Optimization of System Configuration and Production Simulation for On-grid Green Hydrogen Projects

Green hydrogen produced from renewable energy through electrolysis is regarded as complementary to electricity, which could help decarbonize sectors that are hard to electrify. Besides, electrolytic hydrogen can serve as an interface and build synergy between different sectors and energy networks. Recently, many demonstration projects, which are normally composed of power generation units, energy storage units and electrolysers, are in the phase of planning and construction. Optimization of the system configuration and the power supply plan are essential elements to reduce the cost of green hydrogen and increase its economic competitiveness. In this paper, an optimization planning model for on-grid green hydrogen projects embedded with the function of production simulation is presented. Then, two case studies are carried out based on the proposed model. One represents green hydrogen projects in the northwestern area with plentiful renewable resources, relatively lower electricity prices and smaller price differences between peak and valley period. The other represents the ones in the southeastern area with relatively higher electricity prices and bigger peak-valley price differences. In each case study, the system configuration is optimized considering the photovoltaic (short as PV) and wind power output characteristics in the local area. Furthermore, the power supply plan, including when to use self-built power plants and when to use power from the grid is also optimized and analyzed. At last, specific suggestions are summarized and proposed for green hydrogen demonstration projects, which could provide important references for the future planning.