 Jun 2010


ConferenceInternational Conference on Hydrogen Production 2010 (ICH2P)
LocationIstanbul Technical University

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