Scientists at the Italian University of Cagliari investigated the integration of a water electrolyzer with a floating PV-pumped Hydro energy storage system. They discovered that hydrogen production has helped under high conversion to stabilize system efficiency and to lower the level of electricity compared to a system without the electrolyzer.
Researchers from the Italian University of Cagliari have studied the integration of a water electrolyzer in a floating PV-pumped Hydro Energy Storage (FPV-PHES) system, causing the efficiency of the system and level of electricity (LCOE) (LCOE) (LCOE) (LCOE) (LCOE) (LCO) are analyzed.
The results appear in the research paper Green hydrogen generation for softening the impact of limitation on floating photovoltaic-pumped hydro energy storage (FPV-PHES) systemsPublished in the Journal of Energy Storage.
“The novelty of our work is to show that the technical and economic issues caused by high renewable penetration also influence hybrid plants such as FPV pthes if they are not collected by declaring the defendants,” told the corresponding author Luca Migliari to PV -Magazine. “By integrating a very flexible component, such as an electrolyzer, these risks can be limited because electricity other-known electricity is converted into green hydrogen and leveled costs are largely independent of limitation conditions.”
The simulation was based on a Phes system installed on the Italian island of Sardinia. It included a Francis turbine, four 1,205 MW pumps and two 0.627 MW pumps. Het bovenste reservoir bevindt zich op een hoogte van 55,45 m tot 118 m, met het lagere reservoir op een hoogte van 38 m tot 45 m. Aangenomen wordt dat het werkt onder een typisch meteorologisch jaar (TMY) voor sardinië, gekenmerkt door een gemiddelde en maximale globale bestraling (GI) van respectievelijk 0,2 kW/m2 en 1,1 kW/m2, en een jaarlijkse globale bestraling van 1.758 kWh/m2.
The floating PV -Array used in the system has 500 W modules with a tilt of 10Z. The total capacity of the FPV system varied from 0 MW to 25 MW in the study, with 25 MW the most important case study. Together with the PHEs, this system was checked under two schedules scenarios. The first saw all the excess FPV energy that was led to the grid, while nothing was entered in the grid in the other scenario.
The study also tested the adding of an anion exchange membrane (AEM) with a capacity of 0-20 MW to the system, under the same grid scenarios. In the case study, the AEM size was around 15 MW. The PV energy management system priority gives priority to the first Phe’s, then the AEM and finally the grid, if permitted.
Migliari said that the most striking finding was the dramatic contrast between scenarios. “Without the electrolyzer, the efficiency can collapse to 24% and the LCOE rises to $ 280/MWH under high restrictions conditions. With the Electrolyzer, efficiency stabilizes at 61%, LCOE at $ 145/m” This shows that hydrogen production not only protects an extra valuable output. “
Migliari added that his research group will continue to investigate strategies to reduce the defendant risks from both a technical perspective and a market perspective. “On the technical side we study various hybridization and storage options. On the market side we analyze how electricity and hydrogen price formation, as well as income from flexibility services, can improve the profitability of PV-hybrid systems,” he explained.
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