  There has been growing interest in integrating hydrogen storage into power
grids with high renewable penetration levels. The economic benefits and power
grid reliability are both essential for hydrogen storage integration. In this
paper, an annual scheduling model (ASM) for energy hubs (EH) coupled power
grids is proposed to investigate the annual benefits of seasonal hydrogen
storage (SHS). Each energy hub consists of hydrogen storage, electrolyzers, and
fuel cells. The electrical and hydrogen energy can be exchanged on the bus with
the energy hub. The physical constraints for both grids and EHs are enforced in
ASM. The proposed ASM considers the intra-season daily operation of the EH
coupled grids. Four typical daily profiles are used in ASM to represent the
grid conditions in four seasons, which reduces the computational burden.
Besides, both the intra-season and cross-season hydrogen exchange and storage
are modeled in the ASM. Hence, the utilization of hydrogen storage is optimized
on a year-round level. Numerical simulations are conducted on the IEEE 24-bus
system. The simulation results indicate that seasonal hydrogen storage can
effectively save the annual operation cost and reduce renewable curtailments.
