Research On Low Carbon Economic Dispatch Strategies Of Regional Integrated Energy Systems

The traditional energy sector operates in a single mode,which makes it difficult to meet the development goals of energy conservation and emission reduction.The Regional Integrated Energy System,which couples electricity,heat and natural gas energy systems,has a much more flexible regulation than traditional energy systems,through the coordinated control of the various energy systems,can improve system energy efficiency while reducing system carbon emissions.This thesis investigates the low carbon economy of a regional integrated energy system containing carbon capture and electricity-to-gas conversion,and explores the full potential of the low carbon dispatch of the regional integrated energy system from the supply and demand side of the multi-energy system.The main elements are as follows:Firstly,starting from the supply side of the regional integrated energy system,the modules of the system are modelled and a mathematical model containing renewable energy units,energy conversion equipment and energy storage equipment is established.A detailed analysis of the operating principles and the energy transfer characteristics achieved by the carbon capture and power-to-gas technology(P2G)is presented.Secondly,a low-carbon economic dispatch strategy for a regional integrated energy system with flexible carbon capture plants and P2 G combined operation is proposed.The operating mechanisms of CHP units,carbon capture and gas-toelectricity plants are analysed,and a combined CHP-CCS-P2G(CCP)operation model is proposed.To address the problem of the temporal discontinuity between the electrolysis of water and the methanation process in the electro-to-gas technology,a carbon storage device was added and the energy time shift characteristics of the carbon storage device were investigated to decouple the electrolysis of water and the methanation process in time.A low-carbon economic dispatch model for a regional integrated energy system considering carbon trading is developed under the CCP joint operation strategy,with the objective of minimising system dispatch costs and carbon emissions.The results show that the joint operation strategy proposed in this thesis plays an important role in reducing the system economic dispatch cost and carbon emission,and improving the level of scenery consumption.Furthermore,based on the low-carbon mechanism of demand response peak shaving,an integrated demand response mechanism is introduced into the established regional integrated energy system low-carbon dispatch model,and a two-stage regional integrated energy system low-carbon economic dispatch model that integrates demand response and CCP from source-load coordination to reduce emissions is established and solved by an improved White Shark Optimizer.In the simulation analysis,different scenarios are set up to verify the advantages of source-load coordination for promoting low-carbon operation of the regional integrated energy system.Finally,considering the source-load data prediction error and with the help of information gap decision theory,information entropy weights are introduced to calculate the weight factors of multiple uncertainty parameters,eliminating the subjectivity of traditional information gap decision theory,and a regional integrated energy systems robust model and opportunity model based on entropy-weighted adaptive information gap decision theory are constructed to quantify system uncertainty and investigate the effects of model level factors on system uncertainty,dispatch costs and carbon emissions.The improved method is also compared with the traditional information gap decision theory,stochastic programming and robust optimization methods to verify the superiority of the method used in this thesis.