摘要
Thermal-integrated pumped thermal electricity storage(TI-PTES)could realize efficient energy storage for fluctu-ating and intermittent renewable energy.However,the boundary conditions of TI-PTES may frequently change with the variation of times and seasons,which causes a tremendous deterioration to the operating performance.To realize efficient and flexible energy storage in operating conditions,a novel composition-adjustable TI-PTES is pro-posed,and the operating performance is investigated and compared with composition-fixed TI-PTES.Simulation results show that,compared to composition-fixed TI-PTES,the energy storage efficiency of TI-PTES could be enhanced by the absolute value of 4.4–18.3%by introducing composition adjustment method under various boundary con-ditions.Besides,tuning sub-system composition could simultaneously adjust the capacities of power input,heat storage and power output,realizing a more flexible operating range for TI-PTES.A case study for an isolated energy community shows that composition-adjustable TI-PTES could realize 100%conversion of off-peak electric energy and reduce daily investment by 35.6%compared with composition-fixed TI-PTES.
基金
funding provided by University of Science and Technology of China.This work is financially supported by the Students’Innovation and Entrepreneurship Foundation of USTC(Grant No.CY2022G35)
Youth Innovation Promotion Association CAS(Grant No.2022463)
the USTC Institute for Carbon Neutrality and Joint research center for multi-energy complementation and conversion.
