基于事件触发的网络化系统预测控制研究

发布时间：2019-05-23 17:40

【摘要】：对于网络控制系统而言,如何采取合理的控制算法及调度策略,能够在很大程度上决定网络中冲突、阻塞等现象是否产生,继而减小网络诱导延迟和数据包丢失等因素对系统造成的影响,对改善网络控制系统的性能起着至关重要的作用。近年来,事件触发这一通信机制由于其能较大的提高网络资源的利用率而受到越来越多的关注,但这一机制是以牺牲一定的控制性能为代价的,预测控制算法又能在一定程度上提升系统的控制品质,因此考虑两方面的折中进行联合研究是有意义的。本文的研究内容主要包括以下几个方面:首先,阐述了本课题的研究背景及意义,简明扼要地概述了网络化控制系统,分别从网络控制系统的概念、结构以及其中存在的待解决的问题几个方面进行了描述;然后,简单介绍了离散事件触发机制,并简要综述了预测控制的研究现状;最后,列出了下文中将要用到的主要理论及引理,并介绍了本文的主要研究内容。其次,分析与研究了具有时延的网络控制系统的事件触发控制策略。创设了基于离散事件触发机制的时滞数学模型,利用Lyapunov-Krasovskii泛函和线性矩阵不等式方法,分析了时延相关系统的稳定性,并设计了控制器,最终经过仿真算例验证了所提方法的可行性。最后,考虑带有数据丢包的线性离散时间网络化控制系统,提出了新的基于事件触发的预测控制机制,将事件触发通信机制以及预测控制结合起来,通过事件触发机制缓解通信信道压力,节约网络带宽资源,由于这样会在一定程度上降低系统的控制品质,而预测控制算法恰好能预先地对其进行补偿,将二者折中,在主动补偿了数据丢包获得理想的控制性能的同时提高了网络带宽资源的利用率。利用Lyapunov稳定性理论和LMI方法,推导出了确保整个闭环系统渐进稳定的充分条件。并把这一机制推广到带有网络诱导时延的离散时间线性系统的稳定性问题上面。
[Abstract]:For networked control systems, how to adopt reasonable control algorithms and scheduling strategies can determine whether conflicts and congestion occur in the network to a large extent. Then reducing the influence of network induced delay and packet loss on the system plays an important role in improving the performance of networked control system. In recent years, event-triggered communication mechanism has attracted more and more attention because it can greatly improve the utilization of network resources, but this mechanism is at the expense of certain control performance. Predictive control algorithm can improve the control quality of the system to a certain extent, so it is meaningful to consider the compromise between the two aspects. The research contents of this paper mainly include the following aspects: first of all, the research background and significance of this subject are expounded, and the networked control system is briefly summarized, respectively from the concept of networked control system. The structure and the problems to be solved are described. Then, the trigger mechanism of discrete events is briefly introduced, and the research status of predictive control is briefly reviewed. finally, the main theories and Lemma that will be used in the following are listed, and the main research contents of this paper are introduced. Secondly, the event trigger control strategy of networked control system with delay is analyzed and studied. A time delay mathematical model based on discrete event trigger mechanism is created. The stability of delay dependent system is analyzed by using Lyapunov-Krasovskii functional and linear matrix inequality (LMI) method, and the controller is designed. Finally, the feasibility of the proposed method is verified by a simulation example. Finally, considering the linear discrete time networked control system with data packet loss, a new predictive control mechanism based on event trigger is proposed, which combines the event triggered communication mechanism with predictive control. Through the event trigger mechanism, the communication channel pressure is alleviated and the network bandwidth resources are saved. Because this will reduce the control quality of the system to a certain extent, the predictive control algorithm can compensate it in advance and compromise the two. It not only actively compensates the data packet loss to obtain the ideal control performance, but also improves the utilization of network bandwidth resources. By using Lyapunov stability theory and LMI method, the sufficient conditions to ensure the progressive stability of the whole closed-loop system are derived. This mechanism is extended to the stability of discrete-time linear systems with network-induced delays.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP273

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