| Exploitation of the traditional energy sources has brought a series of problem, such as exhaustion of natural resources and ecological destruction, to which a various kinds of new energy are promising solutions. However, the new energy powers, such as wind power and solar power, are born with characteristics of intermittent and volatility and this makes it difficult for the power to integrate with the power grid. On the other hand, with the development of electricity, the requirement for peak-shaving gets more rigorous and that impose a bad effect on the efficiency of power stations for peak regulation. On this condition, large-scale power storage station may act as one of the best solutions for the problem above. Among the various kinds of energy storage technologies, compressed air energy storage(CAES) has get a lot of attention for its large scale, high efficiency and reliability. Currently, the traditional CAES technology have been commercialized successfully, with a characteristic of combustion of natural gas and emission of CO2, for which a new kinds of CAES system, advanced adiabatic compressed air energy storage system(AA-CAES) had been proposed. AA-CAES systems collect the heat from the compression process, getting rid of the relying on natural gas and avoiding emitting CO2. Until now, the AA-CAES technology has been seen as the most marketably potential.New conceptual AA-CAES systems based on liquid energy-storage medium and solid energy-storage medium are proposed and the thermodynamic analysis models for them are presented. As for the AA-CAES system based on liquid medium, the effect of some key parameters, such as air chamber pressure, compression/expansion stage number and heat exchanger pressure loss, on the system performance. An optimizing calculation is conducted for the highest cycle efficiency. As for the AA-CAES system based on solid medium, the temperature changing process is illustrated in detail and a method is proposed to improve the system performance. To increase the power storage capacity, a sort of hybrid energy storage system is proposed with 2 configuration schemes, between which a contrastive analysis is conducted. At last, a comparison between the two kinds of energy storage systems is conducted. |
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