• Title/Summary/Keyword: variable speed controller

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Power Regulation of Variable Speed Wind Turbines using Pitch Control based on Disturbance Observer

  • Joo, Young-Jun;Back, Ju-Hoon
    • Journal of Electrical Engineering and Technology
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    • v.7 no.2
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    • pp.273-280
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    • 2012
  • Most variable speed wind turbines have pitch control mechanisms and one of their objectives is to protect turbines when the wind speed is too high. By adjusting pitch angles of wind turbine, the inlet power and the torque developed by the turbine are regulated. In this paper, the difference between the real wind speed and its rated value is regarded as a disturbance, and a component called disturbance observer (DOB) is added to the pre-designed control loop. The additional DOB based controller estimates the disturbance and generates a compensating signal to suppress the effect of disturbance on the system. As a result, the stability and the performance of the closed loop system guaranteed by an outer-loop controller (designed for a nominal system without taking into account of disturbances) are approximately recovered in the steady state. Simulation results are presented to verify the performance of the proposed control scheme.

ANN Sensorless Control of Induction Motor with AFLC Controller (AFLC 제어기에 의한 유도전동기의 ANN 센서리스 제어)

  • Choi, Jung-Sik;Ko, Jae-Sub;Chung, Dong-Hwa
    • The Transactions of the Korean Institute of Power Electronics
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    • v.11 no.3
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    • pp.224-232
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    • 2006
  • The paper proposes the artificial neural network(ANN) sensorless control of induction motor drive with adaptive fuzzy logic controller(AFLC). Also, this paper proposes the speed control of induction motor using AFC and estimation of speed using ANN controller. The back propagation neural network technique is used to provide a real time adaptive estimation of the motor speed. The error between the desired state variable and the actual one is back-propagated to adjust the rotor speed, so that the actual state variable will coincide with the desired one. The proposed control algorithm is applied to induction motor drive system controlled AFLC and him controller. And this paper is proposed the results to verify the effectiveness of the AFLC and ANN controller.

Implementation of Self-Tuning Fuzzy Control System for Robust Speed Control of an Induction Motor (유도 전동기의 견실한 속도 제어를 위한 자기 조정 퍼지 제어 시스템의 구현)

  • 송호신;이오결;이준탁;우정인
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.43 no.2
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    • pp.346-349
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    • 1994
  • In this paper, we implemented the variable spped controller of an induction motor using the self-tuning fuzzy control algorithms, which recently is invoking the remarkable interest. Also we preposed a self-tuning technique of scale factors which could easily design the fuzzy speed controller. Comparing with conventional PI speed controller, the performances of proposed fuzzy controller such as dynamic responses and its the robustness against load disturbance were substantially improved.

Development of a Controller for Variable-rate Application of Granular Fertilizer (입제 비료의 변량 살포를 위한 제어기 개발)

  • Yu J.H.;Kim Y.J.;Ryu K.H.
    • Journal of Biosystems Engineering
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    • v.31 no.2 s.115
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    • pp.108-114
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    • 2006
  • This study was conducted to design and fabricate a controller for variable-rate application of granular fertilizer based on physical and chemical information, to analyze the performance of the controller and characteristics of a discharger. The result of the study are summarized as follows: 1. The charge ratios of discharger by accumulation heights of fertilizer in hopper were examined, and the variations in charge ratio were $72.58{\sim}93.33%$ and $63.14{\sim}94.42%$ for the fertilizers Super 21 and Sinsedae, respectively. The charge ratio also decreased as the rotational speed of discharger increased. 2. The coefficient of variation of discharge amount by rotational speed and discharge time of discharger were in the range of $2.94{\sim}11.23%$ and $2.82{\sim}10.80%$ for the fertilizer of Super 21 and Sinsedae. Except the rotational speed of 12 rpm, the coefficient of variation for discharge amount were relatively small with 4% more or less 3. In order to evaluate the rotational speed of discharger, the control signal in the range of $0{\sim}5V$ was subdivided into the 50 steps by 0.1V. The regression equation for the rotational speed of discharger was Y=55.984X-79.174(X: input voltage, V, Y: discharger speed, RPM) and the $R^2$ was 0.99. 4. In order to evaluate the performance of the controller for variable-rate application of granular fertilizer, settling time to unit step input was examined. The settling time varied from 0.8sec to 1.4 sec.

A Study On The New Intermittent Message Acquisition Board Using FPGA For Next-Generation High-Speed Rail (차세대 고속철도 증속 운전에 대응하는 불연속 정보 수신보드 개발에 관한 연구)

  • Han, Jae-Mun;Um, Jung-Kyu;Yang, Chan-Seok;Cho, Yong-Gee
    • Proceedings of the KSR Conference
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    • 2009.05b
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    • pp.351-355
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    • 2009
  • There are two types of controller between railway and train. those are the Continuous Message Controller and the Intermittent Message Controller using for KHSR. The conventional Intermittent Message Controller board used a variable resister for setting the phase, but the variable resister affected some environmental facts, such as temperature, humidity, and vibration, etc. And It is requirement of reduction message processing time for speed-up operation in Next-Generation High-Speed Rail. This study suggests how to solve the problem described above. Using FPGA is quite profitable. It's easy to use and maintain, flexible with the New algorithm to fix up the problem.

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Robust Path Tracking Control for Autonomous Underwater Vehicle with Variable Speed (변속 무인 수중 잠수정을 위한 강인 경로 추적 제어)

  • Choi, Yoon-Ho;Kim, Kyoung-Joo
    • Journal of the Korean Institute of Intelligent Systems
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    • v.20 no.4
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    • pp.476-482
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    • 2010
  • In this paper, we propose a robust path tracking control method for autonomous underwater vehicle with variable speed. The proposed path tracking controller consists of a kinematic controller and a dynamic controller. First, the kinematic controller computes the surge speed and yaw rate to follow the reference path with variable speed. Then the dynamic controller controls the thrust force and yaw torque to move the AUV actually. In the dynamic control, we assume that the sway speed is a disturbance. In addition the dynamic controller is designed based on sliding mode conrol. We also demonstrate the stability of the proposed control method by Lyapunov stability theory. Finally, simulation results illustrate the performance of the proposed control method.

A Study on Improvement of Automatic Vehicle´s Comfortability using Fuzzy Controller

  • Il, Bae-Jong;Park, H.S.;Park, Yeon-Wook;Yeun, Hwnag-Yeong;Ha M.K.
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.128.4-128
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    • 2001
  • Based on fuzzy logic algorithm this paper constructed fuzzy logic controller for automated vehicles. For passenger´s convenience especially comfortability controller need to reduce the frequency of input variable´s changing. So we established membership functions for comfortability as well as speed following. It made possible to control comfortability directly. To demonstration the efficiency of fuzzy logic controller, we carried out simulation with a automobile´s transfer function. First, we designed the PID controller by using Ziegler-Nichols tunning method. Second, we calculated time response for each controller, then we compared the speed patterns of fuzzy controlled system and PID controlled system. Also we compared the difference of input variable ...

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Design of Nonlinear PID Controller Based on Immune Feedback Mechanism (면역 피드백 메카니즘에 기초한 비선형 PID 제어기 설계)

  • Park Jin-Hyun;Choi Young-Kiu
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.52 no.3
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    • pp.134-141
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    • 2003
  • PID controllers with constant gains have been widely used in various control systems due to its powerful performance and easy implementation. But it is difficult to have uniformly good control performance in all operating conditions. In this paper, we propose a nonlinear variable PR controller with immune feedback mechanism. An immune feedback mechanism is based on the functioning of biological T-cells, they include both an active term, which controls response speed. and an inhibitive term, which controls stabilization effect. Therefore, the proposed nonlinear PID controller is based on immune responses of biological. immune feedback mechanism which is the cell mediated immunity and In order to choose the optimal nonlinear PID controller games, we also propose the tuning algorithm of nonlinear function parameter in immune feedback mechanism. To verify performance of the proposed algorithm, the speed control of nonlinear DC motor are performed. Front the simulation results, we have found that the proposed algorithm is more superior to the conventional constant fain PID controller.

Hybrid Intelligent Control for Speed Sensorless of SPMSM Drive (SPMSM 드라이브의 속도 센서리스를 위한 하이브리드 지능제어)

  • Lee Jung-Chul;Lee Hong-Gyun;Chung Dong-Hwa
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.53 no.10
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    • pp.690-696
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    • 2004
  • This paper is proposed a hybrid intelligent controller based on the vector controlled surface permanent magnet synchronous motor(SPMSM) drive system. The hybrid combination of neural network and fuzzy control will produce a powerful representation flexibility and numerical processing capability. Also, this paper is proposed speed control of SPMSM using neural network-fuzzy(NNF) control and speed estimation using artificial neural network(ANN) Controller. The back propagation neural network technique is used to provide a real time adaptive estimation of the motor speed. The error between the desired state variable and the actual one is back-propagated to adjust the rotor speed, so that the actual state variable will coincide with the desired one. The back propagation mechanism is easy to derive and the estimated speed tracks precisely the actual motor speed. This paper is proposed the theoretical analysis as well as the simulation results to verify the effectiveness of the new method.

Position synchronizing control of two axes system using by VSS and $H_{\infty}$ control (VSS 및 $H_{\infty}$ 제어법에 의한 2축 위치 동기 제어)

  • 변정환;김영복;양주호
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10b
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    • pp.754-758
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    • 1996
  • In this paper, a new method of position synchronizing control is proposed for multi-axes driving system. The proposed synchronizing control system is constituted with speed and synchronizing controller. The structure of synchronizing control system is varied by sign of synchronizing error. When a disturbance input becomes added to one axis, this axis becomes slave axis. The other axis is master axis. Therefore, master axis is not influenced by the disturbance. The speed controller of the first axis is designed by $H_{\infty}$ control theory. The speed controller of the second axis is designed by inverse dynamics of speed control system of the first axis. The speed control system designed with $H_{\infty}$ controller guarantees low sensitivity for the disturbance as well as robustness against model uncertainties. Especially, the synchronizing controller is designed to keep position error to minimize by controlling speed of slave axis. The effectiveness of the proposed method is successfully confirmed through several experiments.

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