Abstract
Adiabatic compressed air energy storage provides an efficient and emission free approach for large-scale energy storage. In adiabatic compressed air energy storage system with isochoric air storage tank, the throttle valves cause large exergy losses. To reduce throttling loss, a novel system is proposed by regulating the discharging pressure with an inverter-driven air compressor. Variable- and constant-output power operation modes of the novel system are proposed and studied from the aspects of exergy, economic and dynamic characteristic analysis. Furthermore, parametric analysis of the novel system is conducted from the perspective of the system discharge total output power, inverter-driven compressor efficiency and equipment purchase cost. The results indicate that for the novel system, the round-trip efficiency is improved by 1.8–2.7%, and the levelized cost of electricity decreases by 0.57–0.85 ¢/kWh. Hence, the proposed novel system is verified an effective way for adiabatic compressed air energy storage system optimization.
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