小型分布式能源系统的优化研究

发布时间：2018-03-07 21:46

本文选题：分布式能源系统　切入点：动态负荷　出处：《太原理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：分布式能源系统在解决能源危机以及环境问题上有着突出的贡献。由于分布式能源是以能量梯级利用为设计准则的,因此分布式能源系统能够充分利用一次能源。随着全球经济社会的不断发展,分布式能源系统的研究也必将越来越受重视。但是由于系统冷、热、电出力与用户侧冷、热、电负荷需求在匹配上仍存在着问题,因此有时设计出来的分布式能源系统的经济效益达不到预期的效果。这一问题的存在使得许多投资者望而止步,并严重影响到分布式能源系统的发展及普及。另一方面,分布式能源系统配置方案多样。在几种配置方案都能够满足负荷需求时,哪种配置方案更加地经济性也同样困扰着投资者。本文就是针对这些问题展开研究的：在负荷匹配问题上,本文将选择蓄能装置作为系统负荷匹配的调节手段,并对带蓄能装置联供系统的运行策略进行优化研究；在方案的选择上,本文将对基于燃气内燃机联供方案、基于燃气轮机联供方案、基于燃气内燃机带蓄能装置联供方案、基于燃气轮机带蓄能装置联供方案这四种方案进行比较分析。 (1)文章对常见的几种冷热电联供系统的配置方案进行了总结,并对各个方案的原理及优缺点进行了详细的阐述。然后对系统中涉及到的主要设备进行了数学建模,同时针对蓄能装置的性能进行了建模。 (2)选择了建筑负荷模拟软件DesT,对太原地区某多功能办公楼进行了全年逐时冷热电负荷的模拟计算。根据建筑的负荷分布特点建立了四种联供方案。然后通过以电定热的思路确定了各联供方案设备的容量。接下来根据各设备的数学模型建立起了以典型日运行费用最小为目标函数的联供系统运行优化模型,并选择了线性规划法和动态规划法作为模型求解的优化算法。根据优化结果可以看出：基于燃气内燃机带蓄能装置的联供系统其运行成本最低,而基于燃气轮机不带蓄能装置的联供系统其运行费用最高。 (3)为了全面的评价各方案的经济性,本文选择了净现值、净现值率及投资回收期等经济性指标对各方案进行了评价。从结果上显示：由于蓄能装置起到转移负荷的作用,使得带蓄能装置的联供系统可以选择较小容量的电动压缩机组,这样使系统的初投资有所减小。同时根据计算结果可以看到在建立的四个方案中,基于燃气内燃机带蓄能装置的冷热电联供系统的经济性最好。
[Abstract]:Distributed energy systems play an important role in solving energy crisis and environmental problems. With the development of global economy and society, the research of distributed energy system will be paid more and more attention. There are still problems in matching electricity demand, so sometimes the economic benefits of the distributed energy systems that are designed are not as good as expected. On the other hand, the configuration of distributed energy system is diverse. When several configuration schemes can meet the load demand, Which configuration scheme is more economical is also perplexing investors. This paper focuses on these problems: in the load matching problem, this paper will choose the energy storage device as the adjusting method of system load matching. In the selection of the scheme, this paper will be based on the gas combustion engine co-supply scheme, based on the gas turbine joint supply scheme, based on the gas internal combustion engine belt energy storage system joint supply scheme. The four schemes are compared and analyzed based on the combined supply scheme of gas turbine with accumulator. In this paper, several common configuration schemes of combined cooling and heating power supply system are summarized, and the principles, advantages and disadvantages of each scheme are described in detail. Then the mathematical modeling of the main equipment involved in the system is carried out. At the same time, the performance of the storage device is modeled. 2) selected the building load simulation software DesT to simulate the hourly cooling and thermal power load of a multifunctional office building in Taiyuan area. According to the load distribution characteristics of the building, four combined power supply schemes were established. According to the mathematical model of each equipment, the optimal operation model of the joint supply system is established, which takes the minimum operation cost of a typical day as the objective function. The linear programming method and the dynamic programming method are selected as the optimization algorithms to solve the model. According to the optimization results, it can be seen that the running cost of the combined power supply system based on the gas internal combustion engine with energy storage device is the lowest. The combined supply system based on gas turbine without energy storage device has the highest operating cost. 3) in order to evaluate the economy of each scheme comprehensively, the economic indexes such as net present value (NPV), net present value rate (NPV) and investment recovery period are selected to evaluate the schemes. The results show that the storage unit plays a role in transferring the load. The combined power supply system with energy storage device can select a small capacity electric compressor unit, so that the initial investment of the system is reduced. At the same time, according to the calculation results, we can see that in the four schemes established, The combined cooling and heat supply system based on gas combustion engine with energy storage device is the best.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU83

【引证文献】