Research On Low-carbon Economy Planning Of Integrated Energy System Based On Energy Hub

Under the multiple environmental pressures,such as climate warming and extreme weather,reducing carbon emissions and seeking low-carbon transformation of the energy industry has become a hot issue in the relevant research areas.Building integrated energy systems is an essential method to achieve the coordinated operation of multiple energy sources and reduce fossil fuel dependence.Meanwhile,new opportunities and challenges are brought to the low-carbon economic planning of the integrated energy system,due to the carbon capture and storage technology,power-to-gas technology（P2G）,integration of large-scale energy vehicles,energy management technology,environmental policies,etc.In the context,this dissertation focuses on the study of the low-carbon economic planning of integrated energy system with the following works:Firstly,in order to promote the carbon dioxide（CO₂）capture and realize the proper treatment of CO2,an operation mode is proposed through combining carbon capture systems（CCS）and P2G facilities,and a low-carbon economic planning model of a small regional integrated energy system（SIES）is established considering the operation mode.Moreover,the effect of selling energy from small regional integrated energy system to the upper energy network is also considered in the model.By an improved directed acyclic graph modeling method,the model is expressed as a mixed integer linear programming（MILP）which can be solved by a commercial solver.The effects of combined CCS and P2G and selling energy from small regional integrated energy system to the upper energy network are analyzed by simulation examples.Secondly,in view of the energy conservation and emission reduction of the integrated energy system under the background of the integration of large-scale energy vehicles,an operation mode is proposed through regarding new energy vehicles as flexible energy storages of the integrated energy system based on the above research,and the incentive measures based on the operation mode is also presented.Based on the above operation mode and incentive measures,a low-carbon economic planning model of a small regional integrated energy system is established considering regarding new energy vehicles as flexible energy storages,and various uncertainties of new energy vehicles are simulated in the proposed model.The effects of regarding new energy vehicles as flexible energy storages of the integrated energy system is analyzed by simulation examples.Thirdly,the issue of energy conservation and emission reduction is further discussed with taking the integrated energy network and multiple small regional integrated energy systems as the research object.The small regional integrated energy system is proposed to couple the power system,natural gas system and Energy users,and the bidirectional energy exchange between the small regional integrated energy systems and the upper energy network,as well as the integrated demand response（IDR）are considered in the SIES.Based on the above idea,a low-carbon economic expansion planning of multiple regional integrated energy systems is established considering bidirectional energy exchange and integrated demand response.The planning includes the investment decision of carbon capture system for fossil fuel units in the energy network,and the system structure and equipment capacity planning of small regional integrated energy systems.The effects of bidirectional energy exchange and IDR is analyzed by simulation examples.Finally,on the basis of above research,in order to further analyze the impact of energy cascade utilization and environmental policy on energy conservation and carbon emission reduction of integrated energy network and multiple small regional integrated energy systems,a low-carbon economic expansion planning model of multiple small regional integrated energy systems is established considering thermal energy cascade utilization and emission policy is proposed,where the emission policies include a reward and punishment ladder-type carbon trading and a punishment ladder-type oxynitride tax.The effects of thermal energy cascade utilization and emission policy is analyzed by simulation examples.