• Title/Summary/Keyword: feedback linearizing controller

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ADAPTIVE PI FUZZY CONTROLLER FOR INDUCTION MOTOR USING FEEDBACK LINEARIZING METHOD

  • Motlagh, Muhammad Reza Jahed;Hajatipour, Majid
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.514-518
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    • 2005
  • In this paper an adaptive fuzzy PI controller with feedback linearizing meth od is implemented to controlling flux and torque separately in induction motor. In this paper first decoupling of torque and flux which are outputs to be controlled, is achieved by using feedback linearization methodology. Then for reducing the effect of noise and rejection of disturbance, main part of controller which is adaptive PI fuzzy controller, is designed. Coefficients of PI controller are determined by defined fuzzy rules due to error dynamic. Inputs of fuzzy system are defined sliding surfaces which consist of torque and flux errors. The main contribution of this paper is effect reduction of noise and disturbance on torque and flux which is based on fuzzy logic and nonlinear control. At last the effectiveness of the proposed control scheme in presence of noise and load disturbance is simulated and comprised to applying sliding method. The results verify better effectiveness of the proposed method for effect reduction of noise and disturbance.

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Controller development for an EMS using nonlinear feedback linearization (비선형 궤환 선형화를 사용한 자기부상 열차의 제어기 개발)

  • 서진헌;진주화
    • 제어로봇시스템학회:학술대회논문집
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    • 1990.10a
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    • pp.669-674
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    • 1990
  • A nonlinear feedback linearizing control method for a EMS(Electro Magnetic Suspension) system is proposed. After linearizing the system using the exact linearizing method, conventional linear system control theory has been applied. Computer simulations are carried out in order to compare the performance of the proposed controller with that of the existing controller designed by using Taylor series expansion around nominal points.

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Decentralized Input-Output Feedback Linearizing Control for a Multi-Machine Power System using Output Modification (수정된 출력을 이용한 다기 전력 계통의 분살 입출력 되먹임 선형화 제어)

  • Jee, Hwang;Yoon, Tae-Woong;Kim, Seok-Kyoon
    • Proceedings of the KIEE Conference
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    • 2006.10c
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    • pp.291-294
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    • 2006
  • This paper presents a decentralized input-output feedback linearizing controller for a multi-machine power system. Firstly, the controller is designed using input-output feedback linearization for modified outputs. Then we present a guideline for selecting gains of the controller and parameters in the modified outputs. Simulations illustrate the effectiveness of the proposed control scheme and the selection guideline.

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Design of the Feedback linearizing Nonlinear Control with Uncertain Parameter. (미지의 파라메터를 가진 비선형 시스템의 궤환 선형화 제어기개발.)

  • Joo, Sung-Jun;Seo, Jin-Heon
    • Proceedings of the KIEE Conference
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    • 1996.07b
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    • pp.1134-1136
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    • 1996
  • A necessary and suficient conditions is proposed for feedback linearizable SISO systems with unknown constant parameters. It is shown that the systems which satisfy the proposed conditions can be transformed into a controllable linear system with unknown parameter and it can be stabilized using the nonlinear feedback linearizing controller. We also present the analysis and implementation of a nonlinear feedback linearizing control for an Electro-Magnetic Suspension (EMS) system. We show that an EMS system is nonlinear feedback linearizable and satisfies the proposed conditions, and hence that the proposed nonlinear feedback controller for an EMS system is robust against mass parameter perturbation and force disturbance.

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Controller Development for a Single-Magnet Suspension System Using Nonlinear Feedback Linearization (비선형궤환 선형화 기법을 사용한 단일 자석 자기부상 시스템의 제어기 개발)

  • 진주화;서진헌;김국헌
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.41 no.3
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    • pp.292-299
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    • 1992
  • A nonlinear feedback linearizing control method for an EMS (Electro-Magnetic Suspension) system is proposed. After linearzing the system using the exact linearizing method, conventional linear system control theory has been applied. Robustness properties of the proposed controller with respect to the load variations is also analysed for a single magnet suspension system. Computer simulation is carried out in order to compare the performance of the proposed controller with that of the existing controller designed by using Taylor series expansion around nominal points.

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Input-Output Feedback Linearizing Controller Design of a Power System Using a Modified Voltage Equation (수정한 전압방정식을 이용한 발전기의 입출력 귀환선형화 제어기 설계)

  • Kim, Seok-Kyoon;Yoon, Tae-Woong
    • Proceedings of the KIEE Conference
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    • 2006.04a
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    • pp.183-185
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    • 2006
  • This paper presents a SISO nonlinear controller for the power system consisting of a synchronous generator connected to an infinite bus. The proposed controller is based on input-output feedback linearization, with a modified version of the terminal voltage equation used as the output. The resulting closed-loop has no internal dynamics, and thus stability is guaranteed. The controller performance is seen to be effective through simulations.

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Robust Nonlinear Control of Air-to-Fuel Ratio in Spark Ignition Engines

  • Myoungho Sunwoo;Paljoo Yoon;Park, Seungbum;Lee, Wootaik
    • Journal of Mechanical Science and Technology
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    • v.15 no.6
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    • pp.699-708
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    • 2001
  • This paper presents a new approach to the AFR (Air-to-Fuel Ratio) control problem, which is based on the wide-band oxygen sensor output. The dedicated nonlinear controller is based on the feedback lineaization technique. It is well known that the feedback linearizing control technique requires an exact model of the plant for the cancellation of plant nonlinearities. A sliding mode control scheme is applied which can effectively compensate the modeling uncertainties. The measurement time delay of an oxygen sensor limits the gain of the feedback controller. Hence, time delay compensation procedure is necessary for the improvement of control performance. The Smith predictor is adopted to compensate the effects of time delay. The simulation and experimental results show that the proposed controllers can effectively reduce the transient peaks of AFR in spite of fast tip-in and tip-out maneuvers of the throttle.

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Design of the High Gain Nonlinear Feedback Linearizing Control. (고이득 제어를 이용한 비선형 궤환 선형화 제어기개발.)

  • Lee, Ju-Suk;Joo, Sung-Jun;Seo, Jin-Heon
    • Proceedings of the KIEE Conference
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    • 1996.07b
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    • pp.930-932
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    • 1996
  • Some results and a nonlinear controller are proposed for feedback linearizable SISO systems with unknown constant parameters. It is shown that the systems which satisfy the proposed conditions can be transformed into a controllable linear subsystem with unknown parameter and it can be stabilized using the high gain nonlinear feedback linearizing controller. As an example for the proposed theorem, we introduce the single link robot with joint flexibility which is an well known example.

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Adaptive Fuzzy Sliding Mode Controller for Nonaffine Nonlinear Systems

  • Park, Jang-Hyun;Kim, Dong-Won;Huh, Sung-Hoe;Park, Gwi-Tae
    • 제어로봇시스템학회:학술대회논문집
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    • 2002.10a
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    • pp.62.6-62
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    • 2002
  • $\textbullet$ Introduction $\textbullet$ Problem Formulation $\textbullet$ Feedback Linearizing Controller Design $\textbullet$ Fuzzy System to Cancel System Uncertainty $\textbullet$ Adatptive Fuzzy Sliding Mode Controller Design $\textbullet$ Simulations $\textbullet$ Conclusions

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A Dynamic Anti-windup Scheme for Input-constrained Feedback Linearizable Nonlinear Systems (궤환선형화 가능한 비선형 시스템의 입력제한을 고려한 동적 와인드엎 방지)

  • 윤성식;박종구;윤태웅
    • 제어로봇시스템학회:학술대회논문집
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    • 2000.10a
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    • pp.534-534
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    • 2000
  • This paper proposes a dynamic compensation scheme for input-constrained feedback linearizable nonlinear systems to cope with the windup phenomenon. Given a feedback linearizing controller for such a nonlinear system designed without considering its input constraint, an additional dynamic compensator is proposed to account for the constraint. This dynamic anti-windup is based on the minimization of a reasonable performance index, and some stability properties of the resulting closed-loop are presented.

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