【摘要】：多供冷系統(tǒng)是制冷系統(tǒng)的一種普遍存在形式,它主要由壓縮機(jī)、冷凝器和多個(gè)相互獨(dú)立的冷藏室組成。超市制冷系統(tǒng)便是一個(gè)典型的多供冷系統(tǒng),食品會(huì)依據(jù)存儲(chǔ)溫度的不同被放置在不同陳列柜中,這些陳列柜共用一套壓縮機(jī)組和冷凝器組。在傳統(tǒng)控制中,陳列柜中的溫度控制器通常采用滯環(huán)控制,這些控制器是在互不知情的情況下設(shè)計(jì)和運(yùn)行的,看似獨(dú)立,實(shí)際上存在不可避免的耦合關(guān)系和相互作用。實(shí)踐發(fā)現(xiàn),超市制冷系統(tǒng)中,一個(gè)陳列柜的溫度控制會(huì)影響周圍幾個(gè)陳列柜的溫度,漸漸地幾個(gè)溫控器會(huì)趨于同步,最終導(dǎo)致冷藏質(zhì)量下降,能源消耗增加。 目前,我國(guó)經(jīng)濟(jì)迅速增長(zhǎng),能源問題越來越受到重視。在開發(fā)尋找新能源的同時(shí),提高能源利用率已成為當(dāng)前需要解決的熱點(diǎn)問題。制冷行業(yè)是能源消耗較大的行業(yè),因此如何解決超市制冷系統(tǒng)中的同步問題,提高能源利用率,成為了重要的研究課題。本文針對(duì)多供冷系統(tǒng)中的同步問題,基于混沌理論,研究了基于kuramoto有序參數(shù)的同步監(jiān)測(cè)算法和基于延遲反饋控制的解同步控制問題,主要內(nèi)容如下： (1)介紹了多供冷系統(tǒng)的工作原理,分析了多供冷系統(tǒng)中同步問題產(chǎn)生的機(jī)理；以超市制冷系統(tǒng)這一典型的多供冷系統(tǒng)為例,介紹了以描述同步動(dòng)態(tài)特性為目的的系統(tǒng)數(shù)學(xué)模型,其中包括陳列柜、吸氣管匯、壓縮機(jī)組的動(dòng)力學(xué)方程；并在合理假設(shè)前提下,將上述非線性模型簡(jiǎn)化為分段仿射切換系統(tǒng)模型。 (2)介紹了混沌的定義、混沌的基本特征、混沌運(yùn)動(dòng)的表征參數(shù)；基于龐加萊映射理論對(duì)系統(tǒng)進(jìn)行了穩(wěn)定性分析；利用分岔理論,對(duì)系統(tǒng)進(jìn)行了動(dòng)態(tài)分析,發(fā)現(xiàn)當(dāng)系統(tǒng)收斂到低周期軌道時(shí),系統(tǒng)有趨于同步的危險(xiǎn)；當(dāng)系統(tǒng)運(yùn)行在高周期軌道,甚至是混沌時(shí),系統(tǒng)遠(yuǎn)離了同步,這為下面提出解同步策略,即使系統(tǒng)混沌化,奠定了基礎(chǔ)。 (3)介紹了kuramoto模型,引出了kuramoto有序參數(shù),并通過實(shí)驗(yàn)仿真成功地利用kuramoto有序參數(shù)進(jìn)行同步早期監(jiān)測(cè)：其次介紹了幾種典型的混沌反控制方法,并基于混沌化思想利用延遲反饋控制成功地實(shí)現(xiàn)系統(tǒng)的解同步；仿真結(jié)果表明,解同步后系統(tǒng)能耗得到明顯降低。
[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.
【學(xué)位授予單位】：東華大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TB657

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 陳亮,韓正之;混沌系統(tǒng)時(shí)滯反饋控制綜述[J];控制與決策;2004年01期

2 熬維;;變頻多聯(lián)制冷系統(tǒng)能效問題的探討[J];制冷與空調(diào);2006年02期

3 陸震;以制冷節(jié)能促進(jìn)可持續(xù)發(fā)展[J];制冷技術(shù);2005年03期

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本文編號(hào)：2135835