【作者】 白涛；

【导师】 吴智铭；

【作者基本信息】 上海交通大学 ， 控制理论与控制工程， 2005， 博士

【摘要】 控制系统复杂化、网络化是工业控制系统发展的必然结果,是为适应企业对其生产过程提出的更高要求而产生的集检测、控制、优化、调度、管理和决策等功能于一身的高柔性、高效率、高质量的综合自动化系统。将通信网络引入控制系统,连接智能现场设备和自动化系统,实现了现场设备控制的分布化和网络化,同时也加强了现场控制和上层管理的联系,从而改善了生产过程的安全性、可靠性、效率和消耗等性能。网络的引入,改变了控制系统信息的传递方式,也改变了控制系统的动态性能。同时,在新结构下,为保证控制的实时性、安全性、可靠性等,控制系统对网络的运行性能也提出了相应的要求。本文就工业系统的网络化控制系统构造;既定网络体系结构下,网络化控制系统的控制算法设计;网络性能的提高和优化等内容进行了研究,其主要工作包括:1.从工业系统对其控制系统要求的角度出发,第一章分析了控制结构与其网络体系结构间的关系及控制对网络运行性能的要求。进而针对工业控制网络中存在的几种典型网络,从满足控制系统实时性、可靠性、安全性等要求方面对其通信协议及其实现方式进行了系统地分析。2.在给定网络和控制系统工作模式下,第二章建立了网络化控制系统的一类统一的采样系统控制模型,通过本文提出的一种新的系统分析和综合方法,分别对工业过程中普遍存在的两类被控对象(线性系统模型和广义系统模型)的网络化控制系统的稳定性进行了研究,得到保守性较小的时延依赖的系统稳定性条件。3.在系统稳定性研究的基础上,第二章还研究了给定最大网络时延条件下控制器的设计问题,建立了网络化线性系统和网络化广义系统的镇定控制器的设计算法。4.为确保控制系统的实时性、可靠性,从提高网络服务性能的角度,第三章到第五章研究了网络调度问题。?在考虑控制系统性能、网络特性、网络带宽资源约束和数据传输实时性要求等多种因素情况下从保证控制系统性能、优化带宽资源占用、公平服务等角度研究了考虑调度抖动的网络化控制系统的带宽优化问题。以Token型和CAN型网络为例分别提出了相应的带宽调度策略,并对所提调度策略下网络的稳定性和调度的可靠性进行了分析。?针对确定性竞争网络—CAN网,提出了一种新的基于模糊逻辑的分布式、动态优先级闭环调度策略,从而在网络服务质量、带宽资源利用率和网络服务范围之间寻求一种折衷。?为适应网络化控制系统中网络负荷的波动及数据服务需求的变动,研究了基于Nash均衡和Pareto优化的柔性调度策略及其参数优化方法,从而提高了调度策略的适应性,实现了灵活、高效的网络服务。更多还原

【Abstract】 Motivated by higher and higher requirements on industrial applications, modern con-trol systems are becoming more and more complex and networked, control algorithmsmore and more sophisticated. Such industrial networked control systems are of integrated,which involves measurement, process control and optimization, production scheduling,management and decision. The framework makes it possible to share process data andmarketing information plant-widely, which improves availability, operating safety, relia-bility and environment protection of the production. Clearly, introducing networks intothe control systems changes not only message transmission modes but also dynamicsof the control systems. Moreover, to guarantee real-timeliness, reliability and operat-ing safety of the control systems, new requirements of quality of service(QoS) will beimposing on the networks.In this thesis, systematic works on the configuration of networked control systems,the analysis and synthesis problems for the networked control systems were considered.The issues of networks performance optimization were also addressed. The contributionsof the works are listed in the following.1. Chapter 1 concerned with the relationship between the structures of the industrialcontrol systems and the networks. The issues of real-timeliness, reliability andsafety of the control systems, communication protocols and their realizations ofsome typical industrial control networks were also studied in the chapter.2. For di?erent working modes of the networks and the control systems, generalsampling-data models were developed in the chapter 2. Based on these hybridmodels, the stability problems for the networked regular and singular linear controlsystems were considered. A less conservative time-delay dependent stability wereobtained in Chapter 2 for the systems considered.3. Moreover, we also concerned with the synthesis problems of the networked regularand singular linear systems for the di?erent operating modes of the networks andthe control systems in Chapter 2.4. From Chapter 3 to Chapter 5, the network scheduling problems were considered toimprove the QoS of the networks, and guarantee the real-timeliness and reliabilityof the control systems.? Subject to the bandwidth limitation and the requirement of real-time transmis-sion, a jitter-dependent bandwidth optimization problem for networked controlsystems was considered to guarantee the performance of the control systems,reduce the bandwidth occupancy and realize the service fairness. Taken theToken-based and CAN-based networks as examples, scheduling schemes, theirreliability and network stability were considered, respectively.? A new closed-loop, distributed priority fuzzy scheduling was proposed for CANnetworks, which makes a well tradeo? between the quality of service, bandwidthutility (network schedulability) and the service range of the networks. ? Based on Nash equilibrium and Pareto optimization methods, ?exible schedul-ing schemes were developed to adapt the ?uctuation of the network load andthe change of the service requirements, which improves the adaptation of thescheduling and provides a high e?cient and ?exible network service.更多还原