Haoting Qin Hao Hu Shenhao Yang Chao Ma ^* Xiaobin Yan

• Southwest Electric Power Design Institute Co.,Ltd., Sichuan, China

With the continuous development of the economy and society, the global energy demand and climate issues have become increasingly serious. As a result, the low-carbon economic optimization of comprehensive energy systems, considering multi-energy complementarity, has emerged as a critical research area. This paper presents a low-carbon economic scheduling model for a combined heat and power virtual power plant, incorporating two-stage flexible power-to-gas and carbon capture. Firstly, concentrating solar power equipment is used to realize the thermoelectric decoupling of traditional virtual power plant, which promotes the improvement of solar energy utilization efficiency. The introduction of independent power-to-hydrogen production and methanation reactions, combined with hydrogen fuel cells and storage systems, enables the multi-path utilization of hydrogen energy. Vacuum pressure swing adsorption equipment is used to meet the requirements of oxygen load. Moreover, a heat and power demand response mechanism is developed, whereby replaceable loads that do not affect user comfort can be adjusted based on the responsive power load. This allows for energy coupling and substitution to be achieved. Additionally, a tiered carbon trading mechanism, in combination with carbon capture equipment, has been implemented with the objective of achieving low carbon emissions and optimal economic benefits within the park. The cases verify the dual advantages of the proposed model, demonstrating its capacity for energy saving and multipurpose operation, as well as its suitability for low-carbon economy operation.