天然气冷热电联供能源系统运行优化研究

发布时间：2018-04-05 18:16

本文选题：冷热电联供　切入点：目标函数　出处：《上海电力学院》2017年硕士论文

【摘要】：作为越来越受到关注的天然气冷热电联供(Combined Cooling,Heating and Power,CCHP)系统,不需要进行大电网远距离高压或者超高压线路建设,大大降低了线损,并且非常明显地节省了输配电建设的投资费用。另外,随着社会的发展,加上近几年雾霾天气的严重影响,人们对环境保护的意识也逐渐增强,作为清洁能源的天然气资源越来越得到能源产业的青睐。对天然气CCHP系统进行运行优化研究,实现能源供应与用户负荷之间的协调匹配,是目前研究的热点问题。本文对能源站改造前后的能源供应系统做了详细分析,并对改造后系统的燃气轮机、余热锅炉、蒸汽轮机、辅助锅炉、吸收式制冷机和电制冷机建立了数学模型,从而使燃气-蒸汽联合循环供能系统的运行优化结果更加准确。分别以运行总成本最低作为单目标函数,以能源节约率和二氧化碳减排率综合指标最大作为多目标函数进行优化。优化模型的求解问题为典型的混合型整数非线性规划(Mixed-Integer Nonlinear Programming,MINLP)问题。运用LINGO软件进行模型求解,利用MATLAB软件对优化结果进行分析对比。对比发现,若以运行总成本最低为目标函数,电价起到主导性作用,“峰-谷”时段分布对运行优化的结果起着重要作用。若以能源节约率和二氧化碳减排率为多目标函数进行优化,则优先使用能源站本身机组进行产能,如果产能不够,则再从电网端引入电量。另外,天然气CCHP能源系统对节能环保起到非常明显的积极作用。本文建立了全面的评价指标体系,分别从经济性、环保性、节能性、技术先进性、可靠性和安全性等六个方面进行了综合评价,使得评价结果更加全面综合,优化了其他学者在评价体系方面只重视经济性的不足。使用一种新的1-9标度方法确定评价指标元素的权重值,并结合专家打分法、层次分析法、半梯形模糊隶属度法,建立了CCHP系统模糊评价模型,既考虑了专家的主观意见,又综合了CCHP系统运行的实际指标参数。把主观意见与客观数据进行了有效的结合,使得评价结果更加科学合理,改变传统评价方法的主观性太强的缺点。最后结合实际应用,进行案例分析。
[Abstract]:Natural gas cooling heating as more and more attention for the (Combined Cooling, Heating and Power, CCHP) system, without the need for large power grid or long-distance high-voltage EHV transmission line construction, greatly reducing the power loss, and greatly saves the investment cost of power transmission and distribution construction. In addition, with the development of society, and in recent years, the haze weather seriously affecting the people's awareness of environmental protection has gradually increased, as natural gas resources and clean energy is the energy industry's favor. Operation optimization research on natural gas CCHP system, realize the coordination between energy supply and load matching, is a hot research topic in this paper. A detailed analysis of the energy supply system of energy station before and after the modification, and the gas turbine, the reformed system of waste heat boiler, steam turbine, auxiliary boiler, absorption refrigeration machine and electric system The cooler has established the mathematical model, so that the optimization results of gas steam combined cycle power supply system more accurate. Respectively to the total cost of operation as the lowest single objective function, the energy saving rate and the rate of carbon dioxide emission reduction index as the multi-objective function optimization problem. To solve the optimization model for mixed integer nonlinear programming the typical (Mixed-Integer Nonlinear Programming, MINLP). The model was solved by using the LINGO software, using MATLAB software to analyze the optimization results. By comparison, the lowest total cost in terms of operation as the objective function, price plays an important role, "peak valley" time distribution plays an important role in the operation of the optimization results. In terms of energy saving rate and carbon dioxide emission reduction rate for multi objective optimization function, the priority use of energy station itself unit capacity, such as fruit production Can not, then from the power grid is introduced into electricity. In addition, the energy system of natural gas CCHP positive effect is very obvious in energy-saving and environmental protection. This paper established a comprehensive evaluation index system, respectively, from the economic, environmental protection, energy saving, advanced technology, six aspects of reliability and safety for the comprehensive the evaluation, which makes the evaluation results more comprehensive optimization of other scholars only lack of economic importance in the evaluation system. Using a new 1-9 scale method to determine the weight of evaluation index values, combined with expert scoring method, AHP, semi trapezoid fuzzy membership method, established the fuzzy evaluation system CCHP the model, which considers the subjective views of experts, and comprehensive practical parameters of CCHP system. The subjective and objective data were effectively combined, which makes the evaluation results more scientific and reasonable, change the pass The shortcomings of the subjective evaluation method are too subjective. Finally, the case analysis is carried out in combination with the practical application.

【学位授予单位】：上海电力学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM61;TU83;TU996

【参考文献】