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摘要
The typical advanced adiabatic compressed air energy storage (AA-CAES) system has a narrow input power range because of the compressor working stability, and thus it is unsuitable for unstable power source-side energy storage. An isobaric adiabatic compressed air energy storage system integrated with power-thermal combined storage (PT-IA-CAES) is proposed to cope with fluctuant input power. When the external input power is lower than the compressor startup power, thermal storage system starts to operate, realizing large and continuous energy storage range. The design method and operating rules of the system are expounded. The energy storage/release characteristic curves are obtained by constructing the system components and the overall off-design model. The case study shows that the cycle efficiencies of isobaric adiabatic compressed air energy storage (IA-CAES) system and PT-IA-CAES system at power source-side are 69.60% and 66.80%, respectively, lower than that of AA-CAES (71.83%). However, the wind curtailment rate decreases from 4.121% to 1.168% and 0.405%, respectively, and the total released energy increases by 48,594.33MJ and 52,137.07 MJ, respectively, indicating that the design system has obvious advantages in dealing with unstable power input. ?2023 Chin.Soc.for Elec.Eng.
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