| Integrated Energy System(IES)has the superiority of energy cascade utilization,higher energy efficiency and flexible energy supply.IES meets the demand for building a clean,lowcarbon,safe and efficient modern energy system,for which it has attracted great attention recent years.Carrying out the related research of optimal configuration is helpful to promote the construction and development of IES.At present,for the reason that research do not pay enough attention to the role of energy storage equipment,and there observed little evaluation indicator study about storage characteristic,the important functions of energy storage smoothening the load,cutting peaks and filling valleys cannot be fully exerted.To this end,author takes the distributed IES with energy storage devices as the configuration object,and conducts in-depth research on comprehensive evaluation,optimal configuration model construction of system,and calculation example analysis,which provides an important reference for integrated configuration design and IES optimization.Firstly,several single performance evaluation indicators related to economy,energy efficiency,environmental protection and storage device utilization are established.By adopting the AHP-entropy weight formulation method,a new 3E-S evaluation indicator is constructed.Author concludes that the utilization effect of energy storage has a larger information entropy value than other indicators in this optimal configuration problem.Secondly,author analyzes the load demand characteristics of five scenarios,which are hotels,offices,hospitals,shopping malls,and campus regions,and clarifies the coupling relationships between equipment outputs.Then author establishes mathematical model of IES optimal configuration based on the characteristic models and the 3E-S evaluation indicator.In order to solve the problem that involves numerous constraints,variables,and nonlinear characteristics,author simplifies the model so that the Cplex solver that bases on branch and bound method could obtain stable and high-precision calculation results.Thirdly,author takes the indicators of economic benefit,energy efficiency,environmental protection and 3E-S as objective functions,respectively,to construct the optimal configuration model,realize solving calculation and comparative analysis.Results show that the method proposed in this paper not only has the advantages of 3E strategies,but also significantly improves operation condition of energy storage equipment.Moreover,through the comparison of configuration results between different scenarios,conclusions can be made that the model and configuration scheme proposed by this paper are quite applicative.Finally,author adopts a sensitivity analysis method to analyze the impact of natural gas price and generation power sold price.It is found that the price fluctuation of natural gas lead to an approximate linear function relationship with the economy result.When the electricity selling price increases but does not exceed a reasonable range,the operating condition of the generation engine can be improved. |
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