• Title/Summary/Keyword: PI Controller

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New Anti-windup Strategy for PI-type Speed Controller (PI속도제어기에서의 새로운 적분누적 방지기법)

  • Choi Jong-Woo;Lee Sang-Cheol
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.54 no.12
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    • pp.629-637
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    • 2005
  • This paper proposes a new anti-windup strategy to suppress integrator windup for PI speed controller and to be implemented on the existing system with minimal modification. When the speed control mode is changed from P controller to PI controller. an appropriate initial value for integrator is assigned. This value restricts overshoot and high settling time. Also, the proposed method guarantees the designed performance independent on operating conditions, i.e. different set-point change and load torque. Simulation and experimental results for PMSM speed controller have shown its superior performance compared with the conditional integration and tracking back calculation.

PID Controller Tuning using Co-Efficient Diagram method for Indirect Vector Controlled Drive

  • Durgasukumar, G.;Rama Subba Redddy, T.;Pakkiraiah, B.
    • Journal of Electrical Engineering and Technology
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    • v.12 no.5
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    • pp.1821-1834
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    • 2017
  • Medium voltage control applications due to obtain better output voltage and reduced electro-magnetic interference multi level inverter is used. In closed loop control with inverter, the PI controller does not operate satisfactorily when the operating point changes. This paper presents the performance of Co-Efficient diagram PI controller based indirect vector controlled induction motor drive fed from three-level inverter under different operating conditions (dynamic and steady state). The proposed Co-Efficient diagram PI controller based three level inverter significantly reduces the torque ripple compared to that of conventional PI controller. The performance of the indirect vector controlled induction motor drive has been simulated at different operating conditions. For three-level inverter control, a simplified space vector modulation technique is implemented, which reduces the coordinate transformations complications in the algorithms. The performance parameters, torque ripple contents and THD of induction motor drive with three-level inverter is compared under different operating conditions using CDM-PI and conventional PI controllers.

Design of a GA-Based Fuzzy PI Controller for Optical Disk Drive (유전알고리즘을 이용한 Optical Disk Drive의 퍼지 PI 제어기 설계)

  • 유종화;주영훈;박진배
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 2004.04a
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    • pp.413-417
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    • 2004
  • This paper proposes a fuzzy proportional-Integral (PI) controller for the precise tracking control of optical disk systems based on the genetic algorithm (GA). The fuzzy PI control rules are optimized by the GA to yield an optimal fuzzy PI controller. We validate the feasibility of the proposed method through a numerical simulation.

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Stabilizing Water Leveling System Using Modified PI Controller (수정된 PI 제어기를 이용한 수위 제어)

  • Moon, Sungwoong
    • Journal of the Institute of Electronics and Information Engineers
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    • v.54 no.1
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    • pp.131-136
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    • 2017
  • In this study, we design a controller that regulates the water leveling system which suffers from the disturbance. A number of control techniques have been reported which can reduce the amplitude of disturbance. But due to input-delay, these methods do not perform as expected. To overcome the problem, this paper introduces a filter and proposes a proportional and integral (PI) controller that combined with the filter (modifed PI controller). Moreover, we combine the controller with disturbance observer (DOB) that can estimate and eliminate disturbance. The proposed controller and combined the controller with DOB are tested using MATLAB.

Design of a Neural Network PI Controller for F/M of Heavy Water Reactor Actuator Pressure (신경회로망과 PI제어기를 이용한 중수로 핵연료 교체 로봇의 구동압력 제어)

  • Lim, Dae-Yeong;Lee, Chang-Goo;Kim, Young-Baik;Kim, Young-Chul;Chong, Kil-To
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.3
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    • pp.1255-1262
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    • 2012
  • Look into the nuclear power plant of Wolsong currently, it is controlled in order to required operating pressure with PI controller. PI controller has a simple structure and satisfy design requirements to gain setting. However, It is difficult to control without changing the gain from produce changes in parameters such as loss of the valves and the pipes. To solve these problems, the dynamic change of the PI controller gain, or to compensate for the PI controller output is desirable to configure the controller. The aim of this research and development in the parameter variations can be controlled to a stable controller design which is reduced an error and a vibration. Proposed PI/NN control techniques is the PI controller and the neural network controller that combines a parallel and the neural network controller part is compensated output of the controller for changes in the parameters were designed to be robust. To directly evaluate the controller performance can be difficult to test in real processes to reflect the characteristics of the process. Therefore, we develope the simulator model using the real process data and simulation results when compared with the simulated process characteristics that showed changes in the parameters. As a result the PI/NN controller error and was confirmed to reduce vibrations.

The Speed Control of the Switched ReI uctance Motor using Fuzzy PI Controller (퍼지PI 제어기를 사용한 스위치드 리럭턴스 전동기의 속도제어)

  • Ryoo, Hong-Je;Kim, Hack-Seong;Kim, Sei-Chan;Kang, Wook;Won, Chung-Yuen
    • Journal of the Korean Institute of Telematics and Electronics B
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    • v.33B no.2
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    • pp.209-216
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    • 1996
  • This paper deals with the speed control of the switched reluctnace motor using fuzzy PI controller. A fuzzy logic control provides a good approach to nonlinear system because it does not require a detailed mathematical model to formulate the algorithm. The fuzzy PI controller is implemented by MCS80C196KB, a 16 bit one-chip microcontroller, and an EPROM is used for the commutation logic of the SRM. The simulation and experimental results show that the performance of the fuzzy PI controller is superior to that of the conventional PI controller in terms of response time, settling time and overshoot. In particular, the robustness of the system is largely improved.

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The Design of PI controller using a saturation function in frequency domain (포화함수를 이용한 주파수영역에서의 PI제어기설계)

  • Oh, Seung-Rohk
    • Proceedings of the IEEK Conference
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    • 2009.05a
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    • pp.326-328
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    • 2009
  • we an autotuning algorithm for PI controller with unknown plant. The proposed algorithm uses a saturation function and time delay element as a test signal. Since the integral element of PI controller reduces a phase margin and amplitude margin in the closed loop system, the closed loop system could be resulted in unstable with PI controller, To avoid unstable in the closed loop system with PI controller, the proposed algorithm identifies one point information in the 3rd quadrant of Nyquist plot with a time delay element. The proposed method improves an accuracy of one point identified information with one saturation function.

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Design of Advanced Multi-loop PI Controller for Multi-delay Processes (다중 시간지연 공정을 위한 개선된 다중루프 PI 제어기 설계)

  • Vu, Truong Nguyen Luan;Lee, Moon-Yong
    • Journal of Institute of Control, Robotics and Systems
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    • v.16 no.1
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    • pp.77-82
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    • 2010
  • An analytical method for robust design of the multi-loop proportional-integral (PI) controller is proposed for various types of multi-delay processes. On the basis of the direct synthesis and generalized IMC-PID approach, the analytical tuning rules of the multi-loop PI controller are firstly derived for achieving the desired closed-loop response, and the structured singular value synthesis is then utilized for the tradeoffs between the robust stability and performance by adjusting only one design parameter (i.e., the closed-loop time constant). To verify the superiority of the proposed method, the simulation studies have been conducted on a wide variety of multivariable processes. The multi-loop PI controller designed by the proposed method shows a fast, well-balanced and robust response with the minimum integral absolute error (IAE) in compared with other renowned methods.

A Design of Optimal Fuzzy-PI Controller to Improve System Stability of Power System with Static VAR Compensator (SVC를 포함한 전력시스템의 안정도 향상을 위한 최적 퍼지-PI 제어기의 설계)

  • Kim, Hai-Jai;Joo, Seok-Min
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.53 no.3
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    • pp.122-128
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    • 2004
  • This paper presents a control approach for designing a fuzzy-PI controller for a synchronous generator excitation and SVC system. A combination of thyristor-controlled reactors and fixed capacitors(TCR-FC) type SVC is recognized as having the most flexible control and high speed response, which has been widely utilized in power systems, is considered and designed to improve the response of a synchronous generator, as well as controlling the system voltage. A Fuzzy-PI controller for SVC system was proposed in this paper. The PI gain parameters of the proposed Fuzzy-PI controller which is a special type of PI ones are self-tuned by fuzzy inference technique. It is natural that the fuzzy inference technique should be based on humans intuitions and empirical knowledge. Nonetheless, the conventional ones were not so. Therefore, In this paper, the fuzzy inference technique of PI gains using MMGM(Min Max Gravity Method) which is very similar to humans inference procedures, was presented and applied to the SVC system. The system dynamic responses are examined after applying all small disturbance condition.

The optimum gain design of PI Controller using a speed estimation in Sensorless vector-control (센스리스 벡터제어의 속도추정 기에 사용되는 PI제어기의 최적이득 설계)

  • Kim, Hyung-Jun;Cho, Nae-Sue;Ku, Bon-Ho;Youn, Kyung-Sup;Kwon, Woo-Hyen
    • Proceedings of the KIEE Conference
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    • 2004.11c
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    • pp.614-616
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    • 2004
  • It is waste of time in industrial plant that the PI controller gain tuning. The PI controller has many trial-and-error steps for gain design. This paper proposes the optimum gain design of PI controller using a speed estimation in sensorless vector-control. In this method, a degree of stability and Hurwitz theory are applied and the controller gain is expressed by system parameters.

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