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decentralized control design and implementation for magnetic levitation systems with extended state observer

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control Theory and Technology 2023年第3期21卷 397-413页

作者： Qiang Chen Qing Yang Mingxin Liu Peichang Yu Lianchun Wang Danfeng Zhou Jie Li Ying Tan College of Intelligence Science and Technology National University of Defense TechnologyChangsha 410073HunanChina Hunan Provincial Key Laboratory of Electromagnetic Levitation and Propulsion Technology Changsha 410073HunanChina Northwest Institute of Mechanical and Electrical Engineering Xianyang 712099Shaan'xiChina Melbourne School of Engineering The University of MelbourneMelbourne VIC 3010Australia

This paper focuses on control design and synthesize for a class of magnetic levitation systems,which have a decentralized control for each suspension *** to the existence of mechanical coupling among four suspension points,large modeling uncertainties,unpredictable disturbances during the operation,and measurement noises,becomes *** estimate and compensate for the effects of lumped uncertainties,this study employs the extended state observer(ESO)in conjunction with active disturbance rejection control(ADRC).Specifically,a novel ESO is proposed that utilizes output signals and their derivatives to estimate the lumped uncertainties more accurately,which simplifies the convergence proof conditions and has well engineering *** article is written in honor of *** on the occasion of his 60th ***,this paper is inspired by his pioneering work on composite nonlinear feedback,which combines linear feedback and nonlinear compensator to enhance system performance Chen et al.(IEEE Trans Autom control,40:427-439,2003).

关键词： Magnetic levitation systems Extended state observer Active disturbance rejection control decentralized control

decentralized control for linear systems with multiple input channels

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Science China(Information Sciences) 2019年第5期62卷 169-178页

作者： Juanjuan XU Liang XU Lihua XIE Huanshui ZHANG School of control Science and Engineering Shandong University School of Electrical and Electronic Engineering Nanyang Technological University

In this paper, we consider the decentralized optimal control problem for linear discrete-time systems with multiple input channels. First, under centralized control, the optimal feedback gains are given in terms of two algebraic Riccati equations. A reduced order observer is then designed using only the local input and output information. By selecting an appropriate initial value for the observer, we derive an observer-based decentralized optimal controller where the feedback gain is the same as that obtained in the centralized optimal control problem. Last but not least, we study the optimal control problem of non-homogeneous multi-agent systems as an application. A suboptimal decentralized controller is obtained and the difference between the suboptimal cost and the optimal one is given.

关键词： decentralized control reduced order observer multiple channels algebraic Riccati equation

decentralized control of Discrete-Time System with Delay in Mean Field LQR Problem

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Journal of Systems Science & Complexity 2015年第4期28卷 755-772页

作者： ZHANG Fangfang WANG Wei School of control Science and Engineering Shandong University

This paper studies the decentralized optimal control of discrete-time system with input delay,where a large number of agents with the identical decoupling dynamical equations and the coupling cost function through the mean field are *** decentralized and centralized optimal controllers are proposed by the optimal tracking control of LQR problem with *** are proved that the optimal controllers and the optimal cost function of the centralized and decentralized solutions are equivalent for the optimal control *** illustrative example is given to show the efficiency of the decentralized optimal controllers.

关键词： decentralized control discrete-time system input delay mean field.

decentralized control of two DC microgrids interconnected with tie-line

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Journal of Modern Power Systems and Clean Energy 2017年第4期5卷 599-608页

作者： Sujan ADHIKARI Qianwen XU Yi TANG Peng WANG Xiaoqiang LI Nanyang Technological University Singapore 639798Singapore

This paper examines the interconnection of two DC microgrids(MGs) with tie-line. The voltages at respective MG buses are controlled to manage the powerflow across the tie-line. Formation of such a DC MG cluster ensures higher reliability of power supply andflexibility to manage distributed energy resources and loads in the system. Two MGs consist of photovoltaic and battery units interfaced by power electronic converters. The bus voltages of two DC MGs act as an indicator for the powerflow monitoring the supply-demand balance. A decentralized control approach is proposed to control each MG and bus voltage fluctuation in an allowable range. Furthermore,a mode adaptive decentralized control approach is proposed for seamless mode transition in order to assign microgrid operation modes and for the power management of DC MGs. The effectiveness of the proposed concept is validated by simulation and experimental results.

关键词： Interconnected DC microgrids decentralized control Tie-line Bus voltages Mode transition

decentralized control for a Class of Discrete-time Fuzzy Bilinear Interconnected Large-scale Systems

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Decentralized Control for a Class of Discrete-time Fuzzy Bil...

Optimal decentralized control of large scale systems

第26届中国控制与决策会议

作者： Chen Wenqing Zhang Guo Zhang Yanhua Deparrtment of Electrical Engineering and Automation Luoyang Institute of Science and Technology

ISBN: (纸本)9781479937066

This paper presents the problem of decentralized feedback control for a class of discrete-time fuzzy bilinear interconnected large-scale systems. Based on the Lyapunov stability analysis theory and the parallel distribute compensation（PDC） scheme, some sufficient stabilization conditions are derived for the whole close-loop fuzzy interconnected systems. The V-K iteration method is employed to convert the corresponding decentralized fuzzy controller design into a convex optimization problem with linear matrix inequality（LMI） constraints..

关键词： fuzzy bilinear interconnected system decentralized control linear matrix inequality(LMI)

来源： cnki会议评论

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control Theory and Technology 2016年第4期14卷 287-313页

作者： Xiao Qi SHI Daniel E. DAVISON Raymond KWONG Edward J. DAVISON Systems control Group Department of Electrical and Computer Engineering University of Toronto Ontario Canada MSS 3G4 Department of Electrical and Computer Engineering University of Waterloo Ontario Canada N2L 3G1

This paper presents a new optimized decentralized controller design method for solving the tracking and disturbance rejection problems for large-scale linear time-invariant systems, using only low-order decentralized controllers. To illustrate the type of results which can be obtained using the new optimized decentralized control design method, the control of a large flexible space structure is studied and compared with the standard centralized LQR-observer controller. The order of the resultant decentralized controller is much smaller than that of the standard centralized LQR-observer controller. The proposed controller also has certain fail-safe properties and, in addition, it can be five orders of magnitude more robust than the standard LQR-observer controller based on their real stability radii. The new decentralized controller design method is applied to a large flexible space structure system with 5 inputs and 5 outputs and of order 24.

关键词： decentralized control multivariable control PID control robustness optimization large-scale systems flexiblestructures

decentralized control of Dynamic Routing with a Neural Network Algorithm

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The Journal of China Universities of Posts and Telecommunications 2000年第1期7卷 46-50页

作者： XIN Zhan-hong, FANG Mei-qin (School of Management and Humanities, Beijing University of Posts and Telecommunications, Beijing 100876, P. R. China) School of Management and Humanities Beijing University of Posts and Telecommunications Beijing 100876 P. R. China

A state-dependent routing algorithm based on the neural network model, which takes advantage of other dynamic routing algorithm for circuit-switched network, is given in [1]. But, the Algorithm in [1] is a centralized control model with complex O (N 7), therefore, is difficult to realize by hardware. A simplified algorithm is put forward in this paper, in which routing can be controlled decentralizedly, and its complexity is reduced to O (10N 3). Computer simulations are made in a fully connected test network with eight nodes. The results show that the centralized control model has very effective performance that can match RTNR, and the centralized control model is not as good as the centralized one but better than DAR-1.

关键词： neural network circuit-switched network dynamic routing decentralized control

Stability analysis and decentralized control of inverter-based ac microgrid

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Protection and control of Modern Power Systems 2019年第1期4卷 65-88页

作者： Mehdi Farokhian Firuzi Alireza Roosta Mohsen Gitizadeh Shiraz University of Technology ShirazIran

This work considers the problem of decentralized control of inverter-based ac micro-grid in different operation *** main objectives are to(i)design decentralized frequency and voltage controllers,to gather with power sharing,without information exchange between microsources(ii)design passive dynamic controllers which ensure stability of the entire microgrid system(iii)capture nonlinear,interconnected and large-scale dynamic of the micro-grid system with meshed topology as a port-Hamiltonian formulation(iv)expand the property of shifted-energy function in the context of decentralized control of ac micro-grid(v)analysis of system stability in large signal point of *** precisely,to deal with nonlinear,interconnected and large-scale structure of micro-grid systems,the port-Hamiltonian formulation is used to capture the dynamic of micro-grid components including microsource,distribution line and load dynamics as well as interconnection ***,to deal with large signal stability problem of the microgrid system in the grid-connected and islanded conditions,the shifted-Hamiltonian energy function is served as a storage function to ensure incremental passivity and stability of the microgrid ***,it is shown that the aggregating of the microgrid dynamic and the decentralized controller dynamics satisfies the incremental ***,the effectiveness of the proposed controllers is evaluated through simulation *** different scenarios including grid-connected and islanded modes as well as transition between both modes are *** simulation conforms that the decentralized control dynamics are suited to achieve the desired objective of frequency synchronization,voltage control and power sharing in the grid-connected and islanded *** simulation results demonstrate the effectiveness of the proposed control strategy.

关键词： decentralized control Inverter-based ac micro-grid Frequency and voltage control Active and reactive power sharing Incremental passivity Port-Hamiltonian framework Shifted-energy function

MODAL SYNTHESIS METHOD FOR NORM COMPUTATION OF H_∞ decentralized control SYSTEMS (II)

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Applied Mathematics and Mechanics(English Edition) 2004年第2期25卷 123-134页

作者：钟万勰吴志刚高强梁以德 F.W.Williams State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Department of Building and Construction City University of Hong Kong

When using H_∞ techniques to design decentralized controllers for large systems, the whole system is divided into subsystems, which are analysed using H_∞ control theory before being recombined. An analogy was established with substructural analysis in structural mechanics, in which H_∞ decentralized control theory corresponds to substructural modal synthesis theory so that the optimal H_∞ norm of the whole system corresponds to the fundamental vibration frequency of the whole structure. Hence, modal synthesis methodology and the extended Wittrick_Williams algorithm were transplanted from structural mechanics to compute the optimal H_∞ norm of the control system. The orthogonality and the expansion theorem of eigenfunctions of the subsystems H_∞ control are presented in part (Ⅰ) of the paper. The modal synthesis method for computation of the optimal H_∞ norm of decentralized control systems and numerical examples are presented in part (Ⅱ).

关键词： H_∞ control decentralized control modal synthesis generalized Rayleigh quotient extended Wittrick-Williams algorithm