Research on Modular Low-Pressure Compressed Air Energy Storage System Based on Wind Power Consumption

It is an important research direction to absorb wind power by using the flexible response characteristics of energy storage system. However, the conversion efficiency of high-pressure system will decrease in the process of temperature rise. For this reason, this paper proposes the modular compressed air energy storage system (CAES) in low-pressure whose characteristics can be described by isentropic theory, which can simplify the theoretical analysis and avoid efficiency decrease of the high-pressure CASE. At the same time, the system based on the modular energy storage unit, can control the charge and discharge efficiency according to the wind power fluctuation, so as to effectively absorb wind power. The experiments show that the system has high energy density when the cylinders exhaust in sequence, and has high power density when exhaust at the same time, which can well match the wind power fluctuation.