| The structure and energy flow of the integrated energy system are complex.The main operating entities involved include power systems,natural gas systems and heating systems,CHP operators,users with new energy.Different subjects’ interests are different,and the operational constraints are also different.Therefore,establishing a reasonable energy trading mechanism and seeking a balanced energy trading and scheduling strategy on the basis of ensuring the safe and stable operation of different stakeholders is an important basis for ensuring the rational use of energy and improving energy efficiency.Starting from the important base of regional integrated energy system—multi-energy complementary microgrid system,this thesis established a multi-agent master-slave game model of multi-energy complementary microgrid system based on energy hub,and studied the hybrid energy flow calculation method of electric-gas-heat network in regional integrated energy system.Further study on the regional integrated energy system optimization operation method considering the security and stability conditions of the energy supply network was done.This thesis mainly completed the following work:Firstly,investigation of the development and research status of regional integrated energy systems at home and abroad was done,and this thesis put forward the importance of multi-agent interaction mechanism and operation optimization methods that take into account multi-subject interests and security constraints in regional integrated energy systems.Secondly,basing on the energy hub,the master-slave optimization operation model of integrated energy microgrid system considering integrated energy service providers,energy storage operators and multi-agent interests and constraints with PV user clusters was proposed.The master-slave optimization based on intelligent optimization algorithm was also proposed.The model example illustrated the rationality of the model and the sensitivity analysis was done.Thirdly,from the perspective of source-network-loading,the mathematical modeling of distribution network,gas distribution network and heating network was carried out respectively.Combined with Kirchhoff’s law,the flow balance equations of the energy distribution network were established and the equation is solved by Newton’s Lawson method through feasibility analysis.And then the calculation method of the mixed power flow of the regional integrated energy system was proposed.Fourthly,combined with the research of energy hub optimization and energy flow analysis in integrated regional integrated energy system,this thesis proposed a regional integrated energy system interaction mechanism considering the security constraints of the energy distribution network,and further proposed an integrated energy system operation optimization method based on dynamic energy supply network security constraints.The example showed that the proposed model can ensure the safe and stable operation of the regional integrated energy system and reduce the operating cost of the energy hub.In this thesis,the energy flow analysis and operation optimization methods of regional integrated energy systems were studied.The simulation and analysis of the models and methods are carried out by numerical examples.The results show that the proposed method is reasonable and effective. |
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