Structural Layout And Pipe Network Optimization Of Electric Thermal Energy System

With the aggravation of the energy crisis and environmental problems in all countries in the world,the past energy utilization mode and system structure have been difficult to apply,the development of renewable clean energy,improve the efficient use of resources,so as to achieve the goal of energy structure transformation is imminent.In a certain area,the traditional electric system,natural gas system,heat grid system and other distributed energy systems are coordinated and managed.By building a comprehensive energy system,the coordination and optimization of electricity,gas,heat,solar and other energy sources are realized,thus improving the operation efficiency and safety of the system.This paper takes the established energy hub model as the center,comprehensively considers the interconnections among various parts of the network among the integrated energy systems,and analyzes their coupling characteristics in detail.The main contents are as follows:1)Studied the basic modeling of basic equipment such as power grid,gas grid and the connection hub of two networks under the framework of electricity/gas/heat energy structure,and analyzed the operation characteristics of different equipment and systems in the comprehensive energy system;2)The power flow model of the integrated energy system network of the electric network and the natural gas network in the integrated energy system is studied,the model of the energy hub is given,and the mathematical model of the multi-objective power flow optimization of the integrated energy system is established.Through the integrated energy system coupling links(cold and hot electricity supply system)analysis of the minimum total operation cost in an integrated energy system is established,the link exchange of power and energy system network loss minimum as the objective function of the integrated energy system optimization schedulingmodel,and in the process of optimal power flow model optimization,aiming at the three objective function,taking into account the factors,gives the relevant constraints,through the example simulation,using non dominated sorting quickly multi-objective genetic algorithm(NSGA II),the article proposed model is verified the practicability and effectiveness of optimization algorithm,It ensures the stable economic operation of the comprehensive energy system.3)Superstructure modeling is carried out for the heat transfer network in the structure of electric,gas and heat energy systems.Based on the proposed superstructure model,a mixed integer nonlinear programming model with annual total cost as the goal is established,and then the genetic algorithm is used to optimize the solution.Finally,the feasibility of the model and method in this chapter is verified by case analysis.4)The natural gas transportation pipeline network system is studied and optimized.The problem is described and solved by programming with the method of integrated integer nonlinear programming(MINLP)through the method of superstructure modeling.