Economic Dispatch Of Electricity-Gas-Heat Integrated Energy System Considering Low Carbon Characteristics Of Source And Load

With the continuous promotion of energy interconnection and low-carbon power,the integrated energy system will become an important carrier of energy saving and emission reduction.The integrated energy system takes electricity as the core,uses renewable energy power generation technology and information technology,and integrates various energy sources such as coal,oil,natural gas,electricity and heat in the region,which can not only meet the diversified energy demand in the system,but also promote the consumption of renewable energy,improve energy utilization efficiency and It is also an important way to achieve the goal of "double carbon" in China.In this paper,we focus on the low-carbon economic optimization of integrated energy systems,and our main work is as follows:Firstly,we analyze the changes brought by the introduction of low-carbon characteristics of source and load on the framework of integrated energy economic dispatch model;we introduce the typical architecture of integrated energy system and model the typical equipment in integrated energy based on the modeling theory of energy hub;we establish the stepwise carbon trading model of integrated energy system,including the initial carbon quota model of integrated energy system based on the baseline method and the actual carbon emission model of integrated energy system based on the life cycle method.The actual carbon emission model of the integrated energy system and the stepped carbon cost model were established,which laid the foundation for the establishment of the integrated energy low-carbon economic optimization model in the subsequent chapters.Secondly,by analyzing the energy-consuming characteristics of carbon capture and considering the effective utilization of partial carbon dioxide through electricity to gas absorption,a coupled model of the joint operation of carbon capture power plant and electricity-to-gas is constructed to establish a low-carbon economic dispatch model of the integrated energy system of electricity-to-gas considering the cost of carbon capture and carbon transaction cost;for the non-convex and non-linear characteristics of the model,it is transformed into a mixed-integer convex optimization model by linear transformation and improving the second-order cone relaxation method.The model is transformed into a mixed-integer convex optimization model by linear transformation and improved second-order cone relaxation;it is validated by simulation on a modified IEEE 30-node power system and a Belgian 20-node natural gas system,and the results show that the developed model can effectively reduce carbon emissions and total system operation costs.Finally,a master-slave game model between the source and the load considering the low-carbon characteristics is established based on the joint operation of the carbon capture power plant and the electricity-to-gas conversion on the source side and the integrated demand response on the load side.In this model,the integrated energy operator aims at the highest revenue for itself and sets the appropriate electricity and heat prices under the premise of satisfying the load demand,while the load aggregator aims at the lowest energy cost for itself and optimizes the load curve through demand response under the real-time electricity and heat prices;to simplify the solution of the constructed game model,the Karush-Kuhn-Tucker condition(KKT)is used to transform the two-layer game model into a single-layer model,and the McCormick method is applied to linearize the bilinear term in the objective function;the proposed model is verified to be effective in achieving the low-carbon economic operation of the system through arithmetic analysis.