- Researchers at the National University of Singapore have developed an optimization model for PV-powered green hydrogen facilities that can evaluate different options for each technology.
The scientists said in “Green hydrogen from solar power for decarbonization: What will it cost?,” which was recently published in Energy Conversion Management, that their model incorporates solar irradiance, physical hydrogen storage, land footprint, power grid carbon intensity, and various factors including project type, size, capital and operating costs, efficiencies, and lifespans. They also said that in the current technology landscape, an LCOH of less than $10/kg will be needed to make green hydrogen compete with gray, blue, and orange hydrogen.
“The model accounts for the impact of intra-day and inter-day variations in renewable electricity generation by considering the solar irradiance data at a fine granularity,” they said, noting that it also allows for an import from and export to the local electrical grid. “The model enables an option to install batteries for storing and utilizing renewable electrons. Similarly, it also considers the storage of hydrogen molecules to manage hydrogen demand.”
The model considers a green hydrogen facility with a PV plant, electrolyzer, battery storage, buffer tanks, and a pumping station for hydrogen supply, and incorporates the facility’s ability to trade power with the grid as necessary.
“The main challenge in designing this facility is to use the transient and uncertain solar irradiance optimally to satisfy hydrogen demand at the least expense,” the scientists emphasized. “The model is employed to obtain the optimal facility design that yields cheapest green hydrogen under different geographical and techno-economic conditions.”