Low-carbon Economic Dispatch Of Electric-gas Integrated Energy System Based On Carbon Capture And Demand Response

Looking at the present,China is in the critical period of industrial upgrading and economic transformation,and CO₂emission reduction has become the unified goal of traditional energy industry and new energy industry.The electric integrated energy system（IEGS）with great emission reduction potential takes traditional fossil energy as the main body,and integrates natural gas,light,wind and other primary energy forms.It plays an important role in improving the consumption level of renewable energy and promoting low-carbon electricity.At the same time,it has certain practical significance to use carbon capture technology to transform coal-fired power plants from high carbon emissions to low carbon.The demand response can cut the peak and fill the valley in IEGS and realize the low carbon economic operation in IEGS.Based on the above background,this paper takes the electric-gas integrated energy system as the research object and studies the optimization scheduling problem of the integrated energy system,which takes into account carbon capture,electric-gas conversion and user-side comprehensive demand response as well as user energy experience.The main contents are as follows:First of all,according to the different principles of carbon capture and emission reduction,this paper analyzes the operation characteristics and energy flow situation of carbon capture power plant under different operation modes,and deeply studies the energy time-shifting characteristics of its internal liquid storage tank and its improved system operation flexibility.Secondly,the operation principle and its main application in the electric-gas integrated energy system are analyzed.By studying the economic characteristics of P2G,it is proved that the carbon cost of P2G will restrict the system’s wind abandoning consumption level and reduce the operation economy of the system.In this article,through coupling carbon capture power plant（CCPP）and P2G,use of carbon capture system to capture CO₂as a raw material supply to the P2G synthesis of methane,in view of the P2G,carbon capture system problems are not synchronized at run time,on the basis of the study to further research on CCS-P2G joint operation strategy,through the research of the storage tank"power shift",The positive impact of the new combined operation mode of P2G-CCPP including liquid storage tank on promoting wind power consumption and reducing carbon emissions was analyzed.The liquid storage tank was proposed as a CO₂"buffer station"to connect carbon capture power plant and P2G equipment.The low-carbon economic dispatching model of integrated energy system is constructed based on the flexible operation mode of carbon capture power plant and considering the joint operation of carbon capture equipment and P2G.The numerical example shows that the proposed operation mode can be used for reference in implementing IEGS low-carbon economic scheduling.Finally,based on the low carbon mechanism of demand response peak-cutting and valley filling,this paper introduces the demand response mechanism when establishing the IEGS low carbon economic scheduling model,and constructs the IEGS low carbon economic scheduling model that considers the demand response and the coordinated emission reduction of source and load in the comprehensive flexible carbon capture power plant in two stages.The calculation examples show that energy time shift can be realized through the operation of coupled electric-gas equipment in the comprehensive and flexible carbon capture power plant on the source side,and demand response is introduced into the load side to achieve the purpose of peak clipping and valley filling of the source and load together,which provides a positive impact on the low carbon economic operation of IEGS.