Comprehensive Efficiency Evaluation Of Integrated Energy System Based On Cross-super-efficiency

With the large-scale exploitation and consumption of fossil energy,the energy crisis and environmental crisis seriously restrict the development of society.How to ensure energy-saving,efficient,clean and sustainable energy supply has increasingly become a global issue of concern.Integrated energy system integrates all kinds of energy supply networks into a whole through internal organic coordination.It is an effective way to solve energy and environmental problems,which is outstanding in energy saving,high efficiency,economy and environmental protection.According to the actual needs of integrated energy system planning and the outstanding benefits of integrated energy system in terms of high efficiency,reliability,energy saving and emission reduction,this paper studies the comprehensive efficiency evaluation index and evaluation model of integrated energy system.The main work and conclusions are as follows:(1)On the basis of analyzing and summarizing the principles of selecting comprehensive efficiency indicators and the input costs and output benefits of integrated energy system in various aspects,an evaluation index system of integrated energy system efficiency is established.The specific values of the indicators are obtained by calculating the results of economic dispatch of integrated energy system.(2)Data envelope analysis in operational research is applied to the comprehensive efficiency evaluation of integrated energy system.CCR(Charnes-Copper-Rhodes)model and super-efficiency CCR model are analyzed and deduced.Aiming at the shortcomings of CCR model,which can not compare the efficiency of effective decision-making unit and the inconsistency of evaluation criteria of super-efficiency CCR model decision-making unit,there are theoretical defects.Cross efficiency is applied to super-efficiency CCR model to optimize model.The comprehensive efficiency evaluation model of integrated energy system based on cross-superefficiency CCR model is established,and the specific process of comprehensive efficiency evaluation is given.(3)Taking the comprehensive energy system of the electric-thermal-gas co-supply park as the research object,the validity of the evaluation method is verified by the simulation calculation and analysis of the comprehensive efficiency in summer and winter.Through the analysis of the influence of some equipment parameters on the comprehensive efficiency of the park,it is found that the trend of the comprehensive efficiency varies significantly with the equipment parameters in different seasons.A method to determine the optimal parameters of equipment considering the characteristics of different seasons is proposed.By evaluating the comprehensive efficiency of several integrated energy system planning schemes,it is concluded that the optimal scheme is the wind-gas system,while the comprehensive efficiency of the traditional CHP system without renewable energy is significantly lower than that of other schemes,which indicates that the evaluation method can provide some guidance for the planning of the system.