Effect of pump and turbine flow on a pumped compressed air energy storage system

In the context of green transformation of energy structure, pumped compressed air energy storage systems can be used to enhance the wind and solar energy consumption capacity of the power grid. In this paper, a mathematical model is developed to reveal the effects of pump and turbine flows on the system performance, respectively. First, mathematical modelling was carried out for three key devices. Second, the effect of pump flow on the process of air pressure and air temperature changes is revealed. Third, the effect of the turbine flow is analyzed. The results show that when the pump flow increases, the charging duration decreases, the pressure of air rises faster and the air temperature maximum increases. An increase in turbine flow will result in a shorter discharging duration. As a result, the pressure in the tank drops faster and the air temperature minimum decreases. As the pump flow increases, the ηE increases, and the ηX and ESD decrease. When turbine flow increases, ηE, ηX, and ESD decrease.