A typical scenario for the proposed PV-LAES system. Researchers from the Sichuan Normal University in China and the University of Cambridge in the UK have investigated the techno-economic feasibility of a new hybrid system integrating photovoltaics and liquid-air energy storage (LAES).
The system’s energy storage duration at the off-peak time is 9.13 hours, and the energy release duration at peak time is 6.27 hours. For the proposed PV-LAES project, results show that the surplus renewable electricity of 6.73 MWh sent to LAES is used for generating 27.12 tons of liquid air for energy backups during the daytime.
However, the implementation of this solution requires a suitable energy storage method. Liquid Air Energy Storage (LAES) has emerged as a promising energy storage method due to its advantages of large-scale, long-duration energy storage, cleanliness, low carbon emissions, safety, and long lifespan.
The LAES unit utilizes surplus power from the PV plant and compensates power for the local load with an inadequate power level. The system’s energy storage duration at the off-peak time is 9.13 hours, and the energy release duration at peak time is 6.27 hours.
Regarding the economic performance, the PV-LAES system presents a dynamic payback period of 9.33 years and an accumulated life-cycle net profit of $2,260,011, the researchers found. They discussed their findings in “ Hybrid photovoltaic-liquid air energy storage system for deep decarbonization ” published in Energy Science and Engineering.
For the proposed PV-LAES project, results show that the surplus renewable electricity of 6.73 MWh sent to LAES is used for generating 27.12 tons of liquid air for energy backups during the daytime. There, the LAES unit has a round-trip efficiency of 47.4% and can discharge a flexible power compensation to the load in the night.
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