Low-Carbon Economic Dispatch of Integrated Energy System Considering Electricity-Hydrogen Coupling and Green Certificate-Carbon Trading Synergy

[Objective] To improve the low-carbon economy of park-level integrated energy systems under the “dual carbon” goals， a bi-level Stackelberg-Nash game optimization scheduling method integrating electricity-hydrogen coupling and green certificate-carbon trading is proposed. [Methods] A multi-energy flow coupling framework is first constructed， incorporating liquid-storage carbon capture， two-stage power-to-gas， and hydrogen-blended natural gas technologies， to achieve multi-energy complementarity and low-carbon synergy. Second， a synergistic green certificate-carbon trading mechanism is established， where green certificate revenues and tiered carbon costs are incorporated into the objective function to form a closed-loop market that incentivizes low-carbon operation. Furthermore， an “operator-user” bi-level Stackelberg-Nash game framework is developed： the upper level sets pricing and scheduling strategies， while the lower level adjusts energy consumption behavior. The game equilibrium is solved using the Alternating Direction Method of Multipliers. [Results] Case studies show that， compared with traditional master-slave game scheduling， the proposed method reduces total system cost by 7.9% and carbon emissions by 10.0%， while effectively improving renewable energy accommodation and multi-stakeholder coordination. [Conclusions] This method provides effective technical support for achieving the “dual carbon” goals in park-level integrated energy systems.