Study Of Island Microgrid Based On Compressed Air Energy Storage System And Polycrystalline Silicon Photovoltaic Cell

As the disputes over the South China Sea become more and more intensified,our pace of exploit of the South China Sea is accelerating.So the development of oceanic islands is of great significance.Due to the far distance from the mainland,the offshore islands often meet the problem of supply difficulties.Therefore,we need to develop the microgrid that do not rely on or as little as possible external power supply.Unlike traditional energy storage methods,adiabatic compressed air energy storage system will not produce any pollution to the environment and its efficiency is high.Polycrystalline silicon photovoltaic cells are currently the mainstream of photovoltaic cells.The photoelectric conversion efficiency still needs improvement.In this paper,an island microgrid based on adiabatic compressed air energy storage system and a new type of polycrystalline silicon photovoltaic cell is established.The optimal scheduling method of microgrid is proposed according to the load characteristics of different types of islands.The main contents are as follows:(1)This paper introduces the model of adiabatic compressed air energy storage system.According to the working principle,the mathematical models of energy storage,energy release and gas storage are established,and the working efficiency of compressor,expander and heat exchanger in the process is analyzed.The main factors affecting the overall efficiency of the adiabatic compressed air energy storage system are analyzed.Combined with the energy dissipation model of the energy flow during the operation of the compressed air energy storage system,the correspondence between the system efficiency and the storage-release time interval is established.(2)The factors affecting the photoelectric conversion efficiency of polysilicon solar cell are analyzed.The surface of the polycrystalline silicon photovoltaic cells is subjected to suede treatment and chemical etching and then passivated by hydrogenated amorphous silicon.The front electrodes and back electrodes are fabricated by Ag and Al respectively.The photoelectric conversion efficiency of the new type photovoltaic cells are measured and compared with the traditional polysilicon photovoltaic cells.(3)The load characteristics are studied and the featuress of different island load are summarized with the islands on the South China Sea.Based on the model of the island microgrid,the optimization strategy is proposed according to the characteristics of photovoltaic cell,compressed air energy storage and load characteristics aiming at reducing the total operation cost.This method can provide a reference for the construction and development of microgrid in South China Sea.