【摘要】：無線網絡控制系統(tǒng)是近年來逐漸興起的一種以無線傳輸通信為基礎的分布式控制系統(tǒng)。它利用無線網絡把分布在不同位置的系統(tǒng)節(jié)點連接起來,擺脫了控制系統(tǒng)對金屬傳輸介質的依賴,具有成本低、維護方便,易于擴展等優(yōu)點。但是由于無線網絡通信的脆弱性,數據傳輸延時、數據丟包等因素使無線網絡控制系統(tǒng)的控制器設計工作變得十分困難。PID控制器廣泛應用于無線網絡控制系統(tǒng),它具有較強的魯棒性和通用性,且易于在工業(yè)控制系統(tǒng)中實現(xiàn)。本文以無線網絡控制系統(tǒng)為研究方向,以提高系統(tǒng)抗干擾性,降低網絡通信延遲對系統(tǒng)的負面影響為目的,探討了無線網絡控制系統(tǒng)的PID控制問題。首先,對影響無線網絡控制系統(tǒng)的基本因素進行了詳細的闡述,并著重介紹了網絡時延這一主要影響因素,分析了時延對系統(tǒng)穩(wěn)定性的影響,驗證了時延的疊加性。然后,介紹了內�？刂频南嚓P基礎理論,構建了具有PID控制器形式的IMC-PID控制器,把該控制器加入到無線網絡控制系統(tǒng),并利用粒子群算法對IMC-PID控制器引入的加權系數進行尋優(yōu)。接著,分析了廣義預測控制的相關數學理論,研究了基于廣義預測控制的PID控制器,提出了改進策略,并把控制器應用于無線網絡控制系統(tǒng)。最后,對所研究的控制器進行了仿真分析,仿真結果表明,采用粒子群優(yōu)化的IMC-PID控制器和改進后的基于廣義預測的PID控制器都具有較強的魯棒性,降低了系統(tǒng)的超調量,抑制了干擾作用,能夠對網絡時延進行補償。從而提高了無線網絡控制系統(tǒng)的控制質量。
[Abstract]:Wireless network control system (WNCS) is a distributed control system based on wireless transmission and communication. It uses the wireless network to connect the nodes distributed in different locations, and gets rid of the dependence of the control system on the metal transmission medium. It has the advantages of low cost, convenient maintenance and easy expansion. However, due to the fragility of wireless network communication, data transmission delay, data packet loss and other factors, the controller design of wireless network control system becomes very difficult. PID controller is widely used in wireless network control system. It has strong robustness and generality, and is easy to be realized in industrial control system. In order to improve the system anti-jamming and reduce the negative influence of network communication delay, this paper discusses the PID control problem of wireless network control system in the research direction of wireless network control system. Firstly, the basic factors affecting the wireless networked control system are described in detail, and the network delay is introduced in detail. The influence of the delay on the stability of the system is analyzed, and the superposition of the delay is verified. Then, the basic theory of internal model control is introduced, and the IMC-PID controller with the form of PID controller is constructed, and the controller is added to the wireless network control system. Particle swarm optimization algorithm is used to optimize the weighting coefficient introduced by IMC-PID controller. Then, the related mathematical theory of generalized predictive control is analyzed, the PID controller based on generalized predictive control is studied, the improved strategy is proposed, and the controller is applied to wireless network control system. Finally, the simulation results show that both the IMC-PID controller based on particle swarm optimization and the improved PID controller based on generalized prediction have strong robustness and reduce the overshoot of the system. The interference is suppressed and the network delay can be compensated. Thus, the control quality of wireless network control system is improved.
【學位授予單位】：哈爾濱理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TP273

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相關期刊論文 前10條

1 林強;吳國偉;萬安民;于軍帥;;一種無線網絡控制系統(tǒng)的時空實時任務調度算法[J];計算機科學;2016年S2期

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本文編號：2413080