| With the transformation of China’s energy industry,the traditional single-energy system has gradually developed into a multi-energy composite energy system,and the continuous progress of energy conversion technology has brought new opportunities for China’s energy conservation and emission reduction.However,the existing environmental problems make the development of the energy industry face great challenges,so while using as much clean energy as possible,we should also start from the existing energy consumption situation and minimize the impact of the development of the energy industry on the environment from the perspective of energy conservation.In addition,based on the characteristics of multi-energy synergy of integrated energy system,there are more choices to achieve "supply and demand two-way" demand response,and it can participate in the optimal scheduling of the system more actively and agilely,providing an effective control path for the safe,economical and stable operation of the system.Based on the above,this paper conducts an in-depth study on the optimal scheduling of integrated energy systems considering the two-stage operation of electricity-to-gas and the flexible response of supply and demand under the cascade carbon trading mechanism,and the main contents are as follows:The overall operation framework of the studied integrated energy system,as well as the detailed mathematical model of each subsystem and the mathematical model of the coupling equipment were established.Firstly,the basic architecture of the integrated energy system considering the cascade carbon trading mechanism and the two-stage operation of power-to-gas is introduced,and then the working principles of the cogeneration link,the two-stage operation link of power-to-gas and the cogeneration link of micro-gas turbine are analyzed,and finally the electric refrigerator and other equipment are modeled,which lays a foundation for the subsequent study of the impact of each link on the integrated energy system.An integrated energy system dispatch model considering cascade carbon trading mechanism and two-stage operation of power-to-gas is established.Firstly,carbon capture and storage technology is introduced to solve the carbon emission problems of carbon sources required for power-to-gas and cogeneration units.At the same time,hydrogen fuel cells are introduced on the basis of traditional electricity-to-gas to study the multiple benefits of two-stage operation of electricity-to-gas.Finally,the cascade carbon trading mechanism is used to limit carbon emissions.On this basis,an optimal scheduling model with the goal of minimizing carbon transaction cost,system operation cost and new energy utilization related cost is established,and the IPOPT commercial solver is used to solve it,and the economy,low carbon and wind absorption capacity of the proposed model are shown by comparison and analysis with other traditional models.An optimal control strategy of integrated energy system under low-carbon economy is established.First,a cascade carbon trading mechanism is adopted in an integrated energy system to limit its carbon emissions.Subsequently,a flexible dual response mechanism of supply and demand is proposed,and the external combustion engine cycle is introduced on the supply side to achieve a flexible response to the thermal and electrical output of the micro gas turbine unit.On the demand side,while considering that electrical,heat,and gas loads have demand responses in the time dimension,the interchangeable relationship of these three loads is also taken into account.On this basis,an optimal scheduling model with the goal of minimizing energy purchase cost,carbon transaction cost,system operation cost and compensation cost is established,and the customer energy satisfaction index is introduced into the model.Finally,simulation analysis is carried out in various scenarios to show the effectiveness of the proposed model in low-carbon economy. |
