Low Carbon Economic Dispatch of Gas Electricity Coupling System Considering Carbon Capture and Hydrogen Mixing in Gas Grid

For the problem of low-carbon dispatch of gas-power integrated energy system, gas-grid hydrogen blending, carbon capture and electricity-to-gas conversion are all effective technical means. Meanwhile, carbon trading mechanism is also an effective economic means to control carbon emission. Therefore, this paper constructs a carbon capture plant model with liquid-rich and liquid-poor tanks, combined with an electric-to-methane technology model to flexibly recover and utilize CO2 in the system. Secondly, a gas-grid hydrogen blending technology model is used to improve energy efficiency, while considering the nodal calorific value change constraint during gas-grid hydrogen blending. Then the sum of incentive carbon trading cost and operation cost is used as the objective function. Finally, an arithmetic test is carried out based on the improved Belgian 20-node natural gas system and IEEE 39-node power system models. The results verify that the integrated consideration of carbon capture, gas network hydrogen blending and incentive carbon trading mechanism can improve the low carbon economic dispatch of the system. The carbon price and incentive factor can be adjusted flexibly to regulate the system carbon emission level.