Abstract: To enhance the utilization efficiency of renewable energy in the renewable energy bases in desert,gobi and wasteland areas and reduce the CO₂ emission level from supporting coal-fired power units, based on a study of an integrated wind-solar-thermal-storage system comprising 8 000 MW photovoltaic, 4 000 MW wind power, and 4×1 000 MW coal-fired units in desert,gobi and wasteland areas as the research foundation. To address the issue of surplus electricity within the system, a hydrogen production-storage-cofiring collaborative operational framework is constructed, and the overall configuration scheme of the wind-solar-thermal-storage coupled with a hydrogen energy system is clarified. A year-round chronological simulation model and an economic evaluation model of the production and storage systems are developed. A hybrid operation strategy based on abandoned power-to-hydrogen and hydrogen-coal co-firing in coal-fired units is formulated. A multi-dimensional boundary condition system is established, including power balance constraints, electrolyzer load constraints, and battery charge-discharge constraints. A particle swarm optimization algorithm is employed, with annual net revenue and CO₂ reduction as dual objective functions, to optimize the capacity configuration of the hydrogen production and storage systems.The results show that under the optimal configuration scheme （electrolyzer capacity: 325 MW; hydrogen storage tank capacity: 64 t; supporting battery power: 95 MW with 2.2 h storage duration）, the renewable energy utilization rate increases from 92.3% to 94.2%, and abandoned power is reduced by 456.45 GWh and achieve an annual CO₂ emission reduction of 53 983 tons, while the annual net revenue is −65.31 million yuan. Sensitivity analysis indicates that the electrolyzer cost exerts the greatest influence on annual net revenue, followed by the hydrogen storage tank cost. Studies have shown that although the techno-economic feasibility of abandoned power-to-hydrogen combined with hydrogen-coal co-firing remains limited under scenarios with short abandoned power durations but large instantaneous abandoned power, the proposed pathway still holds significant theoretical and practical value for reducing fossil energy dependence and promoting deep decarbonization in large-scale renewable energy bases.