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New Delay-Dependent Criteria for Robust Stability of Uncertain Singular Systems

IFAC Proceedings Volumes 2008年第2期41卷 2484-2489页

作者： Gao Jinfeng Su Hongye Ji Xiaofu Chu Jian State Key Laboratory of Industrial Control Technology Institute of Advanced Process Control Zhejiang University Yuquan Campus Hangzhou 310027 P.R. China Institute of Automation Zhejiang Sci-Tech University Hangzhou 310018 P.R. China School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 P.R. China

This note concerns the delay-dependent robust stability analysis for uncertain singular time-delay systems. The parameter uncertainty is assumed to be norm-bounded and possibly time-varying, while the time delay considered here is assumed to be constant but unknown. By using a new Lyapunov-krasovskii functional which splits the whole delay interval into two subintervals and defines a different energy function on each subinterval, some delay-dependent conditions are presented for the singular time-delay system to be regular, impulse free and robustly stable. The obtained delay-dependent criteria are effective and less conservative than previous ones, which are illustrated by numerical examples.

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New Delay-dependent Absolute Stability Criteria for Lurie control Systems

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Acta Automatica Sinica 2008年第10期34卷 1275-1280页

作者： Jin-Feng GAO Hong-Ye SU Xiao-Fu JI Jian CHU Institute of Automation Zhejiang Sci-Tech University Hangzhou 310018 P. R. China State Key Laboratory of Industrial Control Technology Institute of Advanced Process Control Zhejiang University Yuquan Campus Hangzhou 310027 P. R. China School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 P. R. China

This note is concerned with the absolute stability analysis for time-delay Lurie control systems with nonlinearity located in an infinite sector and finite one. By using a new Lyapunov-Krasovskii functional that splits the whole delay interval into two subintervals and defines a different energy function on each subinterval and introducing some free-weighting matrices, some new delay-dependent robustly absolute stability criteria are presented in terms of strict linear matrix inequalities (LMIs). The obtained delay-dependent criteria are less conservative than previous ones, as are illustrated by numerical examples.

关键词： Lurie control system delay-dependent criterion absolute stability uncertainty linear matrix inequality (LMI)

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Generalized Predictive control with Online Least Squares Support Vector Machines

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自动化学报 2007年第11期33卷 1182-1188页

作者： LI Li-Juan SU Hong-Ye CHU Jian State Key Laboratory of Industrial Control Technology Institute of Advanced Process Control Zhejiang University Hangzhou 310027 P. R. China College of Automation Nanjing University of Technology Nanjing 210009 P. R. China

这份报纸基于能有效地处理非线性的系统的联机最少的广场支持向量机器(LS-SVM ) 建议一个实际概括预兆的控制(GPC ) 算法。在每个采样时期，算法递归地由增加新数据对并且在实时性质上从考虑删除最不重要的修改模型。删除的数据对被 lag... 详细信息

这份报纸基于能有效地处理非线性的系统的联机最少的广场支持向量机器(LS-SVM ) 建议一个实际概括预兆的控制(GPC ) 算法。在每个采样时期，算法递归地由增加新数据对并且在实时性质上从考虑删除最不重要的修改模型。删除的数据对被 lagrange 的绝对值从最后一个采样时期更多样地决定。当增加新数据对并且删除存在的时，纸给模型参数的递归的算法分别地，一个大矩阵的倒置被避免，存储器能被算法完全控制。非线性的 LS-SVM 模型在每个采样时期在 GPC 算法被使用。抵销过程的 pH 上的概括预兆的控制的实验显示出建议算法的有效性和实物。

关键词：普遍预测控制支持向量机联机模型 pH补偿过程模糊控制

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Optimal RGC control with Regional Poles and control Input Constraints:the Actuator Failure Case

Optimal RGC Control with Regional Poles and Control Input Co...

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2007 IEEE International Conference on automation and Lofistics

作者： Shu-Wen Pan Hong-Ye Su Deng-Feng Zhang Zhi-Quan Wang Institute of Advanced Process Control Zhejiang University Hangzhou Zhejiang ProvinceChina School of Automation Nanjing University of Science and Technology Nanjing Jiangsu ProvinceChina

ISBN: (纸本)9781424415304

Based on linear matrix inequalities (LMI) approach,the problem of optimal reliable guaranteed cost (RGC) control with control input and regional poles constraints is investigated for a class of uncertain discrete-time systems subject to actuator *** state-feedback controller is designed to meet the given upper bounds on the amplitudes of control signals and guarantee,for all admissible time-varying uncertainties and possible actuator failures,the closed-loop system satisfying the pre-specified regional pole index and having the optimal quadratic cost ***,with the constrained control input,the resulting closed-loop system can provide satisfactory stability,transient property and cost performance despite of possible actuator faults.

关键词： Actuator failure control constraints guaranteed cost control LMI reliable control

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A New Method to Solve Robust Data Reconciliation in Nonlinear process

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Chinese Journal of Chemical Engineering 2006年第3X期14卷 357-363页

作者：周凌柯苏宏业褚健 Department of Automation Nanjing University of Science ＆ Technology Nanjing 210094 China Institute of Advanced Process Control Zhejiang University Hangzhou 310027 China

Data reconciliation is an effective technique for providing accurate and consistent value for chemical process. However, the presence of gross errors can severely bias the reconciled results. Robust estimators can significantly reduce the effect of gross errors and yield less-biased results. In this article, a new method is proposed to solve the robust data reconciliation problem of nonlinear chemical process. By using several technologies including linearization method, penalty function, virtual observation equation, and equivalent weights method, the robust data reconciliation problem can be transformed into least squares estimator problem which leads to the convenience in computation. Simulation results in a nonlinear chemical process demonstrate the efficiency of the proposed method.

关键词： data reconciliation robust estimator equivalent weights method

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control of a distillation column: A decentralized approach

Control of a distillation column: A decentralized approach

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IEEE International Conference on Computer-Aided Design

作者： Iman Makaremi Batool Labibi Advanced Automation and Digital Control Laboratory Control Department Electrical Engineering Faculty K.N. Toosi University of Technology Tehran Iran Process Control Laboratory Control Department Electrical Engineering Faculty K.N. Toosi University of Technology Tehran Iran

This paper presents a decentralized controller for a binary distillation column. The interactions between subsystems are considered as uncertainty. Then appropriate local H infin problems are defined such that by solving them and applying the designed controller to the system, closed-loop stability and diagonal dominance are guaranteed

关键词： Distillation equipment control systems MIMO Distributed control Uncertainty Stability Digital control Automatic control Isolation technology process control

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A Modified Outlier Detection Method in Dynamic Data Reconciliation

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Chinese Journal of Chemical Engineering 2005年第4期13卷 542-547页

作者：周凌柯苏宏业褚健 Department of Automation Nanjing University of Science & Technology Institute of Advanced Process Control Zhejiang University Hangzhou 310027 China Institute of Advanced Process Control Zhejiang University

Data reconciliation technology can decrease the level of corruption of process data due to measurement noise, but the presence of outliers caused by process peaks or unmeasured disturbances will smear the reconciled results. Based on the analysis of limitation of conventional outlier detection algorithms, a modified outlier detection method in dynamic data reconciliation (DDR) is proposed in this paper. In the modified method, the outliers of each variable are distinguished individually and the weight is modified accordingly. Therefore, the modified method can use more information of normal data, and can efficiently decrease the effect of outliers. Simulation of a continuous stirred tank reactor (CSTR) process verifies the effectiveness of the proposed algorithm.

关键词： data reconciliation outlier detection gross error

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Parameter estimation for nonlinear dynamic systems from a feedback control viewpoint

Parameter estimation for nonlinear dynamic systems from a fe...

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5th International Conference on control and automation, ICCA'05

作者： Zhu, Xuemei Wang, Shuqing Li, Pu Wozny, Günter College of Electrical and Automation Engineering Nanjing Normal University Nanjing 210042 China Institute of Advanced Process Control Zhejiang University Hangzhou 310027 China Institute of Process and Plant Technology Technical University of Berlin KWT9 10623 Berlin Germany

ISBN: (纸本)0780391381

The estimation of time-variant parameters in nonlinear models remains as an open problem. In this work, we propose a new approach to addressing this problem by tuning weighting factors in the least-squares dynamic optimization. Through analysis of the solution procedure of the resulting optimization problem, it is found that parameter estimation with a weighted least-squares method is equivalent to a multi-variable closed-loop control system. The weighting factors in the objective function are equivalent to the controller parameters. Like any control system synthesis, the tuning can be made based on the output-input sensitivity analysis. The effectiveness of the approach is illustrated by estimating tray efficiencies and feed composition of a heat-integrated distillation column system. © 2005 IEEE.

关键词： Parameter estimation

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Parameter estimation for nonlinear dynamic systems from a feedback control viewpoint

Parameter estimation for nonlinear dynamic systems from a fe...

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International Conference on control and automation (ICCA)

作者： Xuemei Zhu Shuqing Wang Pu Li G. Wozny College of Electrical and Automation Engineering Nanjing Normal University Nanjing China Institute of Advanced Process Control University of Zhejiang Hangzhou China Institute of Process and Plant Technology Technical University Berlin Berlin Germany

关键词： Parameter estimation Feedback control Nonlinear dynamical systems Optimization methods process control Maximum likelihood estimation Constraint optimization control systems control system synthesis Sensitivity analysis

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Performance assessment of model predictive control in industrial distillation column

Performance assessment of model predictive control in indust...

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WCICA 2004 - Fifth World Congress on Intelligent control and automation, Conference Proceedings

作者： Yang, Maying Jin, Xiaoming Chen, Fei Automation Department Information Engneering College Zhejiang University of Technology Hangzhou 310032 China Natl. Key Lab. Indust. Contr. T. Inst. of Advanced Process Control Zhejiang University Hangzhou 310027 China

A synthetical method of multivariable control system performance assessment is proposed in, this paper, which uses multivariable Minimum Variance control (MVC) benchmark to determine the stochastic performance, and Normalized Multivariate Impulse Response (NMIR) curve as an alternative measure of performance to test the dynamic performance, and with the help of Auto-Correlation Function (ACF) and Cross-Correlation Function (CCF) to analyse if there are oscillations exist. The method is applied to assess performance of multivariable predictive control system of industrial distillation column.

关键词： Distillation columns

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