• Title/Summary/Keyword: Windup

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Development of Anti-Windup Method for Time Delay Control (시간지연제어의 와인드업 방지를 위한 기법의 개발)

  • 장평훈;박석호;이성욱
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.10
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    • pp.2616-2628
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    • 1994
  • Recently the Time Delay Control(TDC) method has been proposed as a promising technique in the robust control area, where the plant has unknown dynamics with parameter variations and substantial disturbances are present. When TDC is applied to the plant with saturation nonlinearity, however, the so called windup phenomena are observed to arise, causing excessive overshoot and instability. In order to solve this problem, we have proposed an anti-windup method for TDC. The stability of the overall system has been analyzed for a class of LTI MIMO system. The effectiveness for the proposed method has been shown with simulation and experiment results.

Anti-Jump Resonance Characteristics of Anti-Windup Compensator for Systems with a Saturating Actuator (와인드업 방지 보상기의 점프공진 제거 특성)

  • 장원욱;노현석;박영진
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.6
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    • pp.1342-1350
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    • 1993
  • One of the undesirable nonlinear phenomena in feedback control systems is called 'wind up', which is characterized by large overshoot, slow response, and even instability. It is caused by interaction between the integrator in the controller and the saturating actuator. Limit cycle and jump resonance are another nonlinear characteristrics of systems with saturating actuators. Several 'anti-windup' compensators have been developed to prevent some of the aforementioned nonlinear characteristics such as instability and limit cycle, but none has studied the effect of anti-windup compensator on the jump resonance. In this paper, we developed an analytical method to design the compensator to prevent not only limit cycle but also jump resonance. An illustrative example is included to show the compensator eliminates jump resonance effectively.

Anti-windup PI Current Controller Using Steady-State Value of Integral State for Induction Motor (유도전동기를 위한 적분상태의 정상상태 값을 이용한 Anti-windup PI 전류 제어기)

  • Seo, Eun-Sung;Park, Jong-Gyu;Shin, Hwi-Beom
    • Proceedings of the KIPE Conference
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    • 2013.07a
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    • pp.80-81
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    • 2013
  • 유도전동기의 전류 제어 시 PWM(Pulse Width Modulation)이 만들어 낼 수 있는 전압 크기의 제한으로 인해 전류 제어기의 출력과 유도전동기에 입력되는 값이 다를 수 있다. 이로 인해 windup현상이 발생하게 되고, 이는 느린 정착 시간 및 큰 오버슈트와 같은 제어기 성능 저하를 야기 시킬 뿐만 아니라 심각할 경우 시스템의 불안정을 초래한다. 따라서 본 논문에서는 유도전동기의 전류 제어 성능을 개선하기 위해 새로운 anti-windup PI 전류 제어 방법을 제안하고, 실험을 통해 증명한다.

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Anti-windup Integral-Proportional Controller for Variable-Speed Motor Drives

  • Park, Jong-Gyu;Chung, Jae-ho;Shin, Hwi-Beom
    • Journal of Power Electronics
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    • v.2 no.2
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    • pp.130-138
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    • 2002
  • The windup phenomenon appears and degrades control performance when a controller with integrating action is used and plant input is limited. An anti-windup integal-proportional(IP) controller is proposed for the variable-speed moter drives and it is experimentally applied to the speed control of a vector-controlled induction moter driven by a pulse width modulated (PWM) voltage source inverter (VSI). The consistency range of the IP controller is firstly derived and the intergal state is controlled to salisfy always the consistency range according to whether the the controller output is saturated or not. Although the operating condition like moter load or speed command is changed under the limited plant input, It is expermentally verified that the speed response has much improved performance, such as no overshoot and fast settling time, and the maximmum plant input is also effectively utilized.

Anti-Windup PI Current Control with Integral State Predictor for Induction Motor (유도전동기의 적분 상태 예측기를 갖는 Anti-Windup PI 전류제어기)

  • Seo, Eun-sung;Jung, Woong-Do;Li, Xin-lan;Shin, Hwi-Beom
    • Proceedings of the KIPE Conference
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    • 2012.07a
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    • pp.71-72
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    • 2012
  • 비례-적분(PI) 제어기 출력이 포화되었을 때, windup현상이 나타나며 이것은 큰 오버슈트 및 느린 정착 시간과 같은 성능저하를 야기시킨다. 이 논문에서는 이러한 문제점을 개선하기 위해 적분 상태 예측기를 갖는 Anti-windup PI제어기를 이용한 전류제어 방법을 제안한다. PSIM을 이용한 시뮬레이션을 통해 성능을 증명하였다. 이 방법은 PI제어기 출력이 포화되었을 경우와 그렇지 않을 경우에 따라 적분 상태가 각각 제어된다. 실험결과는 PI제어 방법과 비교하여 오버슈트 및 정착 시간과 같은 제어 성능이 개선되었음을 보여준다.

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Performance Improvement of Active Queue Management for Internet Routers

  • Lim, Hyuk;Park, Kyung-Joon;Park, Eun-Chan;Park, Chong-Ho
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.77.1-77
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    • 2001
  • In this paper, we propose a control scheme for improving the performance of a conventional Proportional-Integral (PI) controller for Active Queue Management (AQM) supporting TCP flows. When the PI controller is used for AQM, the windup phenomenon of the integral action causes the performance degradation. Therefore we model AQM as a system with a saturator and apply anti-windup methods to the PI controller for AQM. We compare the performances of anti-windup algorithm with the conventional PI controller through ns simulations. The simulation results show that the PI controller with anti-windup method performs better than the conventional PI controller.

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Anti-Windup Scheme to Control DC Voltage of Three-Phase Four-Wire Active Power Filter (누적방지 기법을 적용한 3상 4선식 능동전력필터 시스템의 직류전압 제어)

  • 정교범
    • The Transactions of the Korean Institute of Power Electronics
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    • v.8 no.2
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    • pp.128-136
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    • 2003
  • This paper investigates the application of the anti-windup scheme to control U voltage of the three-phase four-wire active power filter, installed in a three-phase four-wire power system. In order to reduce efficiently the harmonic currents caused by the switching loads and to improve the whole performance of the flower system, the DC voltage of the three-phase four-wire active power filter should be properly controlled. PI controller can be applied to the U voltage controller of the three-phase four-wire active power filter. However, a large error input to PI controller leads to a windup phenomenon which deteriorate the dynamic characteristics of the U voltage controller Therefore, the application of the anti-windup scheme for the DC voltage controller is proposed and the improved performances of the anti-windup U voltage controller are proved through the computer simulation study.

An Anti-Windup Compensation for Systems with Saturation Actuators (포화 요소가 있는 계를 위한 와인드업 방지 보상 방법)

  • 장원욱;박영진
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.7
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    • pp.1332-1340
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    • 1992
  • A novel approach based on a nonlinear compensator is prposed to prevent 'windup', which is caused by the saturation of the acutator and the integral action of the controller. The anti-windup compensator is located between the conventional linear controller, designed neglecting the saturation, and the actuator. It was proven based on the describing function method that, if the closed loop control systems are stable assuming no saturation, then there may exist a range of compensator gain which prevents any limit-cycle. The computer simulation results show that the compensator proposed in the manuscript can eliminate the limit cycle and improve the transient response.

Improved Conditional Integrator Anti-Windup Method for Seamless Transfer of Bidirectional DC-DC Converter in Grid-Connected Battery Energy Storage System (계통연계형 배터리 에너지저장장치용 양방향 DC-DC 컨버터의 무순단 절체를 위한 조건부 적분 안티-와인드업 연구)

  • Eom, Jun-Yong;Choi, Sung-Jin;Lee, Hong-Hee
    • The Transactions of the Korean Institute of Power Electronics
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    • v.25 no.5
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    • pp.333-342
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    • 2020
  • Power exchanges between the grid and the battery through a bidirectional DC-DC converter are essential for DC microgrid systems. In general, the battery is charged when the grid is connected, and the system is powered by the battery when the grid is disconnected. In this mode transition, the saturation of the voltage controller slows down output response and produces large transient errors in DC link voltage. To solve this problem, a novel anti-windup design is proposed to improve anti-windup performance further. The proposed method stabilizes DC bus voltage through a wider range of battery voltage with faster transition compared with that of conventional methods. The proposed method is verified through an experimental setup composed of a 125 W laboratory-scale DC microgrid system.

New 3-Phase Phase Locked Loop(PLL) Strategy Haying Frequency Limiter and Anti-windup Suitable to Uninterruptible Power Supply (무정전전원장치에 적합한 주파수 제한기와 안티 와인드업을 가지는 새로운 3상 전원각 정보 추출 방식)

  • Ji, Jun-Keun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.7 no.6
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    • pp.1086-1091
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    • 2006
  • In this paper an advanced PLL strategy suitable to UPS, compared with conventional PLL strategy using the positive sequence component extracted from source voltages, is suggested. Frequency limiter and anti-windup are added to conventional PI controller in suggested PLL strategy. Basic operational principle of suggested PLL is same as that of conventional PLL, but the difference between two strategies is that the suggested PLL can limit the change of frequency in constant range because of inclusion of frequency limiter. Compute. simulation was carried fer the DVR(dynamic voltage restorer) compensating voltage to examine the difference between conventional PLL strategy and the suggested PLL strategy limiting frequency. And the results clearly demonstrate the effectiveness of the suggested PLL strategy for UPS.

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