• Title, Summary, Keyword: PID controller

Search Result 1,658, Processing Time 0.055 seconds

A FUZZY PID Control of Supply Duct Outlet Air Temperature for PEM (FUZZY PID 방법을 이용한 개별 공조시스템의 급기온도 제어)

  • 장영준;박영철;정광섭;한화택;이정재
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.14 no.4
    • /
    • pp.278-284
    • /
    • 2002
  • The work presented here provides a control of the supply duct outlet air temperature in PEM (personal environment module) using fuzzy PID controller. In previous work, PID control systems were used, but the result shows that the outlet air temperature and electric heater regulating voltage were oscillated. Fuzzy PID control systems are designed to improve the system response obtained using PID control and implemented experimentally Also, PID controller and fuzzy controller without PID logic are provided to compare the result with that of the fuzzy PID controller. Data obtained shows that the fuzzy PID control system satisfies the design criteria and works proper1y in controlling the supply air temperature. Also it has bettor performance than the previous result obtained using PID control.

Performance Improvement of the Nonlinear Fuzzy PID Controller

  • Kim, Jong Hwa;Lim, Jae Kwon;Joo, Ha Na
    • Journal of the Korean Society of Marine Engineering
    • /
    • v.36 no.7
    • /
    • pp.927-934
    • /
    • 2012
  • This paper suggests a new fuzzy PID controller with variable parameters which improves the shortage of the fuzzy PID controller with fixed parameters suggested in [9]. The derivation procedure follows the general design procedure of the fuzzy logic controller, while the resultant control law is the form of the conventional PID controller. Therefore, the suggested controller has two advantages. One is that it has only four fuzzy linguistic rules and analytical form of control laws so that the real-time control system can be implemented based on low-price microprocessors. The other is that the PID control action can always be achieved with time-varying PID controller gains only by adjusting the input and output scalers at each sampling time.

A Study on the Dynamic Positioning Control Algorithm Using Fuzzy Gain Scheduling PID Control Theory (퍼지게인 스케쥴링 PID 제어이론을 이용한 동적 위치 유지 제어기법에 관한 연구)

  • Jeon, Ma-Ro;Kim, Hee-Su;Kim, Jae-Hak;Kim, Su-Jeong;Song, Soon-Seok;Kim, Sang-Hyun
    • Journal of the Society of Naval Architects of Korea
    • /
    • v.54 no.2
    • /
    • pp.102-112
    • /
    • 2017
  • Many studies on dynamic positioning control algorithms using fixed feedback gains have been carried out to improve station keeping performance of dynamically positioned vessels. However, the control algorithms have disadvantages in that it can not cope with changes in environmental disturbances and response characteristics of vessels motion in real time. In this paper, the Fuzzy Gain Scheduling - PID(FGS - PID) control algorithm that can tune PID gains in real time was proposed. The FGS - PID controller that consists of fuzzy system and a PID controller uses weighted values of PID gains from fuzzy system and fixed PID gains from Ziegler - Nichols method to tune final PID gains in real time. Firstly, FGS - PID controller, control allocation algorithm, FPSO and environmental disturbances were modeled using Matlab/Simulink to evaluate station keeping performance of the proposed control algorithm. In addition, simulations that keep positions and a heading angle of vessel with wind, wave, current disturbances were carried out. From simulation results, the FGS - PID controller was confirmed to have better performances of keeping positions and a heading angle and consuming power than those of the PID controller. As a consequence, the proposed FGS - PID controller in this paper was validated to have more effectiveness to keep position and heading angle than that of PID controller.

On-Line Fuzzy Auto Tuning for PID Controller (PID 제어기의 On-Line 퍼지 자동동조)

  • Hwang, Hyeong-Su;Choe, Jeong-Nae;Lee, Won-Hyeok
    • The Transactions of the Korean Institute of Electrical Engineers D
    • /
    • v.49 no.2
    • /
    • pp.55-61
    • /
    • 2000
  • In this paper, we proposed a new PID tuning algorithm by the fuzzy set theory to improve the performance of the PID controller. The new tuning algorithm for the PID controller has the initial value of parameter Kc, $\tau$I, $\tau$D by the Ziegler-Nichols formula using the ultimate gain and ultimate period from a relay tuning experiment. We get error and error change of plant output correspond to the initial value and new proportion gain(Kc) and integral time($\tau$I) from fuzzy tunner. This fuzzy tuning algorithm for PID controller considerably reduced overshoot and rise time compare to any other PID controller tuning algorithms. In real parametric uncertainty systems, the PID controller with Fuzzy auto-tuning give appreciable improvement in the performance. The significant properties of this algorithm is shown by simulation In this paper, we proposed a new PID algorithm by the fuzzy set theory to improve the performance of the PID controller.

  • PDF

Design of Fuzzy Precompensated PID Controller for Load Frequency Control of Power System using Genetic Algorithm (유전 알고리즘을 이용한 전력계통의 부하주파수 제어를 위한 퍼지 전 보상 PID 제어기 설계)

  • Jeong, Hyeong-Hwan;Wang, Yong-Pil;Lee, Jeong-Pil;Jeong, Mun-Gyu
    • The Transactions of the Korean Institute of Electrical Engineers A
    • /
    • v.49 no.2
    • /
    • pp.62-69
    • /
    • 2000
  • In this paper, we design a GA-fuzzy precompensated PID controller for the load frequency control of two-area interconnected power system. Here, a fuzzy precompensated PID controller is designed as a fuzzy logic-based precompensation approach for PID controller. This scheme is easily implemented simply by adding a fuzzy precompensator to an existing PID controller. And we optimize the fuzzy precompensator with a genetic algorithm for complements the demerit such as the difficulty of the component selection of fuzzy controller, namely, scaling factor, membership function and control rules. Simulation results show that the proposed control technique is superior to a conventional PID control and a fuzzy precompensated PID control in dynamic responses about the load disturbances of power system and is convinced robustness reliableness in view of structure.

  • PDF

Fuzzy Scheduling for the PID Gain Tuning (PID 이득 동조를 위한 퍼지 스케줄링)

  • Shin Wee-Jae
    • Journal of Korean Institute of Intelligent Systems
    • /
    • v.15 no.1
    • /
    • pp.120-125
    • /
    • 2005
  • In this paper, We propose the fuzzy controller for the gain tuning of PID controller The proposed controller doesn't use the crisp output error and rule tables though with a fuzzy inference process in forward fuzzifier, New Fuzzy PID Controller assigns relations and ranges of two variables of PID gain parameters. These new gain parameters are calculated by the fuzzy inference with max-min ranges of Kp and Kd. The Ki parameter is computed automatically between Kp and Kd parameter Is calculated by Ziegler-Nickels tuning rules. Finally we experimented the propose controller by the hydraulic servo motor control system. We can obtained desired results through the good control characteristics.

A comparison of PID control with intelligent control for continuous casting (연주 몰드레벨제어에 있어서 PID제어와 지능제어기법의 비교)

  • 김주만;이진수;이덕만
    • 제어로봇시스템학회:학술대회논문집
    • /
    • /
    • pp.1064-1067
    • /
    • 1996
  • This paper describes the design and implementation of an intelligent controller for continuous casting process. The proposed controller adopted a fuzzy control with feedback linearization. The simulation result shows that proposed intelligent controller is superior to the conventional PID controller.

  • PDF

PID Control with Fuzzy Compensation for Electric Power Generation Unit (보상형 퍼지알고리즘을 이용한 전력발전기의 PID 제어)

  • Hak Roh, Lee
    • Proceedings of the Korean Institute of Intelligent Systems Conference
    • /
    • /
    • pp.217-220
    • /
    • 2004
  • Controller that is designed in this paper is form that apply PID controller about Fuzzy algorithm. Fuzzy Controller that using this paper is can speak that compensation style fuzzy controller as form to solidify action of PID controller for plant. This is not form that autotuning the each PID coefficient. We Apply and examined the response character to AGC(Automatic Generation Control) system using designed controller.

  • PDF

Electromagnetic Strip Stabilization Control in a Continuous Galvanizing Line using Mixture of Gaussian Model Tuned Fractional PID Controller (비정수 차수를 갖는 비례적분미분제어법과 가우시안 혼합모델을 이용한 연속아연도금라인에서의 전자기 제진제어 기술)

  • Koo, Bae-Young;Won, Sang-Chul
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.21 no.8
    • /
    • pp.718-722
    • /
    • 2015
  • This paper proposes a fractional-order PID (Proportional-Integral-Derivative) control used electromagnetic strip stabilization controller in a continuous galvanizing line. Compared to a conventional PID controller, a fractional-order PID controller has integration-fractional-order and derivation-fractional-order as additional control parameters. Thanks to increased control parameters, more precise controller adjustment is available. In addition, accurate transfer function of a real system generally has a fractional-order form. Therefore, it is more adequate to use a fractional-order PID controller than a conventional PID controller for a real world system. Finite element models of a $1200{\times}2000{\times}0.8mm$ strip, which were extracted using a commercial software ANSYS were used as simulation plants, and Gaussian mixture models were used to find optimized control parameters that can reduce the strip vibrations to the lowest amplitude. Simulation results show that a fractional-order PID controller significantly reduces strip vibration and transient response time than a conventional PID controller.

Position Control of Servo Motor using Hybrid Controller (하이브리드 제어기를 이용한 서보 전동기의 위치제어)

  • Kwon, Se-Hyun
    • Journal of the Institute of Convergence Signal Processing
    • /
    • v.10 no.3
    • /
    • pp.186-192
    • /
    • 2009
  • PID controllers are simple in structure and easy for implementation. However, they may produce large overshoots and over-oscillatory responses. Combining PID control with other control techniques often results in advanced hybrid schemes that are able to improve pure PID controllers. This paper proposes hybrid controller for position control system of servo motor. The proposed controller is composed of a subcontroller and a parallel PID controller. The subcontroller improves the transient system performance while the PID controller is mainly responsible for the steady-state system performance. A very promising advantage of this hybrid scheme, in terms of controller synthesis, is that the subcontrollers and controller components can be designed separately. Systematic design methods for various controller components are developed. The proposed hybrid scheme is applied to a DC motor position servo system. The effectiveness of the proposed controller is verified through the computer simulation results.

  • PDF