Abstract: Higher demands on the flexibility of the power grid have been posed by the large-scale grid connection of renewable energy, and the issue of wind and solar abandonment under the high penetration rate of renewable energy has gained prominence. This paper proposes an integrated hydrogen- electric coupling system based on "electric-hydrogen" two-way coupling for wind-solar-hydrogen-gas turbines. The hydrogen- blend gas turbine combined cycle model is established in part working conditions using the data-driven method. The wind generator, photovoltaic panel, and electrolyzer mechanism models are integrated to establish the system full-working condition model based on the fusion of data and mechanism. The multi-objective capacity configuration optimization model based on NSGA-Ⅱ algorithm is established. Under typical environmental conditions and load demand, the Pareto optimal solution set with the goals of greatest annual profit and minimum CO₂ emission is obtained. The findings indicate that the lowest power loss rate is 0.004 5, the lowest power abandonment rate is 0.010 5, and the CO₂ emission may be decreased to 396 g/(kW⋅h). Growing wind power's installed capacity is a more effective way to lower CO₂ emissions than growing PV. The lowest level of CO₂ emissions, which is 948, 300 tons/year, can be achieved when wind power reaches 72.89 MW installed capacity. The pursuit of reduced CO₂ emissions will cause economic gains to decline, and the unwarranted pursuit of economic benefits will harm the system's ability to produce power reliably. The configuration scheme that yields the maximum economic benefits has an annual profit of 35.86 million yuan and a power supply loss rate of 0.104 9. This integrated wind-solar-hydrogen-gas turbine system can efficiently absorb renewable energy, lower CO₂ emissions, and increase power supply reliability.