Research On Low-carbon Economic Dispatch Of Integrated Energy System Considering Electricity-hydrogen-gas Coordination

Since China proposed the dual carbon targets of carbon capping and carbon reduction at the United Nations General Assembly,building a low-carbon and environmentally friendly integrated energy system has gradually become a major research direction for coordinated development at present.Meanwhile,with the wide application and investment of carbon reduction technologies and equipment such as carbon capture and carbon sink,the introduction of carbon capture units into the electricity-hydrogen interconnected integrated energy system can further reduce the pollutant emissions of the electricity-hydrogen interconnected integrated energy system.However,in the actual operation of the electricity-hydrogen interconnected integrated energy system,how to consider the carbon emissions of energy suppliers in the carbon market or energy supply equipment,implement the economic operation of the integrated energy electricity-hydrogen supply equipment in the interconnected system,and promote the application of new carbon reduction theories and carbon reduction technologies in the power system has become a major problem that needs to be urgently studied and solved at present.Based on the above research problems,this paper studies and analyses the carbon emission characteristics of the integrated energy system with electricityhydrogen-gas interconnection by establishing an integrated energy system model with carbon capture units.In order to give full play to the carbon emission reduction capacity of the electricity-hydrogen-gas interconnected integrated energy system,a stepped carbon trading mechanism is considered.A low carbon economic dispatch model for the electricity-hydrogengas interconnected integrated energy system is developed.A theoretical basis is provided for the transition of the system to a low-carbon economic operation model.The main contents of this paper are as follows.（1）Research on the model of electricity-hydrogen-gas interconnection integrated energy system and carbon emission model.Firstly,by analyzing the architecture of the electricityhydrogen interconnected integrated energy system,the coupled input-output model of the integrated electricity-hydrogen interconnected energy system between energy supply,energy conversion equipment system and energy storage device is established,and the output characteristics of electric energy,hydrogen and gas within the electricity-hydrogen interconnected integrated energy system are analyzed.Then,by studying the carbon emission characteristics of energy supply equipment such as thermal power units and gas turbines in the integrated energy system and the carbon emission characteristics of natural gas users,a calculation model of carbon emission equipment is established,laying the foundation for subsequent research.（2）Research on the optimization model of the carbon emission reduction capacity of the electricity-hydrogen-gas interconnected integrated energy system.In order to better improve the natural emission reduction capacity of the electricity-hydrogen-gas interconnected integrated energy system,the operation model of the carbon capture equipment was established by analyzing the working principle of the carbon capture equipment and considering the conversion of carbon dioxide and the operation energy consumption of the equipment.Then,the coordinated operation of the carbon capture equipment and other equipment in the electric-hydrogen interconnected integrated energy system was analyzed,and an optimization model of the carbon reduction capacity of the electric-hydrogen interconnected integrated energy system with the optimization objective of optimal system carbon reduction was established,and an improved binary grey Wolf algorithm was used to establish the optimization model.Finally,the corresponding simulation model and simulation scenarios were established to analyze the carbon emission reduction capacity of the electricityhydrogen-gas interconnected integrated energy system under each operation scenario,and the feasibility and effectiveness of the method were verified.（3）Research on the low carbon economic dispatch model of the electricity-hydrogen interconnected integrated energy system considering the carbon trading mechanism.Firstly,the existing carbon emission allocation methods were analyzed,and an initial carbon emission allocation model based on distributed decision-making for the electricity-hydrogen interconnected integrated energy system was established,and the carbon emission trading mechanism in the system was analyzed and studied.Considering the two optimization objectives of total system operation cost and carbon trading,a low-carbon economic dispatch model of the electricity-hydrogen-gas interconnected integrated energy system considering stepped carbon trading is established.The operation cost,carbon emission and operation power under the change of carbon price are analyzed by simulation algorithm.The impact of operating mode changes on the operation of carbon capture devices and the dispatch of the electricity-hydrogen-gas interconnected integrated energy system is analyzed recognizing the enhanced carbon trading mechanism under the optimal operation of the electricity-hydrogengas interconnected integrated energy system.