Low-Carbon Dispatch for an Offshore-Wind-Integrated Electricity–Gas–Methanol System Adopting a Variable Hydrogen Blending Ratio of Gas Network

Abstract

The large-scale integration of offshore wind power increases the flexibility requirements of the integrated power grid. To address this issue, a low-carbon dispatch strategy is proposed for an offshore-wind-integrated electricity–gas–methanol system with variable hydrogen blending in the gas network. A combustion and carbon emission model of the hydrogen-mixed gas turbine (HMGT) is further developed considering the variation in gas composition caused by hydrogen blending. The dispatch framework also integrates carbon emission allowance (CEA) trading with the China Certified Emission Reduction (CCER) mechanism to account for carbon trading costs and CCER revenues from grid-connected offshore wind power. The results show that, compared with the case without the coordinated operating mechanism, the proposed strategy reduces wind curtailment by 189.88 MWh, gross operating cost by 3.49% and carbon emissions by 9.07%. The proposed strategy improves the flexibility, economic performance and low-carbon operation of the integrated electricity–gas–methanol system, thereby supporting the sustainable operation of offshore-wind-integrated energy systems.