Optimal Planning And Operation Of District Integrated Energy System

With the rapid development of human society,the exploitation and utilization of fossil energy are also rapidly increasing,which leads to the energy crisis and the environmental problems becoming more and more serious.For this reason,people urgently need to find an energy-saving and environment-friendly energy supply mode to replace the traditional energy supply system with high energy consumption and high pollution.District integrated energy system,with various energy sources and energy conversion equipment,can realize the energy cascade utilization and high efficiency utilization,and has been widely recognized as one of the important ways to solve these two problems.As the performance of district integrated energy system is closely related to the its planning and operation,the system can not able to realize its benefits when there is no proper system configuration or appropriate operation strategy.Therefore,in order to maximize the benefits of the district integrated energy system,it is necessary to optimize its planning and operation.This paper carried out the following research work on the planning and operation optimization of district integrated energy system:At first,this paper expounds the development and present situation at home and abroad about integrated energy system,and a summary about the academic research in the optimal planning and operation of integrated energy system at home and abroad is made.Secondly,the energy supply structure of the district integrated energy system is analyzed,and the unit mathematical modeling is carried out.The mathematical models of important components,including solar power generation equipment,gas power generation equipment,heat production equipment,refrigeration equipment,as well as the energy storage equipment are established.The off-design characteristics of these equipment are also analyzed.This part is the theoretical basis for the later research.Thirdly,aiming at maximizing the economic benefit of district integrated energy system,a economic optimal planning and operation design model of single target is set up.Using the two-stage optimization method,the equipment type and capacity of system are optimized in the first-stage while the hourly outputs of all equipment are optimized in the second-stage.The particle swarm algorithm is utilized to solve the optimization problem so as to get the optimal system configuration and operation plan.The advantages of this proposed method are verified by two numerical examples,and several influencing factors are analyzed.Finally,aiming at maximizing the economic,environmental and energy benefits of the district integrated energy system,a multi-objective optimal planning and operation optimization model is established.A multi-objective particle swarm optimization algorithm is used to get the Pareto optimal solution set of this problem,and then the optimal system scheme is selected by multi-attribute decision making based on evidence reasoning.The effectiveness and feasibility of this proposed multi-objective optimal planning and operation optimization method are verified through the analysis of example results.