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극배치 제어기법을 이용한 자기부상열차용 전원장치에 관한 연구
정춘병(C. B. Chung),이상현(S. H. Lee),김은기(E. K. Kim),조정민(J. M. Jo),전기영(K. Y. Jeon),강승욱(S. O. Kang),김용주(Y. J. Kim),한경희(K. H. Han) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
When the magnetic levitation system(MAGLEV) initially rise, The MAGLEV has a weak point that is very large variation of the electric current. In this paper, The author applied the multi-loop-control to stably control the magnetic levitation system(MAGLEV). The gains of the control algorithm were selected based on pole locations formulated from a prototype Bessel transfer function model. The design incorporate tradeoffs in DC-to-DC converter hard-ware para -meters and pole locations. In order to confirm the superiority of the proposed pole selection and controller, MATLAB simulation and experiment results are presented.
이재훈(J. H Lee),신철준(C. J. Shin),전기영(K. Y. Jeon),박춘우(C. W. Bak),전지용(J. Y. Chun),이상집(S. C. Lee),오봉환(B. H. Oh),정춘병(C. B. Chung),한경희(K. H. Han) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
There is an application which uses smoothing reacter connecting each of the phases in order to make the system smaller comparison with an application using the insulating transformer in the utility interactive photovoltaic generation system using the PWM converter. In this case, there might be the occurence of the unbalance of output voltage, by the difference of smoothing reactor, connected on each of the lines. Therefore this study proposes that the method which maintains the balance and compensates the unblance which occured by the different volume of the smoothing reactor connected on each of the lines.
신철준(C. J Sin),전기영(K. Y. Jeon),이승환(S. H. Lee),강승욱(S. U. Kang),오봉환(B. H. Oh),정춘병(C. B. Chung),이훈구(H. G. Lee),한경희(K. H. Han) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
In this paper, The authors study the boost Regulator as a DC-DC Converter like a power supply and describe the investigation result about the two phase with combined boost regulator which has the same effect that the switching frequency of the solid-state-switch is two times. As a result, the ripple of the input current and output current is better improved.
김대균(D.G. Kim),정정훈(J.H. Chung),정춘병(C.B. Chung),김성남(S.N. Kim),이승환(S.H Lee),강승욱(S.W. Kang),오봉환(B.H. Oh),이훈구(H.G. Lee),김용주(Y.J. Kim),한경희(K.H. Han) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
Since the residential load is an AC load and the output of solar cell is a DC power, the photovoltaic system needs the DC/AC converter to utilize solar cell. In case of driving to interact with utility line, in order to operate at unity power factor, converter must provide the sinusoidal wave current and voltage with same phase of utility line. Since output of solar cell is greatly fluctuated by insolation, it is necessary that the operation of solar cell output in the range of the vicinity of maximum power point. In this paper, DC/AC converter is three phase PWM converter with smoothing reactor. And then, feedforward control used to obtain a superior characteristic for current control and digital PLL circuit used to detect the phase of utility line.
모델기준적응시스템(MRAS) 기반의 부하토크관측기를 이용한 유도전동기 속도제어
김은기(E. G. Kim),이훈구(H. G. Lee),이승환(S. H. Lee),오봉환(B. H. Oh),정춘병(C. B. Chung),함년근(N. G. Hahm),전기영(K. Y. Jeon),이상현(S. H. Lee),한경희(K. H. Han) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper investigates a speed sensorless control of induction motor. The control strategy is based on MRAS (Model Reference Adaptive System) using load-torque observer as a reference model for flux estimation. The speed response of conventional MRAS controller characteristics is affected by variations of load torque disturbance. In the proposed system, the speed control characteristics using a load-torque observer control isn't affected by a load torque disturbance. Simulation results are presented to prove the effectiveness of the adaptive sliding mode controller for the drive variable toad of induction motor.