Development of a Novel Energy System Based on Reversible Solid Oxide Cells and Power to Gas Technology for the Urban Energy Conversion and Storage

This work proposes a novel electricity-hydrogen energy system based on reversible solid oxide cells (RSOCs) to demonstrate the future vision of multi-energy systems on integrating multiple energy carriers such as electricity, pure hydrogen, synthetic natural gas (SNG) and mixed gas of H2-natral gas. The RSOC is specifically modelled as multi-stackable where the P2G process is sub-divided modelled by power to H2 (P2H) and power to SNG (P2SNG). The proposed electricity-hydrogen energy system optimization model is formulated as mixed integer linear programming (MILP), where the H2-blended mixed gas flow is linearized by an incremental linearize relaxation technic. The aim of the optimization is to reduce the energy cost and enhance the system's ability to integrate sufficient renewables through NG networks. Besides quantified the benefits of renewable level and H2 injection limit on the P2G process, the numerical results show that RSOC combined with H2/SNG injection results in productive economic and environmental benefits through the energy system.