Optimal Scheduling Of Integrated Energy System Considering Dynamic Characteristics

Energy is a solid foundation for the development of human society,science,technology and economy.How to use energy efficiently and green is a difficult problem for our country and the whole world.Integrated energy systems are new modes of energy use that can coordinate multiple sources of energy and energy consumption,and demonstration studies have been carried out in various countries.However,because of its multi-energy and multi-energy flow characteristics,the accuracy of optimal dispatch is affected.At the same time,due to a variety of energy coupling devices in the system,it is possible to improve the optimal dispatch economy of the comprehensive energy system by considering its energy conversion and energy cascade utilization process in the optimal dispatch.Therefore,it is necessary to study the comprehensive energy optimal dispatch considering the dynamic characteristics of each energy transmission network and the energy conversion of coupling devices.Starting from the basic structure of the integrated energy system,this paper first analyses the energy conversion relationship among power,heat and natural gas subsystems,and establishes the mathematical models of each subsystem.Secondly,the process of heat medium transfer is analyzed.Based on the transmission delay and temperature loss of the heat network,a heat network constraint considering the dynamic characteristics of the heat network is established,and an optimal dispatch model for the comprehensive energy system with the dynamic characteristics of the heat network is constructed.Then,for the transmission process of natural gas pipeline network,the dynamic characteristics constraints of gas network pipeline storage are established,and the optimal dispatch model of the electric-thermal-gas integrated energy system considering electrical conversion and related coupling devices such as hydrogen fuel cell and residual heat power generation is constructed.Finally,the effectiveness of the optimal scheduling scheme of the integrated energy system,which takes into account the dynamic characteristics of the heat network and gas network,and the coupling equipment of power to gas,is tested through several examples,such as 6-node electric power-6-node thermal calculation example,IEEE33-node-16 node thermal calculation example,and improved IEEE39-node-20 node natural gas system-6-node thermal system calculation example,of the integrated energy system,so as to improve the consumption capacity of renewable energy in the integrated energy system.The research of this paper provides a new optimization idea for the dispatch of comprehensive energy system,and has a certain engineering reference value for the demonstration project of comprehensive integrated energy system.