Current researches on advanced adiabatic compressed air energy storage(AA-CAES) systems primarily focus on optimizing designs and analyzing performance under off-design conditions based on fixed system structures
with limited attention to system-level optimization involving predefined operational modes. By taking a 300 MW-class asymmetric AA-CAES system featuring four-stage compression and three-stage expansion as the object
a novel variable-pressure(sliding-pressure) operation strategy is proposed
along with a matching design between compression and expansion stages. A quasi-dynamic thermodynamic model is developed to analyze and optimize the full charge-discharge cycle performance under fixed time constraints with sliding-pressure control. The results show that the optimized sliding-pressure mode improves the system's round-trip efficiency to 73.32%
incr
eases the energy density to 3.404 kW·h/m
3
and reduces the required air storage volume to 440 000 m
3
(only one-fourth of that under constant-pressure operation). Exergy losses are mainly concentrated in the compressors and turbines
accounting for 40.7% and 29.3% respectively. The isentropic efficiency and heat recovery capability of these components have significant influence on overall performance of the system.
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references
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