Modeling And Optimization Of Distributed Energy System Based On Thermoeconomics Structure Theory

With the acceleration of China's economic development and the increasing demand for energy and resources,it is very important to develop a low-carbon economy.At present,there are problems of relative scarcity of resources and low efficiency of energy utilization in China.At the same time,the environmental pollution caused by industrial production is aggravating,and the energy and environmental problems seriously affect the economic development of our country.The emerging distributed energy system can supply energy close to the demand,save financial and material resources,and has great potential in energy saving and consumption reduction,which will inject vitality into the cause of energy saving and emission reduction in China.In this context,the distributed energy system is taken as the research object,and the economic modeling,analysis and optimization methods of energy system are studied for the purpose of energy and sustainable economic development.According to the structure theory of thermos-economics,a complete system of analysis,evaluation and optimization of distributed energy system is established,which provides a reliable theoretical basis for energy saving,consumption reduction and optimization transformation of similar energy systems.Due to the limitations of traditional energy analysis,modeling and evaluation methods,the thermos-economic structure theory will be used as the basis of system modeling and analysis in this paper.Taking TG80 unit as a sample,the main process of transforming thermodynamic model into thermos-economic model is described in detail.Finally,the model of distributed energy system and thermos-economic model are established.Based on the definition of fuel-product,the production relationship between equipment is quantified by utilizing the production cost and thermos-economic cost,and the process and law of system cost formation are analyzed.Through the analysis of the law of cost composition of rake cost and thermos-economics,the influence of each component on cost is explored.According to the specific irreversible loss,unit loss and loss coefficient of the system,the performance of each component of the system was judged,and it was found that the performance of combustion chamber and refrigeration components needed to be optimized.Based on the analysis and evaluation of the system,the reasons for the increase of the cost of combustion chamber,high pressure generator,refrigeration components and thermos-economics are pointed out,which points out the direction of thermos-economics optimization.Because of the complexity of the optimization objective function,a better algorithm is needed to optimize it.Therefore,this paper improves the Differential Evolution(DE)algorithm,which establishes a life cycle mechanism based on individual life span.It dynamically adjusts the scaling factor and cross probability factor,and improves the optimization ability and convergence speed of the algorithm.Finally,the reliability and feasibility of the improved algorithm are verified by identifying the nonlinear system.Finally,according to the conclusion of system analysis and evaluation,the parts with poor performance in absorption lithium bromide refrigerator are optimized.Taking the total unit product thermos-economic cost as the objective function,the parameter adaptive differential evolution algorithm is used to optimize the objective function,and the optimal operating point is obtained.By comparing the results with the unit thermos-economic cost and the specific irreversible loss under rated operating conditions,it is found that the specific irreversible loss and the product thermoseconomic cost of lithium bromide refrigerator components can be reduced by optimizing operating parameters,which proves the feasibility of energy saving and consumption reduction.