基于混沌理论的多供冷系统同步监测与控制研究
发布时间：2018-07-21 14:33
【摘要】：多供冷系统是制冷系统的一种普遍存在形式,它主要由压缩机、冷凝器和多个相互独立的冷藏室组成。超市制冷系统便是一个典型的多供冷系统,食品会依据存储温度的不同被放置在不同陈列柜中,这些陈列柜共用一套压缩机组和冷凝器组。在传统控制中,陈列柜中的温度控制器通常采用滞环控制,这些控制器是在互不知情的情况下设计和运行的,看似独立,实际上存在不可避免的耦合关系和相互作用。实践发现,超市制冷系统中,一个陈列柜的温度控制会影响周围几个陈列柜的温度,渐渐地几个温控器会趋于同步,最终导致冷藏质量下降,能源消耗增加。 目前,我国经济迅速增长,能源问题越来越受到重视。在开发寻找新能源的同时,提高能源利用率已成为当前需要解决的热点问题。制冷行业是能源消耗较大的行业,因此如何解决超市制冷系统中的同步问题,提高能源利用率,成为了重要的研究课题。本文针对多供冷系统中的同步问题,基于混沌理论,研究了基于kuramoto有序参数的同步监测算法和基于延迟反馈控制的解同步控制问题,主要内容如下： (1)介绍了多供冷系统的工作原理,分析了多供冷系统中同步问题产生的机理；以超市制冷系统这一典型的多供冷系统为例,介绍了以描述同步动态特性为目的的系统数学模型,其中包括陈列柜、吸气管汇、压缩机组的动力学方程；并在合理假设前提下,将上述非线性模型简化为分段仿射切换系统模型。 (2)介绍了混沌的定义、混沌的基本特征、混沌运动的表征参数；基于庞加莱映射理论对系统进行了稳定性分析；利用分岔理论,对系统进行了动态分析,发现当系统收敛到低周期轨道时,系统有趋于同步的危险；当系统运行在高周期轨道,甚至是混沌时,系统远离了同步,这为下面提出解同步策略,即使系统混沌化,奠定了基础。 (3)介绍了kuramoto模型,引出了kuramoto有序参数,并通过实验仿真成功地利用kuramoto有序参数进行同步早期监测：其次介绍了几种典型的混沌反控制方法,并基于混沌化思想利用延迟反馈控制成功地实现系统的解同步；仿真结果表明,解同步后系统能耗得到明显降低。
[Abstract]:Multi-cooling system is a common form of refrigeration system. It mainly consists of compressors, condensers and several independent refrigerators. Supermarket refrigeration system is a typical multi-cooling system, food will be placed in different display cabinets according to different storage temperature, these display cabinets share a set of compressor and condenser group. In the traditional control, hysteretic loop control is usually used in the temperature controllers in display cabinets. These controllers are designed and operated without any knowledge, and appear to be independent. In fact, there is an inevitable coupling relationship and interaction. It is found that in the supermarket refrigeration system, the temperature control of a display cabinet will affect the temperature of several display cabinets around, and gradually several thermostats will tend to synchronize, resulting in the decrease of refrigerating quality and the increase of energy consumption. At present, our country economy grows rapidly, energy problem receives more and more attention. At the same time, improving energy efficiency has become a hot issue to be solved. Refrigeration industry is an industry with large energy consumption, so how to solve the synchronization problem in supermarket refrigeration system and improve energy utilization ratio has become an important research topic. In this paper, aiming at the synchronization problem in multi-cooling system, based on chaos theory, the synchronization monitoring algorithm based on kuramoto ordered parameters and the desynchronization control problem based on delay feedback control are studied. The main contents are as follows: (1) the working principle of multi-cooling system is introduced, and the mechanism of synchronization in multi-cooling system is analyzed. This paper introduces the mathematical model of the system for describing the synchronous dynamic characteristics, which includes the dynamic equations of the display cabinet, the suction tube, and the compressor unit, and on the premise of reasonable assumption, The above nonlinear model is simplified as the piecewise affine switched system model. (2) the definition of chaos, the basic characteristics of chaos and the parameters of chaotic motion are introduced, and the stability of the system is analyzed based on the Poincare mapping theory. By using bifurcation theory, the dynamic analysis of the system is carried out. It is found that when the system converges to a low period orbit, the system tends to synchronize, and when the system runs in a high period orbit or even chaos, the system is far from synchronization. This provides a foundation for the following solution strategy, even if the system is chaotic. (3) the kuramoto model is introduced, and the kuramoto ordered parameters are derived. The kuramoto parameters are successfully used in the early monitoring of synchronization. Secondly, several typical anti-chaos control methods are introduced, and the de-synchronization of the system is successfully realized by using delayed feedback control based on the idea of chaos. The simulation results show that the system energy consumption is obviously reduced after de-synchronization.
【学位授予单位】：东华大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB657
本文编号：2135835
[Abstract]:Multi-cooling system is a common form of refrigeration system. It mainly consists of compressors, condensers and several independent refrigerators. Supermarket refrigeration system is a typical multi-cooling system, food will be placed in different display cabinets according to different storage temperature, these display cabinets share a set of compressor and condenser group. In the traditional control, hysteretic loop control is usually used in the temperature controllers in display cabinets. These controllers are designed and operated without any knowledge, and appear to be independent. In fact, there is an inevitable coupling relationship and interaction. It is found that in the supermarket refrigeration system, the temperature control of a display cabinet will affect the temperature of several display cabinets around, and gradually several thermostats will tend to synchronize, resulting in the decrease of refrigerating quality and the increase of energy consumption. At present, our country economy grows rapidly, energy problem receives more and more attention. At the same time, improving energy efficiency has become a hot issue to be solved. Refrigeration industry is an industry with large energy consumption, so how to solve the synchronization problem in supermarket refrigeration system and improve energy utilization ratio has become an important research topic. In this paper, aiming at the synchronization problem in multi-cooling system, based on chaos theory, the synchronization monitoring algorithm based on kuramoto ordered parameters and the desynchronization control problem based on delay feedback control are studied. The main contents are as follows: (1) the working principle of multi-cooling system is introduced, and the mechanism of synchronization in multi-cooling system is analyzed. This paper introduces the mathematical model of the system for describing the synchronous dynamic characteristics, which includes the dynamic equations of the display cabinet, the suction tube, and the compressor unit, and on the premise of reasonable assumption, The above nonlinear model is simplified as the piecewise affine switched system model. (2) the definition of chaos, the basic characteristics of chaos and the parameters of chaotic motion are introduced, and the stability of the system is analyzed based on the Poincare mapping theory. By using bifurcation theory, the dynamic analysis of the system is carried out. It is found that when the system converges to a low period orbit, the system tends to synchronize, and when the system runs in a high period orbit or even chaos, the system is far from synchronization. This provides a foundation for the following solution strategy, even if the system is chaotic. (3) the kuramoto model is introduced, and the kuramoto ordered parameters are derived. The kuramoto parameters are successfully used in the early monitoring of synchronization. Secondly, several typical anti-chaos control methods are introduced, and the de-synchronization of the system is successfully realized by using delayed feedback control based on the idea of chaos. The simulation results show that the system energy consumption is obviously reduced after de-synchronization.
【学位授予单位】：东华大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TB657
【参考文献】
相关期刊论文 前3条
1 陈亮,韩正之;混沌系统时滞反馈控制综述[J];控制与决策;2004年01期
2 熬维;;变频多联制冷系统能效问题的探讨[J];制冷与空调;2006年02期
3 陆震;以制冷节能促进可持续发展[J];制冷技术;2005年03期
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