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Design of active disturbance rejection internal model control strategy for SISO system with time delay process

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Journal of Central South University 2015年第5期22卷 1725-1736页

作者：靳其兵刘立业 Information Science and Technology College Beijing University of Chemical and Technology

A novel control scheme of active disturbance rejection internal model control(ADRIMC) is proposed to improve the anti-interference ability and robustness for the dead-time process. The active anti-interference concept is introduced into the internal model control(IMC) by analyzing the relationship between IMC and disturbance observer control(DOB). Further, a design process of disturbance filter is presented to realize the active anti-interference ability for ADRIMC scheme. The disturbance filter is used to estimate an equivalent disturbance consisting of both external disturbances and internal disturbances caused by model *** results demonstrate that the proposed method possesses a good disturbance rejection performance, though losing some partial dynamic performance. In other words, the proposed method shows a tradeoff between the dynamic performance and the system robust.

关键词： internal model control (IMC) disturbance observer (DOB) active disturbance rejection internal model controller(ADRIMC) low pass filter (LPF) robusmess

Analysis on Refinery System as a Complex Task-resource Network

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Chinese Journal of Chemical Engineering 2013年第3期21卷 253-262页

作者：刘苏昱荣冈 Department of Control Science and Engineering Institute of Cyber-System and Control State Key Laboratory ofIndustrial Control Technology Zhejiang University Hangzhou 310027 China

Refinery system, a typical example of process systems, is presented as complex network in this paper. The topology of this system is described by task-resource network and modeled as directed and weighted graph, in which nodes represent various tasks and edges denote the resources exchanged among tasks. Using the properties of node degree distribution, strength distribution and other weighted quantities, we demonstrate the heterogeneity of the network and point out the relation between structural characters of vertices and the functionality of correspond- ing tasks. The above phenomena indicate that the design requirements and principles of production process contrib- ute to the heterogeneous features of the network. Besides, betweenness centrality of nodes can be used as an impor- tance indicator to provide additional information for decision making. The correlations between structure and weighted properties are investigated to further address the influence brought by production schemes in system con- nectivity patterns. Cascading failures model is employed to analyze the robustness of the network when targeted at- tack happens. Two capacity assignment strategies are compared in order to improve the robustness of the network at certain cost. The refinery system displays more reliable behavior when the protecting strategy considers heteroge- neous properties. This phenomenon further implies the structure-activity relationship of the refinery system and provides insightful suggestions for process system design. The results also indicate that robustness analysis is a _promising applicat!on of methodologies from complex networks to process system engineering..

关键词： zomplex network refinery system structure-activity relationship heterogeneity robusmess

Robustness analysis of control systems with disc uncertainties

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控制理论与应用（英文版） 2005年第4期3卷 327-333页

作者： Zhizhen WANG Long WANG Wensheng YU Department of Applied Mathematics Shanghai Normal University Shanghai 200234 China Department of Mechanics and Engineering Sciences Peking University Beijing 100871 China Laboratory of Complex Systems and Intelligence Sciences Institute of Automation Chinese Academy of Sciences Beijing 100080 China

For a class of control systems with disc uncertainties, robust performance anaysis is developed. On the strictly positive realness and H-infinity-norm of uncertain systems, from the geometric point of view, two new sufficient and necessary conditions are given. The largest H-infinity-norm bound, containing the coefficients of only stable polynomials and centered at a nominal stable point in the coecient space is found. The results obtained in the paper are tractable and concise, which is illustrated by some numerical examples.

关键词： robusmess Disc polynomial Strictly positive realness Hurwitz stability H-infinity-norm