基于动态通信调度的网络化系统最优控制

针对存在介质访问约束的网络化控制系统,研究其中的控制和通信协同设计问题.将网络化控制系统建模为输入矩阵随介质约束而变化的切换系统,运用最优控制理论和切换系统分析方法,设计了可动态调度的最优控制器及实时切换规则,并分析了动态调度下闭环网络化控制系统的稳定性,最后通过仿真验证了该方法的有效性.     

具有多传输通道系统的网络化预测控制

本文研究了一类具有多传输通道网络化系统的控制问题,基于网络化预测控制方法,提出了一种改进型的分布式预测补偿方式,从而更有效地利用反馈数据来提高控制系统的性能.对闭环网络化预测控制系统进行分析,得到其稳定性条件,特别地,在模型精确已知和多传输通道的时延为定常的情况下,该条件将会退化为本地控制的闭环系统稳定性条件.上述结论的好处是网络化预测控制系统中状态观测器和控制器的设计可以参考本地控制.通过球杆系统算例验证本文所提方法的正确性和有效性.     

网络化预测控制系统的设计,分析与实时实现

采用预测控制策略, 讨论网络化控制系统的设计, 分析与实时实现. 对网络化控制系统的特点进行详细分析, 表明网络化控制系统与传统的控制系统有很大的不同. 为了达到期望的闭环网络化控制系统的性能, 引入网络化预测控制方案, 并对网络化预测控制系统的设计、稳定性分析和实时实现进行深入研究. 本文采用仿真和实际实验, 展示网络化预测控制方案可以弥补随机网络通信延迟和数据丢失、达到期望的控制性能、并具有良好的闭环系统稳定性.     

一种获取网络化控制系统最大允许延迟时间的新方法

提出了一种获取网络化控制系统最大允许延迟时间的新方法．该方法利用控制系统的时滞相关稳定性条件设计状态反馈控制器,得到最大允许延迟时间,并以线性矩阵不等式的形式描述．仿真实例表明了该方法是有效的,并降低了已有方法的保守性．     

具有状态观测器的网络化控制系统的设计

研究存在时变延迟和丢包的非理想网络传输情况下带状态观测器的网络化控制系统设计问题.提出一种基于分级控制结构的、具有本地状态观测器的网络化控制系统的设计方法,证明了基于分级控制结构的网络化控制系统满足分离定理的充分条件.该方法在降低系统设计难度的同时,有效改善了网络化控制系统的控制性能.数值仿真表明了所提出方法的有效性.     

网络系统中动态矩阵控制的稳定性条件

网络控制系统中的时滞和丢包会影响控制器的稳定性;因此,传统的动态矩阵控制器设计方法无法适应网络化环境.本文针对这一问题设计了一种改进型动态矩阵控制器.通过建立缓存器将不确定时滞转化为固定时滞;并提出了一种更新系统单位阶跃响应系数的方法,用来处理时滞对控制器的影响.采用一次性传输整个控制序列的方法,避免了丢包时需要更新控制量的问题.此外,进一步分析了该控制系统的稳定性问题,给出了考虑时滞和丢包信息的系统稳定性充分条件.最后通过实时仿真软件示范了如何确定允许的最大时滞和丢包.验证了该方法的有效性.     

基于网络QoS的网络化控制系统保性能控制

研究存在时延和丢包的非理想网络传输情况下的网络化控制系统的保性能控制问题,得到了在非理想网络传输情况下的网络化控制系统存在保性能控制律的充分条件,提出了基于网络服务质量(QoS)的网络化控制系统的保性能控制器的设计方法,该方法是一种能够兼顾系统控制性能和网络服务质量的综合性控制方法.通过仿真实例验证了该方法的有效性.     

基于双边闭环函数的网络化采样控制系统稳定性分析EI北大核心CSCD

考虑数据通信时延不确定环境下网络化采样控制系统的稳定性问题.首先基于输入时滞方法,建立包含采样周期信息的网络化采样控制系统的数学模型,在此基础上,采用双边闭环函数方法和自由矩阵积分不等式技术,得到网络传输时滞变化区间依赖稳定性新准则,并进一步讨论了网络化采样控制系统中网络时延与采样周期之间的关系.仿真结果表明减小采周期可以增强网络控制系统对网络通信时延的鲁棒性.     

网络化控制系统性能与网络QoS协调设计研究*

基于网络QoS如延迟、丢包,建立网络化控制系统状态方程,通过双线性矩阵不等式(BMI)讨论在某种网络QoS下控制系统的稳定性,并以离散系统二次型性能指标为例设计最优LQR(linear quadratic regulator)控制器,得到保证系统控制性能的网络QoS约束。针对该约束,提出一种能够兼顾系统性能与网络QoS的网络化控制系统控制与调度协调设计方法。最后,通过仿真实验说明提出的协调设计方法的必要性和有效性。     

等式约束的网络化控制系统的稳定性设计

研究了等式约束的网络化控制系统的稳定性问题．在假设网络时滞是随机变化的，并且假设网络化控制系统的被控对象为一个具有等式约束的时滞系统的情况下，将网络化控制系统模型化为一个混合系统．然后采用李亚普诺夫函数、线性矩阵不等式的方法推导出了该混合系统渐近稳定的一个充分条件．根据此充分条件，通过求解一个线性矩阵不等式，较容易地获得系统的最大允许网络时滞以及此时的控制器．最后给出一个具体的数值和仿真实例说明了此设计方法是有效的．     

State and Mode Feedback Control for Discrete-time Markovian Jump Linear Systems With Controllable MTPM

In this note, the state and mode feedback control problems for a class of discrete-time Markovian jump linear systems (MJLSs) with controllable mode transition probability matrix (MTPM) are investigated. In most achievements, controller design of MJLSs pays more attention to state/output feedback control for stability, while the system cost in practice is out of consideration. In this paper, we propose a control mechanism consisting of two parts: finite-path-dependent state feedback controller design with which uniform stability of MJLSs can be ensured, and mode feedback control which aims to decrease system cost. Differing from the traditional state/output feedback controller design, the main novelty is that the proposed control mechanism not only guarantees system stability, but also decreases system cost effectively by adjusting the occurrence probability of system modes. The effectiveness of the proposed mechanism is illustrated via numerical examples.      

鲁棒H-状态反馈控制

本文对结构参数不确定线性定常多变量系统的鲁棒Ｈ∞状态反馈设计问题进行了研究，给出了系统鲁棒稳定和干扰衰减的条件，及相应的鲁棒Ｈ∞状态反馈设计方法，并用这种方法设计了一个倒立摆平衡控制器。仿真结果表明，与ＬＱ设计方法相比，按本文所提出的设计方法得到的控制器具有鲁棒稳定能力强、闭环动态性能良好等优点。     

Asymptotic Stability and Finite‐Time Stability of Networked Control Systems: Analysis and Synthesis

This paper focuses on the problems of asymptotic stability and finite‐time stability (FTS) analysis, along with the state feedback controller design for networked control systems (NCSs) with consideration of both network‐induced delay and packet dropout. The closed‐loop NCS is modeled as a discrete‐time linear system with a time‐varying, bounded state delay. Sufficient conditions for the asymptotic stability and the FTS of the closed‐loop NCS are provided, respectively. Based on the stability analysis results, a mixed controller design method, which guarantees the asymptotic stability of the closed‐loop NCS in the usual case and the FTS of the closed‐loop NCS in the unusual case (that is, in some particular time intervals, large state delay occurs), is presented. A numerical example is provided to illustrate the effectiveness of the proposed mixed controller design method.     

Nonlinear robust state feedback control system design for nonlinear uncertain systems

This paper presents a systematic approach to the design of a nonlinear robust dynamic state feedback controller for nonlinear uncertain systems using copies of the plant nonlinearities. The technique is based on the use of integral quadratic constraints and minimax linear quadratic regulator control, and uses a structured uncertainty representation. The approach combines a linear state feedback guaranteed cost controller and copies of the plant nonlinearities to form a robust nonlinear controller with a novel control architecture. A nonlinear state feedback controller is designed for a synchronous machine using the proposed method. The design provides improved stability and transient response in the presence of uncertainty and nonlinearity in the system and also provides a guaranteed bound on the cost function. An automatic voltage regulator to track reference terminal voltage is also provided by a state feedback equivalent robust nonlinear proportional integral controller. Copyright © 2016 John Wiley & Sons, Ltd.     

H-infinity control for networked control systems （NCS） with time-varying delays

1Introduction Ina networkedcontrol system(NCS),a communicationnetwork connects sensors,actuators and controllers.AnNCS has many advantages over the point_to_pointcommunication of traditional control systems:fast and easymaintenance,low cost,greater flexibility,etc.Therefore,NCSs are increasingly being usedfor industrial control in avariety of fields[1,2].On the other hand,control loopsonthe communication network are closedin an NCS.Thetime delays that occur when information is transmitte…     

Nonlinear state feedback controller for nonlinear systems:Stability analysis and design based on fuzzy plant model

This paper presents the stability analysis of a fuzzy-model-based control system consisting of a nonlinear plant and a nonlinear state feedback controller and the design of the nonlinear gains of the controller. The nonlinear plant is represented by a fuzzy model having p rules. A nonlinear state feedback controller is designed to close the feedback loop. Under this design, the stability condition is reduced to p linear matrix inequalities. An application example on stabilizing a mass-spring-damper system will be given     

基于LS-SVM的非线性系统自适应输出反馈控制

针对状态不可测的单输入单输出非线性不确定系统,提出一种基于最小二乘支持向量机(LS-SVM)的直接自适应输出反馈控制方法.该方法首先设计一种误差观测器,间接地估计出系统的状态,然后采用最小二乘支持向量机构造自适应控制器,控制器参数的在线调整规律由李亚普诺夫稳定性理论导出.文中严格证明了闭环系统的渐近稳定性,仿真研究表明了此控制方法的可行性和有效性.     

H-infinity control for networked control systems (NCS) with time-varying delays

This paper discusses H-infin it y state feedback control for a networked control system with time-varying delays.Based on the free-weighing matri x method,a delay-dependent stability criterion satisfying a prescribed H-infini ty norm bound is presented for an NCS with unknown,time-varying and bounded del ays.And then,the criterion is transformed into suffici ent conditions based on linear matrix inequalities f or H-infinity control.The conditions thus obtained a re also used to design an H-infinity state feed back controller.This design method is further extend ed to solve the design problem of robust H-infin ity state feedback control.A numerical example demo nstrates the validity of the method.     

A new approach to robust and non-fragile H∞ control for uncertain fuzzy systems

This paper investigates the robust H_∞ control and non-fragile control problems for Takagi-Sugeno (T-S) fuzzy systems with linear fractional parametric uncertainties. The robust H_∞ control problem is to design a state feedback controller such that the robust stability and a prescribed H_∞ performance of the resulting closed-loop system is ensured. And the non-fragile H_∞ control problem is to design a state feedback controller with parameter uncertainties. Based on the linear matrix inequality (LMI) approach, new sufficient conditions for the solvability of the two problems are obtained. It is shown that the desired state feedback fuzzy controller can be constructed by solving a set of LMIs. Numerical examples are also provided to demonstrate the effectiveness of the proposed design method.     

随机型不确定中立时滞系统的鲁棒H∞控制

研究了一类具有不确定性的随机性中立时滞系统的鲁棒H∞状态反馈控制器的设计问题.假设时滞是已知的,且时滞同时出现在状态变量和控制变量中,利用线性矩阵不等式方法,给出了状态反馈控制器存在的时滞依赖的充分条件,保证了对于所有的参数不确定性,闭环系统是指数均方稳定的,且从干扰输入到被控输出的影响小于一个指定的性能指标.仿真算例验证了该方法的可行性.