基于布雷顿循环的不同构型卡诺电池储能系统性能分析

Performance Analysis of Different Configuration Carnot Battery Energy Storage System Based on Brayton Cycle

当前储能技术的限制制约了大规模可再生能源的利用,研究基于布雷顿循环的卡诺电池储能系统的可行性尤为重要。为此,首先建立了布雷顿循环型卡诺电池的热经济模型,其次计算并分析了不同循环构型以及循环工质对布雷顿型卡诺电池储能系统热力性能及经济性能的影响,得出了系统最优配置,最后在不同峰谷电价差下对最优系统进行了经济性评估。研究结果表明:辅助换热器能有效提高系统的净输出功和储能往返效率,放电过程膨胀机出口的辅助换热器提升效果最为显著;以氩气为循环工质,充电过程压缩机、膨胀机进口以及放电过程压缩机、膨胀机出口均有辅助换热器的系统具有最优的综合性能,储能往返效率为54.23%,平准化储能成本为1.13元/kWh;峰谷电价差越大,系统的经济性越好,从而具有更高的投资价值。

Current limitations in energy storage technology restrict the utilization of large-scale renewable energy,making the study of the feasibility of Carnot battery energy storage systems based on the Brayton cycle particularly important.This paper first establishes a thermos-economic model for the Brayton cycle Carnot battery.Subsequently,it calculates and analyzes the impact of various cycle configurations and working fluids on the thermodynamic and economic performance of the Brayton type Carnot battery energy storage system,leading to the identification of the optimal system configuration.Finally,an economic evaluation of the optimal system is conducted under different peak and valley tariffs differentials.The results indicate that the auxiliary heat exchangers can effectively enhance the system’s net output power and round-trip efficiency,with the auxiliary heat exchanger at the outlet of the expander during the discharge process demonstrating the most significant improvement.Using argon as the working fluid,systems with auxiliary heat exchangers at the inlet of the compressor expander during the charging process and at the outlet during the discharging process exhibit optimal overall performance,with the energy storage round-trip efficiency of 54.23%and the levelized cost of energy storage is 1.13 Yuan/kWh.Furthermore,larger peak and valley tariffs differentials enhance the system’s economic viability,thereby increasing its investment value.