• ICROS
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• v.2 no.1
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• pp.72-84
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• 1996

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1673-1674
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• 2008

화력발전소 보일러의 각종 공정은 대부분 비례 적분 미분 제어기에 의해 제어되어 왔다. 이러한 비례 미분 적분 제어기의 최적튜닝은 공정에 있어 가장 중요한 부분 중 하나라고 할 수 있다. 또한 보일러 제어는 다중의 입력과 루프로 구성되어져 있어 이를 튜닝하기가 어려워 현재까지의 최적튜닝은 튜닝전문가의 숙련도에 의해 결정되어져 왔다. 본 논문에서는 고급공정제어기(Advanced Process Control, APC)를 개발하는 과정과 이를 이용해 최종적으로 보일러 제어기에서 제어하고자 하는 대상에 대한 응답특성을 간단한 튜닝을 통해 구현하는 과정에 대하여 설명하고 그 결과를 시뮬레이터를 통해 시험함으로써 검증해 보이고자 한다.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.3
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• pp.503-510
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• 2021

This study intends to apply the mathematical method of fractional order differentiation to a controller that controls the response of the system. Therefore, we design integrator for the fractional index by converting it into discrete time to construct a controller. The IP controller composes an integral controller for errors and the proportional controller applies only the system output. The controller is designed by using the fractional order integrator to the integral controller of the IP controller. First, the performance of the PI controller and the IP controller is compared, and the designed controller is applied to the speed control of the motor. As a result, the motor output speed was uniformed and precise control performance could be obtained. It was confirmed that the speed error in the steady state is within 0.1 [%], and it has precise and uniform speed control performance without overshoot.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.5
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• pp.1228-1234
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• 2015

In this paper, a fuzzy controller using thermoelectric for temperature environmental tester is developed. The new structure of fuzzy controller based temperature environmental tester is proposed and implemented to maintain a stable temperature and improve temperature change speed. In order to evaluate the efficiency, an experiment is setup to compare PID controller with our proposed controller. The experimental results, we proved that our proposed fuzzy controller has better performance than PID controller.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 1999.05a
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• pp.348-354
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• 1999

In recent years, a PID controller has been used as a major control method in real control processes. This controller requires a determination of PID control gains. But it is difficult to select the best gains theoretically. Thus there have been many approaches to determine them empirically Most of them are based on experience and knowledge. In this paper, we proposed a tuning method of the PID Parameters by using neural network. To show effectiveness of the proposed method, the simulation of DC motor and one link manipulator position control is carried out.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.4 no.3
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• pp.689-696
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• 2000

In this paper, an improved method is proposed to eliminate the chattering for Sliding Mode Controller. The differential-calculus of a switching function is converged to a particular constant or the proportional term so that the chattering in transient state is eliminated in the conventional method. However, by using the improved method, it is converged to its proportional-integral term so that the chattering is eliminated in transient state and steady state both. The computer simulation for brushless DC motor speed controller is used to compare the improved method with the conventional method and to verify the useful effect of the method in this paper.

• Transactions of the Korean Society of Mechanical Engineers
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• v.13 no.6
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• pp.1339-1345
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• 1989

본 연구에서는 앞에서 개발된 온도 제어 시스템을 더욱 소형 경량화하기 위해 서 일반 마이크로 컴퓨터 대신에 원보드 마이컴(one-board micom)을 사용하였다. 원보드 마이컴은 프로그램을 기계어로 작성해야하는 어려움이 있으나 가격이 저렴하고 주변장치가 필요없으며, 크기가 작아 제어시스템을 소형경량화 시킬수 있는 장점이 있다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.12
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• pp.41-47
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• 2009

In this paper, authors performed improvement of control characteristics of an attraction type magnetic levitation system. The attraction type magnetic levitation system has an inherent instability in the system, therefore its controller must have not only proportional-integral gain but also differential gain additionally. In this paper, authors were proposed control algorithm using disturbance observer(DOB) on feedback signal. The computer simulation and experiments were performed for its verification.

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2001.05a
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• pp.225-230
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• 2001

In this paper, a method for optimal design of PID controller using the immune algorithm(IA) has been proposed to improve the stability of A.C.-D.C. power system. The process of this study is composed of formulation of basic controls on HVDC transmission system, mathematical model preparation for stability analysis, and supplementary signal control by an optimal PID controller using the IA. The dynamic property was verified through computer simulations regarding transient stability.

• Journal of Drive and Control
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• v.9 no.4
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• pp.58-61
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• 2012

The customers who used the hydroulic system desire the product that has more detailed specification quickly during the industrial technology is developed. Every researcher try to reduce the developed period and to satisfy the customers' desire. Lot's of simulation software and hardware already was used to be satisfied those purpose. But these kind of equipment need a lot of cost to set up and technical knowledge to drive that system. This paper concerns about analog PID controller that can be assembled with a few resistor, condenser and optional amplifier and doesn't need technical knowledge to drive. At the first, the plant was modeled mathematically to design the analog PID controller's circuit. After that, PID controller's parameter was selected by customers' desire. Finally, the analog PID controller's circuit was assembled from the control law. The circuit's availability was confirmed by step response test in the controlled system.