Abstract
As a novel energy storage technology suitable for large-scale application, pumped thermal electricity storage (PTES) technology has a high energy storage density and is not limited by specific geographical conditions. However, most of the current research on PTES is carried out around rated working conditions, and lack of research on dynamic characteristics, which makes it difficult to predict, regulate and optimize the performance of the system in the actual operation process. According to the system structure and the operating principle of each component, the dynamic simulation model of the PTES system based on closed Brayton cycle was established, the control strategy and dynamic performance of the system during the startup process were studied, and the influence of key parameters on the system startup performance was analyzed in this study. The simulation results show that for the charge process, the higher rotational speed increase rate, the faster rotational speed rises in the initial stage, but the system startup time is the same. For the discharge process, the rotational speed increase rate not only affects the system startup time but also cause great fluctuation and overshoot in the rotational speed when the rotational speed increase rate is unreasonable. For the system in this study, it is more reasonable to select 100 rpm/s for the rotational speed increase rate, considering safety and rapidity. The initial pressure of the system does not affect the steady-state pressure ratio but does affect the stable-state pressure. In order to make the system's pressure finally reach the rated value, the initial pressure of charging should be set to 4.45 MPa, and that of discharge should be set to 5 MPa. The dynamic simulation model and the results of dynamic characteristics analysis in this study can provide a reference for the design optimization and the formulation of actual operation control strategies of the PTES system.
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