Abstract: Under the dual challenges of continuous growth of global energy demand and intensification of climate change, the excessive consumption of traditional fossil fuels has caused serious environmental problems, especially the continuous rise of carbon dioxide emissions. In order to achieve the goal of carbon neutrality, countries are accelerating the transformation of the energy system, and the research and development of clean energy technology has become a key direction. As an advanced coal clean technology, the integrated gasification fuel cell （IGFC） power generation system is an effective way to accelerate the realization of the “dual carbon” goal, and it is of great forward-looking significance to build a low-carbon and economical flexible operation mechanism of source-grid-load-storage based on the integrated coal gasification fuel cell. In order to promote the large-scale consumption of renewable energy and reduce the carbon emissions of the power system, a new power system that adapts to the access of a high proportion of renewable energy and multi-energy complementarity is proposed to achieve the dual goals of economic and low-carbon operation. Firstly, the overall coal gasification fuel cell-electrolyzer （EL） hydrogen-power cogeneration operation framework was constructed, and a variety of energy sources were reasonably allocated for mutual conversion. Secondly, the electric carbon characteristics and carbon use efficiency in the operation of the system were analyzed, and a carbon dioxide treatment model was proposed to improve the level of wind and solar consumption and increase the amount of carbon capture storage （CCS）. Finally, a multi-energy complementary source-grid-load-storage combined operation strategy is proposed, and an optimal scheduling model is constructed with the goal of minimizing the comprehensive cost, and compared with the traditional IGFC carbon capture power plants, the carbon capture capacity is increased by 49%, the curtailment of wind and solar power is reduced by 98.2%, and the comprehensive cost is reduced by 32.4%. The results show that the proposed model can not only effectively improve the carbon capture rate, but also release the flexibility of the unit, alleviate the contradiction between the energy supply and decarbonization goals of the unit, and still take into account the low carbon emission while meeting the needs of high proportion of renewable energy consumption and multi-energy complementarity.