• Title/Summary/Keyword: Observer variation

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Sliding Mode Control of the ABS with a Disturbance Observer (관측기를 가진 ABS 슬라이딩 모드 제어법)

  • Hwang Jin-Kwon;Oh Kyeung-Heub;Song Chul-Ki
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.523-530
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    • 2005
  • This paper addresses sliding mode control (SMC) of the anti-lock braking system (ABS) with a compensator of model uncertainties such as vehicle parameter variation, unmodeled dynamics, and external disturbances. A sliding mode controller (SMC) is designed with a nominal vehicle model to achieve a desired wheel slip ratio. A disturbance observer (DOB) is introduced to compensate the model uncertainties and is designed with a transfer function of a hydraulic brake dynamics. Through simulations on the model uncertainties, it is verified that the sliding mode control with the DOB can give the simulation results better than the sliding mode control without the DOB.

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A Study On Predictive State Observer For Robust Control Of DC Servo Motor (직류 서어보 전동기의 강인성 제어를 위한 예상 상태 업저어버에 관한 연구)

  • Yoon, Byung-Do;Choi, Soon-Young
    • Proceedings of the KIEE Conference
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    • 1988.11a
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    • pp.426-429
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    • 1988
  • A Microprocessor Based Digital Control System is inherently contained a control lag for processing the control program and a data detection time lag. This two types of time lag may cause the system to become unstable. In this paper proposed predictive state observer is used to solve the two time lag problems. I-P control algorithm is used to attain deadbeat response by adjusting the observer gain to overcome the parameter variation or with disturbance. The speed response shows good performance through computer simulation.

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Sensorless Position Control of a PM Linear Synchronous Motor by Sliding Mode (슬라이딩모드 관측기를 이용한 영구자석 선형 동기전동기의 센서리스 위치제어)

  • Son, Young-Dae;No, Dong-Hun;Cho, Sung-Ho;Kim, Gyu-Tak
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.1154-1156
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    • 2001
  • This paper presents the implementation of a positon sensorless vector control system of a PM linear synchronous motor by sliding mode observer based on TMS320F240 DSP controller. Sliding mode observer estimates the secondary velocity and position based on the measurement of current, and it shows very robust characteristic to parameter variation. Therefore, it improves the system performance deterioration caused by system parameter variations. Simulation and experimental considerations are presented to confirm the applicability of sliding mode observer to the sensorless position control of PMLSM.

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Robust Speed Control of AC Permanent Magnet Synchronous Motor using RBF Neural Network (RBF 신경회로망을 이용한 교류 동기 모터의 강인 속도 제어)

  • 김은태;이성열
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.40 no.4
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    • pp.243-250
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    • 2003
  • In this paper, the speed controller of permanent-magnet synchronous motor (PMSM) using the RBF neural (NN) disturbance observer is proposed. The suggested controller is designed using the input-output feedback linearization technique for the nominal model of PMSM and incorporates the RBF NN disturbance observer to compensate for the system uncertainties. Because the RBF NN disturbance observer which estimates the variation of a system parameter and a load torque is employed, the proposed algorithm is robust against the uncertainties of the system. Finally, the computer simulation is carried out to verify the effectiveness of the proposed method.

Modelling of High-Speed Pantograph and Controller Design Using Disturbance Observer (고속 팬터그래프의 새로운 동적 모형 및 외란관측기를 이용한 제어기 설계)

  • Jo, Nam-Hoon;Lee, Kang-Hyun
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.12
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    • pp.2233-2239
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    • 2007
  • The pantograph-catenary system is one of important components for high-speed rail system that are powered electrically. Electrical power is delivered from a catenary structure to the train via a pantograph and thus it is very important to regulate the contact force between catenary and pantograph. Although a lot of research results for active pantograph have been reported, most of them have made an unrealistic assumption that the catenary displacement is constant with respect to the time. In this paper, we present a new pantograph model that regards the catenary displacement as an unknown disturbance input. Moreover, a disturbance observer based controller is proposed to remove the effect of disturbance, i.e., the catenary displacement variation. The computer simulation result shows that the substantial improvement in regulating the contact force can be achieved by the proposed controller.

Robust Adaptive Control for Efficiency Optimization of Induction Motors (유도전동기의 효율 최적화를 위한 강인 적응제어)

  • Hwang, Young-Ho;Park, Ki-Kwang;Kim, Hong-Pil;Han, Hong-Seok;Yang, Hai-Won
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.1505-1506
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    • 2008
  • In this paper, a robust adaptive backstepping control is developed for efficiency optimization of induction motors with uncertainties. The proposed control scheme consists of efficiency flux control(EFC) using a sliding mode adaptive flux observer and robust speed control(RSC) using a function approximation for mechanical uncertainties. In EFC, it is important to find the flux reference to minimize power losses of induction motors. Therefore, we proposed the optimal flux reference using the electrical power loss function. The sliding mode flux observer is designed to estimate rotor fluxes and variation of inverse rotor time constant. In RSC, the unknown function approximation technique employs nonlinear disturbance observer(NDO) using fuzzy neural networks(FNNs). The proposed controller guarantees both speed tracking and flux tracking. Simulation results are presented to illustrate the effectiveness of the approaches proposed.

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Inertia Identification of Electric Machine Using Extended Luenberger Observer at Low Speed Region (확장 루엔버거 관측기를 이용한 저속영역에서의 전동기 관성 추정)

  • Lee Kyo-Beum;Kang Ho-Jin;Song Joong-Ho;Choy Ick;Yoo Ji-Yoon
    • Proceedings of the KIPE Conference
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    • 2002.07a
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    • pp.142-145
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    • 2002
  • A new scheme to estimate machine inertia in low speed is proposed in this paper. It is necessary to consider the machine parameter of low speed instantaneous observer to precise control in servo system, which has frequent load variation and speed change. To estimate machine parameter, especially the moment of inertia, Reduced-Order Extended Luenberger Observer (ROELO) is applied. The effectiveness of the proposed ROELO is showed by simulation.

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Extension of the Operating Speed for Vector-Controlled Induction Machine Drives in the Overmodulation Range

  • Nguyen, Thanh Hai;Lee, Dong-Choon
    • Journal of Power Electronics
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    • v.12 no.3
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    • pp.477-486
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    • 2012
  • This paper proposes a novel current control scheme for vector-controlled induction machine (IM) drives in the overmodulation (OVM) range, with which the voltage utilization of the voltage-source inverter (VSI) can be maximized. In the OVM region, the original voltage reference is modified by changing its magnitude and angle, which causes the motor current to be distorted, resulting in a deterioration of the current control performance. To meet with this situation, the harmonic components in the feedback currents should be eliminated before being input to the PI current controllers. For this, a composite observer is applied to extract the fundamental and harmonic components from the distorted currents, which gives a good performance without a delay and the effect of a fundamental frequency variation. In addition, through a detailed analysis of the response of the PI current controllers in the OVM range, the effectiveness of using the composite observer is demonstrated. Simulation and experimental results for a 3-kW induction motor drive are shown to verify the validity of the proposed method.

A Comparison between Observer and Kalman Filter for Sensorless Induction Motor Drive (센서리스 유도전동기의 관측기 및 칼만필터 방식의 상호 비교)

  • Lee, B.C.;Kim, S.K.;Shin, Y.J.;Kwon, Y.A.
    • Proceedings of the KIEE Conference
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    • 2002.04a
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    • pp.167-169
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    • 2002
  • A sensorless drive has serveral advantages; low cost and mechanical simplicity. This paper studies a comparison between observer and Kalman filter for sensorless speed control of induction motor. The simulation result generally shows good performances in the both sensoless control strategies. In case of considering noises, EKF algorithm shows a better performance. In case of considering parameter variation, observer algorithm shows a better performance.

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Nonlinear Feedback Linearization-Full Order Observer/Sliding Mode Controller Design for Improving Transient Stability in a Power System

  • Lee, Sang-Seung;Park, Jong-Keun
    • Journal of Electrical Engineering and information Science
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    • v.3 no.2
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    • pp.184-192
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    • 1998
  • In this paper, we present a nonlinear feedback linearization-full order observer/sliding mode controller (NFL-FOO/SMC), to obtain smmoth control as a linearized controller in a linear system (or to cancel the nonlinearity in a nonlinear system), and to solve the problem of the unmeasurable state variables as in the conventional SMC. The proposed controller is obtained by combining the nonlinear feedback linearization-sliding mode control (NFL-SMC) with the full order observer (FOO)and eliminates the need to measure all the state variables in the traditional SMC. The proposed controller is applied to the nonlinear power system stabilizer (PSS) for damping oscillations in a power system. The effectiveness of the proposed controller is verified by the nonlinear time-domain simulations in case of a 3-cycle line-to-ground fault and in case of the parameter variation for the AVR gain K\ulcorner and for the inertia moment M.

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