Low-carbon optimal dispatch of integrated energy system considering the operation of oxy-fuel combustion coupled with power-to-gas and hydrogen-doped gas equipment

To reduce carbon emissions and optimize energy utilization of integrated energy system (IES), an integrated electricity-heat-gas energy system containing coupled operation of oxy-fuel combustion capture and power to gas (OCC–P2G) and hydrogen-doped gas equipment is established in this paper. Firstly, the introduction of OCC technology transforms the thermal power unit into the OCC unit. The net output model of OCC unit and the equation of electric-carbon characteristic are established. Secondly, the two-stage refinement model of power to gas (P2G) and the model of hydrogen-doped gas equipment are constructed. Thirdly, considering the fairness principle of punishing positive carbon emissions and rewarding negative carbon emissions, a reward-penalty staircase carbon trading mechanism was constructed to constrain system carbon emissions. On this basis, an economic dispatch model of integrated energy system is established. The simulation results demonstrate that the ratio of wind abandonment is 0%, the actual carbon emission is only 35.08% of carbon quota, and the operation cost is only 237.1 thousand dollars. By setting multiple scenarios for comparative verification, the proposed strategy has lower economic cost and carbon emission.