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International symposium on Intelligent Information Technology Application, IITA

作者： Lilian Huang Qitian Yin Linyu Wang Yongqing Fu College of Information and Communication Engineering Harbin Engineering of Technology Harbin Heilongjiang China

Based on observer, an adaptive controller with parameters identification for a class of chaotic systems with unknown parameters is proposed in this paper. The states of chaotic system are successfully estimated by a nonlinear observer with the proposed control and unknown parameters are also to be adapted to their values. Linear matrix inequality (LMI) approach is used to design the observer-based control and the observer gain can be given from LMI feasible solution. Simulation results on Rossler system have verified the efficiency of the proposed scheme.

关键词： Parameter estimation Chaos Chaotic communication Adaptive control control systems Programmable control Communication system control observers nonlinear control systems Error correction

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observer-based nonlinear controller for a three-phase Voltage-Source Converter feeding a constant power load

Observer-based nonlinear controller for a three-phase Voltag...

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IEEE International symposium on Industrial Electronics (ISIE)

作者： A. E. Leon J. A. Solsona M. I. Valla Departamento de Ingeniería Eléctrica y de Computadoras Instituto de Investigaciones en Ingeniería Eléctrica IIIE-UNS-CONICET Bahia Blanca Argentina LEICI Facultad de IngenieríaCONICET Universidad Nacional de La Plata La Plata Argentina

In this paper an observer-based controller for voltage source converters (VSCs) feeding constant power loads is introduced. The observer is used for estimating the power load and this estimate is feed forwarded to build a nonlinear controller in order to improve the whole system performance. The proposed observer presents linear error dynamics. The main advantage of our proposal is that linear error dynamics allows to design the observer by using linear techniques. In this way, the observer transient performance (i. e. speed of convergence) is clearly established in the whole range of VSC operation. The feedback controller is based on input-output feedback linearization considering an energy output. In this way, complete input-output linearization is obtained such that linear control strategies can be used in outer loops. Simulation results including performance in presence of commutation frequency, measurement filters delays, and parameters uncertainties are presented to validate the proposed technique.

关键词： Voltage control Converters Power conversion nonlinear dynamical systems Feeds nonlinear control systems control systems System performance Proposals Convergence

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Sliding Mode observer design for Discrete-time nonlinear Uncertain Systems via Sliding Mode Prediction

Sliding Mode Observer Design for Discrete-time Nonlinear Unc...

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2008 IEEE International symposium on Knowledge Acquisition and Modeling Workshop(KAM 2008)

作者： Lingfei Xiao College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing,Jiangsu,210016,ChinaHongye Su National Laboratory of Industrial control Technology,Institute of Advanced Process control,Zhejiang University,Hangzhou,Zhejiang,310027,China

Based on a creative sliding mode prediction model,a novel sliding mode observer (SMO) design method for discrete-time nonlinear uncertain systems is presented in this *** combining feedback correction approach,the observer states can close to system states as exactly as possible,and chattering is eliminate *** of the employing of receding horizon optimization technique,the observer compensatory term can be optimized continuously and *** proposed method guarantees the SMO is robustly *** satisfying properties of the SMO are verified by a numerical example.

关键词： sliding mode observer discrete-time nonlinear uncertain systems

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Sliding mode autopilot and observer design for a supersonic flight vehicle

Sliding mode autopilot and observer design for a supersonic ...

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International symposium on Systems and control in Aerospace and Astronautics (ISSCAA)

作者： M. Bahrami B. Ebrahimi G. R. Ansarifar J. Roshanian Department of Mechanical Engineering Amirkabir University of Technology슠 Tehran Iran Aerospace Research Institute Ministry of Science Research and Technology Tehran Iran Department of Aerospace Engineering K.N. Toosi University of Technology Tehran Iran

design and synthesis of a nonlinear supersonic missile longitudinal dynamics control for angle-of-attack output tracking are presented. In addition a sliding mode observer is designed to estimate the angle-of-attack which is difficult to measure in practice. The employed method is simple to implement in practical applications and enables the sliding mode control design to exhibit the desired dynamic properties during the entire output-tracking process independent of perturbations. Results of simulations are presented to demonstrate the performance, robustness, and stability of the considered autopilot.

关键词： Satellites Space vehicles Space technology Propulsion Costs Orbital robotics Space missions Rockets Gravity Equations

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nonlinear body slip angle observer for electric vehicle stability control

Nonlinear body slip angle observer for electric vehicle stab...

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23rd International Battery, Hybrid and Fuel Cell Electric Vehicle symposium and Exposition 2007 - Sustainability: The Future of Transportation, EVS 2007

作者： Geng, Cong Hori, Yoichi Department of Electrical Engineering University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-8656 Japan Institute of Industrial Science University of Tokyo 4-6-1 Komaba Meguro-ku Tokyo 153-8505 Japan

ISBN: (纸本)9781605607931

This paper proposes a nonlinear observer for Body Slip Angle (β) estimation, in which a nonlinear tire model is adopted for the observer design. A newly developed method to identify parameters of road surface friction coefficient (μ) is introduced into this observer, which makes the observer adaptive to road condition changing. Simulations and field test are conducted where the feasibility of μ identification and effectiveness of the observer arc checked, especially for nonlinear cornering situations. Copyright © (2007) by the Electric Drive Transportation Association.

关键词： Friction

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Discrete-time output trajectory tracking for induction motor using a neural observer

Discrete-time output trajectory tracking for induction motor...

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2007 IEEE 22nd International symposium on Intelligent control, ISIC 2007

作者： Alanis, Alma Y. Sanchez, Edgar N. Loukianov, Alexander G. CINVESTAV Unidad Guadalajara Apartado Postal 31-438 Plaza La Luna Guadalajara Jalisco O.P. 45091 Mexico CINVESTAV Unidad Guadalajara CU-CEI Universidad de Guadalajara Mexico

ISBN: (纸本)142440441X

This paper presents the design of an adaptive controller based on the block control technique, and a new neural observer for a class of MIMO discrete-time nonlinear systems. The observer is based on a recurrent high-order neural network (RHONN), which estimates the state vectors of the unknown plant dynamics. The learning algorithm for the RHONN is based on an Extended Kaiman Filter (EKF). This paper also includes the respective stability analysis, using the Lyapunov approach, for the whole system, which includes the non-linear plant, the neural observer trained with the EKF and the block controller. Applicability of the proposed scheme is illustrated via simulation for a discrete-time nonlinear model of an electric induction motor. © 2007 IEEE.

关键词： Induction motors

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Improved MRAS-type speed estimator for the sensorless induction motor drive

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COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING 2007年第4期26卷 1161-1174页

作者： Orlowska-Kowalska, T. Dybkowski, M. Wroclaw Tech Univ Inst Elect Elect Machines Drives & Measurements Wroclaw Poland

Purpose - This paper aims to obtain an accurate and robust estimation method of the rotor flux and speed for the sensorless induction motor (IM) drive. design/methodology/approach - The reduced order observer has been used as an online tuned rotor flux model in the model reference adaptive system (MRAS) concept applied for the IM speed estimation. The output of this observer was used also as a feedback signal required in the direct field-oriented control (DFOC) structure of the IM. Findings - It is shown that a new rotor flux and speed estimator are more robust to motor parameter changes in comparison with the classical MRAS estimator and can work stably in the DFOC structure, in the wide speed range, even for relatively high (50 per cent) identification errors of equivalent circuit parameters of the IM. Research limitations/implications - The investigation looked mainly at the estimation accuracy performance and whole system stability while economic issues will still need to be addressed. Practical implications - The proposed new improved MRAS speed estimator can be easily realised using modern digital signal processors. The implementation was tested in an experimental set-up with floating point DSP used as the system controller. The fixed-point realisation needs to be developed to obtain the practical application in the industrial drive systems. Originality/value - The application of the reduced order flux observer as a tuned flux model in the MRAS type speed estimator instead of the simple, but very sensitive to motor parameter uncertainties, current flux model, enables much better accuracy and stability of the rotor speed estimation in the complex DFOC structure than in the case of classical MRAS estimator.

关键词： induction motors estimation observer MRAs

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Dissipativity-based observer and feedback control design for a class of chemical reactors 8th

Dissipativity-based observer and feedback control design for...

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8th IFAC symposium on Dynamics and control of Process Systems, 2007

作者： Schaum, Alexander Moreno, Jaime A. Díaz-Salgado, Jorge Alvarez, Jesus Universidad Autónoma de México México D.F. Mexico Universidad Autónoma Metropolitana Iztapalapa Mexico D.F. Mexico

The problem of controlling exothermic continuous chemical reactors with non-monotonic reaction rate and temperature measurement is addressed within a dissipativity-passivity theoretical framework, yielding an output-feedback dynamic controller made of a nonlinear passive state-feedback controller combined with a nonlinear dissipative observer. The proposed approach is put in perspective with previous nonlinear controllers and is illustrated with a representative example through simulations. © Copyright 2007 IFAC.

关键词： Chemical reactors

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Near optimal neural network-based output feedback control of affine nonlinear discrete-time systems

Near optimal neural network-based output feedback control of...

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2007 IEEE 22nd International symposium on Intelligent control, ISIC 2007

作者： Qinmin, Yang Jagannathan, S. Department of Electrical and Computer Engineering University of Missouri Rolla MO 65401 United States

ISBN: (纸本)142440441X

In this paper, a novel online reinforcement learning neural network (NN)-based optimal output feedback controller, referred to as adaptive critic controller, is proposed for affine nonlinear discrete-time systems, to deliver a desired tracking performance. The adaptive critic design consist of three entities, an observer to estimate the system states, an action network that produces optimal control input and a critic that evaluates the performance of the action network. The critic is termed adaptive as it adapts itself to output the optimal cost-to-go function which is based on the standard Bellman equation. By using the Lyapunov approach, the uniformly ultimate boundedness (UUB) of the estimation and tracking errors and weight estimates is demonstrated. The effectiveness of the controller is evaluated for the task of nanomanipulation in a simulation environment. ©2007 IEEE.

关键词： Discrete time control systems

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design of a sliding mode neurocontroller for a nuclear research reactor 8th

Design of a sliding mode neurocontroller for a nuclear resea...

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8th IFAC symposium on Dynamics and control of Process Systems, 2007

作者： Pérez-Cruz, J. Humberto Poznyak, Alexander Department of Automatic Control CINVESTAV-IPN AP. 14740 Av. Instituto Politecnico Nacional No. 2508 México D.F.C.P. 07360 Mexico

This paper presents the application of a special technique which combines neural networks and sliding modes for solving the robust tracking problem in a nuclear reactor when only the input and the output are available. Due to the appropriate sensor absence, the design is based on a differential neural network observer. The highly nonlinear structure provided by this neural network is linearized using sliding mode. Finally, this linear model is employed for determining a sliding mode control for tracking a reference model. The efficiency of this technique with a guaranteed bound for the averaged tracking error is illustrated by simulation. © Copyright 2007 IFAC.

关键词： Sliding mode control

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