| ABSTRACT:Compressed air energy storage (CAES) system is a mature energy storage method gradually. Because of its free-pollution, long service life, high efficiency, and low investment cost, it gets more and more people’s attention. There have established several compressed air energy storage power stations in foreign countries, and they all are large scale energy storage systems. The development of small and micro-small scale compressed air energy storage (MS-CAES) systems mostly are in the stage of theoretical research, and they have not been put into commercial operation. Compared with conventional CAES power plant, MS-CAES system needn’t to burn fossil fuels, truly realizing zero emissions. It uses high-pressure gas storage device to store air, no restriction on the geographical environment, and flexible in use. Hence, it can be used as backup power supply, micro smart grid and independent power supply in remote networks. Obviously, research on MS-CAES system has practical significance.The paper mainly researches a new compressed air energy storage method, hydro-pneumatic cyclic compressed air energy storage (HPC-CAES). The technology controls solenoid valves in mechanical full-bridge mode, with super-capacitor as auxiliary device, and constitutes a hybrid energy storage power system. Its working medium is liquid, and its energy storage medium is gas. Firstly, the paper studies the current situations and development trends of compressed air energy storage systems at home and abroad, and analyzes the characteristics of two kinds of MS-CAES technologies, such as sole compressed air energy storage (SCAES) and hybrid compressed air energy storage (HCAES). Secondly, the paper researches the working characteristics of HPC-CAES from two aspects of energy storage and release, including system structure, working principle, parameter characteristics and control processes, etc. This part mainly introduces the compression-release efficiency. Thirdly, the article researches the characteristics of hydraulic pump/motor. On the basis of simulation of hydraulic system parameters, propose maximum efficiency point tracking (MEPT) strategy to promote system efficiency by polyfit method. Finally, use Matlab/Simulink to build HPC-CAES system model. The simulations verify the correctness of the theoretical analysis. In addition, design an experimental platform of power15kW and storage pressure15MPa to carry out experiments under laboratory condition. |
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