Modeling Of Electrothermal Integrated Energy Systems In The Form Of Thermal Fixed Electricity

Nowadays,the energy system in China is confronted with multiple problems,like supply and demand imbalance,excess capacity of traditional thermal power plants,and low utilization efficiency.It is an urgent target to develop new energy systems so as to realize "Peak carbon dioxide emission and carbon neutrality".After the exploration of renewable-based power system,smart grid,global energy Internet,ubiquitous power Internet of things and so on,the power system with the high renewable penetration and green energy replacement has become one of the effective ways to achieve the goal.As one of the main characteristics of the new energy system,the integrated energy system(IES),which takes the power system as the hub platform and realizes the deep coupling of the heterogeneous energy,like gas,cooling and heat,has been widely promoted.It realizes the conversion and complementarity of multiple types of energy through the substitution of electric energy in industry,transportation and buildings,and further strengthens the coupling relationships of various energy systems through a variety of energy storage devices and energy consumption loads.Thus,the security,flexibility and comprehensive energy consumption efficiency of the energy system are improved.As a typical form of IES,integrated electricity and heat system(IEHS)has coupled the electric power system with the district heating system through energy co-generation and transformation equipment,such as electric boiler and driving pump.Through the energy cascade utilization and complementary,the overall energy efficiency can be improved.Thus,it has been widely promoted in north China,parts of Russia,Scandinavia.This thesis studies the solutions of integrated electricity and heat system model for subsequent theoretical analysis and model application.Finally,the basic framework and general method of energy flow calculation for integrated electricity and heat system under different scenarios and control modes are explored.The main contents can be summarized as follows:1)Focusing on the IEHS under heat-load-following mode,its system structure and operational properties are characterized mathematically.On this basis,the network models(including the power system model and static/dynamic heat system model)and coupling unit models(including electric-driven heat pump,electric boiler,and combined heat and power unit)are constructed in detail.2)The modeling and solution methods of IEHS considering dynamic characteristics are investigated.Comparing different methods,the application scenarios of each method are analyzed.3)Based on the established static model and dynamic model,the basic framework and solution method of energy flow calculation for the Integrated electricity and heat system under different operating modes are studied.