Low-carbon economic dispatch of integrated energy system based on oxygen-driven synergistic hydrogen production utilizing coal and electricity

To address the dual challenges of high costs and substantial carbon emissions in hydrogen production within integrated energy systems (IES), this study proposes a novel low-carbon economic dispatch model based on oxygen-driven synergistic hydrogen production utilizing coal and electricity, incorporating a substitution effect mechanism under carbon emission trading (CET) and green certificate trading (GCT). First, a model for synergistic hydrogen production utilizing coal and electricity is established. Integrating coal-to-hydrogen (CTH) and electrolytic hydrogen production using oxygen reduces costs and enhances the refined utilization of hydrogen. Second, oxy-fuel combustion capture (OCC) is introduced, coupling CTH, electrolytic hydrogen production, and carbon capture units driven by oxygen. OCC significantly improves carbon capture performance, facilitating the transition from grey hydrogen to blue hydrogen. On this basis, a trading framework for the substitution effect mechanism is established to enhance the linkage between CET and GCT markets. Case studies demonstrate that, compared to conventional electrolytic hydrogen production, the proposed model reduces total system costs by 14.34 % and carbon emissions by 35.55 %. Furthermore, the substitution effect increases the total revenue of CET and GCT by 154.35 % and further reduces carbon emissions by 7.62 %.