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동작조건에 따른 불확실성의 변화를 고려한 전력계통 안정화 장치 설계
金洪必 慶一大學校 1999 論文集 Vol.16 No.5
This paper deals with design of power system tabilizers considering the variation of the uncertainty with respect to operating conditions. In genera the uncertaity to be considered for the design of a PSS seems to be too conservative, so the overall control system used to experience unnecesarily excessie input magnitude and system degree. If the uncertainty is modelled as as function of parameters Κ₁- Κ? we can identify drastically changing ones with respect to various operating conditions. These parameters become a part of worst uncertainty for which a PSS is smaller input magnitude and lower system degree than with a conventional PSS.
金洪必 慶一大學校 1999 論文集 Vol.16 No.2
This paper deals with uncertainty of the power system with varying operating conditions. It is assumed that the uncertainty is characterized by the parameters K₁∼K?? of the system matrix of a norminal model. These parameters is identified by an adaptive observer under various conditions. The computer simulation results show that some parameters reveal drastic change compared to the others. This property will be used to estimate the location and the extent of system faults and to design a reduced order PSS.
비모형화특성과 외란에 대해 강인한 직접 적응제어기 설계에 관한 연구
金洪必 慶一大學校 1990 論文集 Vol.6 No.1
This paper presents a robust direct adaptive controller with respect to unmodelled dynamics and bounded disturbances. In this algorithm a new term, proportional to the product of the tracking error and normalizing signal, is added to the conventional control input. It is shown that the performance of the adaptive control system is improved. Only the scalar case is discussed.
비모형화 특성과 외란이 있는 1차 계통의 기준 모델 강인 제어
金洪必 慶一大學校 1995 論文集 Vol.12 No.2
This paper proposes a design method of model reference robust controllers for a first order plant with unmodelled dynamics and bounded disturbances. The new controller requires the signal proportional to the product of the tracking error and normalizing signal, and no parameter adaptation law. The validity of the proposed method is shown by some simulation results.
브러시리스 DC모터의 속도측정치를 필요로 하지 않는 백스테핑 추적 제어기 설계
김홍필 경일대학교 산업기술연구소 1999 産業技術硏究所 論文集 Vol.6 No.-
This paper presents an adaptive tracking controller for a brushless DC(BLDC) motor driving a single-link manipulator without velocity measurements. Using the observed backstepping approach, a globally exponential stability(GES) result is obtained for the rotor position and the velocity tracking errors. Simulation results are presented to validate the performance of the proposed controller.
盧澈均,裵英鎬,金洪必 慶一大學校 1991 論文集 Vol.7 No.1
This paper presents a new adaptive control algorithm which is robust with respect to unmodeled dynamics and bounded disturbances. In this algorithm the control law is augmented with a term proportional to the product of output error and the normalizing signal, but the adaptive law is the conventional one used to control the system without unmodeled dynamics and bounded disturbances. The boundedness of parameter estimates and the other signals in the overall system will be proved, and some simulation results are presented.
金洪必 慶一大學校 1993 論文集 Vol.9 No.1
This paper proposes a stable indirect adaptive control method for unknown linear time-invariant first-order plants. When the estimated plant is uncontrollable the calculated parameters, instead of the parameter estimates, are used to synthesize the control input. And this algorithm does not require the sign of the high frequency gain and the knowledge of a lower bound on the high frequency gain.
金洪必 慶一大學校 1996 論文集 Vol.13 No.2
This paper proposes a design method of model reference robust controllers for a first order plant with unmodelled dynamics and bounded disturbances. The new control law is composed of the conventional control law and a signal proportional to the product of the tracking error and the normalizing signal. No parameter adaptation law is necessary in this algorithm. The validity of the proposed method is shown by some simulation results.
출력 피이드백을 통한 유도전동기 속도 제어기 설계에 관한 연구
金洪必 慶一大學校 1997 論文集 Vol.14 No.2
In the design of nonlinear control systems , separation principle does not hold. Moreover even an exponentially decaying disturbances can destabilize a nonlinear system and lead to finite escape time from certain initial conditions. So in the output feedback cases we consider the effects of observation error. We introduce the two methods to counteract the effects of observation error : nonlinear damping terms and interlaced controller-observer design. Then we present a output feedback speed controller for induction motors which is designed to minimize the effects of observation error using the interlaced controller-observer design method and an integrator backstepping mehod. Simulation results show that the proposed controller has desired performance like other complex controllers.