Research On Energy Hub Configuration Evaluation And Operation Optimization Technology In Integrated Energy System

With the increasingly serious shortage of fossil energy and pollution,people have studied new energy systems that can couple cold,heat,electricity,gas and other energy forms.The integrated energy system has been sought after by people because it can effectively integrate different types of distributed power system and break the working model of independent planning and separate operation of traditional energy systems.As the core component of the integrated energy system,the energy hub breaks the concept of source-network-load-storage,realizes the mutual transformation and coordination between different energy sources,improves the energy utilization efficiency,and meets the user’s multiple energy load needs.At the same time,the access of multiple distributed power sources brings new challenges to the configuration planning and operation optimization of energy hub.In this thesis,the technical problems of energy hub configuration evaluation and operation optimization in integrated energy system are studied in depth.The main research contents are as follows:Firstly,the basic structure of integrated energy system and energy hub is constructed,and energy equipment such as wind power,photovoltaic power generation units,electric boilers,gas boilers and energy storage are introduced.The operation mechanism and characteristics are analyzed,and a detailed mathematical model is established according to the operation characteristics of the equipment.According to the energy transformation form of energy equipment,it is divided into three categories:energy supply equipment,energy conversion equipment and storage equipment,which lays a foundation for the follow-up study of energy hub configuration evaluation and operation optimization.Secondly,the configuration evaluation method of the energy hub system is analyzed and studied,and the energy hub configuration evaluation model including economy,reliability,energy efficiency and environmental protection is established,and the comprehensive evaluation method based on AHP-gray correlation analysis is used to calculate and solve,and the energy hub configuration planning and evaluation results of multiple evaluation indicators are obtained,the optimal capacity and specific installation quantity of energy equipment are determined,and the correlation degree of the configuration scheme under different schemes is analyzed,and the maximum correlation degree of the system is finally obtained.That is,the optimal solution for energy hub configuration planning.The correctness of the configuration evaluation method is verified by simulation analysis.Finally,this thesis studies the operation optimization of energy hub.The operation optimization model of energy hub is constructed,and the comprehensive operation cost,primary energy consumption and system CO₂emission are taken as the optimization objectives.,and the improved NSGA-II algorithm is applied to the operation optimization model of the energy hub system to solve,and the Pareto optimal solution set of the objective function and the optimal output of the energy equipment are obtained,and the results calculated by the traditional NSGA-II algorithm are compared,and the simulation results are analyzed.This shows the feasibility of the proposed energy hub operation optimization model,which further verifies the effectiveness of the improved NSGA-II algorithm,and the algorithm has a good optimization effect.