Optimal dispatch of integrated energy system with CCUS-P2G coupling and hydrogen-doped gas equipment based on ladder-type carbon trading mechanism

To further achieve low-carbon economic operation and optimize energy utilization, the carbon capture, utilization and storage (CCUS) technology, power-to-gas (P2G) technology, and hydrogen-doped gas equipment (HDGE) are incorporated in integrated energy system (IES) in this paper. And an optimization scheduling model of IES with CCUS-P2G coupling and HDGE based on the reward and penalty ladder-type carbon trading mechanism (RPLTCTM) is proposed. Firstly, the CCUS-P2G coupling model, and the HDGE model with variable hydrogen-doped ratio are established to expand the utilization of H 2 . Secondly, considering the fairness principle of carbon trading, the RPLTCTM with reward and penalty coefficients is constructed to constrain carbon emissions. Thirdly, an optimal dispatch model of IES with CCUS-P2G coupling and HDGE based on RPLTCTM is established to optimize the total cost of the system. Finally, by setting different scenarios for comparative validation, the simulation results demonstrate that the proposed model effectively improves the utilization rate of renewable energy, and possesses better economic and low-carbon benefits. Furthermore, from the perspective of economy and low-carbon, the impact of hydrogen-doped ratio and carbon trading parameters on IES is revealed. • A novel IES with CCUS-P2G coupling and hydrogen-doped gas equipment is proposed. • The variable hydrogen-doped ratio operation mode is utilized to address the forced output problem of P2H. • The RPLTCTM is employed to further constrain the carbon emissions of IES. • The impact of multiple parameters on carbon emissions and total cost of IES is analyzed thoroughly.